Flat mouth short-circuit ground wire use method

Flat mouth short-circuit ground wire use method

1. Correctly select the number of short-circuit grounding cables to be suspended according to the requirements of the safety work regulations, correctly select the suspension location, and use the short-circuit grounding wire correctly.

2. The selection of the portable short-circuit grounding wire should be able to withstand the maximum short-circuit current of the suspension power, and the rated short-circuit current value shall not be less than the maximum fault current of the suspension power. When the reclosing is not released, the secondary short-circuit current shall also be considered. The impact of current surge on the short circuit current value of the short-circuit grounding cable.

3. The length of the short-circuit grounding wire should be suitable for the distance between the equipment size and the fixed grounding point. The squared rated current and the rated time quadrature value are not less than the product of the squared fault current and the failure time. If the length of the grounding wire is less than 1.2 times the distance of the connection point, it may result in a more severe stress than in the type test, so that the work is too high at the time of the short circuit and the grounding wire oscillates strongly.

4, according to the requirements of convenient suspension of short-circuit ground wire to choose the type of clip. The selection of the grounding operating rod should be consistent with the rated voltage of the system at the suspension point. When suspending the short-circuited grounding wire, the worker, the grounding wire and the charged equipment must be kept at the necessary safety distance. The personnel working before hanging up the grounding wire should keep a safe distance from the grounding wire.

5. Before using the portable short-circuit grounding wire, the experience confirms that the power has been cut off and that no voltage is available on the equipment. Connect the grounding clamp to the grounding net first, then the operating rod clamps the wire end clamps separately. Removing the segment route ground wire on the device wire is contrary to the appeal.

6. When installing a short-circuit grounding wire, the distance between him and the charged equipment should be considered in consideration of the influence of the grounding wire's swing. The safety distance should not be less than the value specified in the safety work regulations.

7. Suspension points can be used if there is no fixed grounding point, and the temporary grounding point can be temporarily grounded. The depth of buried grounding rod buried in the ground should not be less than 0.6M.

8. The portable short-circuit grounding wire should be stored in a special place where air is circulated and where the environment is dry. Before every use, check whether it is in good condition. The clamps were found to be cracked, the connection was loose, and the sheath was damaged. Soft copper wire is exposed and should not be used.

9, should be in accordance with the requirements of circuit safety rules for regular inspections (check items with the factory inspection)

10. Passed short-circuit grounding cables that pass the test should generally be disposed of after being short-circuited.

Flat mouth short-circuit ground wire Product introduction:

The XJ three-phase short-circuit grounding wire is a new generation product that our company recently developed. The product's performance indicators are in line with the requirements of all issued SD332-89 "portable short-circuit ground wire technical standards." On August 10, 2001, the product passed the type test of the power safety tool inspection and testing center. The test project is full-scale.

2. The XJ series portable short-circuit ground wire is composed of insulated operating rod, wire clip, short-circuit wire, grounding wire, grounding ruizi, bus clip, ground clamp, etc. The wire clips and ground clips are made of high-quality aluminum alloy die-casting with high strength. After surface treatment, the surface of the clamp is not suitable for oxygen. The operating rod is made of imported epoxy resin and is made of color tube. It has good insulation performance, high strength, light weight, bright color, smooth appearance and excellent processing. It is a technical product in the same manufacturing field.

3, XJ series of portable short-circuit grounding wire can be divided into phase-type grounding line, phase-type grounding line. The use of different voltage, there is a single, multi-section operating stick. Short-circuit grounding wire is used for substation (flat clamp) and circuit (round clamp)

Flat mouth short-circuit ground wire parameters

Various voltage level device names

Insulation part length (mm)

Handshake length (mm)

Total length

(mm)

Below 10KV electrical equipment

According to the convenience of work, no provisions are made

10KV equipment and transmission lines

700

300

100

35KV equipment and transmission lines

900

600

1500

63KV equipment and transmission lines

1,000

600

1600

110 KV equipment and transmission lines

1300

700

2000

220 KV equipment and transmission lines

2100

900

3000

330 KV equipment and transmission lines

3000

1100

4100

500 KV equipment and transmission lines

4100

1400

5500

220-500 KV Transmission Line Insulated Overhead Ground

700

300

1,000

Laboratory and test equipment grounding

700

300

1,000

3, grounding operation rod mechanical strength (Table 2)

Static tension (N)

Bending resistance

1470

Two times the weight of the working part of the grounding bar

4. Insulation characteristics of the grounding bar (Table 3)

Rated operating voltage

(KV)

10 and

the following

35

63

110

220

330

500

220-500 insulated overhead wire

test

equipment

Preventive test voltage

(KV)

44

93.5

167

219

438

567

758

44

44

Factory test voltage (KV)

48

102

184

241

482

634

836

48

48

Type test voltage (KV)

53

112

202

265

530

679

920

53

53

Wet voltage test voltage (KV)

40

90

159

210

400

600

-

40

40