GE Intellix BMT 330 User manual

GEDE-GA_M-DLIS-TE.MA-017 Rev 3.3 4-Mar-22
GE
Grid Solutions
Intellix™ BMT 330
Installation Manual
Bushing Monitoring and Partial Discharge
Detection for Transformers

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 2 of 69
Contents
Topic Page
Introduction................................................................................................6
Product Overview....................................................................................................................... 6
Scope.......................................................................................................................................... 6
Abbreviations & Definitions ...................................................................................................... 6
Safety ........................................................................................................7
Symbols...................................................................................................................................... 7
Installer Safety........................................................................................................................... 7
Technical Specifications ..........................................................................8
Measurements........................................................................................................................... 8
Environmental............................................................................................................................ 8
Power ......................................................................................................................................... 8
Type Tests .................................................................................................................................. 9
Pre-Installation.......................................................................................10
Location.................................................................................................................................... 10
Requirements .......................................................................................................................... 10
Base & Access.......................................................................................................................... 11
Communications & Power Cable Runs ................................................................................... 11
Bushing Adaptor Cable Runs .................................................................................................... 11
Installation..............................................................................................13
Mounting .................................................................................................................................. 15
Bushing Adaptor Connections ................................................................................................ 15
High Frequency Current Transformer (HFCT) Connection .................................................... 20
Magnetically-Mounted Temperature Sensors........................................................................ 22
Communications Connections................................................................................................ 25
Cabinet Connections ............................................................................................................... 25
Configuration and commissioning .......................................................................................... 35
Decommissioning .................................................................................................................... 35
Mounting Stand & Sun Hood...................................................37
Parts and Tools List .................................................................41
B.1 GE-supplied items (shipped with the product) ........................................................................ 41
B.2 GE Field Service Engineer (FSE)-supplied items ....................................................................... 42
B.3 Customer-supplied Items ......................................................................................................... 42
Connecting Coaxial Cables.......................................................44
C.1 Routing the Coaxial Cables ....................................................................................................... 44
C.2 Required Materials & Tools...................................................................................................... 44
C.3 Coaxial Cables Preparation....................................................................................................... 45
C.4 Connecting to the Bushing Adaptor ......................................................................................... 45
C.5 Connecting to the Grounding Switch ....................................................................................... 46
C.6 Connecting to the Neutral CT................................................................................................... 47
Bushing Adaptor Circuit Integrity Test Record.........................49
D.1 Required Material..................................................................................................................... 49
D.2 Test Procedure ......................................................................................................................... 49
Communications Module Setup .................................................58
E.1 Network Settings ...................................................................................................................... 58
E.2 EasyConnect software installation ........................................................................................... 59
E.3 Communications module configuration................................................................................... 62

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 3 of 69
Front Panel Lights.......................................................................67
Troubleshooting......................................................................68
Contact & Copyright Details .......................................................................69
List of Figures and Tables
Item Page
Table 1-1: Installation materials............................................................................................................... 6
Table 3-1: Measurements ......................................................................................................................... 8
Table 3-2: Environmental.......................................................................................................................... 8
Table 3-3: Power........................................................................................................................................ 8
Table 3-4: Type Tests ................................................................................................................................ 9
Figure 5-1: General installation layout - single transformer................................................................. 13
Figure 5-2: General installation layout - Bank of 3 single phase transformers.................................... 13
Figure 5-3: Rear side of the product door .............................................................................................. 14
Figure 5-4: Inside the product cabinet ................................................................................................... 14
Figure 5-5: Bushing Adaptor - without top cover .................................................................................. 16
Figure 5-6: Bushing Adaptor - with top cover........................................................................................ 16
Figure 5-7: Bushing Adaptor with cap.................................................................................................... 17
Figure 5-8: Bushing Adaptor with initial threads covered in grease..................................................... 18
Figure 5-9: Bushing Adaptor with all threads covered in grease .......................................................... 18
Figure 5-10: Liquid-tight fitting thread................................................................................................... 19
Figure 5-11: Bushing adaptor terminal block......................................................................................... 19
Figure 5-12: Tightening order ................................................................................................................. 20
Figure 5-13: HFCT cannot be installed if a switch is on cable from the Neutral Bushing to ground... 21
Figure 5-14: HFCT installed on cable from the Neutral Bushing (H0) directly to ground .................... 21
Figure 5-15: Star configuration (Y- Connection).................................................................................... 21
Figure 5-16: HFCT installed after the switch on cable from the Neutral Bushing to ground .............. 22
Figure 5-17: HFCT - example .................................................................................................................. 22
Figure 5-18: MMTS rear view .................................................................................................................. 23
Figure 5-19: MMTS front view................................................................................................................. 23
Figure 5-20: MMTS side view - #1........................................................................................................... 23
Figure 5-21: MMTS #1 with jumper......................................................................................................... 24
Figure 5-22: MMTS #2/3 without jumper ............................................................................................... 24
Figure 5-23: Fibre optic module.............................................................................................................. 25
Figure 5-24: Earth adjacent to the fuse holders .................................................................................... 25
Figure 5-25: Position of primary protective earth bonding lug ............................................................. 26
Figure 5-26: Ambient sensor - raised..................................................................................................... 26
Figure 5-27: Ambient sensor - extended................................................................................................ 26
Figure 5-28: Bushing adaptor connections ............................................................................................ 27
Figure 5-29: PCB phase inputs - Secondary (left), Primary (middle) & Neutral CT (right) ................... 28
Figure 5-30: CANbus Connection on the DIN rail .................................................................................. 29
Figure 5-31: Copper Ethernet ................................................................................................................. 30
Figure 5-32: Fibre optic module.............................................................................................................. 31
Figure 5-33: Fibre optic connections...................................................................................................... 32
Figure 5-34: GPS antenna connection point .......................................................................................... 32
Figure 5-35: Cabinet - external top right - GPS antenna....................................................................... 34
Figure 5-36: Relay board (schematic) .................................................................................................... 34
Figure 5-37: Relay connections (right) and Mains (left) ........................................................................ 34
Table 5-1: Relay connections.................................................................................................................. 35

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 4 of 69
Figure A-1: Upper (or transport) stand .................................................................................................. 37
Figure A-2: Lower stand.......................................................................................................................... 38
Figure A-3: Sun hood............................................................................................................................... 39
Figure A-4: Intellix™ BMT 330 with stand and sun hood attached ....................................................... 40
Table B-1: GE-supplied items ................................................................................................................. 41
Table B-2: GE FSE-supplied items .......................................................................................................... 42
Table B-3: Customer-supplied items...................................................................................................... 42
Table C-1: Required materials ................................................................................................................ 44
Table C-2: Required tools........................................................................................................................ 44
Table C-3: Coaxial cables preparation.................................................................................................... 45
Table C-4: Connecting to the Bushing Adaptor ..................................................................................... 46
Table C-5: Connecting to the grounding switch..................................................................................... 47
Table C-6: Connecting to the Neutral CT ............................................................................................... 47
Figure D-1: Coax BNC to clips cable ....................................................................................................... 49
Figure D-2: 2-pin connector and release key ......................................................................................... 49
Figure D-3: Disconnection of coaxial cables .......................................................................................... 50
Figure D-4: AA-170 - USB serial port ...................................................................................................... 51
Figure D-5: 100 points and ‘Set full range’ ............................................................................................. 51
Figure D-6: Save calibration as “open” ................................................................................................... 52
