GE Kelman DGA900 Manual

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 1 of 92
GE
Grid Solutions
Kelman™ DGA 900
Operator Guide
Transformer Oil
Dissolved Gas and Moisture Monitor

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 2 of 92
Contents
Page
1Introduction............................................................................................... 7
1.1 Product Overview ................................................................................................................................7
1.2 Scope ........................................................................................................................................................9
1.3 Front Panel LEDs ..................................................................................................................................9
2Safety........................................................................................................10
2.1 Symbols................................................................................................................................................. 10
2.2 Warnings .............................................................................................................................................. 10
2.3 Hazardous Substances ................................................................................................................... 11
3Technical Specifications .........................................................................12
4Compliance ..............................................................................................14
5Power........................................................................................................15
6HMI............................................................................................................16
6.1 Introduction......................................................................................................................................... 16
6.2 Connections ........................................................................................................................................ 17
6.3 Start-Up Procedure .......................................................................................................................... 18
6.4 Login....................................................................................................................................................... 18
6.5 Dashboard............................................................................................................................................ 19
6.5.1 Quick Access................................................................................................................................................................. 21
6.6 GAS / Diagnostics.............................................................................................................................. 23
6.6.1 Active Alarms ...............................................................................................................................................................23
6.6.2 Measurements.............................................................................................................................................................23
6.6.3 Duval Triangle ..............................................................................................................................................................24
6.6.4 Gas Ratio ........................................................................................................................................................................25
6.6.5 Scheduler ....................................................................................................................................................................... 26
6.7 Calculations......................................................................................................................................... 26
6.7.1 Gas Ratios......................................................................................................................................................................26
6.7.2 Relative Saturation....................................................................................................................................................27
6.7.3 Gas Rate of Change ................................................................................................................................................... 27
6.7.4 Analog Inputs RoC Configuration .......................................................................................................................28
6.8 Alarms ................................................................................................................................................... 29
6.8.1 Gases................................................................................................................................................................................ 29
6.8.2 Gas Ratios......................................................................................................................................................................30
6.8.3 Gas Rate of Change ................................................................................................................................................... 31
6.8.4 Relative Saturation....................................................................................................................................................32
6.8.5 Analog Inputs ............................................................................................................................................................... 32
6.8.6 Analog Inputs Rate of Change..............................................................................................................................33
6.8.7 Digital Inputs ................................................................................................................................................................33
6.8.8 Digital Inputs Transition Total..............................................................................................................................34
6.9 Peripherals........................................................................................................................................... 35
6.9.1 Peripheral Scheduler ................................................................................................................................................ 35
6.9.2 Analog Inputs ............................................................................................................................................................... 35
6.9.3 Digital Inputs ................................................................................................................................................................36
6.9.4 Input Measurements ................................................................................................................................................ 36
6.10 Settings ................................................................................................................................................. 37
6.10.1 Communications ........................................................................................................................................................37
6.10.2 Date & Time ..................................................................................................................................................................38

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 3 of 92
6.10.3 SMS Alerting.................................................................................................................................................................. 38
6.10.4 Firewall............................................................................................................................................................................39
6.10.5 Communication Services........................................................................................................................................40
6.11 Service ................................................................................................................................................... 41
6.11.1 Measurement...............................................................................................................................................................41
6.11.2 Controller Reprogramming.................................................................................................................................... 42
6.11.3 I/O PCB Reprogramming .........................................................................................................................................43
6.11.4 Oxygen Sensor.............................................................................................................................................................44
6.11.5 Gas Normalization ..................................................................................................................................................... 45
6.11.6 Factory............................................................................................................................................................................. 45
6.11.7 User Administration..................................................................................................................................................48
6.12 TransOpto ............................................................................................................................................ 50
6.12.1 Measurements.............................................................................................................................................................50
6.12.2 Rate of Change ............................................................................................................................................................ 50
6.12.3 Alarms..............................................................................................................................................................................51
6.12.4 Rate of Change Alarms ............................................................................................................................................ 52
6.12.5 Channels.........................................................................................................................................................................53
6.12.6 Settings ........................................................................................................................................................................... 53
6.13 Logout.................................................................................................................................................... 54
6.14 Shutdown Procedure....................................................................................................................... 55
6.15 Error Notifications ............................................................................................................................ 56
6.15.1 Error Codes....................................................................................................................................................................58
6.15.2 Other Notifications.................................................................................................................................................... 59
7Manual Oil Sampling ...............................................................................60
7.1 Sampling Arrangement................................................................................................................... 60
7.2 Local HMI for manual sampling ................................................................................................... 61
7.3 Sampling Process.............................................................................................................................. 65
8Communications .....................................................................................67
8.1 DNP3 ...................................................................................................................................................... 67
8.2 IEC 61850 ............................................................................................................................................. 67
8.3 Modbus Protocol ............................................................................................................................... 67
8.4 HTTP / HTTPS Protocol.................................................................................................................... 67
9Technical Support ...................................................................................67
Appendix A Security Configuration............................................................68
Appendix B Transportation PGA Lock........................................................75
Appendix C Maintenance Activities ...........................................................79
Appendix D Time Sync Implementation.....................................................85
Appendix E Alarm Settings: General Advice .............................................87
Contact & Copyright Details ..........................................................................92

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 4 of 92
List of Tables and Figures
Page
Figure 1-1: Inside the DGA 900 ................................................................................................................................................7
Table 1-1: Hub front panel LED lights ...................................................................................................................................9
Table 3-1: Measurements........................................................................................................................................................ 12
Table 4-1: Type tests .................................................................................................................................................................. 14
Figure 5-1: Fuse holder ............................................................................................................................................................. 15
Table 5-1: External LED status indicators ........................................................................................................................ 15
Figure 6-1: Inside the Hub –LCD top left.......................................................................................................................... 16
Figure 6-2: Ethernet / USB HMI connection .................................................................................................................... 17
Figure 6-3: Log-in page............................................................................................................................................................. 18
Table 6-1: User access rights................................................................................................................................................. 18
Figure 6-4: Local HMI: Quick Access page....................................................................................................................... 19
Figure 6-5: Dashboard .............................................................................................................................................................. 20
Figure 6-6: Quick Access.......................................................................................................................................................... 21
Figure 6-7: Quick Access –Rapid Mode............................................................................................................................ 22
Figure 6-8: Active Alarms......................................................................................................................................................... 23
Figure 6-9: Measurements...................................................................................................................................................... 24
Figure 6-10: Duval Diagnostic ............................................................................................................................................... 25
Figure 6-11: Gas Ratio............................................................................................................................................................... 25
Figure 6-12: DGA Scheduler ................................................................................................................................................... 26
Figure 6-13: Gas Ratio Settings............................................................................................................................................. 26
Figure 6-14: Gas Ratio Settings –Ratio 1 definition.................................................................................................... 26
Figure 6-15: Relative Saturation Settings ........................................................................................................................ 27
Figure 6-16: Gas RoC Configuration................................................................................................................................... 27
Figure 6-17: Analog Inputs Rate of Change Configuration..................................................................................... 28
Figure 6-18: Gas Alarms Configuration............................................................................................................................. 29
Figure 6-19: Hydrogen alerts................................................................................................................................................. 30
Figure 6-20: Gas Ratio Alarms Configuration ................................................................................................................ 30
Figure 6-21: Gas Ratio Alarms Configuration –Ratio 1 High-High Gas Rate of Change.......................... 30
Figure 6-22: Gas RoC Configuration................................................................................................................................... 31
Figure 6-23: Relative Saturation Alarms Configuration ............................................................................................ 32
Figure 6-24: Relative Saturation Alarms Configuration –High-High.................................................................. 32
Figure 6-25: Analog Inputs Alarms Configuration ....................................................................................................... 32
Figure 6-26: Analog Inputs RoC Alarms Configuration.............................................................................................. 33
Figure 6-27: Digital Inputs Alarms Configuration......................................................................................................... 33
Figure 6-28: Digital Inputs Transition Total Alarms Configuration ...................................................................... 34
Figure 6-29: Peripheral Scheduler....................................................................................................................................... 35
Figure 6-30: Analog Inputs Configuration ....................................................................................................................... 35
Figure 6-31: Analog Input 4 (4-20 mA Temperature Sensor).................................................................................. 36
Figure 6-32: Digital Input Configuration........................................................................................................................... 36
Figure 6-33: Input Measurements....................................................................................................................................... 36
Figure 6-34: Communications Settings............................................................................................................................. 37
Figure 6-35: Date & Time ......................................................................................................................................................... 38
Figure 6-36: SMS Alerting......................................................................................................................................................... 38
Figure 6-37: Firewall configuration..................................................................................................................................... 39
Figure 6-38: Communication Services .............................................................................................................................. 40
Figure 6-39: Measurement Settings ................................................................................................................................... 41
Figure 6-40: Controller Reprogramming.......................................................................................................................... 42
Figure 6-41: Upgrade in progress........................................................................................................................................ 42
Figure 6-42: I/O Board Reprogramming........................................................................................................................... 43
Figure 6-43: Upgrade in progress........................................................................................................................................ 43
Figure 6-44: Oxygen Sensor ................................................................................................................................................... 44

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 5 of 92
Figure 6-45: Gas Normalization Settings ......................................................................................................................... 45
Figure 6-46: Factory Settings................................................................................................................................................. 45
Table 6-2: Factory Settings: Data and configuration cleardown ......................................................................... 47
Figure 6-47: Simulation mode ............................................................................................................................................... 48
Figure 6-48: Restart the device............................................................................................................................................. 48
Figure 6-49: User Administration......................................................................................................................................... 48
Figure 6-50: Change Password............................................................................................................................................. 49
Table 6-3: Password Strength ............................................................................................................................................... 49
Figure 6-51: TransOpto Measurements............................................................................................................................ 50
Figure 6-52: TransOpto RoC Configuration..................................................................................................................... 50
Figure 6-53: TransOpto Alarms Configuration .............................................................................................................. 51
Figure 6-54: Channel 1 High alerts...................................................................................................................................... 51
Figure 6-55: TransOpto RoC Alarms Configuration..................................................................................................... 52
Figure 6-56: Channel 2 High-High alerts.......................................................................................................................... 52
Figure 6-57: TransOpto Channels Settings...................................................................................................................... 53
Figure 6-58: TransOpto Settings........................................................................................................................................... 53
Figure 6-59: Logout .................................................................................................................................................................... 54
Figure 6-60: Log-in page.......................................................................................................................................................... 54
Figure 6-61: System Info –Standby.................................................................................................................................... 55
Figure 6-62: Measurement started..................................................................................................................................... 55
Figure 6-63: PGA and Oxygen Sensor Error States ..................................................................................................... 56
Figure 6-64: PGA Errors............................................................................................................................................................. 57
Table 6-4: PGA Errors ................................................................................................................................................................. 58
Table 6-5: Oxygen sensor error codes .............................................................................................................................. 59
Figure 65: MicroSD card memory usage.......................................................................................................................... 59
Figure 7-1: Oil filter and oil ports (front view of Analysis module)........................................................................ 60
Figure 7-2: Valve orientation.................................................................................................................................................. 61
Figure 7-3: Sampling assembly............................................................................................................................................. 61
Figure 7-4: Luer fitting on assembly................................................................................................................................... 61
Figure 7-5: Local HMI: Quick Access................................................................................................................................... 61
Figure 7-6: Manual Sampling................................................................................................................................................. 62
Figure 7-7: Purging Oil............................................................................................................................................................... 62
Figure 7-8: Take manual oil sample ................................................................................................................................... 63
Figure 7-9: Manual Sampling cannot be started ......................................................................................................... 63
Figure 7-10: Dashboard: Stop Measurement................................................................................................................. 64
Figure 7-11: Manual oil sampling flowchart................................................................................................................... 65
Table A-1: External Interfaces................................................................................................................................................ 69
Table A-2: Protocols.................................................................................................................................................................... 69
Figure A-1: Settings > Communication Services........................................................................................................... 70
Figure A-2: Communication Services................................................................................................................................. 70
Figure A-3: Firewall Settings................................................................................................................................................... 72
Figure A-4: Default policy options........................................................................................................................................ 73
Figure A-5: Specific policy options....................................................................................................................................... 73
Figure A-6: LAN interface......................................................................................................................................................... 73
Figure A-7: LAN interface......................................................................................................................................................... 73
Figure A-8: Accept HTTPS ........................................................................................................................................................ 74
Figure B-1: PGA lock –engaged ........................................................................................................................................... 75
Figure B-2: PGA lock –pins and locking bracket secured with cable ties........................................................ 75
Figure B-3: PGA lock –remove pins.................................................................................................................................... 76
Figure B-4: PGA lock –remove plastic nuts .................................................................................................................... 76
Figure B-5: PGA lock –remove metal bracket............................................................................................................... 76
Figure B-6: PGA lock –insert metal bracket ................................................................................................................... 77
Figure B-7: PGA lock –attach plastic nuts....................................................................................................................... 77
Figure B-8: PGA lock –insert pins ........................................................................................................................................ 77

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Figure B-9: PGA lock –pin to enclosure hole.................................................................................................................. 78
Figure B-10: PGA lock –pins and locking bracket secured with cable ties ..................................................... 78
Figure C-1: Controller PCB coin cell battery.................................................................................................................... 79
Figure C-2: Marshalling PCB coin cell battery................................................................................................................ 79
Figure C-3: Hub fan air inlet.................................................................................................................................................... 80
Figure C-4: Detached inlet cover with filter –facedown .......................................................................................... 80
Figure C-5: Detached inlet cover with filter removed ................................................................................................ 80
Figure C-6: Filter mesh cartridge –face up..................................................................................................................... 80
Figure C-7: Louvre catchment tray –attached............................................................................................................. 81
Figure C-8: Louvre gasket –tray removed...................................................................................................................... 81
Figure C-9: Louvre catchment tray –detached & filter removed ........................................................................ 81
Figure C-10: Louvre air filter................................................................................................................................................... 81
Figure C-11: Oil connections .................................................................................................................................................. 82
Figure C-12: Oil filter................................................................................................................................................................... 82
Figure C-13: Internal push-fit cover removal................................................................................................................. 82
Figure C-14: Peltier cooler ....................................................................................................................................................... 84
Figure C-15: Fan group electrical connection ............................................................................................................... 84
Figure C-16: Peltier cooling fins ............................................................................................................................................ 84
Figure C-17: Fan group detached from cooler.............................................................................................................. 84
Table D-1: Timing......................................................................................................................................................................... 85
Table D-2: UNIX time registers .............................................................................................................................................. 85
Table D-3: Access flags............................................................................................................................................................. 86
Table D-4: Modifier flags .......................................................................................................................................................... 86
Table E-1: Main Tank: Gas Level Alarms ........................................................................................................................... 88
Table E-2: ROC alarms (key gas values) ............................................................................................................................ 88
Table E-3: ROC alarms (for ROC in ml/day)...................................................................................................................... 90
Table E-4: Measurement intervals....................................................................................................................................... 90
Related Documents
Ref#
Title
MA-024
DGA 900 Installation Manual
Abbreviations & Definitions
Abbreviation
Meaning
HMI
Human Machine Interface
Controller PCB
Controller Printed Circuit Board
I/O PCB
Input / Output Printed Circuit Board
Marshalling PCB
Marshalling Printed Circuit Board
PPE
Personal Protective Equipment
PCC
Power, Communications and Control (cable)
RoC
Rate of Change

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 7 of 92
1INTRODUCTION
1.1 Product Overview
The Kelman™ DGA 900 (the product) is a multigas online DGA (Dissolved Gas Analysis) and
moisture monitoring system for implementing Asset Performance Management (APM)
across electrical generation, transmission, distribution and industrial applications.
The product as shown in Figure 1-1 can detect and diagnose incipient faults and trend
asset health via the monitoring of critical gases including moisture in the transformer oil.
This includes any mineral oil or ester-based fluid (natural or synthetic). The product
measures nine certified fault gases: hydrogen, methane, ethane, ethylene, carbon
monoxide, carbon dioxide, acetylene, oxygen, nitrogen as well as water content and the
transformer load current. Such data provides insight on transformer condition criteria,
such as developing faults, paper degradation and electrical arcing.
Once installed, operation is intuitive and programmable. The product can be managed
remotely over a network via a web-based interface or locally via a touchscreen interface.
All results are stored within the product, but online management is recommended. Results
and the full product database can also be downloaded to a PC for analysis, aggregation and
trending with the Perception software suite.
Figure 1-1: Inside the DGA 900
The product features:
▪An innovative two-enclosure design connecting the two modules by a Power,
Communications and Control (PCC) cable for a more flexible installation configuration.
