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Transformer Testing

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Turns Ratio and Winding Resistance Analyser | TWR-250B

Turns Ratio and Winding Resistance Analyser - Overview

This analyser is battery-operated and is designed for measuring transformer winding resistance and turns ratio. It is capable of testing six transformer windings with a single cable connection, as well as three-phase automatic transformer demagnetisation. It has the option of automated test mode, where the instrument operates the tap changer without operator input (minimising the risk of human error) and records winding resistance and turns ratio results based on pre-selected criteria. This also measures excitation current and phase shift. This enables detecting transformer core or winding turns failures which cannot be spotted by measuring turns ratio only. It has a built-in true three-phase power source so it can test transformers with special configurations, such as phase-shifting, rectifiers, arc-furnace, traction transformers. The instrument can output test current up to 25 A DC for winding resistance tests and voltage up to 250 V AC for turns ratio tests, but it can also output a very low-test voltage of 1 V AC, which is necessary for turns ratio verification of the majority of current transformers. It has a large 10.1” graphical touch-screen display with test templates and automatic test mode. Users can create test templates, store and load them with just a few clicks.

Turns Ratio and Winding Resistance Analyser - Features
- Winding resistance measurement
- Demagnetisation
- Turns ratio measurement
- Turns ratio deviation calculation
- Excitation current measurement
- Phase angle measurement
- Automatic vector group detection
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Transformer Edition Power Analyzer | PPA5500-TE

Transformer Edition Power Analyzer - Overview

The PPA5500-TE provides unrivalled measurement integrity, reliability and accuracy. Each and every PPA5500-TE is rigorously tested within N4L’s ISO17025 Accredited Power Laboratory in which specialised power calibration from 40Hz to 450Hz is performed alongside N4L’s well-documented wideband calibration, up to 2MHz. The PPA5500-TE is compliant to IEC60076-8 and provides a 3-year warranty as well as a 2-year calibration interval. Power Transformer loss analysis becomes challenging when the transformer is off-load (for example whilst performing core loss analysis), this test condition requires the power analyzer to exhibit exceptional phase angle accuracy and repeatability. The PPA5500-TE provides market-leading low power factor analysis, supplied with UKAS ISO17025 certification.

Transformer Edition Power Analyzer - Features
- 0.07% Nominal Power Accuracy
- 0.55% Power Accuracy at PF=0.01
- 0.003° Phase accuracy
- Widest Voltage, Current and Frequency range in the market
- Unrivalled Performance, Unquestionable Traceability
Datasheet

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Winding Single Phase Resistance Meters | RMO-TT

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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Precision Power Analyzer | PPA5500

Precision Power Analyzer - Overview

The PPA5500 Power Analyzer is a compact, cost-effective, leading power measurement performance instrument. It has exceptional accuracy and stability in the most demanding of power applications. The Power Analyzer 5500 series extends the power analysis range for those who require the ultimate power analysis product.

The PPA5500 adds increased voltage and current measurement ranges, greater processing power, increased memory, a real-time clock, high contrast visible colour display, 1GB non-volatile internal memory, external USB memory port, wide frequency range and exceptional noise rejection. A 2MS/s sample rate, alongside “True Real-Time” no gap analysis is a formidable combination for power analysis. The analogue front-end design includes the proprietary "Planar shunt technology". This instrument provides exceptional measurement stability and accuracy. The phase angle accuracy of the PPA5500 is 0.005 degrees which are perfect for transformer loss analysis testing at very low power factors.

Precision Power Analyzer - Features
- 0.01% Basic accuracy
- Frequency range DC and 10mHz to 2MHz
- High precision internal shunts Superior accuracy to any external shunt
- 5 millidegree phase accuracy necessary for low power factor applications
- Up to 50 Arms (1000 Apk) & 1000 Vrms (3000 Vpk) direct input
- Low current (10Arms), Standard (30Arms), and High current (50Arms) options
- High-speed sampling on all channels
- True real-time analysis with no measurement gap
- 1, 2, or 3 phase versions master-slave mode for 4, 5, or 6 phase
- Real-time Digital, Tabular, Graphic, and Oscilloscope displays
- Simple BNC connection of N4L shunts for high-current applications
- RS232, IEEE 488, USB, LAN, Torque, Speed and Extension ports
https://www.youtube.com/watch?v=ntKljPrXvYM

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Single Phase Winding Resistance Meters | RMO-TW Series

Single Phase Winding Resistance Meters - Overview

This series is ideal for measuring the winding resistance of inductive objects. It is perfect for testing transformer windings (power transformers, distribution, autotransformers) and for on-load tap-changer verification. In addition, it can also perform transformer demagnetisation. The series contains 4 models, with maximal test currents from 10 A (RMO10TW) to 50 A (RMO50TW). They are fitted in a portable and lightweight metal housing. Rack-mount available on request. It generates a true DC ripple-free current with an automatically regulated measurement and discharging circuit. The injection of current and discharge of energy from the test object is automatically regulated. Three independent channels enable the testing of three windings in series. Consequently, this enables measurements of winding resistance in every tap position of an on-load tap changer without discharging between the tests. The software enables control and observation of the test process, as well as saving and analysing the results on a PC. It provides a test report, arranged in 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.

Single Phase Winding Resistance Meters - Features
- Test Voltage up to 55 V DC
- Simultaneous Three-Channel Winding Resistance Measurement
- On Load Tap Changer Verification
- Transformer Demagnetisation
- DV-TR Software
- Heat Run Test Application
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Winding Resistance and Turns Ratio Meter | MRC7300A

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

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

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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Three Phase Transformer Measuring Bridge | MLS 7100

Three-Phase Transformer Measuring Bridge - Overview

The MLS 7100 was particularly designed to simplify the determination of transformer core and copper losses, which is an ideal choice when working on site. The measuring bridge features open-circuit as well as short-circuit measuring. Many transformers can be directly connected to the MLS 7100 without needing further transducers. Core losses are an important transformer quantity in electrical efficiency, operating expenses, and the overall transformer value.

Steel losses are typically determined using open-circuit measurement, as a relatively small magnetising current is flowing. Using this technique, the copper losses are minimized due to the square correlation of power and current. Copper losses are determined using short circuit measurement, as the magnetising modulation of the steel core should be minimized. In addition, the short circuit voltage is determined this way, which is also an important quantity.

Three Phase Transformer Measuring Bridge - Features
- Open circuit measurements
- Short circuit measurements
- Free selectable voltage and current dividers
- 1000 kV with transducer
- 1000 kA with transducer
- 550 V (chained) 6 A directly connectable
- Measures and displays:
  - Voltages
  - Currents
  - Power
  - Short Circuit Values
  - Frequency
- Centronics printer port
- RS232C port for external control
Datasheet

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Three-Phase Transformer Turns Ratio Tester | PWR3A

Three-Phase Transformer Turns Ratio Tester - Overview

The great advantage of the Three-Phase Transformer Tester PWR3A is its simple set-up. You simply type in the vector group with the keys to set up, connect the transformer to the device, and release the measurement. All three phases are measured consecutively. All connecting and short-circuited procedures at the primary and secondary voltage sides are performed automatically before each measurement. It is also possible to measure just one phase. An adjustable set value allows an error or deviation of the measured transformation ratio to be displayed. Automatic control of the tap changer is provided. All phases and taps are measured consecutively, and the results are stored inside the instrument and transferred to a PC. The transformer-specific data can be easily programmed via a connected PC but it is also possible via the internal keyboard. The PWR3A is connected to the H.V. and L.V. sides via four connections each. It also powers the test object at a selected voltage, supplied by an internal isolating transformer. An external excitation using different voltages and frequencies is also possible.

Three-Phase Transformer Turns Ratio Tester - Features

• Ratio range from 0.75 to 20,000 (higher ratios with CVT-Ext.)
• Fully automated measurement
• Features market unique Vector Group Detection
• Measuring voltage from 8 V to 230 V
• Measuring voltage up to 5 kV by CVT-Extension: PWR3A-CVT
• Using 3-phase voltage for phase angles other than 0°/180°
• Easy to handle tap changer automatic
• Internal memory stores all dates (Reading with PWR3A-XFER)
• LC display (256 x 128 pixel) with backlight
• Easy input of vector group and measuring conditions
• USB/RS232C port to get full instrument control
• Centronics printer port or built in printer (optional)
• Robust mobile case for field use
• Factory Certificate

Datasheet

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