CN215580359U - Distributed arc light protection system - Google Patents

Abstract

The utility model provides a distributed arc protection system, which relates to the field of medium and low voltage bus feeder switch cabinets and comprises a master station, a plurality of arc protection main control units, a plurality of arc units and a plurality of VAMP arc sensors, wherein the arc protection main control units are used for collecting current of a power supply point and outputting a power supply, the arc units are used for collecting signals of the VAMP arc sensors, the VAMP arc sensors are respectively arranged in a bus chamber, a breaker handcart chamber, a cable chamber and an instrument chamber of the switch cabinet, the arc protection main control units are connected with the arc protection main control units by adopting single-mode communication optical cables, the arc units are connected with the VAMP arc sensors by special optical cables, the arc units are connected with an in-station monitoring system by the arc protection main control units, the master station is connected with the arc protection main control units, and each arc protection main control unit is connected with the arc units, and each arc unit is connected with a plurality of VAMP arc sensors, and the scheme can comprehensively protect the short-circuit fault inside the switch cabinet, selectively remove the fault according to the fault position and reduce the fault range.

Description

Distributed arc light protection system

Technical Field

The utility model relates to the technical field of power equipment, in particular to a distributed arc light protection system.

Background

Medium and low voltage bus protection is generally as follows: and (3) backup overcurrent protection of the transformer: the protection circuit is used for removing bus faults, the protection action time is too long, the typical protection action time is 1.2 s-2.0 s, the effective protection effect cannot be achieved, and the backup overcurrent protection of the transformer adopting the feeder line quick-break protection locking is adopted: the bus differential protection device is used for removing bus faults, the typical protection action time is 300-500 ms, the action is faster than the backup overcurrent protection action of a transformer, but the faults can not be removed before the equipment is seriously damaged, and the bus differential protection device is characterized in that: the arc protection device is used for removing bus faults, the protection range is limited by the installation position of the CT, dead zones exist, wiring is complex, the CT requirement is high, the total cost is high, the protection cannot cover most frequent feeder faults, and the arc protection is generated for solving the short plate. However, the conventional arc protection only detects the arc signal of the bus chamber of the switch cabinet, and jumps the main transformer low-voltage side switch in combination with the overcurrent signal, so that the most frequently-broken switch chamber and cable chamber are avoided, full coverage on the arc of the switch cabinet cannot be formed, the bus protection in the true sense cannot be formed, and the characteristic of rapidity of the arc light signal cannot be fully exerted.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model aims to overcome the limitation of the existing arc protection and more flexibly and efficiently protect the short-circuit fault in the feeder cabinet. The modular hierarchy system is flexibly configured according to different occasions and adopts a multi-stage optical fiber star connection mode, and comprises a main station, a plurality of arc protection main control units, a plurality of arc units and a plurality of VAMP arc sensors, wherein the arc protection main control units are used for collecting the current of a power supply point and an outlet tripping power supply, the arc units are used for collecting the signals of the VAMP arc sensors, the plurality of VAMP arc sensors are respectively arranged in the bus chamber, the handcart chamber of a circuit breaker, the cable chamber and the instrument chamber of the switch cabinet, and the arc protection main control units are connected by adopting a single-mode communication optical cable, the arc light unit passes through special optical cable connection VAMP arc light sensor, and the arc light unit passes through arc light protection main control unit and the in-station monitored control system connection, a plurality of arc light protection main control unit are connected to the main website, and a plurality of arc light units are connected to every arc light protection main control unit, and a plurality of VAMP arc light sensor are connected to every arc light unit, and all information gather the main website, send the tripping operation order by arc light protection main control unit after comprehensive judgement, and actuating mechanism is not set for to arc light protection main control unit, and the arc light unit can not send the execution order, and such benefit is more nimble, and the information of arc light protection main control unit is more complete, can formulate more optimized tripping operation strategy.

As an improvement of the utility model, the bus chamber, the circuit breaker handcart chamber, the cable chamber and the instrument chamber are respectively provided with VAMP arc sensors.

As a refinement of the utility model, the busbar compartment is provided as a first busbar zone and a second busbar zone, which are delimited by a busbar switch.

As a modification of the utility model, the VAMP arc light sensor is associated with a power supply inlet wire and a bus-bar switch which are directly connected with the section of the bus.

As a modification of the utility model, the first busbar zone and the second busbar zone comprise a transformer low-voltage side switch, a feeder switch busbar chamber, a PT cabinet and an isolation cabinet, the transformer low-voltage side switch, the feeder switch busbar chamber, the PT cabinet and the isolation cabinet respectively correspond to a compartment, and a VAMP arc light sensor is arranged in each compartment.

As a modification of the present invention, each of the VAMP arc light sensors is an independent protection logic unit.

The utility model has the beneficial effects that:

1) because each small chamber in the switch cabinet is provided with the VAMP arc light sensor, no detection dead angle and no protection dead zone are formed in the cabinet;

2) each VAMP arc light sensor is an independent protection logic unit, so that selective tripping is realized when arc light faults occur at different positions of a cable chamber, a switch chamber, a bus chamber and the like, the expansion of a power failure range is avoided, when the bus chamber of the feeder switch cabinet detects the faults, a system jumps corresponding power supply points, when the switch chamber of the feeder switch cabinet detects the faults, the system can jump a feeder line firstly, and then jumps the power supply points or directly jumps the power supply points if the arc light does not disappear; when a cable chamber of the feeder switch cabinet detects a fault, the system jumps a corresponding feeder;

3) photoelectric conversion is completed in the device, so that the epitaxial signal line is prevented from being subjected to electromagnetic interference;

4) the modular structure can be flexibly arranged to adapt to different types of wiring.

