CN112398084A - Electric leakage protection system - Google Patents
Electric leakage protection system Download PDFInfo
- Publication number
- CN112398084A CN112398084A CN201910746442.3A CN201910746442A CN112398084A CN 112398084 A CN112398084 A CN 112398084A CN 201910746442 A CN201910746442 A CN 201910746442A CN 112398084 A CN112398084 A CN 112398084A
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- CN
- China
- Prior art keywords
- circuit breaker
- leakage
- characteristic
- leakage protection
- protection circuit
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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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
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Abstract
The invention provides an electric leakage protection system, which comprises a superior electric leakage protection circuit breaker and a subordinate electric leakage protection circuit breaker arranged at the lower end of the superior electric leakage protection circuit breaker; the lower-level leakage protection circuit breaker comprises a CPU controller, a function key and a characteristic leakage current circuit; when the lower-level leakage protection circuit breaker is subjected to leakage tripping, a function key is pressed, and then the lower-level leakage protection circuit breaker is switched on, the CPU controller controls a characteristic leakage current circuit to be conducted to generate characteristic leakage current; at the moment, the superior earth leakage protection circuit breaker detects the characteristic leakage current, and when the characteristic of the characteristic leakage current is consistent with the preset leakage current characteristic, the superior earth leakage protection circuit breaker reforms the leakage current protection strategy to enable the superior earth leakage protection circuit breaker not to trip. The invention has the advantages that: the problem of the user withdraw from the earth leakage protection function and carry out emergent power supply, lead to higher level earth leakage protection circuit breaker creepage tripping operation, cause the power failure area to enlarge, influence more user's power consumptions is solved.
Description
Technical Field
The invention belongs to the field of leakage protection circuit breakers, and particularly relates to a leakage protection control system.
Background
In a low-voltage power grid, when a user accesses the power grid, the leakage protection circuit breaker is usually used as an incoming line switch to prevent the user from being injured due to electric shock and protect the user, and the leakage protection circuit breaker can be used for indirect leakage protection at the front end.
However, after the earth leakage protection circuit breaker is installed, if a user has an earth leakage phenomenon, the user is difficult to find out the position of the earth leakage in a short time, so that emergency power supply cannot be performed on the premise of not influencing the use safety.
Therefore, in order to solve the above problems, an earth leakage protection circuit breaker having an earth leakage exit function is produced, that is: after the leakage protection function is quitted, the power supply can be carried out without tripping under the condition of leakage, and after the leakage problem is solved, the leakage protection function of the leakage protection circuit breaker is recovered.
However, after the above problems are solved, a new problem arises, and when a user withdraws the earth leakage protection function and performs emergency power supply, the upper earth leakage protection circuit breaker may be tripped by earth leakage, which may enlarge the power outage area and affect more electricity consumption of the user.
Therefore, the invention provides an electric leakage protection system, when a lower-level electric leakage protection circuit breaker is switched on under the condition of leakage current, the electric leakage protection system can automatically send characteristic leakage current for detection of an upper-level electric leakage protection circuit breaker so as to automatically adjust an electric leakage protection strategy, ensure that the upper-level electric leakage protection circuit breaker cannot trip, and avoid the power failure area from being enlarged.
Disclosure of Invention
In order to achieve the above object and solve the existing problems, the present invention discloses an earth leakage protection system, comprising a superior earth leakage protection circuit breaker and a subordinate earth leakage protection circuit breaker installed at the lower end thereof; the lower-level leakage protection circuit breaker comprises a CPU controller, a function key and a characteristic leakage current circuit; when the lower-level leakage protection circuit breaker is subjected to leakage tripping, a function key is pressed, and then the lower-level leakage protection circuit breaker is switched on, the CPU controller controls a characteristic leakage current circuit to be conducted to generate characteristic leakage current; at the moment, the superior earth leakage protection circuit breaker detects the characteristic leakage current, and when the characteristic of the characteristic leakage current is consistent with the preset leakage current characteristic, the superior earth leakage protection circuit breaker reforms the leakage current protection strategy to enable the superior earth leakage protection circuit breaker not to trip.
One end of a characteristic leakage current circuit of the lower-level leakage protection circuit breaker is connected with a live wire, the other end of the characteristic leakage current circuit is connected with a ground wire, a resistor and an electronic switch are connected in series in the circuit, a CPU controller controls the closing and closing time of the electronic switch, and the closing time is constant; the resistor in the characteristic leakage current circuit is a resistor with a fixed resistance value, so that the leakage current amplitude in the characteristic leakage current circuit is constant.
The electronic switch has constant closing time and constant current amplitude, so that the current generated by the characteristic leakage current circuit has a very clear characteristic, and the accurate extraction and judgment of the superior earth leakage protection circuit breaker are facilitated.
Drawings
FIG. 1: a system diagram of the invention;
FIG. 2: the invention discloses a schematic diagram of a subordinate leakage protection circuit breaker.
In the figure: 1. the high-level earth leakage circuit breaker, 2, the low-level earth leakage circuit breaker, 21, a CPU controller, 22, a function key, 23, a characteristic earth leakage circuit, 24, a current transformer, 25, a release, 26, a communication module, 231, a resistor, 232, an electronic switch and a ground wire, 233.
