Fault locking method for relay protection in digital substation

A substation and fault technology, applied in the field of electricity, can solve problems such as misoperation and increased hardware costs, and achieve the effect of improving flexibility, improving reliability, and high reliability

CN102064613AInactive Publication Date: 2011-05-18XJ ELECTRIC +2
5 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-05-18
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a fault locking method for relay protection in a digital substation. In the relay protection, a plurality of IED (Intelligent Electronic Device) distributed fault detection elements are integrated with various fault identification criterions to effectively identify faults of a power system; a protection device and intelligent unit double-fault locking mechanism is adopted, wherein a process layer communication CPU (Central Processing Unit) on the protection device only releases GOOSE (Generic Object Oriented Substation Event) trip locking and forwards a GOOSE trip signal to an intelligent unit on the premise that a trip command for protecting the CPU and a fault detection FD open command exist simultaneously; and the intelligent unit only releases locking and trips on the premise that the GOOSE trip command and the FD open command are received simultaneously. On the basis of network information sharing, the fault locking method provided by the invention is integrated with various fault identification criterions to effectively identify the fault of the power system by adopting the plurality of the IED detection elements, and prevents false tripping caused by IED abnormality so as to improve the reliability of the power system.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of electricity, and relates to a blocking protection method of a relay protection fault detection element for preventing relay protection malfunction in a digital substation. Background technique

[0002] The reliability of relay protection devices in high-voltage transmission systems is the guarantee for the safe and stable operation of power systems. In conventional substations, in order to prevent the protection device from malfunctioning due to software and hardware failures, most relay protection devices use the method of driving the starting relay to open and protect the outlet circuit power supply, that is, to block the outlet circuit through hard contacts. The method prevents the protection from malfunctioning. The Chinese patent with the patent number ZL200310110260.6 discloses a relay protection fault detection module, and discloses a corresponding detection method for detecting system disturbances, but thi...

Examples

Embodiment Construction

[0016] The fault blocking method for relay protection in digital substations of the present invention is based on network information sharing, adopts distributed multi-protection device IED detection elements, and integrates multiple fault identification criteria to effectively identify power system fault maintenance. The dual fault blocking mechanism of the protection device and the intelligent unit, the process layer communication CPU on the protection device can only be activated when the trip command of the protection CPU and the FD (Fault Detect) open command are at the same time (referring to the time when the two commands appear or the time when they become valid) The interval time is within 100 ms, considering factors such as the correlation of power system faults and the transmission delay and failure retransmission mechanism of related commands in different network structures, the threshold of 100 ms may be adjusted in specific applications). On the premise of existen...