CN118199003A - Circuit breaker tripping circuit and fault monitoring circuit thereof - Google Patents
Circuit breaker tripping circuit and fault monitoring circuit thereof Download PDFInfo
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- CN118199003A CN118199003A CN202410230062.5A CN202410230062A CN118199003A CN 118199003 A CN118199003 A CN 118199003A CN 202410230062 A CN202410230062 A CN 202410230062A CN 118199003 A CN118199003 A CN 118199003A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 76
- 238000001514 detection method Methods 0.000 claims abstract description 120
- 230000009471 action Effects 0.000 claims abstract description 24
- 238000002955 isolation Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a tripping circuit of a circuit breaker and a fault monitoring circuit thereof, belonging to the technical field of protection control of circuit breakers. The circuit comprises a main circuit and an auxiliary circuit, wherein the main circuit comprises a first detection branch and a second detection branch which are both provided with detection elements, and the detection elements are used for acting when detecting that current flows in the branches; one end of the first detection branch is used for being connected with a power supply of the tripping circuit, the other end of the first detection branch is connected with one end of the second detection branch, the connecting point is used for being connected with a connecting point between a tripping contact in the tripping circuit and an auxiliary contact at the position of the circuit breaker, and the other end of the second detection branch is used for being connected with a detection contact at the opening position of the circuit breaker; the auxiliary circuit comprises a logic processing unit, wherein the input end of the logic processing unit is connected with the action signal generated by the detection element, and the action signal is used for judging the tripping loop fault when no action signal is received. The trip circuit includes the fault monitoring circuit described above. The invention meets the requirement of monitoring the fault of the tripping circuit in the full state of the circuit breaker.
Description
Technical Field
The invention belongs to the technical field of circuit breaker protection control, and particularly relates to a circuit breaker tripping circuit and a fault monitoring circuit thereof.
Background
For a circuit breaker, a tripping circuit is generally used for enabling a closing coil to be electrified when a tripping command is received, so that the circuit breaker is opened, a power grid fault is isolated in time, and the safe operation of the power grid is ensured. Therefore, the tripping circuit plays an important role in the operation reliability of the circuit breaker, if the tripping circuit of the circuit breaker breaks down, the power grid fault cannot be timely isolated, an override trip fault point can be possibly caused, large-area power loss is caused, and the loss is huge. Therefore, it is highly desirable to provide a fault monitoring circuit for a circuit interrupter trip circuit.
The prior art is directed to a trip circuit monitoring circuit as shown in fig. 1. The normally open contact 1-1 of the trip outlet relay, the auxiliary contact 52a of the breaker position and the trip coil TC are connected in series to form a trip circuit, a breaker opening position detecting contact 52b which is linked with the auxiliary contact 52a of the breaker is arranged, the contacts 52a and 52b are linked and interlocked, and the breaker opening position detecting contact 52b is connected in series in a circuit breaker position monitoring circuit (a circuit where the current detecting element BI1 is arranged) to indicate the opening position state of the breaker. When a trip command is received, the normally open contact 1-1 of the trip outlet relay is controlled to be closed, so that the trip coil TC is electrified to control the breaker to be opened, when the breaker is in an opened state, the breaker position auxiliary contact 52a is opened, and simultaneously the contact 52b is closed, and at the moment, a monitoring loop is conducted to indicate that the breaker is in the opened state. In the opening state, when a tripping coil fails or a circuit breaker position auxiliary contact fails, a monitoring circuit where the current detection element BI1 is located cannot be conducted, and at the moment, a tripping circuit failure alarm is sent out and closing operation is blocked, so that the problem that the circuit failure occurs in the closing state of the circuit breaker and tripping protection cannot be carried out, and the circuit failure is enlarged (the circuit breaker of the upper stage trips) is prevented.
The above-mentioned prior art can monitor the breaker trip circuit fault information in the open state, but can not monitor the trip circuit fault in the closed state of the breaker, and when monitoring the breaker trip circuit fault in the open state, it is necessary to know the open and close state of the breaker in advance to determine whether the breaker trip coil has failed. This does not meet the trip circuit fault monitoring requirements in the full state of the circuit breaker.
