The KDCJ-400kV lightning impulse test device meets the lightning impulse test requirements of distribution transformers, high-voltage switchgear, current transformers and electromagnetic voltage transformers. The nominal voltage is ±400kV. Rated voltage: ±100kV Level: 4 Rated energy: 30kJ The control section should be capable of real-time display of operating parameters, be able to set parameters such as the DC charging voltage, charging time, discharge ball distance, trigger mode and automatic polarity switching of the impact equipment, and monitor and measure its operation.
 
The KDCJ-400kV lightning impulse test device system is developed by Wuhan Kaidi Zhengda Company and is intelligently interconnected with the intelligent safety fence. The instrument and equipment are equipped with communication interfaces, network encryption and protocol conversion devices, and have the functions of direct collection of detection data, automatic transmission and data encryption. It can realize the encrypted upload of detection data to the detection gateway of the tenderer's detection center.

The main body module of the impulse generator of the KDCJ-400kV lightning impulse test device
Nominal voltage: ±400kV
Rated voltage: ±100kV
Level: 4
Rated energy: 30kJ
Impact capacitance: 0.25µF
Rated capacitance/voltage/energy: 1F/100kV/5kJ;
Synchronization range: > 20%
Synchronous discharge out-of-control rate: < 5%
Minimum output voltage: 12kV
Charging voltage instability: < ±1.0%;
Ignition range: 10kV to 100%UH.
 
KDCJ-400kV lightning impulse test device Single ball interception device
Rated voltage: 300kV
Standard deviation of truncation time: < ±0.2µS;
Grade: Level 1
Number of ball gaps: 1 pair
Wave head time: 1.2±30%s
Truncation time range: 2 to 6µS;
Overshoot: less than 5%
Trigger method: Three-gap ball discharge trigger;
Delay method: LC delay is adopted;
Structural type: The ball gap distance of the single ball interception wave is adjusted by the control console through an electric drive mechanism. Electrical connection with the control console enables remote control of the ball distance. Under the applied trigger voltage, the interception device does not move or refuse to move, and the out-of-synchronization rate control is less than 2%. The complete set of equipment can be pushed by hand and moved, with a voltage equalizing cover on the top.
 
Charging module of KDCJ-400kV lightning impulse test device
Wuhan Kaidi Zhengda Company adopts constant current charging devices.
The insulated cylinder oil-immersed charging transformer is adopted. The primary side voltage is 220V, the secondary side voltage is 50kV, and the rated capacity is 5kVA. The transformer is well sealed and there is no oil leakage.
Adopt a high-voltage rectifier silicon stack of 2DL-150kV/100mA;
The protective resistor is made by tightly winding enameled resistance wire around the insulating tube.
Adopt an asymmetric voltage-doubling charging method;
The DC resistance divider uses 100kV/200M/2W oil-immersed metal film resistance, the low-voltage arm resistance is installed in the bottom flange of the divider, the voltage signal on the low-voltage arm is introduced into the control console by shielded cable;
The automatic grounding switch adopts an electromagnet to open and close the grounding mechanism. When the test stops, it can automatically ground the main capacitor through the protective resistor.
The inductors and capacitors for constant current charging are installed in the control console, while the charging transformer, high-voltage rectifier silicon stack, protection resistor, automatic grounding switch and insulating pillar, etc. are installed on a mobile chassis.
 
KDCJ Kaidi Charoen Pokphand Company computer-controlled measurement system
The setting range of each charging voltage level is 0 to 150kV
The working voltage for each charging level is 10 to 150kV
Charging voltage regulation accuracy: 0.1kV
Charging voltage instability: < 1%
Charging voltage boost time:
a. Setting range: 10 to 190 seconds \ nB. Adjustment accuracy: 1 second \ nC. Alarm delay: 2 seconds
 
Silicon controlled rectifier voltage regulating device
Input control voltage: 4-200mA \ nInput power supply voltage: 220V±10% (AC)
Output AC voltage: 10-220V (continuously adjustable) Output AC current: 0-23A
Ignition pulse of pulse amplifier: ≥15kV/100ns

Technical parameters of the measurement system
Inlet voltage: < ±1000V
Sampling rate: 1.25GS/S
Bandwidth: 100MHz
Number of channels: 2
Resolution: 8 bits
Power: < 1000W
 
Functional requirements of the control system
a. Motion control
It can automatically control the discharge ball distance to track the charging voltage and display the discharge ball distance value
Control the automatic grounding of the main body
Preset impact times
b. Charging control
The constant current charging method with thyristor voltage regulation is adopted
The charging process of the generator can be manually and automatically controlled. According to the test requirements, the charging voltage and charging time can be adjusted and the charging voltage value can be displayed
When charging in an automatic control mode, it can make the charging voltage rise according to the required charging curve and automatically stabilize at the pre-set charging voltage value
c. Trigger control
Ignition can be triggered manually, automatically or by alarm
It can trigger the ignition of the interceptor with a delay range of 0 to 9.9s
d. Safety interlock control
The entire system is equipped with complete alarm functions such as warning lights and bells for the test area, as well as control interfaces
It has the function of door interlock
It features automatic grounding and safety grounding interlocking with the system, as well as overcurrent and overvoltage protection functions
It has an emergency stop function
4) Functional requirements of the measurement system:
It features waveform display, analysis, plotting and printing functions. It can set measurement parameters and automatically calculate the data of each waveform. The entire system has three basic functions: automatic recording, automatic analysis and report output.