Transformer Test Equipment

Transformer test equipment has evolved over the years & includes many devices that do various measurements. From winding resistance and turns ratio testers, to Tan Delta & impulse testers.

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15kV Insulation Resistance Meter | MIC15k1
R128,722.00 ex vat

15kV Insulation Resistance Meter - Overview

The MIC-15k1 meter is designed to measure the insulation resistance of power objects up to 15kV, i.e. single and multicore cables, transformers, motors and generators, capacitors, switches, and other devices installed in power stations. It is especially recommended for measurements in areas with very high electromagnetic disturbances, e.g. electrical substations with 1200 kV AC and 500 kV DC. Thanks to the 15 kV measuring voltage (in accordance with ANSI / NETA ATS-2009 TABLES 100.1) the meter can be used for measuring objects with a nominal voltage above 34.5 kV.

15kV Insulation Resistance Meter - Features
- Diagnostics of insulation systems based on standard measurements of IR, DAR, PI, SV, RT, and DD, widened with the partial discharge (PD) indicator for each of these measurements
- Testing the electrical durability of tested object - breakdown voltage indication
- High resistance to electromagnetic interferences - uninterrupted work in power stations & close to high voltage transmission lines up to 1200 kV AC & 500 kV DC
- Smooth voltage rise in time function (RT - Ramp Test) - state the partial discharges in the facility and carry out a partial location of their occurrence
- Efficient converter with a power of ~150 W enables insulation burnout, allowing for pinpointing the location of cables and wires short circuit using one of the following:
  - visual method (if power cables are visible along the entire length)
  - reflectometric methods, seismic-acoustic waves detector, or with A-frame to indicate the direction of the fault (the conductor must be buried in the ground with earth direct contact)
- Compatible with external software
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Mega Ohm Meter | MIC-10
R10,492.00 ex vat

Mega Ohm Meter - Overview

The MIC-10 meter is designed to perform electrical tests, which establish the safety of insulation in systems. This is a very handy digital multimeter tool, measuring insulation resistance up to 10GOhms with up to 1000V measuring in accordance with IEC61557-2.

Mega Ohm Meter - Features
- Continuous indication of insulation resistance or leakage current
- Select test voltages of: 50, 100, 250, 500, 1000 V
- Automatic discharge of capacitance of tested object after the insulation resistance measurement
- Acoustic signalling of five-second periods to facilitate obtaining time characteristics
- Indication of actual test voltage during the measurement
- Protection against measuring live objects
- Three-lead measurement
- Continuity measurement of protective and equipotential conductors according to EN 61557 - 4 with >200 mA current
- Low-voltage circuit continuity and resistance measurement
- Circuit resistance measurement (<1999 ) with the <15 mA current
- Sound signal if circuit resistance is below 30Ω
- Capacitance measurement during the R_ISO measurement
- Measurement of alternating and direct voltages in the 0...600 V range
- Power supply: 4 AA disposable or rechargeable batteries, monitoring of power supply voltage
- Meter conforms to EN 61557
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10kV Insulation Resistance meter up to 40 Tera-Ohm | MIC10k1
R94,201.00 ex vat

10kV Insulation Resistance meter - Overview

This insulation resistance meter has a digital filter function for measurements in a high-noise environment. Continuity measurement of protective connections and equipotential bonding in accordance with EN 61557-4 with current > 200 mA. Adjustable limits for measured resistance R_ISO and R_CONT. Measurement of leakage current during insulation resistance testing. DC and AC voltage measurement in the range of 0...750 V. Drawing graphs on the display during measurement. Innovative memory with the option to describe measurement points, facilities, and names of customers. Can be operated with a mini Bluetooth keyboard (optional). Stable measurements in noisy environments such as 765 kV substations. Graphic LCD 5,6'’ backlit display. Keyboard backlit. Power supply from battery packs. Built-in fast charger. The instruments meet the requirements of the EN 61557 standard.

10kV Insulation Resistance meter - Features
- clear visible display
- measurement voltage in the range of: 50…10000 V (50...1000 V at 10 V and 1...10 kV at 25 V)
- continuous indication of measured insulation resistance or leakage current
- automatic discharge of measured object capacitance voltage after the end of insulation resistance measurement
- acoustic signalling of 5 seconds intervals to facilitate capturing time characteristics
- adjustable measuring time to 99'59'’
- metered T₁, T₂ and T₃ test times for measuring one or two absorption coefficients from the range of 1…600 s
- polarization index (PI), absorption coefficients Ab1, Ab2 and dielectric absorption ratio (DAR) measurement
- indication of actual test voltage during measurement
- 1.2 mA, 3 mA and 5 mA test current
- insulation resistance measurement using two- or three-wire method
- measurements with test leads up to 20 m
- protection against measuring live objects
- automatic measurement of multiple core cables with the additional AutoISO-5000 adapter (for MIC-10k1 max. voltage 5 kV)
- measurement of capacitance during the measurement of R_ISO
- measurement of temperature (with additional probe - WASONT1)
- step voltage insulation resistance measurement (SV)
- Dielectric Discharge calculation (DD)
- location of damage (burnout)
https://www.youtube.com/watch?v=ibX7f55ngzc

