Product introduction
The CVT Resonance Test Set is a critical device in power systems used for conducting power frequency AC withstand voltage tests on high-voltage electrical equipment (such as cables, transformers, GIS, generators, etc.). It utilizes the principle of series resonance to generate high voltage at power frequency (50Hz or 60Hz) to verify the insulation strength and performance of the equipment.
An AC Resonance Test for CVT (also known as a Resonant Frequency Test or Resonant Withstand Test) is a specialized high-voltage test performed on Capacitive Voltage Transformers (CVTs) to assess the integrity of their main insulation system (primarily the capacitor sections and the electromagnetic unit insulation).
Technical parameters (customizable)
|
Rated capacity |
80kVA |
|
Rated voltage |
160kV |
|
Adjustable inductance range |
65~130H |
|
Rated frequency |
50Hz |
|
Rated current |
0.5A |
|
Adjustable gap range |
0~300mm |
Key Benefits Over Conventional Power Frequency Test Transformers
1.Dramatically Reduced Input Power Demand: This represents the most significant operational improvement. The system draws only 1/Q of the power required by the test object itself, substantially easing power source constraints, particularly crucial for field applications.
2.Enhanced Portability: The combination of a smaller power supply unit, lower-capacity excitation transformer, and modular reactor design results in a far more compact and lightweight system compared to an equally rated test transformer. This greatly simplifies transport and on-site deployment.
3.Superior Output Waveform: The resonant circuit of resonance test system inherently produces a high-purity sinusoidal output voltage at the test object, fully compliant with standard specifications.
4.Inherent Fault Current Limitation During Flashovers: If the test object flashes over or breaks down, the resonant condition collapses instantly. This causes a rapid increase in circuit impedance, naturally restricting the fault current magnitude (I = Uin / Z). The resulting current is merely a fraction (approximately 1/Q) of the pre-fault resonant current, significantly minimizing potential damage compared to the high short-circuit currents typical of test transformers.
5.Streamlined Resonance Tracking: Frequency-variable control enables rapid, precise, and largely automated identification and maintenance of the resonant point.
Typical Application Scenarios
1.Power Cables: Commissioning tests, preventive maintenance tests (main insulation AC withstand voltage test, replacing DC withstand voltage).
2.Gas-Insulated Switchgear (GIS): Commissioning tests, post-overhaul tests (main circuit AC withstand voltage test).
3.Generators: Stator winding AC withstand voltage test.
4.Transformers: Induced voltage withstand test (requires frequencies above rated frequency but still falls under the power frequency resonance principle).
5.Capacitive Equipment: AC withstand voltage tests for bushings, instrument transformers, etc.
6.Other High-Voltage Electrical Equipment: AC withstand voltage tests for disconnectors, insulators, etc.
The Resonance Test System (CVT) under Wuhan UHV can help many power workers conduct various power tests more conveniently. Quality guaranteed, worry free after-sales service, welcome to purchase!
Hot Tags: resonance test system, China resonance test system manufacturers, suppliers, factory, 100 kv hipot tester, generation of high impulse voltage, , lightning impulse voltage generator, high voltage induction tester, hipot voltage
