CN201315480Y - Short circuit protective device for indoor cable head - Google Patents
Short circuit protective device for indoor cable head Download PDFInfo
- Publication number
- CN201315480Y CN201315480Y CNU2008202282214U CN200820228221U CN201315480Y CN 201315480 Y CN201315480 Y CN 201315480Y CN U2008202282214 U CNU2008202282214 U CN U2008202282214U CN 200820228221 U CN200820228221 U CN 200820228221U CN 201315480 Y CN201315480 Y CN 201315480Y
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- main control
- sequence current
- control unit
- arclight
- zero
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Abstract
The utility model relates to a bus short circuit protective device, in particular to a short circuit protective device for an indoor cable head, and is characterized in that the short circuit protective device at least comprises an arc light sensor unit (3), a zero sequence current detection unit (4) and a main control unit (1), wherein, the arc light sensor unit (3) is fixed in a cable chamber (7); the zero sequence current detection unit (4) is fixedly sleeved on a three-phase feeder return circuit; the input terminal of the arc light sensor unit (3) and the input terminal of the zero sequence current detection unit (4) are electrically connected to the main control unit (1) at the same time; and the main control unit (1) is electrically connected with an executive switch. When the time that the cable head have a short circuit is less than 7 milliseconds, the fault can be quickly cleared.
Description
Technical field
The utility model relates to a kind of busbar short-circuit guard method, particularly indoor cable head short-circuit protection device.
Background technology
Be accompanied by the extensive application of cable, the weakest terminals fault of inside cable also rises in a large number, the indoor cable head fault is the most common failure in middle low-voltage distribution field, also be short-circuited hundreds of times of fault of bus, equipment and personal safety have all been caused great harm, the chain accident of also initiation that has.And in the existing relaying protection of China, also there is not special inside cable head protection.No matter be existing integrated protection, also be to use devices such as little electric current route selection, the time of failure judgement point and excision fault is long, thereby has strengthened the degree of injury of equipment.The utility model can send the failure removal instruction in 7ms, and quick tripping feeder assembly, and equipment is suffered damage, and has enriched the method for inside cable head protection, has filled up the blank in this field.
Summary of the invention
The purpose of this utility model is a kind of indoor cable head short-circuit protection device of design, so that when cable end is short-circuited less than 7ms, carries out failure removal rapidly.
The purpose of this utility model is to realize like this; the indoor cable head short-circuit protection device; it is characterized in that: which comprises at least: arclight sensing unit, zero-sequence current detecting unit, main control unit; the arclight sensing unit is fixed in the cable vault; zero-sequence current detecting unit fixed cover is on the three-phase feeder assembly; arclight sensing unit, zero-sequence current detecting unit input are electrically connected to main control unit simultaneously, and main control unit is electrically connected with the execution switch.
Described arclight sensing unit is a light-sensitive device.
Described zero-sequence current detecting unit is a zero sequence current mutual inductor.
Described main control unit connects one or more arclight sensing units.
The utility model when the two satisfies the separating brake condition simultaneously, according to arclight sensing unit position, carries out sub-switching operation owing to adopt arclight sensing unit, zero-sequence current detecting unit to provide the cable end short-circuit signal simultaneously again.Done two benefits like this, the one, adopt the arclight transducer to have the fast characteristics of reaction speed, it can fast detecting go out the arclight generation in the time of 5-7ms; Adopt arclight sensing unit, zero-sequence current detecting unit double check to have high reliability features, be not prone to misoperation.
Description of drawings
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing.
Fig. 1 is arclight produce power process and equipment debatable time figure;
Fig. 2 is the utility model embodiment schematic diagram.
Among the figure: 1, main control unit; 2, feeder line circuit breaker; 3, arclight sensing unit; 4, zero-sequence current detecting unit; 5, separating brake; 6, main control unit connecting line; 7, cable vault; 8, collection control unit.
Embodiment
As described in Figure 1, in known technology as can be known, the energy of the electric arc that produces during the cable end short circuit and process exponentially rule fast rise, beginning can not cause any damage, during to 100ms to equipment between the 85ms, cable will burn, and equipment is suffered damage.So the time that the cable end short-circuit detecting arrives is short more good more.
As shown in Figure 2, the arclight sensing unit is a light-sensitive device.The zero-sequence current detecting unit is a zero sequence current mutual inductor 4.Main control unit 1 can be connected with a plurality of arclight sensing units 3 by main control unit connecting line 6, and a plurality of main control units 1 are connected with collection control unit 8 by main control unit connecting line 6.
