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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDTF-108kVA/108kV is a professional, field-optimized variable frequency series resonant test system exclusively designed for 110kV substation electrical equipment AC withstand voltage tests. It fully complies with DL/T 849.6-2016 and GB 50150-2016 standards, adopting the series resonance principle to generate high voltage and large current with only a small input power, solving the problem of traditional test transformers being too heavy and having insufficient capacity for large capacitive loads.
The system consists of a variable frequency control power supply, an excitation transformer, four identical 27kV/1A dry-type epoxy-cast reactors, and a 0.5-class standard capacitor divider.The reactors can be flexibly connected in series or parallel to adapt to different test voltage and current requirements. Equipped with a 7-inch color touch screen and advanced automatic frequency sweep algorithm, it can automatically find the resonance point within 30 seconds, complete the entire test process with one click, and store all test data for traceability. With comprehensive safety protection including over-voltage, over-current, flashover, zero-start, and emergency stop, it ensures safe operation in harsh field environments. Ideal for commissioning and preventive maintenance tests of 110kV GIS, power transformers, XLPE power cables, bushings, insulators, and switchgear.
Specifications
|
Parameter |
Specification |
|
Input Power |
3-phase 380V±10%, 50Hz |
|
Rated Output Capacity |
108kVA |
|
Rated Output Voltage |
0–108kV AC (RMS) |
|
Rated Output Current |
1A (series) / 2A (parallel) |
|
Reactor Configuration |
4×27kV/1A dry-type epoxy-cast reactors |
|
Combination Modes |
27kV/4A, 54kV/2A, 108kV/1A |
|
Operating Frequency Range |
30Hz–300Hz |
|
Frequency Resolution |
0.1Hz |
|
Frequency Stability |
≤0.01% |
|
System Quality Factor (Q) |
≥30 (typical 30–50) |
|
Output Waveform Distortion |
≤1% |
|
Voltage Measurement Accuracy |
≤±1.5% F.S |
|
Current Measurement Accuracy |
≤±1.5% F.S |
|
Test Modes |
Automatic test, Manual test, Timed test |
|
Timing Range |
0–9999s adjustable |
|
Display |
7-inch color touch screen |
|
Data Storage |
1000 groups (with time stamp) |
|
Data Export |
USB flash drive |
|
Protection Functions |
Zero-start, Over-voltage, Over-current, Flashover, Emergency stop, Ground detection, Over-temperature |
|
Continuous Operation Time |
60 minutes at full load |
|
Operating Temperature |
-10℃ ~ +40℃ |
|
Operating Humidity |
≤85%RH (non-condensing) |
|
Compliance |
DL/T 849.6-2016, GB 50150-2016, GB/T 16927.1-2011, IEC 60060-1, IEC 61010-1 CAT III 1000V |
Applications
Core Test Objects (110kV Substation)
- GIS & gas-insulated switchgear: 110kV GIS, circuit breakers, disconnectors, busbars
- Power transformers: 110kV power transformers and distribution transformers
- XLPE power cables: 110kV cables ≤500m, 35kV cables ≤1km, 10kV cables ≤3km
- Bushings & insulators: 110kV transformer bushings, post insulators, suspension insulators
- Switchgear & cabinets: 35kV and below medium-voltage switchgear
- Capacitors & reactors: high-voltage power capacitors and reactors
Typical Usage Scenarios
- Substation commissioning: new equipment acceptance tests according to GB 50150-2016
- Preventive maintenance: periodic insulation strength tests
- Power plant testing: generator transformer and auxiliary equipment tests
- Third-party inspection: compliance testing and certification
- Construction site testing: on-site test of newly installed equipment
Advantages
97% Energy Saving vs Traditional Test Transformers
Series resonance principle reduces input power to only 1/Q of output power → small input power, light weight, easy to transport
Flexible Reactor Combination
4-stage 27kV reactors can be connected in series or parallel → one system covers all test requirements from 10kV to 110kV
Automatic Resonance Finding
One-click auto sweep finds resonance point within 30 seconds → eliminates manual tuning, improves test efficiency
Pure Sine Wave Output
Waveform distortion ≤1% → meets strict requirements of national and international standards
Comprehensive Safety Protection
Multiple protection layers + flashover protection → maximum safety for operators and expensive test equipment
FAQ
Q: What is the principle of variable frequency resonant test system?
A: It uses the series resonance principle: adjust the output frequency of the power supply to make the reactor inductance resonate with the test sample capacitance, generating high voltage and large current on the test sample with only a small input power.
Q: What is the difference between resonant test system and traditional test transformer?
A:
- Resonant system: Input power is only 1/Q of output power (Q≥30), light weight, small size, pure sine wave output, no voltage rise effect
- Traditional test transformer: Input power equals output power, heavy, large size, waveform distortion, serious voltage rise effect for capacitive loads
Q: How long does it take to find the resonance point?
A: The automatic frequency sweep algorithm can find the resonance point within 30 seconds for most test samples.
Q: What is the maximum length of 110kV XLPE cable that can be tested?
A: With 1A rated current at 108kV, it can test up to 500m of 110kV XLPE power cable.
Q: Can it be used for both power frequency and variable frequency tests?
A: Yes. The 30–300Hz wide frequency range supports both power frequency (50Hz) and variable frequency (20–300Hz) tests according to different standards.
