Megger TTR300 User manual

TTR300_330A-UG-EN-V01
March 2018
Instruction Manual
for
Transformer
Ratio Test Set
TTR300
TTR330A
Catalog Number TTR300
Catalog Number TTR330A
Read this entire manual before operating.
M
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403-2329
U.S.A.
610-676-8500
www.megger.com

Transformer
Ratio Test Set
TTR300/TTR330A

Copyright© 2018 by Megger. All rights reserved.
The information presented in this manual is believed to be adequate for the intended use of the product.
If the product or its individual instruments are used for purposes other than those specified herein,
confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty
information below. Specifications are subject to change without notice.
WARRANTY
Products supplied by Megger are warranted against defects in material and workmanship for a period of
one year following shipment. Our liability is specifically limited to replacing or repairing, at our option,
defective equipment. Equipment returned to the factory for repair must be shipped prepaid and insured.
Contact your MEGGER representative for instructions and a return authorization (RA) number. Please
indicate all pertinent information, including problem symptoms. Also specify the serial number and the
catalog number of the unit. This warranty does not include batteries, lamps or other expendable items,
where the original manufacturer’s warranty shall apply. We make no other warranty. The warranty is
void in the event of abuse (failure to follow recommended operating procedures) or failure by the
customer to perform specific maintenance as indicated in this manual.
M
Valley Forge Corporate Center
2621 Van Buren Ave
Norristown, PA 19403-2329
610-676-8500 (Telephone)
610-676-8610 (Fax)
www.megger.com

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Table of Contents
Upon Receipt of Product..................................................................................................................................v
1 PRODUCT OVERVIEW 300/330A..............................................................................................................1
Top Panel Controls............................................................................................................................................2
TTR330A Top Panel Facilities ......................................................................................................................4
2 SAFETY...............................................................................................................................................................7
Safety is the Responsibility of the User ..........................................................................................................7
General Safety Precautions...............................................................................................................................7
Input Power Precautions ..................................................................................................................................8
3 SPECIFICATIONS............................................................................................................................................9
Electrical..............................................................................................................................................................9
Input Power......................................................................................................................................................9
Protective Devices...........................................................................................................................................9
Output Test Voltage and Current .................................................................................................................9
Test Frequency.............................................................................................................................................. 10
Loading of Test Transformer ..................................................................................................................... 10
Measuring Ranges......................................................................................................................................... 10
Accuracy......................................................................................................................................................... 10
Measurement Method .................................................................................................................................. 11
Transformer Winding Phase Relationship................................................................................................ 11
Measuring Time ............................................................................................................................................ 11
Display.............................................................................................................................................................. 11
Memory Storage .............................................................................................................................................. 11
Communication Interface.............................................................................................................................. 11
Safety/EMC/Vibration.................................................................................................................................. 11
Physical Data.................................................................................................................................................... 12
Environmental Conditions ............................................................................................................................ 12
4 SOFTWARE INSTALLATION................................................................................................................... 13
PowerDB Lite Setup & Installation (PC Control only)............................................................................. 13
Software Installation (PC portion only)....................................................................................................... 14
5 GENERAL TESTING PROCEDURES.................................................................................................... 17
Site Preparation ............................................................................................................................................... 17
Making Circuit Connections.......................................................................................................................... 17
Operating the TTR300/330A ....................................................................................................................... 19
6 THREE-PHASE Transformer RATIO TESTING................................................................................... 21
Procedure ......................................................................................................................................................... 21
Test Form Controls - General ...................................................................................................................... 23
Transformer Test Conditions........................................................................................................................ 25
Instrument Settings Button ........................................................................................................................... 25
Ratio Testing Methods................................................................................................................................... 27
7 RATIO TRANSFORMER TESTING APPLICATIONS....................................................................... 29
Single-Phase, Two-Winding Transformers –including Typical Pole Type transformers with Dual
Secondary’s....................................................................................................................................................... 30
Three-Phase, Two-Winding Transformers ................................................................................................. 34
Three-Phase, Three-Winding Transformers............................................................................................... 36