Disclosure of Invention
The invention aims to provide a tripping circuit of a circuit breaker and a fault monitoring circuit thereof, so as to solve the problem that the existing tripping circuit fault monitoring circuit cannot meet the requirement of tripping circuit fault monitoring under the full state of the circuit breaker.
The invention provides a fault monitoring circuit of a tripping loop of a circuit breaker for solving the technical problems, which comprises a main circuit and an auxiliary circuit, wherein the main circuit comprises a first detection branch and a second detection branch, detection elements are respectively arranged in the first detection branch and the second detection branch, and the detection elements are used for acting when detecting that current flows in the branch; one end of the first detection branch is used for connecting a power supply of the tripping circuit, the other end of the first detection branch is connected with one end of the second detection branch, the connecting point is used for connecting a connecting point between a tripping contact and an auxiliary contact at the position of the breaker in the tripping circuit, and the other end of the second detection branch is used for connecting a detection contact at the breaking position of the breaker, which is linked with the auxiliary contact at the position of the breaker; the auxiliary circuit comprises a logic processing unit, wherein the input end of the logic processing unit is connected with the action signal generated by the detection element and is used for judging the tripping loop fault when no action signal is received.
Further, the main circuit further comprises a diode, wherein the anode of the diode is connected with a connection point between the first detection branch and the second detection branch, and the cathode of the diode is used for connecting a connection point between a tripping contact and an auxiliary contact of the position of the circuit breaker in the tripping circuit.
Further, the logic processing unit comprises a logic or element and a delay function module, wherein the input end of the logic or element is respectively connected with the action signal generated by the detection element, the output end of the logic or element is connected with the output end of the delay function module, and the delay function module is used for outputting a fault monitoring result after delay setting time.
Further, the logic processing unit is a CPU unit capable of implementing logic processing and delay functions.
Further, the auxiliary circuit further comprises an alarm indicating unit for alarming when the tripping circuit fails, and the alarm indicating unit is connected to the output end of the logic processing unit.
Further, the auxiliary circuit further comprises a closing operation control unit, which is used for closing operation when the tripping circuit fails, and the closing operation control unit is connected to the output end of the logic processing unit.
Further, a power isolation unit is arranged between the logic processing unit and the alarm indication circuit.
Further, the detection element is a current detection element.
Further, the fault monitoring circuit further comprises a switching-on/off position monitoring unit, wherein the input end of the switching-on/off position monitoring unit is connected with an action signal generated by the detection element and used for judging that the circuit breaker is in a switching-on state when the detection element in the first detection branch circuit acts and the detection element in the second detection branch circuit does not act, and judging that the circuit breaker is in a switching-off state when the detection elements in the first detection branch circuit and the second detection branch circuit act.
The fault monitoring circuit has the beneficial effects that: the fault monitoring circuit provided by the invention can judge whether the tripping circuit is in a switching-off state or a switching-on state, and the tripping circuit is in a fault as long as the detection element has no action signal, so that the fault monitoring circuit can judge whether the tripping circuit is in a fault or not in the switching-on state and the switching-off state, and meets the requirement of monitoring the faults of the tripping circuit in the whole state of the circuit breaker. In addition, the fault judging process does not need to know the current switch position state of the circuit breaker in advance, so that the fault judging process does not depend on a circuit breaker position monitoring loop, and the fault monitoring circuit is high in universality.
The invention provides a breaker tripping circuit with a fault monitoring function, which aims to solve the technical problems, and comprises a tripping contact, a breaker position auxiliary contact and a tripping coil which are sequentially connected in series, and also comprises a breaker opening position detection contact which is linked with the breaker position auxiliary contact, wherein the breaker position auxiliary contact and the breaker opening position detection contact are both connected with one end of the tripping coil, the tripping circuit also comprises the fault monitoring circuit of the breaker tripping circuit, one end of a second detection branch of the fault monitoring circuit is connected with one end of the breaker opening position detection contact which is not connected with the tripping coil, and a connecting point between the tripping contact and the breaker position auxiliary contact in the tripping circuit is connected with a connecting point between the first detection branch and the second detection branch.
The circuit breaker tripping circuit has the beneficial effects that: the tripping circuit provided by the invention is provided with the fault monitoring circuit, and can judge whether the circuit breaker has faults or not when the circuit breaker is in a switching-off state or a switching-on state, so that the requirement of monitoring the faults of the tripping circuit in the whole state of the circuit breaker is met. In addition, the fault judging process does not need to know the current switch position state of the circuit breaker in advance, so that the circuit breaker position monitoring loop is not relied on, and the universality is strong.
