Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of On-load tap changer test in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is On-load tap changer test?
The On-Load Tap Changer Test System is used for comprehensive testing of the dynamic resistance (DRM), switching transition time, motor drive current, and mechanical characteristics of on-load tap changers (OLTCs) of transformers. It supports waveform acquisition, trend comparison, and automatic report output, and is suitable for factory testing, acceptance testing, condition-based maintenance, and troubleshooting.
What is Technical Indicators?
Output current 1.0A,0.5A,0.2A
Transition resistance range：
0.3Ω～20Ω(1.0A)
5Ω～40Ω(0.5A)
20Ω～100Ω(0.2A)
Transition time ：0～320ms
Open circuit voltage: 24V
Transition resistance accuracy：±(5%±0.1Ω)
Transition time ：±(0.1%±0.2ms)
Resonant frequency:20kHz
What services do we provide?
Selection and Matching: Recommended configuration based on OLTC type (resistive/reactive), transformer capacity, test items (DRM/motor current/timing), and site conditions.
Connection Scheme Confirmation: Assist in verifying terminal numbers, motor current connection points, auxiliary contact definitions, and sensor installation locations.
Baseline Establishment Recommendations: Provide initial test data recording specifications and range management templates for easy subsequent trend management.
Document Support: Technical parameter tables, typical wiring diagrams, tender documents, and typical application cases (to the extent available).
FAQ
Q1: What are the main items tested in the On-Load Tap Changer Test?
A: The main items include Dynamic Resistance (DRM), switching transition time, motor drive current waveform, and auxiliary contact timing, etc. Specific testing depends on the model configuration.
Q2: What is the fundamental difference between DRM and DC resistance testing?
A: DC resistance measures static values; DRM collects resistance changes in real time during OLTC operation, reflecting the dynamic contact state during switching. The two are complementary, not substitutes.
Q3: Why is DRM better at detecting potential OLTC problems than traditional testing methods?
A: Traditional methods measure in a static state and cannot detect instantaneous contact problems during switching; DRM collects data during actual switching, more closely resembling real-world operating conditions.
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