CN103606888A - Reactive power compensation equipment circuit protecting method and device - Google Patents

Abstract

The invention provides a reactive equipment circuit protection method and device. The method includes collecting the fault current of the reactive branch circuit, and judging whether the fault current is greater than the preset current blocking lock value, and if it is greater than the preset current blocking value If it is less than the preset current locking value, then the load switch of the reactive branch circuit will be tripped. In this method, by setting the preset current locking value, according to the size of the reactive branch circuit fault current, it is determined whether the protection action outlet acts on the load switch or the main circuit breaker of the main circuit, so that the reactive power protection device can realize selective tripping. Effectively reduces the range of fault removal.

Description

Reactive equipment circuit protection method and device

technical field

The invention relates to the electrical field, in particular to a method and device for protecting a reactive equipment circuit.

Background technique

The switching of 110kV reactive equipment circuits is frequent, so load switches are installed in the 110kV reactive branch circuits, and ceramic column circuit breakers are installed in the main circuit. work, use the circuit breaker of the main circuit to cut off the fault current.

In order to protect the 110KV circuit and prevent the fault current from causing damage to the circuit, as shown in Figure 1, a reactive power protection device is set in the 110KV reactive power equipment. The fault current of each branch circuit has both a short-circuit current as high as tens of kA and a small current of only tens of A. The existing reactive power protection device does not distinguish the magnitude of the fault current, and only sets one action outlet, that is, when a fault occurs Trip the main circuit breaker when there is current. This non-selective tripping method undoubtedly expands the scope of fault removal.

Therefore, there is a need for a protection method for reactive power equipment circuits, which can realize selective tripping of reactive power protection devices and reduce the scope of fault removal.

Contents of the invention

The invention provides a reactive power equipment circuit protection method and device. The method can enable the reactive power protection device to realize selective tripping and effectively reduce the scope of fault removal.

In order to achieve the above object, the present invention adopts the following technical means:

A reactive equipment circuit protection method, comprising:

Collect the fault current of the reactive branch circuit;

judging whether the fault current is greater than a preset current locking value;

If it is greater than the preset current locking lock value, trip the main circuit breaker;

If it is less than the preset current locking value, the load switch of the reactive branch circuit is tripped.

Preferably, when tripping the main circuit breaker, it also includes:

Start the failure of the main transformer branch circuit breaker and decompression lockout.

Preferably, when jumping off the load switch of the reactive branch circuit, it also includes:

Start the branch bus failure protection and release the complex pressure lockout.

A reactive equipment circuit protection device, comprising:

The collection unit is used to collect the fault current of the reactive branch circuit;

A judging unit, configured to judge whether the fault current is greater than a preset current blocking lock value;

The first processing unit is configured to trip the main circuit breaker if it is greater than the preset current blocking lock value;

The second processing unit is configured to jump off the load switch of the reactive branch circuit if it is less than the preset current blocking lock value.

The invention provides a reactive device circuit protection method, which includes collecting the fault current of the reactive branch circuit, and judging whether the fault current is greater than the preset current locking value, and if it is greater than the preset current locking value , the main circuit breaker is tripped, and if it is less than the preset current locking value, the load switch of the reactive branch circuit is tripped.

In this method, by setting the preset current locking value, according to the size of the reactive branch circuit fault current, it is determined whether the protection action outlet acts on the load switch or the main circuit breaker of the main circuit, so that the reactive power protection device can realize selective tripping, Effectively reduces the range of fault removal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Figure 1 is a schematic structural diagram of the 110kV reactive equipment circuit;

Fig. 2 is a flow chart of the reactive equipment loop protection method disclosed by the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a reactive device circuit protection device disclosed in an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 2, the present invention provides a reactive equipment circuit protection method, including:

Step S101: collecting the fault current of the reactive branch circuit;

Step S102: judging whether the fault current is greater than the preset current locking value, if greater, enter step S103, and if less, enter step S104;

Step S103: If it is greater than the preset current locking lock value, trip the main circuit breaker;

Step S104: If it is less than the preset current locking value, trip the load switch of the reactive branch circuit.

While tripping the circuit breaker of the main circuit, it also includes: starting the failure of the branch circuit breaker of the main transformer and decompressing and blocking.

When jumping off the load switch of the reactive branch circuit, it also includes: starting the branch bus failure protection and releasing the recovery lockout.

The above content is described in detail below:

When the reactive branch circuit fails, the reactive device collects the fault current of the reactive branch circuit, and compares the preset current locking value stored in the fault current itself. If the fault current is greater than the preset current locking value, It means that the fault current is too large. Since the load switch cannot cut off the large current, in order to protect the reactive branch circuit, the reactive device will act on the circuit breaker of the main circuit at the outlet, and start the failure and decompression of the branch circuit breaker of the main transformer. atresia.

If the fault current is less than the preset current locking value, it means that the fault current is very small. In order not to expand the influence range of the fault current, the reactive device will act on the load switch of the reactive branch circuit at the outlet, and at the same time start the branch bus failure Protection and release of complex pressure lockout.

In the reactive equipment circuit protection method provided by the present invention, by setting the preset current locking value and according to the magnitude of the fault current of the reactive branch circuit, it is determined whether the protection action outlet acts on the load switch or the main circuit breaker of the main circuit, so that The reactive power protection device realizes selective tripping, which effectively reduces the scope of fault removal.

As shown in Figure 3, the present invention also provides a reactive device circuit protection device, including:

The collection unit 100 is used to collect the fault current of the reactive branch circuit;

A judging unit 200, configured to judge whether the fault current is greater than a preset current blocking lock value;

The first processing unit 300 is configured to trip the main circuit breaker if it is greater than the preset current blocking lock value;

The second processing unit 400 is configured to trip the load switch of the reactive branch circuit if it is less than the preset current blocking lock value.

The reactive equipment circuit protection device provided by the present invention determines whether the protective action outlet acts on the load switch or the main circuit breaker of the main circuit according to the magnitude of the fault current of the reactive branch circuit by setting the preset current locking value, so that The reactive power protection device realizes selective tripping, which effectively reduces the scope of fault removal.

If the functions described in the method of this embodiment are implemented in the form of software function units and sold or used as independent products, they can be stored in a computing device-readable storage medium. Based on this understanding, the part of the embodiment of the present invention that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, the software product is stored in a storage medium, and includes several instructions to make a A computing device (which may be a personal computer, a server, a mobile computing device or a network device, etc.) executes all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A reactive equipment circuit protection method, characterized in that, comprising: Collect the fault current of the reactive branch circuit; judging whether the fault current is greater than a preset current locking value; If it is greater than the preset current locking lock value, trip the main circuit breaker; If it is less than the preset current locking value, the load switch of the reactive branch circuit is tripped. 2. The method according to claim 1, further comprising: Start the failure of the main transformer branch circuit breaker and decompression lockout. 3. method as claimed in claim 1, is characterized in that, when jumping off the load switch of described reactive power branch circuit, also comprises: Start the branch bus failure protection and release the complex pressure lockout. 4. A reactive equipment circuit protection device, characterized in that it comprises: The collection unit is used to collect the fault current of the reactive branch circuit; A judging unit, configured to judge whether the fault current is greater than a preset current blocking lock value; The first processing unit is configured to trip the main circuit breaker if it is greater than the preset current blocking lock value; The second processing unit is configured to jump off the load switch of the reactive branch circuit if it is less than the preset current blocking lock value.

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