Drawings
FIG. 1 is a prior art circuit breaker trip circuit fault monitoring circuit;
FIG. 2 is a circuit for breaker trip circuit fault monitoring in a tripped condition in accordance with an embodiment of the invention;
Fig. 3 is a circuit for breaker trip circuit fault monitoring in a closed state in accordance with an embodiment of the present invention;
In fig. 2 and 3, 1-1 is a trip contact, 1-2 is a diode D1,1-3 is a breaker auxiliary contact, 1-4 is a breaker position detection contact, 1-5 is a trip coil TC,1-6 is a current detection element BI1,1-7 is a current detection element BI2,2-1 is a current detection element BI1 output signal, 2-2 is a current detection element BI2 output signal, 2-3 is a logic or element, 2-4 is a delay function module, and 3-1 is a power isolation unit.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
The basic idea of the invention is that: the existing monitoring circuit (figure 1) is improved in hardware and is combined with an integrated circuit or a micro-processing unit which realizes processing logic and delay processing so as to provide a general monitoring circuit which realizes the full-state fault monitoring of a tripping circuit.
Based on the basic idea, the fault monitoring circuit of the tripping circuit of the circuit breaker of the embodiment comprises a main circuit and an auxiliary circuit, wherein the main circuit comprises a first detection branch and a second detection branch, detection elements are respectively arranged in the first detection branch and the second detection branch, and the detection elements are used for acting when detecting that current flows in the branches; one end of the first detection branch is used for being connected with a power supply of the tripping circuit, the other end of the first detection branch is connected with one end of the second detection branch, the connecting point is used for being connected with a connecting point between a tripping contact and an auxiliary contact at the position of the breaker in the tripping circuit, and the other end of the second detection branch is used for being connected with a detection contact at the breaking position of the breaker, which is linked with the auxiliary contact at the position of the breaker. The auxiliary circuit comprises a logic processing unit, wherein the input end of the logic processing unit is connected with action signals generated by the two detection elements, and the action signals are used for judging the tripping circuit fault when no action signals are received.
Further, in order to effectively protect the trip contact from closing, the power supply directly flows through the detecting element in the second detecting branch circuit to cause the circuit to generate heat, a diode D1 is added in the main circuit of the embodiment, the anode of the diode D1 is connected with the connection point between the first detecting branch circuit and the second detecting branch circuit, and the cathode of the diode D1 is used for connecting the connection point between the trip contact and the auxiliary contact at the position of the circuit breaker in the trip circuit.
The logic processing unit of the embodiment can use an integrated circuit to construct a logic processing and delay function module, specifically set a logic or element and the delay function module, the input end of the logic or element is respectively connected to action signals generated by the detection elements in the first detection branch and the second detection branch, the output end of the logic or element is connected to the output end of the delay function module, and the delay function module is used for outputting a fault monitoring result after delay setting time. The set time here is typically 600ms. Alternatively, the logic processing unit may use the CPU unit to implement logic processing and delay functions using software.
Further, the auxiliary circuit also comprises an alarm indicating unit used for alarming when the tripping circuit fails, and the alarm indicating unit is connected with the output end of the logic processing unit.
Further, the auxiliary circuit further comprises a closing operation control unit for closing operation when the tripping circuit fails, and the closing operation control unit is connected to the output end of the logic processing unit.
Further, a power isolation unit is arranged between the logic processing unit and the alarm indication circuit.
Further, the detection element adopts a current detection element.
Further, the fault monitoring circuit further comprises a switching-on/off position monitoring unit, wherein the input end of the switching-on/off position monitoring unit is connected with an action signal generated by the detection element, and is used for judging that the circuit breaker is in a switching-on state when the detection element in the first detection branch circuit acts and the detection element in the second detection branch circuit does not act, and judging that the circuit breaker is in a switching-off state when the detection elements in the first detection branch circuit and the second detection branch circuit both act. Therefore, the monitoring circuit of the embodiment not only realizes the fault state monitoring of the tripping circuit, but also monitors the opening and closing position state of the circuit breaker.
As a preferred embodiment, the monitoring circuit of the present embodiment may be integrally mounted on a Printed Circuit Board (PCB).
