CN201608515U - Electric arc light protecting system for feeder cable in switch cabinet - Google Patents
Electric arc light protecting system for feeder cable in switch cabinet Download PDFInfo
- Publication number
- CN201608515U CN201608515U CN2010201043533U CN201020104353U CN201608515U CN 201608515 U CN201608515 U CN 201608515U CN 2010201043533 U CN2010201043533 U CN 2010201043533U CN 201020104353 U CN201020104353 U CN 201020104353U CN 201608515 U CN201608515 U CN 201608515U
- Authority
- CN
- China
- Prior art keywords
- output
- current
- feeder cable
- signal
- arc light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
An electric arc light protecting system for a feeder cable in a switch cabinet comprises arc light sensors, a current signal acquisition circuit, a single chip microcomputer and a relay. Two arc light sensors are respectively installed on partition boards of a cable chamber and a breaker chamber; an output end of each arc light sensor is connected with a signal conversion circuit; output of the signal conversion circuit is transmitted to a first disjunction gate; the current signal acquisition circuit comprises a plurality of current acquisition units; each current acquisition unit comprises three current mutual inductor; an output signal end of each current mutual inductor is connected to a second disjunction gate; output ends of the second disjunction gate and the first disjunction gate are both connected to a conjunction gate; an output end of the conjunction gate is connected to one input end of the single chip microcomputer; a control feeder cable of the relay is connected with a circuit breaker; and a control coil of the circuit breaker is connected to an output end of the single chip microcomputer. The electric arc light protecting system can effectively prevent failure spreading of electric arc light, and has no influence on normal power supply of healthy feeder cables.
Description
Technical field
The utility model relates to a kind of improved mesolow switch cubicle arclight protection system, belongs to the resist technology field.
Background technology
The inner arc fault of switch cubicle is a kind of very serious short trouble in the distribution system, if do not take to monitor timely and effectively and safeguard measure, tends to cause serious economy loss.Therefore, be necessary in switch cubicle, to carry out arclight monitoring and protection.
For preventing misoperation, mesolow switch cubicle arclight protection system need be judged arc fault according to overcurrent and the dual criterion of arclight.It utilizes the arclight sensor acquisition arclight signal on the dividing plate that is installed in the switch cubicle bus-bar room, and by inlet wire current instrument transformer collection overcurrent signal, have only when system collects arc optical signal and overcurrent signal simultaneously, just can cut off incoming power, prevent that the arclight fault from further spreading by the circuit breaker of service entrance switch cabinet.
But when switch cubicle feeder cable section generation arclight fault, owing to can't detect the arclight signal, the switch cubicle incoming power can not in time be found and cut off to the arclight protection system.Have only when the feeder cable fault upwards to spread to bus-bar room, system acquisition just can be implemented protection during to arc optical signal, has so just increased the loss that the arclight fault is caused greatly.In addition; traditional electrical arc light protection system can not be differentiated the feeder cable of arclight guilty culprit, as long as action will be cut off the power supply of whole section bus, causes all feeder cables all to cut off the power supply; cause great economic loss, run counter to the principle of the reliable power supply of power system security.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, the arclight that is used for feeder cable in a kind of switch cubicle protection system is provided.
Problem described in the utility model realizes with following technical proposals:
The arclight protection system that is used for feeder cable in a kind of switch cubicle, it comprises arc photosensor, current signal Acquisition Circuit, single-chip microcomputer and relay; Described arc photosensor is provided with two, is installed in respectively on the dividing plate of cable vault and breaker chamber, and the output of arc photosensor connects signaling conversion circuit, and latter's output delivers to first or door; Described current signal Acquisition Circuit comprises a plurality of current acquisitions unit, each current acquisition unit comprises three current transformers, connect three phase lines of same road feeder cable respectively, its output signal end be connected to second or the door, second or gate output terminal and first or gate output terminal all be connected to and door, be connected to an input of single-chip microcomputer with the output of door; Described relay control circuit breaker that feeder cable connects, its control coil connects the output of single-chip microcomputer.
The arclight protection system that is used for feeder cable in the above-mentioned switch cubicle; described signaling conversion circuit comprises pull-up resistor, phototriode and inverter; the input end of described phototriode connects the output of arc photosensor; the input of the output termination inverter of phototriode, the output of inverter is the output of the arc light signal of telecommunication.
The arclight protection system that is used for feeder cable in the above-mentioned switch cubicle; output at each current transformer is provided with signal conditioning circuit; described signal conditioning circuit comprises rectifier bridge and A/D converter; the output of the input termination current transformer of described rectifier bridge; output connects the input of A/D converter through voltage stabilizing circuit, the current signal after the described A/D converter output conditioning.
The utility model is installed an arc photosensor respectively on the dividing plate of cable vault and breaker chamber, be used to monitor the arclight fault in cable vault and the breaker chamber.When system's generation arclight fault, no matter fault is positioned at which position of switch cubicle, and arc optical signal can both arrive by protected system monitoring, has improved the reliability of protection system greatly.Simultaneously, because the current signal Acquisition Circuit can be monitored the overcurrent in each road feeder cable respectively, thereby this device can also be according to the particular location of guilty culprit, come the circuit breaker of disengagement failure feeder cable by relay, prevented effectively that not only fault from spreading, and can not influence the normal power supply of other feeder cable, reduced the economic loss that the arclight fault is caused.
Description of drawings,
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the scheme of installation of arc photosensor;
Fig. 2 is an electrical schematic diagram of the present utility model.
Each label is among the figure: JC0, switch cubicle lead-in circuit breaker; JC1～JC3, feeder cable circuit breaker; BH, arclight protection system; G1, G2, arc photosensor; P1, P2, inverter; CT0, switch cubicle inlet wire current instrument transformer; CT1, CT2, CT3, feeder cable current transformer; The threephase current transformer of CTA, CTB, CTC, same road feeder cable; Q1, Q2, phototriode; U1, first or the door; U2, with the door; U3, single-chip microcomputer; U4, second or the door; U5, the 3rd or the door; U6, U7, U8, A/D converter; ZQ1, ZQ2, ZQ3, rectifier bridge; J, protection relay; LED, alarm lamp; D1, D2, D3, voltage stabilizing didoe; R1～R5, resistance.
Embodiment
Feeder cable section part (being breaker chamber and cable vault) in the utility model protection switch cabinet, the switch cubicle external cabling is not within protection range.Traditional arclight protection system is all installed arc photosensor in circuit breaker and cable vault, and cable vault's part occurred frequently that is fault, reason has following several:
1, cable end is made by hand, long-time running, ageing of insulation;
2, the cable end crimp quality is bad, and contact resistance is big, long-time running cable end local overheating;
3, feeder cable switch frequent operation;
4, cable long-time running, insulation quality descends.
Therefore, arc photosensor is installed is very important in the cable vault.
Referring to Fig. 2, the input of the output termination phototriode Q1 (Q2) of arc photosensor G1 (G2), the change-over circuit that is made of phototriode and pull-up resistor R1 (R2) converts the light signal that arc photosensor G1 (G2) is exported to the signal of telecommunication, this signal is admitted to the input of inverter P1 (P2), the output output of inverter P1 (P2) and the synchronous signal of telecommunication of light signal of arc photosensor G1 (G2) output.U1 be first or the door, its output end signal is the real arcs light signal.Three current transformer CTA, CTB, CTC gather the three-phase overcurrent signal of same road feeder cable, and ZQ1, ZQ2, ZQ3 are three rectifier bridges, are used for converting the AC signal that three current transformer CTA, CTB, CTC gather to direct current signal.Voltage stabilizing didoe D1, D2, D3 and resistance R 1, R2, R3 constitute three voltage stabilizing circuits; U6, U7, U8 are three one A/D converters, are used to adjust second or the input level of door U4.
First or the real arcs light signal of door U1 output with second or the overcurrent signal of door U4 output with door U2 in send into single-chip microcomputer after carrying out AND operation P0.0 hold.
When arc fault occurring, single-chip microcomputer makes the outage of respective feed connection cable by P1.0 end output trip signal, prevents that fault from further enlarging.Alarm lamp LED lights simultaneously, sends alarm signal.As seen from Figure 1, when alarm lamp LED lights, arc fault being arranged not necessarily, might be that abnormal current causes, and at this moment even without tripping operation, also tackles switch cubicle and overhauls.
The situation of only having drawn one road feeder cable among Fig. 2, CTA, CTB, CTC are three current transformers of same road feeder cable, if will protect the multichannel feeder cable, then every feeder cable disposes cover arclight protection system of the present utility model respectively.
Claims (3)
1. be used for the arclight protection system of feeder cable in the switch cubicle, it is characterized in that it comprises arc photosensor, current signal Acquisition Circuit, single-chip microcomputer (U3) and relay; Described arc photosensor is provided with two, is installed in respectively on the dividing plate of cable vault and breaker chamber, and the output of arc photosensor connects signaling conversion circuit, and latter's output delivers to first or door (U1); Described current signal Acquisition Circuit comprises a plurality of current acquisitions unit, each current acquisition unit comprises three current transformers, connect three phase lines of same road feeder cable respectively, its output signal end be connected to second or the door (U4), second or gate output terminal and first or gate output terminal all be connected to and door (U2), be connected to an input of single-chip microcomputer (U3) with the output of door (U2); Described relay control circuit breaker that feeder cable connects, its control coil connects the output of single-chip microcomputer.
