CN112531642B - Residual current protection circuit and residual current protection device - Google Patents
Residual current protection circuit and residual current protection device Download PDFInfo
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- CN112531642B CN112531642B CN202011389678.5A CN202011389678A CN112531642B CN 112531642 B CN112531642 B CN 112531642B CN 202011389678 A CN202011389678 A CN 202011389678A CN 112531642 B CN112531642 B CN 112531642B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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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- 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
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention discloses a residual current protection circuit and a residual current protection device, wherein the residual current protection circuit comprises an MCU (microprogrammed control unit), a residual current sampling circuit, a residual current test circuit and a trip coil disconnection detection and drive circuit; the residual current protection device comprises a detection element, an MCU, an execution element and a detection element. The invention can be applied to any type of residual current protection, the MCU drives the self-checking residual current, the actual residual current and the test signal can be directly judged, the periodic self-checking of the zero-sequence mutual inductor and the sampling circuit is completed, and the circuit breaker does not need to actually trip; the tripping signal output can adopt an intermittent delay-stopped pulse output driving mode, so that a tripping coil can be effectively protected under the condition of reverse incoming line, and an executing element is prevented from being damaged due to long-term energization; the circuit breaker on-off state can be detected, and after the circuit breaker trips, the actuating element does not output driving signals any more.
Description
Technical Field
The invention relates to a residual current protection circuit and a residual current protection device, and belongs to the field of residual current protection circuit breakers.
Background
The residual current operated protective device is a switch device with an electric leakage protection function, the IEC standard is named as a residual current operated protective device, which is abbreviated as RCO, and the national standard makes it clear that the residual current operated protective device is used for operating the protective device for cutting off the power supply of the fault line and the electrical equipment when the single-phase earth fault occurs on the electrical line and the electrical equipment. The residual current protection circuit breaker is a protection device which assembles a residual current protection device and a low-voltage circuit breaker in an insulating shell.
The residual current protection device in the current market is mostly realized by adopting a special chip, and the special chip has the advantages of simple peripheral circuit, mature scheme and reliable protection. The disadvantages are also apparent as follows:
1) The protection is relatively fixed, and different types of residual current protection need to be realized by adopting different special chips.
2) The actual tripping and power failure are needed in the test operation, and a branch circuit is needed to be arranged on the occasion needing continuous power supply to ensure the continuous power supply during the test, so that the wiring is complex.
3) The connection mode of the reverse wire is not supported. Because the conventional residual current protection device generally takes electricity at the wire outlet end, namely tripping is the power failure. The actuator is not operated after tripping. However, if a reverse incoming line is adopted, after the breaker trips, the actuator is still electrified, and if the actuator is electrified for a long time, the actuator is damaged due to overheating.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing residual current protection device has the problems that the protection is relatively fixed, the detection and test operation needs actual tripping and power off, and the connection mode of reverse incoming lines is not supported.
In order to solve the above problems, the technical solution of the present invention is to provide a residual current protection circuit, which is characterized in that: the residual current testing circuit comprises an external testing circuit and an internal self-checking circuit, the trip coil disconnection detecting and driving circuit comprises a trip coil disconnection detecting circuit and a trip coil driving circuit, and induced leakage current is generated through a zero sequence transformer;
the output end of the residual current sampling circuit is connected with the residual current sampling signal input end of the MCU, the MCU collects induced leakage current generated by an external test circuit through the residual current sampling circuit, and after the induced leakage current signal is judged, the MCU outputs a pulse tripping signal of intermittent delay stop to the tripping coil driving circuit to drive the circuit breaker to trip so as to complete external leakage current test; the output end of the tripping coil disconnection detection circuit is connected with the tripping coil disconnection monitoring signal input end of the MCU, and the MCU judges whether the tripping coil has a disconnection fault or not by monitoring the output level of the tripping coil disconnection detection circuit;
the MCU sends a driving signal to the internal self-checking circuit to control the internal self-checking circuit to generate induction leakage current, the induction leakage current of the internal self-checking circuit is collected through the residual current sampling circuit, at the moment, the MCU does not output a tripping signal, and self-checking of the residual current sampling circuit and the zero sequence transformer is completed.
