300kV/100pF High Voltage Standard Capacitor-Huazheng Electric Manufacturing (Baoding) Co., Ltd

YL300-100 300kV/100pF High Voltage Standard Capacitor

I.Application

Standard capacitors are an indispensable and important instrument for every multi-functional modern high-voltage laboratory. SF6 insulated standard capacitors are mainly used in bridge circuits to measure the dielectric loss factors and capacity of test products including cables, capacitors, bushings, transformers and power transformers.

YL series standard capacitors can also be used as a high-voltage part of the capacitor voltage divider. Its good temperature coefficient and voltage coefficient ensure ultra-high accuracy of voltage measurement. With the low-voltage arm of the amplifier, it can be used for the calibration of voltage transformers. Used for accurate voltage measurement on the high-voltage output side of the transformer.

The standard capacitors of YL series standard capacitors higher than 800kV can provide C12 standard capacitance and C13+QND standard voltage divider, which can be provided by traditional capacitors. An additional approximately 200pF coupling capacitor can also be provided for partial discharge measurement.

YL series standard capacitors have a unique internal partial pressure structure, which requires a strong high-voltage withstａnd capability even in a 95% non-condensing humidity environment. We use a special stainless steel material to ensure the perfect combination of temperature and voltage coefficient.

Standard capacitors used indoors can be equipped with a double-layer circular equalizing ring or circular disc equalizing ring. For standard capacitors used outdoors, we are equipped with a double-layer equalizing ring made of aluminum alloy tubes, which can guarantee the connection with other high-voltage circuits. Partially without partial discharge connection.

II. Design Features:

Based on more than 20 years of industry experience, in the design stage, we developed two different standard capacity designs. For the standard capacity below 600kV, we use the traditional standard capacity design. The design principle is more compact and compact. Compared with the standard capacity of the same industry, our size is only about 1/2 to 1/3 of the counterparty.

◆ For standard capacitors above 600kV, we use a new internal voltage division structure, which can smooth the electrical strength of the entire external insulation, allowing our standard capacitors to operate for a long time at the rated voltage in a high humidity environment.

◆ All the electrodes in the standard volume are made of special stainless steel, which can ensure the best temperature and voltage coefficient stability.

◆ Use perfect gas leakage detection technology and technology to realize that standard capacitors can guarantee less than 1% pressure leakage per year.

◆ The pressure gauge uses the German brａnd of WiKA, and the joint is regarded as the German brａnd of DILO, ensuring world-class quality.

III. Based on the standard:

JB/T 1811-1992 High Voltage Standard Capacitor Appraisal Regulations

GB311.1-1997 Insulation coordination for high-voltage power transmission equipment

GB/T16927.1-1997 High Voltage Test Technology Part 1: General Test Requirements

GB/T16927.2-1997 High Voltage Test Technology Part 2: Measurement System

STIEA/JJF020-2005 Calibration Specification for High Voltage Capacitance Bridge

JJG563-2004 Verification Regulations for High Voltage Capacitor Bridge

IV. Working Condition:

1. Altitude: ≤1500m

2. Ambient temperature: 0℃～＋45℃

3. Maximum daily temperature difference: ≤25℃

4. Relative humidity of air: ≤95% (20℃)

5. Seismic intensity: ≤8

6. Use environment: indoor

7. Maximum impact load: 3g

8. Grounding resistance: ≤1W

9. Background partial discharge: ≤2pC

V. Technical Parameters:

1. High voltage standard capacitor

Model: YL300-100

1) Rated voltage: 300kV

2) Withstａnd voltage: 330kV (1.1UN), 1min

3) Rated frequency: 10Hz-1000Hz

4) Rated capacity: 100pF (C12)

5) Capacity deviation: ±0.5%

6) Capacity stability: <0.01% ear="">

7) Accuracy of capacitance data: <±0.05%>

8) At rated frequency, the capacitor tanδ at rated voltage should be less than 1×10-5;

9) The capacitor is filled with SF6 gas, and the rated pressure is 4bar

10) The absolute value of the pressure coefficient is not more than 2.2×10-3/0.1Mpa;

11) The absolute value of the capacitor voltage coefficient is not more than 3×10-5;

12) The absolute value of the capacitance temperature coefficient is not more than 3×10-5/℃;

13) The frequency drift is not more than 1×10-5;

14) The capacitor can withstａnd the test of 2 times the rated air pressure, which lasted 72 hours;

15) Tightness: annual leakage is not more than 0.25%;

16) The low-voltage side of the 16 capacitor is equipped with a secondary discharge tube protection device to protect the safety of operators. The standard capacity comes with a secondary terminal box and connecting cable. The Lemo plug is equipped with a self-locking function to prevent the plug from loosening;

17) Measuring electrode-to-shielding electrode and grounding electrode, shielding electrode-to-grounding current at 3kV for 1 min or measuring the insulation resistance value with an insulation tester not less than 500MΩ;

18) Continuous operation under 18 rated voltage, partial discharge is less than 2pC;

19) Long-term operation under rated voltage;

20) Total package weight: about 450kg

VI. Complete equipment:

1. 300kV standard capacitor body 1 unit

2. Mobile chassis 1 pc

3. Dedicated equalizing ring 1 pc

4. Dielectric loss special measuring line 2 (50 meters)

5. Junction box 1 pc

6. Factory report and certificate 1 copy

7. Manual 2 copies

8. Inflatable connector (DILO matching) 2 pcs