CN102570416A - Method for searching grounding point of low-current grounding system and line for checking grounding point of low-current grounding system - Google Patents

Abstract

The invention relates to the technical field of power transformation lines, in particular to a method for searching a grounding point of a low-current grounding system and a line for checking the grounding point of the low-current grounding system. A short-message platform sends converting station B10KBIM grounding to a low-current grounding system fault searching group, so that the fault searching group works, and quickly finds out the fault of a phase A of a line L4; a switch DL4 of the line L4 is cut off immediately through scheduling, so that the 10KVIM grounding disappears, the voltage is normal, and a line L1, a line L2 and a line L3 are supplied with power normally; and therefore, power failures of the line L1, the line L2 and the line L3 of a user are reduced, the power supply reliability is improved, and complicated operation is reduced.

Description

A kind of small current neutral grounding system earth point lookup method and inspection circuit

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[technical field]

The present invention relates to electric power power transformation circuit technical field, relate in particular to a kind of small current neutral grounding system earth point lookup method and inspection circuit.

[background technology]

At present, in the 10KV small current neutral grounding system, single-phase earthing is a kind of common provisional fault; After single-phase earthing took place, the fault phase-to-ground voltage reduced, and the phase voltage of non-fault two phases raises; But line voltage is symmetry still; Thereby do not influence continuous power supply to the user, and system can move 1～2h, and this also is the great advantage of small current neutral grounding system.But electrical network long-time running when if single phase ground fault takes place,, possibly cause that the weak link of insulation is breakdown, develop into phase fault, accident is enlarged, influence user's normal electricity consumption because of two phase-to-ground voltages of non-fault raise 1.73 times.Also possibly make the voltage transformer iron core seriously saturated, cause the serious overload of voltage transformer and burn.Arc grounding also can cause the total system overvoltage simultaneously, and then damage equipment, destroys system safety operation.Therefore, the operator on duty must be familiar with the processing method of earth fault, when single phase ground fault takes place, must in time find faulty line to excise.

The method that adopts at present is: earlier electrical network is divided into the electric discrete several parts that, adopts the examination method along separate routes of drawing to select then, until choosing faulty line, the method selects accuracy rate high if electric network composition is simple, and the processing time is short; If complex electric network selects accuracy rate low, the processing time is long, and power grid security is had serious threat.

Concrete grammar: first open-circuit line L1 switch DL1 ground connection does not disappear and closes immediately, open-circuit line L2 switch DL2 ground connection does not disappear and closes immediately, open-circuit line L3 switch DL3 ground connection does not disappear and closes immediately, open-circuit line L4 switch DL4 ground connection disappears, and 10KV, IM voltage recover normal.Notice is safeguarded unit line L4 ground connection, to the charged line inspection of circuit L4.Circuit L1, circuit L2, circuit L3 all have power failure in short-term at this moment, and circuit L4 has a power failure and finishes and can send to troubleshooting.The 10KV IM ground connection time of the B of transformer station is also long, is a kind of threat to system safety operation.

[summary of the invention]

For overcoming the deficiency in the background technology, the present invention provides a kind of small current neutral grounding system earth point lookup method and inspection circuit.Have the dead line of minimizing bar number, shorten select time, improved operating efficiency, increased amount of power supply, improved benefit.

In order to realize the foregoing invention purpose, the present invention adopts technical scheme following:

A kind of small current neutral grounding system earth point inspection circuit comprises: SMS platform, fault finder, actuator, and said SMS platform links to each other with fault finder through wireless network, and fault finder links to each other with actuator through controller.

A kind of small current neutral grounding system earth point inspection circuit, said fault finder is separately positioned on the disconnect end of subscriber's line through controller and actuator.

A kind of small current neutral grounding system earth point lookup method, its step is following:

1), be judged as the 10KV IM A of system phase ground connection, when the A of 10KV system phase ground connection, the A phase voltage reduces, B, C phase voltage raise; At first the #2 main transformer is added operation system is divided into two systems, it is normal that 10KV IIM voltage recovers; When 1 0KV IM voltage A phase voltage is still low, B, C phase voltage are still high; Be judged as the 10KV IM A of system phase ground connection;

2), be judged as 10KV IM ground connection after, search group through SMS platform to low current neutral grounding system fault and send the B 10KB IM of transformer station ground connection, the work of trouble shoot group; Find circuit L4 A phase fault rapidly, dispatch open-circuit line L4 switch DL4 immediately, 10KV IM ground connection disappears; Voltage is normal, make circuit L1, circuit L2, circuit L3 not need to have a power failure, and has reduced the power failure of subscriber's line L1, circuit L2, circuit L3; Improve power supply reliability, reduced loaded down with trivial details operation.

