HZCJ-300KV Lightning Impulse Voltage And Current Generator

The Functions Of This System Are

Meet 10kV, 35kV voltage level arrester test;

Satisfy 10kV, 35kV voltage grade oxygen body zinc arrester 8/20 maximum test current 10kA maximum residual voltage 150KV, 30/60us maximum test current 500A, 1/10 valve test, maximum current 10kA impulse current test

Standard:

GB/T 311.1 Insulation and coordination of high-voltage power transmission and transformation equipment

GB/T 16927.1 High Voltage Test Technology Part 1 General Test Requirements

GB/T 16927.2 High Voltage Test Technology Part II Measurement System

GB/T 16896.1 Digital recorder for high voltage impulse test

GB/T11032-2010 AC gapless metal oxide arrester

Detailed Configuration And Technical Parameters

2.1.1 Rated parameter values

1. Nominal voltage: 300kV

2. Rated voltage: 100kV

3. Nominal energy: 30kJ

4. Total shock capacitance: 0.66 microfarads (pulse capacitor 2 microfarads/100kV, 3 sets in total).

5. The total number of stages: 3

6. Standard waveform parameters:

(1) 8/20uS standard impulse current wave

7. The minimum output voltage is greater than 10% of the nominal voltage

8. Duration of use: Above 70% of the rated voltage, it can run continuously by charging and discharging once every 120 seconds, and below 70% of the rated voltage, it can run continuously by charging and discharging once every 60 seconds.

2.1.2 Main components

1. Charging part

(1) Using a constant current charging device;

(2) Adopt oil-immersed charging transformer, secondary voltage 85kV, rated capacity 5kVA;

(3) Using 2DL-200kV/200mA high-voltage rectifier silicon stack, reverse withstand voltage 200kV, average current 0.5A, high-voltage rectifier silicon stack is installed next to the charging transformer:

(4) The high-voltage rectifier silicon stack protection resistor adopts enameled resistance wire and is tightly wound on the insulating tube;

(5) Adopt bilateral constant current charging method;

(6) The constant current charging device is within the range of 10% to 100% of the rated charging voltage, the deviation between the actual charging voltage and the set voltage is not more than ±1%, the instability of the charging voltage is not more than ±1%, and the adjustable accuracy of the charging voltage 1%;

(7) DC resistance voltage divider, use 100kV, 400M, oil-immersed metal film resistor. The low-voltage arm resistor is installed in the bottom flange of the voltage divider, and the voltage signal on the low-voltage arm is introduced into the console with a shielded cable;

(8) The automatic grounding switch adopts the electromagnet to open and close the grounding mechanism. When the test stops, the main capacitor can be automatically short-circuited and grounded through the protection resistor;

(9) Inductors, capacitors, charging transformers (including high-voltage rectifier silicon stacks and polarity switching devices) and their protective resistors for constant current charging, automatic grounding switches and insulating pillars are installed on a chassis;

2. Body part

(1) The main structure adopts a four-column structure. The steel bracket composed of 4 flanges is connected with two capacitors in parallel to form a stable structure. Level stacking, easy disassembly and inspection, and stable overall structure;

(2) The body adopts asymmetric constant current charging method, constant current voltage regulation, continuously adjustable from zero to set voltage, the charging power supply is automatically turned off at the moment of ignition and discharge, and the rated voltage of each stage is 100kV;

(3) 3-level tower structure of main body insulation pillars. Each level includes 1 MWF100-2.0 iron shell oil-immersed pulse capacitor, charging resistance, wave head resistance, wave tail resistance and ignition ball gap, etc.

All synchronised discharge balls are housed in closed insulation with manual adjustment of ball gap via console

(4) The single pulse capacitor is 20.05F, the DC working voltage is 100kV, the capacitor inductance is 0.2H, and the composite film is oil immersed in insulation. Under the normal working state and working environment of the capacitor, the capacitor outlet bushing can withstand a vertical pulling force of 15kg, while ensuring that No damage and oil leakage;

(5) The wave head (front) resistance and wave tail resistance are all of plate-shaped structure, non-inductive winding, and their self-inductance is 2.5H (the purpose of reducing the inductance is to increase the load capacity, for extra-large-capacity loads (such as greater than 5000PF) This item can use a suitable combination of external modulating capacitors and modulating resistors to achieve the purpose of increasing the load.), the joints are all spring crimping type;

(6) The wave head (front) and wave tail resistor brackets can be connected in parallel by four resistors at the same time. The wave head (front) and wave tail resistors have the same length and can be used in common use. The position of the short-circuit rod; it is convenient to make the generator run in series with the short-circuit rod;

(7) Complete with

7.1 1 set of lightning wave head resistance;

7.2 2 sets of wave tail resistors;

7.3 1 set of charging resistor (1 spare);

(8) The first-stage ball gap adopts bilateral opposite polarity triggering, and the second-stage to third-stage ball gap adopts three-gap ball gap ignition, and the synchronization error rate or rejection rate is not more than 2%; .

(9) The distance between the ball gaps at all levels is adjusted linearly by the motor, the control system indicates the charging voltage corresponding to the ball distance, and the transmission structure has upper and lower limit switches;

(10) The ball gap distance can be adjusted manually or automatically on the control system;

(11) The body can be used in parallel for every two or three stages, and the parallel connecting rod adopts a unified connector, which is convenient for connection. The redundant wave modulating resistance can be placed on the equipment without affecting the electrical performance;

(12) Brackets for storing modulating resistors and connecting rods for each test;

(13) Two-end sealed insulating cylinders are used at all levels, and the sealing performance is good;

(14) Anti-corona measures are taken between all levels, and there will be no obvious corona during the whole charging process.

(15) Interstage insulation and mechanical support can withstand 100kV DC voltage without discharge.

(16) The top of the generator is equipped with a pressure equalizing cover.

Residual Voltage Divider

(1) 300KV residual voltage resistor divider. The rated parameter of the high voltage arm resistor is 2.5K.

The divider is equipped with a low voltage arm

Main technical requirements

The high-voltage arm consists of a first-order resistor

Rated parameters 300kV/2.5KΩ

The rated lightning impulse withstand voltage is 300kV

Low voltage arm parameters 1000V/4Ω

Scale factor uncertainty Kε≤1%

Overshoot: β≤20%

Partial response time: ≤100ns