CN202602264U - Anti-interference microcomputer protective relaying device - Google Patents
Anti-interference microcomputer protective relaying device Download PDFInfo
- Publication number
- CN202602264U CN202602264U CN 201220141858 CN201220141858U CN202602264U CN 202602264 U CN202602264 U CN 202602264U CN 201220141858 CN201220141858 CN 201220141858 CN 201220141858 U CN201220141858 U CN 201220141858U CN 202602264 U CN202602264 U CN 202602264U
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- control cable
- microcomputer protective
- protective relay
- relay device
- cable
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Abstract
The utility model relates to an electric power protection system, and specially discloses an anti-interference microcomputer protective relaying device, which is connected to transformer station switchyard primary equipment through a control cable. Two ends of the control cable are respectively connected to the ground; one end of the cable shield layer of the control cable near to the transformer station switchyard primary equipment is connected to the ground through a grounding protection element; and the other end of the cable shield layer of the control cable near to the microcomputer protective relaying device is directly connected to the ground. One end of the cable shield layer of the control cable near to the transformer station switchyard primary equipment is connected to the ground through a grounding protection element, which is conducive to limit the grounding current or an interference current, and thereby the danger that the shield layer is burned out caused by a too large grounding current or interference current is prevented.
Description
Technical field
The utility model relates to power protection system, relates in particular to a kind of jamproof microcomputer protective relay device.
Background technology
Along with developing rapidly of electric utility, the electric power system capacity is increasing.In order to work and security needs, electric power system and electric equipment thereof must adopt various safeguard measures, and relaying protection promptly is a kind of routine techniques, at present microcomputer protective relay devices that adopt more.
For microcomputer protective relay device, its environmental interference that receives is normally comparatively serious, and this interference characteristics frequency is high, and amplitude is big, and the duration is short, the smooth easily coupling through various distributed capacitance.And microcomputer machine protective relaying device is that high-speed synchronous is carried out under the strictness control of timeticks; These disturb in case swarms into, and cause then that gently action postpones, and are heavy then cause program suspension or make mistakes; When serious even damage element, thus anti-interference be an important content of microcomputer protective relay.
The prior art microcomputer protective relay device, except that in design of hardware and software, carry out anti-interference, reduce interference source and be its most directly with essential method.Generally speaking, ground connection is to reduce microcomputer protective relay device to disturb effective measures, and common earthing mode comprises modes such as suspension ground connection, single-point grounding and multipoint earthing.Existing microcomputer protective relay device adopts 2 grounding schemes usually; It specifically is the cable shield two-terminal-grounding that makes the control cable between microcomputer protective relay device and the transformer substation switch field primary equipment; When earth-current is excessive, possibly cause cable shield to burn, need design a kind of grounding scheme of new microcomputer protective relay device thus.
The utility model content
In view of this, the utility model purpose is to provide a kind of jamproof microcomputer protective relay device, can prevent that the earth cable layer of microcomputer protective relay device from burning, thereby improves the system safety performance.
For solving above technical problem; The technical scheme that the utility model provides is: a kind of jamproof microcomputer protective relay device; Its with transformer substation switch field primary equipment between be connected through control cable; The two ends of said control cable are ground connection respectively, and said control cable leans on an end cable screen of transformer substation switch field primary equipment through ground protection element ground connection, and said control cable is leaned on the direct ground connection of other end cable shield of microcomputer protective relay device.
More excellent ground, the length of said control cable is greater than 30m.
More excellent ground, said ground protection element is connected to apart from the position of transformer substation switch field primary equipment 6m～8m.
More excellent ground, said protection component is an earth resistance.
More excellent ground, said earth resistance is a Zinc-oxide piezoresistor.
More excellent ground, the resistance of said earth resistance equates with the resistance of the screen equivalent resistance of said control cable.
Compared with prior art; In the jamproof microcomputer protective relay device of the utility model; Control cable leans on an end cable screen of transformer substation switch field primary equipment through ground protection element ground connection, and control cable is leaned on the direct ground connection of other end cable shield of microcomputer protective relay device, and it has kept the good resistance interference effect of 2 ground connection of tradition; Also limited simultaneously the size of earth-current or interference, can avoid earth-current or disturb the danger of burning the control cable screen when excessive.
Description of drawings
Fig. 1 is the ground connection sketch map of the jamproof microcomputer protective relay device of the utility model.
Embodiment
The core concept of the jamproof microcomputer protective relay device of the utility model is; Control cable leans on an end cable screen of transformer substation switch field primary equipment through ground protection element ground connection; Control cable is leaned on the direct ground connection of other end cable shield of microcomputer protective relay device; Through the size of electric current or interference restrictedly, can effectively avoid earth-current or disturb the danger of burning the control cable screen when excessive.
In order to make those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.
