Relay protection configuration integrated equipment for power-plant electric auxiliary system

Abstract

The invention relates to the technical field of relay protection, and discloses relay protection configuration integrated equipment for a power-plant electric auxiliary system. The equipment comprises a high-voltage plant transformer relay protection device which is disposed at a high-voltage side and / or low-voltage side of a high-voltage plant transformer of the power-plant electric auxiliary system; and a low-voltage plant transformer relay protection device which is disposed at a high-voltage side or low-voltage side of a low-voltage plant transformer of the power-plant electric auxiliary system. The high-voltage plant transformer relay protection device comprises a high-voltage branch time-limiting quick-break protection apparatus which is disposed on a low-voltage side branch of the high-voltage plant transformer and used for the main protection of a bus segment corresponding to the low-voltage side of the high-voltage plant transformer. When the value of a current flowing through the high-voltage branch time-limiting quick-break protection apparatus is not less than an action current, a fault on a low-voltage side bus of the high-voltage plant transformer is eliminated. The equipment provided by the invention can quickly eliminate the fault at a corresponding position of the power-plant electric auxiliary system.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a complete set of device for relay protection configuration of a power system of a power plant. Background technique [0002] Various related regulations and specifications of relay protection (such as GB / T14285, DL / T5153, etc.) stipulate the basic principles of relay protection configuration of power plant power equipment. For a long time, the relay protection of plant power system is Carry out protection configuration design and setting calculation on the basis of adhering to these basic principles. Taking a 600MW unit as an example, the design scheme of the typical configuration of relay protection for utility power is shown in Table 1 and figure 1 Shown (wherein, the arrow indicates the scope of protection): [0003] Table 1 Typical configuration of relay protection for 600MW generating set plant power system [0004] [0005] However, for a long time, there ha...

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Problems solved by technology

[0007] The action time of the high-voltage overcurrent protection device Gg has reached 2.5s, which loses its protection significance for serious faults, which will cause serious damage to the equipment and expansion of the situation, and cannot meet the requirements of "rapidity and reliability" of relay protection.

[0008] (2) There is no main protection for the 6KV factory busbar: According to the regulations, the 6KV factory busbar of the power plant does not have a dedicated busbar protection, and the protection of the 6KV busbar is realized by the backup protection of the high-voltage factory transformer

[0010] (4) The main protection of the low-voltage industrial transformer has a dead zone: the main protection of the low-voltage industrial transformer is generally a current quick-break protection. Such a setting principle makes a small part of the low-voltage side body of the low-voltage industrial transformer and the contact wire before the low-voltage side outlet to the 400V bus incoming switch become the main protection dead zone. When a fault occurs in this section, only The fault can be cut off by the low-voltage overcurrent protection device Dg, and the time is usually relatively long (1.5s), which is likely to cause accident expansion and equipment damage

[0011] The above defects lead to the failure of the corresponding relay protection device to quickly remove the fault when a serious fault occurs in the power system of the plant, resulting in serious burnout of electrical equipment and huge losses

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