Overview
The DC resistance of transformers is a mandatory test item during manufacturing, factory acceptance testing of semi-finished and finished products, installation, handover testing, and preventive maintenance testing by power utilities. It effectively identifies manufacturing defects such as material selection issues, poor soldering, loose connections, missing strands, or broken wires in transformer windings, as well as potential hazards that may arise during operation. During temperature rise tests for distribution transformers, the significant disparity in resistance between high- and low-voltage windings precludes traditional testing methods using a single constant-current source in series. Employing two test instruments risks mutual induction damage to the equipment. Leveraging proprietary technological expertise, our company developed this DC resistance tester to resolve this challenge. Featuring a dual constant-current source design, CPU-controlled charging/discharging sequences, and comprehensive protection measures, this instrument is ideally suited for temperature rise testing of transformers with vastly differing high- and low-voltage winding resistances.
1. This instrument delivers high output current (up to 20A maximum) and features a wide test range (up to 2KΩ maximum), making it suitable for temperature rise tests and DC resistance measurements on all transformers rated 35kV and below.
2. Comprehensive dual constant-current power supply design. Capable of simultaneous or separate testing on both high-voltage and low-voltage sides.
3. Features protection alarms for incorrect AC 380V input connections, arc-resistant protection against wire breaks, and audible discharge alarms with clear indicators to minimize operational errors. Comprehensive protection circuits ensure high reliability.
4. Large color touchscreen display provides clear, easy-to-read data.
5. Temperature rise tests support automatic printing and storage of temperature rise data at preset intervals for convenient record-keeping.
6. The instrument incorporates a perpetual calendar, 100 sets of routine data storage, and storage for 3 sets of temperature rise test results. Data is retained even after shutdown. A USB port is provided for convenient export to generate temperature rise curves on a computer.
7. This instrument features an RS485 communication interface. When paired with host computer control software, it enables remote control and measurement.
8. The unit comes with temperature rise software for automatic data processing and generation of temperature rise curves.
1. Output Current:
High Voltage CH1: 5A, 1A, 0.3A, 0.1A, 0.01A
Low Voltage CH2: 20A, 10A, 5A, 2A
2. Measurement Range:
(High Voltage CH1—5A): 0Ω—4Ω
(High-voltage CH1—1A): 20mΩ—20Ω
(High-voltage CH1—0.3A): 60mΩ—60Ω
(High-voltage CH1—0.1A): 200mΩ—200Ω
(High-voltage CH1—0.01A): 2Ω—2000Ω
(Low Voltage CH2—20A): 0Ω—0.1Ω
(Low Voltage CH2—10A): 2mΩ—0.4Ω
(Low Voltage CH2—5A): 4mΩ—0.8Ω
(Low Voltage CH2—2A): 10mΩ—2Ω
3. Accuracy: (High-voltage CH1): 0.2% ± 1μΩ
(Low-voltage CH2): 0.2% ± 0.2μΩ
4. Minimum resolution: 0.1μΩ
5. Temperature rise data logging interval: Configurable in 5-second increments, range 5–90 seconds.
6. Operating Temperature: -20°C to 40°C
7. Ambient Humidity: ≤80% RH, no condensation
8. Power Supply: AC 220V ±10%, 50Hz ±1Hz
9. Dimensions: Length 360mm × Width 280mm × Height 170mm
10. Net Weight: ≈8kg
We provide you with free consultation services
Engineers provide guidance for installation and commissioning
Technicians can provide on-site maintenance services and receive regular training
Perfect technical consulting service system
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Address: China Optics Valley No. 1, Fenghuangyuan 2nd Road, Donghu High-tech Development Zone, Wuhan City
whmoen@163.com
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15997412136
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400-017-7185
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