Which is good for series resonance

Complete set of equipment for frequency conversion series resonance testThe BYXZ series is mainly used for cross linked rubber power cables of 10kV, 20KV, 35kV, and 110kV, frequency conversion AC withstand voltage tests of 66kV, 110kV, and 220kV combination electrical appliances (GIS), and power frequency AC withstand voltage tests of hydraulic and thermal generators or power transformers. The basic principle is to use an adjustable (30-300Hz) series resonance test equipment to resonate with the capacitance of the test object to generate an AC test voltage. Due to the large capacitance of cables, traditional power frequency test transformers are bulky, bulky, and difficult to obtain on-site power sources with high currents. Therefore, series resonant AC withstand voltage test equipment is generally used. Its input power capacity can be significantly reduced, weight can be reduced, and it is easy to use and transport. In the initial stage, induction type series resonant devices (50Hz) were commonly used, but they have disadvantages such as poor automation and high noise. Therefore, nowadays, frequency conversion resonance is mostly used, which can achieve higher quality factor (Q value), and has advantages such as automatic tuning, multiple protections, noise reduction, flexible combination methods, and light weight per piece.

1Complete set of equipment for frequency conversion series resonance testCapacity selection of BYXZ series resonant device:

Test current: I=2 π fCU × 10-3 (A).

Frequency selection (HZ):

1. Generator -50HZ, take 50HZ.

2. Transformer -45~65Hz, take 50Hz.

3.GIS、 Switches and busbars -30~300Hz, take 45Hz.

4. Power cable: 30-300Hz, take 35Hz.

5. Voltage selection (KV): Determine the DA test voltage according to regulatory requirements.

6. Selection of capacitance (uf): determined based on the large capacitance of the test sample.

7. Large capacity of the device: P=UI × 1.25 (KVA).

2、 Main technical parameters:

Rated capacity: 270kVA.

Rated voltage: 45kV; 90kV; 135kV;270kV。

Rated current: 6A; 3A; 2A; 1A。

Measurement accuracy: The effective value of the system is at level 1.5.

Operating frequency: 30-300Hz.

Device output waveform: sine wave.

Quality factor: The device itself has a Q ≥ 30 (f=45Hz)

Waveform distortion rate: Output voltage waveform distortion rate ≤ 1%.

Input power supply: single-phase 220 or three-phase 380V voltage, frequency 50Hz.

Working time: Continuous 60 minutes allowed under rated load; Overvoltage 1.1 times for 1 minute.

Temperature rise: The temperature rise after continuous operation for 60 minutes under rated load is ≤ 65K.

Protection functions: overvoltage, overcurrent, zero start, system detuning (flashover) and other protection functions.

Environmental temperature: -20 ℃ -55 ℃.

Relative humidity: ≤ 90% RH.

Altitude: ≤ 3000 meters.