Detailed Description
Referring to fig. 1 and 2, the present invention provides an earth leakage protection system, which includes an upper earth leakage protection circuit breaker 1 and a lower earth leakage protection circuit breaker 2 installed at a lower end thereof;
the lower-level earth leakage protection circuit breaker 2 comprises a CPU controller 21, a function key 22 and a characteristic earth leakage circuit 23;
one end of the characteristic leakage current circuit 23 is connected with a live wire, the other end is connected with a ground wire 233, a resistor 231 and an electronic switch 232 are connected in series in the circuit, the CPU controller 21 controls the closing of the electronic switch 232 and the closing time, and the closing time is constant; the resistor 231 in the characteristic leakage current circuit 23 is a resistor having a fixed resistance value, so that the leakage current amplitude in the characteristic leakage current circuit 23 is constant.
When the lower earth leakage protection circuit breaker 22 is tripped due to earth leakage, the function key 22 is pressed, and then the lower earth leakage protection circuit breaker 2 is switched on, the CPU controller 21 controls the characteristic leakage current circuit 23 to be switched on to generate characteristic leakage current;
at this time, the superior earth leakage protection circuit breaker 1 detects the characteristic leakage current, and when the characteristic of the characteristic leakage current is consistent with the preset leakage current characteristic, the superior earth leakage protection circuit breaker 1 reforms the leakage current protection strategy to enable the superior earth leakage protection circuit breaker 1 not to trip.
The constant closing time and the constant current amplitude of the electronic switch 232 are to make the current generated by the characteristic leakage current circuit 23 have a very definite characteristic, which is helpful for accurate extraction and judgment of the superior earth leakage circuit breaker 1.
The subordinate leakage protection circuit breaker 2 further comprises a current transformer 24 and a release 25 which are connected with the CPU controller 21, the CPU controller 21 detects the characteristic leakage current through the current transformer 24 and judges whether the characteristic leakage current is successfully transmitted, if the characteristic leakage current is unsuccessfully transmitted, the CPU controller 21 controls the release 25 to act, so that the subordinate leakage protection circuit breaker 2 continues to trip, and the front end leakage protection circuit breaker is prevented from tripping.
The lower earth leakage circuit breaker 2 may further be equipped with a communication module 26, and the CPU controller 21 may receive a communication command to complete the transmission of the characteristic leakage current.
Finally, it is to be noted that: while the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood that the invention is not limited thereto, but is capable of numerous modifications and substitutions as will be apparent to those skilled in the art, all of which are deemed to fall within the scope of the appended claims.
Claims (5)
1. An earth leakage protection system comprises an upper earth leakage protection circuit breaker and a lower earth leakage protection circuit breaker arranged at the lower end of the upper earth leakage protection circuit breaker;
the lower-level leakage protection circuit breaker comprises a CPU controller, a function key and a characteristic leakage current circuit;
after the lower-level leakage protection circuit breaker is subjected to leakage tripping, pressing a function key, and switching on the lower-level leakage protection circuit breaker, controlling a characteristic leakage current circuit to be conducted by a CPU controller to generate characteristic leakage current;
the superior earth leakage protection circuit breaker detects characteristic leakage current, and when the characteristic of the characteristic leakage current is consistent with the preset leakage current characteristic, the superior earth leakage protection circuit breaker reforms a leakage current protection strategy to enable the superior earth leakage protection circuit breaker not to trip.
2. A leakage protection system according to claim 1, wherein the characteristic leakage current circuit of the lower stage leakage protection circuit breaker has one end connected to the live line and the other end connected to the ground line, and a resistor and an electronic switch are connected in series in the circuit, and the CPU controller controls the electronic switch to close and conduct the characteristic leakage current circuit.
3. A leakage protection system according to claim 2, wherein the CPU controller controls the time for which the electronic switch is closed, and the closing time is constant.
4. The leakage protection system according to claim 2, wherein the resistor in the leakage current circuit is a resistor with a fixed resistance value, so that the amplitude of the leakage current in the leakage current circuit is constant.
5. The leakage protection system of claim 1, wherein the lower stage leakage protection circuit breaker further comprises a current transformer and a release, and both are connected to the CPU controller, the CPU controller detects the characteristic leakage current through the current transformer, and determines whether the characteristic leakage current is successfully transmitted, and if the characteristic leakage current is not successfully transmitted, the CPU controller controls the release to operate, so that the lower stage leakage protection circuit breaker continues to trip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910746442.3A CN112398084A (en) | 2019-08-14 | 2019-08-14 | Electric leakage protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910746442.3A CN112398084A (en) | 2019-08-14 | 2019-08-14 | Electric leakage protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112398084A true CN112398084A (en) | 2021-02-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910746442.3A Pending CN112398084A (en) | 2019-08-14 | 2019-08-14 | Electric leakage protection system |
Country Status (1)
| Country | Link |
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| CN (1) | CN112398084A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123126A (en) * | 2021-11-22 | 2022-03-01 | 广东电网有限责任公司 | Leakage protection switch, leakage protection method and storage medium |
-
2019
- 2019-08-14 CN CN201910746442.3A patent/CN112398084A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123126A (en) * | 2021-11-22 | 2022-03-01 | 广东电网有限责任公司 | Leakage protection switch, leakage protection method and storage medium |
| CN114123126B (en) * | 2021-11-22 | 2024-06-11 | 广东电网有限责任公司 | Leakage protection switch, leakage protection method and storage medium |
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