2. according to the arclight protection system that is used for feeder cable in the described switch cubicle of claim 1; it is characterized in that; described signaling conversion circuit comprises pull-up resistor, phototriode and inverter; the input end of described phototriode connects the output of arc photosensor; the input of the output termination inverter of phototriode, the output of inverter is the output of the arc light signal of telecommunication.
3. according to the arclight protection system that is used for feeder cable in claim 1 or the 2 described switch cubicles; it is characterized in that; output at current transformer is provided with signal conditioning circuit; described signal conditioning circuit comprises rectifier bridge and A/D converter; the output of the input termination current transformer of described rectifier bridge; output connects the input of A/D converter through voltage stabilizing circuit, the current signal after the described A/D converter output conditioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201043533U CN201608515U (en) | 2010-02-01 | 2010-02-01 | Electric arc light protecting system for feeder cable in switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201043533U CN201608515U (en) | 2010-02-01 | 2010-02-01 | Electric arc light protecting system for feeder cable in switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201608515U true CN201608515U (en) | 2010-10-13 |
Family
ID=42953216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201043533U Expired - Fee Related CN201608515U (en) | 2010-02-01 | 2010-02-01 | Electric arc light protecting system for feeder cable in switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201608515U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248017A (en) * | 2013-05-15 | 2013-08-14 | 南京弘毅电气自动化有限公司 | 100-percent fast protection system and method for internal fault of switch cabinet |
| CN112630610A (en) * | 2020-12-09 | 2021-04-09 | 安科瑞电气股份有限公司 | Arc light microcomputer protection device based on double-wire cable transmission |
-
2010
- 2010-02-01 CN CN2010201043533U patent/CN201608515U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248017A (en) * | 2013-05-15 | 2013-08-14 | 南京弘毅电气自动化有限公司 | 100-percent fast protection system and method for internal fault of switch cabinet |
| CN103248017B (en) * | 2013-05-15 | 2015-12-23 | 南京弘毅电气自动化有限公司 | Internal faults of switch cabinet 100% rapid protection system and guard method |
| CN112630610A (en) * | 2020-12-09 | 2021-04-09 | 安科瑞电气股份有限公司 | Arc light microcomputer protection device based on double-wire cable transmission |
| CN112630610B (en) * | 2020-12-09 | 2023-09-01 | 安科瑞电气股份有限公司 | Arc light microcomputer protection device based on double-wire cable transmission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111146755B (en) | Feeder terminal and line protection device | |
| CN201590653U (en) | Photoelectric arc light protection system | |
| CN102623967A (en) | Medium-low voltage bus electrical arc light protection method and system | |
| CN109936057B (en) | Intelligent integrated power supply and control system thereof | |
| WO2017043754A1 (en) | Electronic watt-hour meter for transmitting power failure information in real-time and method for transmitting power failure information in real-time | |
| CN105356426A (en) | Arc light protection device resistant to non-electric arc light interference | |
| CN201608515U (en) | Electric arc light protecting system for feeder cable in switch cabinet | |
| CN204144926U (en) | A kind of arc light protective device | |
| CN201616666U (en) | Multifunctional short circuit protecting system of middle and low-voltage switch cabinet | |
| CN201563174U (en) | Video monitoring front-end control box | |
| CN201199630Y (en) | Leakage protector with zero-off protection | |
| CN102025131A (en) | Arc light monitoring and protecting system | |
| CN202550499U (en) | Arc light protection system for middle-low-voltage busbar | |
| CN203014357U (en) | GOOSE message/switch value conversion device for relay protection digitized transformation | |
| CN201629565U (en) | Switch cabinet arc light protection system with compact structure | |
| CN102435832B (en) | Single-phase distribution transformer operation monitoring metering device | |
| CN201557212U (en) | Network optical-fiber access cabinet | |
| CN201608563U (en) | Electric arc light intelligent remote monitoring system | |
| CN201860172U (en) | Automatic looped network type distribution network based on reclosers | |
| CN204694795U (en) | Surge arrester failure indicating circuit | |
| CN203278057U (en) | Intelligent prefabricated transformer substation | |
| CN201611775U (en) | Arc light monitoring and protecting device for bus compartment | |
| CN201450318U (en) | Automatic false ground preventive low-voltage power distribution device | |
| CN201623473U (en) | Bus-bar room arc light monitoring and protective device of high reliability | |
| CN203204103U (en) | Electrical signal monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101013 Termination date: 20150201 |
|
| EXPY | Termination of patent right or utility model |