Fully-adaptive skip-level-protection-preventing method suitable for complex power distribution network

An anti-overstepping and distribution network technology, applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve the effect of simple construction, high real-time performance, and convenient maintenance

Active Publication Date: 2019-03-01
NANJING INTELLIGENT APP
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Problems solved by technology

[0003] Aiming at the special requirements of the multi-level complex power supply system such as the distribution network of industrial and mining enterprises on the anti-overstepping protection system, the present invention proposes the following fully adaptive anti-overstepping protection method suitable for complex distribution networks

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  • Fully-adaptive skip-level-protection-preventing method suitable for complex power distribution network
  • Fully-adaptive skip-level-protection-preventing method suitable for complex power distribution network

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Embodiment Construction

[0009] The technical solutions of the present invention will be further described below through specific examples.

[0010] Such as figure 1 As shown, it is a system configuration block diagram of the fully adaptive anti-overstepping protection method applicable to complex distribution networks of the present invention.

[0011] There are two substations A and B, and the two busbars I and II of each substation run in parallel. The two busbars of substation A are connected to power sources P1 and P2 respectively, and the two busbars of substation B are connected to power sources P3 and P4 respectively. The I mother and II mother of the two substations are respectively connected by two lines. This is a complex multi-source distribution network.

[0012] For secondary equipment, an anti-override protection device is equipped at each switch (incoming line switch, outgoing line switch, section switch). A switch is configured in substations A and B respectively, and the two swit...

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Abstract

The invention discloses a fully-adaptive skip-level-protection-preventing method suitable for a complex power distribution network. The method mainly comprises a skip-level-protection-preventing device, a switch, a communication cable and an optical cable. The skip-level-protection-preventing device is connected to a main communication network through the switch, and has an inter-phase fault detection function and a small-current grounding fault detection function of over-flow-rate disconnection. The skip-level-protection-preventing device automatically identifies the hierarchical position ofitself in a power distribution network system through GOOSE message containing locking information sent by a subordinate protection device. When the power distribution network breaks down, the skip-level-protection-preventing device judges the faults and combines the received GOOSE locking information to carry out fault tripping, fault locking or delay tripping, and meanwhile, according to the fault direction and the received locking information, sends a locking signal to an upper-stage protection device in the positive direction or the reverse direction, so that an skip-level-protection-preventing function of the whole power distribution network is achieved, correct selection and tripping isolation faults of faults are ensured, and safe and stable operation of the power grid is achieved.

Description

technical field [0001] The invention belongs to the field of electric power automatic control. Aiming at problems such as multi-level complex power supply systems such as urban distribution networks, especially industrial and mining enterprise distribution networks, which are prone to loss of selectivity and lead to over-level tripping when the power grid fails, the powerful processing function of the intelligent anti-over-level protection device is used to realize it through the GOOSE fast communication mechanism. The transmission of fault information simplifies the difficulty of construction and realizes the perfect anti-skid protection scheme of the distribution network. Background technique [0002] Multi-level complex power supply systems such as urban distribution networks, especially industrial and mining enterprise distribution networks, have the characteristics of short power supply distance, high power supply density, and small protection intervals. Incoming line ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28
CPCH02H7/261H02H7/28
Inventor 张杭万尚军
Owner NANJING INTELLIGENT APP
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