Trip monitoring circuit

Abstract

The invention discloses a tripping monitoring circuit, which comprises at least one tripping monitoring branch, the tripping monitoring branch is connected with the tripping branch in a one-to-one correspondence manner, and the tripping monitoring branch is used for monitoring a tripping signal of the corresponding tripping branch; 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 invention can lock the tripping reason of the equipment in time, and saves the troubleshooting processing time.

Description

Technical Field

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

[0002] In the power system, the tripping circuit is an indispensable part. Remote tripping, local tripping, protection tripping, external interlocking tripping, etc. are all realized by the tripping circuit. In actual situations, most of the tripping circuits with unknown reasons are instantaneous or accidental, and it is impossible to lock the tripping branch.

[0003] At present, the methods for checking the cause of tripping include conducting insulation tests on each tripping branch, detecting the operation of the DC power supply, suspecting a DC power supply failure if the DC power supply is grounded or AC is intruding, and using an external recording device to conduct input detection on each branch. All of the above methods take a long time to lock in the cause of the fault, and recording monitoring may cause the equipment to trip again, resulting in poor monitoring effect. Summary of the invention

[0004] The invention provides a trip monitoring circuit to solve the problem of poor effect of monitoring trip 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 the trip branches 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 the connection node of the indication module and the branch blocking module, and the protection device is used to record the 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 tripping 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 tripping 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 tripping 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 tripping 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 tripping 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 tripping branch.

[0013] Optionally, the trip monitoring circuit also includes a third trip monitoring branch, the trip branch also 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 tripping 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 tripping 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 tripping 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 tripping 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 tripping 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 tripping branch.

[0017] Optionally, the protection device includes a relay and a controller, the relay is connected to a 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 invention provides a trip monitoring circuit, which 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 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 branches, 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 present invention 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 trip circuit effect in the prior art.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they 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 creative work.

[0021] Figure 1 It is a structural schematic diagram of a trip monitoring circuit provided by an embodiment of the present invention;

[0022] Figure 2 It is a circuit diagram of a trip monitoring circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work 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 data 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 that are 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 present invention provides a trip monitoring circuit. Figure 1 is a schematic diagram of a trip monitoring circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the trip monitoring circuit 100 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 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, the tripping branch refers to a circuit that controls the tripping action, and is turned on when a tripping signal is received. 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 is a circuit that monitors each tripping branch, the branch blocking module 110 is a module that blocks the reverse conduction of the tripping monitoring branch, and the indication module 120 is a module that outputs an indication signal when the tripping branch is turned on. The protection device 130 is a general-purpose integrated protection and measurement and control device that integrates monitoring, recording, storage, control and other functions. The protection device 130 includes a relay and a controller, and can record and store the received tripping signal.

[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 branches, 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 processing time, and solve the problem of poor monitoring effect of tripping circuit in the prior art.

[0029] Figure 2 is a circuit diagram of a trip monitoring circuit provided by an embodiment of the present invention, 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] Combination 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 type of the first tripping branch is local tripping, and local tripping refers to the on-site operation tripping of the circuit breaker switch. 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 positive electrode of the first diode D1), the second end of the first diode D1 (i.e., the negative electrode 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 is closed, the first tripping branch is turned on, the first indicator light Led1 in the first tripping monitoring branch is on, and the protection device 130 records the local tripping signal. At the same time, the first diode D1 ensures that the first tripping branch is forwardly turned on.

[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] Combination Figure 1 The second tripping 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 tripping 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 tripping 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, and 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 is closed, the second tripping branch is turned on, the second indicator light Led2 in the second tripping monitoring branch is on, 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 forwardly conductive.

[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 tripping 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 tripping 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 tripping branch.

[0037] Exemplarily, the type of the third tripping branch is a test tripping, and the test tripping refers to a tripping operation for testing the opening and closing ability and arc extinguishing ability of the circuit breaker. The third tripping branch includes a second tripping button K2, a third contact T3 and a tripping coil Q, wherein 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 positive electrode of the third diode D3), the second end of the third diode D3 (i.e., the negative electrode 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 tripping button K2 is pressed, the third contact T3 is closed, the third tripping branch is turned on, the third indicator light Led3 in the third trip monitoring branch is on, and the protection device 130 records the test tripping signal. At the same time, the third diode D3 ensures that the third tripping 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, a first end of the tripping contact T4 of the cabinet is connected to the positive terminal L+, a second end of the tripping contact T4 of the cabinet is connected to the first end of the fourth indicator light Led4, a second end of the fourth indicator light Led4 is connected to the first end of the fourth diode D4 (i.e., the positive electrode of the fourth diode D4), a second end of the fourth diode D4 (i.e., the negative electrode of the fourth diode D4) is connected to the first end of the tripping coil Q, and a 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 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] On the basis of the above embodiment, the protection tripping also includes the whole section tripping branch, the upstream tripping branch and the interlocking tripping branch, and correspondingly, the tripping monitoring circuit also includes the whole section tripping monitoring branch 250, the upstream tripping monitoring branch 260 and the interlocking tripping monitoring branch 270. Among them, the upstream tripping refers to the tripping due to the transformer fault, the whole section tripping refers to the tripping due to the medium voltage bus fault, the medium voltage bus refers to the equipment connecting the transformer and the switch cabinet, and the interlocking tripping refers to the tripping when the system fails or in order to prevent the system from abnormal conditions such as overvoltage, overload, instability, etc.

[0042] Specifically, the whole section tripping branch includes the whole section tripping contact T5 and the tripping coil Q, and the whole section tripping monitoring branch includes the fifth indicator light Led5, the fifth diode D5 and the protection device 130. The first end of the whole section tripping contact T5 is connected to the positive terminal L+, the second end of the whole 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 positive electrode of the fifth diode D5), the second end of the fifth diode D5 (i.e., the negative electrode 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 whole section tripping monitoring branch is used to monitor the whole section tripping. When the whole section trips, the whole section tripping contact T5 is closed, the whole section tripping branch is turned on, the fifth indicator light Led5 in the whole section tripping monitoring branch is on, and the protection device 130 records the whole section tripping signal. At the same time, the fifth diode D5 ensures that the whole section tripping branch is forwardly turned on.

[0043] The upstream tripping branch includes an upstream tripping contact T6 and a tripping coil Q, and 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 positive electrode of the sixth diode D6), the second end of the sixth diode D6 (i.e., the negative electrode 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 the upstream tripping. When the upstream trips, the upstream tripping contact T6 is closed, the upstream tripping branch is turned on, the sixth indicator light Led6 in the upstream tripping monitoring branch is on, and the protection device 130 records the upstream tripping signal. At the same time, the sixth diode D6 ensures that the entire tripping branch is forwardly conductive.

[0044] The interlocking tripping branch includes an interlocking tripping contact T7 and a tripping coil Q, and the interlocking tripping monitoring branch includes a seventh indicator light Led7, a seventh diode D7, and a protection device 130. The first end of the interlocking tripping contact T7 is connected to the positive terminal L+, the second end of the interlocking 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 positive electrode of the seventh diode D7), the second end of the seventh diode D7 (i.e., the negative electrode 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 interlocking tripping monitoring branch is used to monitor the interlocking tripping. When the interlocking tripping occurs, the interlocking tripping contact T7 is closed, the interlocking tripping branch is turned on, the seventh indicator light Led7 in the interlocking tripping monitoring branch is on, and the protection device 130 records the interlocking tripping signal. At the same time, the seventh diode D7 ensures that the entire tripping branch is forwardly conductive.

[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] Exemplarily, 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 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 turned on, the positive potential of the first diode changes to +110V. At this time, the signal input to the protection device 130 is 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 operates, and the controller will record this input change (0→1), the record has a time mark, and the first indicator light Led1 lights up. When the first tripping branch is instantly connected (i.e., a pulse signal), the signal input to the protection device 130 is a high level, that is, there is an input, and the instantaneous input changes from 1 to 0. At the same time, the controller will record this input change (0→1→0), the record has a time mark, and the first indicator light Led1 lights up instantly and then goes out. Since the protection device 130 has the function of recording the input change, it can still be recorded for easy query. For example, the model of protection device 130 can be SEL-351. The positive pole A+ of the power supply is connected to a 110V power supply, and the negative pole A- of the power supply is connected to a -110V power supply. The cable of each trip monitoring branch is a 1.5 square cable. The indicator light is used to show whether the corresponding trip branch is actuated. If the trip branch is actuated, the trip branch is energized and the indicator light turns on. If the trip branch is not actuated, the trip branch is not energized and the indicator light turns off. When the equipment is operating normally, the trip coil Q carries a negative charge of 110V. A diode is added to the trip monitoring circuit to prevent the indicator light from turning on. At the same time, it has a branch blocking function, which can realize one-to-one monitoring of the trip branches.

[0047] In this embodiment, each trip monitoring branch is isolated by installing a diode in each trip monitoring branch, thereby realizing one-to-one monitoring of the trip branches. For the instantaneous pulse trip signal, the displacement of the input record of the query protection device can be checked and judged, which can solve the problem that the trip monitoring circuit in the prior art has no self-holding and no recording functions, and the transformation workload and cost are low. By installing indicator lights in each branch, the display function of the branch gate can be realized. For the long level trip signal, the trip branch can be locked by the indicator light, which is convenient for the operation and maintenance personnel to lock the cause of the equipment trip in time, save the troubleshooting processing time, efficiently complete the troubleshooting, shorten the equipment downtime, reduce economic losses and reduce a lot of labor consumption. At the same time, it has a wide range of applications and 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 processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0049] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A trip monitoring circuit, characterized in that: The trip monitoring circuit comprises 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 the connection node of the indication module and the branch blocking module, and the protection device is used to record the 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 also includes a third trip monitoring branch, and the trip branch also 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 tripping 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 tripping 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 tripping 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 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.

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