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Current Transformer Test
measures insulation, excitation current, turns ratio, winding polarity saturation and/or winding resistance. Current Transformers
See Also: Transformer Test, Transformer Testers, Current Transformer Test Set
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Fully Automatic Transformer Winding Resistance Tester
Measure DC resistance of transformers windings etc. Introduction: The NMC ''TDR'' is a high precision, new generation, light weight large output current and micro-processor controlled tester. This replaces old DC wheat stone bridge and double arm bridge for measurement of DC resistance. ''TDR'' adopts new advanced test current power supply technology, four terminal measurement, digital display of resistance value and test current. ''TDR'' is powered by 220V AC mains single phase supply. The measurements are accurate as the test current is highly stable. High automation is achieved with automatic discharge warning.Principle: The constant current generated is fed to the resistance under test through the current terminals and the voltage drop across the resistance under test is measured and displayed in ohms. A true four terminal measurement is used to eliminate the need for lead resistance compensation.
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Current Booster
PHPC01
PHPC01 current booster is an accessory which can work together with protection relay test kit to test transformer protection relay testing. It is specifically designed to supply high compliance voltage even at small current range.
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ANSI Metering Current Transformer Burden
The ANSI Current transformer burden is designed for loading the current transformer during accuracy Tests. The ANSI burden is designed as per ANSI burden C57.13.It can be used along with the Eltel Automatic Instrument Transformer Test Set to test CTs as per ANSI Standards.
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Transformer Ratio Meters
Handheld Turns Ratio & Winding Resistance Tester TWR-H
TWR-H is a handheld, battery operated, fully automatic test set specially designed for turns ratio, phase shift, excitation current and winding resistance measurements of transformers. It can also perform demagnetization of these transformers. Transformer turns ratio is determined by applying AC voltage across high voltage winding, accurately measuring AC voltage across the corresponding unloaded transformer winding, and then displaying the ratio of these voltages. User can enter a transformer’s nameplate voltages, so that turns ratio deviation can be calculated. This feature eliminates any error otherwise caused by an operator’s manual calculation. TWR-H compares measured turns ratio with the nameplate ratio and prints out the % of error for each test. Transformer winding resistance is determined by injecting DC current through a winding, accurately measuring DC voltage across the winding, and then calculating resistance as the ratio of voltage and current. The device generates true DC ripple-free currents. Both the injection of the current and the discharge of energy from transformer magnetic circuit are automatically regulated.
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Transformer Turns Ratio Meter
TTRM 101
SCOPE introduces state of the art precision single phase Transformer Turns Ratio Meter (TTRM ) designed for field testing as well as factory testing of power transformers, instrument transformers and distribution transformers of all types. TTRM 101 measures only turns ratio where as TTRM 102 along with turns ratio, measures ratio deviation, phase angle deviation, magnetizing current and detects tap-position of single phase transformer in charged switchyard condition. The range of AC voltage selection offers high accuracy in measurement.Both the instrument have in-built TFT display with touch screen and thermal printer. The user friendly, simple instrument makes the testing more easy. With the touch keypad it is possible to enter required DUT information.The ratio results are displayed with % error. Internal non-volatile memory gives the provision of storing test results.Further data can be downloaded to PC or copied to memory stick through USB port provided.
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High Current Transformers
High Current Transformer is designed to elevate and check the temperature of the conductors at high current levels, in order to simulate the current loading conditions found in electrical circuits. High Current Transformer is designed as an open type transformer that uses the test object as its secondary coil or has 1 or 2-turn self secondary winding. The conductors cores' temperature depends on the short-circuit high current caused by the test object. According to the current going through the test object, the test temperature of the conductor will change. The loop temperature is measured by a thermocouple probe which is directly connected to conductor.
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Turns Ratio Testers
TRT Standard Series
When it comes to choosing a transformer turns ratio tester, TRT Standard series offers some of the most advanced instruments with LCD display out in the market. Each model measures transformer excitation current and phase shift performs automatic vector group detection and magnetic balance on three-phase transformers and three-phase autotransformers. Furthermore, they have a built-in true three-phase power source. Because of that, TRT Standard instruments can test transformers with special configurations, such as phase-shifting, rectifier, arc-furnace, traction transformers, etc.The instruments can output test voltages from 1 V AC to 250 V AC, depending on the chosen model. High test voltage of 250 V AC provides more accurate turns ratio testing compared to other turns ratio testers on the market and extremely low test voltage of 1 V AC enables turns ratio verification of current transformers.TRT Standard series consists of:TRT03 Models (TRT03A, TRT03B, TRT03C) – single-phase voltage up to 100 VTRT3x Models (TRT30A, TRT30B, TRT30C, TRT33A, TRT33B, TRT33C) – single and true three-phase voltage up to 100 VTRT63 Models (TRT63A, TRT63B, TRT63C) – single and true three-phase voltage up to 250 VMore about models differences can be found under the downloads tab, in brochures and comparison sheets.A user can create test templates using the DV Win software and store them in the PC’s memory for later use when in the field.TRT Standard series models have a built-in tap changer control unit. Consequently, it enables remote control of an on-load tap changer (OLTC) directly from the tester. In order to make the most out of this feature, the DV-Win software can be programmed to do everything automatically – running turns ratio tests, changing OLTC tap positions and saving results. This option, especially in combination with test templates, significantly facilitates and shortens the turns ratio testing time.
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Current And Voltage Transformer Test Set
iCT1
iCT1 - CT/VT Test Set is the NEW and most advanced portable equipment capable to test current, voltage and combined transformers.With the low voltage method, known as "DC method", iCT1 is able to test Current Transformers with a very high saturation voltage, up to 30 kV, in a complete safety mode. Quick and easy to use tool, iCT1 allows to perform tests in one shot without changing the connection to the CT, thanks to the integrated 5-TAP Switchbox.
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Tap Changer Analyzers & Winding Ohmmeters
Winding resistance test of inductive test objects, such as power transformers, is one of the most effective non-intrusive ways of checking its condition. Due to their advanced design, DV Power winding resistance meters provide high test currents (up to 100 A DC) and high accuracy (up to 0.1%) within light and portable test instruments. In addition to winding resistance measurement, it is also possible to perform simple, quick and reliable transformer on-load tap changer condition assessment by recording the test current during tap changer operation, also known as DVtest. Because of that, problems with a tap changer connection, contacts, and switching procedure can be detected.DV Power winding ohmmeters consist of single-phase RMO-T and three-phase TWA series. Models from the TWA series are designed for six-winding resistance measurement of power and distribution transformers, with only one single-step cable setup. As a result of reducing the total test time, it enables significant saving of time and money.Typical application areas of these instruments are high-voltage substations and industrial environments. They are intended to measure the resistance of:Transformer windingsOn-load tap changersGeneratorsElectrical motorsHigh-current bus bar jointsCable splicesWelding joints
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Digital LOOP/PSC/EARTH Tester
1824 LP
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Measures Earth Resistance without the need for poles in the ground or external measuring wires.● Earth measurement uses the real earth current path and the current generated by the electric network, without the need for any disconnection.● The Earth Resistance displayed is exactly the earth resistance that the earth current will need to go through if an earth fault occurs. (you do not need to add all the bonding points and connection paths)● Displays voltage supply at the transformer(Line to Neutral), without loading the transformer.● Single one smart push button operation; ON, Scroll through results and menus.● Checks wiring integrity (LEDs).● Auto-off / Auto-ranging (software range).● Color-coded test leads.● Combined prospective short circuit current, loop, and earth tester.● Loop test for L-E and PSC between L-N.● Voltage test L-N.● Display can be customized for large orders.
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Current Transformer Field Test Set
1043
The Catalog 1043 Current Transformer Field Test Set is a simple and inexpensive means whereby a current transformer installation may be quickly checked for many sources of trouble. The tests are made without interrupting the Customer's service and while the load is on.
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903 Benchtop Three Phase 40A
Weshine Electric Manufacturing Co., Ltd
1. The instrument has standard four phase voltage and three-phase current output. It can test not only various traditional relays and protection devices, but also various modern microcomputer protections, especially for transformer differential protection and standby automatic switching device. The test is more convenient and perfect.2. Classic Windows XP operation interface, friendly man-machine interface, easy and fast operation; high performance embedded industrial control computer and 8.4 inch resolution 800 × 600 TFT true color display screen, can provide rich and intuitive information, including the current working state of the equipment and various help information.
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Digital Electrical Network Analyzer
1826 NA
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Measures Earth Resistance without the need for poles in the ground or external measuring wires.● Earth measurement uses the real earth current path and the current generated by the electric network, without the need for any disconnection.● The Earth Resistance displayed is exactly the earth resistance that the earth current will need to go through if an earth fault occurs. No need to add all the bonding points and connection paths resistances.● Displays voltage supply at the transformer (Line to Neutral), without loading the transformer. Displays voltage between Line (Phase) and Earth (Ground), without drawing any current.● Measures the impedance of the line itself so you can analyze and differentiate between the multiples paths of the wiring.● Measures the Neutral Impedance. Single one smart push button operation; ON, Test, Scroll trough results and menus.● Checks wiring integrity (LEDs).● Auto off/auto ranging (software ranging). ● Combined prospective short circuit current, loop, individual wire and Earth Tester.● Voltage test L-N and L-E.● Loop test for L-E and L-N and PSC.● Enables analysis of constituent components in L-E and L-N loops giving resistance of earth, neutral wire, live wire and transformer winding.● Display can be customized for large orders.