The Analysis module contains the PGA measurement technology, whereas the Hub
module contains the communications technology and HMI screen. The modules have
IP56-rated aluminium enclosures (compliant in the installed upright position) and are
powder coated to the RAL 9002 colour.
▪Automated headspace gas extraction manifold to extract target gases from the oil
sample.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 8 of 92
▪Advanced high precision Photo-Acoustic Spectroscopy (PAS) sensing technology based
on a robust multi-point individual gas calibration process using certified gases to
calibrate the PGA (Photoacoustic Gas Analyser).
▪Complete multi-gas analysis (nine gases and moisture) with a user-configurable
sampling frequency from once per hour to once every four weeks including remote alert
capabilities. All gas sensing is carried out internally without a need for carrier gases or
recalibration. Minimal maintenance*1 and no requirement for costly consumables.
▪A new ‘Rapid Mode’ allows sampling to be completed in around 30 minutes using five
key gases and is useful in critical situations to give immediate insight on fast-developing
faults.
▪Improved lower detection limits and measurement repeatability for earlier detection of
imminent faults on the transformer being monitored.
▪Transformer load tracking (CT analogue input as standard).
▪Watchdog relay as standard to monitor power usage.
▪Six configurable relay contacts based on absolute gas and moisture values (with one
dedicated service).
▪Five optional 4-20 mA configurable analogue input cards.
▪Three digital inputs (optional configurations available).
▪Compatible with AC or DC power.
▪Four sunlight-visible LED arrays on the exterior of the Hub module —red for alarm,
yellow for caution (both user-configurable) —and green for power, blue for service.
▪A fully embedded microprocessor with 4 GB non-volatile internal memory storage,
highly scalable analogue and digital I/Os, an embedded webserver, 8 GB SD card to hold
measurement data and an integrated 7 in. colour LCD screen with resistive touch for
simplified local user interaction and visualization of data.
▪The infrastructure provides a platform for expansion and future feature enhancements
complemented by an extensive range of secure communications options. These include
Ethernet, RS-485, cellular modem (SMS Text Alerts /GPRS), and fibre optic options
(IEC61850 or DNP3). Internal USB connection is provided for commissioning and service,
or local data download. Other options may be available on request.
▪Compatibility with GE’s Perception transformer fleet management software for data
download, trending and analysis as well as other SCADA systems. The product is a DS-
Agile and Predix-Grid APM ready device with support for industry standard protocols.
*1 Note: The only recommended maintenance is periodic cleaning of the air filters, in-line
oil filter and battery replacement.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 9 of 92
1.2 Scope
This guide outlines the use of the HMI, manual sampling function and general maintenance
activities.
1.3 Front Panel LEDs
Table 1-1 outlines the LEDs on the front panel of the Hub module.
Table 1-1: Hub front panel LED lights
LED Colour
Symbol
Meaning
Alarm
A measured parameter has exceeded a user-programmed
“alarm” threshold.
Caution
A measured parameter has exceeded a user-programmed
“warning” threshold.
Power
24 V Power OK.
Service
Service required. Triggered by a warning service event if the
product detects internal issues or if equipment settings are
exceeded. If scheduled, the product will still attempt another
measurement and clear any service condition if the issue is no
longer present.

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2SAFETY
2.1 Symbols
The meaning of symbols used on the Kelman™ DGA 900:
Caution. Refer to the Installation Manual / Operator Guide to prevent death,
bodily injury, equipment damage or loss of data.
Electrical Hazard. Risk of electric shock.
Primary Protective Earth connection.
Hot surfaces may be present.
The meaning of symbols used in this guide:
Warning: A procedure, practice, or condition could cause death or serious
injury and/or significant equipment damage.
[Caution]: A procedure, practice, or condition could cause minor injury,
equipment damage or loss of data.
Electrical Hazard: Risk of electric shock.
Hot surfaces may be present.
2.2 Warnings
The following warnings must be observed:
WARNING: The minimum ambient temperature for installation and service
activities is −10 °C.
WARNING: If the equipment is installed or used in a manner not specified by
the manufacturer, the protection provided by the equipment may be
impaired.
WARNING: If working at height, third parties must have received appropriate
training for working at height prior to work commencing. This includes, but is

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 11 of 92
not limited to, ‘Working at height’ and ‘Using Mobile Elevated Working
Platforms’ training.