Because adopt aforesaid technical scheme, the present invention has following superiority:

A kind of small current neutral grounding system earth point lookup method and inspection circuit can reduce user's amount that has a power failure to greatest extent, improve the mains supply reliability, increase electricity charge income, and the electricity consumption client unnecessary use electric loss.Have the dead line of minimizing bar number, shorten select time, improved operating efficiency, increased amount of power supply, improved benefit.

[description of drawings]

Fig. 1 is the wiring circuit diagram of the B of transformer station;

Fig. 2 is the inspection circuit block-diagram of the B of transformer station;

[embodiment]

Like Fig. 1, shown in 2: the B of transformer station small current neutral grounding system earth point circuit; #1 main transformer BT1, #2 main transformer BT2, bus-tie circuit breaker, disconnect; #1 main transformer BT1 links to each other with bus 10KV IM through bus-tie circuit breaker, and the disconnect that bus 10KV IM is connected with subscriber's line L1, circuit L2, circuit L3, circuit L4 respectively links to each other; #2 main transformer BT2 links to each other with bus 10KV I IM through bus-tie circuit breaker, and the disconnect that bus 10KV I IM is connected with subscriber's line L5, circuit L6, circuit L7, circuit L8 respectively links to each other; Bus 10KV IM links to each other with bus 10KV IIM through disconnect.

Small current neutral grounding system earth point inspection circuit comprises: SMS platform, fault finder, actuator, and said SMS platform links to each other with fault finder through wireless network, and fault finder links to each other with actuator through controller.Said fault finder is separately positioned on the disconnect end of subscriber's line through controller and actuator.The B of transformer station normal mode is: #1 main transformer BT1 operation band bus 10KV IM, bus 10KV IIM load, BT2 is subsequent use for the #2 main transformer.When the A of 10KV system phase ground connection, the A phase voltage reduces, and B, C phase voltage raise.At this moment, at first the #2 main transformer is added operation system is divided into two systems, find that 10KV IIM voltage recovers normal this moment, 10KV IM voltage A phase voltage is still low, and B, C phase voltage are still high.Be judged as the 10KV IM A of system phase ground connection thus.

Method is: set up a low current neutral grounding system fault and search group, personnel comprise plant maintenance unit, Customer Service Center, run unit etc., utilize SMS platform that the group member is listed as into a group; Set up a standardized administration flow process, promptly when fault took place, scheduling utilized SMS platform to release news; After corresponding personnel receive information, take active action, find out the fault point as early as possible; And report scheduling, supply the scheduling reference.Scheduling utilizes sub-block, and open failure circuit has rapidly guaranteed safety, the reliability service of fault-free circuit.

Concrete grammar: after being judged as 10KV IM ground connection; Search group through SMS platform to low current neutral grounding system fault and send the B 10KB IM of transformer station ground connection; The A phase fault of circuit L4 is found in trouble shoot group or fault finder work rapidly, and notice scheduling or actuator be open-circuit line L4 switch DL4 immediately; 10KV IM ground connection disappears, and voltage is normal.Circuit L1, circuit L2, circuit L3 do not need to have a power failure, and reduce user's power failure, improve power supply reliability, reduce unnecessary operation, have increased amount of power supply.

Claims (3)

1. a small current neutral grounding system earth point is checked circuit, it is characterized in that: comprising: SMS platform, fault finder, actuator, and said SMS platform links to each other with fault finder through wireless network, and fault finder links to each other with actuator through controller.

2. a kind of small current neutral grounding system earth point inspection circuit according to claim 1, it is characterized in that: said fault finder is separately positioned on the disconnect end of subscriber's line through controller and actuator.

3. small current neutral grounding system earth point lookup method, it is characterized in that: its step is following:

1), be judged as the 10KV IM A of system phase ground connection, when the A of 10KV system phase ground connection, the A phase voltage reduces, B, C phase voltage raise; At first the #2 main transformer is added operation system is divided into two systems, it is normal that 10KV IIM voltage recovers; When 1 0KV IM voltage A phase voltage is still low, B, C phase voltage are still high; Be judged as the 10KV IM A of system phase ground connection;

2), be judged as 10KV IM ground connection after, search group through SMS platform to low current neutral grounding system fault and send the B 10KB IM of transformer station ground connection, the work of trouble shoot group; Find circuit L4 A phase fault rapidly, dispatch open-circuit line L4 switch DL4 immediately, 10KV IM ground connection disappears; Voltage is normal, make circuit L1, circuit L2, circuit L3 not need to have a power failure, and has reduced the power failure of subscriber's line L1, circuit L2, circuit L3; Improve power supply reliability, reduced loaded down with trivial details operation.

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