CN207967913U - A kind of earth leakage protective device for high-power quenching apparatus - Google Patents
A kind of earth leakage protective device for high-power quenching apparatus Download PDFInfo
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- CN207967913U CN207967913U CN201820313863.8U CN201820313863U CN207967913U CN 207967913 U CN207967913 U CN 207967913U CN 201820313863 U CN201820313863 U CN 201820313863U CN 207967913 U CN207967913 U CN 207967913U
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Abstract
A kind of earth leakage protective device for high-power quenching apparatus, including signal sampling module, signal amplification will be acquired signal rectification amplification module and the alarm decision output module that is connect with signal rectification amplification module；Signal sampling module includes current transformer, sampling resistor R10, filter capacitor C4, and one end of filter capacitor C4 is grounded, and the other end exports voltage signal Ui to signal rectification amplification module；Signal rectification amplification module includes the first rectification circuit, the second rectification circuit and signal amplification circuit；Alarm decision output module includes comparison circuit, judges output circuit and power supply mainboard CON1；Output voltage Ui is after the small signal rectifier circuit rectification that operational amplifier U1A and U1B are formed; enter back into the amplifying circuit processing that operational amplifier U1C is constituted; treated, and voltage compares with preset voltage; when it is greater than the set value; warning output is had to power supply mainboard; mainboard stops heating and providing malfunction coefficient after receiving at once, and the utility model can be timely and effective accurately to the leakage current real-time guard of quenching apparatus.
Description
Technical field
The utility model is related to heating equipment fields, specifically a kind of earth leakage protective for high-power quenching apparatus
Device.
Background technology
Practical power is all very big in quenching apparatus, and it is water flowing cooling to load the type of cooling mostly used greatly, this
Just there is higher requirement to its insulation protection.In actual use, the junction portion in load connection water route often occurs
When phenomenon, especially the summer room temperature of seeping water are very high or wintry weather is terribly cold, infiltration is even more frequently generation, once serious infiltration, it will
Leakage phenomenon can occur；Also induction hardening transformer turn-to-turn and over the ground also when have leaky.Simultaneously when the electric appliance in power supply is old
Also there is leaky when change or outlet line breakage.These electric leakages can not only have electrical equipment damage, more likely to scene
Operating personnel cause damages, so the protection of such leakage current is with regard to extremely important.Earth leakage protective device is for preventing the person from touching
Electricity and electric leakage cause a kind of earth protective device of accident, when circuit or electrical equipment leakage current are more than the setting valve of device,
Or when people, animal generation Danger Electric shock risk, earth leakage protective device can act rapidly, cut off emergency power supply, avoid the expansion of accident, protect
Personal, equipment safety is hindered.Therefore, safety utilization of electric power is done in the correct selection and maintenance management work of earth leakage circuit-breaker well
Major technique and management measure.
Utility model content
Purpose of the utility model is to solve the deficiencies of above-mentioned technical problem, and the utility model proposes one kind for big
The earth leakage protective device of power quenching apparatus, can be timely and effective accurately to the leakage current real-time guard of quenching apparatus.
The utility model deficiency to solve above-mentioned technical problem and the technical solution adopted is that：One kind is quenched for high-power
The earth leakage protective device of fiery equipment, including be arranged power supply three-phase major loop output end signal sampling module, signal will be acquired
The signal rectification amplification module of amplification and the alarm decision output module being connect with signal rectification amplification module；The signal is adopted
Egf block includes the current transformer being arranged in power supply triple line, be arranged current transformer two connectors of secondary coil it
Between sampling resistor R10, filter capacitor C4 in the sides sampling resistor R10, one end ground connection of filter capacitor C4, the other end are set
Induced voltage signal Ui in current transformer is exported to signal rectification amplification module；The signal rectification amplification module includes
First rectification circuit, the second rectification circuit and signal amplification circuit, first rectification circuit are connected with the second rectification circuit, institute
It states the second rectification circuit to export rectified signal to signal amplification circuit, the signal amplification circuit exports amplified signal to report
Police judges output module；The alarm decision output module includes that the voltage for transmitting signal amplification circuit is compared with predeterminated voltage
Comparison circuit, the judgement output circuit that is connect with comparison circuit and connect with output circuit is judged and execute judgement output circuit
Result power supply mainboard CON1.