WARNING: If working at a height greater than 4 feet (1.2 metres) or at a
height greater than that stipulated by national or site regulatory
requirements, it is the responsibility of the installer to ensure that planned
work complies with those requirements.
WARNING: The user shall also ensure that any third-party equipment, such
as an approved platform, scaffold or lift is suitable and safe before
commencing work. Ladders or improvised platforms do not meet GE service
engineer requirements.
WARNING: Once installed, this product may have more than one source of
supply. Disconnect all supplies at their source before accessing the cabinet
for servicing. Follow the site lockout-tagout (LOTO) procedure.
WARNING: Disconnection from the supply is achieved through the external
circuit breaker or switch.
WARNING: Ensure all power sources, including relays, are de-energised as
stipulated by lockout-tagout (LOTO) requirements before performing any
maintenance work inside the product.
WARNING: The product is operated with the door shut under normal use.
The door shall be kept locked and should only be opened for service access by
suitably qualified and authorised service personnel. During service access,
hazardous voltages are accessible.
WARNING: Only GE-trained and certified personnel may commission GE
Kelman products. Commissioning tasks include making any connections
and/or performing any work within the enclosure, or performing tasks such
as purging the oil circuit between the transformer and the product, and/or all
first start-up procedures relating to equipment or firmware/software.
WARNING: The product provides IP56 water spray protection. It is possible
for a water deluge system to exceed IP56 thresholds depending on the
location, pressure and direction of the water jets. Should customers require
testing a water deluge system in the area in which the product is installed, GE
recommends powering down the product and draping it with a suitable
waterproof covering.
2.3 Hazardous Substances
The gases measured in the product are extracted from the oil and expelled to the
atmosphere via the exhaust vent on the external base of the Analysis module. The area
around the exhaust vent should be kept clear and unobstructed. All expelled gases are at
concentrations that are nonflammable, nontoxic and quickly diluted in the surrounding
atmosphere. The expelled gases are not hazardous to health or life.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 12 of 92
3TECHNICAL SPECIFICATIONS
The product meets the following technical specification as outlined in Table 3-1.
Table 3-1: Measurements
PARAMETER
VALUE/MEETS
GAS MEASURED *1 & 10
RANGE
ACCURACY *2 & 3
REPEATABILITY
*2
Hydrogen (H2)
5 –5,000 ppm
± 5% or ± LDL
<3%
Methane (CH4)
2 –50,000 ppm
± 3% or ± LD L
<2%
Ethane (C2H6)
1 –50,000 ppm
± 3% or ± LDL
<2%
Ethylene (C2H4)
1 –50,000 ppm
± 3% or ± LDL
<2%
Acetylene (C2H2)
0.5 –50,000 ppm
± 3% or ± LDL
<2%
Carbon Monoxide (CO)
1 –50,000 ppm
± 3% or ± LDL
<2%
Carbon Dioxide (CO2)
20 –50,000 ppm
± 3% or ± LDL
<3%
Oxygen (O2)
100 –50,000 ppm
± 5% or ± LDL
<3%
Nitrogen (N2) *4
10,000 –100,000 ppm
± 15% or ± LDL
<3%
Moisture (H2O)
0 –100% Relative
Saturation *5
± 3.5%
<3%
Measurement frequency
Variable –Once per hour to once every 4 weeks
ENVIRONMENTAL*11
Operating external
temperature range
−40 °C to 55 °C
Storage temperature range
0 °C to 45 °C
Oil temperature range *6
−20 °C to 120 °C
Altitude
Up to 2000 m
Atmospheric pressure
Up to 1050 mbar
Operating humidity
10 –95% RH non-condensing
Enclosure
IP56
Weight *7
Analysis module: 33.4 kg (73.6 lb)
Hub module: 18.5 kg (40.8 lb)
2 m PCC cable: 0.8 kg (1.83 lb)
Product weight: 52.7 kg (116.3 lb)
POWER REQUIREMENTS
Nominal input voltage range:
100-250 V DC 4 A
100-240 V AC, 50/60 Hz, 4 A
Input voltage range:
90-264 V AC
90-275 V DC
AC frequency range:
45-65 Hz
Single phase Alarm Relays:
NO and NC provided*8
10 A 250 V AC, 10 A 30 V DC, 0.3 A 110 V DC, 0.12 A 220 V DC
Fuses *9
10 A 600 V AC/DC EATON KLM-10
Coin cells
Panasonic CR2450 3 V 620 mAh
*1 Note: Parameters specified in application with mineral oil.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 13 of 92
*2 Note: Accuracy and repeatability are quoted for the detectors under factory calibration
and test levels. Gas-in-oil measurements may be affected by sampling and/or oil
type.
*3 Note: Whichever is greater.
*4 Note: Available on free-breathing transformers only.
*5 Note: Given in ppm.
*6 Note: Based on testing carried out using VOLTESSO™ 35 mineral oil over a ¼ in. pipe
run of 10 metres or less from oil supply or return valve to product connection
point, and on transformer oil supply valve volumes of 200 ml or less. For oil
temperatures colder than −20 ºC, GE recommends the use of heat trace cabling
on piping. Low oil viscosity reduces oil flow.
*7 Note: The weight depends on the order specification. The stated weight is for a base
product without packaging and excludes options such as a mounting stand.
Check the shipping document for the exact packaged weight.
*8 Note: Maximum DC breaking capacity for a resistive load.
*9 Note: Use only the approved and recommended fuse to ensure continued fire
protection and compliance.
*10 Note: Laboratory results can vary greatly worldwide as has been established through
many round-robin tests. Any comparison of DGA 900 measurement results
against laboratory results need to be considered in this context.
*11 Note: It is possible for a small amount of condensation to form on the inner surface of
the Analysis enclosure. This occurs under certain environmental conditions and
does not affect the performance or reliability of the product.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 14 of 92
4COMPLIANCE
The product is designed to meet the following type tests as listed in Table 4-1.
Table 4-1: Type tests
CATEGORY
STANDARD
CLASS/LEVEL
TEST
EMC Emissions
EN 61326-
1:2006
CISPR 11
A
Radiated & Conducted Emissions
FCC Part 15
Meets the
requirements of A
Radiated & Conducted Emissions
EN 61000-3-2
A
Harmonic Current Emissions
Limits
EMC Immunity
EN 61326-
1:2006
IEC 61000-6-5:
2015
EN 61000-4-2
IV
Electrostatic Discharge
EN 61000-4-3
III
Electromagnetic Field Immunity
EN 61000-4-4
III
Electrical Fast Transients
EN 61000-4-5
III
Surge Immunity
EN 61000-4-6
III
Conducted RF Immunity
EN 61000-4-8
IV & V
Magnetic Field Immunity
EN 61000-4-11
III
Voltage Dips & Interruptions
IEC 61000-4-12
2.5 kV & 1 kV
Oscillatory Wave
IEC 61000-4-16
A
Mains frequency voltage
EN 60255-5
5 kV, 2 kV &
500 V DC
Impulse, Dielectric & Insulation
resistance testing
Environmental
IEC 60068-2-1
−40 °C
Cold
IEC 60068-2-2
55 °C
Dry Heat
IEC 60068-2-6
10 –500 Hz,
0.5 g operation
10 –500 Hz,
1 g endurance
Vibration
IEC 60068-2-30
55 °C, 95% RH
Damp Heat
EN 60529
IP56
Degree of Protection
Safety
IEC 61010-1
2010
EN 61010-1
2010

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 15 of 92
5POWER
The product is wired directly to the mains so is continually powered on. The mains fuse
holder for the product is shown in Figure 5-1 and is located towards the bottom right-hand
side of the Hub module.
Figure 5-1: Fuse holder
The product uses four external sunlight-visible LEDs on the front door. Each LED has two
states –‘Off’ (-) or ‘On’ as outlined in Table 5-1.
Table 5-1: External LED status indicators
Mode
Alarm
red LED
Caution
amber LED
Power
green LED
Service
blue LED
Power Off
-
-
-
-
Normal
-
-
On
-
Alarm
On
-
On
-
Caution
-
On
On
-
Service
-
-
On
On
Fuse holder
Live
Neutral
Earth

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 16 of 92
6HMI
6.1 Introduction
The local HMI features an integrated 7 in. colour LCD panel with resistive touch screen and
embedded webserver. The remote HMI is via a wireless comms option (or direct USB
connection) to a web browser. The latter being the preferred means of interaction with the
product since it offers the convenience of accessing the product from anywhere using a full
screen web browser. The remote HMI is optimised for Chrome, but has also been tested in
Chrome, Firefox and Internet Explorer. The local HMI allows operators to interact directly
with the product onsite without additional equipment. However, the local HMI facility is
intended as an alternative or secondary access method in situations where network
connectivity is unavailable.
