transformer test system

Technical Specification：SF-315 Transformer Test System Customer: HHI POWER SDN BHD Page 1 total 18

Add:No.9 longchuan North Road, Jiangdu,Yangzhou City, Jiangsu province,China Tel:+86-514-86688088

Technical Specification System: Transformer Test System

Model: SF-100

Date：Aug 2, 2011

A．Introduction:

A complete line of Transformer Test Systems, from a small portable unit with a rating of 5kVA to Power Transformer Testing Systems capable of testing transformers with very high voltage and power ratings can be supplied. The line includes both single and three phase system for both distribution and power transformers. SF-100 transformer test system is designed for testing single and three phases, pad or pole mounted distribution transformer and power transformer up to and including 11kV class with maximum impedance of 6%. This system will perform tests in accordance with IEC60076 and IEEE C57 serial latest edition standards. We have the capability to offer a custom built system to each client. Our design engineers will work with you to develop a test system exactly suited to your requirements.

We Research & Development department has developed transformer test systems that offer the customer reliability and flexibility. By utilizing Programmable Logic Controllers (PLC) in the control system, the SFBT-IV serial SF allows the customer the ability to add optional features or change the test sets operating procedures by reprogramming the PLC. This is much more cost effective than rewiring the test set as was required in traditional test systems. Reliability is a top priority for Us. Craftsmanship and the use of top quality materials and components insure the customer years of reliable service from their SFBT-IV transformer test system.

All test data are recorded automatically and the necessary correction calculations per ANSI C57 and IEC 60076 standards are performed automatically. The system calculates corrected losses, efficiency, regulation and percent impedance automatically after the test. Computer aided data acquisition is increasingly becoming the standard as customers demand computer generated reports that reduce operator error. The system features Microsoft Windows -based testing software which builds a data base of transformer test results and creates accurate final test reports in Microsoft Office format. Setup maps for each test are provided to reduce costly connection mistakes.

B．Testing Project:

All SFBT-IV test systems are designed to perform transformer tests in accordance



with ANSI C57 and IEC 60076 standards, latest edition. These tests include: Excitation Current Measurement Excitation Loss (No-load or core loss) Impedance Voltage Measurement Full Load Current Measurement Copper Loss (Load loss) Induced Potential Test (with M/G set addition) Winding DC resistance test (with DC RES. Meter addition)

C. Input power source:

Main Power: 3 Phases, 4 wire, 433VAC, 50Hz Max. Power supply capacity: 50KVA, 67A @ 433V Control Power: 1 Phase, 240VAC, 50 Hz, 16AAC

D. Output Voltage

0—800V AC

E. Test ability

SF-100 can be used for distribution transformer with maximal primary voltage 11KV, maximal capacity 3000KVA with impedance 7%.

F. Tests Can Be Conducted

No load loss test Load loss test Induced over voltage test Partial discharge test

G. Safe features

EMERGENCY OFF mushroom switch Main power circuit breaker with indicator ZERO START interlock with auto return of regulator to zero position



Slow and fast-acting protective devices on power trans-former, regulator, measurement system, and other critical components

Separate ground fault safety circuit External interlock provision Control power key switch with indicator Flashing red warning light during test Foot switch for operator safety Surge protection devices on all meters and relays

H. Standard design features

Three-wattmeter method power measurement circuit. Three phase, four-wire measurement system

Controls and metering are built into main cabinet (rack mount style) with writing zone

Motorized control of output voltage with adjustable rate of ascending & descending

Ascending and descending push buttons with OFF ZERO indicator TEST MODE selector switch with indicator, only one function at the

same time HOLD feature to freeze all meter displays for recording data Continuously variable output from zero to full, adjustable rate of rise RMS and mean responding voltage measurement

I. Main components Power cabinet Control desk Motor generator set for induced over voltage test HI-POT for applied high potential test(Optional) Output filter PD tester

J. Component description



Part 1. Power cabinet:

1.1 Regulator

100kVAduced regulator Output voltage: 0-690V, 50Hz, 3Phases. Output current: 84A AC The output is adjusted by a automatically controlled motor mounted on the

regulator. Oil immersed regulator is used The motor speed can be controlled by user.

1.2 The Potential transformer

Maximum input Voltage: 866V, 200Hz. Maximum output Voltage 200V AC, 200Hz. Accuracy: 0.1% @ 50Hz, 0.2% @ 200Hz. Insulation degree: 866V @50Hz. For loss test(@50Hz): Burden: 5VA

Input Taps Output Taps Ratio X A1 K1 K2 433V/100V X A2 K1 K2 866V/100V

The ratio of the potential transformer is controlled by contactor For induced over voltage test(@200Hz):

Input Taps Output Taps Ratio X A1 K1 K2 433V/100V X A2 K1 K2 866KV/100V

The Potential transformer is controlled by Contactor.

1.3 The current transformer

Maximum Input current: 500A Maximum Output current 5A Accuracy：0.1% @50Hz, 0.2% @200Hz Insulation degree: 866V Burden: 10VA

Input Taps Output Taps Ratio

L1 L2 K1 K2 500A/5A



L1 L3 K1 K2 250A/5A L1 L4 K1 K2 100A/5A L1 L5 K1 K2 50A/5A L1 L7 K1 K2 25A/5A L1 L6 K1 K2 10A/5A L1 L8 K1 K2 5A/5A

The current transformer is controlled by PLC mounted in the control cabinet, its tap can be changed automatically by PC command.

1.4 Capacitor Bank

There is a capacitor bank used for load loss test, the active used capacitor is control by user. Max. capacity: 334Kvar Rated voltage: 690V Consist of 10 capacitors Any one can be on line, or off line. 3 phases

1.5 Control and Protective Functions for Power Cabinet.

Control functions: Regulator output control for load loss test Motor generator set control for induced over voltage test Motor generator set control for induced over voltage test Regulator status output to control desk Motor generator status output to control desk

Protective functions Over voltage protection for regulator Over current protection for regulator Over current protection for CT Over voltage protection for PT Over voltage protection for motor generator set Over current protection for motor generator set



1.6 Weight: about 2500Kg

1.7 Size: 2200mm Wide x 2000mm Deep x 2400mm High.

(For reference)

Part 2: Control Desk

2.1 The control panel

Carbonic steel body Pushbuttons and indicators for choice of test function. Pushbuttons and indicators for regulator’s motor control. Pushbuttons and indicators for induced over voltage test. Pushbutton and indicators for Motor Generator Set control.



4 1/2 digit frequency meter for induced over voltage test. 3 phases current,3phases voltage meter to watch the output of regulator Indicators to indicate system status, for examples, over load status.

2.2 WT500 Power Analyzer(YOKOGAWA)

The WT500 power analyzer features a color TFT and compact body that enables single-phase and three-phases power measurement, achieving 0.1% base accuracy, maximum input of 1000Vrms, 40Arms and a measure bandwidth of 100 kHz.

With GPIB interface connected to PC. Excitation Current Measurement Excitation Loss (No-load or core loss) Impedance Voltage Measurement Full Load Current Measurement Copper Loss (Load loss) Voltage measurement for induced over voltage test. Current measurement for induced over voltage test. Voltage measurement for temperature rise test. Current measurement for temperature rise test. Power measurement for temperature rise test. Provided by Yokogawa, Japan. (For more information see “WT500 Power Analyzer User’s Manual”)

2.3 PLC controller

Used for pushbuttons and indicators, tap control, CT control. Regulator’s Motor control. Control for Current transformer. Control for potential transformer. Output voltage control (ascending, descending, stop). Control for induced over voltage test. With RS-485 interface.

2.4 Power supply

DC24V 10A for pushbuttons , indicators, relays. DC12V 2A for regulator’s motor for AVR. DC5V 3A for RS232-RS485 converter. DC Output for output voltage redressal of Motor Generator Set.



2.5 Timer/Counter

Used for induced over voltage test Timer value is set manually. If the setting value has been arrived, the output voltage returns to the

beginning value automatically.

2.6 Protective Functions for power cabinet.

Output over current protection during no load & load test. Output over voltage protection during no load & load test. Output over voltage protection during induced over voltage test. Output over current protection during induced over voltage test.

