CN203396843U - Selective electric leakage protector employing additional direct current - Google Patents
Selective electric leakage protector employing additional direct current Download PDFInfo
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- CN203396843U CN203396843U CN201320214530.7U CN201320214530U CN203396843U CN 203396843 U CN203396843 U CN 203396843U CN 201320214530 U CN201320214530 U CN 201320214530U CN 203396843 U CN203396843 U CN 203396843U
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- direct current
- power grid
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Abstract
A selective electric leakage protector employing additional direct current comprises multiple additional direct current sources and multiple power grid detection insulated resistors, which are mounted on an identical power grid; and an insulated resistor control device of one additional direct current source mounted on a bus of the identical power grid. The insulated resistor control device comprises an automatic identification circuit, a detection control circuit, and a Hall sensor which are connected in series. According to the utility model, the additional direct current sources can be injected at multiple points in different places in the identical power grid for multiple-point monitoring of the insulating resistors of the power grid, and the automatic identification of faulted branches and selective actions are realized. The utility model discloses a new method jointly employing the automatic identification circuit and the detection control circuit and detecting the direct current insulated resistors of a branch with respect to the ground through the Hall sensor by virtue of injecting direct current signals into the power grid. According to the new method, the identical power grid can have one ore multiple direct current injection points and detection points, and the detection range and precision of the insulating resistance are 2 kilohms to 300 kilohms, +/-3%. The protector can be directly applied to an IT power grid which is 1140 V or below and has an ungrounded neutral point. Detected numerical values are not influenced by the magnitude of the capacitance of the power grid with respect to the ground.
Description
Technical field
The utility model relates to a kind of earth leakage protective device, especially a kind of selective earth leakage protective device of additional direct current.
Background technology
At present, additional once-through principle, for insulation monitoring and the earth leakage protection of isolated neutral electrical network, generally all adopts the method for direct-detection grid power leakage stream.This has just determined that same electrical network can only have a decanting point and check point.DC source is injected and is detected and completed by same table apparatus.This is because inject DC source to an electrical network and can mutually form load when two and above while.Detect data and lose authenticity.Therefore the range of application of additional once-through principle and the dirigibility of application have been limited.Can not realize the selectivity action to each branch trouble.
Utility model content
The utility model provides a kind of selective earth leakage protective device of realizing the additional direct current of selective action.
Realize the selective earth leakage protective device of a kind of additional direct current of the utility model object; comprise a plurality of additional DC source that is arranged on same electrical network and the insulation resistance of a plurality of detection of grid, be arranged on the insulation resistance control device of an additional DC source on same electrical network bus.
Described insulation resistance control device comprises automatic identification circuit, detection control circuit and the Hall element being cascaded.
The beneficial effect of the selective earth leakage protective device of a kind of additional direct current of the present utility model is as follows:
The selective earth leakage protective device of a kind of additional direct current of the present utility model, can be at same electrical network, and different location multiple spot injects additional DC source, and multiple spot is monitored the insulation resistance of electrical network, and realizes the automatic identification of fault branch, selective action.This patent forms with automatic identification circuit and testing circuit are common, by injecting direct current signal to electrical network, by the Hall element detection branch new method of D.C. isolation resistance over the ground.New method can have one or several direct current decanting point and check points on same electrical network, detects scope and precision 2K Ω～300K Ω of insulation resistance, ± 3%.Can directly apply to 1140V and following isolated neutral IT electrical network, detect numerical value and be not subject to the large and small impact of power-to-ground capacitance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the selective earth leakage protective device of a kind of additional direct current of the present utility model.
Embodiment
As described in Figure 1; the selective earth leakage protective device of a kind of additional direct current described in the utility model; comprise a plurality of additional DC source 5 that is arranged on same electrical network and the insulation resistance 4 of a plurality of detection of grid, be arranged on additional DC source 5 and insulation resistance control device on same electrical network bus.
Described insulation resistance control device comprises automatic identification circuit 1, detection control circuit 2 and the Hall element 3 being cascaded.
The beneficial effect of the selective earth leakage protective device of a kind of additional direct current of the present utility model is as follows:
The selective earth leakage protective device of a kind of additional direct current of the present utility model, can be at same electrical network, and different location multiple spot injects additional DC source, and multiple spot is monitored the insulation resistance of electrical network, and realizes the automatic identification of fault branch, selective action.This patent forms with automatic identification circuit and testing circuit are common, by injecting direct current signal to electrical network, by the Hall element detection branch new method of D.C. isolation resistance over the ground.New method can have one or several direct current decanting point and check points on same electrical network, detects scope and precision 2K Ω～300K Ω of insulation resistance, ± 3%.Can directly apply to 1140V and following isolated neutral IT electrical network, detect numerical value and be not subject to the large and small impact of power-to-ground capacitance.
Embodiment recited above is described preferred implementation of the present utility model; not scope of the present utility model is limited; design under spiritual prerequisite not departing from the utility model; various distortion and improvement that the common engineering technical personnel in this area make technical solutions of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (2)
1. the selective earth leakage protective device of an additional direct current; it is characterized in that; comprise a plurality of additional DC source that is arranged on same electrical network and the insulation resistance of a plurality of detection of grid, be arranged on the insulation resistance control device of an additional DC source on same electrical network bus.
2. the selective earth leakage protective device of a kind of additional direct current according to claim 1, is characterized in that, described insulation resistance control device comprises automatic identification circuit, detection control circuit and the Hall element being cascaded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320214530.7U CN203396843U (en) | 2013-04-25 | 2013-04-25 | Selective electric leakage protector employing additional direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320214530.7U CN203396843U (en) | 2013-04-25 | 2013-04-25 | Selective electric leakage protector employing additional direct current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203396843U true CN203396843U (en) | 2014-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320214530.7U Expired - Fee Related CN203396843U (en) | 2013-04-25 | 2013-04-25 | Selective electric leakage protector employing additional direct current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203396843U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053946A (en) * | 2016-05-18 | 2016-10-26 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic direct-current insulating monitoring method and device and photovoltaic system |
| CN108649538A (en) * | 2018-04-23 | 2018-10-12 | 北京和利时智能技术有限公司 | A kind of method of low-voltage leakage inverse time-lag protection |
| CN109633357A (en) * | 2019-01-10 | 2019-04-16 | 许继电源有限公司 | More busbar grounding insulated monitoring methods and monitoring device in triple bus-bar |
-
2013
- 2013-04-25 CN CN201320214530.7U patent/CN203396843U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053946A (en) * | 2016-05-18 | 2016-10-26 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic direct-current insulating monitoring method and device and photovoltaic system |
| CN106053946B (en) * | 2016-05-18 | 2019-02-05 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic DC insulated monitoring method, device and a kind of photovoltaic system |
| CN108649538A (en) * | 2018-04-23 | 2018-10-12 | 北京和利时智能技术有限公司 | A kind of method of low-voltage leakage inverse time-lag protection |
| CN109633357A (en) * | 2019-01-10 | 2019-04-16 | 许继电源有限公司 | More busbar grounding insulated monitoring methods and monitoring device in triple bus-bar |
| CN109633357B (en) * | 2019-01-10 | 2021-06-18 | 许继电源有限公司 | Method and device for monitoring grounding insulation of multiple buses in three buses |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20170425 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |