Trip monitoring circuit

Abstract

The utility model discloses a trip-out monitoring circuit, which comprises at least one trip-out monitoring branch circuit, the trip-out monitoring branch circuits are connected with the trip-out branch circuits in a one-to-one correspondence manner, and the trip-out monitoring branch circuits are used for monitoring trip-out signals of the corresponding trip-out branch circuits; the tripping monitoring branch comprises a branch blocking module, an indication module and a protection device; the indication module and the branch blocking module are connected in series and then are connected in series to the tripping branch; the indication module is used for indicating a tripping signal of the tripping branch, and the branch blocking module is used for blocking reverse conduction of the tripping monitoring branch; the protection device is connected with a connection node of the indication module and the branch blocking module, and the protection device is used for recording a tripping signal of the tripping branch. The tripping monitoring circuit provided by the utility model can lock the tripping reason of the equipment in time, and saves the troubleshooting processing time.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical control, in particular to a trip monitoring circuit. Background Art

[0002] Trip circuits are an essential component of power systems, enabling remote tripping, local tripping, protection tripping, and external interlocking tripping. In practice, most unexplained trips in trip circuits are instantaneous or sporadic, making it impossible to lock the tripping branch.

[0003] Currently, methods for checking the cause of tripping include performing insulation tests on each tripping branch, checking the operation of the DC power supply. If the DC power supply is grounded or AC is intruding, a DC power supply failure is suspected, and using an external recorder to perform input detection on each branch. All of the above methods take a long time to identify the cause of the fault, and the recording monitoring may cause the equipment to trip again, resulting in poor monitoring effect. Utility Model Content

[0004] The utility model provides a trip monitoring circuit to solve the problem of poor effect of the trip monitoring circuit in the prior art.

[0005] According to one aspect of the present invention, a trip monitoring circuit is provided, the trip monitoring circuit comprising at least one trip monitoring branch, the trip monitoring branch being connected to a trip branch in a one-to-one correspondence, the trip monitoring branch being used to monitor a trip signal corresponding to the trip branch;

[0006] The trip monitoring branch includes a branch blocking module, an indication module and a protection device;

[0007] The indication module and the branch blocking module are connected in series and then connected in series to the tripping branch; the indication module is used to indicate the tripping signal of the tripping branch, and the branch blocking module is used to block the reverse conduction of the tripping monitoring branch;

[0008] The protection device is connected to a connection node of the indication module and the branch blocking module, and is used to record a tripping signal of the tripping branch.

[0009] Optionally, the trip monitoring circuit includes a first trip monitoring branch, the trip branch includes a first trip branch, the first trip monitoring branch is connected to the first trip branch, and the first trip monitoring branch is used to monitor the trip signal of the first trip branch.

[0010] Optionally, the first trip monitoring branch includes a first indication module and a first branch blocking module, the first indication module includes a first indicator light, the first branch blocking module includes a first diode, the first end of the first indicator light is connected to the first trip branch, the second end of the first indicator light is connected to the first end of the first diode and the protection device, and the second end of the first diode is connected to the first trip branch.

[0011] Optionally, the trip monitoring circuit further includes a second trip monitoring branch, the trip branch further includes a second trip branch, the second trip monitoring branch is connected to the second trip branch, and the second trip monitoring branch is used to monitor the trip signal of the second trip branch.

[0012] Optionally, the second trip monitoring branch includes a second indication module and a second branch blocking module, the second indication module includes a second indicator light, the second branch blocking module includes a second diode, the first end of the second indicator light is connected to the second trip branch, the second end of the second indicator light is connected to the first end of the second diode and the protection device, and the second end of the second diode is connected to the second trip branch.

[0013] Optionally, the trip monitoring circuit further includes a third trip monitoring branch, the trip branch further includes a third trip branch, the third trip monitoring branch is connected to the third trip branch, and the third trip monitoring branch is used to monitor the trip signal of the third trip branch.

[0014] Optionally, the third trip monitoring branch includes a third indication module and a third branch blocking module, the third indication module includes a third indicator light, the third branch blocking module includes a third diode, the first end of the third indicator light is connected to the third trip branch, the second end of the third indicator light is connected to the first end of the third diode and the protection device, and the second end of the third diode is connected to the third trip branch.

[0015] Optionally, the trip monitoring circuit further includes a fourth trip monitoring branch, the trip branch further includes a fourth trip branch, the fourth trip monitoring branch is connected to the fourth trip branch, and the fourth trip monitoring branch is used to monitor the trip signal of the fourth trip branch.

[0016] Optionally, the fourth trip monitoring branch includes a fourth indication module and a fourth branch blocking module, the fourth indication module includes a fourth indicator light, the fourth branch blocking module includes a fourth diode, the first end of the fourth indicator light is connected to the fourth trip branch, the second end of the fourth indicator light is connected to the first end of the fourth diode and the protection device, and the second end of the fourth diode is connected to the fourth trip branch.

[0017] Optionally, the protection device includes a relay and a controller, the relay is connected to the connection node between the indication module and the branch blocking module, the controller is connected to the relay, the relay is used to output a switching signal according to the received tripping signal, and the controller records data according to the switching signal.

[0018] The technical solution of the embodiment of the present utility model provides a trip monitoring circuit, which includes at least one trip monitoring branch, which is connected to the trip branch in a one-to-one correspondence, and the trip monitoring branch is used to monitor the trip signal of the corresponding trip branch; the trip monitoring branch includes a branch blocking module, an indication module and a protection device; the indication module and the branch blocking module are connected in series and then connected in series to the trip branch; when one of the trip branches is turned on, the indication module is used to indicate the trip signal of the trip branch, and the branch blocking module can block the conduction of the trip monitoring branch connected to other trip branches, thereby realizing one-to-one monitoring of the trip branch, and the protection device is connected to the connection node of the indication module and the branch blocking module, and the protection device is used to record the trip signal of the trip branch. Therefore, the trip monitoring circuit provided by the utility model can monitor and record different trip branches one by one, so as to timely lock the cause of equipment tripping, save troubleshooting processing time, and solve the problem of poor monitoring effect of the trip circuit in the prior art.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in 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 paying any creative work.

[0021] Figure 1 This is a structural diagram of a trip monitoring circuit provided by an embodiment of the utility model;

[0022] Figure 2 This is a circuit diagram of a trip monitoring circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] The embodiment of the utility model provides a trip monitoring circuit, Figure 1 This is a schematic diagram of the structure of a trip monitoring circuit provided by an embodiment of the present utility model. Figure 1 As shown, the trip monitoring circuit 100 includes at least one trip monitoring branch, which is connected to the trip branch in a one-to-one correspondence, and the trip monitoring branch is used to monitor the trip signal of the corresponding trip branch. The trip monitoring branch includes a branch blocking module 110, an indication module 120, and a protection device 130; the indication module 120 and the branch blocking module 110 are connected in series and then connected in series to the trip branch; the indication module 120 is used to indicate the trip signal of the trip branch, and the branch blocking module 110 is used to block the reverse conduction of the trip monitoring branch; the protection device 130 is connected to the connection node of the indication module 120 and the branch blocking module 110, and the protection device 130 is used to record the trip signal of the trip branch.

[0026] In this embodiment, a tripping branch refers to a circuit that controls the tripping action and is turned on upon receiving a tripping signal. For example, the tripping branch includes a switch K, a tripping coil Q, a positive terminal L+, and a negative terminal L-. The tripping monitoring circuit 100 monitors each tripping branch. The branch blocking module 110 blocks reverse conduction of the tripping monitoring branch. The indication module 120 outputs an indication signal when the tripping branch is turned on. The protection device 130 is a universal integrated protection and measurement and control device that integrates monitoring, recording, storage, and control functions. The protection device 130 includes a relay and a controller, and can record and store received tripping signals.

[0027] Exemplarily, the first tripping branch includes a switch K1 and a tripping coil Q, the first tripping monitoring branch includes a first indication module, a first branch blocking module, and a protection device 130, the second tripping branch includes a switch K2 and a tripping coil Q, the second tripping monitoring branch includes a second indication module, a second branch blocking module, and a protection device 130, the nth tripping branch includes a switch Kn and a tripping coil Q, and the nth tripping monitoring branch includes an nth indication module, an nth branch blocking module, and a protection device 130. When the first tripping branch is turned on (i.e., the switch K1 is closed and the tripping coil Q is energized), the first tripping monitoring branch receives a tripping signal, for example, the tripping signal is a high-level signal, the relay in the protection device 130 is actuated according to the received high-level signal, and the controller in the protection device 130 records and stores data according to the action of the relay. At this time, the first indication module outputs an indication signal, and the first branch blocking module blocks the reverse conduction of the tripping monitoring branch, thereby improving the stability of the input signal of the protection device and making the recording result of the protection device 130 more accurate. Multiple tripping branches are connected in parallel, the nth tripping branch is not conducting (i.e. Kn is disconnected, n≠1), and the nth branch blocking module in the nth tripping monitoring branch blocks the reverse conduction of the nth tripping monitoring branch, where n≠1, so that the tripping monitoring branches corresponding to the non-conducting tripping branches cannot be conducted, thereby realizing one-to-one monitoring of the tripping branches.

[0028] The technical solution of this embodiment provides a trip monitoring circuit, which includes at least one trip monitoring branch, which is connected to the trip branch in a one-to-one correspondence, and the trip monitoring branch is used to monitor the trip signal of the corresponding trip branch; the trip monitoring branch includes a branch blocking module, an indication module and a protection device; the indication module and the branch blocking module are connected in series and then connected in series to the trip branch; when one of the trip branches is turned on, the indication module is used to indicate the trip signal of the trip branch, and the branch blocking module can block the conduction of the trip monitoring branch connected to other trip branches, thereby realizing one-to-one monitoring of the trip branch, and the protection device is connected to the connection node of the indication module and the branch blocking module, and the protection device is used to record the trip signal of the trip branch. Therefore, the trip monitoring circuit provided in this embodiment can monitor and record different trip branches one by one, so as to timely lock the cause of equipment tripping, save troubleshooting time, and solve the problem of poor monitoring effect of the trip circuit in the prior art.

[0029] Figure 2 This is a circuit diagram of a trip monitoring circuit provided by an embodiment of the present utility model, such as Figure 2 As shown, the trip monitoring circuit 100 includes a first trip monitoring branch 210 , the trip branch includes a first trip branch, the first trip monitoring branch is connected to the first trip branch, and the first trip monitoring branch is used to monitor the trip signal of the first trip branch.

[0030] Combine Figure 1 The first trip monitoring branch 210 includes a first indication module and a first branch blocking module, the first indication module includes a first indicator light Led1, the first branch blocking module includes a first diode D1, the first end of the first indicator light Led1 is connected to the first trip branch, the second end of the first indicator light Led1 is connected to the first end of the first diode D1 and the protection device 130, and the second end of the first diode D1 is connected to the first trip branch.

[0031] Exemplarily, the first tripping branch is a local tripping branch, which refers to an on-site tripping operation of the circuit breaker. The first tripping branch includes a first tripping button K1, a first contact T1, and a tripping coil Q. The first end of the first tripping button K1 is connected to the positive terminal L+, the second end of the first tripping button K1 is connected to the first end of the first contact T1, the second end of the first contact T1 is connected to the first end of the first indicator light Led1, the second end of the first indicator light Led1 is connected to the first end of the first diode D1 (i.e., the anode of the first diode D1), the second end of the first diode D1 (i.e., the cathode of the first diode D1) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The first tripping monitoring branch is used to monitor the local tripping. When the first tripping button K1 is pressed, the first contact T1 closes, the first tripping branch conducts, the first indicator light Led1 in the first tripping monitoring branch lights up, and the protection device 130 records the local tripping signal. At the same time, the first diode D1 ensures forward conduction of the first tripping branch.

[0032] Continue to refer Figure 2 The trip monitoring circuit 100 further includes a second trip monitoring branch 220, the trip branch further includes a second trip branch, the second trip monitoring branch is connected to the second trip branch, and the second trip monitoring branch is used to monitor the trip signal of the second trip branch.

[0033] Combine Figure 1 The second trip monitoring branch includes a second indication module and a second branch blocking module, the second indication module includes a second indicator light Led2, the second branch blocking module includes a second diode D2, the first end of the second indicator light Led2 is connected to the second trip branch, the second end of the second indicator light Led2 is connected to the first end of the second diode D2 and the protection device 130, and the second end of the second diode D2 is connected to the second trip branch.

[0034] Exemplarily, the type of the second tripping branch is remote tripping. The second tripping branch includes a second contact T2 and a tripping coil Q. The first end of the second contact T2 is connected to the positive terminal L+, the second end of the second contact T2 is connected to the first end of the second indicator light Led2, the second end of the second indicator light Led2 is connected to the first end of the second diode D2 (i.e., the positive electrode of the second diode D2), the second end of the second diode D2 (i.e., the negative electrode of the second diode D2) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The second tripping monitoring branch is used to monitor remote tripping. Remote tripping refers to the main control room operating the switch to open. When the main control room operates the switch to open, the second contact T2 closes, the second tripping branch is connected, the second indicator light Led2 in the second tripping monitoring branch lights up, and the protection device 130 records the remote tripping signal. At the same time, the second diode D2 ensures that the second tripping branch is forward-conducted.

[0035] Continue to refer Figure 2 The trip monitoring circuit 100 further includes a third trip monitoring branch 230 , the trip branch further includes a third trip branch, the third trip monitoring branch is connected to the third trip branch, and the third trip monitoring branch is used to monitor the trip signal of the third trip branch.

[0036] Specifically, the third trip monitoring branch includes a third indication module and a third branch blocking module, the third indication module includes a third indicator light Led3, the third branch blocking module includes a third diode D3, the first end of the third indicator light Led3 is connected to the third trip branch, the second end of the third indicator light Led2 is connected to the first end of the third diode D3 and the protection device 130, and the second end of the third diode D3 is connected to the third trip branch.

[0037] Exemplarily, the type of the third tripping branch is test tripping, which refers to a tripping operation for testing the opening and closing capability and arc extinguishing capability of the circuit breaker. The third tripping branch includes a second tripping button K2, a third contact T3, and a tripping coil Q. The first end of the second tripping button K2 is connected to the positive terminal L+, the second end of the second tripping button K2 is connected to the first end of the third contact T3, the second end of the third contact T3 is connected to the first end of the third indicator light Led3, the second end of the third indicator light Led3 is connected to the first end of the third diode D3 (i.e., the anode of the third diode D3), the second end of the third diode D3 (i.e., the cathode of the third diode D3) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The first trip monitoring branch is used to monitor the test tripping. When the second trip button K2 is pressed, the third contact T3 is closed, the third trip branch is turned on, the third indicator light Led3 in the third trip monitoring branch lights up, and the protection device 130 records the test tripping signal. At the same time, the third diode D3 ensures that the third trip branch is forward-conducted.

[0038] Continue to refer Figure 2 The trip monitoring circuit 100 further includes a fourth trip monitoring branch 240 , the trip branch further includes a fourth trip branch, the fourth trip monitoring branch is connected to the fourth trip branch, and the fourth trip monitoring branch is used to monitor the trip signal of the fourth trip branch.

[0039] Specifically, the fourth tripping monitoring branch includes a fourth indication module and a fourth branch blocking module, the fourth indication module includes a fourth indicator light Led4, the fourth branch blocking module includes a fourth diode D4, the first end of the fourth indicator light Led4 is connected to the fourth tripping branch, the second end of the fourth indicator light Led4 is connected to the first end of the fourth diode D4 and the protection device 130, and the second end of the fourth diode D4 is connected to the fourth tripping branch.

[0040] Exemplarily, the type of the fourth tripping branch is protection tripping, which refers to tripping caused by faults such as overload and short circuit. The fourth tripping branch includes a tripping contact T4 of the cabinet and a tripping coil Q. The first end of the tripping contact T4 of the cabinet is connected to the positive terminal L+, the second end of the tripping contact T4 of the cabinet is connected to the first end of the fourth indicator light Led4, the second end of the fourth indicator light Led4 is connected to the first end of the fourth diode D4 (i.e., the anode of the fourth diode D4), the second end of the fourth diode D4 (i.e., the cathode of the fourth diode D4) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The fourth tripping monitoring branch is used to monitor the tripping of this cabinet. The tripping of this cabinet refers to the tripping caused by the fault of this cabinet (the switch cabinet that needs to be protected). When this cabinet trips, the tripping contact T4 of this cabinet is closed, the fourth tripping branch is turned on, the fourth indicator light Led4 in the fourth tripping monitoring branch is on, and the protection device 130 records the tripping signal of this cabinet. At the same time, the fourth diode D4 ensures that the fourth tripping branch is forward-conducted.

[0041] Based on the above embodiment, the protection tripping circuit further includes a whole-section tripping branch, an upstream tripping branch, and an interlocking tripping branch. Accordingly, the tripping monitoring circuit further includes a whole-section tripping monitoring branch 250, an upstream tripping monitoring branch 260, and an interlocking tripping monitoring branch 270. An upstream tripping circuit refers to a tripping circuit caused by a transformer fault, a whole-section tripping circuit refers to a tripping circuit caused by a medium-voltage busbar fault, and a medium-voltage busbar refers to the equipment connecting the transformer and the switchgear. An interlocking tripping circuit refers to a tripping circuit caused by a system fault or to prevent the system from experiencing abnormal conditions such as overvoltage, overload, or instability.

[0042] Specifically, the entire section tripping branch includes an entire section tripping contact T5 and a tripping coil Q, and the entire section tripping monitoring branch includes a fifth indicator light Led5, a fifth diode D5, and a protection device 130. The first end of the entire section tripping contact T5 is connected to the positive terminal L+, the second end of the entire section tripping contact T5 is connected to the first end of the fifth indicator light Led5, the second end of the fifth indicator light Led5 is connected to the first end of the fifth diode D5 (i.e., the anode of the fifth diode D5), the second end of the fifth diode D5 (i.e., the cathode of the fifth diode D5) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The entire section tripping monitoring branch is used to monitor the entire section tripping. When the entire section trips, the entire section tripping contact T5 closes, the entire section tripping branch conducts, the fifth indicator light Led5 in the entire section tripping monitoring branch lights up, and the protection device 130 records the entire section tripping signal. Simultaneously, the fifth diode D5 ensures that the entire section tripping branch conducts in the forward direction.

[0043] The upstream tripping branch includes an upstream tripping contact T6 and a tripping coil Q. The upstream tripping monitoring branch includes a sixth indicator light Led6, a sixth diode D6, and a protection device 130. The first end of the upstream tripping contact T6 is connected to the positive terminal L+, the second end of the upstream tripping contact T6 is connected to the first end of the sixth indicator light Led6, the second end of the sixth indicator light Led6 is connected to the first end of the sixth diode D6 (i.e., the anode of the sixth diode D6), the second end of the sixth diode D6 (i.e., the cathode of the sixth diode D6) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The upstream tripping monitoring branch is used to monitor upstream tripping. When an upstream trip occurs, the upstream tripping contact T6 closes, the upstream tripping branch conducts, the sixth indicator light Led6 in the upstream tripping monitoring branch illuminates, and the protection device 130 records the upstream tripping signal. Simultaneously, the sixth diode D6 ensures forward conduction of the entire tripping branch.

[0044] The interlock tripping branch includes an interlock tripping contact T7 and a tripping coil Q. The interlock tripping monitoring branch includes a seventh indicator light Led7, a seventh diode D7, and a protection device 130. The first end of the interlock tripping contact T7 is connected to the positive terminal L+, the second end of the interlock tripping contact T7 is connected to the first end of the seventh indicator light Led7, the second end of the seventh indicator light Led7 is connected to the first end of the seventh diode D7 (i.e., the anode of the seventh diode D7), the second end of the seventh diode D7 (i.e., the cathode of the seventh diode D7) is connected to the first end of the tripping coil Q, and the second end of the tripping coil Q is connected to the negative terminal L-. The interlock tripping monitoring branch is used to monitor interlock tripping. When an interlock trip occurs, the interlock tripping contact T7 closes, the interlock tripping branch conducts, the seventh indicator light Led7 in the interlock tripping monitoring branch illuminates, and the protection device 130 records the interlock tripping signal. Simultaneously, the seventh diode D7 ensures that the entire tripping branch is forward-conducting.

[0045] Continue to refer Figure 2 The protection device includes a relay KT and a controller (not shown in the figure). The relay KT is connected to the connection node of the indication module 120 and the branch blocking module 110. The controller is connected to the relay. The relay KT is used to output a switching signal according to the received tripping signal, and the controller records data according to the switching signal.

[0046] For example, the connection node between the indicator light and the diode in each trip monitoring branch is connected to the vacant input circuit of the protection device 130, and the protection device 130 realizes the trip monitoring function by changing the input point. For long-level trip signals, the trip branch can be locked by the indicator light; for instantaneous pulse trip signals, the position change of the input record of the protection device 130 can be checked and judged. The voltage level of the trip circuit is DC 220V, that is, the positive terminal L+ is 110V and the negative terminal L- is -110V. Before each trip branch is not turned on, the positive electrode potential of the diode is 0V, and the trip branch has no trip signal output. At this time, the signal input to the protection device 130 is low level, that is, there is no voltage input to the IN port of the protection device 130, the protection device 130 has no input, the relay KT does not operate, and the indicator light is off. When the first tripping branch is conducting, the positive electrode potential of the first diode changes to +110V. At this time, the signal input to the protection device 130 is at a high level (i.e., a tripping signal), that is, there is a voltage input to the IN port of the protection device 130, the protection device 130 has an input, the relay KT is activated, and the controller will record this input change (0→1), the record is marked with a time stamp, and the first indicator light Led1 is lit. When the first tripping branch is instantaneously connected (i.e., a pulse signal), the signal input to the protection device 130 is at a high level, that is, there is an input, and the input instantly changes from 1 to 0. At the same time, the controller will record this input change (0→1→0), the record is marked with a time stamp, and the first indicator light Led1 is instantly lit and then extinguished. Because the protection device 130 has the function of recording the input change, this can still be recorded for easy query. For example, the SEL-351 can be used for protection device 130. Connect the positive terminal A+ to a 110V power supply, and the negative terminal A- to a -110V power supply. Use 1.5-square-meter cable for each trip monitoring branch. An indicator light indicates whether the corresponding trip branch has operated. If the trip branch has operated, the trip branch is energized, and the indicator light illuminates. If the trip branch has not operated, the trip branch is de-energized, and the indicator light is off. During normal operation, trip coil Q carries a negative 110V charge. A diode is added to the trip monitoring circuit to prevent the indicator light from illuminating. This circuit also provides a branch blocking function, enabling individual monitoring of each trip branch.

[0047] In this embodiment, each trip monitoring branch is isolated by adding a diode to each trip monitoring branch, thereby realizing one-to-one monitoring of the trip branches. For instantaneous pulse trip signals, the position change of the input record of the protection device can be checked and judged, which can solve the problem of the trip monitoring circuit in the prior art having no self-holding and no recording function, and the transformation workload and cost are low. By adding an indicator light to each branch, the display function of the branch switch can be realized. For long-level trip signals, the trip branch can be locked by the indicator light, which makes it convenient for operation and maintenance personnel to promptly lock the cause of the equipment tripping, save troubleshooting time, efficiently complete fault handling, shorten equipment downtime, reduce economic losses and reduce a large amount of labor consumption. At the same time, the application range is wide, and it can be widely used in the control circuits of power systems, industrial and mining enterprises, railways and other industries.

