CN2268981Y - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN2268981Y CN2268981Y CN 96246209 CN96246209U CN2268981Y CN 2268981 Y CN2268981 Y CN 2268981Y CN 96246209 CN96246209 CN 96246209 CN 96246209 U CN96246209 U CN 96246209U CN 2268981 Y CN2268981 Y CN 2268981Y
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- CN
- China
- Prior art keywords
- winding
- utility
- electric power
- model
- relay protection
- Prior art date
- 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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Abstract
The utility model discloses a current mutual inductor used for electric power systems. The utility model is technically characterized in that the number of relays of a secondary winding of an original current mutual inductor is increased from two to three to meet the perfect requirement of an electric power system; a measuring winding is provided with two iron cores which are mutually parallel; the same group measuring winding coil is wound on two mutually independent iron cores, which can reduce the error rate of measuring level and the security factor; when failures happen to the electric power system, the utility model can effectively prevent a metering device from being impacted.
Description
The utility model relates to a kind of current transformer that is applied in the electric power system.
Current transformer is relay protection of power system and measures indispensable device.Whether accurate measurement is directly connected to power supply department and user's interests.In order to improve measuring accuracy, the level that should improve measuring instrument is inferior, improve simultaneously the level time (error that is current transformer is little) of current transformer again, when electric power system is broken down, the level time high more (error rate is more little) of current transformer, its secondary current increases big more suddenly, and the instrument of measuring through instrument transformer is hit also very big.It would be desirable that like this current transformer error is little, when electric power system was broken down, the multiple that its secondary current increases will lack, and this point is weighed with safety coefficient.China's its error rate of estimated current instrument transformer is ± 0.5, and safety coefficient is FS15 (as a LCWB5-66 type current transformer).Because the measurement winding in its secondary winding of this kind current transformer is single core structure, want to reduce its error rate, increasing core section long-pending is the few error of theobromine, but safety coefficient is also strengthened, like this when electric power system is broken down, measuring instrument is hit also just big more, has a strong impact on metering instrument precision and useful life.In addition; the secondary winding of existing 66KV electric current electricity instrument transformer only comprises two used for relay protection windings; because electrical network constantly enlarges at present; claimed scheme is more perfect, and above-mentioned only have two used for relay protection windings obviously to be difficult to meet the demands, and the user often adopts the 110KV current transformer to substitute for this reason; its weak point is the cost height; unit type is many, and maintenance acknowledgment copy kind is also many, brings inconvenience to the user thus.
At the deficiency that above-mentioned prior art exists, the purpose of this utility model provides and a kind ofly both can reduce error rate, the current transformer that can reduce safety coefficient again, makes things convenient for the user to safeguard simultaneously.
The purpose of this utility model is achieved in that it includes expander, oil conservator, insulator, winding, secondary winding and a base, comprise two used for relay protection windings and a measurement winding in the secondary winding, it is characterized in that: on the basis of above-mentioned existing two used for relay protection windings, set up a used for relay protection winding again, promptly in secondary winding, comprise three used for relay protection windings; Measurement is provided with two mutual iron cores arranged side by side with winding, and same group measurement is wrapped on two separate iron cores with winding coil.
The utility model has the advantages that: utilize metering to improve excitatory characteristic with the double-iron core of winding, both can reduce exciting curent, reduce error rate, can reduce safety coefficient (FS＜10) again, make it when electric power system is broken down, to prevent that measuring instrument from being impacted, thereby improve the useful life of measuring instrument.Former two used for relay protection windings are increased to three, make it to satisfy the more perfect requirement of protecting electrical power system, and save customer investment and make things convenient for the user to safeguard.
Below in conjunction with accompanying drawing the utility model is explained.
Fig. 1 is the utility model structural representation.
Fig. 2 is the secondary winding structural representation.
Fig. 3 is the utility model electrical schematic diagram.
By accompanying drawing as can be known, the utility model mainly is made of expander 1, oil conservator 2, insulator 3, winding 4 (L1, L2), secondary winding 5 and a base 6.Wherein secondary winding 5 comprises insulating barrier 5-1, three used for relay protection winding 5-2 (2K1,2K2), 5-3 (3K1-3K2), 5-4 (4K1,4K2) and a measurement winding 5-5 (1K1-1K3).This measurement is wrapped on two mutual arranged side by side and separate iron core 5-6, the 5-7 with winding coil, and the number of turn that coil is twined on two iron cores does not wait, in the number of turn that twines on the iron core 5-6 more than the number of turn that on iron core 5-7, is twined.Measuring with the 1K2 in the winding is centre tap, and its effect is to enlarge electrorheological than scope, and 1K1,1K3 are the binding posts of full circle current ratio, and 1K1,1K2 are the binding posts of tap current ratio.
Claims (1)
1, a kind of current transformer that is applied in the electric power system, it includes expander, oil conservator, insulator, winding, secondary winding and a base, comprise two used for relay protection windings and a measurement winding in the secondary winding, it is characterized in that: on the basis of above-mentioned existing two used for relay protection windings, set up a used for relay protection winding again, promptly in secondary winding, comprise three used for relay protection windings; Measurement is provided with two mutual iron cores arranged side by side with winding, and same group measurement is wrapped on two separate iron cores with winding coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96246209 CN2268981Y (en) | 1996-12-30 | 1996-12-30 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96246209 CN2268981Y (en) | 1996-12-30 | 1996-12-30 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2268981Y true CN2268981Y (en) | 1997-11-26 |
Family
ID=33918974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96246209 Expired - Fee Related CN2268981Y (en) | 1996-12-30 | 1996-12-30 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2268981Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074344A (en) * | 2010-12-06 | 2011-05-25 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
| CN102360881A (en) * | 2011-10-25 | 2012-02-22 | 保定天威集团有限公司 | Electromagnetic voltage transformer |
| CN106683828A (en) * | 2016-11-16 | 2017-05-17 | 国网山东省电力公司龙口市供电公司 | Mutual inductor unit for power transformation |
-
1996
- 1996-12-30 CN CN 96246209 patent/CN2268981Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074344A (en) * | 2010-12-06 | 2011-05-25 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
| CN102360881A (en) * | 2011-10-25 | 2012-02-22 | 保定天威集团有限公司 | Electromagnetic voltage transformer |
| CN106683828A (en) * | 2016-11-16 | 2017-05-17 | 国网山东省电力公司龙口市供电公司 | Mutual inductor unit for power transformation |
| CN106683828B (en) * | 2016-11-16 | 2018-08-21 | 国网山东省电力公司龙口市供电公司 | A kind of power transformation mutual inductor group |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |