Transformer Testing
GD200-40WA Dual-Channel DC Winding Resistance Tester
Dual constant-current-source DC winding resistance tester with separate high-voltage and low-voltage channels, designed for temperature-rise tests on transformers up to 35kV where HV and LV winding resistances differ greatly.
Overview
Dual constant-current-source DC winding resistance tester with separate high-voltage and low-voltage channels, designed for temperature-rise tests on transformers up to 35kV where HV and LV winding resistances differ greatly.
Standards & Compliance
Benchmark standards for this equipment category
Systems in this category are commonly specified against these standards, linked to the issuing body. Final configuration and acceptance criteria follow the standard and edition you nominate.
- IEC 60076-1 — Power transformers - General
- IEC 60076-3 — Insulation levels and dielectric tests
- IEC 60076-5 — Ability to withstand short circuit
- IEEE C57.12.90 — Test code for liquid-immersed distribution and power transformers
- GB 1094 — Power transformers
- GB 50150 — Hand-over test of electrical equipment
Application Scenarios
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Get a QuoteDetailed Description
Overview: DC winding resistance is a mandatory test for transformers during manufacturing, factory testing, installation, handover and preventive testing. It detects material, welding, loose-connection, missing-strand and broken-wire defects and hidden dangers after operation.
Design: the instrument uses dual constant-current-source design, CPU-controlled charge/discharge sequencing and complete protection, so it is very suitable for temperature-rise tests on transformers whose HV and LV winding resistances differ greatly. It supports simultaneous or separate HV and LV side testing.
Output and range: the maximum output current is 20 A and the maximum range is 2kΩ, suitable for temperature-rise testing and DC resistance measurement of all transformers at 35kV and below. The HV channel (CH1) provides 5A/1A/0.1A/0.01A and the LV channel (CH2) provides 20A/10A/5A/2A.
Protection and storage: the instrument features AC380V misconnection protection and alarm, wire-break anti-arc protection, and audible discharge alarm. It includes a calendar, 100 groups of conventional data storage and two temperature-rise test result stores, with a USB port for exporting data and generating temperature-rise curves.
Technical Specifications
| Output current (HV CH1) | 5A, 1A, 0.1A, 0.01A |
|---|---|
| Output current (LV CH2) | 20A, 10A, 5A, 2A |
| Range (HV CH1 - 5A) | 0Ω-4Ω |
| Range (HV CH1 - 1A) | 20mΩ-20Ω |
| Range (HV CH1 - 0.1A) | 200mΩ-200Ω |
| Range (HV CH1 - 0.01A) | 2Ω-2000Ω |
| Range (LV CH2 - 20A) | 0Ω-0.1Ω |
| Range (LV CH2 - 10A) | 2mΩ-0.4Ω |
| Range (LV CH2 - 5A) | 4mΩ-0.8Ω |
| Range (LV CH2 - 2A) | 10mΩ-2Ω |
| Accuracy (HV CH1) | 0.2%±1μΩ |
| Accuracy (LV CH2) | 0.2%±0.2μΩ |
| Minimum resolution | 0.1μΩ |
| Temperature-rise recording interval | 10s, 30s, 60s |
| Operating temperature | -20°C to 40°C |
| Humidity | ≤80%RH, no condensation |
| Power supply | AC220V±10%, 50Hz±1Hz |
| Dimensions | 410mm x 440mm x 210mm |
| Net weight | 15.7kg |
Frequently Asked Questions
What is the GD200-40WA Dual-Channel DC Winding Resistance Tester used for?
Why does it have two channels?
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Further Reading
Method and selection guides that cover the tests this instrument performs.
Reviewed by the Application Engineering Team at Nanjing Gaodian Electric Power Equipment
Specifications are taken from the manufacturer’s technical documentation. Final configuration and acceptance criteria follow the standard and edition you nominate — tell us your test list and we will confirm the ratings.
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