CN104993448A - Distribution substation low-voltage intelligent reclosing method - Google Patents

Abstract

The invention relates to a distribution substation low-voltage intelligent reclosing method. When a low-voltage distribution substation runs normally, a main control unit of a switching control device cyclically reads current values and switching position signals of an outlet switch to detect whether outlet circuit breakers are normal or not; and a reclosing judgment process is started when that the circuit breakers are in an open state is detected, and in the process, whether a remote/local operation selection knob is in a local position is judged first, and if the remote/local operation selection knob is in a local position, whether the circuit breakers are opened manually is judged, staff is notified through a short message, and no control treatment is performed on the site. According to the method, power supply is restored quickly through one trial closing operation, and the workload of maintenance personnel is reduced; and full consideration is given to fault information and status of a low-voltage main inlet switch and a low-voltage outlet switch in the closing process, and the heat capacity of a low-voltage cable outlet line is calculated in order to avoid blackout area expansion caused by closing accidents.

Description

Power distribution station low-voltage intelligent reclosing method

Technical field

The invention belongs to electrical operation field, relate to low-voltage distribution network, especially a kind of power distribution station low-voltage intelligent reclosing method.

Background technology

Along with the development of intelligent grid, at present when middle voltage distribution networks automation has started large area propelling, the intelligent distributed self-healing of middle pressure and middle-voltage network can both realize automation completely in the situation of fault, this alleviates the workload of operations staff widely, also improve power supply reliability simultaneously, but simultaneously, due to the continuous growth of low pressure basic load, and when peak, the structural growth of peak suction load, for secondary network, increasing pressure is large, be reflected in actual low pressure management, especially easily occur low voltage failure.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art part, a kind of power distribution station low-voltage intelligent reclosing method is provided.

The technical scheme that technical solution problem of the present invention adopts is:

A kind of power distribution station low-voltage intelligent reclosing method, concrete steps are as follows:

(1) low-voltage distribution station under normal operating conditions, and whether the main control unit circulation of switching control device reads out current value and the switch position signal of wiretap, normal to detect each wire-outgoing breaker;

(2) when detecting that circuit breaker is in open position, start reclosing and judge flow process, in this flow process, first knob is selected to judge to a distant place/local operation, see and whether be in regard to position, if a distant place/local operation selects knob to be in regard to position, judge that circuit breaker is artificial manual brake separating, by SMS notification staff, any control treatment is not done to scene;

(3) when a distant place/local operation selects knob to be in remote location, whether having fault tripping signal to determine whether by detection circuit breaker needs to carry out reclosing process, when without any fault tripping signal, then the current value combined before and after the tripping operation moment carries out synthetic determination again, determine to be caused by old circuit breaker malfunction, then need to carry out reclosing operation, transmission breaker open operation and result of determination note are to work area staff simultaneously;

(4) if detect, circuit breaker defines fault tripping signal, overload action is determined whether in this link, if overload action can prepare time delay and attempt reclosing, the time of time delay was decided by the heat radiation time of cable line, if without any corresponding accident information, then transmission breaker open operation and judged result information are to work area staff, do not enter reclosing process;

(5), after entering reclosing processing procedure, first judge whether circuit breaker has existed reclosing process in 10min, if having, this coincidence process of locking; When detection does not exist coincidence process before this, be for further processing.

Advantage of the present invention and good effect are:

1, this method is for distinguishing artificial manual on-the-spot separating brake and accident separating brake, installs a distant place/local operation additional and selects knob, effectively distinguish both of these case, avoid because field service separating brake or manual brake separating cause equipment malfunction in each outlet.

2, this method is transformation for existing power distribution station and upgrading, and its distinguishing feature does not have larger change just fully can realize the intelligent Application at low-voltage distribution station to existing low-voltage distribution system.

3, the concept that middle ballast closes a floodgate is incorporated in low-voltage network by this method, by once trying incompatiblely to reach the workload restoring electricity and reduce attendant fast, and in making process, take into full account fault message and the quantity of state of low pressure total input-wire switch and low-pressure line-outgoing switch, and to low-voltage cable outlet close a floodgate front thermal capacity adjust, with avoid close a floodgate in accident, expansion is caused to power supply interrupted district.

Accompanying drawing explanation

Fig. 1 is the structural representation of present system.

Embodiment

Below in conjunction with accompanying drawing, also by specific embodiment, the invention will be further described, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.