2.7 Control methods:

Manual: The test process is controlled by pushbuttons on the front panel. The test data is recorded manually, saved in database manually. Test item can be selected by pushing a button; only one task can be processed

at the same time. Automatic: The test process can be controlled by Keyboard & Mouse connected to PC

through PC software (Microsoft Windows based). The tested data is recorded automatically, saved in database automatically. The tested data saved in database can be listed, queried, displayed, and

printed out. The pushbutton on the front panel is can be used also. Test item can be selected by push button on dialog window; only one task

can be processed at the same time. In case of temperature rise test, functions for automatic control of constant

power or current and automatically record the test data at 30 minutes interval or selectable interval is supported.

Some test results such as insulating resistance, oil breakdown voltage can be manually input to the file to complete the test report

All test results can be corrected to reference condition according to IEC 60076 and ANSI C57.

After finish the test, test report can be able to print out from computer immediately



2.8 Weight: about 400Kg.

2.9 Size: 2000mm Wide x 1100mm Deep x 1200mm High.

Part 3. PC Software Computer aided data acquisition is increasingly becoming the standard as

customers demand computer generated reports automatically that reduce operator’s error. We has designed a complete data acquisition system to record all test data and perform the necessary correction calculations according to ANSI C57 and IEC 60076 standards. The system calculates corrected losses, efficiency, regulation and impedance. Time saved by eliminating manual data recording and calculation results in rapid pay back of the system. The system features Windows based testing software which builds a data base of transformer test results and creates accurate final test reports. The software offers easy step by step instructions to guide the operator



through each test procedure. Setup maps for each test are provided to reduce costly connection mistakes. The options section allows the software to be easily customized to any hardware the customer may have.

This software has been especially designed for intuitive, fast, easy and safe user interrogations. Status information and test results are visualized by graphical symbols, colored values, pop-up windows and detailed graphs. Large buttons and standardized input fields ensure a correct and easy operation of the system.

The main window of the SFBT-IV PC software is divided into three sections: Test preparation: All file handling, setup parameter and order data can be

entered in this area. Additionally a continuous text field allows the input of general remarks like global documentation or application notes.

Measurement applications: This section provides access to the different transformer tests (load loss, no-load loss, heat run, zero sequence, induced voltage, wattmeter, self test). Control the test system and recode the tested data. The measuring window shows all data at a glance and can be operated by mouse. Green measurement values indicate correct measured data while red numbers mean a not optimal utilized or overloaded ranges. This supports easy status overview and ranging.

Reporting: This part of the window is for creation, viewing and printing of the test report. The report is stored in Microsoft Excel format.

Operator uses the dialog windows and buttons to control the SF, and gets the system status form status windows. It has the flowing functions System parameter setting. Regulator’s motor control. Controlling the output voltage & current. Managing the tested data & records. Data correction calculation according to IEC 60076, IEEE C57. Communication with meters, PLC, power analyzer, temperature inspector,

etc. Displaying the system status. Comply with:

IEC 60076-1 IEC 60076-2 IEC 60076-3 IEC 60076-4 IEC 60076-11 IEEE C57.12.00 IEEE C57.12.90 IEC 60060-1 IEC 60060-2 IEC 60060-3



(For reference)



Part 4. Motor Generator Set for induced test The motor generator set is used for Induced over voltage test, Technical data: Input Voltage: 3 phases 433VAC, 50Hz, Output Voltage: 3 phases 40-866V AC(the output is variable according to the

exciting current, which can be controlled by operator in Microsoft Windows dialog windows)

Motor power: 36KW, Generator power:50kVA, Generator power factor: 0.5 Output frequency: 125Hz. THD < 3%, 3 phases, 4wires. Including: chassis, shaft for motor and generator etc. Comply with: IEC 60034 Rotating Electric machine

Part 5. Partial Discharge Tester

5.1 Analog PD tester (multi-channel) specification

Configuration

PD tester（SF-2001）+ multi-channel detect part（DTD-2002） Layout picture



Features

The tester allows test at the same time in 6 channels, especially suitable for

10KV, 220KV and 500KV transformer test. Once the voltage rises, PD in 6

channels could be detected, thus to avoid damage caused by multiple voltage

boost.

Independent PC for 6 channels in the true sense, not switch changeover.

Special anti-interference electronic digital device, could distinguish irregular,

discontinuous interference, strong in anti-interference.

The anti-interference device could also remove differences caused by

operation of different personnel to get a reasonable PD value.



PC setting, with perfect design and easy operation. The PD value could be

read directly after measurement.

