UHV(H) AC Resonant Test System for CVT
The calibration of capacitive voltage transformers (CVTs) requires testing to be conducted strictly at a 50Hz frequency. However, complex on-site geographical conditions often make it difficult for traditional testing devices to meet the requirements for handling and operation in the field. In response, the series resonant boosting device, as the first domestically developed field-adjustable resonance device in China, has been widely adopted for on-site calibration of capacitor voltage transformers at 500 kV and below.
Fundamental principle
Power frequency resonance is divided series resonance and parallel resonance, the two ways to take compensation effect of power capacity is basically thesame, after reaching full compensation, the input capacity can be reduced to 1 / Q or less of test output capacity.
Technical parameters
Rated Capacity: 80kVA
rated voltage: 160kV
Adjustable inductance range: 65~130H
Rated frequency: 50Hz
Rated current: 0.5A
Adjustable gap range:0~300mm
Operations
1. Over-current protection setting: 0.7 times of the rated current of the control unit. Example: the rated current of the control unit is 27A, the matched mutual inductor is 30/5, should adjust the current relay to be 3.3A.
2. Voltage withstanding time setting: set the time of the time relay to requiredtime.
3. Connect and check test wires according the pictures, close the console breaker, adjust the regulator to 0 if it not at 0 position. Do not connect the mainpower, adjust the space of reactor iron core, check if the up-down and limit protectionarenormal.
4. Close main power, press “boost” button, the reactor get hundreds of voltage,tuned by changing the air gap to achieve the highest output voltage, tuningiscompleted at this time, you can boost voltage, it will auto time (voltage withstandtime) after achieve the test voltage value, and will auto back to 0 after to voltagewithstanding time.
5. Off the main power,During the test, relevant person should strengthen monitoring equipment under test, once there was abnormal phenomenon should quick buck regulator, andalso disconnect the power.