[0048] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0049] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A trip monitoring circuit, characterized in that: The trip monitoring circuit includes at least one trip monitoring branch, the trip monitoring branch is connected to the trip branch in a one-to-one correspondence, and the trip monitoring branch is used to monitor the trip signal corresponding to the trip branch; The trip monitoring branch includes a branch blocking module, an indication module and a protection device; The indication module and the branch blocking module are connected in series and then connected in series to the tripping branch; the indication module is used to indicate the tripping signal of the tripping branch, and the branch blocking module is used to block the reverse conduction of the tripping monitoring branch; The protection device is connected to a connection node of the indication module and the branch blocking module, and is used to record a tripping signal of the tripping branch.

2. The trip monitoring circuit according to claim 1, characterized in that: The trip monitoring circuit includes a first trip monitoring branch, the trip branch includes a first trip branch, the first trip monitoring branch is connected to the first trip branch, and the first trip monitoring branch is used to monitor the trip signal of the first trip branch.

3. The trip monitoring circuit according to claim 2, characterized in that: The first trip monitoring branch includes a first indication module and a first branch blocking module, the first indication module includes a first indicator light, the first branch blocking module includes a first diode, the first end of the first indicator light is connected to the first trip branch, the second end of the first indicator light is connected to the first end of the first diode and the protection device, and the second end of the first diode is connected to the first trip branch.

4. The trip monitoring circuit according to claim 1, characterized in that: The trip monitoring circuit further includes a second trip monitoring branch, and the trip branch further includes a second trip branch, the second trip monitoring branch is connected to the second trip branch, and the second trip monitoring branch is used to monitor the trip signal of the second trip branch.

5. The trip monitoring circuit according to claim 4, characterized in that: The second trip monitoring branch includes a second indication module and a second branch blocking module, the second indication module includes a second indicator light, the second branch blocking module includes a second diode, the first end of the second indicator light is connected to the second trip branch, the second end of the second indicator light is connected to the first end of the second diode and the protection device, and the second end of the second diode is connected to the second trip branch.

6. The trip monitoring circuit according to claim 1, characterized in that: The trip monitoring circuit further includes a third trip monitoring branch, and the trip branch further includes a third trip branch. The third trip monitoring branch is connected to the third trip branch, and the third trip monitoring branch is used to monitor the trip signal of the third trip branch.

7. The trip monitoring circuit according to claim 6, characterized in that: The third trip monitoring branch includes a third indication module and a third branch blocking module, the third indication module includes a third indicator light, the third branch blocking module includes a third diode, the first end of the third indicator light is connected to the third trip branch, the second end of the third indicator light is connected to the first end of the third diode and the protection device, and the second end of the third diode is connected to the third trip branch.

8. The trip monitoring circuit according to claim 1, characterized in that: The trip monitoring circuit further includes a fourth trip monitoring branch, and the trip branch further includes a fourth trip branch. The fourth trip monitoring branch is connected to the fourth trip branch, and the fourth trip monitoring branch is used to monitor the trip signal of the fourth trip branch.

9. The trip monitoring circuit according to claim 8, characterized in that: The fourth trip monitoring branch includes a fourth indication module and a fourth branch blocking module, the fourth indication module includes a fourth indicator light, the fourth branch blocking module includes a fourth diode, the first end of the fourth indicator light is connected to the fourth trip branch, the second end of the fourth indicator light is connected to the first end of the fourth diode and the protection device, and the second end of the fourth diode is connected to the fourth trip branch.

10. The trip monitoring circuit according to claim 1, characterized in that: The protection device includes a relay and a controller, the relay is connected to the connection node of the indication module and the branch blocking module, the controller is connected to the relay, the relay is used to output a switching signal according to the received tripping signal, and the controller records data according to the switching signal.

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