Substation frequency conversion series resonance test device

Substation frequency conversion series resonance test deviceMainly designed and manufactured for AC withstand voltage testing of primary electrical equipment in substations of 220kV and below. Can meet the AC withstand voltage test requirements for capacitive equipment such as transformers, GIS systems, SF6 switches, cables, and bushings according to regulations. The frequency conversion series resonance test device can meet the requirements of high voltage and low current equipment test conditions, as well as low voltage and high current equipment test conditions. It has a wide range of applications and is an ideal withstand voltage equipment for high voltage testing departments and power installation and maintenance engineering units at the prefecture, city, and county levels.

The variable frequency series resonance test device for substations mainly consists of a variable frequency control power supply, an excitation transformer, a reactor, and a capacitive voltage divider. The variable frequency control power supply adopts an imported specialized SPWM digital waveform generation chip with a frequency resolution of 16 bits. The frequency fineness can reach 0.1Hz between 20-300Hz. At the same time, it adopts orthogonal asynchronous fixed carrier modulation to ensure good output waveform throughout the entire frequency range; The power section adopts advanced IPM modules to ensure the stability and safety of the instrument.
Substation frequency conversion series resonance test deviceProduct Features
1. Reactors of the same voltage level and capacity have smaller volume and lighter weight; Low temperature rise at rated load; Adopting dry epoxy casting, it has high mechanical strength, good electrical insulation performance, and is aesthetically pleasing and reliable.
2. The variable frequency control source has a large capacity margin; Strong protection function; Good output waveform; Good stability; Having multiple working modes and easy operation; Adopting 220V or 380V single-phase power supply for convenient on-site power supply.
3. Flexible configuration. Different types of reactors can be selected to meet the requirements of different test samples, achieving multi use and high cost-effectiveness.
Substation frequency conversion series resonance test deviceProduct Parameters
Rated output voltage: 0-800kV (AC RMS) and below
Output frequency: 20-300Hz
Resonant voltage waveform: pure sine wave, waveform distortion rate<1.0%
Large experimental capacity: 1000kVA and below
Working system: Under full power output, a continuous working time of 15 minutes per operation
Quality factor: 30-90
Frequency adjustment sensitivity: 0.1Hz, instability<0.05%
Working power supply: 380/220V ± 15%/50Hz ± 5%
Substation frequency conversion series resonance test devicePrecautions
1. When conducting high-voltage electrical tests, two or more personnel must participate, and clear division of labor and methods between each other must be established. And there is a dedicated person to monitor on-site safety and observe the test status of the test samples;
2. High voltage test transformers and test transformer control boxes should have reliable grounding;
3. During the experiment, the boosting speed should not be too fast, and sudden full voltage power on or off is not allowed;
4. If any abnormal conditions are found during the boost or withstand voltage test, the voltage should be immediately reduced, the power should be cut off, the test should be stopped, and the cause should be identified before conducting the test. ① The pointer of the voltmeter swings greatly; ② Discovering the odor and smoking phenomenon of burnt insulation; ③ There is abnormal sound inside the tested object.
5. In the experiment, if the test sample short circuits or breaks down due to a fault, the overcurrent relay in the control box will work. At this time, the voltage regulator should be returned to zero and the power should be cut off before the test sample can be removed.
6. When conducting capacitance tests or DC high-voltage leakage tests, after the test is completed, the voltage regulator should be lowered to zero and the power should be cut off. Then, the high-voltage end of the test sample or capacitor should be discharged to the ground using discharge to avoid the risk of electric shock caused by the potential remaining in the capacitor.