1800kV Multistage Lightning Impulse Voltage Generator Test Equipment

Tech Data

1. Nominal voltage: ±1800kV

2. Rated voltage: ±200kV

3. Nominal energy:180 kJ

4. Impact the total capacitance: 0.111mF (2.0mF /100 kV single pulse capacitor, a total of 18)

5. Series: level 9

6. Impact voltage waveform parameters:

(1)Standard lightning impulse voltage full wave, ±1.2/50ms voltage utilization factor > 85% (no-load 300PF > 90%);

(2)Truncation wave: truncation time (2-6) ±10%s, zero-crossing coefficient ≤0.3%;

(3)Standard operating impulse voltage wave: 250±20%ms /2500±60%ms

Technical Description of Main Parts

1. DC Charging Part

(1)Constant current charging device is adopted;

(2)using oil-immersed charging transformer, the secondary voltage is 85kV , rated capacity of 30 kvA;

(3)Using 2DL-300 kV / 500 mA high voltage rectifier silicon stack，The reverse withstand voltage³300kV, the average current ³ 0.5A, the high-voltage rectifier silicon pile is installed next to the charging transformer, the charging voltage polarity can be reversed automatically by the transmission mechanism. There are polarity switch buttons on the console.

(4)High-voltage rectifier silicon stack protection resistance using enameled resistance wire is tightly wound around the insulation tube；

(5) It adopts bilateral symmetrical constant current charging mode；

(6)During automatic control, the constant current charging device is within 10%~100% of the rated charging voltage range, the actual charging voltage and the setting voltage deviation are not more than ±1%, the charging voltage instability is not more than ±1%, The adjustable accuracy of charging voltage is 1%.

(7)Two DC resistance voltage dividers, using 100kV, 300MΩ oil-immersed metal film resistance. 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 by shielded cable.

(8)The automatic grounding switch USES the electromagnet to separate the grounding mechanism. When the test stops, the main capacitor can be automatically grounded by protective resistance.

(9)Constant current charging inductance, capacitance in the console, charging transformer, high voltage rectifier silicon reactor, protection resistance, automatic grounding switch and insulation pillar are installed on a mobile chassis.

2. The Ontology Part

(1) The main structure adopts a four-column structure. The steel body bracket consisting of four flanges is connected with two capacitors in parallel, forming a stable structure consisting of 1 level, and the main equipment is 9 stages, forming a combined tower structure. Level stacking, easy to disassemble and test, and stable overall structure;

(2) The main body adopts asymmetric constant current charging mode, constant current voltage regulation, continuously adjustable from zero to set voltage, and the charging power supply is automatically turned off at the instant of ignition and discharge, and the rated voltage of each stage is 200kV;

(3) 9-stage tower structure with body insulation pillars. Each stage includes 2 MWF100-2.0 iron casing oil-immersed pulse capacitors, charging resistors, wave head resistance, wave tail resistance and ignition ball gap, etc.

All synchro discharge balls are housed in a closed insulation, which can be manually adjusted by the console to automatically adjust the ball gap and provide clean air for drying;

(4) A single pulse capacitor is 2 ± 0.05 mF, dc voltage ±100 kV, capacitor inductor £0.2 mH, oil-immersed insulation composite membrane, capacitor under normal working condition and working environment, the capacitor for casing to withstand vertical tensile 15 kg, at the same time to ensure no damage and leakage of oil;

(5) Wave head (front) resistance and wave tail resistance are of plate structure and non-inductive winding, with self-inductance £2.5mH (the purpose of reducing the inductance is to increase the load capacity. For the load with extra large capacity, an appropriate combination of external regulating capacitor and regulating resistor can be adopted to achieve the purpose of increasing the load.) , the joints are all spring-pressure relay type;

(6) Wave header (formerly), wave tail resistance bracket by four resistors in parallel, wave head (front), equal to the length of the tail resistor can be generic, and each one has stored excess modulated wave resistance the short-circuit the position of the lever; short-circuit rod connectors facilitate the generator series run;

(7) Full set

7.1 lightning wave head resistance; 4 sets

7.2 wave tail resistance 4 sets

7.3 charging resistors (1 pcs reserve ) 1 set

Load capacitance (with one moving base, capacitors can be connected in parallel) 200kV/2000pF 2 sets

Cutoff loop damping：Braiding resistance 60Ω（10W、20W have a tap）1 set

Wave-modulated inductor（200μH、400μH） 1 set

Support resistance 200Ω、300Ω、400Ω（With mobile stand） Each one

(8) The first-stage ball gap adopts bilateral bipolar triggering, and the second- to ninth-level ball gap adopts three-gap ball gap ignition, and the synchronous misoperation rate or rejection rate is not more than 2%; the synchronization range ≥20%. .

(9) The ball gap distance of each level is linearly adjusted by the motor drive, the control system indicates the charging voltage corresponding to the ball pitch, 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 main body can be used in parallel every two or more stages, and the parallel connecting rod adopts a unified connector to facilitate the exchange. The excess modulating resistor can be placed on the device without affecting the electrical performance;

(12) The main body is equipped with an insulating ladder, and its load capacity is designed according

to 120kg, so that the staff can replace the wave-modulating components, and each stage of the test stores the tuning resistor and the bracket of the connecting rod;

(13) The two ends of the body are insulated with two ends, and the sealing performance is good;

(14) Anti-corona measures are taken between the levels, and no obvious corona will appear during

the whole charging process.

(15) Equipped with a safety grounding system, it is convenient for the test personnel to climb the body to replace the resistance or start the grounding system during maintenance, and all the capacitors are shorted and grounded.

(17) Inter-stage insulation and mechanical support can withstand 220kV DC without generating discharge.

(18) The climbing insulation ladder installed on the body, the insulation ladder is convenient and safe and reliable, and the body machinery can fully meet the mechanical and electrical strength.

(19) The top of the impact generator is equipped with a voltage equalizing cover consisting of a turtle-shaped aluminum sheet.

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