Debugging of lightning impulse voltage generator test device

Impulse voltage generatorIt is a device that generates impulse voltage waves, used to test the insulation performance of power equipment to withstand atmospheric and operational overvoltages. The impulse voltage generator can generate standard lightning impulse voltage waveforms, lightning impulse voltage waveforms, standard operational impulse voltage waveforms, and user non-standard impulse voltage waves (including steep waves).

This seriesImpulse voltage generatorIt can conduct impulse voltage tests and other scientific research on insulator strings, long air gaps, bushings, transformers, and other test samples.

Features

1. System Description

This system consists of an industrial control computer, a programmable logic controller (PLC) voltage regulator, an ignition pulse amplifier, a PLC operation control cabinet, a digital oscilloscope, and a printer. By communicating with PLC through optical fiber and using professional software programming to design a user-friendly control interface, the system's operating parameters and measurement results are displayed in real-time in digital form on the computer interface. All settings, operation, measurement parameters, and graph analysis of the impact system can be completed on the computer, including setting the DC charging voltage, charging time, discharge ball distance, trigger mode, etc. of the impact equipment, and monitoring and measuring its operating status. Each function is relatively independent and complementary to each other. It has two parts: computer automatic control and manual emergency control.

2. Control system function

(1) Action control

Can automatically control the distance between the discharge ball and track the charging voltage, and display the value of the discharge ball distance

After the experiment is completed, control the body to automatically ground

Pre set number of impacts, automatic polarity conversion

There is a fault display function

The distance between steep waves increases and decreases

(2) Charging control

Intelligent constant current charging control, using fast charging when the capacitor voltage differs significantly from the set voltage, and slow charging when approaching the set voltage. It can manually and automatically control the charging process of the generator, adjust the charging voltage and time according to test requirements, and display the charging voltage value.

When using self-control for charging, the charging voltage can rise according to the required charging curve and automatically stabilize at the pre-set charging voltage value.

(3) Trigger control

Can trigger ignition manually, automatically, or with an alarm

(4) Safety interlock control

The entire system has complete alarm functions and control interfaces for test areas such as warning lights and bells

Equipped with door interlocking function

Equipped with automatic grounding and system interlocking, over-current, over-voltage and other functions

Equipped with emergency stop function

There is a fault display function

(5) Extended functionality

Can communicate and exchange data with other computers through serial ports

Can form an integrated measurement and control operating system with computer measurement and analysis systems

Manual emergency function

Automatic relay and automatic grounding release of charging equipment

Manual adjustment of ignition ball gap distance

constant current charging

Manual adjustment of voltage and charging time

Manually trigger to emit ignition pulse

Manual alarm bell

Automatic overcurrent protection

Manually control the start and stop of high and low voltage tests

Status indication of control box

Input current indication of charging transformer

Input voltage indication of charging transformer

First level capacitor charging voltage value voltage indication

Ignition ball gap indication

Other indicator lights and symbols

Charging power supply device: Input voltage AC380V

3. Functional requirements for the measurement system

a. The measurement system uses a Tektronix oscilloscope as the data acquisition core, with a dedicated high-voltage attenuator at the front end. The high-voltage measurement signal transmitted from the voltage divider or splitter is attenuated without distortion into a measurable low-voltage signal, which is input into the Tektronix oscilloscope to record the input voltage. The digitized signal is then transmitted to the computer through optical fiber for analysis and calculation. The measurement software adopts the ATC measurement and control professional software developed by Shanghai Jiao Tong University (registered with the National Copyright Administration and evaluated according to GB/T and IEC standards). The oscilloscope has four independent measurement channels, two of which can be triggered simultaneously for measurement and display, making it easy to observe the phase shift trigger angle; The data acquisition and measurement analysis system used has functions such as automatic recording, automatic analysis, and waveform recovery report output. The waveforms measured by two measurement channels can be displayed or recovered in the same window, and their phase correlation can be displayed correctly; The waveform can be zoomed in and out in the window.

b. Automatically set the oscilloscope based on changes in test voltage and polarity

c. The sampling characteristics of the oscilloscope can be finely adjusted according to the actual situation

d. Automatically transmit the waveform collected by the oscilloscope to the computer

e. Computer automatic testing and analysis of waveform parameters

f. Automatically save waveform data files

g. Can zoom in and restore waveforms on the screen at will

h. Can perform waveform comparison

i. Oscilloscopes and microcomputer systems have strong resistance to electromagnetic interference, and all technical specifications should meet the requirements of the third reference standard

4. Basic system configuration

A. Equipped with Lenovo high-end computers as waveform analysis and report processing terminal devices

B. Functional circuit board

C. Constant current voltage regulating device

D. Ignition pulse amplifier

E. TEK DPO-2012B Digital Oscilloscope

F. Vertical resolution of 8-bit, bandwidth of 100MHz, maximum sampling rate of 2.5GS/s, recording length of 10k, maximum duration captured at the highest sampling rate (all channels) of 2ms, maximum input voltage of 300V

G. Computer System: Intel 2.4G CPU, 2GB RAM, 320G hard drive

H. ATS data analysis and control software

I. Isolation purification protection power supply

J. PLC operation control cabinet, computer workbench

K. With the advancement of computer technology, free software upgrade services are provided to users. The programmable controllers, relays, and contactors used in the control system are all joint venture and imported components from abroad. The measurement and control system has long-term stability and reliability

L. The entire system has strong anti-interference ability and measures to prevent location elevation

The computer operation control system and computer measurement analysis system are combined in the console.

technical indicators

1. Nominal voltage: ± 1050kV

2. Rated voltage: ± 150kV

3. Rated charging voltage: ± 150kV

4. Nominal energy: 78.75kJ

5. Total impulse capacitance: 0.143mF (single pulse capacitor 1mF/150 kV, 7 units in total)

6. Level: 7

7. Class capacity: 1mF

8. Level energy: 11.25 kJ

9. Impulse voltage waveform parameters: When the load capacitance is below 300-4000PF, it can generate:

Standard lightning impulse voltage full wave 1.2 ± 30% ms/50 ± 20% ms,

The amplitude is ± 3%, and the oscillation at the peak is not greater than 5% of the amplitude;

The standard operating impulse voltage waveform is 250 ± 20% ms/2500 ± 60% ms; the parameters and deviations of these two impulse voltage waveforms comply with the requirements of relevant national GB311 and GB16927 standards.

10. Output voltage:>10% Un

11. Synchronization range: The voltage level is within the range of 20% to 100% of the rated voltage, and the positive and negative polarity synchronization range is not less than 20%

12. Synchronous discharge out of control rate:<2%

13. Body inductance £ 55 μ H

14. Ignition range: 10% -100% Un

15. Charging voltage instability ＜ ± 1.0%

16. Deviation between charging voltage and reference voltage ＜ ± 1.0%

17. Voltage utilization factor: When the load capacitance is below 1000PF, the voltage utilization factor of standard lightning wave is ≥ 90%, and the voltage utilization factor of standard operating impulse voltage full wave is ≥ 85%; When the load capacitance is below 3000PF, the voltage utilization coefficient of standard lightning wave is ≥ 85%, and the voltage utilization coefficient of standard operating impulse voltage full wave is ≥ 75%.

18. Duration: Continuous operation can be achieved by charging and discharging every 120 seconds above 70% rated voltage, and continuous operation can be achieved below 70% rated voltage.