Further, first rectification circuit includes first resistor R1, second resistance R2, the 5th resistance R5, the one or two
Pole pipe D1, operational amplifier U1A, third capacitance C3 and the 5th capacitance C5；One end of the 5th resistance R5 and filter capacitor C4
Connection, the other end are connect with the inverting input of operational amplifier U1A, and the inverting input of operational amplifier U1A is connected with electricity
Source and third capacitance C3, the other end ground connection of third capacitance C3；The in-phase input end of operational amplifier U1A is grounded, and is connected with
Power supply and the 5th capacitance C5, the other end ground connection of the 5th capacitance C5, between the inverting input and output end of operational amplifier U1A
Equipped with the first diode D1；Node, one end of first resistor R1 and filtered electrical are equipped between filter capacitor C4 and the 5th resistance R5
Hold the node connection of C4 and the 5th resistance R5, the other end is connect with the second rectification circuit, and cathode one end of the first diode D1 connects
It is connected to second resistance R2, the other end of second resistance R2 is connect with the second rectification circuit.
Further, second rectification circuit includes the second diode D2, the 6th resistance R6, the first capacitance C1, third
Resistance R3, operational amplifier U1B；The cathode of second diode D2 and the output end of operational amplifier U1A and the first diode
The anode connection of D1, the anode of the second diode D2 are connect with one end of the 6th resistance R6；Second diode D2 and the 6th resistance
Node is equipped between R6, second resistance R2 is connected on the node of the second diode D2 and the 6th resistance R6；6th resistance R6's
The other end is connect with the inverting input of operational amplifier U1B, the in-phase input end ground connection of operational amplifier U1B, operation amplifier
Node is equipped between the inverting input of device U1B and the 6th resistance R6,3rd resistor R3 and the first capacitance C1 are connected in parallel on operation and put
On the inverting input of big device U1B and the node of the 6th resistance R6；The other end and operation of 3rd resistor R3 and the first capacitance C1
The output end of amplifier U1B connects.
Further, the signal amplification circuit includes the 7th resistance R7, the 4th resistance R4 and operational amplifier U1C, the
One end of seven resistance R7 connect with the output end of operational amplifier U1B, the inverting input of the other end and operational amplifier U1C connect
It connects, the in-phase input end ground connection of operational amplifier U1C sets between the 7th resistance R7 and the inverting input of operational amplifier U1C
There is a node, it is another on the node for the inverting input that the 4th one end resistance R4 is connected to the 7th resistance R7 and operational amplifier U1C
Terminate at the output end of operational amplifier U1C.
Further, the comparison circuit includes eleventh resistor R11, twelfth resistor R12, the second capacitance C2, the 6th
Capacitance C6, potentiometer RP1, operational amplifier U1D；One end of eleventh resistor R11 connects with the output end of operational amplifier U1C
It connects, the other end is connect with the in-phase input end of operational amplifier U1D, and eleventh resistor R11 and operational amplifier U1D's is same mutually defeated
Enter node there are two being set between holding, is connected separately with twelfth resistor R12 and the 6th capacitance C6, twelfth resistor R12 and the 6th
The other end of capacitance C6 is grounded；The inverting input of operational amplifier U1D is connect with potentiometer RP1, one end of potentiometer RP1
It is connected to power supply, other end ground connection is connected with second in the inverting input of operational amplifier U1D and the ground terminal of potentiometer RP1
Capacitance C2；The output end of operational amplifier U1D is connect with the judgement output circuit.
