CN103094987A - Identification and isolation method of through faults of coal mine power supply system - Google Patents

Abstract

The invention provides an identification and isolation method of through faults of a coal mine power supply system, and belongs to a relay protection method of the coal mine power supply system. The steps of the method include that (1) sub intelligent substations are built in substations on the ground and underground, a station level with an area centralized control center is built on the ground to serve as a common station level of all the sub intelligent substations, and the common station level coordinates and controls the sub intelligent substations; (2) a host in the centralized control center collects and comprehensively judges fault information sent from protection and measurement and control modules of the sub intelligent substations to achieve identification and isolation of the faults, displays fault sections and fault types on a displayer and sends out fault alarms; and (3) the sub intelligent substations collect or samples system voltage and current data of each branch circuit, and calculate and judge the various fault types and abnormal operation states, and the sub intelligent substations send out trip orders to breakers at the fault sections to achieve isolation of the various types of faults. The method has the advantages of being easy to carry out, precise in judge and high in reliability.

Description

A method for identification and isolation of through faults in coal mine power supply system

technical field

The invention relates to a relay protection method for a coal mine power supply system, in particular to a method for identifying and isolating a through-fault of the coal mine power supply system.

Background technique

The same voltage level of the coal mine power grid has to pass through multiple substations. Due to the short power supply lines, large differences in operation modes, and excessive short-circuit current, the settings of the quick-break protection of switches at all levels cannot be distinguished. The protection time limit of the power system for the incoming power line of the coal mine power grid is not long, which makes it difficult to coordinate the setting of the upper and lower protections, resulting in multi-level crossing of single-phase leakage faults in the high-voltage power grid of the coal mine. The smart substation technology realizes the sharing of information in the whole station, and provides a new opportunity for completely solving the through-fault of the multi-stage series supply system of the coal mine power grid.

Contents of the invention

Technical problem: Aiming at the problems existing in the above-mentioned prior art, the present invention provides a coal mine power supply system through-fault identification and isolation method, which solves various through-fault faults in the coal mine power supply system, especially the non-selective problem of leapfrog tripping and leakage protection .

Technical solution: In order to achieve the above purpose, the technical solution adopted in the present invention is: a coal mine power supply system through fault identification and isolation method, that is, the regional centralized control center of the station control layer collects the information of each sub-smart substation for unified processing and comprehensively judges the fault segment and isolate, including the following steps:

(1) The ground and underground substations are respectively built as sub-smart substations, and a station control layer with a regional centralized control center is built on the ground as the public station control layer of each sub-smart substation. The public station control layer coordinates and controls each sub-smart substation ;

(2) The regional centralized control center has the function of fault identification and isolation. The regional centralized control center includes a centralized control center host and a display. The centralized control center host collects the fault information sent by the protection and measurement and control modules of each substation, and performs Comprehensive judgment to realize the identification and isolation of faults, display the analysis results on the background interface for topology coloring, display the fault section and fault type on the display, and issue a fault alarm;

(3) Each sub-smart substation collects or samples the system voltage and each branch current data, calculates and judges and identifies various fault types and abnormal operating states, and then proceeds to the following steps;

(4) The protection, measurement and control devices of each sub-smart substation organize GOOSE messages and send them to the host of the regional centralized control center according to the identified fault types and abnormal operation status;

(5) According to the fault type and abnormal operation status information uploaded by the protection, measurement and control devices of each sub-smart substation, the host computer of the centralized control center judges the section where the fault is located through the fault section positioning software, and sends a report to the sub-smart substation where the fault section is located. The protection measurement and control device of the substation sends the protection action "permit" signal, and sends the protection action "blocking" signal to the protection measurement and control devices of other sub-smart substations;

(6) The sub-smart substation that receives the protection action "permit" signal sends a trip command to the circuit breaker at the head end of the fault section to trip the corresponding line, thereby realizing the identification and isolation of various types of faults.

Beneficial effect, owing to having adopted above-mentioned scheme, based on the underlying data shared by the whole station of coal mine intelligent substation, fully utilized the failure information of each branch, overcomes the deficiency that traditional microcomputer protection device can only use the failure information that self obtains, The method for identifying and isolating through faults in power supply in coal mines of the invention can identify various faults and abnormal operating states, and effectively overcomes the problem that the upper and lower protection settings cannot be coordinated. It is convenient in operation and high in reliability. It solves the problems of short-circuit leapfrog tripping and leakage protection in the coal mine power supply system, effectively reduces the scope of coal mine power outages, and improves the reliability and safety of coal mine power supply system operation. It completely solves the problems of various through-faults in the power supply system of coal mines, especially the non-selective problems of leapfrog tripping and leakage protection, and achieves the purpose of the present invention.

Advantages: Based on the system structure and shared underlying data of the regional centralized control coal mine intelligent substation, through the cooperation of the intelligent substation and the centralized control center protection host, the identification of faults and the location of fault sections within the system are realized, ensuring The selectivity of the protection action completely solves the problem of through power supply faults in the power supply system of coal mines, solves the common special power supply problems in coal mines, the problem of short-circuit leapfrog tripping and vertical non-selectivity of leakage protection, and is simple and easy to operate, accurate in judgment and high in reliability. specialty.

Description of drawings

Fig. 1 is a flowchart of the method for identifying and isolating through faults of power supply systems in coal mines according to the present invention.

Fig. 2 is a structural diagram of the scheme for identifying and isolating through-faults of the coal mine power supply system according to the present invention.

