CN112398105A - Backup protector control system of surge protector and operation method thereof - Google Patents
Backup protector control system of surge protector and operation method thereof Download PDFInfo
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- CN112398105A CN112398105A CN201910754172.0A CN201910754172A CN112398105A CN 112398105 A CN112398105 A CN 112398105A CN 201910754172 A CN201910754172 A CN 201910754172A CN 112398105 A CN112398105 A CN 112398105A
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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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
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Abstract
The invention relates to a backup protector control system of a surge protector and an operation method thereof.A signal analysis control device collects signals detected by a current detection device and analyzes and judges the signals; when the lightning impulse current or the instantaneous abnormal large current is generated in the main circuit, the signal analysis control device does not trigger the electromagnetic release to make the lightning electromagnetic impulse current or the instantaneous abnormal large current flow into the ground to be released; if the surge protector breaks down and short circuit occurs when no thunder electromagnetic pulse current or instantaneous abnormal large current occurs in the main circuit, the current in the main circuit flows through the protection circuit breaker and the surge protector and enters the ground, and under the condition, the signal analysis control device triggers the magnetic release to release so as to enable the contact device to be opened, so that the main circuit, the protection circuit breaker or the surge protector and other equipment are prevented from being burnt.
Description
Technical Field
The invention relates to a backup protector control system of a surge protector and an operation method thereof.
Background
Most of the backup protector control loops of surge protectors in the current market are unstable and have low sensitivity, false operation is generated in lightning stroke, a wrong instruction is sent out, the protector is disconnected, or a tripping device does not act in power frequency set value (generally 3A), and normal protection of equipment cannot be met. The invention aims at the defects, carries out needle design and improvement and avoids similar phenomena.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a backup protector control system of a surge protector and an operation method thereof, which can protect a circuit conveniently and reliably.
In order to achieve the purpose, the invention provides a backup protector control system of a surge protector, which adopts the following technical scheme: a backup protector control system of a surge protector comprises a main circuit, a protection breaker and the surge protector, wherein the protection breaker is connected between the main circuit and the surge protector, and the surge protector is grounded;
the protection circuit breaker is provided with a current detection device, a signal analysis control device, an electromagnetic trip and a contact device, wherein the contact device is normally closed; the current detection device detects the current passing through the main conductor of the protection circuit breaker, and the signal analysis control device collects the signals detected by the current detection device and analyzes and judges the signals:
when the signal analysis control device judges that the current passing through the main lead is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device, the signal analysis control device does not trigger the electromagnetic release to act;
when the signal analysis control device judges that the current passing through the main lead is the power frequency current exceeding a set value according to the signal transmitted by the current detection device, the signal analysis control device triggers the electromagnetic release to release so as to enable the contact device to be switched off.
Preferably, the secondary current output by the zero sequence transformer supplies power to the electromagnetic trip.
Preferably, the current detection device is a zero sequence transformer sleeved outside the main conductor of the protection circuit breaker.
Preferably, the electromagnetic release is covered with a shielding cover at the outer side.
Preferably, the signal analysis control device comprises a signal identification module, a current suppression absorption module and a rectification driving module, and the current detection device transmits signals to the signal identification module; the signal identification module identifies the signal transmitted by the current detection device:
when the signal identification module judges that the current passing through the main conductor is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device, the signal is subjected to release processing by the current suppression module;
when the signal identification module judges that the current passing through the main lead is the power frequency current exceeding a set value according to the signal transmitted by the current detection device, the signal is processed by the rectification driving module and then transmitted to the electromagnetic trip to trigger tripping.
Preferably, the electromagnetic release is covered with a shielding cover at the outer side.
Preferably, the power frequency current exceeding the set value is the power frequency current passing through the main conductor of the protection circuit breaker when the power frequency current is greater than or equal to 1A.
The present invention also provides a method for operating a backup protector control system of a surge protector, corresponding to the backup protector control system of a surge protector of the present invention, the method for operating the backup protector control system of a surge protector according to the above technical solution or any preferred technical solution thereof, including the steps of:
1) the current detection device detects the current in the main conductor of the protection circuit breaker to obtain a signal and transmits the signal to the signal analysis control device;
2) the signal analysis control device judges the received signal:
2.1) when the signal analysis control device judges that the current passing through the main lead is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device, the signal analysis control device does not trigger the electromagnetic release to act;
2.2) when the signal analysis control device judges that the current passing through the main lead is the power frequency current exceeding a set value according to the signal transmitted by the current detection device, the signal analysis control device triggers the electromagnetic release to release so as to open the contact device.
Preferably, in the step 2.1), when the current passing through the main conductor of the protection circuit breaker is 10/350 μ s or 8/20 μ s lightning electromagnetic pulse current, the signal analysis control device does not trigger the electromagnetic trip.
Preferably, in the step 2.2), when the current passing through the main conductor of the protection circuit breaker is a power frequency current larger than or equal to 1A, the signal analysis control device triggers the electromagnetic release to release, so that the contact device is opened.
As described above, the backup protector control system of the surge protector and the operation method thereof according to the present invention have the following advantageous effects: when the backup protector control system of the surge protector is used, the signal analysis control device collects signals detected by the current detection device and carries out analysis and judgment; when lightning impulse current or instantaneous abnormal large current is generated in the main circuit, the signal analysis control device does not trigger the electromagnetic release, and the lightning electromagnetic impulse current or the instantaneous abnormal large current flows into the ground through the protection circuit breaker and the surge protector to be released, so that the main circuit is protected; however, if the surge protector has a fault and the main circuit is short-circuited when no lightning electromagnetic pulse current or instantaneous abnormal large current occurs, the current in the main circuit flows through the protection circuit breaker and the surge protector and enters the ground, and in this case, the signal analysis control device triggers the electromagnetic release to release, so that the contact device is opened, and the main circuit, the protection circuit breaker or the surge protector and other equipment are prevented from being burnt. Therefore, the backup protector control system of the surge protector can conveniently and reliably protect a circuit. The operation method of the backup protector control system of the surge protector of the invention has the beneficial effects, and is not described again here.
Drawings
Fig. 1a shows a schematic diagram of a back-up protector control system of a surge protector of the present invention.
Fig. 1b shows a circuit diagram of a surge protector and its control system according to the present invention.
Fig. 2 shows a schematic diagram of a protection circuit breaker.
Fig. 3 shows a schematic diagram of a current detection device, a signal analysis control device and an electromagnetic trip in a protection circuit breaker.
Description of the element reference numerals
1 main circuit
2 protective circuit breaker
3 surge protector
4 Current detection device
5 Signal analysis control device
6 electromagnetic release
7 contact device
8 main conductor
9 signal discrimination module
10 current suppressing absorption module
11 rectification drive module
12 shield cover
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1a, the present invention provides a backup protection control system of a surge protector, which comprises a main circuit 1, a protection breaker 2 and a surge protector 3, wherein the protection breaker 2 is connected between the main circuit 1 and the surge protector 3, and the surge protector 3 is grounded;
as shown in fig. 1a to 3, the protective circuit breaker 2 has a current detection device 4, a signal analysis control device 5, an electromagnetic trip 6 and a contact device 7, the contact device 7 being normally closed; the current detection device 4 detects the current passing through the main conductor 8 of the protection circuit breaker 2, and the signal analysis control device 5 collects the signals detected by the current detection device 4 and carries out analysis and judgment:
when the signal analysis control device 5 judges that the current passing through the main lead 8 is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device 4, the signal analysis control device 5 does not trigger the electromagnetic trip 6 to act;
when the signal analysis control device 5 judges that the current passing through the main conductor 8 is the power frequency current exceeding the set value according to the signal transmitted by the current detection device 4, the signal analysis control device 5 triggers the electromagnetic release 6 to release so as to open the contact device 7.
When the backup protection control system of the surge protector is used, the signal analysis control device 5 collects signals detected by the current detection device 4 and carries out analysis and judgment; when lightning impulse current or instantaneous abnormal large current is generated in the main circuit 1, the signal analysis control device 5 does not trigger the electromagnetic tripper 6 to act, and the lightning electromagnetic impulse current or the instantaneous abnormal large current flows into the ground through the protection circuit breaker 2 and the surge protector 3 to be released, so that the main circuit 1 is protected; however, if the surge protector 3 has a fault and a short circuit occurs when a lightning electromagnetic pulse current or an instantaneous abnormal large current does not occur in the main circuit 1, the current in the main circuit 1 flows through the protection breaker 2 and the surge protector 3 and enters the ground, and in this case, the signal analysis control device 5 triggers the electromagnetic release 6 to release the contact device 7, thereby preventing the main circuit 1, the protection breaker 2, the surge protector 3, and other equipment from being burnt. Therefore, the backup protection control system of the surge protector can conveniently and reliably protect the circuit.
In order to enable the signal analysis device to accurately analyze and judge the signal transmitted by the current detection device 4 and make corresponding processing, as a preferred embodiment, as shown in fig. 1a, the signal analysis control device 5 includes a signal identification module 9, a current suppression absorption module 10 and a rectification driving module 11, and the current detection device 4 transmits the signal to the signal identification module 9; the signal discrimination module 9 discriminates the signal transmitted by the current detection device 4: when the signal discrimination module 9 judges that the current passing through the main conductor 8 is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device 4, the signal is subjected to the release processing by the current suppression module; the release processing is to inhibit or attenuate the signal to the extent that the signal cannot trigger the electromagnetic release 6 to release; when the signal discrimination module 9 judges that the current passing through the main conductor 8 is the power frequency current exceeding the set value according to the signal transmitted by the current detection device 4, the signal is transmitted to the electromagnetic trip 6 after being processed by the rectification driving module 11 to trigger tripping.
In the backup protection control system of the surge protector, the signal analysis control device 5 identifies, dissipates, rectifies and the like the signal transmitted by the current detection device 4, so that the signal triggered by the instantaneous abnormal large current or the lightning electromagnetic impact current is dissipated without triggering the circuit breaker to trip and open the brake, or the signal triggered by the power frequency large current is transmitted to the electromagnetic trip after being processed by the rectifying drive module 11 to trigger the trip and open the brake. As shown in fig. 1b, wherein the current detection device 4 is a zero sequence transformer, the signal identification module 9, the current suppression absorption module 10 and the rectification driving module 11 are implemented by electronic components disposed on a circuit board, and the current detection device is used for generating a sensing signal and transmitting the signal to an input end of the circuit board; the circuit board is provided with electronic components such as a piezoresistor, a capacitor, a common mode inductor, an inductor, a transient suppression diode, a high-speed diode, a triode and other resistance capacitors, and is provided with an input port and an output port for receiving an induction signal or sending an instruction to the release; the electromagnetic trip is an actuator that trips the mechanism. Referring to fig. 1b, no matter the power frequency current, or the medium and high frequency pulse currents, an induced signal is generated at the secondary stage of the current detection device (zero sequence transformer), the induced signal is input to the circuit board for identification and processing, and when the power frequency current reaches a rated action value, the signal output from the circuit board drives the electromagnetic trip to act, so that the backup circuit breaker trips and is opened. For the lightning pulse signal, the signal is input into the circuit board and is eliminated, and the signal output from the circuit board is not enough to trigger the backup breaker to trip and open the brake. The electronic components on the circuit board can be roughly divided into the following modules:
a signal identification module: because the frequency and the voltage of an instantaneous current signal generated by lightning or instantaneous abnormal large current in a system circuit are disordered and uncontrollable, a signal identification module consisting of a piezoresistor, a transient suppression diode, a high-speed diode, a capacitor, an inductor and other electronic elements can clamp the transient signal, and the signal is clamped in a controllable range at nanosecond-level moment, so that the later-level electromagnetic release is prevented from generating misoperation. And for the power frequency current signal, the power frequency current signal can smoothly enter the rectification driving module, and is transmitted to the electromagnetic release after being processed by the rectification driving module to trigger the release and brake separation.