Referring to Fig. 1, the preferred embodiment of the grounding scheme of the jamproof microcomputer protective relay device of expression the utility model.Among this embodiment; Be connected through control cable 2 between jamproof microcomputer protective relay device 1 and the transformer substation switch field primary equipment 3; This control cable 2 is made up of cable core 21 and cable shield 22; This cable shield 22 wraps cable core 21 to reduce electromagnetic interference; Wherein: control cable 2 leans on an end cable screen 22 of transformer substation switch field primary equipment 3 through ground protection element 4 ground connection, the other end cable shield 22 direct ground connection that control cable 2 is leaned on microcomputer protective relay device 1.
In practical power systems, therefore the length of control cable 2 can make ground protection element 4 be connected to apart from the position of transformer substation switch field primary equipment 6m～8m generally greater than 30m.Preferably, ground protection element 4 is an earth resistance, and particular type can be Zinc-oxide piezoresistor etc.The resistance R of this earth resistance equates with the cable shield 22 equivalent resistance Rs of stube cable 2, also can choose separately according to actual conditions.
In the foregoing description, the control cable 2 between microcomputer protective relay device 1 and the transformer substation switch field primary equipment 3 has adopted 2 grounding schemes, thereby has still kept the good resistance interference effect of 2 grounding schemes of tradition; Because control cable 2 leans on an end cable screen 22 of transformer substation switch field primary equipment 3 through ground protection element ground connection; Help earth current or interference current limliting; Avoid earth-current thus or disturbed the danger of burning screen when excessive; Simultaneously also can reach electromagnetic compatibility effect preferably, and can not cause negative antenna effect.
Above embodiment can prevent that the earth cable layer of microcomputer protective relay device from burning on the basis that guarantees microcomputer protective relay device good resistance jamming performance, thereby improves the system safety performance.It is simple in structure, easy-to-connect, and cost is lower, thereby has market prospects preferably.
Only be the preferred implementation of the utility model below, should be pointed out that above-mentioned preferred implementation should not be regarded as the restriction to the utility model, the protection range of the utility model should be as the criterion with claim institute restricted portion.For those skilled in the art, in spirit that does not break away from the utility model and scope, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection range of the utility model.
Claims (6)
1. jamproof microcomputer protective relay device; Its with transformer substation switch field primary equipment between be connected through control cable; The two ends of said control cable are ground connection respectively; It is characterized in that said control cable leans on an end cable screen of transformer substation switch field primary equipment through ground protection element ground connection, said control cable is leaned on the direct ground connection of other end cable shield of microcomputer protective relay device.
2. jamproof microcomputer protective relay device as claimed in claim 1 is characterized in that the length of said control cable is greater than 30m.
3. jamproof microcomputer protective relay device as claimed in claim 2 is characterized in that, said ground protection element is connected to apart from the position of transformer substation switch field primary equipment 6m～8m.
4. like claim 1,2 or 3 described jamproof microcomputer protective relay devices, it is characterized in that said protection component is an earth resistance.
5. jamproof microcomputer protective relay device as claimed in claim 4 is characterized in that, said earth resistance is a Zinc-oxide piezoresistor.
6. jamproof microcomputer protective relay device as claimed in claim 4 is characterized in that, the resistance of said earth resistance equates with the resistance of the screen equivalent resistance of said control cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220141858 CN202602264U (en) | 2012-04-06 | 2012-04-06 | Anti-interference microcomputer protective relaying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220141858 CN202602264U (en) | 2012-04-06 | 2012-04-06 | Anti-interference microcomputer protective relaying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202602264U true CN202602264U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220141858 Expired - Fee Related CN202602264U (en) | 2012-04-06 | 2012-04-06 | Anti-interference microcomputer protective relaying device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202602264U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220899A (en) * | 2013-04-01 | 2013-07-24 | 中联重科股份有限公司 | Variable grounding control device, system and method for shielding layer, and engineering machine |
| CN104104073A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Buried sewage treatment equipment fan room |
| CN104100556A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Buried sewage treatment equipment |
| CN104104238A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Drive module of power supply system of buried sewage treatment equipment fan room |
| CN105071364A (en) * | 2015-08-19 | 2015-11-18 | 国网智能电网研究院 | Method for restricting parasitic current of cable shielding layer of secondary system of transformer station |
-
2012
- 2012-04-06 CN CN 201220141858 patent/CN202602264U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220899A (en) * | 2013-04-01 | 2013-07-24 | 中联重科股份有限公司 | Variable grounding control device, system and method for shielding layer, and engineering machine |
| CN103220899B (en) * | 2013-04-01 | 2015-11-25 | 中联重科股份有限公司 | A kind of screen type variable grounding control device, system, method and engineering machinery |
| CN104104073A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Buried sewage treatment equipment fan room |
| CN104100556A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Buried sewage treatment equipment |
| CN104104238A (en) * | 2014-07-22 | 2014-10-15 | 诸暨市沃思环保技术有限公司 | Drive module of power supply system of buried sewage treatment equipment fan room |
| CN105071364A (en) * | 2015-08-19 | 2015-11-18 | 国网智能电网研究院 | Method for restricting parasitic current of cable shielding layer of secondary system of transformer station |
| CN105071364B (en) * | 2015-08-19 | 2019-05-21 | 国网智能电网研究院 | A method of limitation transformer station secondary system cable shield parasite current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20140406 |