CN102522280A - Operation method for 10kV drop-out fuse - Google Patents

Abstract

The invention relates to an operation method for a 10kV drop-out fuse; the technical scheme of the invention comprises the following steps: during the operation of switching out, firstly, switching out an intermediate phase, then, switching out a leeward edge phase, and finally, switching out a windward edge phase so as to change a three-phase operation of a distribution transformer into a two-phase operation; due to the smallest arc sparks during switching out of the intermediate phase, an interphase short circuit cannot be caused; during switching on, ensuring that the operating sequence is inversed with the operating sequence of switching out, i.e., firstly, switching on the windward edge phase, then switching on the leeward edge phase, and finally switching on the intermediate phase; and when a fusion tube is operated, moderately exerting force when the fusion tube is switched out and switched on so as to ensure that a duckbilled tongue can be tightly buckled with more than 2/3 that of the length of the tongue. The operation method for the 10kV drop-out fuse has the beneficial effects that not only the workload of maintenance personnel is reduced, but also the cases of completely losing a protective function of a drop-out fuse, enlarging the range of power failure when a short circuit happens in a line, and then bypassing a 10kV outgoing line of a substation to cause tripping of a main circuit breaker to cause power failure of the whole line due to the inappropriate operation of maintenance personnel are avoided.

Description

The operation method of 10kV fuse switch

Technical field:

The present invention relates to a kind of use of fuse switch, particularly a kind of operation method of 10kV fuse switch.

Background technology:

Fuse switch is the most frequently used a kind of protective switch of the short circuit of 10kV distribution line branch line and distribution transformer; It has economy, easy to operate, adapt to characteristics such as outdoor environment property is strong, be widely used in 10kV distribution line and distribution transformer primary side as protection with carry out the equipment throwing, cut the usefulness of operation.It is installed on the 10kV distribution line branch line, can dwindle the power failure scope, because of it has a tangible cut-off point, has possessed the function of isolating switch, has created a safety work environment for maintenance section circuit and equipment, has increased maintainer's the sense of security.Be installed on the distribution transformer, can be used as the main protection of distribution transformer, so, in 10kV distribution line and distribution transformer, obtained popularizing.Its operation principle is: the moving contact at cartridge fuse two ends relies on fuse (melt) to fasten, and after will going up moving contact and pushing " duckbilled " projection, the upper static contact that phosphorus bronze sheet etc. are processed heads on moving contact, so cartridge fuse is stuck in " duckbilled " lining securely.When short circuit current passes through fuse failure, produce electric arc, the vulcanized fiber tube of cartridge fuse liner produces a large amount of gas and is shut because of the cartridge fuse upper end under arcing, and gas sprays to the lower end, blows out electric arc.Because fuse failure, the last lower moving contact of cartridge fuse loses the power of fastening of fuse, and under the effect of cartridge fuse self gravitation and upper and lower fixed contact spring leaf, cartridge fuse falls rapidly, circuit is broken off, excision faulty section circuit or faulty equipment.The problem that exists in the existing rural power grids has not only increased the work of maintenance personnel amount; And impel attendant (especially rural power worker's) improper use; Fully lose the due defencive function of fuse switch; Be short-circuited in the line and can only the power failure expanded range be bypassed the immediate leadership to the tripping operation of the 10kV of electric substation outlet main breaker, causing completely, the road has a power failure.

Summary of the invention:

The object of the invention is exactly the above-mentioned defective that exists to prior art, and a kind of operation method of 10kV fuse switch is provided.

Its technical scheme is: be made up of following steps:

Undertaken by two people when (1) operating, people monitoring, insulating gloves is worn in one man operation, wears insulation boots, wears spectacles, the qualified insulating rod operation that the working voltage grade is complementary, quiescing under the weather of thunder and lightning or heavy rain;

(2) when operating a switch operation, phase in the middle of breaking is earlier drawn leeward limit phase again, breaks the limit phase of facining the wind at last, makes distribution transformer change two-phase operation into by three-phase operation, and the arc spark that phase time is produced in the middle of breaking is minimum, the unlikely phase fault that causes; Next is to break leeward limit phase, because middle phase is drawn back, leeward limit has increased by one times with windward side distance mutually, even there is overvoltage to produce, causes the possibility of phase fault also very little; Break the windward side phase time at last, capacitance current is over the ground only arranged, the electric spark of generation is then very slight;

Opposite when operating sequence is operated a switch when (3) closing a floodgate, close the windward side phase earlier, close leeward limit phase again, phase in the middle of closing at last;

(4) operation is during fusion tube, draws, the appropriateness of will exerting oneself when closing fusion tube, makes the duckbilled tongue can tightly fasten tongue length more than 2/3rds; It is several following to pressing down to hook duckbilled through brake pull-rod; Again gently the examination draw, the inspection whether get togather, fail during combined floodgate to put in place or do not close firm; Fuse upper static contact insufficient pressure very easily causes contact burn or fusion tube to fall voluntarily.

The invention has the beneficial effects as follows: not only reduced the work of maintenance personnel amount; And impel attendant (especially rural power worker's) improper use; Fully lose the due defencive function of fuse switch; Be short-circuited in the line and can only the power failure expanded range be bypassed the immediate leadership to the tripping operation of the 10kV of electric substation outlet main breaker, causing completely, the road has a power failure.

