CN104753031A - Neutral point complete-set protection device - Google Patents
Neutral point complete-set protection device Download PDFInfo
- Publication number
- CN104753031A CN104753031A CN201510200241.5A CN201510200241A CN104753031A CN 104753031 A CN104753031 A CN 104753031A CN 201510200241 A CN201510200241 A CN 201510200241A CN 104753031 A CN104753031 A CN 104753031A
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- China
- Prior art keywords
- neutral point
- transformer
- current transformer
- lightning arrester
- discharging gap
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Abstract
The invention discloses a neutral point complete-set protection device. The neutral point complete-set protection device comprises a protection device body and a transformer neutral point current transformer, wherein the current transformer is connected with a discharging gap in series, the current transformer and the discharging gap are connected with a lightning arrester and a counting device in parallel, the current transformer, the discharging gap, the lightning arrester and the counting device are connected with an isolation switch in series, the isolation switch is connected with the transformer neutral point current transformer in series, the input end of the transformer neutral point current transformer is connected to the high-voltage side of a transformer, and the output end of the transformer neutral point current transformer is connected to the low-voltage side of the transformer. The neutral point complete-set protection device is provided with the lightning arrester, the lightning arrester is used for playing a role in protecting the lightning over-voltage, a parallel-connection circuit is formed between the discharging gap and the lightning arrester, so that the discharging gap and the lightning arrester are independent from each other; the occupied floor area is saved; moreover, the assembling way is flexible, safety and reliability in operation can be realized, and the design is reasonable.
Description
Technical field
The present invention relates to protective device technical field, be specially a kind of neutral point complete set of protective apparatus.
Background technology
Neutral point complete set of protective apparatus is widely used on transformer, and is one of capital equipment in high-tension power transmission and transformation equipment, is mainly used in shielding when there is lightning overvoltage, switching overvoltage and temporary overvoltage to transformer neutral point.So occupy an important position in electric power system.Because use amount is large, require higher to functional reliability, to electric substation, the impact of the design of power plant, foundation and safe operation is all larger.At present; in high voltage switchgear field; domestic development and the utilization being mainly absorbed in intelligence energy type circuit breaker and GIS equipment; and to complete set of protective apparatus for transformer neutral point field; then still adopt traditional product structure; under the operational mode of this traditional product structure; because thunderbolt, single-phase grounding fault etc. can cause neutral point overvoltage; and transformer is graded insulation mostly; therefore the insulation of overvoltage centering point causes very large threat, must arrange protective device Accident prevention occur it.
Summary of the invention
The object of the present invention is to provide a kind of neutral point complete set of protective apparatus, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme: a kind of neutral point complete set of protective apparatus, comprise protective device body and transformer neutral point current transformer, described protective device body comprises current transformer, discharging gap, lightning arrester, counting device and isolating switch, described current transformer and discharging gap are connected in series, described current transformer and discharging gap are in parallel with lightning arrester and counting device and are connected, described current transformer, discharging gap, lightning arrester and counting device are connected in series with an isolating switch, described isolating switch is connected in series with transformer neutral point current transformer, described transformer neutral point current transformer input is connected to high voltage side of transformer, output is connected to step down side.
Preferably, described lightning arrester is zinc oxide arrester.
Preferably, described isolating switch is V-type twin columns rotary structures.
Compared with prior art, the invention has the beneficial effects as follows: this neutral point complete set of protective apparatus, by being provided with lightning arrester; lightning arrester is for bearing the effect of atmospheric over voltage protection; discharging gap and lightning arrester form shunt circuit between the two, make both division of labor clear and definite, by electronic current transducer and discharging gap being connected in series; for responsible record Leakage Current; the present invention adopts the mode of combination, can save floor space, and assembling mode is flexible; safe and reliable to operation, reasonable in design.
Accompanying drawing explanation
Fig. 1 is structural circuit figure of the present invention.