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Megohmmeter Insulation Tester
AMIC-30
The AMIC-30 insulation tester is a small portable meter designed to measure insulation resistance in electrical and telecommunications installations, cables, motors, transformers and other equipment. The test voltage can be programmed in steps from 10 V to 1000 V. The instrument can measure both insulation resistance over a wide range (0,1kΩ...100GΩ), and insulation leakage current, capacitance and other parameters. All test results can be stored in the internal memory and sent to a computer via the included wireless USB receiver. The meters are supplied with rechargeable Ni-Cd batteries.
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Multifunction Substation Test Set
STS 5000
STS 5000 is a multifunction substation maintenance & commissioning test system for current, voltage and power transformers designed to perform primary tests requested in substations commissioning. It allows to perform accurate tests on CTs, VTs, PTs and ground grid.
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Transformer Ratiometer
TR-1C
Model TR-1C Transformer Ratiometer is a precision test set with an easy-to-read in-line digital readout from 0.00001 to 1.00000, suitable for testing all types of single and three-phase power distribution, potential and current transformers.
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Computer Control 6-Phase Relay Protection Tester
GDJB-PC6
Chongqing Gold Mechanical & Electrical Equipment Co.,Ltd
1.This tester with standard 6 phase voltage, 6 phase current output,2.Voltage 125V/phase, current 30A/phase, 6 phases in parallel can up to 180A.3.Digital Signal Processor Microcomputer.4.Not only test the traditional relays and protectors, but also test the modern micro computer replays, special for transformer differential protection and transfer equipments.
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Step & Contact Meter
HT2055
HT2055 consists in a power unit and a voltmetric unit, necessary for carrying out step and contact voltage measurements in industrial electric installations (TN systems, transformer cabinets) with a rated test current up to 50A.
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Single-Phase Transformer Winding Resistance Meters
RMO-TD Series
Using the most advanced switch-mode technology available today, the RMO-TD series is ideal for winding resistance measurements of inductive objects. Transformer resistance meters and tap changer analyzers are perfect for testing:transformer windings (power transformers, distribution, autotransformers),all types of tap changers,generators,electrical motors,high-current busbar joints,cable splices,and welding joints.In addition, transformer demagnetization can also be done with all RMO-TD instruments.The RMO-TD series contains 3 models, with maximal test currents from 25 A (RMO25TD) to 60 A (RMO60TD).The three independent voltage sense channels enable testing of three windings in series. This enables measurements of winding resistance in every tap position of an on-load tap changer without discharging between the tests.All RMO-TD transformer resistance meters have a built-in tap changer control unit. It enables remote control of on-load tap changer (OLTC) directly from the device. In order to make the most out of this feature, DV-Win software is included which can be programmed to do everything automatically – running winding resistance tests and changing OLTC tap positions.The DV-Win software also enables control and observation of the test process, as well as saving and analyzing the results on a PC. It provides a test report, arranged in a selectable form as an Excel spreadsheet, PDF, Word, or ASCII format. Additionally, DV-Win measures and calculates the OLTC transition time, the ripple and the winding resistance for each tap changing operation. The software can also perform the calculations necessary for the “Heat Run” test.All results can be exported in the report format.
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High Current Calibrator
MC151
MC151 Current calibrator is an accurate current source capable of 120 A. Typical uses include calibration of current sensors, current probes, current transformers, shunts, ammeters, DMMs or as stable current source for test and development applications. The calibrator is equipped with a built-in multimeter that can be used for simulation of programmable transconductance or current amplifier.
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Primary Current Injection Testers
Primary Current Injection Tester is designed for testing protective relay and circuit breakers and also testing the turns ratio of current transformers at high variable currents. A test current is injected into the primary side of a system to determine how the system behaves at particular levels of current. This test makes it possible to determine whether the relay will trip and how long the current needs to flow before the trip is initiated.
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Test Set For Instrument Transformer
This modern Test Set For Instrument Transformer is used for measuring relative errors of Instrument Voltage and Current Transformers. This is developed for reading out the unbalance of any bridge circuit. It also calculates the burden associated to the test sample. In addition to this, it further converts it to ratio and phase error values for presenting them on a LCD screen. With high-tech microprocessor controller, it ensures to provide quick and correct measurements.
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Resistance Measurement
PROMET
High-precision micro-ohm measuring systems with adjustable DC test current for determining resistances on circuit breakers or inductive loads such as transformers, for example. The high-precision ohm meters of the PROMET series are used to determine very low electrical resistances in the µΩ range. The adjustable test current of up to 600 A in combination with a four-wire measuring method delivers measurement results which meet stringent accuracy requirements. State-of-the-art power electronics coupled with a robust design guarantee excellent reliability for use as a portable device in switching stations and industrial environments. Typical applications include determining the contact resistance of switchgear devices and determining the resistance on inductive loads such as transformers.
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Three-Phase Transformer Winding Resistance Meters
TWA Advanced Series
TWA Advanced series is the latest DV Power solution for three-phase transformer winding resistance measurement and tap changer analysis. They are capable of testing six transformer windings with a single cable connection, as well as three-phase automatic transformer demagnetization. It has the option of the automated test mode, where the instrument operates the tap changer without operator input (minimizing the risk of human error) and records winding resistance results based on pre-selected stabilization criteria.The unique DVtest method of tap changer analysis enables checking the moving contacts of on-load tap changers during the transition, measuring the transition time, detecting open circuits, and many other types of faults. It is performed with 0.1 ms sampling rate, together with the measurement of tap changer motor current which detects motor and mechanical issues. A special proprietary algorithm is used for testing tap changers connected through a built-in series (booster) transformer. The DVtest can be performed either on one phase or simultaneously on three phases. It can also be performed together with the winding resistance test in all tap positions.A unique advantage of TWA Advanced instruments is the capability of simultaneously testing the winding resistance of all three phases of a three-phase transformer connected in a YN configuration. This can significantly speed up the testing– for example, it enables the operator to perform 33 measurements instead of 99 on a tap changer with 33 tap positions.TWA500 is equipped with a large 10.1” graphical touch-screen display, while TWA400 has a 7” graphical touch-screen display. Besides making the interface much more user-friendly compared to older winding ohmmeters, it also enables certain test options that were previously available only with DV-Win software. The most important among them are DVtest, tap changer motor current measurement, “Heat Run” test, test templates, and automatic test mode.
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Standard Current Transformer
HL / 640
Wuhan Huatian Electric Power Automation Co., Ltd.
It is used as the calibration standard of current transformer in the error test of transformer.
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High-Voltage Test Device
PGK 110 / 5 HB
BAUR Prüf- und Messtechnik GmbH
Cable testing and diagnostics with the BAUR PGK HB. There are hardly any other longer-lasting, more robust and cost-effective testing devices than the two-piece high-voltage test devices from the PGK HB series. They generate continuous adjustable test voltages with mains frequency or optionally DC with positive or negative polarity. The display instruments for current and voltage, the safety control unit and the regulating transformer for the voltage are integrated in the operating unit.* Testing as DC or Dc testing device* Polarity of the DC voltage can easily be reversed* Robust and durable
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Transformer Power Tester
HDFZ -III
HD Power Test Equipment Co.ltd
HDFZ-III Transformer Power Tester is an multi-function instrument which is used to test accurately a serious of parameters such as capacity, type, no-load current ,no-load loss, impedance voltage of various transformers. The test result of capacity and characteristic can be up to 100% accuracy rate. The capacity measurement range :10kVA~100000kVA。
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Primary Current Injection Testers
Primary current injection tests are carried out during commissioning and certification of various types of switchgear and current transformers (CT), as well as during diagnostics of grounding circuits, testing circuit breakers and other devices. Primary current injection testers can also be used for determining the terminals polarity and transformation ratio of current transformers, thermal testing of electrical devices, testing automatic reclosers and sectional disconnectors.
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Power Calibrator And Protection Relay Test Set
CP11B
Calmet Smart Calibration Devices
Single phase, class 0.02 and 0.05 power quality calibrator up to 120A and 560VAC with programmable power quality parameters. It makes possible to make automatic test of electricity meters, measurement transducers, current transformers and protection relays.
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Power Quality Analyzer
Power quality analyzer is a product carefully developed by our company and specially designed for field test of three phases, multi-functional and intelligent, man-machine operation and concise and comprehensive test instrument. It is easy to use, large LCD screen display, high resolution, interface in both Chinese and English, shock-proof shell structure and so on. Can simultaneously measure the 4-channel current (ABC three phase and neutral wire current), 4-channel voltage (ABC three-phase voltage and neutral line voltage to ground), the peak value of current voltage, maximum/minimum value over a period, three-phase imbalance factor, short-time voltage flicker, transformer K factor, active power, reactive power, apparent power, power factor and displacement power factor, active power, reactive power, apparent power, total harmonic distortion and harmonic, etc; Display real-time waveform, harmonic ratio bar charts of current voltage; Dynamically capture instantaneous change of voltage current, monitoring starting current, monitoring the power parameters and generate the alarm list, generate the trend chart for a long time record test data.