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Insulation Resistance Meter 5kV | MIC-5050
R58,702.00 ex vat

Insulation Resistance Meter 5kV - Overview

This insulation resistance meter has a digital filter function for measurements in high-noise environments. Continuity measurement of protective connections and equipotential bonding in accordance with EN 61557-4 with current > 200 mA. Adjustable limits for measured resistance R_ISO and R_CONT. Measurement of leakage current during insulation resistance testing. DC and AC voltage measurement in the range of 0...750 V. Graphs on the display during measurement. Innovative memory with the option to describe: measurement points, facilities, and names of customers. Bluetooth keyboard (optional). Graphic backlit LCD 5,6'’. Keyboard backlit. Power supply from a main power line or battery packs. Built-in fast charger. The instruments meet the requirements of the EN 61557 standard.

Insulation Resistance Meter 5kV -Features
- measurement voltage any in the range of 50...5000 V (50...1000 V at 10 V and 1...5 kV at 25 V)
- continuous indication of measured insulation resistance or leakage current
- automatic discharge of measured object capacitance voltage after the end of insulation resistance measurement
- acoustic signalling of 5 seconds intervals to facilitate capturing time characteristics
- adjustable measuring time to 99'59'’
- metered T₁, T₂ and T₃ test times for measuring one or two absorption coefficients from the range of 1…600 s
- polarization index (PI), absorption coefficients Ab1, Ab2 and dielectric absorption ratio (DAR) measurement
- indication of actual test voltage during measurement
- 1.2 mA, 3 mA and 5 mA test current
- insulation resistance measurement using two- or three-wire method
- measurements with test leads up to 20 m
- protection against measuring live objects
- automatic measurement of multiple core cables with the additional AutoISO-5000 adapter
- measurement of capacitance during the measurement of R_ISO
- measurement of temperature (with additional probe - WASONT1)
- step voltage insulation resistance measurement (SV)
- Dielectric Discharge calculation (DD)
- location of damage (burnout)
https://www.youtube.com/watch?v=DyOH7K4Yoqg

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Cropico DO7 Micro-Ohmmeter
R73,021.00 ex vat
DO7 Micro-Ohmmeter - Overview

The DO7 digital micro ohmmeter is a practical instrument for low resistance measurement, ideal for utility use in the workshop, field or test facilities. It is of rugged construction, contained in a sealed ABS plastic case with lid and carrying handle. The DO7 digital micro ohmmeter has many advanced features. Rechargeable batteries mean real portability with more than 1 hour of continuous operation on the lowest ranges(10A), and 20 hours on all others. The internal charger will boost the charge to 90% of full charge, switching automatically to a trickle maintenance charge. Warning LEDs illuminate when an open circuit lead condition is detected.

DO7 Micro-Ohmmeter - Features
- True 4 terminal measurement eliminates lead resistance errors
- 10A measuring current
- Rechargeable batteries with built-in charger
- Measuring ranges 600µΩ to 60Ω
- Resolution 0.1µΩ on 600µΩ range
- 0.8” LED display daylight viewable
- Auto average of forward and reverse measurement
- Remote start socket
- All solid state design
- Wide range of leads and accessories available
- RS232 printer output
- Protection up to 415Vrms at the measuring terminals,
- Digital calibration and long scale length
- 6,000 count
https://www.youtube.com/watch?v=12vpdn6h-XM

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MIC-2501 Insulation Resistance Tester/Meter
R18,539.00 ex vat
MIC-2501 Insulation Resistance Tester/Meter - Overview

A very handy tool for measuring Insulation resistance with up to 2500V. It can measure up to 1TOhms in accordance with IEC61557-2. Comes with a convenient carry case which has straps to free up your hands during operations.

