CN104008828B - A kind of discharging gap apparatus - Google Patents

Abstract

The invention discloses a discharge gap device. The discharge gap device is located on a string of ground wire insulators. The discharge gap device includes a first fastener, a second fastener, a first fixing plate, a second fixing plate, an upper The electrode and the lower electrode, the head end of the first fixing plate is fixed to the high voltage end of the ground wire insulator string through the first fastener, the end of the first fixing plate is connected to the head end of the upper electrode, and the end of the upper electrode is the arcing end. The head end of the second fixing plate is fixed to the low-voltage end of the ground wire insulator string through the second fastener. void. Beneficial effects of the invention: the gap between the ground wire insulators is adjustable, and if the gap does not meet the performance requirements of the ground wire for ice melting or lightning protection in actual engineering, it can be adjusted, and the operation is convenient.

Description

A discharge gap device

technical field

The invention relates to a discharge gap device.

Background technique

The discharge gap is a gas discharge device commonly used in high-voltage technology. It is generally used to control the on-off of the high-voltage circuit. The air gap in the middle of the structure is used to discharge in advance to prevent various overvoltages (such as lightning, operation, etc.) from affecting the high-voltage sleeve. The protection of high-voltage equipment such as pipes is similar to lightning arresters and overvoltage protectors. The discharge gap usually consists of two electrodes, one connected to the high-voltage end and the other connected to the low-voltage end. The two electrodes are insulated. When the voltage between the two electrodes reaches the breakdown voltage, the insulation is broken down into conduction. state, after the freewheeling disappears, due to the self-recovery of the insulation, the two electrodes become insulated, and the circuit is disconnected again.

The transmission line is located in the wilderness and is vulnerable to lightning strikes. The direct lightning overvoltage caused by lightning strikes on the line and the induced lightning overvoltage caused by the lightning strike on the ground near the line are the so-called atmospheric overvoltages that often occur on transmission lines. The accidents caused by insulator flashover, line tripping and lightning wave invasion and damage to electrical equipment in substations account for a large part of the total accidents in the power grid.

Therefore, in order to solve the above problems, a new technical solution is provided.

Contents of the invention

The invention provides a discharge gap device.

The technical scheme adopted in the present invention is:

A discharge gap device, the discharge gap device is located on the ground wire insulator string, the discharge gap device includes a first fastener, a second fastener, a first fixing plate, a second fixing plate, an upper electrode and a lower electrode , the head end of the first fixing plate is fixed to the high-voltage end of the ground wire insulator string through the first fastener, the end of the first fixing plate is connected to the head end of the upper electrode, and the end of the upper electrode is the arcing end, so The head end of the second fixing plate is fixed to the low-voltage end of the ground wire insulator string through the second fastener, the end of the second fixing plate is connected to the head end of the lower electrode, the end arc end of the lower electrode, and the arc end end There is a gap with the arc end.

The arc striking end is bent from bottom to top, and the arc striking end is bent from top to bottom.

The angle at which the arc striking end bends from bottom to top and the angle at which the arc striking end bends from top to bottom are both 30-45°.

A discharge gap device, the discharge gap device is located on the ground wire insulator string, the discharge gap device includes a first fastener, a second fastener, a third fastener, a fourth fastener, a first fixing plate, the second fixed plate, the upper electrode and the lower electrode, the head end of the first fixed plate is fixed to the high voltage end of the ground wire insulator string through the first fastener, and the end of the first fixed plate is connected to the high voltage end of the ground wire insulator string through the third fastener The head end of the upper electrode is fastened vertically, the head end of the second fixing plate is fixed to the low-voltage end of the ground wire insulator string through the second fastener, and the end of the second fixing plate is connected to the head end of the lower electrode through the fourth fastener. Fasten vertically, the lower electrode bends obliquely upwards from the middle, and there is a gap between the end of the upper electrode and the curved section of the lower electrode.

The inclination angle of the middle part of the lower electrode is 130-140°.

A discharge gap device, the discharge gap device is located on the ground wire insulator string, the discharge gap device includes a first fastener, a second fastener, a first fixing plate, a second fixing plate, an upper electrode and a lower electrode , the head end of the first fixing plate is fixed to the high-voltage end of the ground wire insulator string through the first fastener, the end of the first fixing plate is connected to the head end of the upper electrode, and the end of the first fixing plate is connected to the head end of the upper electrode Forming an angle, the head end of the second fixing plate is fixed to the low-voltage end of the ground wire insulator string through a second fastener, the end of the second fixing plate is connected to the lower electrode head end, and the end of the second fixing plate is connected to the lower electrode head The end is vertical, the lower electrode starts to bend upwards from the middle, there is a gap between the connection between the first fixed plate and the upper electrode and the bend of the lower electrode, and a tip is installed in the gap.

The upper electrode is made of flat iron, and the lower electrode is made of round steel.

The angle formed between the end of the first fixing plate and the head end of the upper electrode is 45-135°, and the angle of inclination and bending in the middle of the lower electrode is 130-140°.

The beneficial effects of the present invention are: the gap between the ground wire insulators is an adjustable gap, if the gap does not meet the performance requirements of the ground wire melting ice or lightning protection in actual engineering, it can be adjusted, and the operation is convenient;

It is an effective lightning protection device. It is installed at the end of the insulator string with a certain gap. It has a simple structure and is easy to maintain. It is used in conjunction with the automatic reclosing switch in the system. It can not only ground the lightning current in time, but also provide uninterrupted power supply to users. , so as to prevent flashover on the surface of the insulator, protect electrical equipment, and maintain the normal operation of the line;

Installing discharge gaps on the ground wire insulator strings, compared to insulating the lightning wires to the ground through small gaps, only the gaps break down when lightning strikes, and the lightning wires are grounded, which reduces the additional loss caused by the current in the lightning wires during normal operation of the line. , and the lightning protection line can also be used as a communication line;

When the gap is discharged, the arc is formed at the closest distance between the electrodes, and then the arc formed on the upper part of the horn-shaped gap is rapidly elongated. This kind of arc is generally easy to extinguish, and the electrode will be burned at the end of the horn gap due to the pull-up of the arc. There will be no burns at the place with the smallest gap distance, so as to ensure the correct action next time;

A small tip is added at the gap to increase the inhomogeneity of the gap electric field.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of Example 1, wherein a is a hanging string fitting, and b is a tension string fitting.

Fig. 2 is a schematic structural diagram of Example 2, wherein a is a hanging string of fittings, and b is a strain-resistant string of fittings.

Fig. 3 is a schematic structural diagram of Example 3, wherein a is a hanging string fitting, and b is a tension string fitting.

Among them: 1. First fastener, 2. Second fastener, 3. First fixed plate, 4. Second fixed plate, 5. Upper electrode, 6. Lower electrode, 7. Ground insulator string, 8 , the arc end, 9, the arc end, 10, the third fastener, 11, the fourth fastener, 12, the tip.

detailed description

In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the embodiments and accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

Example 1

As shown in Figure 1, a discharge gap device of the present invention is located on the ground wire insulator string, and the discharge gap device includes a first fastener 1, a second fastener 2, a first fixing plate 3, The second fixed plate 4, the upper electrode 5 and the lower electrode 6, the head end of the first fixed plate 3 is fixed to the high voltage end of the ground wire insulator string 7 through the first fastener 1, and the end of the first fixed plate 3 is connected to the upper electrode 5 The end of the upper electrode 5 is the arcing end 8, the head end of the second fixed plate 4 is fixed to the low-voltage end of the ground wire insulator string 7 through the second fastener 2, and the end of the second fixed plate 4 is connected to the lower electrode 6. The head end, the end of the lower electrode 6, the arc striking end 9, there is a gap between the arc striking end 8 and the arc striking end 9, the arc striking end 8 is bent from bottom to top, the arc striking end 9 is bent from top to bottom, and the arc striking end 8. The angle of bending from bottom to top and the angle of bending from top to bottom of arc starting end 9 are both 30-45°. When the gap is discharged, the arc is formed at the closest distance between the electrodes, and then the arc formed by the upper part of the double horn-shaped gap is quickly Elongated, this kind of arc is generally easy to extinguish, and it will also be pulled up by the arc, and the electrodes will be burned at the end of the horn gap, but the gap distance will not be burned, so as to ensure the correct operation next time.

It is an effective lightning protection device. It is installed at the end of the insulator string with a certain gap. It has a simple structure and is easy to maintain. It is used in conjunction with the automatic reclosing switch in the system. It can not only ground the lightning current in time, but also provide uninterrupted power supply to users. , so as to prevent flashover on the surface of the insulator, protect electrical equipment, and maintain the normal operation of the line;

Installing discharge gaps on the ground wire insulator strings, compared to insulating the lightning wires to the ground through small gaps, only the gaps break down when lightning strikes, and the lightning wires are grounded, which reduces the additional loss caused by the current in the lightning wires during normal operation of the line. , and the lightning protection line can also be used as a communication line.

Example 2

As shown in Figure 2, a discharge gap device of the present invention is located on the ground wire insulator string 7, and the discharge gap device includes a first fastener 1, a second fastener 2, and a third fastener 10. The fourth fastener 11, the first fixed plate 3, the second fixed plate 4, the upper electrode 5 and the lower electrode 6, the head end of the first fixed plate 3 is fixed to the ground wire insulator string 7 through the first fastener 1 The end of the first fixed plate 3 is vertically fastened to the head end of the upper electrode 5 through the third fastener 10, and the head end of the second fixed plate 4 is fixed to the ground wire insulator string 7 through the second fastener 2 The end of the second fixed plate 4 is vertically fastened to the head end of the lower electrode 6 through the fourth fastener 11, the lower electrode 6 is bent upwards from the middle, and the curved section between the end of the upper electrode 5 and the lower electrode 6 is left There is a gap, the inclination angle of the middle part of the lower electrode 6 is 130-140°, the gap between the upper electrode 5 and the lower electrode 6 can be adjusted by the third fastener 10 and the fourth fastener 11 respectively, when the gap is discharged, The arc is formed at the place where the electrodes are closest to each other, and then the arc formed on the upper part of the single horn-shaped gap is rapidly elongated. This kind of arc is generally easy to extinguish, and it will also be pulled up by the arc. The electrodes are burned at the end of the horn gap, and the gap distance is the smallest. The place will not be burned, so as to ensure the correct action next time.

It is an effective lightning protection device. It is installed at the end of the insulator string with a certain gap. It has a simple structure and is easy to maintain. It is used in conjunction with the automatic reclosing switch in the system. It can not only ground the lightning current in time, but also provide uninterrupted power supply to users. , so as to prevent flashover on the surface of the insulator, protect electrical equipment, and maintain the normal operation of the line;

Installing discharge gaps on the ground wire insulator strings, compared to insulating the lightning wires to the ground through small gaps, only the gaps break down when lightning strikes, and the lightning wires are grounded, which reduces the additional loss caused by the current in the lightning wires during normal operation of the line. , and the lightning protection line can also be used as a communication line.

Example 3

As shown in Figure 3, a discharge gap device of the present invention, the discharge gap device is located on the ground wire insulator string 7, the discharge gap device includes a first fastener 1, a second fastener 2, a first fixing plate 3 , the second fixed plate 4, the upper electrode 5 and the lower electrode 6, the head end of the first fixed plate 3 is fixed to the high voltage end of the ground wire insulator string 7 through the first fastener 1, and the end of the first fixed plate 3 is connected to the upper electrode 5, the end of the first fixed plate 3 forms an angle with the head end of the upper electrode 5, the head end of the second fixed plate 4 is fixed to the low-voltage end of the ground wire insulator string 7 through the second fastener 2, and the second fixed plate 4 The end of the second fixed plate 4 is connected to the head end of the lower electrode 6, the end of the second fixed plate 4 is perpendicular to the head end of the lower electrode 6, and the lower electrode 6 bends upwards from the middle, and the connection between the first fixed plate 3 and the upper electrode 5 and the lower electrode 6 There is a gap in the bending part of the gap and a tip 12 is installed at the gap, the upper electrode 5 is made of flat iron, the lower electrode 6 is made of round steel, and the angle formed between the end of the first fixed plate 1 and the head end of the upper electrode 5 is 45° -135°, the oblique bending angle of the middle part of the lower electrode 6 is 130-140°, and a small tip is installed at the gap to increase the unevenness of the electric field in the gap.

It is an effective lightning protection device. It is installed at the end of the insulator string with a certain gap. It has a simple structure and is easy to maintain. It is used in conjunction with the automatic reclosing switch in the system. It can not only ground the lightning current in time, but also provide uninterrupted power supply to users. , so as to prevent flashover on the surface of the insulator, protect electrical equipment, and maintain the normal operation of the line;

Installing discharge gaps on the ground wire insulator strings, compared to insulating the lightning wires to the ground through small gaps, only the gaps break down when lightning strikes, and the lightning wires are grounded, which reduces the additional loss caused by the current in the lightning wires during normal operation of the line. , and the lightning protection line can also be used as a communication line.

The electrical test requirements of the discharge gap of the present invention:

According to the function and design requirements of the discharge gap device, the following electrical type tests should be done.

(1) Lightning impulse voltage test or 50% full wave impulse flashover voltage test

This test is mainly to measure the electric strength of the discharge gap against lightning overvoltage. In order to protect the insulator, its electric strength must be less than the impact flashover voltage of the insulator string. Surface flashover.

According to the requirements of the IEC standard, the 1.2/50 standard shock waveform is used for lightning shock simulation. The commonly used impulse flashover voltage with a probability of 50% is its lightning dry withstand voltage. The test can be carried out by the insertion method or the lifting method. After the value is converted to the standard atmospheric state, it is generally 6 to 7 times the line phase voltage.

(2) Power frequency wet flashover voltage test

According to the requirements of IEC standards, the arithmetic mean value of the voltage causing power frequency flashover measured by applying standard artificial force on the gap can also be taken as the flashover voltage with a probability of 50%.

Its purpose is to assess the ability of the gap to withstand working voltage and operating overvoltage under line operating conditions. Its value is generally 4~4.5 times the phase voltage of the line.

(3) Power frequency wet withstand voltage

Operating experience shows that electrical equipment subjected to a one-minute AC withstand voltage test can generally guarantee safe operation. In the IEC standard, 75% of the predetermined test voltage is generally taken, and then a voltage level is increased at a speed of 2% of the test voltage per second, and the number can be taken after maintaining for one minute without flashover or breakdown. However, it can also be maintained at 95% of the power frequency wet flashover voltage for one minute. If flashover still occurs, it can be tolerated by dropping 2%.

(4) Radio interference test

The discharge gap is installed on the insulator string, which will inevitably increase its radio interference. According to the requirements of the 275kV insulator string in the Malaysian tender, it is less than 46db.

(5) Initial corona voltage test

The corona test requirements for the discharge gap are similar to the corona requirements for other fittings with the same voltage level and the same altitude.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any other form, and any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope of protection claimed by the present invention .

Claims (1)

1. A discharge gap device, characterized in that: the discharge gap device is located on the ground wire insulator string, and the discharge gap device includes a first fastener, a second fastener, a first fixing plate, and a second fixing plate , the upper electrode and the lower electrode, the head end of the first fixing plate is fixed to the high voltage end of the ground wire insulator string through the first fastener, the end of the first fixing plate is connected to the head end of the upper electrode, and the first fixing plate The angle between the end and the upper electrode head is 45-135°, the second fixed plate head is fixed to the low-voltage end of the ground wire insulator string through the second fastener, and the end of the second fixed plate is connected to the lower electrode head. The end of the second fixing plate is perpendicular to the tip of the lower electrode, and the lower electrode is bent upwards from the middle, with an angle of 130-140°, and a small tip is added at the gap to increase the unevenness of the electric field in the gap There is a gap between the connection between the first fixed plate and the upper electrode and the bend of the lower electrode, and a tip is installed at the gap. The upper electrode is made of flat iron, and the lower electrode is made of round steel.