CN201812665U - Anti-resonance three-phase voltage transformer - Google Patents
Anti-resonance three-phase voltage transformer Download PDFInfo
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- CN201812665U CN201812665U CN2010205792146U CN201020579214U CN201812665U CN 201812665 U CN201812665 U CN 201812665U CN 2010205792146 U CN2010205792146 U CN 2010205792146U CN 201020579214 U CN201020579214 U CN 201020579214U CN 201812665 U CN201812665 U CN 201812665U
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- phase voltage
- instrument transformer
- zero sequence
- voltage instrument
- sequence current
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Abstract
An anti-resonance three-phase voltage transformer comprises an A-phase voltage transformer, a B-phase voltage transformer, a C-phase voltage transformer and a zero sequence current transformer, wherein the second terminal of the primary winding of the three-phase voltage transformer is served as a neutral point, and all the transformers are grounded through the primary winding of the zero sequence current transformer, so the impedance between the neutral point of the primary winding of the three-phase voltage transformer and the ground is very high, when an electrical power distribution system has failure, the neutral point of the primary winding of each voltage transformer can not drift; the primary winding of the zero sequence current transformer is connected between the neutral point of the primary winding of each voltage transformer and the ground in series, so the zero sequence loop parameter formed by the primary winding of the three-phase voltage transformer and the electrical power distribution circuit on ground capacitance is greatly changed, series resonance is further avoided, and therefore resonance failure is difficult to occur; and in addition, the measurement of the three-phase voltage transformer and the monitoring of the secondary winding are separate and do not interfere with each other, and the whole anti-flashing capacity is improved.
Description
Technical field
The utility model relates to the antiresonance threephase potential transformer that is used on the electric power transmission line.
Background technology
At present; threephase potential transformer on the electric power transmission line; very easily cause voltage transformer generation ferro resonance after the ground connection in various degree in electric power system and cause and burn in a large number; not only cause power failure also can cause potential safety hazard; and then cause the situation that maintenance personal's labour intensity is big, work is dangerous; if a kind of antiresonance threephase potential transformer can be provided; not only antiresonance; can also be used for voltage, electric energy measurement and connect protective relaying device doing used for relay protection, can satisfy on the present electric power transmission line functional requirement voltage transformer.
The utility model content
The purpose of this utility model provides a kind of antiresonance threephase potential transformer.
A kind of antiresonance threephase potential transformer, wherein: comprise A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor, first end of A, B, a winding of C phase voltage instrument transformer connects A, B, the C phase connection of electric power transmission line respectively, second end of A, B, a winding of C phase voltage instrument transformer all connects first end of a winding of zero sequence current mutual inductor, the second end ground connection of a winding of zero sequence current mutual inductor; The secondary winding of A, B, C phase voltage instrument transformer and zero sequence current mutual inductor includes first section, second section, first section first end of A, B, C phase voltage instrument transformer secondary winding is neutral point, each neutral point all is connected in second section the first end neutral point of zero sequence current mutual inductor secondary winding, second section the second end ground connection of zero sequence current mutual inductor secondary winding, first section second end of A, B, C phase voltage instrument transformer secondary winding are respectively applied between any two and connect the metered voltage table; All be used to be connected a monitoring voltage table between second section first end of A, B, C phase voltage instrument transformer secondary winding and the ground, second section second end of A, B, C phase voltage instrument transformer secondary winding is neutral point, and each neutral point all is connected in second section the first end neutral point of zero sequence current mutual inductor secondary winding; The coil that is used to connect the resonance alarm relay between first section first end of zero sequence current mutual inductor secondary winding, second end, first section the second end ground connection of zero sequence current mutual inductor secondary winding.
Described antiresonance threephase potential transformer, wherein: first and second winding of A phase voltage instrument transformer adopts first and second winding of indoor epoxy resin one moulding by casting, B phase voltage instrument transformer to adopt first and second winding of indoor epoxy resin one moulding by casting, C phase voltage instrument transformer to adopt first and second winding of indoor epoxy resin one moulding by casting, zero sequence current mutual inductor to adopt indoor epoxy resin one moulding by casting; First end of A, B, a winding of C phase voltage instrument transformer, second end of a winding of zero sequence current mutual inductor all are provided with terminal stud on the top of corresponding instrument transformer pour mass, and each terminal stud all is enclosed with insulating barrier and anti-pollution flashover skirt outward successively.
Described antiresonance threephase potential transformer, wherein: the bottom of A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor is provided with terminal box, respective terminal is set, each binding post and the interior corresponding connection of secondary winding link of corresponding instrument transformer pour mass in the terminal box.
Described antiresonance threephase potential transformer, wherein: the iron core of described A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor all adopts the cold-reduced silicon sheet closed assembly to constitute, the end that each iron core stretches out outer first side of corresponding instrument transformer pour mass fixes by clamping plate, and the end that each iron core stretches out outer second side of corresponding instrument transformer pour mass fixes by another clamping plate.
Described antiresonance threephase potential transformer, wherein: the bottom of described A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor pour mass fixes by a base.
The utility model will reach following technique effect after adopting technique scheme:
Antiresonance threephase potential transformer of the present utility model, second end of a winding of threephase potential transformer is a neutral point, all by winding earth of zero sequence current mutual inductor, make between winding neutral point of threephase potential transformer and the earth and have very high impedance, when electric power distributing system generation earth fault, drift can not take place in winding neutral point of each voltage transformer; Be connected in series a winding of zero sequence current mutual inductor between winding neutral point of each voltage transformer and the earth, make zero sequence loop parameter that winding of threephase potential transformer and electric power transmission line direct-to-ground capacitance constitute greatly for a change, break away from the series resonance boundary far away, more difficult generation resonance accident, in addition, the metering of threephase potential transformer, the monitoring secondary winding is separated from each other, do not disturb mutually, each the phase secondary winding that is used to measure can provide accurately, and line voltage supplies table instrumentation amount to use, each the phase secondary winding that is used to monitor can provide phase voltage accurately, uses for reflection antiresonance threephase potential transformer insulation against ground monitoring of the present utility model; Further,, increased antiresonance threephase potential transformer of the present utility model effective creepage distance over the ground, improved whole anti-pollution flashover ability by anti-pollution flashover skirt.
Description of drawings
Fig. 1 is the circuit catenation principle figure of antiresonance threephase potential transformer of the present utility model;
Fig. 2 is the Facad structure schematic diagram of antiresonance threephase potential transformer of the present utility model;
Fig. 3 is the side structure schematic diagram of antiresonance threephase potential transformer of the present utility model.
Embodiment
Antiresonance threephase potential transformer of the present utility model, wherein: comprise A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor, its circuit connection diagram as shown in Figure 1, first end of A, B, a winding of C phase voltage instrument transformer connects A, B, the C phase connection of electric power transmission line respectively, second end of A, B, a winding of C phase voltage instrument transformer all connects first end of a winding of zero sequence current mutual inductor, the second end ground connection of a winding of zero sequence current mutual inductor; The secondary winding of A, B, C phase voltage instrument transformer and zero sequence current mutual inductor includes first section, second section, first section first end of A, B, C phase voltage instrument transformer secondary winding is neutral point n, each neutral point n all is connected in second section the first end neutral point n of zero sequence current mutual inductor secondary winding, second section the second end a ground connection of zero sequence current mutual inductor secondary winding, first section second end 1a, 1b, the 1c of A, B, C phase voltage instrument transformer secondary winding is respectively applied between any two and connects the metered voltage table; All be used to be connected a monitoring voltage table between second section first end 2a, 2b of A, B, C phase voltage instrument transformer secondary winding, 2c and the ground, second section second end of A, B, C phase voltage instrument transformer secondary winding is neutral point n, each neutral point n all is connected in second section the first end neutral point n of zero sequence current mutual inductor secondary winding, by second section second end a ground connection of zero sequence current mutual inductor secondary winding; The coil that is used to connect resonance alarm relay YJ between first section the first end da, the second end dn of zero sequence current mutual inductor secondary winding, first section the second end dn ground connection of zero sequence current mutual inductor secondary winding.
Second end of a winding of threephase potential transformer is a neutral point, all by winding earth of zero sequence current mutual inductor, make between winding neutral point of threephase potential transformer and the earth and have very high impedance, when electric power distributing system generation earth fault, drift can not take place in winding neutral point of each voltage transformer; Be connected in series a winding of zero sequence current mutual inductor between winding neutral point of each voltage transformer and the earth, make zero sequence loop parameter that winding of threephase potential transformer and electric power transmission line direct-to-ground capacitance constitute greatly for a change, break away from the series resonance boundary far away, more difficult generation resonance accident, in addition, the metering of threephase potential transformer, the monitoring secondary winding is separated from each other, do not disturb mutually, each the phase secondary winding that is used to measure can provide accurately, and line voltage supplies table instrumentation amount to use, each the phase secondary winding that is used to monitor can provide phase voltage accurately, uses for reflection antiresonance threephase potential transformer insulation against ground monitoring of the present utility model.
See Fig. 2, Fig. 3, first and second winding that first and second winding that first and second winding that first and second winding of A phase voltage instrument transformer adopts indoor epoxy resin one cast to constitute pour mass 1A, B phase voltage instrument transformer adopts indoor epoxy resin one cast to constitute pour mass 1B, C phase voltage instrument transformer adopts indoor epoxy resin one cast to constitute pour mass 1C, zero sequence current mutual inductor adopts indoor epoxy resin one cast to constitute pour mass 2; First end of A, B, a winding of C phase voltage instrument transformer, second end of a winding of zero sequence current mutual inductor all are provided with terminal stud on the top of corresponding instrument transformer pour mass, and the insulating barrier of each terminal stud wraps up anti-pollution flashover skirt 1A1,1B1,1C1,2N outward respectively on A, B, C phase voltage instrument transformer, the zero sequence current mutual inductor.
By anti-pollution flashover skirt, increased antiresonance threephase potential transformer of the present utility model effective creepage distance over the ground, improved whole anti-pollution flashover ability.
A phase voltage instrument transformer pour mass 1A, B phase voltage instrument transformer pour mass 1B, C phase voltage instrument transformer pour mass 1C, the bottom of zero sequence current mutual inductor pour mass 2 is provided with terminal box, in the terminal box of A phase voltage instrument transformer pour mass 1A corresponding secondary winding connector 1a is set, 2a, the binding post 1a of n, n, 2a, in the terminal box of B phase voltage instrument transformer pour mass 1B corresponding secondary winding connector 1b is set, 2b, the binding post 1b of n, 2b, n, in the terminal box of C phase voltage instrument transformer pour mass 1C corresponding secondary winding connector 1c is set, 2c, the binding post 1c of n, 2c, n is provided with corresponding secondary winding connector a in the terminal box of zero sequence current mutual inductor pour mass 2, n, da, the binding post a of dn, n, da, dn.
By each binding post in the terminal box, can be easily the splicing ear of each instrument transformer secondary winding be connected with coil, each metering, the monitoring voltage epiphase of corresponding resonance protection relay YJ.
Iron core in A phase voltage instrument transformer, B phase voltage instrument transformer, the C phase voltage instrument transformer adopts three-phase three-limb iron core 3, the iron core of zero sequence current mutual inductor adopts single-phase two-legs type core 4, the iron core 3 of described A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, the iron core 4 of zero sequence current mutual inductor all adopt the cold-reduced silicon sheet closed assembly to constitute, the end that iron core 3 and iron core 4 stretch out outer first side of corresponding instrument transformer pour mass fixes by clamping plate 51, and the end that iron core 3 and iron core 4 stretch out outer first side of corresponding instrument transformer pour mass fixes by clamping plate 52.
The bottom of described A phase voltage instrument transformer pour mass 1A, B phase voltage instrument transformer pour mass 1B, C phase voltage instrument transformer pour mass 1C, zero sequence current mutual inductor pour mass 2 fixes by a base 6.
To sum up, antiresonance threephase potential transformer of the present utility model has anti-frequency division, industrial frequency resonance, can overexcitation not burn, but long-time running and does not have the filter of overtemperature under the situation of electric power transmission line single-phase earthing; In addition, also can be used for voltage, electric energy measurement and connect protective relaying device doing used for relay protection, satisfied on the present three-phase power transmission line functional requirement voltage transformer.
Claims (5)
1. antiresonance threephase potential transformer, it is characterized in that: comprise A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor, first end of A, B, a winding of C phase voltage instrument transformer connects A, B, the C phase connection of electric power transmission line respectively, second end of A, B, a winding of C phase voltage instrument transformer all connects first end of a winding of zero sequence current mutual inductor, the second end ground connection of a winding of zero sequence current mutual inductor; The secondary winding of A, B, C phase voltage instrument transformer and zero sequence current mutual inductor includes first section, second section, first section first end of A, B, C phase voltage instrument transformer secondary winding is neutral point, each neutral point all is connected in second section the first end neutral point of zero sequence current mutual inductor secondary winding, second section the second end ground connection of zero sequence current mutual inductor secondary winding, first section second end of A, B, C phase voltage instrument transformer secondary winding are respectively applied between any two and connect the metered voltage table; All be used to be connected a monitoring voltage table between second section first end of A, B, C phase voltage instrument transformer secondary winding and the ground, second section second end of A, B, C phase voltage instrument transformer secondary winding is neutral point, and each neutral point all is connected in second section the first end neutral point of zero sequence current mutual inductor secondary winding; The coil that is used to connect the resonance alarm relay between first section first end of zero sequence current mutual inductor secondary winding, second end, first section the second end ground connection of zero sequence current mutual inductor secondary winding.
2. antiresonance threephase potential transformer as claimed in claim 1 is characterized in that: first and second winding of A phase voltage instrument transformer adopts first and second winding of indoor epoxy resin one moulding by casting, B phase voltage instrument transformer to adopt first and second winding of indoor epoxy resin one moulding by casting, C phase voltage instrument transformer to adopt first and second winding of indoor epoxy resin one moulding by casting, zero sequence current mutual inductor to adopt indoor epoxy resin one moulding by casting; First end of A, B, a winding of C phase voltage instrument transformer, second end of a winding of zero sequence current mutual inductor all are provided with terminal stud on the top of corresponding instrument transformer pour mass, and each terminal stud all is enclosed with insulating barrier and anti-pollution flashover skirt outward successively.
3. antiresonance threephase potential transformer as claimed in claim 2, it is characterized in that: the bottom of A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor is provided with terminal box, respective terminal is set, each binding post and the interior corresponding connection of secondary winding link of corresponding instrument transformer pour mass in the terminal box.
4. antiresonance threephase potential transformer as claimed in claim 3, it is characterized in that: the iron core of described A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor all adopts the cold-reduced silicon sheet closed assembly to constitute, the end that each iron core stretches out outer first side of corresponding instrument transformer pour mass fixes by clamping plate, and the end that each iron core stretches out outer second side of corresponding instrument transformer pour mass fixes by another clamping plate.
5. antiresonance threephase potential transformer as claimed in claim 4 is characterized in that: the bottom of described A phase voltage instrument transformer, B phase voltage instrument transformer, C phase voltage instrument transformer, zero sequence current mutual inductor pour mass fixes by a base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205792146U CN201812665U (en) | 2010-10-27 | 2010-10-27 | Anti-resonance three-phase voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205792146U CN201812665U (en) | 2010-10-27 | 2010-10-27 | Anti-resonance three-phase voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201812665U true CN201812665U (en) | 2011-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205792146U Expired - Fee Related CN201812665U (en) | 2010-10-27 | 2010-10-27 | Anti-resonance three-phase voltage transformer |
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| Country | Link |
|---|---|
| CN (1) | CN201812665U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105869846A (en) * | 2016-05-02 | 2016-08-17 | 钱才英 | High-voltage-electricity zero sequence current transformer for electric transmission line |
| CN106783098A (en) * | 2017-03-02 | 2017-05-31 | 国网甘肃省电力公司兰州供电公司 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
| CN107768123A (en) * | 2017-10-23 | 2018-03-06 | 湖北霞光电力设备有限公司 | A kind of intelligent power-off protection electromagnetic potential transformer |
| CN107966602A (en) * | 2016-10-19 | 2018-04-27 | 河南华盛隆源电气有限公司 | A kind of residual voltage harvester |
| CN112259347A (en) * | 2020-12-21 | 2021-01-22 | 中国电力科学研究院有限公司 | Power supply type voltage transformer and electric energy metering device |
-
2010
- 2010-10-27 CN CN2010205792146U patent/CN201812665U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105869846A (en) * | 2016-05-02 | 2016-08-17 | 钱才英 | High-voltage-electricity zero sequence current transformer for electric transmission line |
| CN107966602A (en) * | 2016-10-19 | 2018-04-27 | 河南华盛隆源电气有限公司 | A kind of residual voltage harvester |
| CN106783098A (en) * | 2017-03-02 | 2017-05-31 | 国网甘肃省电力公司兰州供电公司 | Three-phase electricity magnetic-type resonance free voltage transformer wiring group |
| CN107768123A (en) * | 2017-10-23 | 2018-03-06 | 湖北霞光电力设备有限公司 | A kind of intelligent power-off protection electromagnetic potential transformer |
| CN112259347A (en) * | 2020-12-21 | 2021-01-22 | 中国电力科学研究院有限公司 | Power supply type voltage transformer and electric energy metering device |
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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: 20110427 Termination date: 20111027 |