MIC-2501 Insulation Resistance Tester/Meter - Features
- Selectable voltage in the 100…2500 V range with 100 V step
- Continuous indication of insulation resistance or leakage current
- Automatic discharge of capacitance of tested object after the insulation resistance measurement
- Acoustic signalling of five-second periods to facilitate obtaining time characteristics
- Measured test times T₁, T₂ i T₃ to measure one or two absorption coefficients in 15, 60 and 600 s
- Indication of actual test voltage during the measurement
- Protection against measuring live objects
- Two and three-lead measurement methods
- Continuity measurement of protective and equipotential conductors according to EN 61557-4
- Leakage current measurement
- Alternating and direct voltages in the 0...750 V range
- Built-in rechargeable battery pack
- The instruments meet the requirements of the EN 61557 standard
- Charge from car lighter (12 V) socket (additional accessories)
https://www.youtube.com/watch?v=ZKKcoVvN-B8

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SFRA Sweep Frequency Response Analyzer | SFRA45
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SFRA Sweep Frequency Response Analyzer - Overview

This Sweep Frequency Response Analyzer with a bandwidth of 5Hz to 45MHz offers a fully portable solution which fully complies with IEC60076-18 – Power Transformers Part 18 – Measurement of frequency response. Featuring a built-in colour LCD screen and is battery powered. The tablet style instrument has the ability to perform most the common sweep frequency response analysis technique “Fingerprint Comparison” as well as all other comparison techniques, with or without PC Software. The dedicated software available (SFRAComm) also enables the user to create databases from which historical transformer sweeps can be recalled and compared to current sweeps for analysis.

There are Four occasions when SFRA is performed
1. Upon factory quality checking
2. Before a short circuit test
3. Before and After transportation
4. Ongoing scheduled maintenance
SFRA Sweep Frequency Response Analyzer - Features
- Full Colour LCD VGA Display view comparison on the spot
- Frequency range 5Hz to 45MHz
- Gain Accuracy 0.02dB
- Phase Accuracy 0.05°
- RS232, LAN and USB
- PC Software package included
- 2Hr Battery Life
- Leading Phase Accuracy
- Truly Portable Measurements
- LCR Mode
- Save Data to external USB
- 50Ohm or High Impedance Input
- Scope Function
- Save Data to Database for comparison
- Supplied with all accessories and carry case
Datasheet

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Winding Single Phase Resistance Meters | RMO-TT
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Winding Single Phase Resistance Meters - Overview

The RMO-TT series is designed for winding resistance measurement of inductive objects. It uses advanced switch-mode technology. It is an accurate (0,1% rdg + 0,1% F.S.), and powerful portable instrument (up to 100 A). It generates a true DC ripple-free current with automatically regulated measurement and discharging circuit. It can perform simple, quick and reliable transformer on-load tap changer condition assessments. This series enables measurements of a winding resistance in every tap position, current ripple values and transition times during the tap changes. Problems with the connection, contacts, and selector/diverter switch operation can be detected with these measurements. It is equipped with thermal and overcurrent protection. It has the ability to cancel electrostatic and electromagnetic interference that exists in HV electric fields. This is achieved by a proprietary filtration solution applied to both the hardware construction and the application software implementation. Applications include: winding resistance measurement of inductive test objects; dynamic resistance measurement (DVtest) of on-load tap changers; measurement of on-load tap changer motor current by using a dedicated channel; heat run test, which enables obtaining the Hot Spot temperature along with resistance graph during the cooling process 1; and single-phase automatic transformer demagnetisation.

Winding Single Phase Resistance Meters - Features
- On-load tap changer dynamic resistance measurement
- Three resistance measurement channels
- Four temperature measurement channels
- Vibration measurement channel
- Tap changer motor current monitoring channel
- Automatic measurement for the Heat Run test
- Rapid automatic demagnetisation
- Automatic discharge circuit
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Turns Ratio Tester | TRT Advanced Series
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Turns Ratio Tester - Overview

TRT advanced series are true three-phase, fully automatic test devices specially designed for turns ratio, phase shift, and excitation current measurements of power, distribution, and instrument transformers. It determines the transformer turns ratio by applying voltages across high-voltage windings, accurately measuring voltages across the unloaded transformer windings, and then displaying the ratio of these voltages. 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 IEC 60076-1 standard. It has a very high ability to cancel electrostatic and electromagnetic interference in HV electric fields.