As a preferred embodiment, the monitoring circuit of the present embodiment may be designed integrally with the relay protection device that drives the circuit breaker, or as another embodiment, may be designed as a separate module.
The embodiment is a monitoring circuit for a protection device to drive a tripping circuit, when a plurality of devices drive a circuit breaker in parallel, the circuit breaker can be designed into a multi-path tripping circuit monitoring circuit by utilizing a plurality of pairs of position auxiliary contacts of the circuit breaker, but all multi-path detection elements are connected with the tripping coils of the circuit breaker, loop currents are required to be matched to prevent the heating of the circuit breaker coils, and the tripping of the circuit breaker caused by overlarge monitoring loop currents (the action current of the circuit breaker is generally between 0.25A and 2A, and the monitoring loop is ensured to be within 10 mA).
The technical solution of the invention will be further described with a specific tripping circuit.
As shown in fig. 2, a trip circuit of a circuit breaker includes a trip contact 1-1, a circuit breaker position auxiliary contact 52a (1-3 element), and a trip coil TC (1-5 element) serially connected between the positive and negative poles of a power source in this order. The monitoring circuit of this embodiment includes a main circuit including a breaker-opening position detecting contact 52b (1-4 element), a current detecting element BI1 (1-6 element), a current detecting element BI2 (1-7 element) and a diode D1 (1-2 element) that are interlocked and interlocked with a breaker-position auxiliary contact 52a, the current detecting element BI1 having one end connected to a power supply positive electrode and the other end connected to one end of the current detecting element BI2, the other end of the current detecting element BI2 connected to one end of the contact 52b, and the other end of the contact 52b connected to a connection line between the breaker-position auxiliary contact 52a and the trip coil TC. The positive electrode of the diode D1 is connected to the connection line between the current detecting element BI1 and the current detecting element BI2, and the negative electrode of the diode D1 is connected to the connection line between the trip contact 1-1 and the breaker position auxiliary contact 52 a. In this embodiment, the operation current is set in cooperation with the current detecting element BI1, so that the internal resistance of the current detecting element BI2 is set smaller, and a diode D1 is added, so that when the element of the effective protection trip contact 1-1 is closed, the power supply directly flows through the current detecting element BI2 to cause the circuit to generate heat.
The auxiliary loop comprises a logic processing unit, a power isolation unit, an alarm indication unit and a locking and closing operation control unit. The logic processing unit comprises logic OR elements and a delay function module. The input end of the logic or element is connected with action output signals of the current detection element BI1 and the current detection element BI2, the output end of the logic processing unit is connected with the power isolation unit, and the output end of the power isolation unit is respectively connected with the alarm indication unit and the locking and closing operation control unit.
The working principle of the monitoring circuit is as follows:
1) When the circuit breaker is in the open state, as shown in fig. 2, the circuit breaker position auxiliary contact 52a (1-3 element) is in the open state and the contact 52b (1-4 element) is in the closed state; at this time, the current signal flows to: power supply positive pole- & gtcurrent detection element BI1- & gtcurrent detection element BI2- & gtauxiliary contact 52 b- & gttrip coil TC- & gtpower supply negative pole. When the tripping circuit is fault-free, the current detection element BI1 and the current detection element BI2 are excited to act, and at the moment, the logic processing unit of the auxiliary circuit judges that the current detection element BI1 and the current detection element BI2 are both active, so that the tripping circuit of the circuit breaker is fault-free, does not send an alarm signal and does not block the closing operation. When any one of the auxiliary contact and the trip coil TC fails, the current loop will not be turned on, neither the current detecting element BI1 nor the current detecting element BI2 can be excited, at this time, the logic processing unit of the auxiliary loop judges that neither the current detecting element BI1 nor the current detecting element BI2 is active, which means that the circuit breaker trip loop fails, the alarm indicating unit sends out an alarm signal and the closing operation locking control unit locks the closing operation.
2) When the circuit breaker is in the closed state, as shown in fig. 3, the circuit breaker position auxiliary contact 52a (1-3 element) is in the closed state and the contact 52b (1-4 element) is in the open state; at this time, the current signal flows to: power supply positive pole → current detecting element BI1 → diode d1 → auxiliary contact 52a → trip coil TC → power supply negative pole. When the tripping circuit is fault-free, the current detection element BI1 is in an excited state, and the current detection element BI2 (1-7 elements) is in a non-triggering state, at this time, the logic processing unit of the auxiliary circuit judges that an action signal exists, which means that the tripping circuit of the circuit breaker is fault-free, does not send an alarm signal and does not block the closing operation. When any one of the auxiliary contact and the trip coil TC fails, the current loop is not conducted, the current detection element BI1 and the current detection element BI2 cannot be excited to act, at the moment, the logic processing unit of the auxiliary loop judges that no action signal exists, the fault of the trip loop of the circuit breaker is indicated, the alarm indication unit sends out an alarm signal, and the locking and closing operation control unit locks and closes the closing operation.
3) During the tripping of the circuit breaker, the auxiliary contact 52a of the circuit breaker position in the tripping circuit is in the closed state before tripping, when the tripping is performed, the tripping contact 1-1 is controlled to be closed, the tripping contact 1-1 is automatically released (automatically opened) after a set time (generally 200 ms) is normally closed, and the tripping holding current is realized inside the circuit breaker, then the current detecting element BI1 is bypassed during the closing of the tripping contact 1-1, and the current signal flows to be: the power supply anode, the normally open contact 1-1 of the tripping outlet relay, the auxiliary contact 52a, the tripping coil TC and the power supply cathode. At this time, regardless of whether the auxiliary contact 52a and the trip coil TC are failed, the current detecting elements BI1 and BI2 are in a non-triggered state, which is a normal operation state, and in order to avoid outputting a trip monitoring signal of a trip circuit failure in this case, a delay function module is provided in the logic processing unit of the auxiliary circuit to avoid false alarm. Considering the duration of this case, the delay time is generally set to 600ms.
4) Because the auxiliary contact 52a and the contact 52b of the circuit breaker have linkage property, action discrete characteristics exist in the state transition process of the linkage contact, namely, a certain transition time is required for the auxiliary contact 52a and the contact 52b to reach a final state, and a state that the two contacts are simultaneously opened exists in the transition process. During the simultaneous opening of the two contacts, both current detection elements BI1 and BI2 are in the non-activated state, typically for a time of the order of milliseconds. In order to avoid outputting tripping monitoring signals of tripping loop faults under the condition, a time delay function module is arranged in a logic processing unit of the auxiliary loop so as to avoid false alarm. Considering the duration of this case, the delay time is generally set to 600ms.
It can be seen that according to the main circuit and auxiliary circuit arrangement of the monitoring circuit in this embodiment, the full state monitoring of the trip circuit can be realized, and when the state change (fault) of the trip circuit is monitored, logic processing and alarm indication are performed, and the closing operation is performed to avoid that the circuit breaker is closed to the power transmission line fault and cannot be tripped.
The output signals of the current detection element BI1 and the current detection element BI2 are transmitted to a switch-on/off state indication module of the circuit breaker, and the switch-on/off state of the circuit breaker is judged according to the states of the current detection element BI1 and the current detection element BI2, specifically: when the current detection element BI1 has an action signal and the current detection element BI2 does not have the action signal, the circuit breaker is in a closing position state at the moment; when the current detecting elements BI1 and BI2 have the action signals, the circuit breaker is in the opening position state at the moment.
Circuit breaker tripping circuit embodiment with fault monitoring function
The tripping circuit of this embodiment includes tripping contact, circuit breaker position auxiliary contact and tripping coil that establish ties in proper order, still include the circuit breaker separating brake position detection contact with the linkage of circuit breaker position auxiliary contact, circuit breaker position auxiliary contact and circuit breaker separating brake position detection contact all are connected with the one end of tripping coil, tripping circuit still includes fault monitoring circuit, the one end of the second detection branch road of fault monitoring circuit is connected the one end that circuit breaker separating brake position detection contact was not connected with tripping coil, the tie point between tripping contact and the circuit breaker position auxiliary contact in the tripping circuit is connected to the tie point of first detection branch road and second detection branch road. The fault monitoring circuit of this embodiment adopts the fault monitoring circuit in the above embodiment, and the specific structure and working principle of the fault monitoring circuit are referred to the above fault monitoring circuit embodiment, and will not be described in detail here.
Claims (10)
1. The fault monitoring circuit of the tripping circuit of the circuit breaker is characterized by comprising a main circuit and an auxiliary circuit, wherein the main circuit comprises a first detection branch and a second detection branch, detection elements are respectively arranged in the first detection branch and the second detection branch, and the detection elements are used for acting when detecting that current flows in the branch; one end of the first detection branch is used for connecting a power supply of the tripping circuit, the other end of the first detection branch is connected with one end of the second detection branch, the connecting point is used for connecting a connecting point between a tripping contact and an auxiliary contact at the position of the breaker in the tripping circuit, and the other end of the second detection branch is used for connecting a detection contact at the breaking position of the breaker, which is linked with the auxiliary contact at the position of the breaker; the auxiliary circuit comprises a logic processing unit, wherein the input end of the logic processing unit is connected with the action signal generated by the detection element and is used for judging the tripping loop fault when no action signal is received.
2. The fault monitoring circuit of a circuit breaker trip circuit according to claim 1, wherein the main circuit further comprises a diode, an anode of the diode being connected to a connection point between the first detection branch and the second detection branch, a cathode of the diode being used to connect a connection point between a trip contact in the trip circuit and a breaker position auxiliary contact.
3. The fault monitoring circuit of a circuit breaker trip circuit according to claim 1, wherein the logic processing unit comprises a logic or element and a delay function module, wherein the input end of the logic or element is respectively connected with the action signal generated by the detection element, the output end of the logic or element is connected with the output end of the delay function module, and the delay function module is used for outputting a fault monitoring result after delaying for a set time.
4. The circuit of claim 1, wherein the logic processing unit is a CPU unit capable of implementing logic processing and delay functions.
5. The circuit of claim 1, wherein the auxiliary circuit further comprises an alarm indication unit for alerting in the event of a trip circuit failure, the alarm indication unit being coupled to an output of the logic processing unit.
6. The circuit of claim 5, wherein the auxiliary circuit further comprises a closing operation control unit for closing a closing operation in the event of a trip circuit fault, the closing operation control unit being coupled to an output of the logic processing unit.
7. The circuit of claim 5, wherein a power isolation unit is disposed between the logic processing unit and the alarm indication circuit.
8. The fault monitoring circuit of a circuit breaker trip circuit according to any one of claims 1 to 7 wherein the sensing element is a current sensing element.
9. The fault monitoring circuit of a circuit interrupter trip circuit according to claim 8, further comprising a switch-on/off position monitoring unit, wherein an input of the switch-on/off position monitoring unit is connected to an operation signal generated by the detecting element, for determining that the circuit interrupter is in a switch-on state when the detecting element in the first detecting branch is operated and the detecting element in the second detecting branch is not operated, and for determining that the circuit interrupter is in a switch-off state when the detecting elements in both the first detecting branch and the second detecting branch are operated.
10. A circuit breaker tripping circuit with fault monitoring function, the tripping circuit comprises a tripping contact, a circuit breaker position auxiliary contact and a tripping coil which are sequentially connected in series, and further comprises a circuit breaker opening position detection contact which is linked with the circuit breaker position auxiliary contact, wherein the circuit breaker position auxiliary contact and the circuit breaker opening position detection contact are both connected with one end of the tripping coil, and the circuit breaker tripping circuit is characterized by further comprising the fault monitoring circuit of the circuit breaker tripping circuit according to any one of claims 1-9, one end of a second detection branch of the fault monitoring circuit is connected with one end of the circuit breaker opening position detection contact which is not connected with the tripping coil, and a connecting point between the tripping contact and the circuit breaker position auxiliary contact in the tripping circuit is connected with a connecting point between the first detection branch and the second detection branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410230062.5A CN118199003A (en) | 2024-02-29 | 2024-02-29 | Circuit breaker tripping circuit and fault monitoring circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410230062.5A CN118199003A (en) | 2024-02-29 | 2024-02-29 | Circuit breaker tripping circuit and fault monitoring circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118199003A true CN118199003A (en) | 2024-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410230062.5A Pending CN118199003A (en) | 2024-02-29 | 2024-02-29 | Circuit breaker tripping circuit and fault monitoring circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118199003A (en) |
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2024
- 2024-02-29 CN CN202410230062.5A patent/CN118199003A/en active Pending
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