A current suppressing sink module: when instantaneous abnormal large current passes through, the rectifying driving module part does not completely block the pulse current signal, so that a very small part of the pulse current signal can leak to the current suppression absorption module, although the leaked part of the pulse current signal can not drive the electromagnetic release to generate misoperation, in order to improve the working reliability of the signal analysis control device, the resistance-capacitance absorption circuit is arranged on the circuit board, and the weak pulse signal flowing to the position is absorbed and released. On the other hand, the capacitor has a delay function, microsecond-level delay is caused when a driving signal flows to the electromagnetic trip, but for the circuit breaker with the action time of millisecond level, the microsecond-level delay cannot influence the action characteristic of a product;
the rectification driving module: the part converts the secondary output signal from an alternating current signal into a direct current signal, thereby being beneficial to subsequent signal processing; the circuit breaker is also provided with an electromagnetic trip, when the power frequency current exceeding a set value passes through the circuit breaker, the signal is processed by the rectifying driving module and then is input to the electromagnetic trip from the output port of the circuit board, and the electromagnetic trip executes a tripping instruction to open the circuit breaker and disconnect the circuit.
In order to avoid interference of electromagnetic signals generated by current passing through the circuit breaker on the electromagnetic release, as a preferred embodiment, the electromagnetic release is covered with a shielding cover for shielding an electromagnetic field, and the shielding cover is made of two high-permeability materials, so that the phenomenon that the circuit breaker is not operated or malfunctions due to magnetization or demagnetization caused by the electromagnetic release under the action of a large external electromagnetic field is avoided. In order to reduce power consumption, the secondary current output by the zero sequence transformer can be used for supplying power to the electromagnetic trip unit, so that the power consumption is reduced and even zero power consumption is realized.
The invention relates to a backup protection control system of a surge protector, which is formed by connecting a current detection device 4, a signal analysis control device 5 and an electromagnetic trip 6 through a lead. In a preferred embodiment, the current detecting device 4 is a zero sequence transformer sleeved outside the main conductor 8 of the protection circuit breaker 2. A secondary coil with a certain number of turns is wound around the zero sequence transformer and is used for sensing the magnitude of current in a main lead 8 passing through the protective circuit breaker 2 and providing signals for a signal analysis control device 5; the signal analysis and control device 5 is used for distinguishing high-frequency current (lightning electromagnetic pulse current or instantaneous abnormal large current is high-frequency current) and power-frequency current (current which normally works in the main circuit 1 is power-frequency current), and ensures that the protection circuit breaker 2 cannot be disconnected when the set highest high-frequency pulse current passes through the main circuit 1, so that the high-frequency current is released underground through the protection circuit breaker 2 and the surge protector 3. In a main conductor 8 of a protection circuit breaker 2, no matter power frequency current, 10/350 mu s or 8/20 mu s lightning electromagnetic impulse current with large energy flows, a current detection device 4 can generate voltage output, when the output voltage reaches a certain value, an electromagnetic release 6 can act, a signal analysis control device 5 is additionally arranged between the current detection device 4 and the electromagnetic release 6, and the power frequency current and the pulse current can be well distinguished.
If the thunder electromagnetic pulse current or the instantaneous abnormal large current occurs in the main circuit 1, the signal generated by the current detection device 4 is transmitted to the input end of the signal analysis control device 5, is identified by the signal analysis control device 5, is input into the current inhibition absorption module 10 of the signal analysis control device 5, can be inhibited, absorbed and released by electronic components on a circuit board, realizes the self digestion of the energy in the signal analysis control device 5, absorbs the input energy, and avoids mistakenly sending a tripping instruction to the electromagnetic trip 6.
If the surge protector 3 breaks down or is short-circuited due to other faults, the power frequency current in the main circuit 1 flows underground through the protection circuit breaker 2 and the surge protector 3, the device in the circuit is easily burnt by fire under the condition, in order to avoid the condition, when the current detection device 4 detects that the power frequency current passing through the main lead 8 of the protection circuit breaker 2 is greater than or equal to 1A, the signal analysis control device 5 judges the power frequency current exceeding a set value, the signal is sent to the electromagnetic trip 6 after a series of processes such as signal identification, current inhibition and absorption, rectification and the like in the signal analysis control device 5, the electromagnetic trip 6 triggers the contact device 7 of the circuit breaker to open a brake, and cuts off the current passing through the surge protector 3, so that the circuit and other equipment are protected. In order to reliably operate the electromagnetic release 6 and prevent the electromagnetic release 6 from malfunctioning due to interference of external electromagnetic signals, the electromagnetic release is covered with a shield cover 12, so that the electromagnetic release can be protected from interference of an electromagnetic field generated by a high frequency current passed through the main circuit 1.
Corresponding to the backup protection control system of the surge protector, the invention also provides an operation method of the backup protection control system of the surge protector, which performs operation by using the backup protection control system of the surge protector according to the above technical scheme or any preferable technical scheme thereof, and comprises the following steps:
1) the current detection device 4 detects the current in the main conductor 8 of the protection circuit breaker 2 to obtain a current signal and transmits the current signal to the signal analysis control device 5;
2) the signal analysis control device 5 determines the received current signal:
2.1) when the signal analysis control device 5 judges that the current passing through the main lead 8 is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device 4, the signal analysis control device 5 does not trigger the electromagnetic trip 6 to act;
2.2) when the signal analysis and control device 5 judges that the current passing through the main lead 8 is the power frequency current exceeding a set value according to the signal transmitted by the current detection device 4, the signal analysis and control device 5 triggers the electromagnetic release 6 to release so as to open the contact device 7.
The operation method of the backup protection control system of the surge protector of the present invention also has the beneficial effects of the backup protection control system of the surge protector of the present invention, and details are not repeated herein.
As for the specific judgment criteria of the lightning electromagnetic pulse current or the instantaneous abnormal large current, it may be preferable according to specific situations that, in the step 2.1), when the current passing through the main conductor 8 of the protection circuit breaker 2 is 10/350 μ s or 8/20 μ s lightning electromagnetic pulse current, the signal analysis control device 5 does not trigger the action of the electromagnetic trip 6.
The specific judgment criterion for the power frequency current exceeding the set value may be determined according to specific conditions, and preferably, in the step 2.2), when the current passing through the main conductor 8 of the protection circuit breaker 2 is a power frequency current not less than 1A, the signal analysis and control device 5 triggers the magnetic trip 6 to trip, so that the contact device 7 is opened.
Based on the technical scheme of the embodiment, the backup protection control system of the surge protector and the operation method thereof can conveniently and reliably protect a circuit, effectively improve the characteristic that the performance of a backup protection control loop of the existing surge protector 3 is unstable, not only solve the problem of magnetization of the electromagnetic release 6 by a magnetic field generated by high current such as lightning pulse and the like, avoid the performance reduction and even loss of the electromagnetic release 6 caused by an external strong magnetic field, but also reliably enable the electromagnetic release 6 to accurately act under the instruction of the signal analysis control device 5 under the condition that power frequency setting current flows through. The surge protector 3 and a main line are cut off in time, the shielding cover 12 made of the inner material and the outer material plays a role in shielding and protecting the electromagnetic release 6, so that the positive polarity lightning strike current and the negative polarity can be well protected, and the phenomenon that a switch does not act or does not act due to demagnetization or magnetization of a magnet in the electromagnetic release 6 is prevented.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A backup protector control system of a surge protector is characterized by comprising a main circuit, a protection breaker and the surge protector, wherein the protection breaker is connected between the main circuit and the surge protector, and the surge protector is grounded;
the protection circuit breaker is provided with a current detection device, a signal analysis control device, an electromagnetic trip and a contact device, wherein the contact device is normally closed; the current detection device detects the current passing through the main conductor of the protection circuit breaker, and the signal analysis control device collects the signals detected by the current detection device and analyzes and judges the signals:
when the signal analysis control device judges that the current passing through the main lead is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device, the signal analysis control device does not trigger the electromagnetic release to act;
when the signal analysis control device judges that the current passing through the main lead is the power frequency current exceeding a set value according to the signal transmitted by the current detection device, the signal analysis control device triggers the electromagnetic release to release so as to enable the contact device to be switched off.
2. A back-up protector control system for a surge protector according to claim 1, wherein: the current detection device is a zero sequence transformer sleeved on the outer side of a main conductor of the protection circuit breaker.
3. A back-up protector control system for a surge protector according to claim 2, wherein: and the secondary current output by the zero sequence transformer supplies power for the electromagnetic release.
4. A back-up protector control system for a surge protector according to claim 1, wherein: the signal analysis control device comprises a signal identification module, a current suppression absorption module and a rectification driving module, and the current detection device transmits signals to the signal identification module; the signal identification module identifies the signal transmitted by the current detection device:
when the signal identification module judges that the current passing through the main conductor is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device, the signal is subjected to release processing by the current suppression module;
when the signal identification module judges that the current passing through the main lead is the power frequency current exceeding a set value according to the signal transmitted by the current detection device, the signal is processed by the rectification driving module and then transmitted to the electromagnetic trip to trigger tripping.
5. A back-up protector control system for a surge protector according to claim 1, wherein: and when the power frequency current passing through the main lead of the protection circuit breaker is greater than or equal to 1A, the power frequency current exceeds the set value.
6. A back-up protector control system for a surge protector according to claim 1, wherein: and a shielding cover for shielding an electromagnetic field is covered on the outer side of the electromagnetic release.
7. A method of operating a surge protector backup control system for a surge protector, operating with the surge protector backup control system of any of claims 1 to 6, comprising the steps of:
1) the current detection device detects the current in the main conductor of the protection circuit breaker to obtain a signal and transmits the signal to the signal analysis control device;
2) the signal analysis control device judges the received signal:
2.1) when the signal analysis control device judges that the current passing through the main lead is the lightning electromagnetic pulse current or the instantaneous abnormal large current according to the signal transmitted by the current detection device, the signal analysis control device does not trigger the electromagnetic release to act;
2.2) when the signal analysis control device judges that the current passing through the main lead is the power frequency current exceeding a set value according to the signal transmitted by the current detection device, the signal analysis control device triggers the electromagnetic release to release so as to open the contact device.
8. The method of operating a back-up protector control system for a surge protector as claimed in claim 7, wherein: in the step 2.1), when the current passing through the main conductor of the protection circuit breaker is 10/350 mus or 8/20 mus lightning electromagnetic pulse current, the signal analysis control device does not trigger the electromagnetic trip.
9. The method of operating a back-up protector control system for a surge protector as claimed in claim 7, wherein: in the step 2.2), when the current passing through the main conductor of the protection circuit breaker is a power frequency current which is not less than 1A, the signal analysis control device triggers the electromagnetic release to release so as to enable the contact device to be switched off.
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| CN201910754172.0A CN112398105A (en) | 2019-08-15 | 2019-08-15 | Backup protector control system of surge protector and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113299525A (en) * | 2021-04-23 | 2021-08-24 | 深圳供电局有限公司 | Circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113299525A (en) * | 2021-04-23 | 2021-08-24 | 深圳供电局有限公司 | Circuit breaker |
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