Turns Ratio Tester - Features
- Automatic vector group detection
- Built-in tap changer control unit
- Interchangeable test leads with Three-phase Winding Ohmmeters & Tap Changer Analysers TWA Series
- Single-phase test voltages up to 500 V AC
- True three-phase test voltages up to 3x290√3V AC
- Up to 5 kV AC with additional CVT20 for testing capacitive voltage transformers
- The best turns ratio accuracy of 0.03% • Large 10.1” or 7” graphical touch screen display
https://www.youtube.com/watch?v=V8ktNqs6SPE

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Winding Resistance Meters Single Phase with DRM | RMO-TD Series
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Winding Resistance Meters Single Phase with DRM - Overview

The RMO-TD series is designed for winding resistance measurement of inductive objects. It is based on the most advanced switch-mode technology available today. It is accurate (0,1% rdg + 0,1% F.S.), and powerful (up to 60 A). It generates a true DC ripple-free current with automatically regulated measurement and discharging circuit. It can perform simple, quick and reliable transformer on-load tap changer condition assessments. This series enables measurements of a winding resistance in every tap position, current ripple values and transition times during the tap changes. Problems with the connection, contacts, and selector/diverter switch operation can be detected with these measurements. It is equipped with thermal and overcurrent protection. It has a high ability to cancel electrostatic and electromagnetic interference that exists in HV electric fields. This is achieved by a proprietary filtration solution applied to both the hardware construction and the application software implementation.

Winding Resistance Meters Single Phase with DRM - Features
- On-load tap changer (OLTC) dynamic resistance measurement DVtest
- Three measurement channels
- One temperature measurement channel
- Tap changer motor current monitoring channel
- Built-in tap changer control unit
- Automatic resistance measurement for the Heat Run test
- Rapid automatic demagnetisation
- Automatic discharge circuit
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Handheld Winding Ohm Meter | RMO-TH Series
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Handheld Winding Ohm Meter - Overview

The handheld winding ohm meter device is a DV Power single-phase instrument specially designed for measuring transformer winding resistance and performing transformer demagnetisation. 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 the transformer magnetic circuit are automatically regulated. The instrument has two output DC sources for measuring transformer winding resistance. The first DC source can output a maximum of 2 A DC and is designed for injecting current into the transformer’s high-voltage winding. The second DC source can output a maximum of 10 A DC and is designed for testing the transformer’s low-voltage winding. Having two separate DC sources is especially useful when measuring the winding resistance of distribution transformers. These transformers have a large turns ratio. Because of that, the difference between resistances of high voltage and low voltage windings is very big. This requires different levels of test currents for high-voltage and low-voltage windings. Applications include: winding resistance measurement of distribution and instrument transformers, motors, and generators, and demagnetisation of distribution and instrument transformers, motors, and generators.

Handheld Winding Ohm Meter - Features
- Two Output DC Sources
- Memory
- DV-TR Software
- Internal Li-Ion battery
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Three-Phase Transformer Turns Ratio Tester | TRT Std Series
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Three-Phase Transformer Turns Ratio Tester - Overview

The TRT Standard series offers advanced instrumentation which includes LCD displays. Each model measures transformer excitation current and phase shift and performs automatic vector group detection and magnetic balance on three-phase transformers and three-phase autotransformers. They have built-in true three-phase power sources which equip test transformers with special configurations, such as phase-shifting, rectifiers, arc-furnace, traction transformers, etc. The instruments can output test voltages from 1 V AC to 250 V AC, depending on the chosen model. A high test voltage of 250 V AC provides more accurate turns ratio testing compared to other turns ratio testers on the market, with an extremely low test voltage of 1 V AC enables turns ratio verification of current transformers. Applications include: turns ratio measurement, turns ratio deviation calculation, excitation current measurement, phase angle measurement, automatic vector group detection, verification of demagnetisation process and magnetic balance testing.

TRT03 Models (TRT03A, TRT03B, TRT03C) – single-phase voltage up to 100 V
TRT33 Models (TRT33A, TRT33B, TRT33C) – single and true three-phase voltage up to 100 V
TRT63 Models (TRT63A, TRT63B, TRT63C) – single and true three-phase voltage up to 250 V

Three-Phase Transformer Turns Ratio Tester - Features
- True Three-Phase Test Voltage TRT (except TRT03)
- Highest accuracy for turns ratio, excitation current, and phase angle
- High measurement resolution
- Interchangeable cables with TWA
- Automatic Vector Group Detection
- Built-in Tap Changer Control Unit
- DV-TR software is included
- Magnetic Balance Test
- Memory store 200 test records. Each consists of 50 test readings
- USB Flash Drive
- Optional Built-in Printer
https://www.youtube.com/watch?v=aUJ0BNudhI4&t=17s

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Winding Resistance and Turns Ratio Meter | MRC7300A
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Winding Resistance & Turns Ratio Meter - Overview

This instrument can precisely and safely determine winding resistances, transformation ratios, and phase angles of distribution transformers up to 100MVA and more. Further, it is possible to automatically move the tap charger of the H.V. winding to the next tap and perform cool-down measurements in temperature rise tests to calculate the resistance in the case of a load disconnection. The Winding Resistance & Turns Ratio Meter MRC7300A can be used by transformer manufacturers, electricity supply companies, and repair companies which carry out on-site measurements under unfavourable conditions. Resistance values ranging from 50 µΩ to 500 µΩ can easily be measured and logged with the internal measuring current of a maximum of 15 A up to a power of Approx. 100 MVA and more. To allow a comparison of the measured values to previous measurements, a conversion of the temperature of the test object is provided to compare measurements of a detached transformer carried out in winter and measurements carried out in other seasons. The measuring range is between 0.9:1 and 2500:1 in the case of the transformation ratio; the resolution of the angle measurement is 0.1 degrees. The logging of all measured values is performed by a separate printer, computer, or via the internal memory. The magnetic loading of the transformer is performed quickly to a relatively high rating voltage (50V). The unloading of the core is very safe, as the energy is dissipated in the MRC7300A by a ballast resistor and varistors except for a negligible rest.

Winding Resistance and Turns Ratio Meter- Features
- Automatic measurement without any manual interaction
- Resistance measurement with high accuracy and up to 15 A current
- Ratio measurement including phase angle and magnetizing current
- Dual measuring method for faster measurements
- Automatic vector group detection
- Tap changer control measures all transformers tap automatically
- Heat-up measurement including an algorithm for resistance at t=0
- Temperature measurement and compensation to 20 °C for Cu or AI
- USB port to get full external control over the instrument
- Thermo printer
Datasheet

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Battery Operated Transformer Ratio Meter | PWR1-3B
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Battery Operated Transformer Ratio Meter - Overview

The Battery-Operated Transformer Ratio Meter PWR1-3B is a battery-powered instrument that can also be driven by normal line voltage. It is designed to measure transformation ratio, phase error, and magnetizing current of power and distribution transformers for all three-phases simultaneously. Voltage and current transformers are single-phase, power transformers normally are three-phase. Due to the bad quality of industrial lines (phase jitter and shifting, voltage differences between the three phases) all measurements normally are done in single-phase, even on three-phase ratiometers. The design of the PWR1-3B contains an internal sinus power oscillator which delivers the necessary exciting voltage with very low distortion and stable voltage not found in industrial lines. This allows for very stable and precise single and three-phase measurements. The Battery-Operated Transformer Ratio Meter uses a large LCD display with a backlight to present the values of ratio and phase difference of “H.V. Winding” to “L.V. Winding”, and the excitation voltage and the magnetizing current of the high voltage winding. Additionally, the instrument performs self-calibration and has different warning messages before each measurement in case of reversed connections and other failures.

Battery Operated Transformer Ratio Meter - Features
- Ratio range from 8 to 2,500
- Fully automated measurement
- Measuring voltage 10 V / 100 V selectable
- The display shows:
  - Ratio
  - Phase-angle
  - Excitation voltage
  - Magnetizing current
- Easy to read large LC display for all three-phases with backlight
- Built-in printer (optional)
- A robust mobile case for field use
Datasheet

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Winding Resistance Transformer and Motor Meter | MR 8050
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Winding Resistance Transformer and Motor Meter - Overview

The MR8050 can measure highly inductive windings of transformers, motors, and reactors with a range of 100µΩ with 0.01µΩ resolution up to 6kΩ. The performance of the measured objects can be up to 800MVA or even more. The magnetic loading of a transformer is performed quickly using a high loading voltage (60V), this is important for time-critical measurements (cooling curves). The unloading of the transformer's core is fast and safe, as the energy is dissipated in the MR8050. The temperature of the measured objects can be pre-set or measured using a PT100 temperature sensor and the resistance is calculated for 20°C using the temperature coefficient for copper or aluminum heat-loss measurements. The resistance at t=0 (disconnection of load) is shown as a result of the internal regression algorithm. Two windings (mostly HV and LV) can be measured simultaneously in the DUAL measuring method. The MR 8050 also features automatic tap-changer control for measuring different taps without interrupting the measuring current.

Winding Resistance Transformer and Motor Meter - Features
- 2 channels for DUAL measurements
- Measuring time short due to very fast uploading
- Discharge time 1/10 of uploading time
- Heat - loss measurements with regression algorithm
- LCD-Display with 240 x 128 pixels with backlight
- USB standard and RS232C 9600 baud
- PT100 connector for PT100 temperature probe
- Tap changer connector for automatic tap control
- Warning system connector for a separate warning light
- Internal test storage for up to 1000 measurements
- Inputs full protected against static and transient voltages
- Wide current ranges from 50mA to 60A
Datasheet

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