CN109921380A

CN109921380A - A protection device for preventing reverse charging of heavy-action parallel devices

Info

Publication number: CN109921380A
Application number: CN201910106622.5A
Authority: CN
Inventors: 刘斌; 柳良勇; 胡宇卿; 翁小鹏; 林奇瑜; 陈佳红; 何蓉; 洪亮; 赖泓霏; 陈浩; 李朱峰; 田振宇; 姚迪; 张飞; 徐光煜
Original assignee: State Grid Corp of China SGCC; Lishui Power Supply Co of State Grid Zhejiang Electric Power Co Ltd; Jingning Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Lishui Power Supply Co of State Grid Zhejiang Electric Power Co Ltd; Jingning Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2019-02-02
Filing date: 2019-02-02
Publication date: 2019-06-21
Anticipated expiration: 2039-02-02
Also published as: CN109921380B

Abstract

The invention discloses a protection device for preventing reverse charging of a heavy-action parallel device, comprising a transformer, a rectifier and a relay. The executive end of the relay is connected to the segmented busbar and the re-acting parallel device. The invention can prevent the reverse charging of the heavy-acting parallel device during operation after the failure of the segmented bus, effectively protect the power network and equipment, and improve the safety and reliability.

Description

A kind of protective device for preventing from moving parallel device reverse charge again

Technical field

The present invention relates to a kind of power equipment, in particular to a kind of protection dress for preventing from moving parallel device reverse charge again It sets.

Background technique

During the actual operation of substation, after a buckling breaks down on sectionalized busbar, need to arrive first substation Scene is out of service by failure buckling, then simultaneously column voltage moves parallel device again, and the secondary voltage of normal buckling is introduced into failure Buckling secondary side, the secondary voltage of sectionalized busbar where making failure buckling restore normal.If failure buckling is straight not out of service It connects and column voltage moves parallel device again, the secondary voltage meeting reverse charge of normal buckling causes failure pressure to failure buckling primary side Become fault spread, and impact is generated to normal buckling.Therefore a kind of protective device that can prevent reverse charge is needed, is mentioned with this The safety and reliability of high power equipment.

The utility model of publication number CN204089166U discloses a kind of intelligence PT voltage and moves parallel device again, includes Dsp processor；It is connected to the communication interface modules of dsp processor；It is connected to the human-machine interface module of dsp processor；It is connected at DSP Manage the first, second voltage sample module of device；It is connected to the switching input module of dsp processor；The dsp processor connection is patrolled Control module is collected, there is the output logic control circuit for being connected to dsp processor, the output logic control circuit is connected to survey Measure that voltage moves again and relay module, protection voltage move again side by side and relay module and metered voltage are moved and side by side again side by side Relay module.The device is used to acquire the voltage of two sections of sectionalized busbar PT, there are two sections of PT voltages to move again, two sections of PT voltages are simultaneously Column function, applied to 110KV and the PT voltage of following voltage class moves again and voltage field arranged side by side.

Voltage in above-mentioned documents moves parallel device again, and structure is complicated, and higher cost, safety and reliability are lower.

Summary of the invention

For prior art construction complexity, higher cost, safety and the lower problem of reliability, the invention discloses one Protective device of the kind for preventing from moving parallel device reverse charge again, can prevent from moving and equipping again in sectionalized busbar voltage failure It sets and the case where reverse charge occurs, effectively improve the safety and reliability of power equipment and network.

It is technical solution of the present invention below.

A kind of protective device for preventing from moving parallel device reverse charge again, including transformer, rectifier and relay, institute State transformer connection segment bus, the rectifier connects transformer, and the control terminal of the relay connects rectifier, it is described after The actuating station connection segment bus of electric appliance and again dynamic parallel device.The friendship of a low-voltage is drawn from sectionalized busbar by transformer Galvanic electricity, then low-voltage AC electricity is converted to by direct current by rectifier, direct current controls relay, when sectionalized busbar voltage goes out When existing failure, the alternating current of transformer output and the direct current of rectifier output can be varied widely, and cause relay There is the case where reverse charge after preventing it from starting, mentions to cut off sectionalized busbar and move the connection of parallel device again in switch change High safety.

Preferably, the relay includes electromagnet, armature and fixture, the electromagnet connects rectifier, the rank Iron is detachably connected with fixture, and armature is electrically connected with sectionalized busbar, and the fixture is electrically connected with dynamic parallel device again.In electromagnet When normal work, armature uniform force is clamped, circuit conducting, when the curent change that electromagnet is subject to, armature stress It is unbalance, skid off fixture, circuitry cuts.

Preferably, the armature includes bull stick and the contact that bull stick one end is arranged in, the bull stick is close to electromagnet one Side is equipped with spring, and the spring is compressive state when armature and fixture closure are connected, the contact connection segment bus, contact with Fixture is detachably connected.Armature in normal work, by the elastic force of spring and the gravitation of opposite direction electromagnet, two kinds of power Numerical values recited gap is smaller, relatively stable when being clamped, and will not slide.When electromagnet gravitation increases, gravitation is significantly greater than When elastic force, armature is drawn close toward electromagnet direction, skids off fixture, and cutting executes terminal circuit；When electromagnet gravitation reduces, gravitation is obvious When less than elastic force, armature is slided toward far from electromagnet direction, is cut off the power.As long as therefore the voltage of sectionalized busbar breaks down, The connection of armature and fixture just will disconnect.

Preferably, the fixture includes symmetrically arranged a pair of of clamping bar and contact chip, the one of the contact chip and clamping bar End is rotatably connected, and contact chip is abutted with the contact, and the other end of the clamping bar is fixed, and spring is equipped among two clamping bars, The spring works have foot with the contact area of contact, guarantee for increasing in tensional state, contact chip in normal work Enough contacts, when contact skids off, rotatable contact chip reduces resistance suffered by contact, improves reliability.

Preferably, the contact is triangle, contact is inclined-plane with the contact chip place of abutting.It here is the fortune based on contact Designed by dynamic rail mark.

Preferably, further including duplicate relay, the control terminal of the duplicate relay connects rectifier, duplicate relay Actuating station connect with the actuating station of above-mentioned main relay.To prevent main relay from breaking down, duplicate relay can be effective Improve reliability.

Preferably, the outside of the contact chip and clamping bar is equipped with insulating layer.After armature and fixture disconnect, non- It in the case where active operation, will not voluntarily connect again, prevent danger occur in maintenance, improve safety.

The invention has the benefit that prevent from moving parallel device there is reverse charge at work again, protect electric power networks and Equipment improves safety and reliability.

Detailed description of the invention

Fig. 1 is the embodiment of the present invention schematic diagram；

Fig. 2 is the embodiment of the present invention partial enlarged view；

Fig. 3 is connection figure of the embodiment of the present invention in power grid；

In figure: 1- transformer, 2- rectifier, 3- armature, 4- fixture, 5- electromagnet, 6- contact chip.

Specific embodiment

The technical program is further elaborated below in conjunction with Figure of description.

Embodiment: being as shown in Figure 1 a kind of protective device for preventing from moving parallel device reverse charge again, including transformer 1, rectifier 2 and relay, the 1 connection segment bus of transformer, the rectifier 2 connect transformer 1, the relay Control terminal connects rectifier 2, the actuating station connection segment bus of the relay and again dynamic parallel device.By transformer 1 from Sectionalized busbar draws the alternating current of a low-voltage, then low-voltage AC electricity is converted to direct current, direct current by rectifier 2 Relay is controlled, when sectionalized busbar voltage breaks down, the direct current for alternating current and rectifier 2 output that transformer 1 exports It can vary widely, cause the switch change of relay, to cut off sectionalized busbar and move the connection of parallel device again, prevent Only there is the case where reverse charge after its starting, improves safety.

In the present embodiment, the relay includes electromagnet 5, armature 3 and fixture 4, and the electromagnet 5 connects rectifier 2, The armature 3 is detachably connected with fixture 4, and armature 3 is electrically connected with sectionalized busbar, and the fixture 4 is electrically connected with dynamic parallel device again It connects.When electromagnet 5 works normally, 3 uniform force of armature is clamped by fixture 4, circuit conducting, when the electric current that electromagnet 5 is subject to When variation, 3 stress of armature is unbalance, skids off fixture 4, circuitry cuts.

As shown in Fig. 2, the armature 3 includes bull stick and the contact that bull stick one end is arranged in, the bull stick is close to electromagnet 5 It is compressive state, the contact connection segment bus, touching that side, which is equipped with spring when spring, armature 3 and the closure conducting of fixture 4, Head is detachably connected with fixture 4.Armature 3 in normal work, by the elastic force of spring and the gravitation of opposite direction electromagnet 5, The numerical values recited gap of two kinds of power is smaller, relatively stable when being clamped by fixture 4, will not slide.When the increase of 5 gravitation of electromagnet, draw When power is significantly greater than elastic force, armature 3 is drawn close toward 5 direction of electromagnet, skids off fixture 4, and cutting executes terminal circuit；When electromagnet 5 draws Power reduces, and when gravitation is significantly less than elastic force, armature 3 is slided toward far from 5 direction of electromagnet, cuts off the power.As long as being therefore segmented female The voltage of line breaks down, and armature 3 and the connection of fixture 4 just will disconnect.

In the present embodiment, the fixture 4 includes symmetrically arranged a pair of of clamping bar and contact chip 6, the contact chip 6 and clamping bar One end be rotatably connected, contact chip 6 is abutted with the contact, and the other end of the clamping bar is fixed, and is equipped among two clamping bars Spring, the spring works are in tensional state, and contact chip 6 is used to increase and the contact area of contact, guarantee in normal work With enough contacts, when contact skids off, rotatable contact chip 6 reduces resistance suffered by contact, improves reliability.

In the present embodiment, the contact is triangle, and contact is inclined-plane with 6 place of abutting of contact chip.It here is based on contact Motion profile designed by.

Further include duplicate relay in the present embodiment, the control terminal of the duplicate relay connects rectifier 2, it is spare after The actuating station of electric appliance is connected with the actuating station of above-mentioned main relay.To prevent main relay from breaking down, duplicate relay can It improves reliability effectively.

In the present embodiment, the outside of the contact chip and clamping bar is equipped with insulating layer.After armature and fixture disconnect, It in the case where non-active operation, will not voluntarily connect again, prevent danger occur in maintenance, improve safety.

For ease of understanding, the connection figure of embodiment is provided, as shown in figure 3, the series relay at I section of bus 1-1QD7 (1-CDJ) and relay (2-CDJ), series relay (3-CDJ) and relay (4-CDJ) at II section of bus 1-1QD9.When I section After bus voltage transformer PT1 breaks down, relay 1-CDJ(or 2-CDJ) movement is executed, disconnect normally-closed contact, to make route It disconnects, II section of bus is similarly.

The present embodiment has the beneficial effect that prevent from moving parallel device again reverse charge occurs at work, protects electric power networks And equipment, improve safety and reliability.

It should be noted that the specific embodiment is only used for that technical solution is further described, it is not used in and limits the skill The range of art scheme, any modifications, equivalent substitutions and improvements etc. based on this technical solution are regarded as in protection of the invention In range.

Claims

1. A protection device for preventing reverse charging of a heavy-action parallel device, characterized in that it comprises a transformer, a rectifier and a relay, the transformer is connected to a segmented bus, the rectifier is connected to a transformer, and the control end of the relay is connected to the rectifier , the execution end of the relay is connected to the segmented busbar and the heavy-acting parallel device.

2 . The protection device for preventing reverse charging of a heavy-action parallel device according to claim 1 , wherein the relay comprises an electromagnet, an armature and a clamp, the electromagnet is connected to a rectifier, and the armature is connected to a rectifier. 3 . The clamp is detachably connected, the armature is electrically connected with the segmented busbar, and the clamp is electrically connected with the weighted parallel device.

3 . The protection device for preventing reverse charging of heavy-action parallel devices according to claim 2 , wherein the armature comprises a rotating rod and a contact arranged at one end of the rotating rod, and the rotating rod is close to the electromagnetic field. 4 . A spring is provided on one side of the iron, the spring is in a compressed state when the armature and the clamp are closed and connected, the contact is connected to the segmented bus, and the contact and the clamp are detachably connected.

4 . The protection device for preventing reverse charging of a heavy-acting parallel device according to claim 3 , wherein the clamp comprises a pair of clamping rods and contact pieces arranged symmetrically, and the contact pieces and the clamping rods are symmetric. 5 . One end of the clamp is rotatably connected, the contact piece is in contact with the contact, the other end of the clamp rod is fixed, a spring is arranged between the two clamp rods, and the spring works in a stretched state.

5 . The protection device for preventing reverse charging of a heavy-action parallel device according to claim 4 , wherein the contact is triangular, and the abutment between the contact and the contact piece is an inclined plane. 6 .

6 . The protection device for preventing reverse charging of a heavy-acting parallel device according to claim 1 , further comprising a backup relay, the control end of the backup relay is connected to the rectifier, and the executive end of the backup relay is connected to the above-mentioned rectifier. 7 . The executive terminals of the main relay are connected in series.

7 . The protection device for preventing reverse charging of a heavy-action parallel device according to claim 4 or 5 , wherein an insulating layer is provided on the outer sides of the contact piece and the clamping rod. 8 .