Figure D-7: Save "open" calibration data ............................................................................................... 52
Figure D-8: Open calibration................................................................................................................... 53
Figure D-9: Short calibration................................................................................................................... 53
Figure D-10: Load calibration ................................................................................................................. 53
Figure D-11: Use calibration data........................................................................................................... 53
Figure D-12: Bushing adaptor measurement ........................................................................................ 53
Figure D-13: Data analysis...................................................................................................................... 54
Figure D-14: Resistance between cable shield and ground .................................................................. 55
Figure D-15: R1 resistance measurement ............................................................................................. 55
Figure D-16: R2 resistance measurement ............................................................................................. 56
Table D-1: Results ................................................................................................................................... 57
Figure E-1: Communication options between the BMT 330 and a customer network........................ 58
Table E-1: Default TCP Port settings for communications module....................................................... 58
Figure E-2: Network status ..................................................................................................................... 58
Figure E-3: EasyConnect 4.10.0.zip file................................................................................................... 59
Figure E-4: EasyConnect 4.10.0 folder.................................................................................................... 59
Figure E-5: EasyConnect Setup.exe file.................................................................................................. 60
Figure E-6: License Agreement............................................................................................................... 60
Figure E-7: Choose Destination Location............................................................................................... 61
Figure E-8: Ready to Install the Program................................................................................................ 61
Figure E-9: Setup Status ......................................................................................................................... 62
Figure E-10: InstallShield Wizard Complete .......................................................................................... 62
Figure E-11: EasyConnect Installation folder & shortcut ...................................................................... 63
Figure E-12: EasyConnect main screen.................................................................................................. 63
Figure E-13: Upload Kalkitech module settings..................................................................................... 64
Figure E-14: Protocol Configuration ....................................................................................................... 64
Figure E-15: IP Configuration.................................................................................................................. 65
Figure E-16: LAN settings........................................................................................................................ 65
Figure E-17: Restart confirmation .......................................................................................................... 66
Figure E-18: IP address confirmation ..................................................................................................... 66
Table F-1: Front panel lights ................................................................................................................... 67
Table G-1: Problems and Actions ........................................................................................................... 68

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 5 of 69
Related Documents
Ref#
Title
CG-051
BMT 330 Pre-Installation Requirements
MA-018
BMT 330 User Manual
MA-019
BMT 330 Service Manual
WI-048
BMT 330 Commissioning Instructions
CG-058
BMT 330 Modbus Registers List
CG-049
BMT 330 DNP3 Objects & I/O Points Index
CG-050
BMT 330 IEC 61850 Objects & I/O Points Index

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 6 of 69
INTRODUCTION
Product Overview
Intellix™ BMT 330 (the product) is a monitoring system that continuously:
▪measures the condition of transformer bushings (through changes in Capacitance
and Power Factor) for one or two sets of three bushings in a single three-phase
transformer, or three single-phase transformers.
▪detects any Partial Discharges (PD) activity in the transformer main tank (measured
as high frequency pulses).
All measurements and alarms can be reported to a remote monitoring centre via the
standard RS-485 connection or one of the other available communications options.
Alternatively, they can be manually downloaded locally using the USB cable. The product
is supplied with PC configuration software that is used to set up the product. Refer to the
Intellix™ BMT 330 User Manual.
The following sensors can be fitted:
▪Three Bushing Adaptors (Primary input) connected to the tapping point of the
bushings being monitored.
▪(Optional) Three Bushing Adaptors (Secondary input) connected to the tapping
point of a second set of bushings being monitored.
▪Three Current Transformer (CT) sensors at the transformer(s) neutral (if available).
▪Three magnetically-mounted temperature sensors (MMTS) mounted on the
transformer tank(s) to measure the transformer top oil temperature.
▪A combined ambient temperature and humidity sensor mounted at the bottom of
the product cabinet.
Scope
This manual details the installation tasks for the product.
Abbreviations & Definitions
Table 1-1: Installation materials
Abbreviation
Meaning
BMT
Bushing Monitor for Transformers
HFCT
High Frequency Current Transformer
HV
High Voltage
LOTO
Lock Out, Tag Out procedure
LV
Low Voltage
PD
Partial Discharge

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 7 of 69
SAFETY
Symbols
The meaning of symbols used on the Intellix™ BMT 330:
Caution. Refer to the Installation Manual / User Manual to prevent death,
bodily injury, equipment damage or loss of data.
Electrical Hazard. Risk of electric shock.
Primary Protective Earth connection.
The meaning of safety symbols used in this manual:
Caution: A procedure, practice, or condition could cause death, bodily injury,
equipment damage or loss of data.
Electrical Hazard: Risk of electric shock.
Laser radiation: LED transmitters for fibre optics are classified as IEC
60825-1 Accessible Emission Limit (AEL) Class 1. Class 1 devices are eye-
safe to the unaided eye. Do not view directly with optical instruments.
Installer Safety
WARNING: All procedures in this manual must be followed. Any deviation
could cause irreversible damage to the transformer being monitored and/or
the Intellix™ BMT 330, and could lead to property damage, personal injury
and/or death.
WARNING: Before installing the Intellix™ BMT 330, third parties must have
received appropriate training for working at height. This includes, but is not
limited to, ‘Working at height’ and ‘Using Mobile Elevated Working
Platforms’.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 8 of 69
TECHNICAL SPECIFICATIONS
Measurements
Table 3-1: Measurements
Feature
Value
Input current measuring range
2 mA –200 mA rms, 1% of reading
Relative phase angle accuracy
0.01 deg of angle
Maximum number of PD measured
200 pulses per cycle (50 to 60 Hz)
Measurement category for signal inputs
CAT III. 5 V AC rms, 200 mA; on each phase
Maximum bushing temperature at Bushing
Adaptor
90 °C (194 °F)
Environmental
Table 3-2: Environmental
Feature
Value
Cabinet operating temperature range
−40 °C to +55° C (−22 °F to +131° F)
When equipped with multi-master comms
option
−20 °C to +55 °C (−4 °F to +131 °F)
Operating humidity range
5 to 95% RH, non-condensing
Maximum operating altitude
2000 m (6500 ft) above sea level
Storage temperature range
−40 °C to +85° C (−40 °F to +185 °F)
Minimum ambient temperature for
installation and service activities
−20 °C (−4 °F)
Cabinet protection level
IP55
Bushing Adaptor protection level
IP66
Intellix™ BMT 330 weight
20 kg (44 lb)
Bushing Adaptor weight
350 gm (0.8 lb), typical
Bushing Adaptor operating temperature
−40 °C to +90 °C (−40 °F to +194 °F) at
Bushing Tapping Point
Power
Table 3-3: Power
Feature
Value
AC Power supply requirement
100 to 240 V AC, 50 to 60 Hz, 1.24 to 0.41 A
Output relays (quantity 3)
Single Phase Change Over (SPCO),
Maximum Rating (resistive load):
2 A @ 240 V AC, 2 A @ 30 V DC
Fuse (one each on Live and Neutral)
10 × 38 mm time delay 500 V, 3 A

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 9 of 69
Type Tests
Table 3-4: Type Tests
Category
Standard
Class/Level
Test
EMC
Emissions
CISPR 11
A
Radiated & Conducted
Emissions
FCC part 15
A
Radiated & Conducted
Emissions
IEC 61000-3-2
A
Harmonic Current Emissions
Limits
EMC Immunity
IEC 61000-4-2
IV
Electrostatic Discharge
IEC 61000-4-3
III
Electro Magnetic Field
Immunity
IEC 61000-4-4
III
Electrical Fast Transients
IEC 61000-4-5
III
Surge Immunity
IEC 61000-4-6
III
Conducted RF Immunity
IEC 61000-4-8
IV & V
Magnetic Field Immunity
IEC 61000-4-11
III
Voltage Dips & Interruptions
IEC 61000-4-12
X 2.5 kV & 1 kV
Oscillatory Wave
IEC 61000-3-3
Pst 10 min, Plt 120 min
Voltage fluctuations & flicker
IEC 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
Environmental
IEC 60068-2-6
10-500Hz, 1g operation
10-500Hz, 1g endurance
Vibration
IEC 60068-2-30
55 °C, 95% RH
Damp Heat
EN 60529
Cabinet –IP55,
Adaptor –IP66
Degree of Protection
Safety
IEC 61010-1
2010 + Corr1
EN 61010-1
2010
UL 61010-1
3rd Edition

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 10 of 69
PRE-INSTALLATION
Location
The Intellix™ BMT 330 requires an installation location with:
▪an electrical supply of 230 V AC (1 A) or 110 V AC (2 A). The electrical supply must
have an independent means of disconnection and be clearly identified with a label.
▪a suitable site access to carry the product to its destination
Note: The dry weight of the product is approximately 20 kg.
▪a base that can take the 30 kg distributed load and accommodate the product
dimensions of
600 mm long × 400 mm wide × 200 mm deep.
There should be at least 750 mm clear space in front to allow access to the product.
In addition, the chosen location must:
▪not interfere with the transformer cooling system, regular maintenance activities or
operation of the electrical supply disconnection device.
▪be within the maximum line length of the chosen communications method.
It is recommended that the Intellix™ BMT 330 be:
▪installed sufficiently close to the transformer(s) so that the cable runs from the
product to the bushings are likely to be less than 25 m.
▪mounted on the transport stand (see Appendix A for dimensioned drawings).
Requirements
Observe the following requirements to install the product:
▪The transformer is to be de-energised, switched off and earthed for the duration of
the installation process.
▪Cable runs are required from the product location to the bushings.
▪To facilitate Bushing Adaptor installation and test, the customer is responsible for
supplying a safe and suitable working environment.
It is not recommended that the product be mounted directly on the
transformer. If this method of installation is being considered, contact GE
Technical Support.
All coaxial cables from the Bushing Adaptors to the product must be run
inside a protective electrically grounded metal conduit.
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
If working at heights is required during the product installation, it is the
responsibility of the installer as a minimum to:

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 11 of 69
Base & Access
The base should be level and sufficiently firm to allow the stand to be bolted down. See
Appendix A for the required dimensions. Consider the following factors:
▪The site should be readily accessible as the product weighs approximately 20 kg
(44 lb).
▪There should be 2 m (79 in.) headroom.
▪If a new concrete pad is required, the dimensions should be at least
610 mm (24 in.) long × 1220 mm (48 in.) wide × 90 mm (3 ½ in.) deep,
with an #3 (10 mm) steel reinforcing bar around the perimeter. This should be
grounded and bonded in accordance with local practice and code.
▪The product should never be mounted directly to the transformer without first
consulting GE Technical Support.
▪The intended AC supply is to be provided with a switch or circuit breaker so that it
can be independently de-energised. The location of the switch or circuit breaker
should be near the intended location of the product and within easy reach of the
operator.
If the GE manufactured mounting stand has not been purchased, a stand should be
constructed as outlined in Appendix A.
Communications & Power Cable Runs
If possible, communications and power cable runs from the intended product location to
their sources should be pre-installed. See Figure 5-1 for the general installation layout.
Bushing Adaptor Cable Runs
If possible, Bushing Adaptor cable runs from the intended product location to the
transformer bushings should be pre-installed. See Figure 5-1 for the general installation
layout.
▪Ensure that planned work complies with national and site regulatory
requirements.
▪Ensure that any third-party equipment to be used is suitable and safe
before commencing work.
▪Ensure that third parties have received appropriate training for
working at height. This includes, but is not limited to, ‘Working at
height’ and ‘Using Mobile Elevated Working Platforms’.
All coaxial cables from the Bushing Adaptors to the product cabinet must
be run inside a protective electrically grounded metal conduit.
All installation activity should take place in ambient temperatures greater
than −20 °C (−4 °F) to prevent damage to connectors and cabling because
they may become brittle at extreme low temperatures.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 12 of 69
Details of recommended conduit and fittings are listed in Appendix B.
All Bushing Adaptors and HFCT cables are run into the product cabinet. Each of these
coaxial cables must be properly identified using cable markers provided with the
installation kit (see Appendix B) as follows:
▪Cable for Primary input from phase A Bushing Adaptor: P1
▪Cable for Primary input from phase B Bushing Adaptor: P2
▪Cable for Primary input from phase C Bushing Adaptor: P3
▪Cable for Primary input from spare single phase Bushing Adaptor (if available): P4
▪Cable for Secondary input (if available) from phase A Bushing Adaptor: S1
▪Cable for Secondary input (if available) from phase B Bushing Adaptor: S2
▪Cable for Secondary input (if available) from phase C Bushing Adaptor: S3
▪Cable for Secondary input (if available) from spare single phase Bushing Adaptor (if
available): S4
▪Cable from HFCT (single tank or single phase A, if available): N1
▪Cable from single phase B (if available): N2
▪Cable from single phase C (if available): N3
▪Cable from spare single phase (if available): N4
The above coaxial cables are connected to the corresponding terminals of the grounding
switch inside the product cabinet, such that the central wire is routed to the core side
and the braid shield wire is routed to the shield side. See Appendix C.
If working at heights is required during the product installation, it is the
responsibility of the installer as a minimum to:
▪ensure that planned work complies with national and site regulatory
requirements.
▪ensure that any third-party equipment to be used is suitable and safe
before commencing work.
▪ensure that third parties have received appropriate training for
working at height. This includes, but is not limited to, ‘Working at
height’ and ‘Using Mobile Elevated Working Platforms’.
When installing conduit to Bushing Adaptors, ensure that the conduit drops
away from the Bushing Adaptor body.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 13 of 69
INSTALLATION
Figure 5-1 illustrates the general installation layout of an Intellix™ BMT 330 with the
required connections for a single transformer.
Figure 5-1: General installation layout - single transformer
Figure 5-2 illustrates the general installation layout of an Intellix™ BMT 330 with the
required connections for a bank of three single phase transformers.
Figure 5-2: General installation layout - Bank of 3 single phase transformers
The product is supplied with factory default settings for all parameters, e.g.
alarm thresholds. For optimal performance, specific settings are required
for each installation.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 14 of 69
Figure 5-3 shows the rear side of the product door.
Figure 5-3: Rear side of the product door
Figure 5-4 shows the key parts inside the product cabinet.
Figure 5-4: Inside the product cabinet
LED control board
Mains input
CANbus and
RS-485
Power supply
Relay
connectors
AC
protection
shield
System PCBs
Bushing & Neutral
CT inputs
Optional
communications
module
Grounding
bars
USB cable

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 15 of 69
Mounting
WARNING: Do not attempt to install the product unless the transformer is
de-energised and switched off.
WARNING: Ensure that the HV and LV bushings are grounded before
installation of the product.
WARNING: Once installed, the product may have more than one source of
supply. Disconnect all supplies at their source before accessing the cabinet
for servicing. Follow LOTO procedures.
The product should not be mounted where it may interfere with the
transformer cooling system or maintenance activities.
There should be at least 750 mm (30 in.) clearance in front of the product to
allow access to the cabinet.
Contact GE Technical Support before mounting the product directly on the
transformer.
The GE stand is shipped with the top portion of the stand inverted. Remove the
hardware holding the stand together, then remove the top section which is inverted
within the larger stand base, and assemble in an upright position reusing the original
hardware.
▪Use the diagram of the mounting stand footprint (see Appendix A) or the mounting
stand itself (recommended) to mark at least one hole in each mounting tab from the
mounting stand.
▪Use adequate concrete anchors (not supplied) to anchor the mounting stand to the
mounting surface.
▪Ensure that the stand is on a horizontal level surface.
Note: Three mounting holes are available on each foot of the stand base, but only one
hole is required for installation.
Bushing Adaptor Connections
A list of parts and tools required for the product installation is given in Appendix B.
Preparation of the coaxial cables is described in Appendix C.
The Bushing Adaptor is supplied assembled, but with both O-rings separately packed. In
overview the installation is composed of the following steps:
▪A pre-installation check is performed.
▪Conductive grease is applied to thread (threaded Bushing Adaptor only).
▪The whole Bushing Adaptor is screwed into the bushing tapping point.
▪The top cover of the Bushing Adaptor is removed leaving the body in place as
illustrated in Figure 5-5.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 16 of 69
▪A Bushing Adaptor circuit integrity test is performed.
▪The cabling is attached through the top cover and O-ring.
▪The top cover of the Busing Adaptor is re-attached as illustrated in Figure 5-6.
Figure 5-5: Bushing Adaptor - without top cover
Figure 5-6: Bushing Adaptor - with top cover
The rubber O-rings must not be contaminated with grease during the
assembly process.
Both ends of the coaxial cables for the Bushing Adaptor and Neutral CT
must be prepared and fitted with pin terminals as described in Appendix C.
All coaxial cables from the Bushing Adaptors to the product cabinet must
be run inside a protective electrically grounded metal conduit. See
Appendix B.3 for recommended conduit and fittings.
If working at heights is required during the product installation, it is the
responsibility of the installer as a minimum to:
▪Ensure that planned work complies with national and site regulatory
requirements.
▪Ensure that any third-party equipment to be used is suitable and safe
before commencing work.
▪Ensure that third parties have received appropriate training for
working at height. This includes, but is not limited to, ‘Working at
height’ and ‘Using Mobile Elevated Working Platforms’.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 17 of 69
Bushing Adapter Caps
The Bushing Adaptors are shipped with a plastic-threaded cap as shown in Figure 5-7.
Figure 5-7: Bushing Adaptor with cap
When removing the original test tap caps from the bushings, first check that they fit the
plastic-threaded cap from the new bushing adapter. If it is a good fit, continue with the
Bushing Adaptor installation. If the original test tap cap does not fit the plastic-threaded
cap, halt the installation and contact GE Technical Support.
Install a Bushing Adaptor
To install a Bushing Adaptor:
See Appendix D for the test procedure on how to verify the circuit integrity of the
Bushing Adaptor.
Check Bushing ID reference against Bushing Adaptor ID reference.
Remove the bushing test tap covers. Retain the tap covers in a safe place because they
will be required in the future when decommissioning the product.
With clean hands, put the smaller O-ring in its seat as shown in Figure 5-6.
Note: There are two spare O-rings supplied in the shipping package of each Bushing
Adaptor. Store these safely for future use should the Bushing Adaptor need to
be re-installed.
Apply the conductive grease to the bushing adaptor threads. The high temperature anti-
seize carbon conductive grease (supplied with the installation kit) must reach all
threads. To start, apply an even amount of grease to the first few threads as shown in
Figure 5-8.
WARNING: After connecting the Bushing Adaptor, it is crucial that the
Bushing Adaptor circuit integrity tests in Appendix D are performed.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 18 of 69
Figure 5-8: Bushing Adaptor with initial threads covered in grease
As the bushing adaptor is installed into the tapping point of the bushing, the grease will
work its way down ensuring an even coating across all threads as shown in Figure 5-9.
Figure 5-9: Bushing Adaptor with all threads covered in grease
Screw the complete Bushing Adaptor into the tapping point of the bushing. First just
hand-tighten and check that the resistance between the Bushing Adaptor body and the
bushing body is less than 5 Ω.
Note: If required, scrape a little paint off the bushing well to get a good conductive
path, or alternatively, find another suitable grounded point so that ground
continuity can be tested between the ground and the Bushing Adaptor body.
Tighten the Bushing Adaptor to the required torque defined in the installation drawing
(46-XXXX) provided with each Bushing Adaptor. It is important to tighten the Bushing
Adaptor in steps of 20 N m (15 lb ft) until you reach the final torque requirement to
minimise mechanical stress.
Note: A suitable torque wrench is specified in Table B-3: Customer-supplied items.
Finally, re-check that the resistance between the Bushing Adaptor body and the bushing
well is still less than 5 Ω.
Remove the five Allen key screws and remove the Bushing Adaptor top cover.
Note: Suitable tools are specified in Table B-3: Customer-supplied items.
Install a liquid-tight fitting (as listed in Table B-3: Customer-supplied items) into the
Bushing Adaptor top cover. Use a sealing gasket to ensure a liquid tight seal.
Note: The Bushing Adaptor thread for the liquid-tight fitting is ½ in. NPSM as
illustrated in Figure 5-10.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 19 of 69
Figure 5-10: Liquid-tight fitting thread
Thread the end of the metal liquid tight conduit as well as the coaxial cable into the
fitting. Terminate the conduit into the fitting carefully to form a liquid-tight assembly.
Place the O-ring in its seat for the cover (see Figure 5-5).
Connect the coaxial cable as outlined in Appendix C.4.
Figure 5-11: Bushing adaptor terminal block
Push the top cover down on its seat and re-assemble using the five Allen key screws.
To compress the sealing O-ring evenly, tighten the five screws progressively working
across the circle rather than around the circle of screws as illustrated in Figure 5-12.
Tighten the screws to the torque specified in the installation drawing (46-XXXX)
provided with each Bushing Adaptor.
Ensure that there is no tension or stress on the coaxial cable and that there
is a loop of cable inside the Bushing Adaptor to allow for strain relief of the
coaxial cable.

MA-017 –BMT 330 Installation Manual –Rev 3.3 4-Mar-22 Page 20 of 69
Figure 5-12: Tightening order
Route all the Bushing Adaptor cables through conduit to the product cabinet. If the
cabling is being routed as part of the pre-installation work, then ensure that the phase is
properly marked on each coaxial cable.
High Frequency Current Transformer (HFCT) Connection
Preparation of the coaxial cables is outlined in Appendix C.3 and C.6.
WARNING: Ensure that the Bushing Adaptor has been assembled carefully
with the liquid tight fitting and conduit to form a liquid tight connection.
Water ingress inside the bushing may result in catastrophic failure.
WARNING: The HFCT must be installed on a ground cable or bar going
from the high voltage neutral bushing (typically identified as H0) directly to
ground. There must not be any open switches between the path to ground
from the neutral bushing while the transformer is energized.
WARNING: If there is a switch on the path to ground from the high voltage
neutral bushing as shown in Figure 5-13, the HFCT must NOT be installed
between the switch and the neutral bushing, because if for any reason the
switch is opened there will no longer be a direct path to ground causing a
potentially hazardous condition.
WARNING: Prior to any test that requires the removal of the transformer
neutral ground, any installed HFCT must first be removed. Replace the
HFCT after the transformer ground has been reconnected.