To prevent exposure of the internal equipment to extreme weather or other
adverse environmental conditions, ensure additional cover is in place prior to
opening the door.
The LCD panel is in the Hub module and is visible when the door is open as shown in Figure
6-1.
Figure 6-1: Inside the Hub –LCD top left
The LCD and web server are powered on by default as soon as power is supplied to the
product. Access to the HMI can be gained locally via the resistive touch screen (using a
finger or stylus) or remotely through the Web from any computer. Both HMI experiences
are comparable with a similar look and feel.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 17 of 92
Note: This guide uses screenshots from the remote Web access HMI. The images
rendered on the local HMI are similar, but some have a different layout due to the
smaller screen.
Note: This guide displays screens from an Administrator login. All user logins have a
similar look and feel, but some features are dependent on the type of user.
Note: If there are any rendering issues on the remote HMI, press Ctrl + F5 to refresh.
Note: If using Internet Explorer 11, ensure that the option for ‘Compatibility View’is
disabled.
6.2 Connections
The remote HMI can also be accessed from a laptop via a direct physical connection to the
product. The product ships with the default IP address as shown in Figure 6-2. Use either
an Ethernet or USB cable to make the connection as shown in Figure 6-2.
Figure 6-2: Ethernet / USB HMI connection

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 18 of 92
6.3 Start-Up Procedure
When the product is powered on or rebooted, the PGA takes several minutes to initialise. If
using the remote access HMI, the icon denotes that the initialization process is not yet
complete.
6.4 Login
The log-in page prompts for a username and password as shown in Figure 6-3. The product
ships with a default username and password that can be changed after initial login.
Figure 6-3: Log-in page
The system supports three roles with different levels of access as outlined in Table 6-1.
Table 6-1: User access rights
Role
Access
Observer
View information only (includes downloading if using the remote HMI)
Operator
View information and make configuration changes.
Administrator
View information, make configuration changes and perform user
administration e.g. change passwords.
Note: The session inactivity timeout is 10 minutes.
The Administrator can omit to set a password for the ‘Observer’ role. This means anyone
with physical access to the product or a connected computer can observe the gas levels
and measurements etc. without the need to supply a password. See Section 6.11.7 for user
administration details.
The opening page of the local HMI presents a Quick Access page as shown in Figure 6-4,
whereas the remote access HMI presents a detailed dashboard as shown in Figure 6-5. The
header on each page shows the signal strength, username and menu bar.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 19 of 92
Figure 6-4: Local HMI: Quick Access page
Note: For manual sampling HMI functionality, see Section 7.2.
6.5 Dashboard
After a successful login, the remote HMI displays the Dashboard page in Normal Mode as
shown in Figure 6-5. The Dashboard page displays details of the Last DGA measurement, a
Quick Access panel, System Information and a trend chart below.
Note: The dashboard can be toggled between Normal Mode and Rapid Mode. See
Section 6.5.1.3.

MA-025 –DGA 900 Operator Guide –Rev 2.0 12-Apr-19 Page 20 of 92
Figure 6-5: Dashboard
The Last DGA Measurement panel shows the measurement date and time stamp, gas
levels (with measurements in PPM) displayed numerically and represented graphically on a
bar chart marked with the configured Caution (H for High) and Alarm (HH for High High)
levels. Blue signifies a reading within the normal limits, yellow a caution —the reading has
exceeded the High (H) level, and red an alarm –the reading has exceeded the High-High
level. Rest the pointer on any gas to obtain the full name in a tooltip. After the next
measurement completes, the details automatically update.
The System Info gives the current date, time, product state, scheduler mode (Normal,
Alarm, Caution) and next scheduled measurement. Indicators show the status of the alarm,
caution and service LEDs as well as the six relays. There is also a free text ID field to assign
a meaningful name to the product. The default is the product’s serial number. Note: Only
Operator or Administrator changes will be saved. The product’s serial and firmware version
numbers are also listed.