CN112362943B - Residual voltage detection circuit and detection method - Google Patents
Residual voltage detection circuit and detection method Download PDFInfo
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- CN112362943B CN112362943B CN202011165146.3A CN202011165146A CN112362943B CN 112362943 B CN112362943 B CN 112362943B CN 202011165146 A CN202011165146 A CN 202011165146A CN 112362943 B CN112362943 B CN 112362943B
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- residual voltage
- voltage detection
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- relay
- residual
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- 238000001514 detection method Methods 0.000 title claims abstract description 148
- 238000001914 filtration Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention relates to a residual voltage detection circuit and a detection method, wherein the residual voltage detection circuit can enable a protection device to generate a kept locking signal when an instantaneous voltage or an instantaneous residual voltage appears on a switching circuit after a terminal of the protection device loses power, and the terminal of the protection device generates a closing locking signal after the terminal of the protection device detects the kept locking signal after the terminal of the protection device is electrified to run, so that the switching-on of a switch to a fault circuit is successfully avoided, and the occurrence of circuit faults is avoided. The residual voltage detection circuit provided by the invention has the advantages of simple structure, low cost, capability of detecting multiple paths of feeder circuits simultaneously, high detection efficiency and great help for saving the internal space and the production cost of the distribution network feeder terminal.
Description
Technical Field
The invention relates to the technical field of residual voltage detection in the field of distribution networks, in particular to a residual voltage detection circuit and a residual voltage detection method.
Background
The national power grid company secondary fusion is a switch on loop column and the network access professional detection outline of the ring main unit has the following requirements: when the terminal is powered off and has no backup power supply, the voltage on the line is more than or equal to 50 percent Un, and when the duration time is more than or equal to 80ms, the column load switch can complete reverse locking.
In the prior art, a scheme of the residual voltage detection circuit generally adopts voltage transformers and other means to detect residual voltage, has large volume, is inconvenient to use in a device with extremely limited space such as a distribution network feeder terminal, and has high cost. In another scheme of the residual voltage detection circuit, a pair of relays is used for detection, so that the condition that the terminal has multiple paths of voltages to be detected cannot be met.
Disclosure of Invention
Based on the above situation in the prior art, the purpose of the present invention is to provide a residual voltage detection circuit and a detection method, where the residual voltage detection circuit can enable the protection device to generate a hold blocking signal when an instantaneous voltage or an instantaneous residual voltage occurs in a switching circuit after a terminal of the protection device loses power, and enable the terminal of the protection device to generate a closing blocking signal after the terminal of the protection device detects the hold blocking signal after the terminal of the protection device gets power to run, so as to successfully avoid switching on a fault circuit by the switch, and avoid occurrence of a circuit fault again.
To achieve the above object, according to one aspect of the present invention, there is provided a residual voltage detection circuit comprising: the residual voltage detection module, the protection device processor module and the power supply module; wherein,
the residual voltage detection module outputs residual voltage detection signals and is placed in a detection stopping state when external residual voltages on all the power supply lines are detected;
the power supply module is used for controlling the residual voltage detection module to be in a stop detection state when the protection device normally operates;
the protection device processor module generates a closing locking signal according to the residual voltage detection signal when the protection device normally operates so as to prevent a switch from closing to a fault line; and
and after the normal operation of the protection device is completed, sending a reset signal FG to the residual voltage detection module so that the residual voltage detection module is in a residual voltage detection state.
Further, the residual voltage detection module comprises a first relay RL1, and when the external residual voltage on the first power supply line is detected, the first relay RL1 acts, so that the residual voltage detection module outputs a residual voltage detection signal CY1.
Further, the residual voltage detection module further comprises a third relay RL3, and when the external residual voltage on the second power supply line is detected, the third relay RL3 acts, so that the residual voltage detection module outputs a residual voltage detection signal CY2.
Further, the residual voltage detection module further comprises a rectifying and filtering circuit, the rectifying and filtering circuit carries out rectifying and filtering on external residual voltages on all feeder lines, and the signals after rectifying and filtering drive the first relay RL1 and/or the third relay RL3.
Furthermore, the residual voltage detection module further comprises a voltage dividing circuit, and the voltage dividing circuit divides the external residual voltage on each power supply line and inputs the external residual voltage to the rectifying and filtering circuit.
Further, the residual voltage detection module further includes a first photoelectric coupler OP1 and/or a second photoelectric coupler OP2, and the first photoelectric coupler OP1 and/or the second photoelectric coupler OP2 control the first relay RL1 and/or the third relay RL3 to act according to the reset signal FG, so that the residual voltage detection module is placed in a residual voltage detection state.
Further, the power supply module comprises a protection device power supply and a second relay RL2, and when the protection device power supply operates normally, the second relay RL2 is driven to act, so that the residual voltage detection module is in a stop detection state.
Further, the first relay RL1 and the third relay RL3 each include a relay with two pairs of contacts and a magnetic latching.
According to another aspect of the present invention, there is provided a residual pressure detection method including the steps of:
when the protective device loses power, residual voltage detection is carried out on the feed line;
outputting a residual voltage detection signal when the external residual voltage on each feeder line is detected, and entering a stop detection state;
when the protection device normally operates, the switch is controlled to be switched on according to the residual voltage detection signal so as to avoid a fault line;
after the normal operation of the protection device is completed, a reset signal FG is sent out, and the residual voltage detection state is entered.
Further, the method further comprises the steps of:
and when the protection device operates normally, entering a stop detection state.
In summary, the present invention provides a residual voltage detection circuit and a detection method, where the residual voltage detection circuit can enable a protection device to generate a hold blocking signal when an instantaneous voltage or an instantaneous residual voltage occurs in a switching circuit after a protection device terminal loses power, and enable the protection device terminal to generate a closing blocking signal after detecting the hold blocking signal after the protection device terminal gets electric operation, so as to successfully avoid switching on a fault circuit and avoid occurrence of a circuit fault again. The residual voltage detection circuit provided by the invention has the advantages of simple structure, low cost, capability of detecting multiple paths of feeder circuits simultaneously, high detection efficiency and great help for saving the internal space and the production cost of the distribution network feeder terminal.
Drawings
FIG. 1 is a schematic diagram of a residual voltage detection circuit according to the present invention;
fig. 2 is a circuit diagram of a residual voltage detection circuit according to a first embodiment of the present invention;
fig. 3 is a circuit diagram of a residual voltage detection circuit according to a second embodiment of the present invention;
fig. 4 is a flow chart of the residual pressure detection method of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The technical scheme of the invention is described in detail below with reference to the prior art and the attached drawings. The schematic diagram of the residual voltage detection circuit is shown in fig. 1. When the instantaneous voltage or the instantaneous residual voltage appears on the switch circuit after the protection device loses power, a residual voltage detection module is provided for detecting the residual voltage on the power supply line. When the external residual voltage on the feeder line is detected, the residual voltage detection module outputs a residual voltage detection signal CY to the protection device processor, and the protection device processor generates a closing and locking signal to avoid the closing of the switch to the fault line. After the normal operation of the protection device is completed, the protection device processor outputs a reset signal FG to the residual voltage detection module, so that the residual voltage detection module is restored to a residual voltage detection state. Meanwhile, the power supply of the protection device can also generate a control signal, and the residual voltage detection module is controlled to be in a stop detection state when the protection device operates normally.
A specific circuit configuration of the residual voltage detection circuit according to the first embodiment of the present invention is shown in fig. 2. The residual voltage detection circuit shown in this embodiment can be used for detection of a single-circuit feeder circuit. The residual voltage detection module comprises resistors R1-R3, a rectifying and filtering circuit, a relay RL1 and a photoelectric coupler OP1. Wherein, relay RL1 can be selected to use and have two pairs of contacts and magnetic latching's relay. The resistor R1 is connected to the feeder line, and inputs the external residual voltage on the feeder line into the rectifying and filtering circuit to carry out rectifying and filtering, and the signal after rectifying and filtering drives the relay RL 1. When an external residual voltage input is detected, the contact RL1C of the driving relay RL1 is closed, the output residual voltage detection signal CY1 is changed from a low level to a high level, and simultaneously the other pair of normally closed contacts RL1D of the relay RL1 is opened, so that the residual voltage detection circuit is placed in a stop detection state and no longer works. When the protection device supplies power normally, a fault is found on the line through a signal CY1, and the situation that the switch is switched on to the fault line is avoided. After the normal operation of the protection device is finished, the protection device controller can send a reset signal FG, and the reset signal FG is input to the photoelectric coupler OP1, so that the relay contact RL1B at the output end of the photoelectric coupler OP1 is reset, and the residual voltage detection module is restored to a residual voltage detection state. The residual voltage detection module further comprises a power supply module, the power supply module comprises a protection device power supply and a relay RL2, a normally closed contact RL2C of the relay RL2 is connected between the feed line and the rectifying and filtering circuit, the protection device power supply drives the second relay RL2 to act when the protection device normally operates, and the normally closed contact RL2C is utilized to ensure that the residual voltage collection circuit does not detect residual voltage when the device normally operates.
According to a second embodiment of the present invention, there is provided a residual voltage detection circuit, the specific circuit configuration of which is shown in fig. 3. Compared with the residual voltage detection circuit provided by the first embodiment, the residual voltage detection module provided by the embodiment can be used for residual voltage detection of the two-way feeder circuit. As shown in fig. 3, a set of a relay RL3 and a photo coupler OP2, and corresponding rectifying and filtering circuits and resistors R6 to R8 are added on the basis of the first embodiment. The resistor R6 is connected to the other feeder line, and inputs the external residual voltage on the feeder line into the rectifying and filtering circuit to carry out rectifying and filtering, and the signal after rectifying and filtering drives the relay RL3. When an external residual voltage input is detected, the contact RL3C of the driving relay RL3 is closed, the output residual voltage detection signal CY2 is changed from a low level to a high level, and simultaneously the other pair of normally closed contacts RL3D of the relay RL3 is opened, so that the residual voltage detection circuit is placed in a stop detection state and no longer works. When the protection device supplies power normally, a fault is found on the line through a signal CY2, and the situation that the switch is switched on to the fault line is avoided. After the normal operation of the protection device is finished, the protection device controller can send a reset signal FG, and the reset signal FG is input to the photoelectric coupler OP2, so that the relay contact RL3B at the output end of the photoelectric coupler OP2 is reset, and the residual voltage detection module is restored to a residual voltage detection state. By arranging two paths of detection circuits in the residual voltage detection module, the two paths of feed circuits can be detected simultaneously, and the detection efficiency is improved. When the residual voltage detection circuit of the present embodiment is employed, the arrangement of the elements in the power supply module in the residual voltage detection circuit is the same as that in the first embodiment. On this basis, the man skilled in the art can also arrange the residual voltage detection circuit of the multi-feeder circuit according to the solution provided in this second embodiment, in the face of the detection need with the multi-feeder circuit.
According to a third embodiment of the present invention, there is provided a residual pressure detection method, and a flowchart of an implementation of the method is shown in fig. 4. The method comprises the following steps:
when the protective device loses power, residual voltage detection is carried out on the feed line;
outputting a residual voltage detection signal when the external residual voltage on the feeder line is detected, and entering a stop detection state;
when the protection device normally operates, the switch is controlled to be switched on according to the residual voltage detection signal so as to avoid a fault line;
after the normal operation of the protection device is completed, a reset signal FG is sent out, and the residual voltage detection state is entered.
Further, the method further comprises the steps of:
and when the protection device operates normally, entering a stop detection state.
The steps of the above method are implemented by the modules in the residual voltage detection circuit provided by the first embodiment and the second embodiment of the present invention.
In summary, the present invention relates to a residual voltage detection circuit and a detection method, where the residual voltage detection circuit can enable a protection device to generate a hold blocking signal when an instantaneous voltage or an instantaneous residual voltage appears on a switching line after a terminal loses power, and enable the terminal to generate a closing blocking signal after detecting the hold blocking signal after the terminal is powered on, so as to successfully avoid switching on a fault line by the switch, and avoid occurrence of a line fault again. The residual voltage detection circuit provided by the invention has the advantages of simple structure, low cost, capability of detecting multiple paths of feeder circuits simultaneously, high detection efficiency and great help for saving the internal space and the production cost of the distribution network feeder terminal.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (9)
1. A residual voltage detection circuit, comprising: the residual voltage detection module, the protection device processor module and the power supply module; wherein,
the residual voltage detection module outputs residual voltage detection signals and is placed in a detection stopping state when external residual voltages on all the power supply lines are detected; the residual voltage detection module comprises a first relay (RL 1), when external residual voltage on a first feeder line is detected, one pair of contacts (RL 1C) of the first relay (RL 1) is closed, an output residual voltage detection signal CY1 is changed from low level to high level, and the other pair of normally closed contacts (RL 1D) of the relay (RL 1) is opened, so that the residual voltage detection circuit is placed in a stop detection state and does not work any more; the first relay (RL 1) comprises a relay with two pairs of contacts and a magnetic hold;
the power supply module is used for controlling the residual voltage detection module to be in a stop detection state when the protection device normally operates;
the protection device processor module generates a closing locking signal according to the residual voltage detection signal when the protection device normally operates so as to prevent a switch from closing to a fault line; and
and after the normal operation of the protection device is completed, sending a reset signal FG to the residual voltage detection module so that the residual voltage detection module is in a residual voltage detection state.
2. The residual voltage detection circuit according to claim 1, characterized in that the residual voltage detection module further comprises a third relay (RL 3), which third relay (RL 3) acts upon detection of an external residual voltage on the second feeder line, such that the residual voltage detection module outputs a residual voltage detection signal CY2.
3. Residual voltage detection circuit according to claim 2, characterized in that the residual voltage detection module further comprises a rectifying and filtering circuit which rectifies and filters the external residual voltage on the respective feeder lines, the rectified and filtered signal driving the first relay (RL 1) and/or the third relay (RL 3).
4. The residual voltage detection circuit according to claim 3, wherein the residual voltage detection module further comprises a voltage dividing circuit which divides an external residual voltage on each feeder line and inputs the divided voltage to the rectifying filter circuit.
5. Residual voltage detection circuit according to claim 4, characterized in that the residual voltage detection module further comprises a first photo coupler (OP 1) and/or a second photo coupler (OP 2), the first photo coupler (OP 1) and/or the second photo coupler (OP 2) controlling the first relay (RL 1) and/or the third relay (RL 3) to act according to the reset signal FG, so that the residual voltage detection module is placed in a residual voltage detection state.
6. The residual voltage detection circuit according to claim 5, characterized in that the power supply module comprises a protection device power supply and a second relay (RL 2), the protection device power supply driving the second relay (RL 2) to act when the protection device is operating normally, so that the residual voltage detection module is put in a stopped detection state.
7. Residual voltage detection circuit according to claim 6, characterized in that the third relay (RL 3) comprises a relay with two pairs of contacts and a magnetic hold.
8. A residual voltage detection method for detecting by using the detection circuit according to any one of claims 1 to 7, comprising the steps of:
when the protective device loses power, residual voltage detection is carried out on the feed line;
outputting a residual voltage detection signal when the external residual voltage on each feeder line is detected, and entering a stop detection state;
when the protection device normally operates, the switch is controlled to be switched on according to the residual voltage detection signal so as to avoid a fault line;
after the normal operation of the protection device is completed, a reset signal FG is sent out, and the residual voltage detection state is entered.
9. The residual pressure detection method according to claim 8, further comprising the step of:
and when the protection device operates normally, entering a stop detection state.
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| CN113721140A (en) * | 2021-08-10 | 2021-11-30 | 北京三清互联科技股份有限公司 | Instantaneous residual voltage detection module and method for power distribution network |
| CN115201548B (en) * | 2022-09-14 | 2022-11-29 | 石家庄科林电气股份有限公司 | Residual voltage detection recording device and method for power distribution terminal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012215558A (en) * | 2011-03-30 | 2012-11-08 | Denso Corp | Voltage detector and coupling circuit |
| CN204789861U (en) * | 2015-07-30 | 2015-11-18 | 广东电网有限责任公司肇庆供电局 | Detection and positioner of circuit ground state |
| CN106324384A (en) * | 2016-08-03 | 2017-01-11 | 许继集团有限公司 | Multi-loop-circuit safety testing system and multipath switching device |
| CN109088474A (en) * | 2017-06-13 | 2018-12-25 | 许继集团有限公司 | Prevent the quick power switching method and system of non-Switching Synchronization |
| CN109687407A (en) * | 2018-12-17 | 2019-04-26 | 长园电力技术有限公司 | The reversed blocking device and implementation method of one or two fusion serial column load switch |
| CN109842211A (en) * | 2019-03-04 | 2019-06-04 | 石家庄科林电气股份有限公司 | A kind of residual voltage detection method of residual voltage logging modle and automatic circuit formula line feed terminals |
| CN110635459A (en) * | 2019-10-17 | 2019-12-31 | 广西电网有限责任公司南宁供电局 | Double-path check residual voltage locking method and circuit |
-
2020
- 2020-10-27 CN CN202011165146.3A patent/CN112362943B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012215558A (en) * | 2011-03-30 | 2012-11-08 | Denso Corp | Voltage detector and coupling circuit |
| CN204789861U (en) * | 2015-07-30 | 2015-11-18 | 广东电网有限责任公司肇庆供电局 | Detection and positioner of circuit ground state |
| CN106324384A (en) * | 2016-08-03 | 2017-01-11 | 许继集团有限公司 | Multi-loop-circuit safety testing system and multipath switching device |
| CN109088474A (en) * | 2017-06-13 | 2018-12-25 | 许继集团有限公司 | Prevent the quick power switching method and system of non-Switching Synchronization |
| CN109687407A (en) * | 2018-12-17 | 2019-04-26 | 长园电力技术有限公司 | The reversed blocking device and implementation method of one or two fusion serial column load switch |
| CN109842211A (en) * | 2019-03-04 | 2019-06-04 | 石家庄科林电气股份有限公司 | A kind of residual voltage detection method of residual voltage logging modle and automatic circuit formula line feed terminals |
| CN110635459A (en) * | 2019-10-17 | 2019-12-31 | 广西电网有限责任公司南宁供电局 | Double-path check residual voltage locking method and circuit |
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