CN210224954U

CN210224954U - Arc light protection device based on spark gap

Info

Publication number: CN210224954U
Application number: CN201921616579.9U
Authority: CN
Inventors: Feng Min; 闵锋; Ziqi Tan; 谭子琦
Original assignee: Wuhan Iron and Steel Group Echeng Iron and Steel Co Ltd
Current assignee: Baowu Group Echeng Iron and Steel Co Ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-03-31
Anticipated expiration: 2029-09-26

Abstract

The utility model relates to a cubical switchboard protective apparatus field, specifically a spark gap-based arc light protection device, including controller, spark gap and isolation switch, the isolation switch is connected with the electric wire netting, and the isolation switch is connected spark gap one end, and the other end of spark gap ground connection still includes fast switch, voltage transformer, fast switch with the spark gap is parallelly connected, voltage transformer one end ground connection, and the other end is connected the isolation switch, spark gap and fast switch are controlled by the controller; the utility model discloses shorten arc light overvoltage duration, for the time of operation personnel fully adjusted load and the time of maintainer fault diagnosis, avoided the loss that important load direct power-off brought.

Description

Arc light protection device based on spark gap

Technical Field

The utility model relates to a cubical switchboard protective apparatus field specifically is an arc light protection device based on spark gap.

Background

With the development of economy, the number of power utilization enterprises is increased rapidly, and the safety and protection requirements of power utilization are higher and higher. For the power supply of industrial area users, because the users are more, the arc short-circuit fault can be generated by the factors such as the equipment operation and equipment fault of a transmission line and each user, the safety of personnel is endangered, the damage of electric equipment is caused, the normal production of electric enterprises is influenced, and the great loss is brought to the electric enterprises. The existing arc extinction protection devices on the market can not effectively solve the problem of arc overvoltage, for example (the name of patent No. 201710203388: an arc extinction protection device based on a rapid vacuum switch and a protection method thereof) are used for detecting and rapidly protecting the arc fault of a power grid to realize rapid arc extinction, but the prior arc extinction protection devices also have the obvious defects: 1. the mechanical switch has relatively long action time and long duration of arc overvoltage, thus aggravating the burning loss of faults; 2. the voltage transformer is easy to burn; 3. no matter the nature and importance of the load, a tripping instruction is directly sent to the breaker, so that the accident influence and the power failure time can be enlarged; 4. the reliability of the arc light signal detection element is relatively poor, and blind areas possibly exist in distribution, so that the arc light cannot be accurately judged; 5. the service life of the arc light detection element is relatively low, and the replacement of the arc light detection device in the high-voltage switch cabinet needs the power failure treatment of the switch, so that the replacement is relatively difficult.

Disclosure of Invention

The utility model aims at solving the problem of the existing arc light protection device, and providing an arc light protection device based on a spark gap.

The utility model has the following concrete scheme: the utility model provides an arc light protection device based on spark gap, includes controller, spark gap and isolation switch, and isolation switch is connected with the electric wire netting, and isolation switch connects spark gap one end, and the spark gap other end ground connection still includes fast switch, voltage transformer, fast switch with spark gap is parallelly connected, and voltage transformer one end ground connection, the other end is connected isolation switch, spark gap and fast switch are controlled by the controller.

The utility model discloses still divide disconnected high-voltage fuse including the height, the high disconnected high-voltage fuse that divides with voltage transformer establishes ties, and the high disconnected high-voltage fuse one end of dividing is connected keep apart the switch, and the other end is connected voltage transformer.

Spark gap can be changed into silicon controlled rectifier SCR or insulated gate bipolar transistor IGBT.

