CN111786373A - Arc suppression coil control system - Google Patents
Arc suppression coil control system Download PDFInfo
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- CN111786373A CN111786373A CN202010618547.3A CN202010618547A CN111786373A CN 111786373 A CN111786373 A CN 111786373A CN 202010618547 A CN202010618547 A CN 202010618547A CN 111786373 A CN111786373 A CN 111786373A
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- 230000001629 suppression Effects 0.000 title claims abstract description 114
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000007935 neutral effect Effects 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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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
- H02H3/16—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 fault current to earth, frame or mass
- H02H3/162—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 fault current to earth, frame or mass for ac systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
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Abstract
The invention discloses an arc suppression coil control system, which comprises: the input end of the arc suppression coil is electrically connected with a neutral point of the three-phase line, and the output end of the arc suppression coil is grounded; the fault detection module is coupled with the output end of the arc suppression coil and used for detecting a fault condition and sending a first signal; one end of the first control module is electrically connected with the fault detection module and used for sending a second signal according to the first signal; and one end of the second control module is coupled with the other end of the first control module, and the other end of the second control module is electrically connected with the input end of the arc suppression coil and used for controlling the connection state of the arc suppression coil according to a second signal. According to the embodiment of the invention, the fault condition of the power system is detected through the fault detection module, and the arc suppression coil is controlled to be in short circuit when the power system normally operates, so that the stable operation of the power system is ensured.
Description
Technical Field
The invention relates to the field of power systems, in particular to an arc suppression coil control system.
Background
At present, when a power system is struck by lightning or is grounded in a single-phase arc manner, the power system is easy to break down. In the related art, an arc suppression coil is connected to a neutral point of a transformer, and when a fault occurs, the arc suppression coil compensates fault current, so that ground fault is avoided, and safety of a power system is guaranteed. However, due to normal operation in the power system and other faults except single-phase arc grounding, overvoltage can be generated, so that the arc suppression coil is mistakenly considered to have a fault and repeatedly operates, and the stability of the operation of the power system is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an arc suppression coil control system which can control the arc suppression coil not to be connected into the power system when the power system normally operates so as to ensure the stable operation of the power system.
In a first aspect, an embodiment of the present invention provides an arc suppression coil control system, including: the three-phase line is used for providing power supply; the input end of the arc suppression coil is electrically connected with the neutral point of the three-phase line, and the output end of the arc suppression coil is grounded; the fault detection module is coupled with the output end of the arc suppression coil and used for detecting a fault condition and sending a first signal; one end of the first control module is electrically connected with the fault detection module and used for sending a second signal according to the first signal; and one end of the second control module is coupled with the other end of the first control module, and the other end of the second control module is electrically connected with the input end of the arc suppression coil and is used for controlling the connection state of the arc suppression coil according to the second signal.
The arc suppression coil control system provided by the embodiment of the invention at least has the following beneficial effects: the fault condition of the power system is detected through the fault detection module, when the power system normally operates, the first signal is zero, the first control module and the second control module control the arc suppression coil to be in short circuit, namely the arc suppression coil is controlled not to be connected into the power system; when the power system breaks down, the fault detection module generates voltage, namely the first signal is not zero, and the first control module and the second control module control the arc suppression coil to be connected into the power system. When circuit system breaks down, the arc suppression coil inserts in order to guarantee electric power system's safety, and electric power system normal operating, the arc suppression coil short circuit is in order to improve electric power system job stabilization nature.
According to further embodiments of the present invention, the arc suppression coil control system, the fault detection module includes: a zero line current transformer; the zero line current transformer is coupled with the output end of the arc suppression coil, and a secondary winding of the zero line current transformer is electrically connected with the first control module.
According to further embodiments of the present invention, the arc suppression coil control system, the first control module includes: a light emitting diode for transmitting a second signal; the second control module includes: the phototriode is coupled with the light emitting diode and used for receiving the second signal; the grid electrode of the MOS tube is electrically connected with the collector electrode of the phototriode, and the source electrode of the MOS tube is electrically connected with the emitter electrode of the phototriode.
According to further embodiments of the present invention, the arc suppression coil control system, the first control module further comprises: the first resistor is provided with a first end and a second end; the first end of the first resistor is electrically connected with the light emitting diode; and the second end of the first resistor is electrically connected with the zero line current transformer.
According to further embodiments of the present invention, the arc suppression coil control system, the first control module further comprises: the rectifying circuit is electrically connected with a secondary winding of the zero line current transformer; the filter circuit is electrically connected with the rectifying circuit; and one end of the voltage stabilizing circuit is electrically connected with the filter circuit, and the other end of the voltage stabilizing circuit is electrically connected with the second end of the first resistor.
According to further embodiments of the present invention, the arc suppression coil control system, the rectification circuit includes: the second resistor is electrically connected with a secondary winding of the zero line current transformer, one end of the second resistor is electrically connected with a first input end of the first rectifier bridge, and the other end of the second resistor is electrically connected with a second input end of the first rectifier bridge; the filter circuit includes: the third resistor is connected with the first capacitor in parallel, one end of the first capacitor is electrically connected with the first output end of the first rectifier bridge, and the other end of the first capacitor is electrically connected with the second output end of the first rectifier bridge; the voltage stabilizing circuit comprises: one end of the fourth resistor is electrically connected with the first output end of the first rectifier bridge, the other end of the fourth resistor is electrically connected with one end of the voltage stabilizing diode, and the other end of the voltage stabilizing diode is electrically connected with the light emitting diode.
According to further embodiments of the present invention, the arc suppression coil control system, the second control module further comprises: and a second rectifier bridge, a first input end of which is electrically connected with the input end of the arc suppression coil, a second input end of which is electrically connected with the output end of the arc suppression coil, a first output end of which is electrically connected with the drain electrode of the MOS tube, and a second output end of which is electrically connected with the source electrode of the MOS tube.
According to further embodiments of the present invention, the arc suppression coil control system, the second control module further comprises: and one end of the power supply circuit is electrically connected with the collector electrode of the phototriode, and the other end of the power supply circuit is electrically connected with the emitter electrode of the phototriode.
According to further embodiments of the present invention, the arc suppression coil control system, the second control module further comprises: one end of the fifth resistor is electrically connected with a drain electrode of the MOS tube, and the other end of the fifth resistor is electrically connected with a source electrode of the MOS tube and used for suppressing surge voltage; one end of the sixth resistor is electrically connected with a collector of the phototriode, and the other end of the sixth resistor is electrically connected with an emitter of the phototriode; one end of the seventh resistor is electrically connected with the grid electrode of the MOS tube, and the other end of the seventh resistor is electrically connected with the power supply circuit.
According to other embodiments of the arc suppression coil control system of the present invention, an output end of the arc suppression coil is electrically connected to a neutral line.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a schematic system architecture diagram of an embodiment of an arc suppression coil control system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a crowbar coil control system in an embodiment of the invention.
Reference numerals:
the fault detection device comprises a fault detection module 100, a first control module 200, a rectification circuit 210, a filter circuit 220, a voltage stabilizing circuit 230, a second control module 300 and an arc suppression coil 400.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it can be directly disposed, fixed, or connected to the other feature or indirectly disposed, fixed, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
The arc suppression coil is an inductance coil with an iron core, and is connected between a neutral point of a transformer or a generator and the ground to form an arc suppression coil grounding system. When the power system is in normal operation, no current passes through the arc suppression coil, and when the power system is struck by lightning or single-phase arc grounding occurs, the neutral point potential rises to the phase voltage, at the moment, the inductive current flowing through the arc suppression coil and the capacitive fault current of the single-phase grounding are mutually offset, so that the fault current is compensated, the residual current after compensation is very small, the phenomenon of re-ignition after the arc zero crossing is favorably prevented, the arc extinction purpose is achieved, the probability of the occurrence of high-amplitude overvoltage is reduced, the accident is prevented from being further expanded, and the safety of the power system is ensured. However, in a normal environment, the connection of the arc suppression coil may have a certain influence on the operation of the power system, for example: the accuracy of the secondary instrument measurement and the correction of relay protection are influenced. The overvoltage phenomenon can occur in various conventional operations and other faults except single-phase arc grounding in the power system, at the moment, the arc suppression coil mistakenly considers that the fault occurs, the arc suppression is carried out on the power system, the load in the power system is frequently started and stopped, and the stability of the power system is affected.
In the related art, in order to eliminate the negative effect on the power system caused by the switching-in of the arc suppression coil in the normal environment, a method for adjusting the compensation degree of the arc suppression coil is often adopted, namely, the inductance parameter of the arc suppression coil is adjusted. However, because the discreteness of the operation of the power system and the load is large, the situations of the operation and the fault are different, and the ideal effect cannot be achieved by the method of adjusting the inductance parameter of the arc suppression coil.
Based on this, this application embodiment provides an arc suppression coil control system, can solve the influence of arc suppression coil to electric power system in the normal environment, improves electric power system job stabilization nature.
Referring to fig. 1, in some embodiments, an arc suppression coil control system includes: a three-phase line U, V, W, a crowbar coil 400, a fault detection module 100, a first control module 200, and a second control module 300. The input end of the arc suppression coil 400 is electrically connected with the neutral point of the three-phase line, and the output end of the arc suppression coil 400 is grounded; the fault detection module 100 is coupled to an output end of the arc suppression coil 400, and is configured to detect a fault condition and send a first signal; one end of the first control module 200 is electrically connected to the fault detection module 100, and is configured to send a second signal according to the first signal; one end of the second control module 300 is coupled to the other end of the first control module 200, and the other end of the second control module 300 is electrically connected to an input end of the arc suppression coil 400, and is configured to control a connection state of the arc suppression coil 400 according to a second signal. Specifically, the neutral point is a point in the winding of the transformer or the generator, which is equal to the absolute value of the voltage between the external terminals. When the power system normally operates, no current passes through the arc suppression coil 400, at this time, the first signal is zero, that is, no voltage is generated by the fault detection module 100, so that the second signal sent by the first control module 200 electrically connected with the fault detection module 100 is also zero, and the second control module 300 controls the arc suppression coil 400 to be in short circuit according to the second signal, which is equivalent to the fact that the arc suppression coil 400 is not connected to a neutral point and a ground. When the power system fails, the fault detection module 100 generates a voltage, that is, the first signal is not zero, the first control module 200 generates a second signal according to the first signal and sends the second signal to the second control module 300, and the second control module 300 controls the arc suppression coil 400 to access according to the second signal, so as to ensure stable operation of the power system.
In the embodiment of the application, the fault condition of the power system is detected by the fault detection module 100, when the power system normally operates, the first signal is zero, and the first control module 200 and the second control module 300 control the arc suppression coil 400 to be in short circuit, that is, control the arc suppression coil 400 not to be connected into the power system; when the power system has a fault, the fault detection module 100 generates a voltage, that is, the first signal is not zero, and the first control module 200 and the second control module 300 control the arc suppression coil 400 to be connected to the power system. When the circuit system breaks down, the arc suppression coil 400 is connected to ensure the safety of the power system; when the power system operates normally, the arc suppression coil 400 is short-circuited to improve the stability of the power system.
Referring to fig. 2, in some embodiments, the fault detection module 100 includes: the zero line current transformer T1, the zero line current transformer T1 and the output end of the arc suppression coil 400 are coupled, and the secondary winding L1 of the zero line current transformer T1 is electrically connected with the first control module 200. A zero line current transformer T1 is provided at the output of the arc suppression coil 400 to detect the current at which the zero line loop actually operates. The zero line current transformer T1 can realize high-precision and high-sensitivity detection, specifically, the precision can reach 0.2 level, and the zero line current transformer T1 can convert grounding current between dozens of milliamperes and dozens of amperes. When the power system has a fault, the secondary winding L1 of the zero line current transformer T1 can induce a voltage large enough to transmit the voltage signal to the first control module 200, so that the second control module 300 controls the arc suppression coil 400 to be connected to the power system, thereby ensuring the safety of the power system. In a specific embodiment, the neutral current transformer T1 is disposed at the output end of the arc suppression coil 400, and may be a cable connected to the output end of the arc suppression coil 400 and passing through an inner hole of an iron core of the neutral current transformer T1 as shown in fig. 2, or a neutral current transformer T1 is fixed by a fixing member such as an insulating clip to the cable at the output end of the arc suppression coil 400, so as to realize the coupling connection of the neutral current transformer T1 and the output end of the arc suppression coil 400.
In some embodiments, the first control module 200 includes: a light emitting diode U1A for sending a second signal, the second control module 300 comprising: the phototriode U1B and the MOS tube V1, the phototriode U1B is coupled with the light emitting diode U1A and is used for receiving a second signal, the grid electrode of the MOS tube V1 is electrically connected with the collector electrode of the phototriode U1B, and the source electrode of the MOS tube V1 is electrically connected with the emitter electrode of the phototriode U1B. Specifically, the MOS transistor V1 is an N-channel field effect transistor, the light emitting diode U1A is an infrared light emitting diode U1A, the phototransistor U1B is an infrared phototriode U1B, and the infrared light emitting diode U1A is coupled to the infrared phototriode U1B, when the power system fails, an induced voltage is generated at two ends of a secondary winding L1 of the zero line current transformer T1, so that the infrared light emitting diode U1A generates a second signal, that is, the infrared light emitting diode U1A sends an infrared light signal, the phototriode U1B receives the infrared light signal, the phototriode U1B is turned on, and the MOS transistor V1 is turned off, so that the arc suppression coil 400 is normally connected to the power system, and safety of the power system during the failure is ensured. When the power system normally operates, no inductive voltage is generated in the secondary winding L1 of the zero line current transformer T1, the infrared diode does not emit light, the phototriode U1B is cut off, and the MOS tube V1 is conducted, so that the arc suppression coil 400 is short-circuited, and the stable operation of the power system under the normal condition is ensured.
In some embodiments, the first control module 200 further comprises: the first resistor RP1 and the first resistor RP1 are provided with a first end and a second end, the first end of the first resistor RP1 is electrically connected with the light emitting diode U1A, and the second end of the first resistor RP1 is electrically connected with the neutral current transformer T1. Specifically, the first resistor RP1 is an adjustable resistor, and is used to adjust the influence of the voltage generated at the two ends of the secondary winding L1 of the zero line current transformer T1 on the light emitting diode U1A, and the resistance of the first resistor RP1 is adjusted to control the light emitting diode U1A to generate a second signal when the induced voltage value is large, that is, the arc suppression coil 400 is controlled to be connected to the power system when the induced voltage value is large, so as to increase the applicability of the control system of the arc suppression coil 400.
In some embodiments, the first control module 200 further comprises: the rectifier circuit 210 is electrically connected with a secondary winding L1 of the zero line current transformer T1, the filter circuit 220 is electrically connected with the rectifier circuit 210, one end of the voltage stabilizing circuit 230 is electrically connected with the filter circuit 220, and the other end of the voltage stabilizing circuit 230 is electrically connected with a second end of the first resistor RP 1. In a specific embodiment, the rectifier circuit 210 includes: the second resistor R2 and the first rectifier bridge VC1, the second resistor R2 is electrically connected with a secondary winding L1 of the zero line current transformer T1, one end of the second resistor R2 is electrically connected with a first input end of the first rectifier bridge VC1, and the other end of the second resistor R2 is electrically connected with a second input end of the first rectifier bridge VC 1. The filter circuit 220 includes: the third resistor R3 and the first capacitor C1 are connected in parallel, the third resistor R3 and the first capacitor C1 are connected in parallel, one end of the first capacitor C1 is electrically connected with the first output end of the first rectifier bridge VC1, and the other end of the first capacitor C1 is electrically connected with the second output end of the first rectifier bridge VC 1. The voltage stabilizing circuit 230 includes: one end of the fourth resistor R4 is electrically connected with the first output end of the first rectifier bridge VC1, the other end of the fourth resistor R4 is electrically connected with one end of a voltage stabilizing diode VD1, and the other end of the voltage stabilizing diode VD1 is electrically connected with the light emitting diode U1A. Specifically, when a fault occurs in the power system, voltages are generated at two ends of the secondary winding L1 of the zero line current transformer T1, the voltages are rectified by the rectification circuit 210, filtered by the filter circuit 220, and stabilized by the voltage stabilizing circuit 230, and then input to two ends of the light emitting diode U1A to provide power supply voltages for the light emitting diode U1A, and when the voltages generated at two ends of the secondary winding L1 of the zero line current transformer T1 are sufficiently large, the light emitting diode U1A sends out a second signal to control the conduction of the phototriode U1B, so that the MOS transistor V1 is turned off, and the arc suppression coil 400 is controlled to be connected into the power system.
In some embodiments, the second control module 300 further comprises: a first input end of the second rectifier bridge VC2 is electrically connected with an input end of the arc suppression coil 400, a second input end of the second rectifier bridge VC2 is electrically connected with an output end of the arc suppression coil 400, a first output end of the second rectifier bridge VC2 is electrically connected with a drain electrode of the MOS tube V1, and a second output end of the second rectifier bridge VC2 is electrically connected with a source electrode of the MOS tube V1. Specifically, when the power system normally operates, the light emitting diode U1A generates a second signal, the phototransistor U1B is turned off, the MOS transistor V1 is turned on, and the arc suppression coil 400 is short-circuited through the second rectifier bridge VC2 to ensure stable operation of the power system.
In some embodiments, the second control module 300 further comprises: and one end of the power supply circuit is electrically connected with the collector electrode of the phototriode U1B, and the other end of the power supply circuit is electrically connected with the emitter electrode of the phototriode U1B. Specifically, the power supply circuit is used for providing a 12V direct current power supply, the positive electrode of the power supply circuit is electrically connected with the collector of the phototransistor U1B and the gate of the MOS transistor V1, and the negative electrode of the power supply circuit is electrically connected with the emitter of the phototransistor U1B and the source of the MOS transistor V1. When the power system normally operates, the phototriode U1B is cut off, the MOS tube V1 is conducted, the arc suppression coil 400 is in short circuit through the second rectifier bridge VC2, and the fact that no arc suppression coil 400 is connected into the power system is equivalent to the fact that no arc suppression coil 400 is connected into the power system. When the power system breaks down, the phototriode U1B is conducted, the grid voltage of the MOS tube V1 is pulled low, and the MOS tube V1 is cut off, so that the arc suppression coil 400 is controlled to be connected into the power system, and the safety of the power system is guaranteed.
In some embodiments, the second control module 300 further comprises: the circuit comprises a fifth resistor RV5, a sixth resistor R6 and a seventh resistor R7, wherein one end of the fifth resistor RV5 is electrically connected with the drain electrode of the MOS transistor V1, and the other end of the fifth resistor RV5 is electrically connected with the source electrode of the MOS transistor V1, so that surge voltage is suppressed, and the MOS transistor V1 is protected. One end of the sixth resistor R6 is electrically connected to the collector of the phototransistor U1B, the other end of the sixth resistor R6 is electrically connected to the emitter of the phototransistor U1B, one end of the seventh resistor R7 is electrically connected to the collector of the MOS transistor V1, and the other end of the seventh resistor R7 is electrically connected to the positive electrode of the power supply circuit.
In some embodiments, the input end of the arc suppression coil 400 is electrically connected to the neutral point N of the three-phase line T0, and the output end of the arc suppression coil 400 is grounded and electrically connected to the neutral line PE. The zero line current transformer T1 is coupled with the output end of the arc suppression coil 400 and is used for detecting the working current of the zero line loop.
In a specific embodiment, when the power system normally operates, no voltage is generated at two ends of the secondary winding L1 of the zero line current transformer T1, the light emitting diode U1A does not emit light, the phototriode U1B is turned off, the MOS transistor V1 is turned on, and the arc suppression coil 400 is short-circuited through the second rectifier bridge VC2 to ensure stable operation of the power system in a normal state. When the power system breaks down, the two ends of the secondary winding L1 of the zero line current transformer T1 generate voltage, the light emitting diode U1A emits light signals, the phototriode U1B is conducted, the grid voltage of the MOS tube V1 is pulled low, and the MOS tube V1 is cut off, so that the arc suppression coil 400 is controlled to be normally connected into the power system, and the safety of the power system when the power system breaks down is guaranteed. Since the change of the state of the photoelectric coupler only needs microsecond-level response time, when the power system breaks down, the arc suppression coil 400 can be connected in time to ensure the safety of the power system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. Arc suppression coil control system, its characterized in that includes:
the three-phase line is used for providing power supply;
the input end of the arc suppression coil is electrically connected with the neutral point of the three-phase line, and the output end of the arc suppression coil is grounded;
the fault detection module is coupled with the output end of the arc suppression coil and used for detecting a fault condition and sending a first signal;
one end of the first control module is electrically connected with the fault detection module and used for sending a second signal according to the first signal;
and one end of the second control module is coupled with the other end of the first control module, and the other end of the second control module is electrically connected with the input end of the arc suppression coil and is used for controlling the connection state of the arc suppression coil according to the second signal.
2. The arc suppression coil control system of claim 1, wherein said fault detection module comprises: a zero line current transformer;
the zero line current transformer is coupled with the output end of the arc suppression coil, and a secondary winding of the zero line current transformer is electrically connected with the first control module.
3. The arc suppression coil control system of claim 2, wherein the first control module comprises: a light emitting diode for transmitting a second signal;
the second control module includes: the phototriode is coupled with the light emitting diode and used for receiving the second signal;
the grid electrode of the MOS tube is electrically connected with the collector electrode of the phototriode, and the source electrode of the MOS tube is electrically connected with the emitter electrode of the phototriode.
4. The arc suppression coil control system of claim 3, wherein said first control module further comprises: the first resistor is provided with a first end and a second end;
the first end of the first resistor is electrically connected with the light emitting diode;
and the second end of the first resistor is electrically connected with the zero line current transformer.
5. The arc suppression coil control system of claim 4, wherein said first control module further comprises:
the rectifying circuit is electrically connected with a secondary winding of the zero line current transformer;
the filter circuit is electrically connected with the rectifying circuit;
and one end of the voltage stabilizing circuit is electrically connected with the filter circuit, and the other end of the voltage stabilizing circuit is electrically connected with the second end of the first resistor.
6. The arc suppression coil control system according to claim 5, wherein the rectification circuit comprises: a second resistor and a first rectifier bridge;
the second resistor is electrically connected with a secondary winding of the zero line current transformer, one end of the second resistor is electrically connected with a first input end of the first rectifier bridge, and the other end of the second resistor is electrically connected with a second input end of the first rectifier bridge;
the filter circuit includes: a third resistor and a first capacitor;
the third resistor is connected with the first capacitor in parallel, one end of the first capacitor is electrically connected with the first output end of the first rectifier bridge, and the other end of the first capacitor is electrically connected with the second output end of the first rectifier bridge;
the voltage stabilizing circuit comprises: a fourth resistor and a zener diode;
one end of the fourth resistor is electrically connected with the first output end of the first rectifier bridge, the other end of the fourth resistor is electrically connected with one end of the voltage stabilizing diode, and the other end of the voltage stabilizing diode is electrically connected with the light emitting diode.
7. The arc suppression coil control system of claim 3, wherein said second control module further comprises:
and a second rectifier bridge, a first input end of which is electrically connected with the input end of the arc suppression coil, a second input end of which is electrically connected with the output end of the arc suppression coil, a first output end of which is electrically connected with the drain electrode of the MOS tube, and a second output end of which is electrically connected with the source electrode of the MOS tube.
8. The arc suppression coil control system of claim 7, wherein said second control module further comprises:
and one end of the power supply circuit is electrically connected with the collector electrode of the phototriode, and the other end of the power supply circuit is electrically connected with the emitter electrode of the phototriode.
9. The arc suppression coil control system of claim 8, wherein said second control module further comprises:
one end of the fifth resistor is electrically connected with a drain electrode of the MOS tube, and the other end of the fifth resistor is electrically connected with a source electrode of the MOS tube and used for suppressing surge voltage;
one end of the sixth resistor is electrically connected with a collector of the phototriode, and the other end of the sixth resistor is electrically connected with an emitter of the phototriode;
one end of the seventh resistor is electrically connected with the grid electrode of the MOS tube, and the other end of the seventh resistor is electrically connected with the power supply circuit.
10. An arc suppression coil control system according to any one of claims 1 to 9, wherein an output end of said arc suppression coil is electrically connected to a neutral line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618547.3A CN111786373B (en) | 2020-06-30 | 2020-06-30 | Arc suppression coil control system |
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