Method and system for detecting leakage protection function

Abstract

The invention provides a method and system for detecting an electric leakage protection function, and the method comprises the steps: a gateway carries out the periodic timing, issues an electric leakage self-detection instruction when the timing time reaches a preset value, and a circuit breaker generates an electric leakage current according to an electric leakage condition after receiving the electric leakage self-detection instruction, a circuit breaker judges opening operation after detecting leakage current, a leakage current threshold value is set in the circuit breaker, the circuit breaker carries out leakage self-inspection for two times under different leakage conditions, and the leakage conditions include that the leakage current is smaller than the leakage current threshold value, the leakage current is larger than the leakage current threshold value, and the leakage current is smaller than the leakage current threshold value. The leakage condition of the circuit breaker during the first self-inspection is that the leakage current is smaller than a leakage current threshold, and the leakage condition of the circuit breaker during the second self-inspection is that the leakage current is greater than the leakage current threshold; by setting different electric leakage conditions, the functions of the electric leakage protection system under different electric leakage conditions are detected, and the risk caused by the failure of the circuit breaker can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage protection, and particularly to a method and a system for detecting the leakage protection function. Background Art

[0002] Most of the existing leakage protection circuit breakers require users to manually press the test button to detect whether the leakage protection function is normal. However, due to reasons such as the installation location of the leakage protection circuit breaker or the user's awareness of use, the leakage self-check is often not carried out for a long time, and the leakage protection function fails without the user's knowledge, posing a great potential safety hazard.

[0003] The prior art CN108169611A realizes regular self-check operations by setting a self-check period to ensure the normal operation of the leakage protection function; CN211296163U realizes the leakage self-check function through different external trigger methods and the single-chip microcomputer inside the circuit breaker, which is more intelligent. However, neither of the above solutions considers how to perform reclosing after the circuit breaker's leakage self-check is successful, nor does it perform current leakage judgment under various conditions. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and a system for detecting the leakage protection function to solve at least the above problems.

[0005] The technical solution adopted by the present invention is as follows:

[0006] In the first aspect, an embodiment of the present application provides a method for detecting the leakage protection function, and the method includes: the gateway performs periodic timing, and when the timing time reaches a predetermined value, it issues a leakage self-check instruction. After receiving the leakage self-check instruction, the circuit breaker generates a leakage current according to the leakage conditions. The circuit breaker performs two leakage self-checks under different leakage conditions, and makes a judgment on the tripping operation when the circuit breaker detects a leakage current.

[0007] A leakage current threshold is set inside the circuit breaker, and the leakage conditions include that the leakage current is less than the leakage current threshold and the leakage current is greater than the leakage current threshold.

[0008] Further, when the circuit breaker performs the first self-check, the leakage condition is that the leakage current is less than the leakage current threshold, and when the circuit breaker performs the second self-check, the leakage condition is that the leakage current is greater than the leakage current threshold.

[0009] Further, after the circuit breaker detects a leakage current, it will also compare the detected leakage current with the set leakage current threshold. When the detected leakage current is greater than the leakage current threshold, the circuit breaker performs a tripping operation.

[0010] Further, the gateway detects the opening state of the circuit breaker. During the first self-check, if the circuit breaker performs an opening operation, the gateway reports to the cloud server; if the circuit breaker does not perform an opening operation, the circuit breaker conducts a second leakage self-check.

[0011] During the second self-check, if the circuit breaker performs an opening operation, the gateway queries whether the circuit breaker enables the reclosing permission through a query instruction. If so, the gateway sends an instruction to make the circuit breaker perform a reclosing operation, and at the same time, the gateway clears the timer; if the circuit breaker does not perform an opening operation, the gateway reports to the cloud server.

[0012] Further, before the gateway issues a leakage self-check instruction to the circuit breaker, it first issues a current transformer self-check instruction to the circuit breaker. After receiving the current transformer self-check instruction, the circuit breaker generates a leakage waveform sample of a fixed size. The circuit breaker collects and calculates the leakage value to compare with the sample value. If the difference meets the preset value, the current transformer self-check of the circuit breaker ends; if the difference does not meet the preset value, the circuit breaker sets the current transformer failure flag and sends it to the gateway. The gateway reads the status of the circuit breaker and reports it to the cloud server. If this fault is not processed within 12 hours, the circuit breaker trips and enters the opening anti-closing state.

