CN105158641A - Small-current grounding line selection device line-outgoing system - Google Patents
Small-current grounding line selection device line-outgoing system Download PDFInfo
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- CN105158641A CN105158641A CN201510594924.3A CN201510594924A CN105158641A CN 105158641 A CN105158641 A CN 105158641A CN 201510594924 A CN201510594924 A CN 201510594924A CN 105158641 A CN105158641 A CN 105158641A
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Abstract
A small-current grounding line selection device line-outgoing system is connected with a voltage transformer, a grounding loop and a grounding line selection device, and comprises a zero sequence current transformer input terminal, CT ends and zero sequence transformers, which are connected in sequence. The grounding line selection device is connected with a zero sequence current transformer, the voltage transformer and a contactor; by adding the CT ends and the zero sequence transformers or secondary line accessing devices to the current transformer input terminal, use needs of full cable outgoing, overhead line outgoing or mixed line outgoing are met; and when the voltage transformer detects a zero sequence voltage, the grounding loop is controlled to be connected, and then, fault lines are judged according to the current data collected by the zero sequence current transformer. The small-current grounding line selection device line-outgoing system, for line outgoing modes of different landforms, eliminates errors, realizes line fault elimination accurately and quickly, and guarantees normal work of the grounding line selection device.
Description
Technical field
The present invention relates to a kind of Small Electric Current Earthing And Routing Device and go out wire system, particularly relate to technical field of electric power detection.
Background technology
China electrical network 35KV and following transformer station adopt isolated neutral mode or neutral by arc extinction coil grounding mode mostly, these two kinds of earthing modes are after there is single-phase earthing in earthing wire-selecting system, the electric current flowing through earth point equals line distribution capacitance electric current, and numerical value is less.Therefore, these two kinds of earthing modes are claimed to be small current neutral grounding mode.After the advantage of small current neutral grounding system is that single-phase earthing occurs, system energy normal power supply (being generally 2 hours), for failture evacuation provides the time, ensures the normal operation of network system.
Arranging due to electrical network affects comparatively greatly by factors such as landform, often different terrain, after earthing wire-selecting outlet single-phase earthing, causes error different to line fault investigation, the investigation of impact lower road fault.
Summary of the invention
The present invention for the deficiency that prior art exists, provides a kind of Small Electric Current Earthing And Routing Device and goes out wire system just.
For solving the problem, the technical solution used in the present invention is as follows:
A kind of Small Electric Current Earthing And Routing Device goes out wire system, with voltage transformer (VT), ground loop is connected with line-selected earthing device, comprise the zero sequence current mutual inductor input terminal connected successively, CT end and zero-sequence transformer, line-selected earthing device respectively with zero sequence current mutual inductor, voltage transformer (VT) is connected with contactor, by current transformer input terminal installing CT end additional, zero-sequence transformer or secondary line access device, meet full cable outlet, the user demand of overhead outlet or mixing outlet method, when voltage transformer (VT) detects residual voltage, control described ground loop conducting, then according to the current data failure judgement circuit that zero sequence current mutual inductor gathers.
Further, described full cable outlet method is that a zero-sequence transformer and secondary line access device are installed in every bar outlet additional, and CT holds polarity to be consistent.
Further, the system of described overhead outlet only has A, C phase CT to hold usually, and B phase must install CT end additional, and consistent with the precision that the CT of former A phase, C phase holds, no-load voltage ratio characteristic, is connected into zero sequence filter form introducing device.
Further, described system commingled system being comprised to overhead outlet and cable outlet, it is consistent with the polarity that zero sequence current mutual inductor produces zero-sequence current that three-phase CT holds zero sequence filtrator mode to produce zero-sequence current, and no-load voltage ratio difference does not affect the judgement of device.
Compared with prior art, implementation result of the present invention is as follows in the present invention:
A kind of Small Electric Current Earthing And Routing Device of the present invention goes out wire system, for the outlet method of different terrain, eliminates error, accurately realizes the eliminating of line fault fast, ensure the normal work of line-selected earthing device.
Accompanying drawing explanation
Fig. 1 is full cable outlet system architecture schematic diagram;
Fig. 2 is overhead outlet system architecture schematic diagram;
Fig. 3 position blends wire system structural representation.
Embodiment
Below in conjunction with specific embodiments content of the present invention is described.
As Fig. 1, shown in Fig. 2 and Fig. 3, described Small Electric Current Earthing And Routing Device goes out wire system and voltage transformer (VT), ground loop is connected with line-selected earthing device, comprise the zero sequence current mutual inductor input terminal 1 connected successively, CT end 2 and zero-sequence transformer 3, line-selected earthing device respectively with zero sequence current mutual inductor, voltage transformer (VT) is connected with contactor, by current transformer input terminal installing CT end 2 additional, zero-sequence transformer 3 or secondary line access device 4, meet full cable outlet, the user demand of overhead outlet or mixing outlet method, when voltage transformer (VT) detects residual voltage, control described ground loop conducting, then according to the current data failure judgement circuit that zero sequence current mutual inductor gathers.For the outlet method of different terrain, eliminate error, accurately realize the eliminating of line fault fast, ensure the normal work of line-selected earthing device.
