CN202749797U - Column breaker with zero sequence current indication function - Google Patents
Column breaker with zero sequence current indication function Download PDFInfo
- Publication number
- CN202749797U CN202749797U CN 201220368185 CN201220368185U CN202749797U CN 202749797 U CN202749797 U CN 202749797U CN 201220368185 CN201220368185 CN 201220368185 CN 201220368185 U CN201220368185 U CN 201220368185U CN 202749797 U CN202749797 U CN 202749797U
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- Prior art keywords
- sequence current
- current
- zero
- zero sequence
- circuit breaker
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Abstract
The utility model discloses a column breaker with the zero sequence current indication function. The column breaker can distinguish ground connection fault sections. The column breaker comprises three current transformers, primary windings of the three current transformers are respectively in serial connection with three-phase power supply lines (A, B and C) on the load side of the column breaker, and the dotted terminals of secondary windings of the three current transformers are connected to be led out from a K1 end and a K2 end to be connected with two ends of an ampere meter to form a zero sequence current circuit. Zero sequence current can be accurately measured, single-phase ground connection fault can be judged, ground connection fault sections can be timely and accurately judged, normal operation of power grids can be guaranteed, and power supply equipment can be protected.
Description
Technical field
The utility model relates to the power switchgear of distribution line, especially has the pole-mounted circuit breaker of zero-sequence current deixis, is a kind of pole-mounted circuit breaker that can distinguish the earth fault section.
Background technology
Along with the lifting of user to the power supply reliability requirement; higher to power distribution network on-pole switch equipment requirement; the pole-mounted circuit breaker protective device that now generally uses generally is that A, C biphase current instrument transformer form; only act on short trouble; because the biphase current instrument transformer can't synthesize zero-sequence current, so pole-mounted circuit breaker does not all have the zero-sequence current deixis.Owing to do not dispose the zero-sequence current indicating device, when single phase ground fault appearred in distribution network system, pole-mounted circuit breaker can't measure zero-sequence current, can't judge whether to exist single phase ground fault.In order to overcome the above problems the research of domestic existing demarcation circuit breaker and demarcation load switch, such as the patent of patent name for " demarcation circuit breaker, the application number of the synthetic zero-sequence current of vector are 200810136213.1 ".But still have following two shortcomings: 1, in the zero-sequenceprotection function aspects, because of the supply power mode of most of transformer station employing underload, short radius, the system capacitance amount is very little, when single phase ground fault occurs when, zero-sequence current is very little, can't guarantee selectivity, causes easily and is failure to actuate or misoperation; 2, be not suitable for some to the demanding place of power supply reliability; do not affect normal power supply during small current neutral grounding system ground connection; when apparatus insulated level reaches requirement; sustainable operation a period of time; especially for oil field etc. power supply reliability is required higher place, the zero-sequence current protection function is used limitation.Also exist following problem for another patent name for patents such as " intellectual boundary load switch, application numbers: 200620122673.5 ": this technology is based on the on-load switch design, because on-load switch can't cut-off short circuit current, when being short-circuited fault, on-load switch can not excise faulty line, isolated fault.Conventional pole-mounted circuit breaker does not have the zero-sequence current deixis, and therefore, when single phase ground fault appearred in distribution network system, pole-mounted circuit breaker can't measure zero-sequence current, can't judge whether to exist single phase ground fault.
Summary of the invention
The purpose of this utility model provides the pole-mounted circuit breaker with zero-sequence current deixis, for setting up the zero-sequence current deixis on the existing pole-mounted circuit breaker, so that when single phase ground fault appears in the distrbution network system, pole-mounted circuit breaker can measure zero-sequence current, thereby judges whether to exist single phase ground fault.
The technical solution of the utility model is: the pole-mounted circuit breaker with zero-sequence current deixis comprises three current transformers, and a winding of three current transformers is connected with three-phase power line A, B and the C of pole-mounted circuit breaker load side respectively; Be connected with K2 to draw by the K1 end after the Same Name of Ends of the secondary winding of three current transformers connects and be connected formation zero-sequence current loop with the two ends of ammeter afterwards.
Compared with prior art, the beneficial effects of the utility model are: designed the zero-sequence current loop on the utility model and indicated by ammeter, can accurately measure zero-sequence current, thereby judge whether to exist single phase ground fault, in order to judge timely and accurately the earth fault section.Guarantee the normal operation of electrical network, the protection power supply unit.
Description of drawings
Accompanying drawing 1 is circuit connection diagram of the present utility model.
Embodiment
By reference to the accompanying drawings the utility model is described further, referring to accompanying drawing, pole-mounted circuit breaker with zero-sequence current deixis comprises three current transformers, with current transformer 1,3 expressions of current transformer 2 summation current transformers, a winding of three current transformers is connected with three-phase power line A, B and the C of pole-mounted circuit breaker 5 load side respectively among the figure; The Same Name of Ends of the secondary winding of three current transformers connects to be connected with K2 to draw afterwards by the K1 end afterwards and is connected with the two ends of ammeter 4, consist of the zero-sequence current loop, accurately measure zero-sequence current, thereby judge whether to exist single phase ground fault, so that disengagement failure timely and accurately.When power distribution network generation single phase ground fault, fault current current flowing instrument transformer 1, current transformer 2 summation current transformers 3, its secondary current ammeter 4 of flowing through indicates size of current, and the staff judges fault section according to size of current.
Claims (1)
1. the pole-mounted circuit breaker that has the zero-sequence current deixis comprises three current transformers, it is characterized in that a winding of three current transformers is connected with three-phase power line A, B and the C of pole-mounted circuit breaker (5) load side respectively; Be connected with K2 to draw by the K1 end after the Same Name of Ends of the secondary winding of three current transformers connects and be connected formation zero-sequence current loop with the two ends of ammeter (4) afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220368185 CN202749797U (en) | 2012-07-28 | 2012-07-28 | Column breaker with zero sequence current indication function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220368185 CN202749797U (en) | 2012-07-28 | 2012-07-28 | Column breaker with zero sequence current indication function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202749797U true CN202749797U (en) | 2013-02-20 |
Family
ID=47709149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220368185 Expired - Fee Related CN202749797U (en) | 2012-07-28 | 2012-07-28 | Column breaker with zero sequence current indication function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202749797U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516225A (en) * | 2013-09-25 | 2014-01-15 | 无锡阿比利德电力科技有限公司 | Three-phase current selector switch |
-
2012
- 2012-07-28 CN CN 201220368185 patent/CN202749797U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516225A (en) * | 2013-09-25 | 2014-01-15 | 无锡阿比利德电力科技有限公司 | Three-phase current selector switch |
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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: 20130220 Termination date: 20130728 |