Preferably, the external test circuit comprises a zero sequence transformer, a current limiting resistor R1, a diode D10 and a key switch SW1, and the internal self-checking circuit comprises a zero sequence transformer, a current limiting resistor R1, a diode D10 and a self-checking control switch device Q1; one end of the current-limiting resistor R1 is connected with a phase voltage, the other end of the current-limiting resistor R1 is connected with a test input end of a zero sequence transformer, a test output end of the zero sequence transformer is respectively connected with one end of a key switch SW1 and one end of a self-checking control switch device Q1 through a diode D10, the other ends of the key switch SW1 and the self-checking control switch device Q1 are grounded, and a driving electrode of the self-checking control switch device Q1 is connected with a driving signal output end of the MCU; the two ends of the key switch SW1 are connected with a key jitter elimination circuit in a bridging mode, and a filter circuit is connected between the self-checking control switch device Q1 and the reference ground in a bridging mode.
Preferably, the residual current sampling circuit comprises a sampling resistor RL, a bidirectional parallel diode D9, a proportional amplifying circuit and an output filter circuit, wherein two ends of the sampling resistor RL are connected with an induced current output end of the zero sequence transformer, the bidirectional parallel diode D9 is connected with the sampling resistor RL in parallel and then connected with the proportional amplifying circuit, and the proportional amplifying circuit amplifies a residual current sampling signal and then connects the amplified residual current sampling signal with a residual current sampling signal input end of the MCU through the output filter circuit.
Preferably, the proportional amplifying circuit comprises an operational amplifier U1, a resistor R4, a resistor R5, a resistor R6 and a resistor R7, the input end of the operational amplifier U1 is connected with a capacitor C3 in parallel, the reverse input end of the operational amplifier U1 is respectively connected with one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R4 is connected with one end of a bidirectional parallel diode D9, the other end of the resistor R6 is respectively connected with the output end of the operational amplifier U1 and an output filter circuit, and two ends of the resistor R6 are connected with the capacitor C4 in parallel;
the positive input end of the operational amplifier U1 is respectively connected with one end of a resistor R5 and one end of a resistor R7, the other end of the resistor R5 is connected with the other end of a bidirectional parallel diode D9, the other end of the resistor R7 is connected with a reference voltage Vref, and two ends of the resistor R7 are connected with a capacitor C5 in parallel.
Preferably, the trip coil driving circuit comprises a three-phase full-bridge rectifying circuit, a mosfet q2, a resistor R11 and a capacitor C7, wherein the anode of the three-phase full-bridge rectifying circuit is connected with the incoming line of the trip coil, the cathode of the three-phase full-bridge rectifying circuit is grounded, the outgoing line of the trip coil is respectively connected with the input end of the trip coil disconnection detection circuit and the drain electrode of the mosfet q2, the output end of the trip coil disconnection detection circuit is connected with the trip coil disconnection monitoring signal input end of the MCU, the source electrode of the mosfet q2 is grounded, the gate electrode of the trip coil is connected with the trip signal output end of the MCU, one end of the resistor R11 is connected with the gate electrode of the mosfet q2, the other end of the resistor R11 is connected with the reference ground, and the C7 is connected with the resistor R11 in parallel to play a filtering role.
Preferably, the trip coil disconnection detection circuit comprises a resistor R9, a resistor R10, a diode D8 and a capacitor C7, wherein one end of the resistor R9 is connected with an outgoing line of the trip coil, the other end of the resistor R9 is connected with one end of the resistor R10 and a cathode of the diode D8, the other end of the resistor R10 and an anode of the diode D8 are connected with a reference ground, the capacitors C7 and R10 are connected in parallel to play a filtering role, and a cathode of the diode D8 is connected with a trip coil disconnection monitoring signal input end of the MCU.
Another technical solution of the present invention is to provide a residual current protection device, wherein the residual current protection circuit as described above is applied, and the residual current protection device includes:
the detection element is used for detecting a residual current signal of a circuit or electrical equipment and transmitting the detected residual current signal to the MCU;
the MCU samples the actual residual current in real time, compares the real-time sampling value with a set value, and sends a driving signal to the execution element according to the set delay time when the actual residual current value is higher than the set value, and the execution element controls the switch to trip;
the executive component immediately cuts off the power supply after receiving the signal transmitted by the MCU;
and the inspection element simulates a residual current signal by using external inspection operation and a self-inspection signal sent by the MCU to inspect the quality of the residual current protection device.
Compared with the prior art, the invention has the beneficial effects that:
1) The method is applicable to any type of residual current protection because the method adopts AD sampling to judge the residual current.
2) The switch device in the self-checking circuit is driven by the MCU to generate self-checking residual current, the actual residual current and a test signal can be directly judged in the mode, periodic self-checking of the zero-sequence transformer and the sampling circuit is completed, and the circuit breaker does not need to be actually tripped but warns a user whether the current equipment works normally or not in an indicator light mode.
3) Both the forward incoming line and the backward incoming line can be supported. The MCU controls the execution element, the tripping signal output can adopt an intermittent delay stop pulse output driving mode, a tripping coil can be effectively protected under the condition of reverse wire inlet, and the execution element is prevented from being damaged due to long-term electrification.
4) The circuit breaker on-off state can be detected, and after the circuit breaker trips, the actuating element does not output driving signals any more.
Drawings
FIG. 1 is a schematic diagram of a residual current protection device according to the present invention;
FIG. 2 is a schematic diagram showing the connection relationship between the MCU of the residual current protection circuit and other circuits;
FIG. 3 is a circuit diagram of a residual current test;
FIG. 4 is a circuit diagram of residual current sampling;
fig. 5 is a circuit diagram of the trip coil breakage detection and driving circuit.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Fig. 2 is a schematic diagram showing a connection relationship between the central processing unit MCU of the residual current protection circuit and other circuits, wherein the MCU input signals include a residual current sampling signal, a trip coil disconnection detection signal, a residual current setting, and a delay setting. The output signal comprises a trip signal output and a self-checking signal output. Because the single chip microcomputer is adopted to output the tripping signal, the output mode of the signal can adopt intermittent pulse type output, and the mode can effectively protect the tripping coil from being burnt down due to long-term electrification under the condition of reverse incoming line.
Fig. 3 shows a residual current test circuit. Including external test circuitry and internal self-test circuitry. The external test circuit is implemented by an external key switch SW 1. The testing circuit comprises a current limiting resistor R1, wherein one end of the current limiting resistor R1 is connected with the phase voltage, and the other end of the current limiting resistor R1 is connected with the testing input end of the zero sequence transformer; the test output end of the zero sequence transformer is connected with the anode of a rectifier diode D10, the cathode of the D10 is connected with one end of a key switch SW1, and the other end of the key switch SW1 is connected with the ground. The resistor R2 and the capacitor C1 are connected in series and bridged at two ends of the key switch SW1 to form a key jitter elimination circuit.
The connection mode and the circuit of the internal self-checking circuit are that one end of a current limiting resistor R1 is connected with a phase voltage, and the other end of the current limiting resistor R1 is connected with a test input end of a zero sequence transformer; the test output end of the zero sequence transformer is connected with the anode of a rectifier diode D10, the cathode of the D10 is connected with a self-checking control switch device Q1, the driving pole of the Q1 is connected with the driving output (self-checking signal) of the MCU, and a resistor R3 and a capacitor C2 are connected in parallel and then bridged between a Q1 driving stage and the ground to play a role in filtering.
Fig. 4 shows a residual current sampling circuit. The induced current output end of the zero sequence transformer is connected with the two ends of the sampling resistor RL, and the current signal is converted into a voltage signal. A bi-directional parallel diode D9 is connected in parallel with RL as a voltage clamp. The operational amplifier U1 and the resistors R4, R5, R6 and R7 together form a proportional amplification circuit, and the proportional amplification circuit is used for carrying out proportional amplification on the residual current sampling signal. One end of the R4 is connected with one end of the sampling resistor RL, and the other end of the R4 is connected with the inverting input end of the operational amplifier U1; one end of the R5 is connected with the other end of the sampling resistor RL, and the other end of the R5 is connected with the positive input end of the operational amplifier U1. One end of the R6 is connected with the inverting input end of the operational amplifier U1, and the other end is connected with the output end of the operational amplifier U1. One end of the R7 is connected to the positive input terminal of the operational amplifier U1, and the other end is connected to a reference voltage (Vref). Capacitors C4 and C5 act as a filter, where C4 is connected in parallel with R6 and C5 is connected in parallel with R7. And R8 and C6 are used as an output filter circuit of the operational amplifier, wherein one end of R8 is connected with the output end of the operational amplifier, and the other end of R8 is connected with the residual current sampling input of the MCU. One end of the C6 is connected with the residual current sampling input of the MCU, and the other end of the C6 is connected with the reference ground.
Fig. 5 shows a circuit for detecting and driving the open circuit of the trip coil. Wherein D1-D6 form a three-phase full-bridge rectification circuit. After rectification, the positive pole is connected with one end of the trip coil, and the negative pole is connected with the reference ground. The broken line detection circuit consists of a resistor R9, a resistor R10, a voltage stabilizing diode D8 and a capacitor C7, wherein one end of the R9 is connected with an outgoing line of the trip coil, and the other end of the R9 is connected with one end of the R10 and the cathode of the voltage stabilizing diode D8. The other end of R10 and the anode of D8 are connected to a reference ground. C7 and R10 are connected in parallel to play a role in filtering. And the cathode of the D8 is connected with the wire breakage detection signal input end of the trip coil of the MCU. The tripping driving circuit consists of a MOSFET Q2, a resistor R11 and a capacitor C7. The drain of the MOSFET Q2 is connected with the wire outlet end of the trip coil, the source is connected with the reference ground, and the grid is connected with the trip signal output end of the MCU. And one end of R11 is connected with the grid electrode of Q2, and the other end is connected with the reference ground. C7 is connected with R11 in parallel and plays a role in filtering.
The principle of the residual current external test circuit is as follows: when SW1 in fig. 3 is pressed down, phase voltage passes through a current limiting resistor R1, a simulation leakage current is injected into the test input end of the zero sequence transformer, at the moment, the MCU senses the leakage current through a residual current acquisition circuit shown in fig. 4, a tripping signal is sent out, the tripping signal output of the MCU adopts pulse output of intermittent delay stop, and a tripping coil driving circuit shown in fig. 5 drives a circuit breaker to trip, so that the external leakage test is completed.
The working principle of the internal self-checking circuit of the residual circuit is as follows: the MCU sends out a self-detection signal at regular time to a control electrode of Q1 shown in figure 3 to control the switching device to be conducted, at the moment, phase voltage passes through the current-limiting resistor R1, a simulation leakage current is injected into the test input end of the zero-sequence transformer, at the moment, the MCU senses the leakage current through the residual current collecting circuit shown in figure 4, and the MCU knows that the leakage current signal is generated by self-detection test, so that a tripping driving signal cannot be actually sent out. The self-checking of the zero-sequence mutual inductor and the sampling circuit is completed.
The principle of detecting the disconnection of the trip coil in fig. 5 is as follows: when the trip coil is normal, the rectified voltage can sequentially pass through the trip coil, R9 and R10, a high potential is input at the input end of the trip coil disconnection detection of the MCU, and the detection of the high potential by the MCU means that the trip coil is normal. When the trip coil is disconnected, the loop is disconnected at the moment, the input end of the trip coil disconnection detection of the MCU is pulled down to the reference ground through the R10 and is at a low potential, and the MCU detects the low potential to mean that the trip coil is disconnected and has a fault. The self-checking of the trip coil is completed.
As shown in fig. 1, a residual current protection device according to the present invention employs the above-mentioned residual current protection circuit, which includes:
the detection element is used for detecting a residual current signal of a circuit or electrical equipment and transmitting the detected residual current signal to the MCU;
and the MCU is used for sampling the actual residual current in real time and comparing the real-time sampling value with a set value. When the actual residual current value is higher than the set value, the MCU sends a driving signal to the execution element according to the set delay time, and the execution element controls the switch to trip. Because the executing element can complete the switch tripping operation only by a pulse signal, the driving signal output of the MCU can be set to be an intermittent pulse, so that reliable tripping can be ensured, and the executing element can not be damaged under the condition of long energization of a reverse incoming line.
The executive component immediately cuts off the power supply after receiving the signal transmitted by the MCU;
and the inspection element simulates a residual current signal by using external inspection operation and a self-inspection signal sent by the MCU to inspect the quality of the residual current protection device.
The invention has the function of self-checking the equipment, namely, besides the external checking operation, the MCU can send out the checking signal by itself at regular time to check whether the detection element and the executive element work normally. Different from the external test operation, the MCU self-test does not need the switch to trip, so that the load outage caused by the external self-test is avoided.
Claims (6)
1. A residual current protection circuit, characterized by: the residual current testing circuit comprises an external testing circuit and an internal self-checking circuit, the trip coil disconnection detecting and driving circuit comprises a trip coil disconnection detecting circuit and a trip coil driving circuit, and induced leakage current is generated through a zero sequence transformer;
the output end of the residual current sampling circuit is connected with the residual current sampling signal input end of the MCU, the MCU collects induced leakage current generated by an external test circuit through the residual current sampling circuit, and after the induced leakage current signal is judged, the MCU outputs a pulse tripping signal of intermittent delay stop to the tripping coil driving circuit to drive the circuit breaker to trip so as to complete external leakage current test; the output end of the tripping coil disconnection detection circuit is connected with the tripping coil disconnection monitoring signal input end of the MCU, and the MCU judges whether the tripping coil has a disconnection fault or not by monitoring the output level of the tripping coil disconnection detection circuit;
the MCU sends a driving signal to the internal self-checking circuit at regular time to control the internal self-checking circuit to generate induced leakage current, the induced leakage current of the internal self-checking circuit is collected through the residual current sampling circuit, at the moment, the MCU does not output a tripping signal, and self-checking of the residual current sampling circuit and the zero sequence transformer is completed;
the external test circuit comprises a zero sequence transformer, a current limiting resistor R1, a diode D10 and a key switch SW1, and the internal self-checking circuit comprises a zero sequence transformer, a current limiting resistor R1, a diode D10 and a self-checking control switch device Q1; one end of the current-limiting resistor R1 is connected with a phase voltage, the other end of the current-limiting resistor R1 is connected with a test input end of a zero sequence transformer, a test output end of the zero sequence transformer is respectively connected with one end of a key switch SW1 and one end of a self-checking control switch device Q1 through a diode D10, the other ends of the key switch SW1 and the self-checking control switch device Q1 are grounded, and a driving electrode of the self-checking control switch device Q1 is connected with a driving signal output end of the MCU; the two ends of the key switch SW1 are connected with a key jitter elimination circuit in a bridging mode, and a filter circuit is connected between the self-checking control switch device Q1 and the reference ground in a bridging mode.
2. A residual current protection circuit as claimed in claim 1, wherein: the residual current sampling circuit comprises a sampling resistor RL, a bidirectional parallel diode D9, a proportional amplifying circuit and an output filter circuit, wherein two ends of the sampling resistor RL are connected with an induced current output end of the zero sequence transformer, the bidirectional parallel diode D9 is connected with the sampling resistor RL in parallel and then is connected with the proportional amplifying circuit, and the proportional amplifying circuit amplifies a residual current sampling signal and then is connected with a residual current sampling signal input end of the MCU through the output filter circuit.
3. A residual current protection circuit as claimed in claim 2, wherein: the proportional amplifying circuit comprises an operational amplifier U1, a resistor R4, a resistor R5, a resistor R6 and a resistor R7, wherein the input end of the operational amplifier U1 is connected with a capacitor C3 in parallel, the reverse input end of the operational amplifier U1 is respectively connected with one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R4 is connected with one end of a bidirectional parallel diode D9, the other end of the resistor R6 is respectively connected with the output end of the operational amplifier U1 and an output filter circuit, and two ends of the resistor R6 are connected with the capacitor C4 in parallel;
the positive input end of the operational amplifier U1 is respectively connected with one end of a resistor R5 and one end of a resistor R7, the other end of the resistor R5 is connected with the other end of a bidirectional parallel diode D9, the other end of the resistor R7 is connected with a reference voltage Vref, and two ends of the resistor R7 are connected with a capacitor C5 in parallel.
4. A residual current protection circuit according to claim 1, wherein: the trip coil driving circuit comprises a three-phase full-bridge rectifying circuit, a MOSFET Q2, a resistor R11 and a capacitor C7, wherein the anode of the three-phase full-bridge rectifying circuit is connected with the incoming line of a trip coil, the cathode of the three-phase full-bridge rectifying circuit is grounded, the outgoing line of the trip coil is respectively connected with the input end of a trip coil disconnection detection circuit and the drain electrode of the MOSFET Q2, the output end of the trip coil disconnection detection circuit is connected with the disconnection monitoring signal input end of the trip coil of the MCU, the source electrode of the MOSFET Q2 is grounded, the grid electrode of the trip coil is connected with the trip signal output end of the MCU, one end of the resistor R11 is connected with the grid electrode of the MOSFET Q2, the other end of the resistor R11 is connected with a reference ground, and the C7 is connected with the resistor R11 in parallel to play a filtering role.
5. A residual current protection circuit as claimed in claim 1, wherein: the trip coil broken line detection circuit comprises a resistor R9, a resistor R10, a diode D8 and a capacitor C7, wherein one end of the resistor R9 is connected with an outgoing line of the trip coil, the other end of the resistor R9 is connected with one end of the resistor R10 and a cathode of the diode D8, the other end of the resistor R10 and an anode of the diode D8 are connected with a reference ground, the capacitors C7 and R10 are connected in parallel to play a filtering role, and a cathode of the diode D8 is connected with a trip coil broken line monitoring signal input end of the MCU.
6. A residual current protection device, characterized in that a residual current protection circuit according to any one of claims 1 to 5 is applied, comprising:
the detection element is used for detecting a residual current signal of a circuit or electrical equipment and transmitting the detected residual current signal to the MCU;
the MCU samples the actual residual current in real time, compares the real-time sampling value with a set value, and sends a driving signal to the execution element according to the set delay time when the actual residual current value is higher than the set value, and the execution element controls the switch to trip;
the executive component immediately cuts off the power supply after receiving the signal transmitted by the MCU;
and the inspection element simulates a residual current signal by using external inspection operation and a self-inspection signal sent by the MCU to inspect the quality of the residual current protection device.
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| CN114566941B (en) * | 2022-03-04 | 2023-06-27 | 广东电网有限责任公司 | Residual current and switch state monitoring protection device and method |
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