In figure: 1 protective device body, 11 current transformers, 12 discharging gaps, 13 lightning arresters, 14 counting devices, 15 isolating switches, 2 transformer neutral point current transformers, a high voltage side of transformer, b step down side.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the invention provides a kind of technical scheme: a kind of neutral point complete set of protective apparatus, comprise protective device body 1 and transformer neutral point current transformer 2, described protective device body 1 comprises current transformer 11, discharging gap 12, lightning arrester 13, counting device 14 and isolating switch 15, described current transformer 11 and discharging gap 12 are connected in series, described current transformer 11 and discharging gap 12 are in parallel with lightning arrester 13 and counting device 14 and are connected, described lightning arrester 13 is zinc oxide arrester, described current transformer 11, discharging gap 12, lightning arrester 13 and counting device 14 are connected in series with an isolating switch 15, described isolating switch 15 is V-type twin columns rotary structures, described isolating switch 15 is connected in series with transformer neutral point current transformer 2, described transformer neutral point current transformer 2 input is connected to high voltage side of transformer a, output is connected to step down side b.
Operation principle: discharging gap 12 and lightning arrester 13 form shunt circuit between the two, combinational gap, atmospheric over voltage protection born by lightning arrester 13, when in system generation single phase ground fault and switch single reclosing process, discharging gap 12 does not answer discharging action, only have when system lost territory, and when there is system open-phase operation or resonance fault, discharging gap 12 action message, the insulation of the insulation of protection transformer neutral point and line side device, prevent lightning arrester 13 from blasting not because of discharge capacity and damage main transformer and neighbouring equipment, electronic current transducer 11 and discharging gap 12 are connected in series, be responsible for record Leakage Current, lightning arrester 13 monitor adopts primary current punching mode, lightning arrester 13 number of lightning strokes is recorded by being connected in parallel to counting device 14, also can on-line monitoring lightning arrester 13 leakage current, this utility structure is simple, reasonable in design.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (3)
1. a neutral point complete set of protective apparatus, comprise protective device body and transformer neutral point current transformer, it is characterized in that: described protective device body comprises current transformer, discharging gap, lightning arrester, counting device and isolating switch, described current transformer and discharging gap are connected in series, described current transformer and discharging gap are in parallel with lightning arrester and counting device and are connected, described current transformer, discharging gap, lightning arrester and counting device are connected in series with an isolating switch, described isolating switch is connected in series with transformer neutral point current transformer, described transformer neutral point current transformer input is connected to high voltage side of transformer, output is connected to step down side.
2. a kind of neutral point complete set of protective apparatus according to claim 1, is characterized in that: described lightning arrester is zinc oxide arrester.
3. a kind of neutral point complete set of protective apparatus according to claim 1, is characterized in that: described isolating switch is V-type twin columns rotary structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510200241.5A CN104753031A (en) | 2015-04-26 | 2015-04-26 | Neutral point complete-set protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510200241.5A CN104753031A (en) | 2015-04-26 | 2015-04-26 | Neutral point complete-set protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104753031A true CN104753031A (en) | 2015-07-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510200241.5A Pending CN104753031A (en) | 2015-04-26 | 2015-04-26 | Neutral point complete-set protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104753031A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140903A (en) * | 2015-09-21 | 2015-12-09 | 中电新源智能电网科技有限公司 | Transformer neutral point gas insulated substation |
| CN109004531A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of neutral resistance complexes |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06276669A (en) * | 1993-03-18 | 1994-09-30 | Nissin Electric Co Ltd | Neutral-point grounding apparatus |
| CN202153638U (en) * | 2011-07-20 | 2012-02-29 | 苏州苏高智能电气有限公司 | Complete set of protective apparatus for transformer neutral point |
| CN103532124A (en) * | 2013-07-02 | 2014-01-22 | 辽宁电力勘测设计院 | Main transformer neutral point CT arrangement system |
-
2015
- 2015-04-26 CN CN201510200241.5A patent/CN104753031A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06276669A (en) * | 1993-03-18 | 1994-09-30 | Nissin Electric Co Ltd | Neutral-point grounding apparatus |
| CN202153638U (en) * | 2011-07-20 | 2012-02-29 | 苏州苏高智能电气有限公司 | Complete set of protective apparatus for transformer neutral point |
| CN103532124A (en) * | 2013-07-02 | 2014-01-22 | 辽宁电力勘测设计院 | Main transformer neutral point CT arrangement system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140903A (en) * | 2015-09-21 | 2015-12-09 | 中电新源智能电网科技有限公司 | Transformer neutral point gas insulated substation |
| CN109004531A (en) * | 2018-07-27 | 2018-12-14 | 国网江苏省电力有限公司苏州供电分公司 | A kind of neutral resistance complexes |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150701 |