CN212304722U - Electric leakage protection system - Google Patents
Electric leakage protection system Download PDFInfo
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- CN212304722U CN212304722U CN202022290613.7U CN202022290613U CN212304722U CN 212304722 U CN212304722 U CN 212304722U CN 202022290613 U CN202022290613 U CN 202022290613U CN 212304722 U CN212304722 U CN 212304722U
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Abstract
The utility model discloses an electric leakage protection system, which comprises an electric leakage detection module, an isolation transformer, an AC contactor and a switch power supply; the leakage detection module comprises a central processing unit, a power supply unit, a live wire leakage detection circuit L and a zero line leakage detection circuit N; live wire L and zero line N of commercial power are connected respectively to the both ends of isolation transformer's primary coil, and isolation transformer's secondary coil's both ends are passed through ac contactor and are connected with live wire L and zero line N of power consumption circuit respectively, and isolation transformer's secondary coil's both ends still are connected through switching power supply and electrical unit, and isolation transformer's secondary coil's both ends still with live wire leakage detection circuit L, zero line leakage detection circuit N all connect, electrical unit, live wire leakage detection circuit L, zero line leakage detection circuit N all are connected with central processing unit, the utility model discloses can effectively discern the electric leakage problem of zero line or live wire in the power consumption circuit to through the risk of evading the electric leakage and electrocution with the isolation of commercial power.
Description
Technical Field
The utility model relates to a commercial power earth leakage protection system technical field, concretely relates to earth leakage protection system.
Background
When the electric leakage phenomenon occurs to the electric equipment, once the electric leakage risk is avoided without protection on the electric circuit, serious safety accidents and even life risks are easily caused to people and animals. The existing leakage protector detects whether leakage exists through a coil which simultaneously penetrates through a zero line N and a live line L, when the leakage occurs, the voltages of the zero line and the live line are unbalanced, then a drive coil controls the disconnection of an electric circuit, and the leakage protection function is realized through a cut-off circuit. Because the driving coil is needed to realize the leakage protection, the sensitivity of the leakage protector is not high, and the leakage and electric shock phenomena are difficult to avoid when the leakage protector is used.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of above prior art existence, provide the earth leakage protection system of the electric leakage problem of zero line or live wire in the effective accurate discernment power consumption circuit.
The purpose of the utility model is realized through the following technical scheme:
an earth leakage protection system, comprising: the device comprises a leakage detection module, an isolation transformer, an alternating current contactor and a switching power supply; the leakage detection module comprises a central processing unit, a power supply unit, a live wire leakage detection circuit L and a zero line leakage detection circuit N; live wire L and zero line N of commercial power are connected respectively to the both ends of isolation transformer's primary coil, the both ends of isolation transformer's secondary coil are passed through AC contactor and are connected with live wire L and zero line N with the electric circuit respectively, the both ends of isolation transformer's secondary coil still are connected with the electrical unit through switching power supply, the both ends of isolation transformer's secondary coil still with live wire leakage detection circuit L, zero line leakage detection circuit N all connects, electrical unit, live wire leakage detection circuit L, zero line leakage detection circuit N all connects with central processing unit, live wire leakage detection circuit L, zero line leakage detection circuit N all connects with ground wire PE, central processing unit's output and AC contactor connect.
Preferably, the live wire leakage detection line L includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a triode Q1 and a linear optocoupler U1; a live wire end L1 of a secondary coil of the isolation transformer is connected with one end of a resistor R2, one end of a diode D1, one end of a capacitor C1 and the anode of a capacitor C2 through a resistor R1, the other end of the resistor R2 is connected with the anode of an emitter of a linear optocoupler U1, the other end of a diode D1, the other end of a capacitor C1 and the cathode of a capacitor C2 are connected with the cathode of the emitter of a linear optocoupler U1, a receiving end E of the linear optocoupler U1 is connected with a central processor, a receiving end C of the linear optocoupler U1 is connected with the ground GND, the other end of the capacitor C1 is also connected with a collector of a triode Q1, the base of a triode Q1 is connected with the cathode of a diode D2 through a resistor R4, the anode of a diode D2 is connected with the ground PE, the emitter of a triode Q1 is connected with the anode of a diode D3, one end of a capacitor C3 and one end of a resistor R3, the cathode of the diode D3 is connected to the neutral terminal N1 of the secondary winding of the isolation transformer.
Preferably, the neutral leakage detecting line N includes: the circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C4, a capacitor C5, a capacitor C6, a diode D4, a diode D5, a diode D6, a triode Q2 and a linear optocoupler U2; a zero line end N1 of a secondary coil of the isolation transformer is connected with one end of a resistor R7, one end of a diode D5, one end of a capacitor C4 and the anode of a capacitor C5 through a resistor R5, the other end of the resistor R7 is connected with the anode of an emitter of a linear optocoupler U2, the other end of a diode D5, the other end of a capacitor C4 and the cathode of a capacitor C5 are connected with the cathode of the emitter of a linear optocoupler U2, the receiving end E of the linear optocoupler U2 is connected with a central processor, the receiving end C of the linear optocoupler U2 is connected with the ground GND, the other end of the capacitor C4 is also connected with a collector of a triode Q2, the base of a triode Q2 is connected with the cathode of a diode D4 through a resistor R5, the anode of a diode D4 is connected with the ground PE, the emitter of a triode Q2 is connected with the anode of a diode D6, one end of a capacitor C6 and one end of a resistor R6, the cathode of the diode D5 is connected to the live line terminal L1 of the secondary winding of the isolation transformer.
Preferably, the electrical leakage detection module further includes: and the alarm content display screen is connected with the central processing unit.
Preferably, the rated core of the isolation transformer is connected with the ground wire of the commercial power.
Preferably, the drive current of the triode Q1 and the drive current of the triode Q2 are 0.05 mA-15.5 mA, and the optocoupler adopts a linear optocoupler and can feed back leakage current to the central processing unit.
Compared with the prior art, the utility model have following advantage:
the utility model is connected between the commercial power and the power circuit of the user through the leakage protection system; the live wire leakage detection line L and the zero line leakage detection line N respectively detect whether the zero line N and the live wire L leak electricity or not; if the live wire leakage detection circuit L detects the leakage of the live wire L, the alternating current contactor is closed, the commercial power and a power supply circuit for a user are disconnected, and alarm information is displayed; if zero line electric leakage detection circuitry N detects out zero line N electric leakage, then ac contactor closes, disconnection commercial power and the power supply line for the user to show alarm information or only show alarm information, consequently, the utility model discloses can effectively discern the electric leakage problem of zero line or live wire in the power consumption circuit, and because the ground wire of this earth leakage protection system and the ground wire of commercial power are kept apart, can not produce the return circuit with the ground when human touching leakage equipment, can not produce the risk of electrocuteeing.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of the earth leakage protection system of the present embodiment.
Fig. 2 is a circuit diagram of the live line leakage detection circuit L according to the present embodiment.
Fig. 3 is a circuit diagram of the zero line leakage detection circuit N according to the present embodiment.
Fig. 4 is a schematic flow chart of the leakage protection method of the present embodiment.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1, an earth leakage protection system comprises: the device comprises a leakage detection module, an isolation transformer, an alternating current contactor and a switching power supply; the leakage detection module comprises a central processing unit, a power supply unit, a live wire leakage detection circuit L and a zero line leakage detection circuit N; live wire L and zero line N of commercial power are connected respectively to the both ends of isolation transformer's primary coil, the both ends of isolation transformer's secondary coil are passed through AC contactor and are connected with live wire L and zero line N with the electric circuit respectively, the both ends of isolation transformer's secondary coil still are connected with the electrical unit through switching power supply, the both ends of isolation transformer's secondary coil still with live wire leakage detection circuit L, zero line leakage detection circuit N all connects, electrical unit, live wire leakage detection circuit L, zero line leakage detection circuit N all connects with central processing unit, live wire leakage detection circuit L, zero line leakage detection circuit N all connects with ground wire PE, central processing unit's output and AC contactor connect.
In this embodiment, referring to fig. 2, the live line leakage detection line L includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a triode Q1 and a linear optocoupler U1; a live wire end L1 of a secondary coil of the isolation transformer is connected with one end of a resistor R2, one end of a diode D1, one end of a capacitor C1 and the anode of a capacitor C2 through a resistor R1, the other end of the resistor R2 is connected with the anode of an emitter of a linear optocoupler U1, the other end of a diode D1, the other end of a capacitor C1 and the cathode of a capacitor C2 are connected with the cathode of the emitter of a linear optocoupler U1, a receiving end E of the linear optocoupler U1 is connected with a central processor, a receiving end C of the linear optocoupler U1 is connected with the ground GND, the other end of the capacitor C1 is also connected with a collector of a triode Q1, the base of a triode Q1 is connected with the cathode of a diode D2 through a resistor R4, the anode of a diode D2 is connected with the ground PE, the emitter of a triode Q1 is connected with the anode of a diode D3, one end of a capacitor C3 and one end of a resistor R3, the cathode of the diode D3 is connected to the neutral terminal N1 of the secondary winding of the isolation transformer.
In the present embodiment, referring to fig. 3, the zero line leakage detection circuit N includes: the circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C4, a capacitor C5, a capacitor C6, a diode D4, a diode D5, a diode D6, a triode Q2 and a linear optocoupler U2; a zero line end N1 of a secondary coil of the isolation transformer is connected with one end of a resistor R7, one end of a diode D5, one end of a capacitor C4 and the anode of a capacitor C5 through a resistor R5, the other end of the resistor R7 is connected with the anode of an emitter of a linear optocoupler U2, the other end of a diode D5, the other end of a capacitor C4 and the cathode of a capacitor C5 are connected with the cathode of the emitter of a linear optocoupler U2, the receiving end E of the linear optocoupler U2 is connected with a central processor, the receiving end C of the linear optocoupler U2 is connected with the ground GND, the other end of the capacitor C4 is also connected with a collector of a triode Q2, the base of a triode Q2 is connected with the cathode of a diode D4 through a resistor R5, the anode of a diode D4 is connected with the ground PE, the emitter of a triode Q2 is connected with the anode of a diode D6, one end of a capacitor C6 and one end of a resistor R6, the cathode of the diode D5 is connected to the live line terminal L1 of the secondary winding of the isolation transformer.
The ground line PE is a ground line of the leakage protection system.
Wherein, the utility model discloses a leakage protection system connects between commercial power and user's power consumption circuit. The leakage protection system isolates the commercial power and the power line through the 1:1 isolation transformer, so that the phenomenon of electric shock cannot be caused when any one live wire L or zero line N is touched independently, and the electric shock safety problem of leakage is avoided.
In this embodiment, the leakage detecting module further includes: and the alarm content display screen is connected with the central processing unit.
In this embodiment, the isolation transformer is 1:1 isolation transformer, 1: the rated iron core of the isolation transformer is connected with the ground wire of the commercial power, and the isolation transformer is used for shielding induced electromotive force generated between two coils of the isolation transformer and avoiding interfering with the stability of a leakage detection circuit.
In this embodiment, the opto-coupler adopts linear opto-coupler, can feed back central processing unit with the size of leakage current, and the safe electric current of zero line and live wire that central processing unit preset is 0.3 mA.
In this embodiment, the central processing unit is an ARM, and the model is STM32F 103.
A leakage protection method, presetting two different alarm levels, namely a conventional level and a highest level alarm, and taking the condition that an alternating current contactor is controlled to cut off a power supply line only when a leakage problem of a live wire is detected as the conventional level; the condition that the alternating current contactor cuts off a power supply line is controlled to serve as the highest-level alarm no matter zero line leakage or live wire leakage occurs. Referring to fig. 4, a method of leakage protection specifically includes:
connecting the leakage protection system between the commercial power and the power circuit of the user;
the live wire leakage detection circuit L judges whether live wire leakage current is larger than 0.3mA, if yes, the live wire leakage detection circuit L detects live wire leakage, the alternating current contactor is closed, the commercial power and a power supply circuit for a user are disconnected, and alarm information is displayed; specifically, live wire electric leakage detection circuitry L detects out live wire L electric leakage, then ac contactor closes, breaks off the commercial power and gives user's power supply line to the step that shows alarm information includes: when the leakage problem occurs in the live wire L of the commercial power, the current of the live wire L flows to the ground wire PE through the leakage position, the current of the ground wire PE drives the triode Q1 to be conducted, a loop is formed between the end L1 and the end N1 of the secondary coil of the isolation transformer, the linear optocoupler U1 is driven to work, the linear optocoupler U1 outputs live wire leakage current ALARM _ L1 to the central processing unit, the central processing unit outputs a disconnection protection control signal to the alternating current contactor after receiving the live wire leakage current ALARM _ L1 exceeding a preset safe current threshold, the alternating current contactor is closed, the commercial power is disconnected and a power supply circuit for a user is disconnected, and meanwhile, a 'live wire leakage' ALARM is displayed on an ALARM content display.
If the live wire leakage detection circuit L judges that the live wire leakage current is not more than 0.3mA, the zero line leakage detection circuit N judges that the zero line leakage current is not more than 0.3mA, if so, whether the zero line leakage current is the highest alarm level is judged, if so, the AC contactor is closed, the commercial power and a power supply line for a user are disconnected, and alarm information is displayed; if the alarm level is not the highest alarm level, only alarm information is displayed. Specifically, the method comprises the following steps: when the zero line N of the commercial power has a leakage problem, the current of the zero line N flows to the ground wire PE through the leakage position, the current of the ground wire PE drives the triode Q2 to be conducted, a loop is formed between the L1 end and the N1 end of the secondary coil of the isolation transformer to drive the linear optocoupler U2 to work, the linear optocoupler U2 outputs zero line leakage current ALARM _ N1 to the central processing unit, and after the central processing unit receives the zero line leakage current ALARM _ N1, if the system is judged to be set to be at the highest ALARM level, then the open circuit protection control signal is output to the AC contactor, the AC contactor is closed, the commercial power and the power supply circuit for the user are disconnected, and simultaneously displaying a zero line leakage ALARM on the ALARM content display screen, and if the ALARM content display screen judges that the system setting is not the highest ALARM level, displaying the zero line leakage ALARM only on the ALARM content display screen after the central processing unit receives the zero line leakage current ALARM _ N1 exceeding the preset safe current threshold.
Therefore, when the zero line N electric leakage problem occurs, because the ground wire of the electric leakage protection system is isolated from the ground wire of the commercial power, a loop cannot be generated between a human body and the ground when the human body touches the electric leakage equipment, the electric shock risk cannot be generated, the system judges the slight electric leakage problem and gives an alarm warning to prompt a user to detect the line problem.
When taking place live wire L electric leakage problem, because the ground wire of this earth leakage protection system and the ground wire of commercial power are kept apart, can not produce the return circuit with the ground when human touching leakage equipment, can not produce the risk of electrocuting this moment yet, nevertheless because live wire electric leakage is comparatively dangerous, if there is the consumer of other zero line electric leakage phenomena, still there is the danger of electrocuting, so the system is judged for serious electric leakage problem, cuts off the power consumption circuit when giving alarm warning, needs the user to overhaul the circuit problem.
The above-mentioned specific implementation is the preferred embodiment of the present invention, can not be right the utility model discloses the limit, any other does not deviate from the technical scheme of the utility model and the change or other equivalent replacement modes of doing all contain within the scope of protection of the utility model.
Claims (6)
1. An earth leakage protection system, comprising: the device comprises a leakage detection module, an isolation transformer, an alternating current contactor and a switching power supply; the leakage detection module comprises a central processing unit, a power supply unit, a live wire leakage detection circuit L and a zero line leakage detection circuit N;
live wire L and zero line N of commercial power are connected respectively to the both ends of isolation transformer's primary coil, the both ends of isolation transformer's secondary coil are passed through AC contactor and are connected with live wire L and zero line N with the electric circuit respectively, the both ends of isolation transformer's secondary coil still are connected with the electrical unit through switching power supply, the both ends of isolation transformer's secondary coil still with live wire leakage detection circuit L, zero line leakage detection circuit N all connects, electrical unit, live wire leakage detection circuit L, zero line leakage detection circuit N all connects with central processing unit, live wire leakage detection circuit L, zero line leakage detection circuit N all connects with ground wire PE, central processing unit's output and AC contactor connect.
2. The earth leakage protection system according to claim 1, wherein the live line leakage detection line L comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a triode Q1 and a linear optocoupler U1;
a live wire end L1 of a secondary coil of the isolation transformer is connected with one end of a resistor R2, one end of a diode D1, one end of a capacitor C1 and the anode of a capacitor C2 through a resistor R1, the other end of the resistor R2 is connected with the anode of an emitter of a linear optocoupler U1, the other end of a diode D1, the other end of a capacitor C1 and the cathode of a capacitor C2 are connected with the cathode of the emitter of a linear optocoupler U1, a receiving end E of the linear optocoupler U1 is connected with a central processor, a receiving end C of the linear optocoupler U1 is connected with the ground GND, the other end of the capacitor C1 is also connected with a collector of a triode Q1, the base of a triode Q1 is connected with the cathode of a diode D2 through a resistor R4, the anode of a diode D2 is connected with the ground PE, the emitter of a triode Q1 is connected with the anode of a diode D3, one end of a capacitor C3 and one end of a resistor R3, the cathode of the diode D3 is connected to the neutral terminal N1 of the secondary winding of the isolation transformer.
3. The earth leakage protection system according to claim 2, wherein the neutral leakage detection line N includes: the circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C4, a capacitor C5, a capacitor C6, a diode D4, a diode D5, a diode D6, a triode Q2 and a linear optocoupler U2;
a zero line end N1 of a secondary coil of the isolation transformer is connected with one end of a resistor R7, one end of a diode D5, one end of a capacitor C4 and the anode of a capacitor C5 through a resistor R5, the other end of the resistor R7 is connected with the anode of an emitter of a linear optocoupler U2, the other end of a diode D5, the other end of a capacitor C4 and the cathode of a capacitor C5 are connected with the cathode of the emitter of a linear optocoupler U2, the receiving end E of the linear optocoupler U2 is connected with a central processor, the receiving end C of the linear optocoupler U2 is connected with the ground GND, the other end of the capacitor C4 is also connected with a collector of a triode Q2, the base of a triode Q2 is connected with the cathode of a diode D4 through a resistor R5, the anode of a diode D4 is connected with the ground PE, the emitter of a triode Q2 is connected with the anode of a diode D6, one end of a capacitor C6 and one end of a resistor R6, the cathode of the diode D5 is connected to the live line terminal L1 of the secondary winding of the isolation transformer.
4. The earth leakage protection system of claim 1, wherein the earth leakage detection module further comprises: and the alarm content display screen is connected with the central processing unit.
5. A leakage protection system according to claim 1, wherein the core of the isolation transformer is connected to the ground of the mains.
6. A leakage protection system according to claim 3, wherein the driving current of the transistor Q1 and the transistor Q2 is 0.05 mA-15.5 mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022290613.7U CN212304722U (en) | 2020-10-15 | 2020-10-15 | Electric leakage protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022290613.7U CN212304722U (en) | 2020-10-15 | 2020-10-15 | Electric leakage protection system |
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| CN212304722U true CN212304722U (en) | 2021-01-05 |
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| CN202022290613.7U Active CN212304722U (en) | 2020-10-15 | 2020-10-15 | Electric leakage protection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909891A (en) * | 2020-10-15 | 2021-06-04 | 广东骉马机器人科技有限公司 | Leakage protection system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909891A (en) * | 2020-10-15 | 2021-06-04 | 广东骉马机器人科技有限公司 | Leakage protection system and method |
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