The working principle of the utility model is as follows: the controller of the device detects the three-phase voltage of the power grid in real time through the voltage transformer, when the power grid has unstable intermittent arc grounding faults, the spark gap acts to instantly form metal grounding on a us-level fault phase, arc extinction and arc overvoltage limitation are simultaneously completed, meanwhile, the controller acts on the quick switch closure according to a set voltage setting value, the spark gap is in short circuit shutoff, the quick switch forms stable metal grounding on the fault phase, and the problem of electric energy quality such as arc overvoltage and the like caused by the arc grounding faults is effectively solved; after several seconds, the controller acts on the quick switch to be switched off, if the system is recovered to be normal (the detection voltage is normal, the spark gap does not act), the fault phenomenon disappears, the transient grounding fault caused by the overvoltage impact of the system is considered, if the spark gap acts again in the original fault phase, the controller judges that the fault is a permanent arc grounding fault, and then the controller acts on the quick switch to be switched on again to wait for the next processing of maintenance personnel.

Compared with the prior art, the utility model has the following advantage: 1. the spark GAP GAP and the quick switch are used in a matched manner, so that the arc extinguishing time is shorter, and the arc light overvoltage duration is shortened; 2. the voltage transformer is protected by adopting a high-breaking high-voltage fuse, and is not easy to burn; 3. the fault tolerance is better during arc grounding accidents, the accident range is effectively controlled, the time for operating personnel to fully adjust the load and the time for fault judgment of maintainers are given, and the loss caused by direct power failure of important loads is avoided; 4. the device has higher reliability, simple structure and easy maintenance.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

in the figure: 1-isolation disconnecting link, 2-spark gap, 3-fast switch, 4-high breaking high-voltage fuse and 5-voltage transformer.

Detailed Description

Example one

Referring to fig. 1, the arc light protection device based on the spark gap in this embodiment is used for a switch cabinet of a 10KV power grid, and includes a controller, a spark gap 2, an isolation switch 1, where the isolation switch 1 is connected to the power grid, the isolation switch 1 is connected to one end of the spark gap 2, the other end of the spark gap 2 is grounded, the arc light protection device further includes a fast switch 3 and a voltage transformer 5, the fast switch 3 is connected in parallel with the spark gap 2, one end of the voltage transformer 5 is grounded, the other end is connected to the isolation switch 1, the spark gap 2 and the fast switch 3 are controlled by the controller, the fast switch 3 in this embodiment is a 630-25 type fast switch produced by achai, kay, electric power technology limited company, the switching-on time is not more than 15ms, and the switching-off time is not more than 5 ms.

The arc light protection device further comprises a high-breaking high-voltage fuse 4, the high-breaking high-voltage fuse 4 is connected with the voltage transformer 5 in series, one end of the high-breaking high-voltage fuse 4 is connected with the isolation switch 1, and the other end of the high-breaking high-voltage fuse is connected with the voltage transformer 5.

Example two

The structure of the present embodiment is basically the same as that of the embodiment, except that the spark gap 2 is replaced by a thyristor SCR.

EXAMPLE III

The structure of the present embodiment is substantially the same as that of the embodiment, except that the spark gap 2 is replaced with an insulated gate bipolar transistor IGBT.

Claims

1. The utility model provides an arc light protection device based on spark gap, includes controller, spark gap and isolation switch, and isolation switch is connected with the electric wire netting, and isolation switch connects spark gap one end, and the spark gap other end ground connection, characterized by: the spark gap isolation switch is characterized by further comprising a quick switch and a voltage transformer, wherein the quick switch is connected with the spark gap in parallel, one end of the voltage transformer is grounded, the other end of the voltage transformer is connected with the isolation switch, and the spark gap and the quick switch are controlled by a controller.

2. The spark gap based arc protection device of claim 1, wherein: still include the high-tension fuse that divides absolutely, the high-tension fuse that divides absolutely with voltage transformer establishes ties, and the high-tension fuse that divides absolutely one end is connected keep apart the switch, and the other end is connected voltage transformer.

3. The spark gap based arc protection device of claim 1, wherein: the spark gap can be replaced by a silicon controlled SCR or an insulated gate bipolar transistor IGBT.