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Current Transformers (CTs) ..........................................................................................................................37
Unmounted CTs ..............................................................................................................................................37
Bushing Current Transformer (BCT) Mounted on Single-Phase, Two-Winding Transformer...........39
Bushing Current Transformer (BCT) Mounted on Three-Phase Transformers....................................40
8 SAVE/RETRIEVE RESULTS......................................................................................................................43
9 TTR300 – Self check ........................................................................................................................................47
Reason for possible Inaccuracy in 1:1 Self Test:.........................................................................................47
Troubleshooting...............................................................................................................................................48
10 ORDERING INFORMATION / SPARE PARTS..................................................................................51
11 SERVICE..........................................................................................................................................................53
Maintenance......................................................................................................................................................53
Fuse Replacement............................................................................................................................................53
Calibration.........................................................................................................................................................54
Repairs...............................................................................................................................................................55

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List of Figures
TTR300 Transformer Test Set................................................................................................................................v
TTR330A Transformer Test Set.............................................................................................................................v
Figure 1-1:TTR300 Front Panel .......................................................................................................................2
Figure 1-2:TTR330A Front Panel ....................................................................................................................2
Figure 1-3: TTR330A Industrial Controller with Display...............................................................................4
Figure 6-1:TTR Display on Startup (TTR330A)........................................................................................ 21
Figure 6-2:TTR300/330A using PC Software............................................................................................. 22
Figure 6-3 Form Selection Table......................................................................................................................... 22
Figure 6-4:Header Input ................................................................................................................................. 23
Figure 6-5:Nameplate MINIMUM Input.................................................................................................... 24
Figure 6-6:Nameplate Input........................................................................................................................... 24
Figure 6-7:Transformer Test Conditions ..................................................................................................... 25
Figure 6-8:Instrument Setup Screen – Test Settings ................................................................................. 25
Figure 6-9:Settings Screen – Form Test Sections for Form Display....................................................... 26
Figure 7-1Setup for Testing Single-Phase Transformer............................................................................ 30
Figure 7-2Setup for Testing Single-Phase Autotransformer .................................................................... 31
Figure 7-3Setup for Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator............... 32
Figure 7-4Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator.............. 32
Figure 7-5Connections to a Pole Type Transformer with 2 secondary windings. ................................... 33
Figure 7-6 Typical Connection to a 2 Winding YNyn or ZigZag–8 Terminal Transformer................... 35
Figure 7-7Typical Connection to a Delta Delta or Yy (no neutral) 6 Terminal Transformer................ 35
Figure 7-8Setup for Testing Unmounted Current Transformer................................................................. 38
Figure 7-9Setup for Testing Taps on Multiple Tap CT................................................................................ 38
Figure 7-10Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer..................... 39
Figure 7-11Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power Transformer
41
Figure 7-12Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer ............. 42

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Upon Receipt of Product
Prior to operation, check for loosened hardware or damage incurred during
transit. If these conditions are found, a safety hazard is likely, DO NOT attempt
to operate equipment. Please contact Megger as soon as possible.
TTR300 Transformer Test Set TTR330A Transformer Test Set

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1
PRODUCT OVERVIEW TTR300/330A
The Three-Phase TTRTest Set is fully automatic, self-checking, menu-driven
unit. The test set measures the turn ratio, phase shift, and excitation current of
power, distribution, and instrument transformers. A “-47” suffix added to the
catalog number denotes a 50Hz input power supply, rather than the standard
60Hz supply. The test set is a portable instrument housed in a sturdy plastic case
with removable lid and carrying strap. The inside lining of case is metal shielded.
A canvas carrying bag is supplied to hold all accessories.
The test set can be used to test single-phase and three-phase transformers, both
with and without taps in accordance with the requirements of the IEEE
C57.12.90 – 2013 standards as well as IEC 60076-1. For three-phase
measurements, the test set is connected to all three phases of the transformer to
be tested. The TTR lead selection circuitry permits automatic measurement of all
phases without changing connections. Turn ratio, phase shift and excitation
current readings are displayed on via either a customer PC or the built in 12 inch
(305mm) display.

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Top Panel Controls
Figure 1-1:TTR300 Front Panel
Figure 1-2:TTR330A Front Panel

Product Overview TTR300/330A
TTR300_330A-UG-EN-V01 March 2018
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Input AC Power Module:
This module is an IEC320 interface to the mains power. The
module has an integrated switch, fuse holder and input filter
module. Above the module are the voltage, frequency and power
requirements for the product. Below the module are the fuse type
and ratings based on the input voltage used. The green light on
the right side of the module illuminates when power is ON.
O , OFF position
1 (-) , ON position
Primary Interface Connection from the Transformer to the
Unit:
This connection has all of the interfaces required to connect
current and voltage inputs from a three phase transformer into the
TTR3XXunit.
Test Voltage ON light:
Red indicator lamp indicates that test voltage is being supplied to
the Unit Under Test (UUT).
Secondary/Tertiary Interface Connection from the
Transformer to the Unit:
This connection has all of the interfaces required to connect
current and voltage inputs from a three phase transformer into the
TTR3XX unit.
Serial Connection (TTR300 only):
This connection allows PC control of TTR300 using PowerDB Lite
or PowerDB PRO software.
Earth/Ground Lug
This connection is used to connect a transformer under test to
earth ground for safety. The transformer and the TTR shall be at
the power ground/earth potential when being operated.
Emergency Shut Down Switch
This switch, when pushed will disable the source power supply
and automatically discharge the transformer. The instrument is
continuously monitoring this switch in the event of an emergency.
If the switch is engaged, no testing can commence.

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Remote Control Switch (TTR300 ONLY)
This connector is used to interface with a remote switch. This switch
is primarily used when testing both On-Load Taps (OLTC) and
DETC of a transformer
The Remote Control Switch can remotely start the TTR test and
store multiple ratio readings for tap changes. The storage function in
remote mode is sequential and occurs during a continuous ratio test.
TTR330A Top Panel Facilities
Figure 1-3: TTR330A Industrial Controller with Display
The optional industrial 12 inch controller is:
1. Industrial 305 mm (12 inch) Touch Display: Used in place of a PC.
Designed to run PowerDB Lite with focus on selected Megger instrument
control related to transformer testing. When turned on, defaults to TTR
transformer forms.
2. Built-in Printer: Designed to print individual results and is active within
specific forms via 'print icon' located within selected forms.
3. USB Port: Used for various functions including external memory and
external mouse/keyboard control.

Product Overview TTR300/330A
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4. Rear USB Port Hub: Used for external Megger instrument control such
as Delta4000, S1/MIT Insulation test set, MLR10.
5. Rear Ethernet Port: Used for external Megger instrument control –
specifically the Delta4000, MTO250 and MTO3XX .
The TTR330A 305 mm (12 inch) display is meant to replace a customer PC
with an industrial controller designed to work in harsh environments. This
built- in display features protection against accidental shut down of the
instrument by safely turning off Windows operating system together with
PowerDB after shutdown (switch is turned off) is detected. This safe
shutdown prevents damage to the internal memory, and to the software
operating system.
4
5

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2
SAFETY
Safety is the Responsibility of the User
Only qualified and trained operators should operate the TTR300/330A.
Operator must read and understand this entire Instruction Manual prior to
operating the equipment. Operator must follow the instructions of this
Instruction Manual and attend the equipment while the equipment is in use. In
the event of equipment malfunction, the unit should immediately be de-
energized and returned to Megger for repair. The Safety precautions, herein, are
not intended to replace your Company’s Safety Procedures. Refer to IEEE 510 -
1983, IEEE Recommended Practices for Safety in High-Voltage and High-Power Testing,
for additional information.
General Safety Precautions
The TTR300/330A and the Unit Under Test (UUT) should both be considered
as sources of instantaneously lethal levels of electrical energy. Observe the
following safety precautions:
Observe all safety warnings on the equipment. They identify areas of
immediate hazard that could result in injury or death.
Use this equipment only for the purposes described in this manual. Observe
strictly the Warning and Caution information provided in this manual
Treat all terminals of high-voltage power equipment systems as potential
electric shock hazards. Use all practical safety precautions to prevent contact
with energized parts of the equipment and related circuits.
Use suitable barriers, barricades, or warnings to keep persons not directly
involved with the work away from test activities.
Never connect the test equipment to energized equipment.
Do not use in an explosive atmosphere.
Use the grounding and connection procedures recommended in this manual.
Always disconnect test leads from power equipment before attempting to
disconnect them at the test set. The ground connection must be the first