A kind of power distribution station low-voltage intelligent reclosing system, comprise low-pressure line-outgoing cabinet 3, low voltage incoming line cabinet 1, switching control device 2 and a distant place/local operation and select knob 4, described switching control device comprises main control unit, power module, battery, signal receiving module and signal transmitting module, main control unit is connected with power module, battery, signal receiving module respectively, signal receiving module communication connection signal sending module.The main control unit of switching control device, power module, battery, signal receiving module are installed in low voltage incoming line cabinet, the signal transmitting module of switching control device is installed in low-pressure line-outgoing cabinet, this signal transmitting module is connected with the switch in each loop, the conjunction accessing each circuit switching divides position signalling, fault trip (SDE) signal, and selector switch signal.Each signal transmitting module controls 4 loops, and on low-pressure line-outgoing cabinet panel, corresponding every primary Ioops is installed one distant place/local operation and selected knob, distinguishes manual brake separating and switch automatic trip for being in operation.

Described conjunction divides position signalling to access to be mainly and correctly to carry out operating rear feedback, guarantees that the correct and guidance command in the position of the switch performs and puts in place; Fault tripping signal (SDE) mainly provides the entry condition of troubleshooting, and selector switch signal mainly provides distant place barring condition on the spot.

Described switching control device is existing apparatus, and its structure and working principle does not describe at this.

A kind of power distribution station low-voltage intelligent reclosing method, concrete steps are as follows:

1) low-voltage distribution station under normal operating conditions, and whether the main control unit circulation of switching control device reads out current value and the switch position signal of wiretap, normal to detect each wire-outgoing breaker.

2) when detecting that circuit breaker is in open position, starting reclosing and judging flow process; In this flow process, first select knob to judge to a distant place/local operation, see and whether be in regard to position, if a distant place/local operation selects knob to be in regard to position, judge that circuit breaker is artificial manual brake separating, by SMS notification staff, any control treatment is not done to scene.

3) when a distant place/local operation selects knob to be in remote location, whether having fault tripping signal to determine whether by detection circuit breaker needs to carry out reclosing process.When without any fault tripping signal, then the current value combined before and after the tripping operation moment carries out synthetic determination again, determine to be caused by old circuit breaker malfunction, then need to carry out reclosing operation, transmission breaker open operation and result of determination note are to work area staff simultaneously.

4) if detect, circuit breaker defines fault tripping signal, determines whether overload action in this link, if overload action can prepare time delay attempt reclosing, the time of time delay was decided by the heat radiation time of cable line.If without any corresponding accident information, then transmission breaker open operation and judged result information are to work area staff, do not enter reclosing process.

5) after entering reclosing processing procedure, first judge whether circuit breaker has existed reclosing process in 10min, if having, this coincidence process of locking; When detection does not exist coincidence process before this, be for further processing.

As required, in transmission control command process, introduce manual intervention to guarantee the reliability of closing a floodgate, also according to responding and restore electricity principle fast, fully automatic mode can be adopted simultaneously, directly enter and control breaker closing control procedure; Successfully put reclosing Success Flag position as closed a floodgate, and send note of successfully closing a floodgate.If unsuccessful reclosing, put failure flags position equally, send failed SMS notification manual intervention of closing a floodgate.

Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and under the prerequisite not departing from inventive concept, can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (1)

1. a power distribution station low-voltage intelligent reclosing method, concrete steps are as follows:

(1) low-voltage distribution station under normal operating conditions, and whether the main control unit circulation of switching control device reads out current value and the switch position signal of wiretap, normal to detect each wire-outgoing breaker;

(2) when detecting that circuit breaker is in open position, start reclosing and judge flow process, in this flow process, first knob is selected to judge to a distant place/local operation, see and whether be in regard to position, if a distant place/local operation selects knob to be in regard to position, judge that circuit breaker is artificial manual brake separating, by SMS notification staff, any control treatment is not done to scene;

(3) when a distant place/local operation selects knob to be in remote location, whether having fault tripping signal to determine whether by detection circuit breaker needs to carry out reclosing process, when without any fault tripping signal, then the current value combined before and after the tripping operation moment carries out synthetic determination again, determine to be caused by old circuit breaker malfunction, then need to carry out reclosing operation, transmission breaker open operation and result of determination note are to work area staff simultaneously;

(4) if detect, circuit breaker defines fault tripping signal, overload action is determined whether in this link, if overload action can prepare time delay and attempt reclosing, the time of time delay was decided by the heat radiation time of cable line, if without any corresponding accident information, then transmission breaker open operation and judged result information are to work area staff, do not enter reclosing process;

(5), after entering reclosing processing procedure, first judge whether circuit breaker has existed reclosing process in 10min, if having, this coincidence process of locking; When detection does not exist coincidence process before this, be for further processing.