Fig. 3 is the protection logic of the sub-smart substation protection measurement and control device of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Embodiment 1: in Fig. 1, the present invention comprises the following steps:

(1) The ground and underground substations are respectively built as sub-smart substations, and a station control layer with a regional centralized control center is built on the ground as the public station control layer of each sub-smart substation. The public station control layer coordinates and controls each sub-smart substation , the protection and control devices of each sub-smart substation complete the identification of faults, and the protection host of the centralized control center completes the judgment of the fault section within the system range.

(2) The regional centralized control center has the function of fault identification and isolation. The regional centralized control center includes a centralized control center host and a display. The centralized control center host collects the fault information sent by the protection and measurement and control modules of each substation, and performs Comprehensive judgment to realize the identification and isolation of faults, display the analysis results on the background interface for topology coloring, display the fault section and fault type on the display, and issue a fault alarm;

(3) Each sub-smart substation collects or samples the system voltage and each branch current data, calculates and judges and identifies various fault types and abnormal operating states, and then proceeds to the following steps;

(4) The protection, measurement and control devices of each sub-smart substation organize GOOSE messages and send them to the host of the regional centralized control center according to the identified fault types and abnormal operation status;

The GOOSE abbreviation is Generic Object Oriented Substation Event, which means in Chinese: general object-oriented substation event;

(5) According to the fault type and abnormal operation status information uploaded by the protection measurement and control devices of each sub-smart substation, the protection host of the centralized control center locates the fault section through the fault section location software, and provides protection to the sub-smart substation where the fault section is located. The measurement and control device sends a protection action "permit" signal, and sends a protection action "blocking" signal to other sub-smart substation protection measurement and control devices. The protection host of the centralized control center completes the judgment of the fault section within the system, and does not affect the independent fault judgment and relay protection function of each substation. This is realized by the protection logic configured on the protection measurement and control device at the bay layer, as shown in Figure 3 As shown, the "local signal" is "0" when it is normal, it is "1" when a fault occurs, "delay T" is "0" when the delay time T is not over, and it is "1" after the delay ends. "Blocking" is "1" when it receives the "action permission" signal from the protection host of the centralized control center, and it is "0" when it receives the "action blocking" signal. When the short-term temporary fault disappears or the protection device is activated by mistake After recovery, the "local signal" changes from "1" to "0". Even if the "action permission" signal issued by the centralized control center is received, the protection measurement and control device will not make the protection work. It can be seen that the host's "action permission" Or the "action blocking" signal only assists the protection and control devices of each bay to complete the location of the fault section within the scope of multiple intelligent substations in the mine to ensure the longitudinal selectivity of protection, but it will not affect the result of fault judgment by the protection, measurement and control devices of the bay. If the protection measurement and control device does not receive the "action permission" signal, but the "local signal" is "1" and the delay time T ends, it means that the switch of the lower level protection refuses to move. At this time, the "delay T" becomes " 1", the protection logic output of the protection measurement and control device of the bay layer is "1", at this time, the protection is used as the backup protection of the lower protection to remove the fault;

(6) The sub-smart substation that receives the "action permission" signal from the protection host of the centralized control center sends a trip command to the smart terminal at the head end of the fault section, and the smart terminal trips the corresponding switch to ensure the selection of the protection action To realize the identification and isolation of multi-level traversal faults.

The present invention has no selectivity for various through-faults of the coal mine power supply system, especially over-level tripping and leakage protection. Based on the system structure and shared underlying data of the regional centralized control coal mine intelligent substation, the main engine is protected through the sub-intelligent substation and the centralized control center. The cooperation of the system realizes the identification of faults and the location of fault sections within the system, ensures the selectivity of protection actions, and completely solves the problem of power supply faults in power supply systems in coal mines. It has the characteristics of simple operation, accurate judgment and high reliability. .

Claims (1)

1. passing through property of a Coal Mine Power Distribution System Fault Identification and partition method, it is characterized in that: Fault Identification and partition method, be that fault section isolation are comprehensively judged by collecting unified processing of each sub-intelligent substation information in station level District integrated control center, comprise the following steps:

(1) each transformer station of ground and down-hole builds up respectively sub-intelligent substation, builds up the public station level as each sub-intelligent substation with the station level at District integrated control center on ground, and public station level is coordinated to control to each sub-intelligent substation;

(2) described District integrated control center has Fault Identification and isolation features, the District integrated control center comprises centralized control center's main frame and display, centralized control center's main frame is collected the fault message sent on the protection and measurement and control module of each sub-intelligent substation, comprehensively judge, realize identification and the isolation of fault, analysis result is shown and carries out topology coloring at background interface, show fault section and fault type and can send fault alarm on display;

(3) each sub-intelligent substation collection or sampling system voltage and each branch current data, calculate and judge and identify various fault types and irregular operating state, and then carry out following steps;

(4) the protection measure and control device of each sub-intelligent substation, the fault type identified according to it and irregular operating state organize the GOOSE message up sending to the District integrated control central host;

(5) centralized control center's main frame is uploaded according to the protection measure and control device of each sub-intelligent substation fault type and irregular operating state information, judge the section of guilty culprit by fault section location software, protection measure and control device to the sub-intelligent substation at fault section place issues protection action " permissions " signal, issues protection to the protection measure and control device of other sub-intelligent substations and moves " locking " signal;

(6) the sub-intelligent substation of receiving protection action " permission " signal issues trip signal to the circuit breaker of fault section head end, the circuit that tripping is corresponding, thus realize identification and the isolation of all kinds fault.

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