Drawings

Fig. 1 is a schematic structural view of the protection system of the present invention.

Fig. 2 is a diagram illustrating an internal structure of the switchgear according to the present invention.

FIG. 3 is a schematic structural diagram of a dual power supply system and an arc protection system according to the present invention.

In the figure: A. the device comprises a bus chamber, a breaker handcart chamber, a cable chamber, a meter chamber, an arc light protection main control unit, an arc light unit, a VAMP arc light sensor, a special optical cable, a communication optical cable and a controller.

Detailed Description

The present invention will be further described with reference to fig. 1 to 3, but the scope of the present invention should not be limited thereto, for convenience of explanation and understanding of the technical solution of the present invention, the following description is based on the drawings,

reference figures 1 to 3 relate to a distributed arc protection system, the system includes main website, a plurality of arc protection main control unit I, a plurality of arc unit II and a plurality of VAMP arc sensor III, arc protection main control unit I is used for gathering the electric current and the export power supply of power supply point, arc unit II is used for gathering VAMP arc sensor III's signal, and a plurality of VAMP arc sensor III install respectively at cubical switchboard's generating line room A, circuit breaker handcart room B, cable chamber C and instrument room D, adopt single mode communication optical cable to connect between arc protection main control unit I and the arc protection main control unit I, arc unit II passes through special optical cable IV and connects VAMP arc sensor III, and arc unit II passes through arc protection main control unit I and the interior monitoring system connection of station, main website connects a plurality of arc protection main control unit I, and each arc protection main control unit I connects a plurality of arc unit II, every arc unit II connects a plurality of VAMP arc sensor III, VAMP arc sensor III is all installed respectively to bus chamber A, circuit breaker handcart room B, cable chamber C and instrument room D, bus chamber A establishes to first bus-bar district and second bus-bar district, first bus-bar district and second bus-bar district are through the female antithetical couplet switch demarcation, VAMP arc sensor III is relevant to this section bus lug connection's power inlet wire and female antithetical couplet switch, every VAMP arc sensor III is independent protection logic unit, and first bus-bar district and second bus-bar district include transformer low-voltage side switch, feeder switch bus-bar room A, PT cabinet and isolation cabinet, and transformer low-voltage side switch, feeder switch bus-bar room, PT cabinet and isolation cabinet correspond an interval respectively, install a VAMP arc sensor III in every interval.

When a fault occurs, the system jumps to a corresponding power supply point, and when a feeder switch cabinet switch room detects the fault, the system has two tripping strategies: the method comprises the steps of jumping a feeder line first, jumping a power point again if arc light does not disappear, directly jumping the power point, generally selecting the direct jumping power point in consideration of equipment safety, dividing a bus interval into two areas by taking a bus tie switch as a boundary of the feeder line corresponding to system jumping when a cable chamber B of a feeder switch cabinet detects a fault, enabling a VAMP arc light sensor III of the bus tie switch cabinet to be related to a power inlet wire and the bus tie switch which are directly connected with a bus of a section, jumping a current acquisition point switch of a local side when current criteria and arc light criteria are met, realizing selective tripping of the whole system, and cutting off the power point switch of the arc light generation side by an arc light unit II when a fault occurs in the bus tie switch chamber when double buses run in parallel.

Claims (6)

1. The utility model provides a distributed arc light protection system, its characterized in that, the system includes main website, a plurality of arc light protection main control unit, a plurality of arc light unit and a plurality of VAMP arc light sensor, arc light protection main control unit is used for gathering the electric current and the export power supply of power supply point, the arc light unit is used for gathering VAMP arc light sensor's signal, and a plurality of VAMP arc light sensor install respectively at the generating line room of cubical switchboard, circuit breaker handcart room, cable chamber and instrument room, adopt single mode communication optical cable connection between arc light protection main control unit and the arc light protection main control unit, the arc light unit passes through special optical cable and connects VAMP arc light sensor, the arc light unit passes through arc light protection main control unit and the interior monitoring system of station and connects,

the master station is connected with a plurality of arc protection main control units, each arc protection main control unit is connected with a plurality of arc units, and each arc unit is connected with a plurality of VAMP arc sensors.

2. The distributed arc protection system of claim 1 wherein the busbar compartment, the breaker trolley compartment, the cable compartment, and the instrumentation compartment are each fitted with a VAMP arc sensor.

3. The distributed arc protection system of claim 2 wherein the busway chamber is configured as a first busway section and a second busway section, the first busway section and the second busway section being demarcated by a busway switch.

4. The distributed arc protection system of claim 3 wherein the VAMP arc sensor is associated with a power inlet and buscouple switch to which the bus bar of the segment is directly connected.

5. The distributed arc protection system of claim 4 wherein the first and second bussing areas each comprise a transformer low side switch, a feeder switch bussing, a PT cabinet, and an isolation cabinet, the transformer low side switch, the feeder switch bussing, the PT cabinet, and the isolation cabinet each corresponding to a bay, and one VAMP arc sensor mounted in each bay.

6. The distributed arc protection system of any of claims 1-5 wherein each of the VAMP arc sensors is a separate protection logic unit.

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