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Variable Frequency Series Resonant AC Test System

type:ZCVF-A 5000kVA/1000kV
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  • Product Introduction

1.Subject and Test Requirements

1.1AC withstand voltage test of 800kV GIS, capacitance ≤ 0.007uF, test frequency 30 ~ 300Hz, test voltage 960kV, test time 1 minute.

1.2AC withstand voltage test for 500kV GIS, switches, test frequency 30 ~ 300Hz, test voltage 740kV, test time 1 minute.

1.3AC withstand voltage test of 220kV/630mm2 cable for 1km, capacitance ≤ 0.144uF, test frequency 30 ~ 300Hz, test voltage 216kV, test time 1min.


  • Product Parameters
System component list
NameModel and SpecificationUnitQty
Excitation transformerJLB-200kVA/10/20/40kV/0.4kVpcs1
Variable frequency power sourceCHXB-200kW/380Vpcs1
High voltage reactorDK-1250kVA/250kVpcs4
Capacitor voltage dividerFRC-1000kV/1000pFset1


Main technical parameters and functions of the System
Rated capacity5000kVA
Input power supply3 phase 380V voltage, frequency 50Hz
Rated voltage250kV; 750kV; 1000kV
Rated current20A; 6.6A; 5A
Working frequency30 ~ 300Hz
Device output waveformsine wave
Waveform distortion rateOutput voltage waveform distortion rate ≤ 1%
Working timeAllow continuous 60 minutes under rated load; Overvoltage 1.1 times for 1 minute
Temperature riseAfter continuous operation for 60 minutes under rated load, the temperature rise is ≤ 65K
Quality factorThe device's own Q ≥ 30 (f=45Hz)
Protection functionIt provides overcurrent, overvoltage, and sample flashover protection for the tested product (see the variable frequency power source section for details)
Measurement accuracySystem effective value is class 1.5


System configuration and parameters
Excitation transformer: JLB-200kVA/10/20/40kV/0.4kV
Rated capacity200kVA
Input voltage0-400V, single-phase
Output voltage10/20/40kV
StructureOil type
 Weightapprox. 1.5T
Variable frequency power source: CHXB-200kW/380V
Rated output capacity200kW
Working power supply380 ± 10% V (three-phase), power frequency
Output voltage 0-400V, single-phase
Rated input current500A
Rated output current500A
Voltage resolution0.01kV
Voltage measurement accuracy1.5%
Frequency adjustment range30 ~ 300Hz
Frequency adjustment resolution≤ 0.1Hz
Frequency stability0.1%
Running timecontinuous 60 minutes at rated capacity
The maximum temperature of the component during continuous operation for 60 minutes at rated capacity is ≤ 65K
Noise level≤ 50dB
Weightapprox. 300kg
High voltage reactor: DK-1250kVA/250kV
Rated capacity1250kVA
Rated voltage250kV
Rated current5A
Inductance76H/single section
Quality factorQ ≥ 30 (f=45Hz)
StructureOil type
Weightapprox. 1.2T
Capacitor voltage divider: FRC-1000kV/1000pF
Rated voltage1000kV
High voltage capacity1000pF
Dielectric losstg σ≤ 0.5%
Partial pressure ratio10000:1
Measurement accuracyRMS level 1.5
Weightapprox. 350kg


  • Product Features

Structure and performance characteristics:

1.The placement of variable frequency power source is vertical and horizontal, especially suitable for on-site operation and observation;

2.The internal and external parts are equipped with special shock-absorbing rubber support feet and protective aluminum boxes, which can effectively reduce the bumps and vibrations during transportation and the impact during lifting. Ensuring the long-term stability and reliability of variable frequency power supply;

3.Parameter display: Touch or external mouse large screen LCD interface display system

It can display resonance voltage (i.e. the target voltage set before the test), test frequency, measurement frequency, low-voltage voltage, low-voltage current, withstand voltage time, overvoltage protection, overcurrent protection, flashover protection, stage boosting and timing, operation mode switching, capacitance, inductance, frequency exchange calculation, parameter inquiry, etc. It can also display frequency curves, voltage curves, etc., which can intuitively judge the accuracy and stability of the resonance frequency in the current test;

4.Parameter settings: The large touchscreen LCD color screen and external mouse can directly complete various parameter settings. It can set or select parameters such as starting frequency, ending frequency, starting voltage, stage boosting and timing, measuring voltage divider ratio, excitation ratio, overvoltage protection, overcurrent protection, flashover protection, test mode, capacitance and inductance frequency exchange calculation, parameter setting prompts, and help;

5.Experimental mode: Touch screen and external mouse operation, with three operating modes: fully automatic, semi-automatic, and manual. Capable of boosting, tuning (including manual and automatic), segmented boosting and timing, operating status, mode switching, fault prompt, capacitance and inductance frequency exchange calculation functions, etc.

6.Protection function and information prompt: equipped with multiple protection functions such as high voltage overvoltage protection, low voltage overcurrent protection, overcurrent protection, as well as detuning protection, zero position protection, flashover protection, emergency stop, undervoltage protection, etc.

7.Data storage function: saving test results (manually), printing, uploading, reviewing, etc.

Test results: After the manual or automatic test is completed, the detailed parameters of the test can be displayed in the test results interface. When the test is interrupted, the interruption status can be prompted. The parameters can be saved in memory, which is a non-volatile memory that can store 50 test records;

Data query: It can display saved test result data on the screen, and has a USB interface to output and print the data;

8.Automatic voltage stabilization function: The system automatically tracks and maintains a stable test voltage based on the set test voltage or manual boosting results, with a voltage stability of up to 1.0%;

9.The frequency modulation range and frequency resolution can be set: the frequency modulation range can be set to 30-300Hz, 45-100Hz, 200-300Hz, as needed, to accelerate the tuning process; The frequency resolution can be preset to 0.1Hz, 0.2Hz, 0.5Hz, or 1.0Hz as needed, achieving an optimized balance between tuning efficiency and tuning accuracy;

10.Frequency adjustment is divided into coarse and fine adjustments, and can automatically find the test resonance point to ensure that the resonance frequency does not drift throughout the entire test process.


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