The indoor cable head short-circuit protection device comprises arclight sensing unit 3, main control unit 1, and arclight sensing unit 3 is fixed in the cable vault 7 of indoor switchgear, so that the arclight signal that the sensing cable head produces; Zero-sequence current detecting unit 3 is fixed on the cable feeder assembly, changes so that detect the zero-sequence current of feeder line; The signal of arclight sensing unit 3, zero-sequence current detecting unit 4 is electrically connected to main control unit 1 simultaneously, when main control unit 1 is be sure of to produce the arclight signal in the cable vault 7, the main control unit 1 further zero-sequence current in the loop by 4 pairs of feeder lines of zero-sequence current detecting unit changes and detects, when the zero-sequence current of feeder line change and cable vault 7 in generation the arclight signal the two change simultaneously, main control unit 1 is handled, is analyzed the two data, when reaching signal threshold value, provide sub-gate signal, carry out the separating brake action of switch; When not reaching the signal variation that signal threshold value will continue to detect arclight sensing unit 4.
The main control unit of setting 1 is at first carried out the open-circuit operation to this road feeder line circuit breaker 2 when carrying out sub-gate signal; When the open-circuit operation to lead-in circuit breaker has problem, will give an order to the upper level circuit breaker, finish open-circuit operation by the upper level circuit breaker.
Signal from arclight transducer 3 enters main control unit 1, and the zero sequence current signal that draws the zero-sequence current detecting unit 4 in self-feed line loop directly enters main control unit 1.The course of work is that arclight sensing unit 3 is fixed in the cable vault 7, but whether the short time tangible electric arc variation occurs in its sensing cable chamber 7, and this variation handled by main control unit 1, when cable vault 7 occurs tangible electric arc at short notice and changes, main control unit 1 changes the zero-sequence current of the zero-sequence current detecting unit 4 of feeder assembly simultaneously to be judged, when the two is undergone mutation simultaneously, main control unit 1 is handled, is analyzed the two data, determine whether and to provide separating brake 5 instructions and action by main control unit 1, carry out the separating brake action of switch.Connect by port such as RS232 or 485 interfaces between the main control unit 1, and can join with centralized control system.
Described arclight set point can freely be set in the scope of 2000Lux-36000Lux, and this depends primarily on the sensitivity requirement of system.And the zero-sequence current set point can be set as required, as set the multiplying power of basic parameter or basic parameter, as zero-sequence current output normally be output as 100mA, then the zero-sequence current set point can be set in 150mA or 200mA, this selects sensitivity flexibly according to system equally.
Claims (4)
1, indoor cable head short-circuit protection device; it is characterized in that: which comprises at least: arclight sensing unit (3), zero-sequence current detecting unit (4), main control unit (1); arclight sensing unit (3) is fixed in the cable vault (7); zero-sequence current detecting unit (4) fixed cover is on the three-phase feeder assembly; arclight sensing unit (3), zero-sequence current detecting unit (4) input are electrically connected to main control unit (1) simultaneously, and main control unit (1) is electrically connected with the execution switch.
2, indoor cable head short-circuit protection device according to claim 1 is characterized in that: described arclight sensing unit (3) is a light-sensitive device.
3, indoor cable head short-circuit protection device according to claim 1: it is characterized in that: described zero-sequence current detecting unit (4) is a zero sequence current mutual inductor.
4, indoor cable head short-circuit protection device according to claim 1: it is characterized in that: described main control unit (1) connects one or more arclight sensing units (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202282214U CN201315480Y (en) | 2008-12-10 | 2008-12-10 | Short circuit protective device for indoor cable head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202282214U CN201315480Y (en) | 2008-12-10 | 2008-12-10 | Short circuit protective device for indoor cable head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201315480Y true CN201315480Y (en) | 2009-09-23 |
Family
ID=41127280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202282214U Expired - Fee Related CN201315480Y (en) | 2008-12-10 | 2008-12-10 | Short circuit protective device for indoor cable head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201315480Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678269A (en) * | 2015-03-18 | 2015-06-03 | 国家电网公司 | Condensation alarm detection device for cable discharge of cable trench of transformer substation |
-
2008
- 2008-12-10 CN CNU2008202282214U patent/CN201315480Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678269A (en) * | 2015-03-18 | 2015-06-03 | 国家电网公司 | Condensation alarm detection device for cable discharge of cable trench of transformer substation |
| CN104678269B (en) * | 2015-03-18 | 2017-06-23 | 国家电网公司 | Cable duct of substation cable discharge optically focused alarm detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xi'an Fu Bang Scientific and Technical Industry Co., Ltd Assignor: Yang Delin Contract record no.: 2012610000035 Denomination of utility model: Short circuit protective device for indoor cable head Granted publication date: 20090923 License type: Exclusive License Record date: 20120405 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090923 Termination date: 20171210 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |