Circuit and method for detecting false switching-on and false switching-off of low-voltage air switch

Abstract

The invention discloses a circuit and method for detecting false opening and closing of a low-voltage air switch, and relates to the technical field of power distribution network low-voltage circuit maintenance, and the circuit comprises a low-voltage air switch, an indicating lamp connected with the low-voltage air switch in parallel, and a voltmeter connected with the low-voltage air switch in parallel. The indicating lamp is connected in the control loop, is connected in parallel with an auxiliary contact of the low-voltage air switch, and is used for displaying the state of the air switch. And the voltmeter is connected in the measuring loop and is used for measuring the voltage level of the circuit. The method has the beneficial effects that the workload is effectively reduced, and the maintenance work is ensured to be completed according to quality and quantity within the time limit specified by the plan, so that the lean management is really implemented; electricity testing and safety measures can be rapidly carried out, personal risks of high falling and electric shock caused by pole climbing electricity testing and safety measures are avoided, and the working efficiency of maintenance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage circuit maintenance in a distribution network, and in particular to a circuit and method for detecting false opening and closing of a low-voltage circuit breaker. Background Art

[0002] In the inspection and maintenance of low-voltage lines in the distribution network, technicians face many problems in terms of work safety, operating efficiency, and equipment protection. First, in order to ensure the safety of operators, multiple sets of grounding wires must be installed. This process not only consumes time and human resources, but also poses safety hazards such as falling during high-altitude operations. At the same time, the heavy task of electrical inspection operations also increases the complexity and risk of the operation.

[0003] In addition, when the distribution network experiences seasonal load changes, especially during peak periods such as the Spring Festival, spring ploughing, summer cooling, water pumping for drought relief, and winter heating, the power consumption increases significantly, causing the voltage to drop, which not only affects the power supply quality, but may also cause low voltage problems. Low voltage may be caused by factors such as too long power supply radius, small wire diameter, unreasonable transformer operation gear, excessive load rate, insufficient reactive power, or three-phase imbalance. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a circuit for detecting false opening and false closing of a low-voltage circuit breaker, in order to solve the problem that the false opening state of the existing low-voltage circuit breaker is difficult to judge, resulting in a major safety hazard during the operation of workers.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a circuit for detecting false opening and false closing of a low-voltage circuit breaker, comprising: a low-voltage circuit breaker, an indicator light connected in parallel with the low-voltage circuit breaker, and a voltmeter connected in parallel with the low-voltage circuit breaker;

[0007] The indicator light is connected in the control circuit and is connected in parallel with the auxiliary contact of the low-voltage circuit breaker to display the status of the circuit breaker;

[0008] The voltmeter is connected in the measuring loop and is used to measure the voltage level of the circuit.

[0009] As a preferred solution of the circuit for detecting false opening and false closing of a low-voltage circuit breaker according to the present invention, it also includes:

[0010] A transformer and a connecting knife switch, wherein the output end of the transformer is connected to the connecting knife switch.

[0011] As a preferred solution of the circuit for detecting false opening and false closing of a low-voltage circuit breaker of the present invention, the output end of the transformer is provided with a first phase line L1, a second phase line L2 and a third phase line L3;

[0012] The connecting knife switch is a three-phase connecting knife switch, which is connected to three groups of phase lines respectively to achieve independent control of a single phase line.

[0013] As a preferred solution of the circuit for detecting false opening and false closing of a low-voltage circuit breaker of the present invention, the output end of the low-voltage circuit breaker is respectively connected to the output end of the transformer;

[0014] The low-voltage circuit breaker is provided with NC contacts;

[0015] The transformer is provided with NO contacts.

[0016] As a preferred solution of the circuit for detecting false opening and false closing of a low-voltage circuit breaker of the present invention, it further comprises a grounding switch connected in parallel with the low-voltage circuit breaker;

[0017] The transformer is connected to the output end of the grounding switch;

[0018] The grounding switch is used to ground the circuit during maintenance.

[0019] As a preferred solution of the circuit for detecting false opening and false closing of a low-voltage circuit breaker of the present invention, a conversion switch is provided between the grounding knife switch and the voltmeter;

[0020] The conversion switch is connected in parallel with the entire circuit;

[0021] The conversion switch is used to change the circuit connection mode.

[0022] The beneficial effects of the invention are as follows: the invention effectively reduces the workload, ensures that the maintenance work is completed in quality and quantity within the planned time limit, so that lean management is truly implemented; quickly conducts electrical testing and takes safety measures, avoids the risks of falling from heights and electric shock caused by climbing poles to test electricity and take safety measures, and improves the work efficiency of maintenance.

[0023] Another object of the present invention is to provide a method for detecting false opening and closing of a low-voltage circuit breaker, the purpose of which is to solve the problem.

[0024] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for detecting false opening and false closing of a low-voltage circuit breaker, comprising a circuit for detecting false opening and false closing of a low-voltage circuit breaker; and judging the state of the low-voltage circuit breaker, and detecting whether the low-voltage circuit breaker is falsely opened by an indicator light and a voltmeter;

[0025] Rapid electrical test: use indicator lights and voltmeters to quickly test the power outage line, and then quickly switch the maintenance line for inspection by turning the grounding switch.

[0026] As a preferred solution of the method for detecting false opening and closing of a low-voltage circuit breaker of the present invention, it confirms that the wiring is correct, detects the correctness of the low-voltage line wiring through indicator lights and voltmeters, and determines the correctness and completeness of the power transmission operation.

[0027] The method for detecting false opening and closing of a low-voltage circuit breaker of the present invention has the following beneficial effects: quickly restoring power supply, shortening power outage time, and improving power supply reliability; ensuring power safety, preventing the expansion of power outage area, and reducing user complaint rate; and quickly detecting the correctness of wiring to avoid impact and damage to electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 Schematic diagram of the connection structure of the circuit for detecting the false opening and closing of a low-voltage circuit breaker.

[0030] Figure 2 The figure is a flow chart of the circuit for detecting false opening and false closing of low-voltage circuit breaker. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1

[0035] Reference Figure 1-2, is the first embodiment of the present invention, which provides a circuit for detecting false opening and closing of a low-voltage circuit breaker, comprising a low-voltage circuit breaker 101, an indicator light 102 connected in parallel with the low-voltage circuit breaker 101, and a voltmeter 103 connected in parallel with the low-voltage circuit breaker 101; the indicator light 102 is connected in a control loop and in parallel with the auxiliary contacts of the low-voltage circuit breaker 101, for displaying the state of the circuit breaker; the voltmeter 103 is connected in a measuring loop, for measuring the voltage level of the circuit.

[0036] In this embodiment, the indicator light 102 is connected in the control circuit of the low-voltage circuit breaker 101, and is usually connected in parallel with the auxiliary contacts of the low-voltage circuit breaker 101; in this way, when the low-voltage circuit breaker 101 is closed, the current passes through the auxiliary contacts, the indicator light 102 lights up, and the display circuit is in the on state.

[0037] The color and number of indicator lights 102 may vary depending on the design, but typically at least one indicator light 102 will indicate the on / off status of a circuit; for example, a green indicator light may indicate that a circuit is on, while a red indicator light may indicate that a circuit is off or has a fault.

[0038] Furthermore, the voltmeter 103 is connected in parallel in the circuit to measure the voltage level in the circuit; in a three-phase system, the voltmeter 103 can be configured to measure the phase-to-phase voltage such as L1-L2, L2-L3, L3-L1 or the voltage relative to the neutral line such as L1-N, L2-N, L3-N.

[0039] The connection point of the voltmeter 103 should be selected at a position that can accurately reflect the circuit status; it can be connected upstream of the low-voltage circuit breaker 101 to measure the voltage output by the transformer, or connected downstream to measure the voltage at the load end.

[0040] Specifically, the state of the low-voltage circuit breaker 101 determines whether the circuit is connected; when the low-voltage circuit breaker 101 is closed, current can pass, the indicator light 102 lights up, and the voltmeter 103 displays the power supply voltage.

[0041] When the low voltage circuit breaker 101 is disconnected, the circuit is cut off, the indicator light 102 goes out, and the reading of the voltmeter 103 will depend on its connection position;

[0042] If the voltmeter 103 is connected upstream of the low-voltage circuit breaker 101, the reading will be close to the power supply voltage; if it is connected downstream, the reading will be close to zero.

[0043] The indicator light 102 and the voltmeter 103 are connected to the entire circuit through a control loop and a measuring loop; the indicator light 102 in the control loop is connected to the auxiliary contact of the low-voltage circuit breaker 101 to display the state of the circuit breaker.

[0044] The voltmeter 103 in the measuring loop is connected in parallel in the circuit to measure the voltage level of the circuit; these components together constitute a monitoring system for the circuit to ensure safe operation and fault diagnosis of the circuit.

[0045] In summary, the indicator light 102 and the voltmeter 103 monitor the circuit status and voltage level by connecting with the control circuit and the measurement circuit of the low-voltage circuit breaker 101. The opening and closing state of the low-voltage circuit breaker 101 directly affects the display of the indicator light 102 and the reading of the voltmeter 103, thereby providing important information for the operation and maintenance of the circuit; thereby improving the safety and reliability of the circuit and ensuring that problems can be discovered and handled in a timely manner during maintenance and operation.

[0046] Example 2

[0047] Reference Figure 1-2 , which is the second embodiment of the present invention, and which is different from the first embodiment in that: it also includes, in the previous embodiment, the circuit for detecting the false opening and false closing of the low-voltage circuit breaker includes a transformer 104 and a connecting knife switch 105, and the output end of the transformer 104 is connected to the connecting knife switch 105.

[0048] In this embodiment, in a three-phase low-voltage power distribution system, the low-voltage output end of the transformer 104 is configured with three phase line outputs, respectively marked as the first phase line L1, the second phase line L2 and the third phase line L3, and a neutral line output N; these output ends are connected to the input end of the low-voltage circuit breaker 101 through a connecting knife switch 105; the connecting knife switch 105 is a three-phase connecting knife switch 105, and each phase line has an independent connecting knife switch 105 to achieve independent control of each phase line.

[0049] Furthermore, the low-voltage circuit breaker 101 is also a three-phase circuit breaker, the first phase line L1, the second phase line L2 and the third phase line L3 each have a corresponding circuit breaker contact, and the neutral line N is connected to the system through an independent contact.

[0050] It should be noted that, when the connecting knife switch 105 is in normal operation, the normally closed contact is closed, so that the low-voltage output of the transformer can be smoothly transmitted to the low-voltage circuit breaker 101.

[0051] When inspection or maintenance is required, the operator can switch the connection switch 105 to the normally open contact state, thereby disconnecting the electrical connection between the transformer and the low-voltage circuit breaker, ensuring the safe isolation of the low-voltage circuit breaker and its downstream circuits.

[0052] The connecting knife switch 105 is located at the low-voltage output end of the transformer and is used to provide an obvious disconnection point during inspection or maintenance to ensure that the circuit is completely isolated from the power supply; the downstream of the connecting knife switch 105 is connected to the low-voltage circuit breaker 101.

[0053] The low-voltage circuit breaker 101 is located downstream of the connecting knife switch 105 and is used to automatically disconnect the circuit when the circuit is overloaded or short-circuited to protect the circuit and equipment from damage; the downstream of the low-voltage circuit breaker 101 is connected to the grounding knife switch 106.

[0054] The grounding switch 106 is located downstream of the low-voltage circuit breaker 101 and is used to ground the circuit during maintenance to ensure the safety of the operator; the closed state of the grounding switch 106 can be displayed by an indicator light.

[0055] The changeover switch 107 is connected in parallel in the circuit, usually between the grounding switch 106 and the voltmeter 103. The changeover switch 107 is used to change the connection mode of the circuit so as to perform different operations or tests.

[0056] In summary, during the entire connection process, the power supply is stepped down by the transformer, then connected to the load through the isolating switch and low-voltage circuit breaker, and then through the grounding knife switch. The indicator light, transfer switch and voltmeter are connected in parallel in the circuit to monitor and control the status of the circuit. When maintenance is required, the operator will first operate the isolating switch to disconnect the power supply, then operate the grounding knife switch to ground the circuit, and confirm the status of the circuit through the indicator light and voltmeter. The transfer switch is used to switch between different test or operation modes. This design ensures that the safety and status of the circuit can be effectively monitored and managed during maintenance and repair.

[0057] Example 3 Reference Figure 1-2 , which is the third embodiment of the present invention, is different from the previous two embodiments in that it includes: judging the state of the low-voltage circuit breaker, detecting whether the low-voltage circuit breaker has a false trip through an indicator light and a voltmeter; quickly testing the power supply of the power-off line through an indicator light and a voltmeter, and then quickly switching the maintenance line for inspection by turning the grounding switch.

[0059] Preferably, when performing low-voltage line maintenance, the indicator light and voltmeter equipped with the low-voltage circuit breaker false opening and false closing device can be used to effectively detect whether the low-voltage circuit breaker has a false opening phenomenon; this process also includes indirect electrical testing of the low-voltage line to prevent serious misoperation caused by the false opening state; these misoperations may occur during the operation of the high-voltage drop-out fuse of the distribution transformer and the low-voltage knife switch in the JP cabinet, which may cause personal injury, equipment damage, and unnecessary expansion of the power outage scope.

[0060] The indicator lights and voltmeters ensure that the true status of the low-voltage circuit breaker is accurately monitored during maintenance, thereby ensuring the safety of operation. The indicator lights provide operators with intuitive circuit status information, while the voltmeter provides accurate voltage readings. The two work together to improve the safety and efficiency of maintenance work. This design not only reduces potential risks, but also helps maintain the stable operation of the power system and ensure the continuity and reliability of power supply.

[0061] Furthermore, a quick power test is performed by using indicator lights and voltmeters to quickly test the power outage line, and then the maintenance line is quickly switched for inspection by turning the grounding switch.

[0062] Specifically, when performing maintenance work on low-voltage lines, the equipped indicator lights and voltmeters can be used to quickly and effectively test the power of the power-off lines. The grounding switch in the device allows the maintenance line to be quickly and safely transferred to the maintenance state. This design significantly reduces the workload when preparing safety measures and effectively reduces the risk of falling during high-altitude operations.

[0063] Through the indicator lights, the staff can intuitively identify the different states of the circuit, while the voltmeter provides accurate voltage information to ensure the accuracy of the power test process. The grounding knife switch is easy to operate and can quickly cut off the power supply, providing a safe working environment for maintenance work.

[0064] Furthermore, confirm that the wiring is correct, check the correctness of the low-voltage line wiring through indicator lights and voltmeters, and at the same time determine the correctness and completeness of the power supply operation.

[0065] It should be noted that after the low-voltage line maintenance work is completed, the indicator light and voltmeter can be used to detect the correctness of the low-voltage line wiring, such as confirming whether the live wire and the neutral wire are correctly connected. This step is crucial to prevent damage to electrical equipment that may be caused by wiring errors, thereby avoiding the resulting economic losses.

[0066] When preparing to restore power, indicator lights and voltmeters once again play an important role in ensuring the accuracy and integrity of the power transmission operation. Through these devices, workers can verify whether the circuit is in the correct state and whether the voltage is stable within a safe range, thereby safely completing the power transmission process. Such measures not only ensure the reliability of the power system, but also ensure the safety of electrical equipment and personnel.

[0067] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A circuit for detecting false opening and closing of a low-voltage circuit breaker, characterized in that: include, A low-voltage circuit breaker (101), an indicator light (102) connected in parallel with the low-voltage circuit breaker (101), and a voltmeter (103) connected in parallel with the low-voltage circuit breaker (101); The indicator light (102) is connected in the control circuit and is connected in parallel with the auxiliary contact of the low-voltage circuit breaker (101) to display the state of the circuit breaker; The voltmeter (103) is connected in the measurement loop and is used to measure the voltage level of the circuit.

2. The circuit for detecting false opening and false closing of a low-voltage circuit breaker according to claim 1, characterized in that: Also includes, A transformer (104) and a connection switch (105), wherein the output end of the transformer (104) is connected to the connection switch (105).

3. The circuit for detecting false opening and false closing of a low-voltage circuit breaker as claimed in claim 2, characterized in that: The output end of the transformer (104) is provided with a first phase line L1, a second phase line L2 and a third phase line L3; The connection knife switch (105) is a three-phase connection knife switch (105), which is respectively connected to three groups of phase lines to achieve independent control of a single phase line.

4. The circuit for detecting false opening and false closing of a low-voltage circuit breaker according to claim 2 or 3, characterized in that: The output ends of the low-voltage circuit breaker (101) are respectively connected to the output ends of the transformer (104); The low-voltage circuit breaker (101) is provided with an NC contact; The transformer (104) is provided with NO contacts.

5. The circuit for detecting false opening and false closing of a low-voltage circuit breaker as claimed in claim 4, characterized in that: It also includes a grounding switch (106) connected in parallel with the low-voltage circuit breaker (101); The transformer (104) is connected to the output end of the grounding switch (106); The grounding switch (106) is used to ground the circuit during maintenance.

6. The circuit for detecting false opening and false closing of a low-voltage circuit breaker as claimed in claim 5, characterized in that: A conversion switch (107) is provided between the grounding switch (106) and the voltmeter (103); The conversion switch (107) is connected in parallel with the entire circuit; The conversion switch (107) is used to change the circuit connection mode.

7. A method for detecting false opening and closing of a low-voltage circuit breaker, characterized in that: A circuit for detecting false opening and false closing of a low-voltage circuit breaker according to any one of claims 1 to 6; and Determine the status of the low-voltage circuit breaker and use the indicator light and voltmeter to detect whether the low-voltage circuit breaker has a false trip; Rapid electrical test: use indicator lights and voltmeters to quickly test the power outage line, and then quickly switch the maintenance line for inspection by turning the grounding switch.

8. The method for detecting false opening and false closing of a low-voltage circuit breaker according to claim 7, characterized in that: Confirm that the wiring is correct, check the correctness of the low-voltage line wiring through indicator lights and voltmeters, and at the same time determine the correctness and completeness of the power supply operation.

Images