CN2456297Y - Device for preventing break-off current mutual inductor of switch on post - Google Patents
Device for preventing break-off current mutual inductor of switch on post Download PDFInfo
- Publication number
- CN2456297Y CN2456297Y CN 00261338 CN00261338U CN2456297Y CN 2456297 Y CN2456297 Y CN 2456297Y CN 00261338 CN00261338 CN 00261338 CN 00261338 U CN00261338 U CN 00261338U CN 2456297 Y CN2456297 Y CN 2456297Y
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- CN
- China
- Prior art keywords
- switch
- current transformer
- mutual inductor
- current mutual
- shorting
- 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 - Lifetime
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Abstract
The utility model relates to a device for preventing break-off current mutual inductor of switches on posts, a shorting switch 5 of a current mutual inductor 1 is positioned in a switch body 2 on a post; a button of the shorting switch 5 is exposed out of the switch box. Current mutual inductor is connected in parallel with two ends of a normally closed head of the shorting switch, and two ends of the current mutual inductor are respectively connected in series with one resistor 4. The utility model has the advantages that the structure is simple, the utility model can thoroughly eradicate the break-off phenomenon of the current mutual inductor which is caused by that a switch on the post and terminals of feed lines are separately installed, and the safety is high.
Description
The utility model relates to a kind of device that can solve on-pole switch current transformer open circuit, belongs to parts in the electrical power distribution automatization system.
In electrical power distribution automatization system, an important detection parameter is a line current, mainly is to detect to measure electric current and protective current.Normally use the interior current transformer (CT) of on-pole switch as transducer, send into the line feed terminals unit by cable connection and measure, handle.But in the practice of construction process, because on-pole switch and line feed terminals unit are not always installed simultaneously, in case on-pole switch is installed and is come into operation in advance, be not connected with the input element (having extremely low input impedance characteristic) of line feed terminals unit because have, will make the Current Transformer Secondary side of on-pole switch high voltage occur, very easily the fitting operation personnel are damaged, the on-pole switch internal components is suffered damage, normal use after influencing the entire circuit system and installing, construction causes inconvenience to secondary.If the auxiliary plug of adapted short circuit current transformer on the cable socket of on-pole switch, though in on-pole switch and the phenomenon that can not occur on-pole switch current transformer open circuit before the line feed terminals unit is not connected, but when needs connect and compose system, must remove auxiliary plug before connecting the interconnecting cable of pegging graft in advance, and then finish the connection of cable plug, therefore still there is the instantaneous open circuit problem of on-pole switch current transformer.
The purpose of this utility model is exactly the deficiency that exists in the above-mentioned background technology for solving, and can thoroughly eradicate on-pole switch and the device of the current transformer open circuit phenomenon of bringing is installed in the line feed terminals unit because of substep and provide a kind of.
The purpose of this utility model realizes by following technical solution:
The device of this solution on-pole switch current transformer open circuit mainly is the shorting switch that has current transformer in the on-pole switch box, and the button of this shorting switch exposes outside the switch enclosure.
Accompanying drawing is a structural representation of the present utility model.
As shown in drawings, the utility model mainly is the shorting switch 5 at on-pole switch casing 2 inner bottom parts installing current transformer 1, wherein, current transformer 1 except that original normal and receive cable 3 can be with the line feed terminals unit be connected, the two ends of each instrument transformer 1 also connect a resistance 4 separately and link between a pair of closing contact of shorting switch 5.The button 6 of shorting switch 5 exposes outside the switch casing 2.The said shorting switch 4 of this example is five groups of switches that move simultaneously; be respectively applied for short circuit CTA, CTC, CTa, CTb, five current transformers 1 of CTc; it is used that wherein CTA, CTC are used for the measurement circuitry protective current; it is used that CTa, CTb and CTc are used for the measurement circuitry operating current, and another contact of five groups of switches is an idle contact 7.Said shorting switch 5 is made of single-pole double-throw switch (SPDT) or double-point double-throw switch.When less demanding, also can only adopt two pairs of switches to certainty of measurement, as the usefulness of the short circuit of CTA, CTC.
Before on-pole switch was received circuit, elder generation, just high voltage can not occurred at the two ends of current transformer 1, thereby can solve the open circuit problem of on-pole switch current transformer 1, to guarantee fitting operation personnel's safety current transformer 1 short circuit by shorting switch 5.If afterwards on-pole switch by cable be connected with the line feed terminals unit finish after, available insulating rod pushes button 6, and shorting switch is beaten to idle contact 7, makes current transformer 1 change vacant state into from original short circuit state, can enter the surveying work state.Suitably select the resistance of resistance 4, make the impedance matching of itself and interconnecting cable, help the parameter correction of switching current instrument transformer 1, to guarantee the certainty of measurement of current parameter.More in short-term, also can omit this resistance in interconnecting cable length.In order to ensure the reliability of device, also aforesaid one group of single-pole double-throw switch (SPDT) can be replaced by one group of double-point double-throw switch.
The utility model adopts simple but the design particular structure, can thoroughly eradicate because of on-pole switch and line feed terminals unit the current transformer open circuit phenomenon that causes being installed step by step, and it is simple to operate, safe, be beneficial to the maintenance debugging, and improved the safe construction quality, for installing and measure and have laid a good foundation with supporting line feed terminals unit.
Claims (3)
1, a kind of device that solves on-pole switch current transformer open circuit, the two ends of current transformer (1) and cable (3) join, it is characterized in that having in the switch casing (2) shorting switch (5) of current transformer (1), the button of this shorting switch (6) exposes outside the switch casing (2).
2, solve the device of on-pole switch current transformer open circuit according to claim 1, it is characterized in that said current transformer (1) is connected in parallel on normally closed two ends of shorting switch (5).
3, solve the device of on-pole switch current transformer open circuit according to claim 1, it is characterized in that said shorting switch (5) is one group of single-pole double-throw switch (SPDT) or double-point double-throw switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00261338 CN2456297Y (en) | 2000-12-01 | 2000-12-01 | Device for preventing break-off current mutual inductor of switch on post |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00261338 CN2456297Y (en) | 2000-12-01 | 2000-12-01 | Device for preventing break-off current mutual inductor of switch on post |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2456297Y true CN2456297Y (en) | 2001-10-24 |
Family
ID=33616868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00261338 Expired - Lifetime CN2456297Y (en) | 2000-12-01 | 2000-12-01 | Device for preventing break-off current mutual inductor of switch on post |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2456297Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898006A (en) * | 2014-03-04 | 2015-09-09 | 国家电网公司 | Current transformer secondary side open circuit anticipation device |
-
2000
- 2000-12-01 CN CN 00261338 patent/CN2456297Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898006A (en) * | 2014-03-04 | 2015-09-09 | 国家电网公司 | Current transformer secondary side open circuit anticipation 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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20101201 Granted publication date: 20011024 |