CN104753023B - A kind of Aftercurrent protecting equipment - Google Patents
A kind of Aftercurrent protecting equipment Download PDFInfo
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- CN104753023B CN104753023B CN201310752948.8A CN201310752948A CN104753023B CN 104753023 B CN104753023 B CN 104753023B CN 201310752948 A CN201310752948 A CN 201310752948A CN 104753023 B CN104753023 B CN 104753023B
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- 238000010586 diagram Methods 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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Classifications
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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
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/347—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using summation current transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/332—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means responsive to dc component in the fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a kind of Aftercurrent protecting equipment; including the first current transformer, the second current transformer, switch unit, the first residual current detection module and the second residual current detection module, the second residual current detection module includes the first detection unit and the second detection unit；The switch unit is used to switch between the first state and the second state of residue and his like protection device; so that the coil of the coil of the first current transformer and the second current transformer is connected in the first state; and the both ends of the coil group formed after series connection are connected with two input electrodes of the first residual current detection module; the coil both ends of first current transformer are made to be connected with first detection unit in the second condition, and the coil both ends of second current transformer are connected with second detection unit.The present invention can improve the sensitivity of Aftercurrent protecting equipment on the premise of Aftercurrent protecting equipment volume is not increased.
Description
Technical Field
The invention relates to a residual current protection device.
Background
The residual current protection device is widely applied to a power distribution system to guarantee personal safety. Currently, residual current protection products mainly include AC type, a type and B type. Among them, the AC type is used for detecting an AC residual current, and is mainly applied to a general AC circuit. The type a is used for detecting ac and dc pulsating residual current, and is generally applied to circuits with more electronic devices, for example: microcomputer, cash register, electronic scale, etc. Type B is used for detection of ac and dc ripple and dc smoothed residual current, and is generally applied in a smoothing dc circuit in which smoothing dc or slightly residual wave occurs when a fault occurs, for example: frequency converter, CT-equipment, X-ray equipment and uninterrupted power supply equipment. Among them, the type B residual current protection device has the best versatility, and can protect the most residual current types.
There are mature 30mA class B type residual current protection technologies that can provide residual current protection as low as 30 mA. Because the current technology is difficult to realize the detection of all types of residual currents (including alternating current and direct current pulsation and direct current smoothing) by using the same detection circuit, the B type residual current protection device is generally provided with two current transformers. Fig. 1 shows a typical type B residual current protection device, in which two current transformers (also called zero sequence current transformers) are provided, one W1 for detecting smooth dc residual current and the other W2 for detecting ac and pulsating dc residual current. When a fault event is monitored, the current transformer transmits a signal to the detection unit, a trigger instruction is sent to the trigger element after the signal passes through the judgment unit, and the trigger element uses a mechanical mechanism to disconnect the circuit to be tested. Due to the limited size of a magnetic core of the current transformer, the current B-type residual current protection device can only achieve the 30mA grade. However, in some application scenarios, for example: in humid environments or medical scenes, even residual currents less than 30mA may cause certain damage, so that the market expects more sensitive B-type residual current protection to provide better safety guarantee.
Disclosure of Invention
The invention aims to provide a B-type residual current protection solution capable of improving sensitivity on the premise of size limitation.
In one scheme of the invention, the residual current protection device comprises a first current transformer, a second current transformer, a switching unit, a first residual current detection module and a second residual current detection module, wherein the second residual current detection module comprises a first detection unit and a second detection unit;
the switching unit is configured to switch between a first state and a second state of the residual current protection device, and to: in a first state, connecting a coil of a first residual current transformer and a coil of a second residual current transformer in series, and connecting two ends of a coil group formed after the coils are connected in series with two input electrodes of the first residual current detection module; in a second state, two ends of a coil of the first current transformer are connected with the first detection unit, and two ends of a coil of the second current transformer are connected with the second detection unit;
the first residual current detection module is used for detecting residual currents in the form of alternating currents and/or pulsating direct currents, the first detection unit of the second residual current detection module is used for detecting residual currents in the form of smooth direct currents, and the second detection unit is used for detecting residual currents in the form of alternating currents and/or pulsating direct currents.
According to the scheme, the B-type residual current protection function can be realized on the premise of not increasing the volume of the residual current protection device, and the protection sensitivity of the B-type residual current protection device can be improved.
The invention further provides another scheme based on the foregoing scheme, wherein the switching unit is a switch group, the switch group includes a first switch and a second switch, and both the first switch and the second switch are double-pole double-throw switches.
Preferably, a first electrode and a second electrode of a coil of the first current transformer are respectively connected with fixed ends of a first knife and a second knife of the first switch, a first contact of the first knife of the first switch is connected with a first input electrode of the first residual current detection module, a first contact of the second knife of the first switch is connected with a first contact of the first knife of the second switch, a second contact of the first knife of the first switch is connected with a first input electrode of the first detection unit, and a second contact of the second knife of the first switch is connected with a second input electrode of the first detection unit; the first electrode and the second electrode of second current transformer's coil respectively with the stiff end of the first sword of second switch and second sword is connected, the first contact of the first sword of second switch with the first contact of the second sword of first switch is connected, the first contact of the second sword of second switch with the second input electrode of first residual current detection module is connected, the second contact of the first sword of second switch with the first input electrode of second detecting element is connected, the second contact of the second sword of second switch with the second input electrode of second detecting element is connected. In the first state, the movable ends of the first knife and the second knife of the first switch are in contact with respective first contacts, and the movable ends of the first knife and the second knife of the second switch are also in contact with respective first contacts; in the second state, the movable ends of the first blade and the second blade of the first switch are in contact with the respective second contacts, and the movable ends of the first blade and the second blade of the second switch are also in contact with the respective second contacts. This solution enables the switching unit to be implemented in a simple, practical and reliable manner.
In another aspect, the first residual current detection module includes a matching capacitor, a rectifier, an energy storage capacitor, a control switch, and a trigger signal driving circuit, and an induced signal (i.e., a residual current signal) of the current transformer passes through the matching capacitor, the rectifier, the energy storage capacitor, the control switch, and the trigger signal driving circuit in sequence. According to the scheme, on the premise of not increasing the size, the B-type residual current protection function can be realized, the protection sensitivity can be improved to 10mA level, namely, the residual current (alternating current or pulsating direct current) as low as 10mA can be detected, and the method is particularly suitable for occasions with high requirements on residual current protection, such as humid environments or medical applications.
In still another aspect, the first residual current detection module is without auxiliary power supply; and the second residual current detection module is used for carrying out auxiliary power supply on a detected circuit. The scheme widens the working mode of the B-type residual current protection device, so that the B-type residual current protection device can work in a mode with auxiliary power supply and can also work in a mode without auxiliary power supply.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
fig. 1 shows a typical type B residual current protection device of the prior art;
fig. 2 shows a schematic diagram of a model B residual current protection device module according to an embodiment of the invention;
fig. 3 shows a schematic diagram of a model B residual current protection device module according to a preferred embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Fig. 2 shows a type B residual current protection device provided according to an embodiment of the present invention, which includes a first current transformer W1, a second current transformer W2, a first switch K1, a second switch K2, a first residual current detection module without auxiliary power supply, and a second residual current detection module with auxiliary power supply. The first residual current detection module is provided with a power supply interface, and can introduce A, B, C three-phase line voltage to be tested to realize auxiliary power supply.
The first residual current detection module is used for detecting A, B, C alternating current and/or pulsating direct current residual current in the three-phase line and generating a trigger signal. The method can be directly realized by a residual current detection module in a mature A-type or AC-type residual current protection device.
The second residual current detection module comprises a first detection unit, a second detection unit and a discrimination circuit, wherein the first detection unit is used for detecting the smooth direct current residual current in the A, B, C three-phase line to be detected, and the first detection unit can be realized in a magnetic modulation mode. The second detection unit is used for detecting the tested A, B, C AC and pulsating DC residual current in the three-phase line and comprises a filtering and amplifying circuit. And the signal input judging circuits of the first detection unit and the second detection unit are used for judging whether a fault exists at present according to the received signals and generating trigger signals.
The first current transformer W1 includes a core and a coil. The first switch K1 is a double-pole double-throw switch, the first and second electrodes of the coil of the first current transformer W1 are respectively connected with the fixed ends a and b of the two poles of the first switch K1, the movable end of each pole respectively corresponds to two contacts, wherein the movable end of the first pole corresponds to the first contact c and the second contact d, and the movable end of the second pole corresponds to the first contact e and the second contact f. The first contact c of the first knife of the first switch K1 is connected with the first input electrode of the first residual current detection module, the first contact e of the second knife of the first switch K1 is connected with the first contact i of the first knife of the second switch K2, the second contact d of the first knife of the first switch K1 is connected with the first input electrode of the first detection unit, and the second contact f of the second knife of the first switch K1 is connected with the second input electrode of the first detection unit.
The second current transformer W2 also includes a core and a coil. The second switch K2 is a double-pole double-throw switch, the first and second electrodes of the coil of the second current transformer W2 are respectively connected with the fixed ends g, h of the two poles of the second switch K2, the active end of each pole respectively corresponds to two contacts, wherein the active end of the first pole corresponds to the first contact i and the second contact j, and the active end of the second pole corresponds to the first contact K and the second contact l. A first contact i of a first knife of the second switch K2 is connected with a first contact e of a second knife of the first switch K1, a first contact K of a second knife of the second switch is connected with a second input electrode of the first residual current detection module, a second contact j of the first knife of the second switch K2 is connected with a first input electrode of the second detection unit, and a second contact of the second knife of the second switch K2 is connected with a second input electrode of the second detection unit.
The first residual current detection module and the second residual current detection module are both connected with the trigger element, and the trigger element is used for breaking a circuit to be detected when receiving a trigger signal of any one of the first residual current detection module and the second residual current detection module.
The type B residual current protection device of the above embodiment has two operating modes: an unassisted power mode and an assisted power mode.
Under the non-auxiliary power supply mode (only the energy generated by the current transformer inducing the residual current is used for supplying power), the double poles of the first switch are both connected with the first contact, and the double poles of the second switch are also both connected with the first contact, so that the coils of the first current transformer and the second current transformer are connected in series and then connected into the first residual current detection module. Like this, when having alternating current or pulsation direct current residual current in being surveyed the three-phase line, this residual current is all sensed to first current transformer and second current transformer for first residual current detection module generates trigger signal, triggers and is surveyed the three-phase line and opens circuit, thereby the guarantee safety. And, because two current transformer use in series for a smaller residual current can be sensed to first residual current detection module, thereby has increased residual current protection device's sensitivity.
In an auxiliary power supply mode (not only using energy generated by a current transformer to induce residual current to supply power, but also using line voltage of a detected line to supply power) the double poles of the first switch are connected with the second contact, so that the coil of the first current transformer is connected into the first detection unit, the double poles of the second switch are connected with the second contact, so that the coil of the second current transformer is connected into the second detection unit, and the line voltage of the detected line is used for supplying power for the second detection unit in an auxiliary mode. Like this, when having smooth direct current residual current in being surveyed the circuit, first current transformer senses this residual current, handles back through first detecting element with signal transmission to discriminating circuit, and then generates trigger signal, when having interchange or the pulsating direct current residual current in being surveyed the circuit, this residual current is sensed to second current transformer, handles back through the second detecting element with signal transmission to discriminating circuit, and then generates trigger signal. Therefore, the residual current protection service of alternating current, pulsating direct current and smooth direct current can be comprehensively provided, and the B-type residual current protection function is realized.
In summary, the B-type residual current protection device of the present embodiment can realize comprehensive protection of the residual current of the alternating current, the pulsating direct current, and the smooth direct current, and can also improve the protection sensitivity of the alternating current and the pulsating direct current, and is particularly suitable for the occasions with higher requirements on residual current protection, such as humid environments or medical use. Moreover, the type B residual current protection device does not need to increase the number and the size of the magnetic cores.
Further, on the basis of the above embodiment, the present invention also provides a preferred embodiment. Fig. 3 shows a schematic block diagram of the preferred embodiment, in which the first residual current detection module, the second detection unit of the second residual current detection module and the discrimination circuit are respectively implemented in a preferred manner, the triggering element is an electromagnet L1, and the rest of the components are the same as those in the previous embodiment.
In a preferred embodiment, the first residual current detection module comprises a matching capacitor C1, a rectifier, an energy storage capacitor C2, a control switch and a trigger signal driving circuit which are cascaded. Two poles of the matching capacitor C1 are used as two poles of the first residual current detection module and connected with coils of two current transformers connected in series to form a loop, and when the two current transformers sense alternating current or pulsating direct current residual current, self-oscillation is formed in the loop, so that the output voltage at two ends of the matching capacitor C1 is increased. The output voltage of the matching capacitor C1 is provided to a rectifier for rectification, and is further connected with an energy storage capacitor C2. The energy storage capacitor C2 stores energy introduced by the residual current. The control switch is connected between the energy storage capacitor C2 and the trigger signal driving circuit, and is turned on only when the energy stored in the energy storage capacitor C2 exceeds a preset threshold value, so that the trigger signal driving circuit sends a trigger signal to the trigger element.
The second detection unit of the second residual current detection module comprises an inductor L2 and a filtering and amplifying circuit, two ends of the inductor L2 are used as signal input ports of the second detection unit, and the filtering and amplifying circuit is used for filtering and amplifying signals received by the inductor L2 and then transmitting the signals to the judgment circuit.
The discrimination circuit of the second residual current detection module comprises a cascade-connected superposition circuit, a rectification circuit, a delay circuit, a comparator and a diode D1. The superposition circuit is used for receiving the signals of the first detection unit and the second detection unit and superposing the signals. The rectifying circuit is used for converting an alternating current signal into a direct current signal, the delay circuit is used for adjusting trigger delay time, the comparator is used for judging whether the trigger signal should be sent or not so as to avoid false triggering, and the diode D1 is used for blocking potential influence of the first residual current detection module on the second residual current detection module.
The above-mentioned workflow of the preferred embodiment can refer to the foregoing, and is not described in detail. The residual current protection device of the preferred embodiment can realize the B-type residual current protection function without increasing the size, can improve the protection sensitivity to 10mA level, can detect the residual current (alternating current or pulsating direct current) as low as 10mA, and is particularly suitable for the occasions with higher requirements on residual current protection, such as humid environment or medical use, and the like.
In addition, it should be noted that the switch group formed by the first switch and the second switch in the above embodiment may be replaced by another switching unit. The switching unit can connect a coil of the first current transformer and a coil of the second current transformer in series in a first state, and connect two ends of a combined coil formed after the coils are connected in series with two input electrodes of the first residual current detection module; and in a second state, both ends of the coil of the first current transformer are connected with the first detection unit, and both ends of the coil of the second current transformer are connected with the second detection unit. The switch group can adopt various switches such as relays, triodes, switch circuits and the like.
In the above embodiment, when the second detection units of the first residual current detection module and the second residual current detection module are both used for detecting A, B, C ac and pulsating direct current residual currents in the three-phase line, the two have the same function, therefore, in terms of hardware implementation, the second detection units of the first residual current detection module and the second residual current detection module can be implemented by sharing the same detection circuit, and the detection circuit can implement the function of detecting ac and pulsating direct current residual currents. Of course, the second detection units of the first residual current detection module and the second residual current detection module can also be respectively realized by one special detection circuit, and each special detection circuit can realize the function of detecting alternating current and pulsating direct current residual currents.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (9)
1. A residual current protection device comprises a first current transformer, a second current transformer, a switching unit, a first residual current detection module and a second residual current detection module, wherein the second residual current detection module comprises a first detection unit and a second detection unit;
the switching unit is used for switching between a first state and a second state of the residual current protection device, wherein:
in a first state, a coil of a first residual current transformer and a coil of a second residual current transformer are connected in series, and two ends of a coil group formed after the coils are connected in series are connected with two input electrodes of the first residual current detection module;
in a second state, two ends of the coil of the first current transformer are connected with the first detection unit, and two ends of the coil of the second current transformer are connected with the second detection unit;
the first residual current detection module is used for detecting residual currents in the form of alternating currents and/or pulsating direct currents, the first detection unit of the second residual current detection module is used for detecting residual currents in the form of smooth direct currents, and the second detection unit is used for detecting residual currents in the form of alternating currents and/or pulsating direct currents.
2. The residual current protection device according to claim 1, wherein the switching unit is a switch bank.
3. The residual current protection device according to claim 2, wherein the switch set comprises a first switch and a second switch, and the first switch and the second switch are double pole double throw switches.
4. The residual current protection device of claim 1, wherein the first residual current detection module comprises a matching capacitor, a rectifier, an energy storage capacitor, a control switch and a trigger signal driving circuit, and the residual current signal in the first residual current detection module sequentially passes through the matching capacitor, the rectifier, the energy storage capacitor, the control switch and the trigger signal driving circuit.
5. The residual current protection device according to claim 4, wherein two electrodes of the matching capacitor are connected with two output electrodes of a coil group formed by the coils of the first current transformer and the second current transformer which are connected in series to form a loop.
6. The residual current protection device according to claim 5, wherein two electrodes of the matching capacitor are connected to the energy storage capacitor through the rectifier to charge the energy storage capacitor.
7. The residual current protection device according to claim 6, wherein the control switch is connected between the energy storage capacitor and the trigger signal driving circuit, and the control switch is turned on only when the energy stored in the energy storage capacitor exceeds a preset threshold value, so that the trigger signal driving circuit generates the trigger signal.
8. The residual current protection device according to claim 1, wherein the second residual current detection module further comprises a discrimination circuit, and the discrimination circuit is configured to receive signals of the first detection unit and the second detection unit, determine whether a fault exists currently according to the received signals, and generate a trigger signal when the fault exists.
9. The residual current protection device according to claim 1, further comprising a triggering element, wherein the triggering element is connected to the first residual current detection module and the second residual current detection module respectively, and is configured to open a circuit protected by the residual current protection device when receiving a triggering signal from any one of the first residual current detection module and the second residual current detection module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310752948.8A CN104753023B (en) | 2013-12-31 | 2013-12-31 | A kind of Aftercurrent protecting equipment |
| DE102014226968.7A DE102014226968B4 (en) | 2013-12-31 | 2014-12-23 | Residual current protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310752948.8A CN104753023B (en) | 2013-12-31 | 2013-12-31 | A kind of Aftercurrent protecting equipment |
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| CN104753023A CN104753023A (en) | 2015-07-01 |
| CN104753023B true CN104753023B (en) | 2018-01-16 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914723B (en) * | 2016-06-12 | 2019-05-03 | 上海电科电器科技有限公司 | The switching device of residual current circuit breaker |
| CN107359593A (en) * | 2017-08-30 | 2017-11-17 | 浙江巨磁智能技术有限公司 | Intelligent Type B residual current protection switch |
| CN107979066A (en) * | 2017-12-26 | 2018-05-01 | 浙江威利坚科技股份有限公司 | Type B leakage circuit breakers and its detection method |
| CN108711939B (en) * | 2018-06-08 | 2022-04-08 | 湖北锐世数字医学影像科技有限公司 | PET-CT power distribution system and method |
| CN108649570B (en) * | 2018-06-08 | 2022-04-08 | 湖北锐世数字医学影像科技有限公司 | PET-CT power distribution system and method |
| CN111781418B (en) * | 2020-06-22 | 2023-10-10 | 北京智芯微电子科技有限公司 | Low-voltage distribution network residual current monitoring method, equipment and system |
| CN111796136A (en) * | 2020-08-07 | 2020-10-20 | 广东港博新能源科技有限公司 | Power frequency residual current high-frequency component detection device and detection method thereof |
| CN115453176B (en) * | 2022-11-07 | 2023-03-24 | 南方电网数字电网研究院有限公司 | Sensitivity-switchable current mutual inductance device and current detection device |
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| EP2107662A2 (en) * | 2008-04-04 | 2009-10-07 | Doepke Schaltgeräte GmbH & Co. KG | Residual current circuit breaker device |
| CN203261004U (en) * | 2013-03-25 | 2013-10-30 | 刘圣平 | All-around anti-failure safe leakage protector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014226968A1 (en) | 2015-07-02 |
| DE102014226968B4 (en) | 2019-04-11 |
| CN104753023A (en) | 2015-07-01 |
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