Good time sequence coordination between impulse peak meter sampling and

digital voltmeter reading to ensure the accuracy of test.

Discharge times of a certain PC value （repetition rate n）could be detected.

q—n, n—ψ,q—ψ could also be detected together with other units.

（q—discharge, ψ—phase angle）

Digital meter display, could watch different parameters at the same time.

Compact and light, suitable for power department and manufacture shops, as

well as scientific research and tests.

High sensitivity, suitable for a wide range of test objects.

Technical Data

Capacity range of test object: 6pf～250μf

Test sensitivity: <0.02pc（at capacity of 50pf）

Ellipse scanning time base: 50, 100,150,200Hz, 30о as one scale， 360о

rotation，intake power＜1VA

Amplifier：3db low end frequency f1, 10, 20,40kHz optional;3db high end

frequency fh, 80,200, 300kHz optional; gain adjustable range >120db, scale



gain difference 20± 1db;positive and negative impulse response asymmetry

<1db.

Time window: window width 15о～150о, window 0～170о rotatable

Impulse peak meter: linearity，31/2 bit LED display, error <5%F.S.

Test voltmeter: scale range 50,100,150,200kV, digital display time error ＜

3%F.S.

PC setting：scale range 0.1 PC～1000 NC（1NC=1000 PC）

Interference distinguish logic：impulse peak exceed threshold value（settable

by user, 4 or above continuous test voltage periods, “effective” lamp display

Discharge repetition rate: scale range 1×104pps，error：＜5%F.S.

Zero flag display: with sign of true zero for test voltage, as well as

supplementary zero adjustment system.

Dimension：500×490×200mm（length ×width ×height）

Weight：approx. 15kg

5.2. Digital PD tester (multi-channel)

SF-9064 digital PD tester work principle

The device consists of three modules: signal process module, isolation module and collection module. According to the connection diagram, inspecting impedance detects the PD signal and transfers the signals to signal process module where the signals are processed, amplified and shaped. Then the signals will be transferred to the



isolation module where computer collected module and signal process are separated. Finally the collection module processes, analyses and display the PD signals.

Schematics

SF-9064 digital PD tester features

Data acquisition card of high speed, large capacity，could acquire date

continuously; good data reproducibility, high accuracy.

Could test, analyze (multi-parameter analysis, two dimension mapping analysis

and three dimension mapping analysis)

Could display at the same time PD waveform (oval, sine wave, line), PD value

and test voltage

Could automatically adjust gain during calibration and test.

Could work with power supply of 50HZ, 150HZ, up to 400HZ; could

automatically trace frequency of external power supply.



Windowing setting min 1°

Could measure with single or six channels.

Compact and light, suitable for power department and manufacture shops, as well

as scientific research and tests.

High sensitivity, suitable for a wide range of test objects.

Technical Data

Capacity range of test object：6pf～250μf

Test sensitivity:<0.02pc（at capacity of 50pf）

Amplifier：3db low end frequency f1,10,20,30,50,80kHz optional;3db high end

frequency fh, 100 ,200,300k,400,500KHz optional; gain adjustable

range >120db, scale gain difference 20± 1db; positive and negative impulse

response asymmetry <1db.

Time window: window width 1о～360о, window rotatable at any angle

Test voltmeter:0-- 200kV, digital display time error＜3%F.S.

Collection channel:4 channels

Input impedance: 1MΩ

Capture card max sampling rate: 20MHZ

AD resolution: 12BIT。DC accuracy: 0.2%

Each channel sampling length: 8M

Trigger approach: manual operation, external trigger, internal trigger

Capture card bandwidth: 3MHZ（-3DB）



Weight：approx.15kg

Spare Parts

SF-100 Spare Component List No. Item Part type Part value Technical data Qty Manufacture Comment

1 Fuse 1A 250V 10 2 Fuse 2A 250V 10 3 Fuse 3A 250V 10 4 Fuse 5A 250V 10 5 Fuse 10A 250V 10 6 Fuse 16A 250V 10 7 Indicator Red 250VAC R22 2 8 Indicator Green 250VAC R22 2 9 Indicator Yellow 250VAC R22 2

10 Pushbutton Green R22 2 11 Pushbutton Red R22 2 12 Pushbutton Yellow R22 2

Documents

transformer test system