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made and the last removed. Any interruption of the grounding connection
can create an electrical shock hazard.
Personnel using heart pacemakers should obtain expert advice on the
possible risks before operating this equipment or being close to the
equipment during operation.
Input Power Precautions
This instrument operates from a single-phase, sine wave, power source. It has a
three-wire power cord and requires a two-pole, three-terminal (live, neutral, and
ground) type input source. The voltage to ground from the live pole of the
power source must be within the following rated operating voltage:
Cat. No TTR300 108-132V/ 207-253V*, 60 Hz, ±2 Hz, 100VA
Cat. No. TTR330A 108-132V/ 207-253V* 60 Hz, ±2 Hz, 100VA
*- When a “-47” is added, this denotes a requirement for a fuse change for safe 230 V
operation – see Specifications below, as well as calibration to 50Hz (affects phase deviation
calibration only)
The neutral pole must be at ground potential. Before making connection to the
power source, determine that the instrument rating matches the voltage of the
power source. The power input plug must be inserted only into a mating
receptacle with a ground contact. Do not bypass the grounding connection. Any
interruption of the grounding connection can create an electric shock hazard.
Determine that the receptacle is properly wired before inserting the plug.
For test sets energized with 230V input, the neutral terminal of the input supply
cord (white or blue lead) must be connected to the neutral pole of the line power
source. The ground terminal of the input supply cord (green or yellow/green
lead) must be connected to the protective ground (earth) terminal of the line
power source. The black or brown cord lead is the live (hot) lead.
The control circuits of the instrument are protected by two mains circuit fuses.
These fuses are located in the ON/OFF switch module and are replaceable by
the operator. To avoid electric shock and fire hazard, use only the fuse specified
in Section 3 - Specifications that is identical in respect to type, voltage rating, and
current rating.
F WARNING
Before replacing the fuses, disconnect the power input
plug from the live power source.

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3
SPECIFICATIONS
Electrical
Input Power
Cat. No. TTR300 &
TTR330A:
120/230 V, ±10%, 60 Hz, ±2 Hz, 100 VA
IEC 1010-1 installation category II
Cat. No. TTR300-47 &
TTR330A-47:
120/230 V, ±10%, 50 Hz, ±2 Hz, 100 VA
IEC 1010-1 installation category II
Protective Devices
Fuses (2)*:
Cat. No. TTR330: Type T, 250 V, 2.0 A (IEC 127 designation)
Cat. No. TTR330A-47: Type T, 250 V, 1.6 A (IEC 127 designation)
High voltage and low voltage measurement circuit shorting relays
Heavy duty varistors, transient voltage suppressors, and gas surge voltage
protectors
Output Test Voltage and Current
3 Test Voltages: 80 V rms, 40 V rms, 8 V rms.
Current: up to 500 mA

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Test Frequency
Same as line frequency.
Loading of Test Transformer
Less than 0.2 VA
Measuring Ranges
Turns ratio: 80 V ac: 0.8 to 45,000, 5 digit resolution
40 V ac: 0.8 to 25,000, 5 digit resolution
8V ac: 0.8 to 8,000, 5 digit resolution
Excitation Current: 0 to 500 mA, 3 digit resolution
Phase Angle Deviation: ± 90 degrees, 1 decimal point for the minutes display, 2
decimal point for the degree display, 2 decimal points for
the centiradian display
Accuracy: ±3 minutes ( ±0.05 degrees)
Accuracy
Turns Ratio:
80 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.25% (4001 to 10000)
±0.3% (10001 to 45000)
40 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.3% (4001 to 10000)
±0.35% (10001 to 25000)
8 V ac: ±0.1% (0.8 to 2000)
±0.25% (2001 to 4000)
±0.35% (4001 to 8000)
Resolution: 5 digits for all ratios
Excitation Current (rms): 0 to 500 mA, 3 digit resolution
±(2% of reading + 1 digit)
Phase Angle Deviation:
(Limit of Ratio)
±3 minutes
(0.08:1 to 2000:1)