CT Tester (Field Tester)

MOEORW-W8050W CT Tester (Field Tester)

The MOEORW-W8050W ct field tester is a high-precision field tester for current transformers, specifically designed for the calibration of power transformers.

It offers precise testing, convenient operation, and a built-in current source, enabling efficient verification of equipment accuracy and performance.

It is suitable for substations, power distribution rooms and other places, and meets the needs of on-site verification, acceptance, operation and maintenance testing.

The MOEORW- W 8050W current transformer field tester employs the internationally recognized and most advanced load current extrapolation method, which boasts the highest reliability and anti-interference capability among extrapolation methods. Utilizing high-power automatic source and electronic load box technology, it can directly measure the error of small-ratio transformers, and extrapolate the error of large-ratio transformers using current data below 20%. It can also accurately determine the magnetic margin of the current transformer (CT). Internal standards, calibrators, and load boxes are traceable, making it an ideal field test tool for current transformer errors and magnetic margins in the power sector. Feedback from numerous users confirms its excellent error accuracy and anti-interference performance.

This instrument uses a large-screen grayscale LCD display with a resolution of 640*480, which provides clear display, a user-friendly interface, and convenient operation. Errors at various points can be displayed on the same screen, and all operations can be easily completed.

I. Functional Parameters

• Test range: 5-5000/1A, 5A, standard ratio can be automatically switched.
• Secondary load under test: 1-60VA, any volt-ampere value can be input (power factor > 0.5)
• Measurable accuracy class: Suitable for on-site verification of current transformers with an accuracy class of 0.2S and below.
• Power booster: Automatic power booster up to 3kVA
• Accuracy of built-in metering devices: 0.05S class for standard current transformers, 2 class for transformer calibrators, and 3 class for current load boxes (all can be metered and transferred independently).

II. Accuracy and Error Parameters

• Overall test uncertainty: ratio error 0.05%, angle error 2 minutes
• Error limits for each test point (Appendix A standard):

III. Environmental Parameters

• Ambient temperature: -5℃ ~ 45℃
• Relative humidity: ≤85%
• Operating power supply: AC220V±20%, 50Hz±2% (waveform distortion <5%)
• Electromagnetic requirements: The power supply must be free from electrical pulse impacts, and there must be no unrelated strong magnetic fields in the surrounding environment.

IV. Hardware and Display Parameters

• Monitor: 640*480 resolution large-screen grayscale LCD monitor
• Data interfaces: RS232 (computer transmission), USB (USB flash drive data download)
• Storage capacity: Capable of storing massive amounts of error test data.

V. Terminal block parameters

• Primary terminals: available in three ranges: 5000A-500A, 400A-50A, and 40A-5A (corresponding to the primary P2 terminal of the CT under test).
• Polarity terminals: P1 (primary polarity), S1I/S1U (secondary polarity), S2I/S2U (secondary wiring)
• Verification terminals: Tx, K, To, D (internal calibrator and load cell calibration)
• Standard terminals: S1, S2 (secondary terminals of internal current standard)

1) The error curve of the current transformer is extrapolated using the load error method.

2) For CT scans of 500A and above, 20% or less use the traditional differential measurement method.

3) For a CT with a secondary current of 1A and a load of 30VA or more, the traditional differential measurement method is used for 20% and below .

4) It can ensure good test accuracy under complex electromagnetic interference conditions.

5) It can accurately test nonlinearly compensated through-hole type small current transformers. For transformers below 500A, the traditional differential measurement method can be used directly.

6) Test range 5-5000/1A, 5A, standard ratio automatic switching, test process is fully automatic.

7) The current transformer with an unknown ratio can automatically test the ratio.

8) It can automatically test the actual load of the current transformer.

9) The secondary load of the current transformer under test is 1-60VA, and any volt-ampere value can be input . The power factor must be greater than 0.5.

10) The overall test uncertainty reaches: ratio error 0.05% and angle error 2 minutes, which is suitable for on-site verification of current transformers of 0.2S class and below.

11) The magnetic margin of the current transformer can be tested according to the provisions of JJG1021-2007, which is 150%.

12) It can automatically demagnetize current transformers.

13) The built-in current transformer calibrator (level 2), current load box (level 3), and standard current transformer (level 0.05S) can be used for metering transfer independently.

14) The automatic current booster power source can reach up to 3kVA.

15) It can store massive amounts of error data and has a dedicated interface to download data directly to a PC, or download data to a USB flash drive via the USB interface on this device.

Suitable for power operation and maintenance sites, it can perform ratio, error, polarity and load detection on various indoor and outdoor current transformers, and quickly verify whether the equipment accuracy meets the standards.

It can be used in substations, power distribution rooms, power supply stations and other places to complete the daily inspection, periodic verification and fault diagnosis of current transformers.

It is suitable for power construction units to conduct on-site commissioning and acceptance testing of newly installed or replaced current transformers to ensure that the equipment is put into operation in compliance with regulations.

It can be used in conjunction with metrological verification work to conduct on-site metrological verification and accuracy calibration for current transformers with an accuracy of 0.2S and below .