CN112271705A - Arc light fault protection system and switch cabinet - Google Patents
Arc light fault protection system and switch cabinet Download PDFInfo
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- CN112271705A CN112271705A CN202011219925.7A CN202011219925A CN112271705A CN 112271705 A CN112271705 A CN 112271705A CN 202011219925 A CN202011219925 A CN 202011219925A CN 112271705 A CN112271705 A CN 112271705A
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
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- 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
- H02H1/0015—Using arc detectors
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Abstract
The invention relates to the technical field of power equipment, in particular to an arc fault protection system and a switch cabinet, which comprise: the control device comprises an arc light detection module and a processing module; the arc light detection module is used for detecting arc lights in the load loop and the switch cabinet; the processing module comprises an arc fault signal receiving unit and a processing unit, wherein the arc fault signal receiving unit is used for receiving an arc fault signal, and the processing unit sends a short-circuit instruction according to the arc fault signal; the short-circuit device is used for transferring the load loop to the earth loop according to the short-circuit instruction. The arc light detection module monitors whether arc light faults occur in the load circuit and the switch cabinet, when the arc light faults occur in the load circuit, the control device controls the short-circuit device to rapidly transfer the load circuit with the arc light faults to the ground circuit, and the fault circuit is cut off from the power system by the main circuit breaker, so that overvoltage damage caused by the arc light faults is avoided.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to an arc light fault protection system and a switch cabinet.
Background
The overvoltage moments of operation, interception, resonance, lightning stroke and the like of the power system threaten the insulation of electrical equipment and the safe operation of the power system, wherein the single-phase intermittent arc grounding overvoltage is the most serious, and the instantaneous amplitude of the single-phase arc grounding overvoltage can reach 20.4KV to the maximum. If the arc grounding causes intermittent and repetitive burning of the arc at the grounding point, the overvoltage multiple generated is much greater than 2.3 times. According to the introduction of related data, some experts in foreign countries have actually measured the single-phase arc grounding, and the overvoltage amplitude is 3-3.5 times higher than that of the normal phase voltage. Therefore, once the high overvoltage is generated, flashover discharge is formed in a weak insulation link of the power network, and the insulation is damaged in serious conditions, so that interphase short circuit is caused or electric equipment is damaged.
The power system is often changed into multi-phase grounding due to single-phase arc grounding, and large-area power failure of the power system is caused by accident enlargement caused by untimely treatment. Especially, the problem of burning the explosion cabinet caused by intermittent arc grounding overvoltage is prominent. Meanwhile, the device is used for solving the problem that toxic gas is released from the cabinet body and the cable insulating material due to intermittent arc grounding in closed occasions such as ships, mines and the like, and seriously threatens the production and life of personnel. Intermittent arc ground shorts are often insufficient to cause a protective relay action because the current is small.
Disclosure of Invention
The problem that when arc grounding fault occurs, a fault circuit cannot be timely disconnected from a main circuit to damage an electric power system is solved.
To solve the above technical problem, one aspect of the present application discloses an arc fault protection system, comprising: a control device and a short-circuit device,
the control device comprises an arc light detection module and a processing module;
the arc light detection module is used for detecting arc lights in the load loop and the switch cabinet;
the processing module comprises an arc fault signal receiving unit and a processing unit, wherein the arc fault signal receiving unit is used for receiving an arc fault signal, and the processing unit sends a short-circuit instruction according to the arc fault signal;
the short-circuit device is used for transferring the load circuit to the earth circuit and disconnecting the load circuit from the main circuit according to the circuit breaking instruction.
Furthermore, the short-circuit device is a quick switching-on circuit breaker, the quick switching-on circuit breaker comprises a first terminal and a second terminal, the first terminal is used for being connected with a main circuit breaker in the load circuit, and the second terminal is connected with the ground;
the quick switching-on circuit breaker can conduct a bus in the load loop with the ground to form a grounding short circuit according to the circuit breaking instruction; and a relay protection device in the load circuit sends a protection instruction according to the current generated by the grounding short circuit, and the protection instruction is used for disconnecting the main circuit breaker.
Furthermore, the quick closing circuit breaker comprises a quick repulsion mechanism and an arc extinguish chamber, the quick repulsion mechanism drives the closing and opening of the quick closing circuit breaker, and the arc extinguish chamber is used for eliminating arc light generated when the quick closing circuit breaker is disconnected.
Further, the arc detection module includes an arc analysis unit that detects an arc by arc spectroscopic analysis; and/or the presence of a gas in the gas,
the control device further comprises a warning module, and the warning module is used for sending warning information according to the arc fault signal.
Furthermore, the control device further comprises a voltage and current measurement and control module, and the voltage and current measurement and control module is used for monitoring the voltage and the current in the load loop.
Further, the processing unit sends a short-circuit instruction according to the arc fault signal when the voltage and the current in the load loop are in preset conditions.
Further, the preset condition is that the voltage to ground of the load circuit is greater than a rated phase voltage, and the current value of the load circuit is less than kI; and k is a current coefficient, and I is a rated short-circuit current value designed for the load loop.
Another aspect of the application discloses a switch cabinet, including the cabinet body, the internal arc fault protection system that is equipped with as above of cabinet.
Furthermore, a cable chamber, a main circuit breaker and a measurement and control chamber are also arranged in the cabinet body,
a third wiring terminal is arranged in the cable chamber and is used for connecting a bus with the main circuit breaker respectively;
one end of the main breaker is connected with the third wiring terminal, and the other end of the main breaker is respectively connected with a load and the breaking device;
and a voltage and current measurement and control module is arranged in the measurement and control chamber and used for monitoring the voltage and the current in the load loop.
Furthermore, the switch cabinet further comprises a wall bushing, and the bus enters the cable chamber through the wall bushing.
Adopt above-mentioned technical scheme, this application arc light fault protection system and cubical switchboard have following beneficial effect:
this application arc light fault protection system, whether arc light trouble appears in arc light detection module monitoring load circuit, when arc light trouble appears in load circuit, controlling means control circuit breaker cuts off the load circuit that arc light trouble appears rapidly in following electric power system to the overvoltage harm that arc light trouble leads to has been avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic wiring diagram of a circuit breaker according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a switch cabinet according to an embodiment of the present application;
fig. 3 is a flowchart of a working method of a switch cabinet according to an embodiment of the present application.
Description of the drawings:
101-arc light detection module; 102-a processing module; 110-fast closing circuit breaker; 201-cabinet body; 202-main breaker; 203-a measurement and control room; 204-cable chamber; 205-an electrical room; 206-wall bushing; 301-bus bar; 302-load out line.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the present application. In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
Along with the large-scale technical transformation of urban and rural power networks in China, the urban and rural power distribution networks must be developed in a directional cabling way, the capacitance current to ground of the system is gradually increased, and the problem of arc light grounding overvoltage is increasingly serious. In order to solve the problems, a resonance grounding mode is adopted in many power grids, namely an arc suppression coil is arranged in the power grids, when a system generates single-phase arc grounding, inductive current generated by the arc suppression coil is used for compensating capacitance current of a fault point, residual current flowing through the fault point is reduced, and natural arc suppression is achieved. Practical operation experience proves that equipment damage and accidents affecting system operation safety caused by single-phase arc grounding overvoltage of a power grid with a neutral point grounded through an arc suppression coil still occur occasionally.
The embodiment of the application provides an arc fault protection system, which is used for quickly cutting off a load loop with an arc fault from a power system, thereby avoiding overvoltage damage caused by the arc fault. The system comprises:
the device comprises a control device and a short-circuit device, wherein the control device comprises an arc light detection module 101 and a processing module 102; the arc detection module 101 is used for detecting the arc occurring in the load loop; the processing module 102 comprises an arc fault signal receiving unit and a processing unit, wherein the arc fault signal receiving unit is used for receiving an arc fault signal, and the processing unit sends a short-circuit instruction according to the arc fault signal; the short-circuit device is used for transferring the load loop to the earth loop according to the short-circuit instruction and disconnecting the load loop from the main loop.
The arc fault protection system of the embodiment of the application, whether arc fault appears in the load circuit is monitored to arc detection module 101, and when arc fault appears in the load circuit, controlling means control circuit breaker will appear the load circuit of arc fault and transfer to the ground return circuit rapidly and amputate from electric power system by main circuit breaker to the overvoltage harm that arc fault leads to has been avoided.
In the embodiment of the present application, the arc detecting module 101 is capable of detecting whether an arc fault occurs in a circuit within a working range thereof, and optionally, the arc fault detecting module may determine whether an arc fault occurs in the monitored circuit by monitoring a change in a characteristic value of the circuit, such as a change in current and voltage, a change in an electromagnetic field, and the like; optionally, the arc fault detection module may further determine whether the arc fault occurs in the circuit monitored by the arc fault detection module by capturing an arc generated when the arc fault occurs in the circuit. Arc detection module 101 and communication connection processing module 102, when arc detection module 101 detects the circuit and takes place the arc fault to processing module 102 feedback arc fault signal, processing module 102 sends the short circuit instruction to the short-circuit device according to the arc fault signal that receives, and the short-circuit device receives the short circuit instruction and moves the return circuit that takes place the arc fault and shift to the ground return circuit and break by main circuit breaker to realize the peeling off of fault circuit. Optionally, the processing module 102 is an entity capable of performing one or more logical contact tasks within the scope defined by the interface under the particular circumstances. Optionally, the processing module 102 is an Intelligent Electronic Device (IED). The short-circuit device is a device capable of receiving a short-circuit instruction, enabling the load loop to be in short circuit with the earth loop according to the short-circuit instruction and achieving fault circuit disconnection. The short-circuit device is a device capable of short-circuiting a load circuit, for example, a circuit breaker device has one end connected to a bus 301 of the load circuit and one end connected to the ground, and when an arc fault occurs in the circuit, the circuit breaker device is closed to form a ground short circuit and generate a large current, so that a relay protection device in the load circuit is triggered to send a protection command, and a fault circuit is stripped from a power system.
The short-circuit device is a quick switching-on circuit breaker 110, the quick switching-on circuit breaker 110 comprises a first terminal and a second terminal, the first terminal is used for being connected with a main circuit breaker 202 in a load loop, and the second terminal is connected with the ground; the quick closing circuit breaker 110 can conduct a bus 301 in a load loop with the ground to form a ground short circuit according to a short circuit instruction; the relay protection device in the load circuit sends a protection instruction according to the current generated by the ground short circuit, and the protection instruction is used for disconnecting the main circuit breaker 202.
Fig. 1 is a schematic wiring diagram of a short-circuit device provided in an embodiment of the present application, and as shown in fig. 1, the short-circuit device is a quick-closing circuit breaker 110, a first terminal of the quick-closing circuit breaker 110 is connected to a main circuit breaker 202 in a load circuit, one end of the main circuit breaker 202 is connected to a bus 301, the other end of the main circuit breaker 202 is connected to a load outgoing line 302 and a first terminal of the quick-closing circuit breaker 110, and a second terminal of the quick-closing circuit breaker 110 is connected to ground. Through the wiring mode, when the control device detects that the arc fault occurs in the loop, a short circuit instruction is sent, the rapid closing circuit breaker 110 performs closing action after receiving the short circuit instruction, the rapid closing circuit breaker 110 is closed within an extreme time such as 2ms, at the moment, the load loop is short-circuited to the ground, the loop forms large short circuit current, the relay protection device sends a protection instruction to operate the main circuit breaker 202 to open, the main circuit breaker 202 opens after receiving the instruction, and the short circuit fault in the loop is rapidly removed, so that the arc fault circuit is stripped from the power system.
The rapid closing circuit breaker 110 includes a rapid repulsion mechanism and an arc extinguish chamber, the rapid repulsion mechanism drives the rapid closing circuit breaker 110 to close and open, and the arc extinguish chamber is used for eliminating arc light generated when the rapid closing circuit breaker 110 is disconnected.
In this embodiment, the quick closing circuit breaker 110 further includes a signal receiving unit, configured to receive a short circuit instruction. After the rapid closing circuit breaker 110 of the rapid repulsion mechanism receives the short circuit instruction, the rapid repulsion mechanism can rapidly drive the rapid closing circuit breaker 110 to close. The fast repulsion mechanism can also drive the fast closing circuit breaker 110 to open, and whether the fast closing circuit breaker 110 opens or not is determined according to the state of a fault loop, namely the fast repulsion mechanism drives the fast closing circuit breaker 110 to open after the main circuit breaker 202 opens. Specifically, the main breaker 202 is opened after a certain delay, for example, 10ms, and the quick closing breaker 110 is opened. The arc extinguish chamber can rapidly extinguish arc and restrain current after the arc extinguish chamber is used for cutting off a power supply of a high-voltage circuit, thereby avoiding accidents and accidents.
The arc detection module 101 includes an arc analysis unit that detects an arc by arc spectroscopic analysis; and/or, the control device also comprises a warning module, and the warning module is used for sending warning information according to the arc fault signal.
In the embodiment of the application, the arc fault detection module is used for judging whether the monitored circuit has the arc fault or not by capturing the arc generated when the circuit has the arc fault. The arc analysis unit in the arc detection module 101 realizes the capture of the arc phenomenon by using arc spectral analysis. Whether arc fault takes place in the return circuit is judged according to the testing result of arc light detection module 101 to control module, if arc fault takes place in the return circuit, processing module 102 sends the instruction of closing a floodgate for rapid closing circuit breaker 110 immediately, warning module among the controlling means then sends warning information simultaneously, and is optional, and warning information can be speech information, like alarm bell etc. can be video information like arc phenomenon etc. warning information that warning module sent can instruct at the fault scene, also can send to remote monitoring personnel.
The control device also comprises a voltage and current measurement and control module which is used for monitoring the voltage and the current in the load loop.
In the embodiment of the application, in order to ensure the stable operation of the loop, the voltage and current measurement and control module monitors whether the voltage and the current in the loop are within the range of the normal working interval or not in real time. Optionally, a display unit may be further disposed in the voltage and current measurement and control module, and the display unit may display the monitored voltage and current values and the real-time fluctuation curve of the voltage and current in real time.
And the processing unit sends a short-circuit instruction according to the arc fault signal when the voltage and the current in the load loop are in preset conditions.
In the embodiment of the present application, in order to improve the detection precision of the loop arc fault and avoid causing erroneous judgment, the processing module 102 further needs to refer to the voltage value and the current value in the load loop when sending the short-circuit instruction, and when the voltage value and the current value are in the range of the abnormal operating interval, the processing unit sends the short-circuit instruction when the arc detection module 101 detects the arc.
The preset condition is that the voltage to ground of a load circuit is greater than a rated phase voltage, and the current value of the load circuit is less than kI; wherein k is a current coefficient, and I is a rated short-circuit current value designed for a load loop.
In the embodiment of the present application, when the arc detection module 101 detects an arc, a loop current value is smaller than kI, and a loop voltage to ground is larger than a rated phase voltage, the processing module 102 sends a breaking instruction, and the quick closing circuit breaker 110 operates. Wherein k is a current coefficient, and needs to be set in combination with loop parameters, which can be usually 0.1-0.3, and I is a rated short circuit current value designed for the loop. The arc detection module 101 does not detect arc, and even if the current value of the loop is smaller than kI and the voltage to ground of the loop is larger than the rated phase voltage, the processing module 102 does not send a short circuit command, and the quick closing circuit breaker 110 does not operate.
The embodiment of the present application further provides a switch cabinet, and fig. 2 is a schematic structural diagram of the switch cabinet provided in the embodiment of the present application, and as shown in fig. 2, the switch cabinet includes a cabinet body 201, and the arc fault protection system as described above is arranged in the cabinet body 201.
In the embodiment of the present application, an arc fault protection system is disposed in the cabinet body 201 of the lighting cabinet, and for the specific implementation of the arc fault protection system, reference is made to all the manners of the arc fault protection system described above.
The switch cabinet is provided with an arc fault protection system. The switch cabinet can realize arc short circuit, intermittent arc short circuit grounding protection and arc overvoltage protection, is particularly suitable for closed environments such as naval vessels, mines, station houses and the like, and is applied to application scenes with strict requirements on the concentration of toxic gases in the space.
A cable chamber 204, a main circuit breaker 202 and a measurement and control chamber 203 are further arranged in the cabinet body 201, a third terminal is arranged in the cable chamber 204, and the third terminal is used for connecting a bus 301 with the main circuit breaker 202 respectively; one end of the main breaker 202 is connected with the third terminal, and the other end is respectively connected with the load and the short-circuit device; and a voltage and current measurement and control module is arranged in the measurement and control chamber 203 and is used for monitoring the voltage and the current in the load loop.
In the embodiment of the present application, the switch cabinet is connected in series between the bus 301 and the load outgoing line 302, and optionally, the bus 301 is an 10/35kV bus 301. The switch cabinet is internally provided with a main breaker 202, the main breaker 202 is close to the side of a bus 301, one connecting terminal of the main breaker 202 is connected with the bus 301, the other connecting terminal is connected with a load outgoing line 302, the quick switching-on breaker 110 is connected between the main breaker 202 and the ground in series, a first terminal of the quick switching-on breaker 110 is connected with the connecting terminal of the main breaker 202 connected with the load, and a second terminal of the quick switching-on breaker 110 is connected with the ground. When arc light fault occurs in the switch cabinet, the rapid switching-on circuit breaker 110 is switched on, a short circuit channel is formed, a load outgoing line 302 generates large short circuit current, the large short circuit current is judged to act on the main circuit breaker 202 through a relay protection device, and the main circuit breaker 202 breaks the short circuit current, so that fault circuit isolation is realized.
As an embodiment, as shown in fig. 2, the switch cabinet is a handcart type switch cabinet, and is composed of a cabinet body 201, a main circuit breaker 202 handcart, which is a three-phase circuit breaker, a measurement and control chamber 203, a cable chamber 204, a wall bushing 206, an arc fault protection system and the like. Optionally, the cabinet 201 is a standard KYNA28-12 or KYNA61-40.5 type cabinet 201, and is used for fixing and installing a three-phase circuit breaker handcart, an arc fault protection system and other accessory devices. The three-phase circuit breaker, i.e., the main circuit breaker 202, is a common three-phase high-voltage ac circuit breaker, and is used for breaking a short-circuit current in a loop and closing a rated current in the loop. The cable room 204 is used for in-station cable wiring. The wall bushing 206 is used for insulation protection when the short-circuit switch cabinet is connected with the 10/35kV bus 301 of the transformer substation in parallel. The wall bushing 206 and the wire terminals are disposed within an electrical compartment 205, the electrical compartment 205 being located in an upper-middle portion of the back of the cabinet 201. The arc fault protection system comprises a control device and a circuit breaker, wherein the control device comprises an arc detection module 101, a voltage and current measurement and control module and a processing module 102, and the arc detection module 101 realizes the capture of an arc phenomenon by utilizing arc spectrum analysis. The voltage and current measurement and control module is used for displaying and recording voltage values, current and overvoltage waveforms. Optionally, the voltage and current measurement and control module is disposed in the measurement and control chamber 203 and connected to the processing module 102 through wired or wireless communication. The warning module is arranged in the measurement and control chamber 203, and if the arc fault occurs in the loop, the warning module in the control device sends out warning information. The processing module 102 combines the analysis result of the arc detection module 101 and the voltage and current information of the measurement and control chamber 203 to realize the judgment of the arc result and send an action instruction to the circuit breaking device. As an example, the short-circuit device is a quick-closing circuit breaker 110, the quick-closing circuit breaker 110 is composed of a quick repulsive mechanism and an arc extinguish chamber, and the closing speed of the quick-closing circuit breaker 110 is required to be within 2 ms.
In the embodiment of this application, the three-phase circuit breaker handcart is located cabinet 201 openly below, and quick combined floodgate circuit breaker 110 is located cabinet 201 openly middle part, observes and controls room 203 and is located cabinet 201 front upper portion, and cable chamber 204 is located cabinet 201 upper portion behind, and wall bushing 206 is located cabinet 201 upper portion in the back. The 10/35kV bus 301 three-phase enters the cabinet body 201 through the wall bushing 206 and is connected with an upper outgoing line of a three-phase circuit breaker handcart, a lower outgoing line of the three-phase circuit breaker handcart is connected with an upper outgoing line of the rapid switch-on circuit breaker 110, and a lower outgoing line of the rapid switch-on circuit breaker 110 is connected with the ground.
In an embodiment of the present application, fig. 3 is a flowchart of a working method of a switch cabinet provided in the embodiment of the present application, and as shown in fig. 3, the working method of the switch cabinet includes: when the main circuit breaker 202 is closed in normal operation, the rapid closing circuit breaker 110 is disconnected, the arc light detection module 101 in the switch cabinet analyzes arc light spectrum in real time, the processing module 102 comprehensively judges whether arc light fault occurs in a loop or not by combining arc light fault signals of the arc light detection module 101 and current and voltage values sent by the voltage and current measurement and control module, if yes, a closing instruction is immediately sent to the rapid closing circuit breaker 110, meanwhile, a warning module in the measurement and control chamber 203 also sends warning sound, after the closing instruction is received, the rapid closing circuit breaker 110 is closed within 2ms, at the moment, a wire loop is led out, namely, a bus 301 reaches the main circuit breaker 202 and then reaches the rapid closing circuit breaker 110 and a loop formed by grounding, ground short circuit occurs, large short circuit current is formed in the loop, a relay protection instruction is sent by a relay protection device to act on the opening of the main circuit breaker 202, and the, the short circuit fault of the loop is cut off rapidly. A certain delay after the main breaker 202 is opened can be generally selected to be 10ms when the quick closing breaker 110 is opened. The criterion for the processing module 102 to determine whether the arc fault occurs in the loop includes: when the arc light detection module 101 detects arc light, the current value of the loop is less than kI, and the voltage of the loop to ground is greater than the rated phase voltage, the circuit breaker is closed to act; wherein k is a current coefficient, and needs to be set in combination with loop parameters, which can be usually 0.1-0.3, and I is a rated short circuit current value designed for the loop. The arc detection module 101 does not detect arc, the current value of the loop is smaller than kI, the voltage of the loop to ground is larger than the rated phase voltage, and the closing circuit breaker does not act.
In the embodiment of the application, an arc light fault protection system is provided, the arc light detection module 101 monitors whether an arc light fault occurs in a load loop, when the arc light fault occurs in the load loop, the control device controls the short-circuit device to rapidly transfer the load loop with the arc light fault to the ground to form a short circuit, and the short circuit device is cut off from the power system by the main circuit breaker, so that overvoltage damage caused by the arc light fault is avoided. The embodiment of the application also provides a switch cabinet structure form and an installation and arrangement mode by combining the arc light fault protection system, and the switch cabinet is particularly suitable for closed environments such as naval vessels, mines and station houses and the like and has strict requirements on the concentration of toxic gas in the space.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An arc fault protection system, comprising: a control device and a short-circuit device,
the control device comprises an arc detection module (101) and a processing module (102);
the arc light detection module (101) is used for detecting arc lights in a load circuit and a switch cabinet;
the processing module (102) comprises an arc fault signal receiving unit and a processing unit, wherein the arc fault signal receiving unit is used for receiving an arc fault signal, and the processing unit sends a short-circuit instruction according to the arc fault signal;
the short-circuit device is used for transferring the load circuit to the earth circuit and disconnecting the load circuit from the main circuit according to the short-circuit instruction.
2. The arc fault protection system of claim 1, wherein the shorting device is a quick-close circuit breaker (110), the quick-close circuit breaker (110) comprising a first terminal for connection to a main circuit breaker (202) in the load circuit and a second terminal connected to ground;
the rapid switching-on circuit breaker (110) can conduct a bus (301) in the load circuit with the ground to form a grounding short circuit according to the short circuit instruction; and a relay protection device in the load circuit sends a protection instruction according to the current generated by the grounding short circuit, and the protection instruction is used for disconnecting the main circuit breaker (202).
3. The arc fault protection system of claim 2, wherein the rapid closing circuit breaker (110) comprises a rapid repulsion mechanism and an arc extinguish chamber, the rapid repulsion mechanism drives the rapid closing circuit breaker (110) to close and open, and the arc extinguish chamber is used for eliminating arc light generated when the rapid closing circuit breaker (110) is opened.
4. The arc fault protection system of claim 1, wherein the arc detection module (101) comprises an arc analysis unit that detects an arc by arc spectral analysis; and/or the presence of a gas in the gas,
the control device further comprises a warning module, and the warning module is used for sending warning information according to the arc fault signal.
5. The arc fault protection system of claim 4, wherein the control device further comprises a voltage current measurement and control module for monitoring voltage and current in the load loop.
6. The arc fault protection system of claim 5, wherein the processing unit sends a short circuit command based on the arc fault signal when the voltage and current in the load loop are at preset conditions.
7. The arc fault protection system of claim 6, wherein the preset condition is the load circuit voltage to ground being greater than a nominal phase voltage, the load circuit current value being less than kI; and k is a current coefficient, and I is a rated short-circuit current value designed for the load loop.
8. A switchgear cabinet characterized by comprising a cabinet body (201), wherein the arc fault protection system of any one of claims 1-7 is arranged in the cabinet body (201).
9. The switch cabinet according to claim 8, characterized in that a cable chamber (204), a main breaker (202) and a measurement and control chamber (203) are further arranged in the cabinet body (201),
a third terminal is arranged in the cable chamber (204) and is used for connecting a bus (301) with the main circuit breaker (202) respectively;
one end of the main breaker (202) is connected with the third terminal, and the other end of the main breaker is respectively connected with a load and the breaking device;
and a voltage and current measurement and control module is arranged in the measurement and control chamber (203) and is used for monitoring the voltage and the current in a load loop.
10. The switchgear cabinet according to claim 9, further comprising a wall bushing (206), wherein the bus bar (301) enters the cable compartment (204) through the wall bushing (206).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219925.7A CN112271705A (en) | 2020-11-04 | 2020-11-04 | Arc light fault protection system and switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219925.7A CN112271705A (en) | 2020-11-04 | 2020-11-04 | Arc light fault protection system and switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112271705A true CN112271705A (en) | 2021-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011219925.7A Pending CN112271705A (en) | 2020-11-04 | 2020-11-04 | Arc light fault protection system and switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112271705A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993461A (en) * | 2015-06-23 | 2015-10-21 | 江苏金智科技股份有限公司 | Relay protection device providing electric arc light protection function |
| CN206283125U (en) * | 2016-12-28 | 2017-06-27 | 广东金颖电气设备有限公司 | Switch cubicle with arc protection mechanism |
| CN211046469U (en) * | 2019-11-15 | 2020-07-17 | 国网江苏省电力有限公司南京供电分公司 | Arc light rapid protection device |
| CN211089128U (en) * | 2019-07-23 | 2020-07-24 | 苏州华欣瑞电力技术有限公司 | Intelligent arc light protection device |
| CN111610467A (en) * | 2020-05-19 | 2020-09-01 | 上海舒盈科技股份有限公司 | Switch cabinet capable of automatically detecting contact engagement state and detection method thereof |
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2020
- 2020-11-04 CN CN202011219925.7A patent/CN112271705A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993461A (en) * | 2015-06-23 | 2015-10-21 | 江苏金智科技股份有限公司 | Relay protection device providing electric arc light protection function |
| CN206283125U (en) * | 2016-12-28 | 2017-06-27 | 广东金颖电气设备有限公司 | Switch cubicle with arc protection mechanism |
| CN211089128U (en) * | 2019-07-23 | 2020-07-24 | 苏州华欣瑞电力技术有限公司 | Intelligent arc light protection device |
| CN211046469U (en) * | 2019-11-15 | 2020-07-17 | 国网江苏省电力有限公司南京供电分公司 | Arc light rapid protection device |
| CN111610467A (en) * | 2020-05-19 | 2020-09-01 | 上海舒盈科技股份有限公司 | Switch cabinet capable of automatically detecting contact engagement state and detection method thereof |
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Application publication date: 20210126 |