Further, the judgement output circuit includes the 8th resistance R8, the 7th capacitance C7, third diode D3, first
Light emitting diode DL1, the second light emitting diode DL2 and triode T1；The output of the 8th one end resistance R8 and operational amplifier U1D
End connection, the other end connect with the cathode of third diode D3, the plus earth of third diode D3, in the 8th resistance R8 and the
Node, the cathode of one end and the 8th resistance R8 and third diode D3 of the 7th capacitance C7 are equipped between the cathode of three diode D3
Between node connection, the other end ground connection；The anode of first light emitting diode DL1 is connect with the cathode of third diode D3, the
The cathode of one light emitting diode DL1 is connect with the anode of the second light emitting diode DL2, and the cathode of the second light emitting diode DL2 connects
Ground, photoelectric action constitutes alarm between the second light emitting diode DL2 and triode T1, and alarm one end connects power supply mainboard
CON1。
The utility model has the beneficial effects that：
Provided by the utility model is a kind of earth leakage protective device for high-power quenching apparatus, when high-power quenching is set
When standby leakage current is more than the preset value or people, animal generation Danger Electric shock risk of device, earth leakage protective device can act rapidly, cut
Disconnected emergency power supply, avoids the expansion of accident, has ensured personal, equipment safety, can be timely and effective accurately to quenching apparatus
Leakage current real-time guard；The earth leakage protective device include be arranged power supply three-phase major loop output end signal sampling module,
The alarm decision output module that the signal rectification amplification module of signal amplification will be acquired and connect with signal rectification amplification module,
The three-phase major loop of power supply passes through current transformer, at this moment induced current is zero, when equipment is due to failure after master is spaced apart output
When causing leakage current or three-phase imbalance, current transformer can detect the electric current, pass through the phase of current transformer three-phase current
Amount and not equal zero phasor and is：Ia+Ib+Ic=I（Leakage current）, such mutual inductor secondary coil is by sampling resistor R10
Pass through the small letter of operational amplifier U1A and operational amplifier U1B compositions with voltage signal a Ui, Ui is exported after filter capacitor C4
After number rectifier circuit rectifies, the amplifying circuit processing that operational amplifier U1C is constituted is entered back into, treated voltage and is preset
Voltage compare, when it is greater than the set value, alarm startup is output to power supply mainboard CON1, power supply mainboard CON1 is received
Stop heating at once afterwards and provides malfunction coefficient.
Description of the drawings
Fig. 1 is the circuit connection diagram of the utility model earth leakage protective device；
Reference numeral：1, signal sampling module, 2, signal rectification amplification module, 3, alarm decision output module, 4, electric current
Mutual inductor, the 5, first rectification circuit, the 6, second rectification circuit, 7, signal amplification circuit, 8, comparison circuit, 9, judge output electricity
Road.
Specific implementation mode
The utility model is further elaborated with reference to specific embodiment.
Specific implementation mode：
As shown in Figure 1, a kind of earth leakage protective device for high-power quenching apparatus, including setting are returned in power supply three-phase master
The signal sampling module 1 of road output end amplifies mould by the signal rectification amplification module 2 for acquiring signal amplification and with signal rectification
The alarm decision output module 3 that block 2 connects；The signal sampling module 1 includes the Current Mutual Inductance being arranged in power supply triple line
Device 4, is arranged in sampling resistor R10 mono- the sampling resistor R10 being arranged between two connectors of secondary coil of current transformer 4
One end of the filter capacitor C4 of side, filter capacitor C4 are grounded, and the other end exports the induced voltage signal Ui in current transformer
To signal rectification amplification module 2；The signal rectification amplification module 2 includes the first rectification circuit 5, the second rectification circuit 6 and letter
Number amplifying circuit 7, first rectification circuit 5 are connected with the second rectification circuit 6, and second rectification circuit 6 is by rectified signal
To signal amplification circuit 7, the signal amplification circuit 7 exports amplified signal to alarm decision output module 3 for output；The report
It is alert judge output module 3 include the voltage for transmitting signal amplification circuit compared with predeterminated voltage comparison circuit 8, with it is more electric
Road connection judges output circuit 9 and connect with output circuit is judged and execute the power supply mainboard for the result for judging output circuit
CON1。
Further, first rectification circuit 5 includes first resistor R1, second resistance R2, the 5th resistance R5, the one or two
Pole pipe D1, operational amplifier U1A, third capacitance C3 and the 5th capacitance C5；One end of the 5th resistance R5 and filter capacitor C4
Connection, the other end are connect with the inverting input of operational amplifier U1A, and the inverting input of operational amplifier U1A is connected with electricity
Source and third capacitance C3, the other end ground connection of third capacitance C3；The in-phase input end of operational amplifier U1A is grounded, and is connected with
Power supply and the 5th capacitance C5, the other end ground connection of the 5th capacitance C5, between the inverting input and output end of operational amplifier U1A
Equipped with the first diode D1；Node, one end of first resistor R1 and filtered electrical are equipped between filter capacitor C4 and the 5th resistance R5
Hold the node connection of C4 and the 5th resistance R5, the other end is connect with the second rectification circuit 6, and cathode one end of the first diode D1 connects
It is connected to second resistance R2, the other end of second resistance R2 is connect with the second rectification circuit 6.
Further, second rectification circuit 6 includes the second diode D2, the 6th resistance R6, the first capacitance C1, third
Resistance R3, operational amplifier U1B；The cathode of second diode D2 and the output end of operational amplifier U1A and the first diode
The anode connection of D1, the anode of the second diode D2 are connect with one end of the 6th resistance R6；Second diode D2 and the 6th resistance
Node is equipped between R6, second resistance R2 is connected on the node of the second diode D2 and the 6th resistance R6；6th resistance R6's
The other end is connect with the inverting input of operational amplifier U1B, the in-phase input end ground connection of operational amplifier U1B, operation amplifier
Node is equipped between the inverting input of device U1B and the 6th resistance R6,3rd resistor R3 and the first capacitance C1 are connected in parallel on operation and put
On the inverting input of big device U1B and the node of the 6th resistance R6；The other end and operation of 3rd resistor R3 and the first capacitance C1
The output end of amplifier U1B connects.
Further, the signal amplification circuit 7 includes the 7th resistance R7, the 4th resistance R4 and operational amplifier U1C, the
One end of seven resistance R7 connect with the output end of operational amplifier U1B, the inverting input of the other end and operational amplifier U1C connect
It connects, the in-phase input end ground connection of operational amplifier U1C sets between the 7th resistance R7 and the inverting input of operational amplifier U1C
There is a node, it is another on the node for the inverting input that the 4th one end resistance R4 is connected to the 7th resistance R7 and operational amplifier U1C
Terminate at the output end of operational amplifier U1C.
Further, the comparison circuit 8 includes eleventh resistor R11, twelfth resistor R12, the second capacitance C2, the 6th
Capacitance C6, potentiometer RP1, operational amplifier U1D；One end of eleventh resistor R11 connects with the output end of operational amplifier U1C
It connects, the other end is connect with the in-phase input end of operational amplifier U1D, and eleventh resistor R11 and operational amplifier U1D's is same mutually defeated
Enter node there are two being set between holding, is connected separately with twelfth resistor R12 and the 6th capacitance C6, twelfth resistor R12 and the 6th
The other end of capacitance C6 is grounded；The inverting input of operational amplifier U1D is connect with potentiometer RP1, one end of potentiometer RP1
It is connected to power supply, other end ground connection is connected with second in the inverting input of operational amplifier U1D and the ground terminal of potentiometer RP1
Capacitance C2；The output end of operational amplifier U1D is connect with the judgement output circuit 9.
Further, the judgement output circuit 9 includes the 8th resistance R8, the 7th capacitance C7, third diode D3, first
Light emitting diode DL1 and the second light emitting diode DL2；8th one end resistance R8 is connect with the output end of operational amplifier U1D, separately
One end is connect with the cathode of third diode D3, the plus earth of third diode D3, in the 8th resistance R8 and third diode
Node, the section between one end and the 8th resistance R8 and the cathode of third diode D3 of the 7th capacitance C7 are equipped between the cathode of D3
Point connection, other end ground connection；The anode of first light emitting diode DL1 is connect with the cathode of third diode D3, and first luminous two
The cathode of pole pipe DL1 is connect with the anode of the second light emitting diode DL2, the cathode ground connection of the second light emitting diode DL2, the second hair
Photoelectric action constitutes alarm between optical diode DL2 and triode T1, and alarm one end connects power supply mainboard CON1.
The earth leakage protective process of the utility model is：When equipment causes leakage current or three-phase imbalance because of failure, electricity
Current transformer can detect the electric current, pass through the phasor and not etc. zero of current transformer three-phase current, phasor and be：Ia+Ib+
Ic=I（Leakage current）, such mutual inductor secondary coil exports a voltage after sampling resistor R10 and filter capacitor C4 to be believed
Number Ui, Ui enter back into operation after the small signal rectifier circuit rectification of operational amplifier U1A and operational amplifier U1B compositions
The amplifying circuit processing that amplifier U1C is constituted, treated, and voltage compares with preset voltage, when it is greater than the set value
When, alarm startup outputs signals to power supply mainboard CON1, and power supply mainboard CON1 stops heating and providing event after receiving at once
Barrier display；Provided by the utility model is a kind of earth leakage protective device for high-power quenching apparatus, when high-power quenching is set
When standby leakage current is more than the preset value or people, animal generation Danger Electric shock risk of device, earth leakage protective device can act rapidly, cut
Disconnected emergency power supply, avoids the expansion of accident, has ensured personal, equipment safety, can be timely and effective accurately to quenching apparatus
Leakage current real-time guard.
The foregoing description of the disclosed embodiments, only for enabling professional and technical personnel in the field to realize or using this
Utility model.Various modifications to these embodiments will be apparent to those skilled in the art, herein
Defined in General Principle can be real in other embodiments without departing from the spirit or scope of the present utility model
It is existing.Therefore, the utility model is not intended to be limited to the embodiments shown herein, and be to fit to it is disclosed herein
Principle and the consistent widest range of features of novelty.
Claims (6)
1. a kind of earth leakage protective device for high-power quenching apparatus, which is characterized in that returned in power supply three-phase master including setting
The signal sampling module of road output end（1）, will acquire signal amplification signal rectification amplification module（2）And it is put with signal rectification
Big module（2）The alarm decision output module of connection（3）；The signal sampling module（1）Including being arranged in power supply triple line
Current transformer（4）, be arranged in current transformer（4）Two connectors of secondary coil between sampling resistor R10, with sampling
One end of the filter capacitor C4 of resistance R10 parallel connections, filter capacitor C4 are grounded, and the other end believes the induced voltage in current transformer
Number Ui is exported to signal rectification amplification module（2）；The signal rectification amplification module（2）Including the first rectification circuit（5）, second
Rectification circuit（6）And signal amplification circuit（7）, first rectification circuit（5）With the second rectification circuit（6）Series connection, described the
Two rectification circuits（6）Rectified signal is exported to signal amplification circuit（7）, the signal amplification circuit（7）Amplified signal is defeated
Go out to alarm decision output module（3）；The alarm decision output module（3）Include the voltage that transmits signal amplification circuit with
The comparison circuit of predeterminated voltage comparison（8）, the judgement output circuit that connect with comparison circuit（9）It is connect with output circuit is judged
And execute the power supply mainboard CON1 for the result for judging output circuit.
2. a kind of earth leakage protective device for high-power quenching apparatus as described in claim 1, which is characterized in that described the
One rectification circuit（5）Including first resistor R1, second resistance R2, the 5th resistance R5, the first diode D1, operational amplifier U1A,
Third capacitance C3 and the 5th capacitance C5；One end of the 5th resistance R5 is connect with filter capacitor C4, the other end and operation amplifier
The inverting input of device U1A connects, and the inverting input of operational amplifier U1A is connected with power supply and third capacitance C3, third electricity
Hold the other end ground connection of C3；The in-phase input end of operational amplifier U1A is grounded, and is connected with power supply and the 5th capacitance C5, and the 5th
The other end of capacitance C5 is grounded, and the first diode D1 is equipped between the inverting input and output end of operational amplifier U1A；Filtering
Node, the node of one end and filter capacitor C4 and the 5th resistance R5 of first resistor R1 are equipped between capacitance C4 and the 5th resistance R5
Connection, the other end and the second rectification circuit（6）Connection, cathode one end of the first diode D1 are connected with second resistance R2, and second
The other end of resistance R2 and the second rectification circuit（6）Connection.
3. a kind of earth leakage protective device for high-power quenching apparatus as described in claim 1, which is characterized in that described the
Two rectification circuits（6）Including the second diode D2, the 6th resistance R6, the first capacitance C1,3rd resistor R3, operational amplifier U1B；
The cathode of second diode D2 is connect with the anode of the output end of operational amplifier U1A and the first diode D1, the two or two pole
The anode of pipe D2 is connect with one end of the 6th resistance R6；Node, the second electricity are equipped between second diode D2 and the 6th resistance R6
Resistance R2 is connected on the node of the second diode D2 and the 6th resistance R6；The other end of 6th resistance R6 and operational amplifier U1B
Inverting input connection, the in-phase input end ground connection of operational amplifier U1B, the inverting input of operational amplifier U1B and the
Be equipped with node between six resistance R6,3rd resistor R3 and the first capacitance C1 be connected in parallel on operational amplifier U1B inverting input and
On the node of 6th resistance R6；The other end of 3rd resistor R3 and the first capacitance C1 are connect with the output end of operational amplifier U1B.
4. a kind of earth leakage protective device for high-power quenching apparatus as described in claim 1, which is characterized in that the letter
Number amplifying circuit（7）Including the 7th resistance R7, the 4th resistance R4 and operational amplifier U1C, one end of the 7th resistance R7 and operation
The output end connection of amplifier U1B, the inverting input connection of the other end and operational amplifier U1C, operational amplifier U1C's is same
Phase input end grounding is equipped with node, the 4th one end resistance R4 between the 7th resistance R7 and the inverting input of operational amplifier U1C
It is connected on the node of the inverting input of the 7th resistance R7 and operational amplifier U1C, it is another to terminate at operational amplifier U1C's
Output end.
5. a kind of earth leakage protective device for high-power quenching apparatus as described in claim 1, which is characterized in that the ratio
Compared with circuit（8）Including eleventh resistor R11, twelfth resistor R12, the second capacitance C2, the 6th capacitance C6, potentiometer RP1, operation
Amplifier U1D；One end of eleventh resistor R11 is connect with the output end of operational amplifier U1C, the other end and operational amplifier
The in-phase input end of U1D connects, and is set between eleventh resistor R11 and the in-phase input end of operational amplifier U1D there are two node,
It is connected separately with twelfth resistor R12 and the 6th capacitance C6, the other end of twelfth resistor R12 and the 6th capacitance C6 are grounded；
The inverting input of operational amplifier U1D is connect with potentiometer RP1, and the one of potentiometer RP1 is terminated with power supply, and the other end is grounded,
It is connected with the second capacitance C2 in the inverting input of operational amplifier U1D and the ground terminal of potentiometer RP1；Operational amplifier U1D
Output end and the judgement output circuit（9）Connection.
6. a kind of earth leakage protective device for high-power quenching apparatus as described in claim 1, which is characterized in that described to sentence
Disconnected output circuit（9）Including the 8th resistance R8, the 7th capacitance C7, third diode D3, the first light emitting diode DL1, the second hair
Optical diode DL2 and triode T1；8th one end resistance R8 is connect with the output end of operational amplifier U1D, the other end and third
The cathode of diode D3 connects, the plus earth of third diode D3, the 8th resistance R8 and third diode D3 cathode it
Between be equipped with node, between one end and the 8th resistance R8 and the cathode of third diode D3 of the 7th capacitance C7 node connection, separately
One end is grounded；The anode of first light emitting diode DL1 is connect with the cathode of third diode D3, the first light emitting diode DL1's
Cathode is connect with the anode of the second light emitting diode DL2, the cathode ground connection of the second light emitting diode DL2, the second light emitting diode
Photoelectric action constitutes alarm between DL2 and triode T1, and alarm one end connects power supply mainboard CON1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820313863.8U CN207967913U (en) | 2018-03-07 | 2018-03-07 | A kind of earth leakage protective device for high-power quenching apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820313863.8U CN207967913U (en) | 2018-03-07 | 2018-03-07 | A kind of earth leakage protective device for high-power quenching apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207967913U true CN207967913U (en) | 2018-10-12 |
Family
ID=63741608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820313863.8U Active CN207967913U (en) | 2018-03-07 | 2018-03-07 | A kind of earth leakage protective device for high-power quenching apparatus |
Country Status (1)
| Country | Link |
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| CN (1) | CN207967913U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190581A (en) * | 2019-06-04 | 2019-08-30 | 上海良信电器股份有限公司 | The Aftercurrent protecting equipment and method of breaker |
-
2018
- 2018-03-07 CN CN201820313863.8U patent/CN207967913U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190581A (en) * | 2019-06-04 | 2019-08-30 | 上海良信电器股份有限公司 | The Aftercurrent protecting equipment and method of breaker |
| CN110190581B (en) * | 2019-06-04 | 2021-11-23 | 上海良信电器股份有限公司 | Residual current protection device and method of circuit breaker |
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