The zero sequence CT at same scene holds 2 electrical specifications should be basically identical, all zero sequence CT hold the necessary strict conformance of 2 polarity, especially to notice that zero sequence CT end 2 and three-phase CT hold 2 mixed scenes, for having two sections with the system of Up Highway UHW, must ensure that the CT of all introducing devices holds 2 polarity consistent, will notice that the direction of residual voltage and the direction of zero-sequence current will ensure normal condition simultaneously.Zero-sequence transformer 3 is generally installed at below cable end, after above zero-sequence transformer 3, cable sheath ground wire has to pass through CT end 2, line side ground connection; Below zero-sequence transformer 3, cable skin ground connection then can not pass zero-sequence transformer 3, avoids the formation of short-circuited conducting sleeve.
Full cable outlet method is a zero-sequence transformer 3 is installed in every bar outlet additional and secondary line access device 4, CT holds 2 polarity to be consistent as shown in Figure 1.
The system of overhead outlet as shown in Figure 2 only has A, C phase CT to hold 2, B phase must install CT end 2 additional usually, and holds the precision of 2, no-load voltage ratio characteristic consistent with the CT of former A phase, C phase, is connected into zero sequence filter form introducing device.
Outlet commingled system as shown in Figure 3 comprises the system of overhead outlet and cable outlet, and it is consistent with the polarity that zero sequence current mutual inductor produces zero-sequence current that three-phase CT holds 2 zero sequence filtrator modes to produce zero-sequence current, and no-load voltage ratio difference does not affect the judgement of device.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a Small Electric Current Earthing And Routing Device goes out wire system, with voltage transformer (VT), ground loop is connected with line-selected earthing device, it is characterized in that, comprise the zero sequence current mutual inductor input terminal connected successively, CT end and zero-sequence transformer, line-selected earthing device respectively with zero sequence current mutual inductor, voltage transformer (VT) is connected with contactor, by current transformer input terminal installing CT end additional, zero-sequence transformer or secondary line access device, meet full cable outlet, the user demand of overhead outlet or mixing outlet method, when voltage transformer (VT) detects residual voltage, control described ground loop conducting, then according to the current data failure judgement circuit that zero sequence current mutual inductor gathers.
2. a kind of Small Electric Current Earthing And Routing Device according to claim 1 goes out wire system, it is characterized in that, described full cable outlet method is that a zero-sequence transformer and secondary line access device are installed in every bar outlet additional, and CT holds polarity to be consistent.
3. a kind of Small Electric Current Earthing And Routing Device according to claim 1 goes out wire system, it is characterized in that, the system of described overhead outlet only has A, C phase CT to hold usually, B phase must install CT end additional, and consistent with the precision that the CT of former A phase, C phase holds, no-load voltage ratio characteristic, be connected into zero sequence filter form introducing device.
4. a kind of Small Electric Current Earthing And Routing Device according to claim 1 goes out wire system, it is characterized in that, described system commingled system being comprised to overhead outlet and cable outlet, it is consistent with the polarity that zero sequence current mutual inductor produces zero-sequence current that three-phase CT holds zero sequence filtrator mode to produce zero-sequence current, and no-load voltage ratio difference does not affect the judgement of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510594924.3A CN105158641A (en) | 2015-09-18 | 2015-09-18 | Small-current grounding line selection device line-outgoing system |
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| CN201510594924.3A CN105158641A (en) | 2015-09-18 | 2015-09-18 | Small-current grounding line selection device line-outgoing system |
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| CN201510594924.3A Pending CN105158641A (en) | 2015-09-18 | 2015-09-18 | Small-current grounding line selection device line-outgoing system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872859A (en) * | 2017-04-26 | 2017-06-20 | 山东钢铁集团日照有限公司 | A kind of small current earthing wire-selecting method |
| CN107290627A (en) * | 2017-07-01 | 2017-10-24 | 合肥东玖电气有限公司 | A kind of Small Electric Current Earthing And Routing Device |
| CN107356840A (en) * | 2017-07-01 | 2017-11-17 | 合肥东玖电气有限公司 | One kind is used for earth fault Small Electric Current Earthing And Routing Device |
| CN108196167A (en) * | 2018-03-08 | 2018-06-22 | 云南电网有限责任公司电力科学研究院 | Low current fault wire selection system based on piezoelectric ceramics voltage acquisition |
| CN111257798A (en) * | 2020-01-16 | 2020-06-09 | 江苏广识电气有限公司 | Method for detecting polarity of zero-sequence current of line selection and automatically correcting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872859A (en) * | 2017-04-26 | 2017-06-20 | 山东钢铁集团日照有限公司 | A kind of small current earthing wire-selecting method |
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| CN107356840A (en) * | 2017-07-01 | 2017-11-17 | 合肥东玖电气有限公司 | One kind is used for earth fault Small Electric Current Earthing And Routing Device |
| CN108196167A (en) * | 2018-03-08 | 2018-06-22 | 云南电网有限责任公司电力科学研究院 | Low current fault wire selection system based on piezoelectric ceramics voltage acquisition |
| CN111257798A (en) * | 2020-01-16 | 2020-06-09 | 江苏广识电气有限公司 | Method for detecting polarity of zero-sequence current of line selection and automatically correcting |
| CN111257798B (en) * | 2020-01-16 | 2022-05-10 | 江苏广识电气有限公司 | Method for detecting polarity of zero sequence current of line selection and automatically correcting |
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Application publication date: 20151216 |