[0013] In a second aspect, an embodiment of the present application provides a system for detecting a leakage protection function. The system includes a gateway and a circuit breaker. The circuit breaker includes a switching unit, an electronic control unit, a leakage self-check unit, a leakage current transformer sampling unit, and an internal waveform generating unit. The gateway and the circuit breaker are communicatively connected. The gateway is used to detect the status of the circuit breaker and send instructions to the circuit breaker. The switching unit is used to mechanically control the disconnection or closure of the power transmission line. The electronic control unit is used to receive gateway signals and control the switching unit, the leakage self-check unit, the leakage current transformer sampling unit, and the internal waveform generating unit to perform self-checks. The leakage self-check unit is used to receive a leakage instruction and generate a leakage condition according to the leakage instruction. The leakage current transformer sampling unit is used to collect leakage current under the leakage condition. The internal waveform generating unit is used to generate a leakage sample signal with a fixed-size waveform.

[0014] Further, it further includes an alarm module. The alarm module is used to receive an instruction sent by the gateway during a leakage fault and issue an alarm signal when receiving the leakage signal of the gateway.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The present invention provides a method and a system for detecting the leakage protection function. By sending an instruction to the circuit breaker through the gateway to perform the leakage self-check of the circuit breaker, the leakage self-check operation can be automatically carried out. By setting two different leakage conditions, the leakage detection status of the circuit breaker under different conditions is detected, problems occurring in the leakage protection function can be discovered in a timely manner, and the problems occurring are uploaded to the cloud, which is beneficial to timely maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only the preferred embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall system flow of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following describes the principles and features of the present invention with reference to the drawings. The listed embodiments are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] Referring to Figure 1 , the present invention provides a first aspect. An embodiment of the present application provides a method for detecting the leakage protection function. The method includes: the gateway performs periodic timing. When the timing time reaches a predetermined value, a leakage self-check instruction is issued. After receiving the leakage self-check instruction, the circuit breaker generates a leakage current according to the leakage conditions. The circuit breaker performs a total of two leakage self-checks under different leakage conditions, and makes a judgment on the trip operation when the circuit breaker detects the leakage current.

[0021] A leakage current threshold is set in the circuit breaker. The leakage conditions include that the leakage current is less than the leakage current threshold and the leakage current is greater than the leakage current threshold.

[0022] Exemplarily, the periodic timing can be set according to the detection requirements, such as one month or two months. Whenever the timing reaches the set time, the gateway will issue a leakage self-check instruction, and the circuit breaker performs the leakage self-check through the leakage self-check instruction.

[0023] When the circuit breaker performs the first self-check, the leakage condition is that the leakage current is less than the leakage current threshold. When the circuit breaker performs the second self-check, the leakage condition is that the leakage current is greater than the leakage current threshold.

[0024] After the circuit breaker detects the leakage current, it will also compare the detected leakage current with the set leakage current threshold. When the detected leakage current is greater than the leakage current threshold, the circuit breaker performs a trip operation.

[0025] Exemplarily, two different leakage conditions are set to perform leakage self-check on the circuit breaker, and the leakage judgment of the circuit breaker under the two conditions is detected.

[0026] The gateway detects the tripped state of the circuit breaker. During the first self-check, if the circuit breaker trips, the gateway reports to the cloud server; if the circuit breaker does not trip, the circuit breaker performs the second leakage self-check.

[0027] During the second self-check, if the circuit breaker trips, the gateway queries whether the circuit breaker enables the reclosing permission through a query instruction. If so, the gateway sends an instruction to make the circuit breaker perform the reclosing operation, and at the same time the gateway clears the timer; if the circuit breaker does not trip, the gateway reports to the cloud server.

[0028] Exemplarily, when the first leakage self-check is performed, the generated leakage current should be less than the set leakage current threshold, and at this time the circuit breaker will not trip; if the circuit breaker trips during the first leakage self-check, it indicates a leakage detection failure of the circuit breaker, and the gateway reports to the cloud server for repair; when the second leakage self-check is performed, the generated leakage current should be greater than the set leakage current threshold, and at this time the circuit breaker should trip; if the circuit breaker does not trip at this time, it indicates a leakage detection failure of the circuit breaker, and the gateway reports to the cloud server for repair; if the circuit breaker trips, it is further detected whether the circuit breaker can perform the reclosing operation.

[0029] Before the gateway sends a leakage self-check instruction to the circuit breaker, it first sends a current transformer self-check instruction to the circuit breaker. After receiving the current transformer self-check instruction, the circuit breaker generates a leakage waveform sample of a fixed size. The circuit breaker collects and calculates the leakage value to compare with the sample value. If the difference meets the preset value, the current transformer self-check of the circuit breaker ends; if the difference does not meet the preset value, the circuit breaker sets the current transformer failure flag and sends it to the gateway. The gateway reads the status of the circuit breaker and reports to the cloud server. If this fault is not processed within 12 hours, the circuit breaker trips and enters the tripped anti-closing state.

[0030] In a second aspect, an embodiment of the present application provides a system for detecting a leakage protection function. The system includes a gateway and a circuit breaker. The circuit breaker includes a closing and opening unit, an electronic control unit, a leakage self-check unit, a leakage current transformer sampling unit, and an internal waveform generating unit. The gateway and the circuit breaker are communicatively connected. The gateway is configured to detect the state of the circuit breaker and send instructions to the circuit breaker. The closing unit is configured to mechanically manipulate the disconnection of the power transmission line. The electronic control unit is configured to receive signals from the gateway and control the closing and opening unit, the leakage self-check unit, the leakage current transformer sampling unit, and the internal waveform generating unit to perform self-checks. The leakage self-check unit is configured to receive a leakage instruction and generate a leakage condition according to the leakage instruction. The leakage current transformer sampling unit is configured to collect a leakage current under the leakage condition. The internal waveform generating unit is configured to generate a leakage sample signal with a fixed waveform size.

[0031] The system further includes an alarm module. The alarm module is configured to receive an instruction sent by the gateway during a leakage fault and issue an alarm signal when receiving the leakage signal from the gateway.

[0032] The foregoing are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for detecting leakage protection function, characterized in that: The method comprises: the gateway performs periodic timing, and when the timing time reaches a predetermined value, issues a leakage self-check instruction, and after receiving the leakage self-check instruction, the circuit breaker generates a leakage current according to the leakage condition, and the circuit breaker performs two leakage self-checks under different leakage conditions, and when the circuit breaker detects the leakage current, it determines the opening operation; A leakage current threshold is set in the circuit breaker, and the leakage conditions include the leakage current being less than the leakage current threshold and the leakage current being greater than the leakage current threshold.

2. A method for detecting leakage protection function according to claim 1, characterized in that: The leakage condition during the first self-test of the circuit breaker is that the leakage current is less than the leakage current threshold, and the leakage condition during the second self-test is that the leakage current is greater than the leakage current threshold.

3. A method for detecting leakage protection function according to claim 2, characterized in that: After the circuit breaker detects the leakage current, it will compare the detected leakage current with the set leakage current threshold. When the detected leakage current is greater than the leakage current threshold, the circuit breaker will perform a tripping operation.

4. A method for detecting leakage protection function according to claim 3, characterized in that: The gateway detects the opening status of the circuit breaker. During the first self-test, if the circuit breaker is opened, the gateway reports to the cloud server; if the circuit breaker is not opened, the circuit breaker performs a second leakage self-test; During the second self-test, if the circuit breaker performs an opening operation, the gateway queries whether the circuit breaker has the reclosing permission enabled through a query instruction. If so, the gateway sends an instruction to make the circuit breaker perform the reclosing operation, and the gateway resets the timer at the same time; if the circuit breaker does not perform an opening operation, the gateway reports to the cloud server.

5. The method for detecting leakage protection function according to claim 1, characterized in that: Before sending the leakage self-test command to the circuit breaker, the gateway first sends the transformer self-test command to the circuit breaker. After receiving the transformer self-test command, the circuit breaker generates a fixed-size leakage waveform sample. The circuit breaker collects and calculates the leakage value to compare the sample value. If the difference meets the preset value, the circuit breaker transformer self-test ends; if the difference does not meet the preset value, the circuit breaker sets the transformer failure flag and sends it to the gateway. The gateway reads the circuit breaker status and reports it to the cloud server. If the fault is not handled within 12 hours, the circuit breaker trips and enters the opening and anti-closing state.

6. A system for detecting leakage protection function, characterized in that: The system includes a gateway and a circuit breaker. The circuit breaker includes an opening and closing unit, an electric control unit, a leakage self-detection unit, a leakage current transformer sampling unit and an internal waveform generating unit. The gateway is communicatively connected to the circuit breaker. The gateway is used to detect the circuit breaker state and send instructions to the circuit breaker. The opening and closing unit is used to mechanically operate the transmission line to open or close. The electric control unit is used to receive gateway signals and control the opening and closing unit, the leakage self-detection unit, the leakage current transformer sampling unit and the internal waveform generating unit to perform self-detection. The leakage self-detection unit is used to receive leakage instructions and generate leakage conditions according to the leakage instructions. The leakage current transformer sampling unit is used to collect leakage current under leakage conditions. The internal waveform generating unit is used to generate a leakage sample signal with a fixed size waveform.

7. A system for detecting leakage protection function, characterized in that: It also includes an alarm module, which is used to receive instructions issued by the gateway when a leakage fault occurs, and to send an alarm signal when receiving a leakage signal from the gateway.

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