Overview
The device is mainly designed and manufactured for the AC withstand voltage test of 10kV, 35kV, 110kV,132KV cables and their systems. The reactor adopts multiple separate designs, which can not only meet the requirements of high voltage and low current equipment test conditions, but also meet low voltage AC withstand voltage test requirements such as 10kV cable. It has a wide application range.
The system mainly includes Frequency power (Controller), excitation transformer, resonant reactor, capacitive divider.
1. Advantages:
1) The required power supply capacity is greatly reduced. The series resonant power supply uses the resonant reactor and the capacitor resonance to generate high voltage and large current. In the whole system, the power supply only needs to provide the part of the system that consumes power. Therefore, the power required for the test is only the test capacity 1/Q.
2) The weight and volume of the equipment is greatly reduced. In the series resonant power supply, not only the bulky high-power voltage regulating device and the ordinary high-power power frequency test transformer are omitted, but also the resonant excitation power supply only needs to test the capacity of 1/Q, so that the weight and volume of the system are greatly reduced, generally 1/10-1/30 of the common test device.
3) Improve the waveform of the output voltage. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage and obtain a good sinusoidal waveform, effectively preventing the harmonic breakdown of the sample from being accidentally broken.
4) Prevent large short-circuit currents from burning the point of failure. In the series resonance state, when the insulation weak point of the sample is broken, the circuit is immediately detuned, and the loop current rapidly drops to 1/Q of the normal test current. When the parallel resonance or test transformer method is used for the withstand voltage test, the breakdown current immediately rises several tens of times. Compared with the two, the short-circuit current and the breakdown current are hundreds of times different. Therefore, the series resonance can effectively find the insulation weakness, and there is no worry about the large short-circuit current burn failure point.
5) No recovery overvoltage will occur. When the sample breaks down, the high voltage also disappears immediately due to the loss of the resonance condition, the arc is extinguished immediately, and the recovery voltage is re-established for a long time. It is easy to disconnect the power supply before reaching the flash voltage again. This voltage recovery The process is an intermittent oscillation process of energy accumulation, the process is long, and no recovery overvoltage occurs.
2.Main function and its technical characteristics:
1) The device has protection functions such as over-voltage, over-current, zero-start, system detuning (flashing off), over-voltage and over-current protection values can be set according to user needs, flashing protection action when the sample flashes down and can record flashing Voltage value for test analysis.
2) The entire unit is lightweight and easy to use on site.
3) The device has three working modes, which is convenient for the user to flexibly select according to the site conditions and improve the test speed. The working modes are: fully automatic mode, manual mode, and automatic tuning manual boost mode.
4) It can store and print data, and the stored data number is a number, which is convenient for users to identify and find.
5) When the device is automatically swept, the frequency start point can be arbitrarily set within the specified range. The sweep frequency direction can be selected upwards and downwards, and the liquid crystal large screen displays the scan curve, which is convenient for the user to intuitively know whether to find the resonance point.
6) Adopted DSP platform technology, can conveniently according to the needs of user increase or decrease function and upgrade, but also makes the man-computer exchange interface humanized.
System technical parameter
1.RTSC-manufacturers code
270kVA - rated capacity, the unit is kVA
270KV- voltage class, the unit is kV;
2. Technical parameter of full system
-Rated test voltage:270KV, To meet ≤132kV AC withstand voltage testing;
-Output voltage waveform distortion rate: < 1.0%
-Continuous working allowed: 30mins under voltage; 60mins if cables testing;
-The device Quality factor: Q > 50
-Cable full load factors: Q > 30 ( load related)
-Input voltage: 380V/220V single phase
-Frequency adjustment range: 30Hz ~300Hz
-System measuring precision: 1.5%
-Protection functions such as overvoltage, overcurrent and zero start.
3.Mainly configuration and technical parameter
1) Controller (1 unit) :
-Power rating: 15kW ;
-Input voltage: 380V/220V±15% 50Hz single phase
-Output voltage: 0 ~ 400V adjustable
-Output voltage frequency: 30 ~ 300Hz
-Frequency adjustment: 0.1 Hz stepping adjustable
-Frequency instability degrees: ≤ 0.02%
-Output current: 0 ~ 37.5
2) Reactors ( 6 units ) :
-Rated voltage: 45kV
-Rated current: 1A
-Rated inductance: 120H
-Continuous working time: 60min
-Temperature rises: < 60˚C
-Working frequency: 30 ~ 300Hz
3) Excitation transformer ( 1 unit ) :
-Rated capacitance: 15kVA
-Input voltage: 400V/200V
-Output voltage: 1.5kV/3kV/6kV/15kV
-Output current: 10A/5A/2.5A/1A
4) Capacitance Divider( 1 unit ) :
-Capacitance: 1000pF
-Rated voltage:300kV
-Working frequency: 30 ~ 300Hz
5)Measurement calbes & accessaries: 1 set
0.1Hz VLF AC/DC Hipot tester