Embodiment:

Method of operation of the present invention is made up of following steps:

Undertaken by two people when (1) operating, people monitoring, insulating gloves is worn in one man operation, wears insulation boots, wears spectacles, the qualified insulating rod operation that the working voltage grade is complementary, quiescing under the weather of thunder and lightning or heavy rain;

(2) when operating a switch operation, phase in the middle of breaking is earlier drawn leeward limit phase again, breaks the limit phase of facining the wind at last, makes distribution transformer change two-phase operation into by three-phase operation, and the arc spark that phase time is produced in the middle of breaking is minimum, the unlikely phase fault that causes; Next is to break leeward limit phase, because middle phase is drawn back, leeward limit has increased by one times with windward side distance mutually, even there is overvoltage to produce, causes the possibility of phase fault also very little; Break the windward side phase time at last, capacitance current is over the ground only arranged, the electric spark of generation is then very slight;

Opposite when operating sequence is operated a switch when (3) closing a floodgate, close the windward side phase earlier, close leeward limit phase again, phase in the middle of closing at last;

(4) operation is during fusion tube, draws, the appropriateness of will exerting oneself when closing fusion tube, makes the duckbilled tongue can tightly fasten tongue length more than 2/3rds; It is several following to pressing down to hook duckbilled through brake pull-rod; Again gently the examination draw, the inspection whether get togather, fail during combined floodgate to put in place or do not close firm; Fuse upper static contact insufficient pressure very easily causes contact burn or fusion tube to fall voluntarily.

In addition, Maintenance management method is following:

(1) for making the operation that fuse can be more reliable, safe, remove the qualified products of selecting regular manufacturer production by rules and the accessory (comprise and melt part etc.) strictly, in operation maintenance management, should be specifically noted that following item:

It is suitable whether utensil rated current and melt and the load current value of 1. fusing matees, if mismate must be adjusted.

2. each operation of fuse must be careful conscientious, can not be careless, and particularly closing operation must make dynamic and static contact contact good.

3. must use standard melt in the fusion tube, forbid replacing melt, more ban the use of copper wire, aluminium wire and iron wire the contact colligation is lived to use with the copper wire aluminium wire.

4. to the fuse of new installation or replacing, the strict operation of checking and accepting, must satisfy the rules quality requirement, the fusion tube setting angle reaches the inferior horn that inclines about 25 °.

The same specification melt that 5. should more renew after the melt fusing can not connect the melt after the fusing and reinstalls fusion tube and continue to use.

6. should regularly make an inspection tour, be no less than night inspection one time in every month, check to have or not discharge spark and poor contact phenomenon that discharge is arranged, can will arrange as early as possible to handle with the sound of neighing to fuse.

(2) when spring inspection interruption maintenance, tackle the inspection that fuse is done following content:

Whether 1. quiet, moving contact contact coincide, closely intact, and the vestige of not burning is arranged.

2. whether the fuse rotary part is flexible, not corrosion arranged, rotate ineffective etc. unusually, and whether parts damage, spring has not corrosion.

3. melt itself does not have and sustains damage, and after long-term energising, having or not the heating elongation too much to become lax unable.

4. fusion tube aerogenesis in action pipe repeatedly whether burn with expulsion tube and expose to the sun and rain after whether damage deformation, length shorten.

5. clean insulator and inspection has not damaged, crackle or spark tracking, take upper and lower lead-in wire apart after, testing insulation resistance with the 2500V megger should be greater than 300M Ω.

6. check that fuse connects lead-in wire up and down non-loosening, discharge, superheating phenomenon are arranged.

Defective to above-mentioned item inspection goes out must conscientiously be overhauled processing.

Claims (1)

1. the operation method of a 10kV fuse switch is characterized in that being made up of following steps:

Undertaken by two people when (1) operating, people monitoring, insulating gloves is worn in one man operation, wears insulation boots, wears spectacles, the qualified insulating rod operation that the working voltage grade is complementary, quiescing under the weather of thunder and lightning or heavy rain;

(2) when operating a switch operation, phase in the middle of breaking is earlier drawn leeward limit phase again, breaks the limit phase of facining the wind at last, makes distribution transformer change two-phase operation into by three-phase operation, and the arc spark that phase time is produced in the middle of breaking is minimum, the unlikely phase fault that causes; Next is to break leeward limit phase, because middle phase is drawn back, leeward limit has increased by one times with windward side distance mutually, even there is overvoltage to produce, causes the possibility of phase fault also very little; Break the windward side phase time at last, capacitance current is over the ground only arranged, the electric spark of generation is then very slight;

Opposite when operating sequence is operated a switch when (3) closing a floodgate, close the windward side phase earlier, close leeward limit phase again, phase in the middle of closing at last;

(4) operation is during fusion tube, draws, the appropriateness of will exerting oneself when closing fusion tube, makes the duckbilled tongue can tightly fasten tongue length more than 2/3rds; It is several following to pressing down to hook duckbilled through brake pull-rod; Again gently the examination draw, the inspection whether get togather, fail during combined floodgate to put in place or do not close firm; Fuse upper static contact insufficient pressure very easily causes contact burn or fusion tube to fall voluntarily.