CN202616018U - Through-wall current transformer - Google Patents
Through-wall current transformer Download PDFInfo
- Publication number
- CN202616018U CN202616018U CN 201220132797 CN201220132797U CN202616018U CN 202616018 U CN202616018 U CN 202616018U CN 201220132797 CN201220132797 CN 201220132797 CN 201220132797 U CN201220132797 U CN 201220132797U CN 202616018 U CN202616018 U CN 202616018U
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- China
- Prior art keywords
- current transformer
- voltage
- cover
- winding
- primary winding
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000004804 winding Methods 0.000 claims abstract description 44
- 238000005266 casting Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 2
- 210000000569 greater omentum Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Regulation Of General Use Transformers (AREA)
Abstract
The utility model discloses a through-wall current transformer and belongs to a high-voltage electrical device. The through-wall current transformer comprises a first winding, a second winding, a pouring body which is formed by pouring outside the first winding and the second winding, a voltage-sharing cover and a shielding cover. The voltage-sharing cover is arranged at one end of the first winding and the shielding cover is arranged above one end of the first winding. The through-wall current transformer can avoid potential difference inside the current transformer and then eliminate the cause of discharging electricity by the voltage-sharing cover and the shielding cover arranged on one end of the first winding and voltage sharing and shielding effects of the voltage-sharing cover and the shielding cover. Therefore, the through-wall current transformer can be used safely and reliably under damp and large-salinity environment and can meet the requirements of the II filth-grade working condition.
Description
Technical Field
The utility model relates to a high-voltage apparatus device especially relates to a wall-penetrating type current transformer.
Background
Current transformers are generally used in power grid lines as devices for current measurement and protection. In the production and manufacturing process of the existing current transformer with the contact box, no effective electric field voltage-sharing shielding measure is adopted, and the current transformer is easy to generate stronger discharge noise in power frequency voltage-withstanding and partial discharge tests and even in normal operation. The current transformer with the structure can influence the correct judgment of the main insulation defect of the transformer due to the long-term discharge, and brings great hidden danger to the safe operation of a system.
SUMMERY OF THE UTILITY MODEL
Based on the problem that above-mentioned prior art exists, the utility model discloses embodiment provides a wall-penetrating current transformer, can solve present current transformer and easily produce the problem that arc light flashover discharged or produce stronger discharge noise in the contact box of mutual-inductor, can avoid producing arc light flashover in the contact box and discharge or produce stronger discharge noise, satisfies and uses under II level filthy grade.
The utility model discloses a realize through following technical scheme:
an embodiment of the utility model provides a wall-penetrating current transformer, include: primary winding, secondary winding and the pouring body of pouring outside primary winding and secondary winding still include: a voltage-equalizing cover and a shielding cover; wherein,
the voltage-equalizing cover is arranged at one terminal of the primary winding;
the shield is disposed over the other terminal of the primary winding.
According to the technical scheme, the voltage-sharing cover and the shielding cover are arranged at one end of the primary winding, and the voltage-sharing and shielding effects of the voltage-sharing cover and the shielding cover prevent the potential difference from being generated in the current transformer, so that the reason for causing discharge is eliminated; the current transformer can be safely and reliably used in a humid environment with high salinity, and can be used under the pollution level II.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a current transformer provided in an embodiment of the present invention;
fig. 2 is an electrical connection schematic diagram of the current transformer provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The invention will be further explained with reference to the drawings and the specific embodiments.
Examples
The embodiment provides a wall-through current transformer, which is a box-type current transformer with contacts, and is suitable for power systems with rated frequency of 50Hz or 60Hz and rated voltage of 35kV or below, and can be used for electric energy metering and relay protection of a current measuring box, as shown in fig. 1, the current transformer comprises:
the transformer comprises a primary winding 1, a secondary winding 2, a voltage-sharing cover 3, a shielding cover 4 and a pouring body 6;
the primary winding 1 is coupled with the secondary winding 2, the primary winding 1 is provided with two terminals (namely a P1 terminal and a P2 terminal), the P1 terminal of the primary winding 1 is provided with a voltage-sharing cover 3 and a shielding cover 4, and the shielding cover 4 is arranged above the P1 terminal; the primary winding 1, the secondary winding 2, the voltage-sharing cover 3 and the shielding cover 4 are all cast in a casting body 6, and the casting body 6 can be formed by casting epoxy resin.
Further, the current transformer further comprises a pressure equalizing plate 5, and the pressure equalizing plate 5 is arranged at the end P2 of the primary winding.
The current transformer with the structure is provided with the voltage-sharing cover 3 and the shielding cover 4 at the end P1 of the primary winding 1, and the voltage sharing of the voltage-sharing cover 3 and the shielding effect of the shielding cover 4 are utilized, so that no potential difference exists in the current transformer, the mechanism of generating discharge is eliminated, and the current transformer is prevented from generating strong discharge noise. And, set up pressure equalizing plate 5 at the P2 end of primary winding 1, also play the voltage-sharing effect to primary winding 1, can be better avoid the inside discharge that produces of current transformer for this current transformer can be safe and reliable uses in the environment that humidity, salinity are very big, thereby satisfies and uses under II level filth grades.
Furthermore, the P1 end of the primary winding of the current transformer can be arranged in the contact box to serve as a static contact in the switch cabinet, and an umbrella cover can be arranged at the P1 end in the contact box, so that the creepage distance on the surface is increased through the umbrella cover, and arc flashover (spark) discharge generated in the contact box is avoided.
The schematic diagram of the coupling connection between the primary winding and the secondary winding in the current transformer is shown in fig. 2, wherein the secondary winding is arranged around the middle of the ends of the primary windings P1 and P2, when the ends of P1 and P2 are connected with a power supply, the secondary winding can generate current induction, and the secondary winding connectors 1S1, 1S2, 2S1 and 2S2 are connected with a measuring meter, so that the magnitude of current and voltage can be measured, and the measurement of electric energy flowing through the primary winding can be realized.
To sum up, the utility model discloses current transformer through increase voltage-sharing cover, shield cover and the voltage-sharing board in the one end of primary winding, deuterogamies the epoxy pouring mode, makes this current transformer inside not have the potential difference, has eliminated the mechanism that produces discharge, has avoided producing stronger discharge noise. The partial discharge value of the current transformer is very small, is less than 10pC under the withstand voltage of 28kV, can be safely and reliably used in the environment with humidity and high salinity, and meets the requirement of being used under the II-level pollution level.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A wall-penetrating current transformer, comprising: primary winding, secondary winding and the pouring body of pouring outside primary winding and secondary winding, its characterized in that still includes: a voltage-equalizing cover and a shielding cover; wherein,
the voltage-equalizing cover is arranged at one terminal of the primary winding;
the shield is disposed over the other terminal of the primary winding.
2. The through-the-wall current transformer of claim 1, further comprising: a pressure-equalizing plate is arranged on the upper surface of the plate,
the voltage equalizing plate is arranged at the other terminal of the primary winding.
3. The through-the-wall current transformer of claim 2, wherein said caul plate is cast within said casting.
4. The through-the-wall current transformer of claim 1, further comprising: and one wiring terminal of the primary winding is arranged in the contact box and used as a static contact in the switch cabinet.
5. The through-the-wall current transformer of claim 4, wherein a cover umbrella is provided on a terminal of the primary winding disposed in the contact box as a stationary contact.
6. The through-the-wall current transformer of claim 1, wherein the voltage-sharing enclosure and the shielding enclosure are both cast within the casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220132797 CN202616018U (en) | 2012-03-30 | 2012-03-30 | Through-wall current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220132797 CN202616018U (en) | 2012-03-30 | 2012-03-30 | Through-wall current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616018U true CN202616018U (en) | 2012-12-19 |
Family
ID=47349693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220132797 Expired - Fee Related CN202616018U (en) | 2012-03-30 | 2012-03-30 | Through-wall current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202616018U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950824A (en) * | 2019-04-24 | 2019-06-28 | 江苏洛云电力科技有限公司 | Solid insulation cabinet with grading shield |
| CN110299673A (en) * | 2019-07-12 | 2019-10-01 | 江苏华鹏变压器有限公司 | High-tension switch cabinet |
-
2012
- 2012-03-30 CN CN 201220132797 patent/CN202616018U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950824A (en) * | 2019-04-24 | 2019-06-28 | 江苏洛云电力科技有限公司 | Solid insulation cabinet with grading shield |
| CN110299673A (en) * | 2019-07-12 | 2019-10-01 | 江苏华鹏变压器有限公司 | High-tension switch cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 116200, Liaoning, Dalian province Pulandian City Taiping Office Home Industrial Zone northwest Tun Street 109 Patentee after: Sino Canton electric appliance Limited by Share Ltd Address before: 116200, Liaoning, Dalian province Pulandian City Taiping Office Home Industrial Zone northwest Tun Street 109 Patentee before: Dalian Zhongguang Instrument Transformer Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20200330 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |