General Information
HDXZ-162kVA/54kV Variable Frequency AC Resonant Test System is applied for AC dielectric withstand test for electric equipment.
The system is mainly composed of following parts:variable frequency control power supply,exciting transformer,reactor and capacitive divider.
1. 10kV/300mm2 cable 3km AC withstand voltage test, capacitance ≤1.1265uF, test frequency 30-300Hz, test voltage 22kV, test time 5min.
2. 35kV/300mm2 cable 1.5km AC withstand voltage test, capacitance ≤0.2917uF, test frequency 30-300Hz, test voltage 52kV, test time 60min.
Features
● With the function of over-voltage, over-current, zero-start, system detune (flashover) protection. Over-voltage, over-current protection value can be set accordingly to user’ need. Flashover protection action when the test object
● flash over and tester records the flashover voltage value for testing analyze.
● Small volume, light weight, very suitable for the operation people on the spot.
● There are three kinds of working modes, which is convenient for user choosing according to on-site condition. Working modes : Automatic mode, Manual mode, Automatic tuning manual boost mode.
● Data can be stored and printed in different places, and the series numbers are figures which is convenient for identification and searching.
● When the device automatically sweeps the frequency, the starting point of frequency can be set arbitrarily in the specified range. Meanwhile, the LCD
● screen displays the scanning curve, which is convenient for users to directly understand whether the resonance point is found .
● Adopting DSP technology, which can increase and decrease functions and updated accordingly to the user’s need, it also makes the human-machine interface more humanized.
● Reduced greatly the required power capacitance , resonant equipment power can generate high voltage and large current by using the resonance of resonant reactor and test capacitor. Power can supply the loss power in the system , which only requires 1/Q of the resonant excitation power during the test .
● Reduced greatly weight and dimension of the equipment . The series resonant power supply not only eliminates the bulky high-power voltage regulator and ordinary high-power frequency test transformer, but also requires the 1/Q of the resonant excitation power to reduce the weight and dimension of the system, which is generally 1/10-1/30 of the common test device.
● Improve the output of voltage wave .The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of output voltage and get the good sinusoidal waveform effectively preventing the error breakdown of the harmonic peak to the test object.
● Prevent large short circuit current burn fault point. When test object is breakdown in the series resonant state， the circuit is detuned immediately and the circuit current drops rapidly to the 1/Q of normal tested current .The breakdown current increase to dozens of time during power frequency withstand test of transformer. Compared with two test methods , short current and breakdown current is hundreds of times different . Resonance test equipment can efficiently find the insulation weakness and large short circuit current burn fault point.
● No-recovery over-voltage . When test object is break down , high voltage immediately disappear also immediately extinguished due to the loss reasonance condition. It takes a long time to recovery flashover voltage before cutting off the power .This voltage recovery process is a kind of energy accumulation of intermittent oscillation process, there is no any recovery over-voltage in the process .
Specifications
1) Equipment combination mode
| combination method Test object |
Reactor （40.5kVA/27kV Four） |
Excitation transformer Output selection |
Test voltage(kV) |
| 10kV/300mm2 cable3km | Use Four reactors in parallel | 1.5kV | ≤22kV |
| 35kV/300mm2 cable 1.5km | Two reactors in series And two sections in parallel | 3kV | ≤52kV |
2) System Configuration Parameters
1. AC Power source HTXZ-10kW 1 unit
1) Rated output capacity:10kW
2) Working power supply:220/380±10%V(single/three-ohase),power frequency
3) Output voltage: 0–400V
4) Rated input current: 25A
5) Rated output current: 25A
6) ) Voltage resolution: 0.01kV
7) Voltage measurement accuracy: 1.5%
8) Frequency regulation range: 30–300Hz
9) Frequency Adjustment Resolution: ≤0.1Hz
10) Frequency stability: 0.1%
11) Running time: 60 minutes at rated capacity
12) Temperature rise: The highest temperature of components running continuously for 60 minutes at rated capacity is less than 65K
13) Noise level：≤50dB
14) Diemension（L*W*H mm）：400×280×400
15) Weight：about 10kg
2. Excitation transformer HTJL-10kVA/1.5/3kV/0.4kV 1 unit
1) Rated capacity：10kVA
2) Input voltage：0-400V
3) Output voltage：1.5/3k
Structure: Dry type
4) Diemension（L*W*H mm）：450×330×430
5) Weight：about 45kg
3. High voltage reactorHTDK-40.5kVA/27kV 4unit
1) Rated capacity：40.5kVA;
2) Rated voltage：27kV
3) Rated current：1.5A
4) Electric inductance：80H/single section
5) Quality factor:Q≥30 (f=45Hz)
6) Structure: dry type
7) Diemension（L*W*H mm）：∅282×435
8) Weight：about 45kg
4. Capacitor divider HTFY-2500pF/60kV 1 set
1) Rated voltage：60kV
2) High voltage capacity：2500pF
3) Dielectric loss：tgσ≤0.5%
4) Partial voltage ratio：1000：1
5) Measurement accuracy: Valid value level
6) Diemension（L*W*H mm）：∅140×650
7) Weight：about 8kg
