CN113725805B - Switch cabinet internal fault arc protection device based on multi-signal fusion - Google Patents
Switch cabinet internal fault arc protection device based on multi-signal fusion Download PDFInfo
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- CN113725805B CN113725805B CN202110832929.0A CN202110832929A CN113725805B CN 113725805 B CN113725805 B CN 113725805B CN 202110832929 A CN202110832929 A CN 202110832929A CN 113725805 B CN113725805 B CN 113725805B
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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
- H02H1/0023—Using arc detectors sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a multi-signal fusion-based internal fault arc protection device for a switch cabinet, which comprises an arc sound detection module, an arc light detection module, a current detection module, a power supply module, a fault removal module, a communication module and a main controller. The main controller carries out logic judgment according to signals obtained by the arc sound detection module, the arc light detection module and the current detection module, and sends an action signal to the fault removal module, so that the fault removal module completes the removal action. The device reduces the use of the traditional ultraviolet light optical fiber sensor, effectively reduces the cost and wiring difficulty, greatly reduces the misjudgment rate due to the fusion logic judgment of three signals, and effectively solves the problem of protection of fault arcs in the switch cabinet.
Description
Technical Field
The invention belongs to the field of power equipment, and particularly relates to a fault arc protection device in a switch cabinet based on multi-signal fusion.
Background
In recent years, with rapid development of domestic economic construction, the power industry is also continuously developing. Due to the characteristics of small volume, convenient maintenance and the like, the medium-low voltage switch cabinet is widely applied to a medium-low voltage distribution system. Meanwhile, due to the fact that the manufacturing process and the insulation level are limited, the operation is frequent, the working environment is bad, and the like, the probability of occurrence of fault arc inside the medium-low voltage switch cabinet is greatly improved. The generation of fault arc can be accompanied by the generation of intense light and heat, which is not protected, and can further cause combustion and explosion. Can cause damage to surrounding equipment, bring serious economic loss and even threaten the life safety of staff. It can be seen that the reliable fault arc protection device in the switch cabinet has important significance for the safe operation of the power industry.
In order to solve the negative effect caused by fault arc in the switch cabinet, patent CN108281943U discloses an arc light protection device, which comprises an arc light unit, a current unit, an optical fiber temperature measuring unit, a control unit and the like. The control unit judges the arc light fault according to the comparison of the numerical values and the set values obtained by the arc light unit, the current unit and the optical fiber temperature measuring unit, and completes the fault removal. However, the patent has fewer parameters to detect, the detection method is single, and the reliability is required to be improved. Meanwhile, because more optical fiber sensors are used, the cost is high, and the wiring is complex.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a switch cabinet internal fault arc protection device based on multi-signal fusion, so as to solve the technical problems.
The invention is realized by adopting the following technical scheme:
the internal fault arc protection device of the switch cabinet based on multi-signal fusion comprises an arc sound detection module, an arc light detection module, a current detection module, a power supply module, a fault removal module, a communication module and a main controller;
the arc sound detection module is used for collecting arc sound signals in the switch cabinet in real time, and the arc sound signals are used as detection criteria to be transmitted to the main controller;
the arc light detection module is used for collecting arc light signals in the switch cabinet in real time, and the arc light signals are used as detection criteria to be transmitted to the main controller;
the current detection module is used for collecting current signals on the bus of the switch cabinet in real time, and the current signals are used as detection criteria to be transmitted to the main controller;
the fault removal module is used for receiving a command from the main controller and cutting off faults;
the communication module is used for communicating with the upper computer and receiving monitoring information from the main controller in real time;
the main controller is used for respectively receiving alarm signals of the arc sound detection module, the arc light detection module and the current detection module, and judging the logic relationship of the three signals to send out a fault cutting-off command or an abnormal warning;
and the power supply module is used for supplying power to the device.
The invention is further improved in that the arc sound detection module comprises an MEMS microphone, a first amplifying circuit, an analog-to-digital conversion circuit and a band-pass digital filter circuit; the MEMS microphone is arranged in the switch cabinet and used for detecting arc sounds generated by fault arcs; the MEMS microphone is connected with the first amplifying circuit, the first amplifying circuit is connected with the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected with the band-pass digital filter circuit, and the band-pass digital filter circuit is connected with the main controller.
The invention is further improved in that the arc light detection module comprises an ultraviolet light optical fiber sensor, a second amplifying circuit and a threshold detection circuit; the ultraviolet light optical fiber sensor is arranged at the position which is most likely to generate faults in the switch cabinet and is used for detecting arc light generated by fault arc; the ultraviolet light optical fiber sensor is connected with the second amplifying circuit, the second amplifying circuit is connected with the threshold detection circuit, and the threshold detection circuit is connected with the main controller.
The invention is further improved in that the current detection module comprises a current amplitude detection unit and a current change rate detection unit;
the current amplitude detection unit comprises a rogowski coil, a third amplifying circuit, an integrating circuit, a low-pass filter circuit and a first comparing circuit; the current change rate detection unit comprises a rogowski coil, a third amplifying circuit, a high-pass filter circuit and a second comparison circuit; the rogowski coil is arranged on a primary side wire inlet of the switch cabinet and used for detecting the current change rate when a fault arc is generated and is connected with the third amplifying circuit; the current amplitude detection unit is internally provided with a third amplifying circuit which is connected with an integrating circuit, the integrating circuit is connected with a low-pass filter circuit, the low-pass filter circuit is connected with a first comparison circuit, and the first comparison circuit is connected with a main controller; in the current change rate detection unit, the third amplifying circuit is connected with the high-pass filter circuit, the high-pass filter circuit is connected with the second comparison circuit, and the second comparison circuit is connected with the main controller.
The invention is further improved in that the fault removal module comprises a relay control circuit and a relay; the relay control circuit is connected with the relay, and the relay corresponds to the switch equipment in the control switch cabinet.
The invention is further improved in that the main controller adopts an ARM processor, and the ARM processor is connected with the communication module.
The invention is further improved in that the communication module is connected with the main controller and the upper computer.
The invention is further improved in that the arc sound detection module, the arc light detection module and the alarm signal of the current detection module are transmitted to the main controller for logic relation judgment, and the invention is specifically expressed as follows: when the current detection module sends out an alarm signal and the arc sound detection module or the arc light detection module sends out an alarm signal, judging that a fault arc occurs, and controlling the fault removal module to cut off the switch equipment by the main controller; when the arc sound detection module, the arc light detection module and the current detection module do not send out alarm signals, judging that no abnormal condition occurs; all other combined conditions generating alarms are judged to be abnormal conditions, and workers are reported through the communication of the upper computer so as to facilitate subsequent inspection and maintenance.
The invention has at least the following advantages that,
the invention provides a multi-signal fusion-based internal fault arc protection device for a switch cabinet, which is used for judging whether fault arcs occur or not mainly through three angles of arc sound, arc light and arc current change rate. According to the past experience, the ultraviolet light optical fiber sensor for arc light acquisition has higher cost and complex wiring, so the use ratio of the sensor is reduced, and the ultraviolet light optical fiber sensor is only installed at a specific position which is easy to generate arc faults. The rest positions in the switch cabinet can be provided with MEMS (micro electro mechanical system) microphones to collect sound signals when fault arcs occur, so that the cost is greatly reduced. When a fault arc is generated, the current waveform of the primary side wire inlet of the switch cabinet can generate obvious zero-break phenomenon accompanied with amplitude change, and the characteristic of current change is acquired by using a rogowski coil. The main controller carries out logic judgment according to three signals sent by the arc sound detection module, the arc light detection module and the current detection module, so that misoperation can be greatly reduced.
Drawings
FIG. 1 is a block diagram of a switchgear internal fault arc protection device based on multi-signal fusion;
FIG. 2 is a flow chart of system logic determination.
Detailed Description
The following describes the embodiments of the present invention further with reference to the accompanying drawings:
as shown in FIG. 1, the internal fault arc protection device of the switch cabinet based on multi-signal fusion provided by the invention comprises an arc sound detection module, an arc light detection module, a current detection module, a power supply module, a fault removal module, a communication module and a main controller. The arc sound detection module is used for collecting arc sound signals in the switch cabinet in real time, and the arc sound signals are used as detection criteria to be transmitted to the main controller; the arc light detection module is used for collecting arc light signals in the switch cabinet in real time, and the arc light signals are used as detection criteria to be transmitted to the main controller; the current detection module is used for collecting current signals on the bus of the switch cabinet in real time, and the current signals are used as detection criteria to be transmitted to the main controller; the fault removal module is used for receiving a command from the main controller and cutting off faults; the communication module is used for communicating with the upper computer and receiving monitoring information from the main controller in real time; the main controller carries out logic judgment according to signals obtained by the arc sound detection module, the arc light detection module and the current detection module, and sends an action signal to the fault removal module, so that the fault removal module completes the removal action.
The arc sound detection module comprises a MEMS (micro electro mechanical system) microphone, a first amplifying circuit, an analog-to-digital conversion circuit and a band-pass digital filter circuit. The MEMS (micro electro mechanical system) microphone is connected with a first amplifying circuit, the first amplifying circuit is connected with an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected with a band-pass digital filter circuit, and the band-pass digital filter circuit is connected with a main controller.
The arc light detection module comprises an ultraviolet light optical fiber sensor, a second amplifying circuit and a threshold detection circuit. The ultraviolet light sensor is connected with the second amplifying circuit, the second amplifying circuit is connected with the threshold detection circuit, and the threshold detection circuit is connected with the main controller.
The current detection module comprises a current amplitude detection unit and a current change rate detection unit. The current amplitude detection unit comprises a rogowski coil, an integrating circuit, a third amplifying circuit and a first comparing circuit. The current change rate detection unit comprises a rogowski coil, a third amplifying circuit, a high-pass filter circuit and a second comparison circuit. The Rogowski coil is connected with a third amplifying circuit, the third amplifying circuit is connected with a high-pass filter circuit, the high-pass filter circuit is connected with a comparison circuit, and the comparison circuit is connected with a main controller.
The fault removal module includes a relay control circuit and a relay. The relay control circuit is connected with the relay, and the relay corresponds to the switch equipment in the control switch cabinet.
The main controller adopts an ARM processor, is connected with the relay control circuit to lower a fault-cutting command, and is connected with the upper computer through the communication module.
The power module supplies power to the whole device.
When the device is started, the arc sound detection module, the arc light detection module and the current detection module all perform acquisition data acquisition work at the same time.
The method comprises the steps that an MEMS (micro electro mechanical system) microphone in an arc sound detection module collects arc sound signals, the sound signals are amplified through a first amplifying circuit and then are transmitted to an analog-digital conversion circuit to be converted from analog quantity to digital quantity, the digital signals of the sound are transmitted to a band-pass digital filter circuit, the band-pass digital filter circuit is subjected to specific sound frequency filtering treatment, and therefore the arc sound signals are reserved, and other irrelevant noise is filtered. When the arc sound occurs, the main controller receives a warning signal.
The ultraviolet light optical fiber sensor in the arc light detection module is used for collecting arc light signals, the sensor converts the light signals into electric signals and transmits the electric signals to the second amplifying circuit, the amplified signals are connected to the threshold detection circuit, and when the light intensity is larger than a setting threshold, warning signals are sent out.
The method comprises the following steps that a current amplitude detection unit in the current detection module performs data acquisition on the line current amplitude when an arc is generated. When a fault arc occurs, the current amplitude of the primary side wire inlet of the switch cabinet suddenly becomes large and lasts for a certain time. After the current change rate is measured through the rogowski coil, the signal is amplified through a third amplifying circuit and then is connected into an integrating circuit, and then high-frequency noise is filtered through a low-pass filter, so that the amplitude of the current signal which is transmitted into a comparison circuit can be compared with a set value. When the current amplitude exceeds the set value a plurality of times, a warning is sent to the main controller.
The method is characterized in that a current change rate detection unit in the current detection module performs data acquisition on the line current change rate when an arc is generated. When fault arc is generated, the current waveform of the primary side wire inlet of the switch cabinet can generate obvious zero rest phenomenon, the current change rate is acquired by the Rogowski coil, and the Rogowski coil can generate obvious spike signals. The signal is amplified and low frequency noise is filtered, only special high frequency spikes are retained. The signal is then transmitted to a comparator circuit which alerts the master controller when the comparator circuit determines that a continuous spike is present.
As shown in fig. 2, after receiving the alarm signals of each module, the main controller performs logic judgment to further judge whether an arc occurs, so as to reduce the false judgment rate.
It should be noted that, when the current amplitude detection unit and the current change rate detection unit in the current detection module both send out the alarm signal, the current detection module is considered to send out the alarm signal.
Specifically, when the arc sound detection module, the arc light detection module and the current detection module all send alarm signals, the main controller judges that a fault arc occurs and controls the fault removal module to cut off the switch equipment.
Specifically, when the arc sound detection module and the current detection module send out alarm signals at the same time, the main controller judges that a fault arc occurs and controls the fault removal module to cut off the switch equipment.
Specifically, when the arc light detection module and the current detection module send out alarm signals at the same time, the main controller judges that a fault arc occurs and controls the fault removal module to cut off the switch equipment.
Specifically, a certain module independently sends out an alarm signal or the arc sound detection module and the arc light detection module send out an alarm at the same time, and the main controller does not perform fault removal operation, but can send out an alarm to an upper computer through the communication module so as to facilitate equipment inspection and maintenance of staff.
The specific embodiments of the present invention have been described above by referring to the drawings, but the present invention is not limited to the above-described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (1)
1. The internal fault arc protection device of the switch cabinet based on multi-signal fusion is characterized by comprising an arc sound detection module, an arc light detection module, a current detection module, a power supply module, a fault removal module, a communication module and a main controller;
the arc sound detection module is used for collecting arc sound signals in the switch cabinet in real time, and the arc sound signals are used as detection criteria to be transmitted to the main controller; the arc sound detection module comprises an MEMS microphone, a first amplifying circuit, an analog-to-digital conversion circuit and a band-pass digital filter circuit; the MEMS microphone is arranged in the switch cabinet and used for detecting arc sounds generated by fault arcs; the MEMS microphone is connected with the first amplifying circuit, the first amplifying circuit is connected with the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected with the band-pass digital filter circuit, and the band-pass digital filter circuit is connected with the main controller;
the arc light detection module is used for collecting arc light signals in the switch cabinet in real time, and the arc light signals are used as detection criteria to be transmitted to the main controller; the arc light detection module comprises an ultraviolet light optical fiber sensor, a second amplifying circuit and a threshold detection circuit; the ultraviolet light optical fiber sensor is arranged at the position which is most likely to generate faults in the switch cabinet and is used for detecting arc light generated by fault arc; the ultraviolet light optical fiber sensor is connected with the second amplifying circuit, the second amplifying circuit is connected with the threshold detection circuit, and the threshold detection circuit is connected with the main controller;
the current detection module is used for collecting current signals on the bus of the switch cabinet in real time, and the current signals are used as detection criteria to be transmitted to the main controller; the current detection module comprises a current amplitude detection unit and a current change rate detection unit; the current amplitude detection unit comprises a rogowski coil, a third amplifying circuit, an integrating circuit, a low-pass filter circuit and a first comparing circuit; the current change rate detection unit comprises a rogowski coil, a third amplifying circuit, a high-pass filter circuit and a second comparison circuit; the rogowski coil is arranged on a primary side wire inlet of the switch cabinet and used for detecting the current change rate when a fault arc is generated and is connected with the third amplifying circuit; the current amplitude detection unit is internally provided with a third amplifying circuit which is connected with an integrating circuit, the integrating circuit is connected with a low-pass filter circuit, the low-pass filter circuit is connected with a first comparison circuit, and the first comparison circuit is connected with a main controller; the third amplifying circuit is connected with the high-pass filter circuit in the current change rate detection unit, the high-pass filter circuit is connected with the second comparison circuit, and the second comparison circuit is connected with the main controller;
the fault removal module is used for receiving a command from the main controller and cutting off faults;
the communication module is used for communicating with the upper computer and receiving monitoring information from the main controller in real time;
the main controller is used for respectively receiving alarm signals of the arc sound detection module, the arc light detection module and the current detection module, and judging the logic relationship of the three signals to send out a fault cutting-off command or an abnormal warning;
the power module is used for supplying power to the device;
the arc sound detection module, the arc light detection module and the alarm signal of the current detection module are transmitted to the main controller for logic relation judgment, and the method is specifically characterized in that: when the current detection module sends out an alarm signal and the arc sound detection module or the arc light detection module sends out an alarm signal, judging that a fault arc occurs, and controlling the fault removal module to cut off the switch equipment by the main controller; when the arc sound detection module, the arc light detection module and the current detection module do not send out alarm signals, judging that no abnormal condition occurs; all other combined conditions generating alarms are judged to be abnormal conditions, and workers are reported through the communication of the upper computer so as to facilitate the subsequent inspection and maintenance;
the fault removal module comprises a relay control circuit and a relay; the relay control circuit is connected with a relay, and the relay corresponds to switch equipment in the control switch cabinet;
the main controller adopts an ARM processor, and the ARM processor is connected with the communication module;
the communication module is connected with the main controller and the upper computer;
after receiving the alarm signals of the modules, the main controller carries out logic judgment to further judge whether an arc occurs; when the current amplitude detection unit and the current change rate detection unit in the current detection module both send out alarm signals, the current detection module is considered to send out alarm signals; when the arc sound detection module, the arc light detection module and the current detection module all send alarm signals, the main controller judges that a fault arc occurs and controls the fault removal module to cut off the switch equipment; when the arc sound detection module and the current detection module send out alarm signals at the same time, the main controller judges that a fault arc occurs and controls the fault removal module to cut off the switch equipment; when the arc light detection module and the current detection module send out alarm signals at the same time, the main controller judges that a fault arc occurs and controls the fault removal module to cut off the switch equipment; a certain module independently sends out an alarm signal or the arc sound detection module and the arc light detection module send out an alarm at the same time, the main controller does not conduct fault removal operation, but sends out an alarm to an upper computer through the communication module, so that staff can conduct equipment inspection and maintenance.
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| CN202110832929.0A CN113725805B (en) | 2021-07-22 | 2021-07-22 | Switch cabinet internal fault arc protection device based on multi-signal fusion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7403129B2 (en) * | 2006-05-10 | 2008-07-22 | Eaton Corporation | Electrical switching apparatus and method employing acoustic and current signals to distinguish between parallel and series arc faults |
| CN101902030B (en) * | 2010-07-14 | 2012-09-05 | 西安交通大学 | Detecting and positioning device of arc fault of switch apparatus |
| CN205622216U (en) * | 2016-04-20 | 2016-10-05 | 西京学院 | Intelligence arc light protection device |
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Non-Patent Citations (2)
| Title |
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| 张志强.建筑电气设备中低压开关柜弧光故障辨识方法.《石油化工建设》.2020,第42卷(第S2期),第45-48页. * |
| 王超等.开关柜内部电弧故障分析及防控措施.《河南科技》.2020,第39卷(第29期),第55-58页. * |
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