Transformer On-load Switch Tester

Product Introduction

The On-Load Tap Changer Tester is designed in accordance with the General Technical Conditions for High-Voltage Test Equipment (DL/T 846-8-2004) of the Power Industry Standard of the People's Republic of China. It meets the requirements specified in the "Code for Acceptance and Preventive Tests of Power Equipment" for inspecting the operating sequence of on-load tap changers and measuring switching times. It enables precise measurement of parameters including transition time, transition waveform, transition resistance, and three-phase synchronism for on-load tap changers, making it an ideal testing device. (Users with tap-changing on-load switches should notify us in advance.)

Product Parameter (specification)

Three-phase constant current charging, charging current	3A/1A range; 0.6A/0.2A range
Maximum port voltage	24V
Maximum transition resistance range	100Ω
Transition resistance measurement range	1A range;0.4Ω to 20Ω; 0.2A range;10Ω to 100Ω
Waveform recording duration	300ms
Sampling rate	30k
Time resolution	0.1ms
Resistance resolution	0.1Ω
Accuracy	Transition resistance;±5% of reading ±0.1Ω Transition time;±0.5% of reading ±0.2mS
Operating temperature	-10 to 40°C
Operating relative humidity	<85%RH

Product feature and application

1. Tests Y0, Y, and Δ-type transformers with resistance values displayed directly without conversion;

2. User-friendly data analysis automatically identifies faults within waveforms and marks them;

3. Waveform display automatically adjusts resistance and time scales based on sampled data;

4. △-type transformers can display three-phase synchronism;

5. Instrument automatically distinguishes single-resistor and dual-resistor configurations;

6. Testing possible with or without windings attached;

7. Four-terminal wiring provides high-precision resistance measurement without wire compensation;

8. Continuous testing during operation minimizes transformer downtime;

9. Instrument saves Word reports for convenient data management and retrieval;

10. Instrument controlled by a compact computer with an external 800×480 color LCD touchscreen, high-speed printer, and external mouse support for user-friendly operation;

11. Internal storage for 1000 data sets with optional external USB flash drive backup.

Prodection details

Suitable for on-load tap changer acceptance and preventive testing in the power industry, this equipment enables precise measurement of transition time, transition waveform, transition resistance, and three-phase synchronism parameters for on-load switches of Y0, Y, and Δ-connected transformers during de-energized conditions. It supports testing with or without windings and accommodates field maintenance data recording, fault troubleshooting, and data archiving management requirements.

Company Qualifications

FAQ

1)What are the core safety precautions for operating the MEBYC-W3000 On-Load Switch Tester for Transformers?

Answer:
- Never perform measurements under live conditions. Disconnect test leads from the test terminals before measurement; do not remove test leads during testing.
- When testing with windings connected, short-circuit and ground all three phases of the transformer's non-test terminals. The instrument's O terminal must remain ungrounded.
Before use, securely connect the instrument's ground terminal. After testing, turn off the instrument before disconnecting any wiring.
Do not combine multiple circuits into a single measurement path. Keep unused circuits open.
For on-load switches that have not operated for extended periods, repeatedly switch positions before testing to remove oxidation and impurities from the contacts.

2)What winding types does the MEBYC-W3000 On-Load Switch Tester support, and what are the core wiring requirements?

Answer:
It supports testing for Y0, Y, and Δ winding configurations. Core wiring requirements are as follows:
Y0 Type (with neutral point): Clamp yellow, green, red, black in sequence to clamp the tap-change side A, B, C phases and neutral point. Connect to instrument terminals A, B, C, O respectively;
Y Type (without neutral point lead-out): Test AB, BC, CA separately using single-phase test method. Wiring must match corresponding phase colors;
△-type: Connect in two groups as prompted on the screen (A→C, B→C and A→B, C→B). After testing one group, return the switch to its original position before testing the other group. The final display indicates three-phase synchronism.

3)How does the MEBYC-W3000 On-Load Tap Changer Tester implement data storage and export functions?

Answer:
Data Storage: The built-in memory automatically saves up to 1000 sets of data. External USB drives can also be connected for storage. When a USB drive is connected, the instrument prioritizes reading and saving data to the USB drive (inserting a USB drive during testing takes effect only after the test completes).
Data Export: Access the file list via the instrument's "Open" function, select the desired file, and click "Export" to transfer the data file to an external USB drive.
Report Generation: The instrument can generate test reports in Word format. Alternatively, use the accompanying PC software (copy "Transformer On-Load Switch PC Software.exe" from the USB drive to your computer and install it). After opening the stored file, click "Convert to Word Document" to generate the report.

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