CN203747369U - Multipath earth leakage lockout protection device for mining - Google Patents
Multipath earth leakage lockout protection device for mining Download PDFInfo
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- CN203747369U CN203747369U CN201420101617.8U CN201420101617U CN203747369U CN 203747369 U CN203747369 U CN 203747369U CN 201420101617 U CN201420101617 U CN 201420101617U CN 203747369 U CN203747369 U CN 203747369U
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Abstract
The utility model relates to a multipath earth leakage lockout protection device for mining, and is characterized in that: a shell is internally provided with a plurality of independent earth leakage lockout protection modules, a shared detection power supply module, and a reference voltage module; the shell is provided with a shared power supply interface, and a signal input interface and a signal output interface which are corresponding to each path of the earth leakage lockout protection module; each path of the earth leakage lockout protection module is formed by a detection comparison module and a signal output module; a detection power supply output end of the detection power supply module is respectively connected with the reference voltage module, the detection comparison module, and a detection power supply input end of the signal output module; a reference power supply output end of the reference voltage module is connected with a reference power supply input end of the detection comparison module; a signal input end of the detection comparison module is connected to the signal input interface; and a signal output end of detection comparison module is connected with the signal output module, so as to realize the simultaneous multipath detection and output. The multipath earth leakage lockout protection device for mining is convenient, simple, and highly versatile, and is high in anti-interference ability.
Description
[technical field]
The utility model relates to electric leakage protection technology field, specifically a kind of mining device of realizing multichannel leakage latching protection.
[background technology]
Due to coal mine environment humidity, condition of work is more severe, requires high to equipment and insulation property thereof.According to safety regulations in coal mine, low-voltage equipment control must possess electrical leakage locking device.
If generation leak current fault, as protection not in time, it may cause the danger of personal life; It may cause the blast of gas, coal dust; Its possibility premature ignition detonator; There is the isolated neutral system of larger distributed capacitance all likely to make motor one phase winding burn for earth neutral system and system.For this is to Coal Mine Electromotor and supply line thereof, particularly down-hole, must carry out earth leakage protective.Before giving major loop equipment energising, first the insulation property of equipment are detected, if insulating resistance value below setting, the action of leakage latching protection device, forbids to major loop power transmission.
In existing earth leakage search/lockout circuit, one is by adopting Single-chip Controlling, although that this method detects is more accurate, and relatively load of circuit, and need programming, cost is too high; Also having one is directly to adopt IC(comparator) single limit comparator circuit of doing; by two voltage ratios; reach protection object; but sort circuit reliability is too poor; poor anti jamming capability; easily misoperation, and can only reach in the time of insulation property setting and realize earth leakage search/lockout, but do not accomplish unlocking (being all 1.1 times of left and right unlockings mostly) in the time of 1.5 times of settings.
[summary of the invention]
The purpose of this utility model is to overcome the technical problem that prior art exists, and a kind of mining multichannel leakage latching protection device of new structure is provided.
For achieving the above object, design a kind of mining multichannel leakage latching protection device, comprise housing, it is characterized in that: in described housing, be provided with the separate leakage latching protection module in some roads and shared detection power module, reference voltage module, described housing is provided with shared power interface and the signal input interface corresponding with each road leakage latching protection module, signal output interface, each road leakage latching protection module is by detecting comparison module, signal output module forms, described detection power module by power interface by external power source, the detection power output end of described detection power module connects respectively reference voltage module, detect the detection power input of comparison module and signal output module, the reference power source output of described reference voltage module connects the reference power source input that detects comparison module, the signal input part that detects comparison module is connected with signal input interface, the signal output part of described detection comparison module is connected with signal output module, and by the outside output signal of signal output interface, equipment under test is connected by plug wire with signal input interface, realizing multichannel simultaneously detects, multichannel output.
In described detection comparison module, be provided with hysteresis comparison circuit, described hysteresis comparison circuit is made up of voltage stabilizing didoe ZD1, ZD2, capacitor C 1, C2, C3, resistance R 106, R107, R109, R110, R111, R112, R113, R114, swept resistance POT1, POT2, operational amplifier U2A, U2B and wire jumper LINK1, wire jumper LINK1 is provided with three ports, realizes virtual voltage grade and adjust cross-over connection between 660V and 1140V.The second port of wire jumper LINK1 is that signal input part is connected with equipment under test, one end of the first port contact resistance R111 of described wire jumper LINK1, other end contact resistance R113 one end of resistance R 111, resistance R 113 other end concatenation operation amplifier U2A reverse input ends, operational amplifier U2A is input contact resistance R106 one end in the same way, resistance R 106 other ends connect reference power source Vref1, resistance R 106 and operational amplifier U2A input tap one end contact resistance R107 one end in the same way, resistance R 107 other end concatenation operation amplifier U2A outputs, and tap one end connects the diode D1 of signal output apparatus, between resistance R 111 and resistance R 113, tap one end is connected capacitor C 1 one end, capacitor C 1 other end connects the anodal also ground connection of voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD1 negative pole contact resistance R111 and capacitor C 1 tap one end, resistance R 111 is connected swept resistance POT1 one end with voltage stabilizing didoe ZD1 negative pole tap one end, the swept resistance POT1 other end connects detection power supply,
One end of the 3rd port contact resistance R112 of described wire jumper LINK1, other end contact resistance R114 one end of resistance R 112, resistance R 114 other end concatenation operation amplifier U2B reverse input ends, operational amplifier U2B reverse input end connects detection power supply, operational amplifier U2B reverse input end with detect tap one end between power supply and be connected capacitor C 3 one end, capacitor C 3 other end ground connection, operational amplifier U2B is input contact resistance R109 one end ground connection in the same way, resistance R 109 other ends connect reference power source Vref2, resistance R 109 and operational amplifier U2B input tap one end contact resistance R110 one end in the same way, resistance R 110 other end concatenation operation amplifier U2B outputs, and tap one end connects the diode D2 of signal output apparatus, between resistance R 112 and resistance R 114, tap one end is connected capacitor C 2 one end, capacitor C 2 other ends connect the anodal also ground connection of voltage stabilizing didoe ZD2, between resistance R 112 and voltage stabilizing didoe ZD2 negative pole, one section of tap is connected swept resistance POT2 and connects and detects power supply.
In described signal output module, be provided with signal output apparatus, described signal output apparatus is made up of diode D1, D2, D11, LED 1, resistance R 2, R103, R104, triode Q1, Q2 and K1A, the base stage of described triode Q1 is connected with resistance R 103 one end, and resistance R 103 other ends are connected with diode D2 negative pole; The emitter connecting luminous diode LED1 negative pole of described triode Q1, the anodal contact resistance R2 of LED 1 one end, resistance R 2 one end are connected with diode D1 negative pole, the emitter of described triode Q1 and the equal ground connection of LED 1 negative pole; Collector electrode contact resistance R104 one end of described triode Q1, resistance R 104 other ends connect detection power supply; The base stage of tap one end connecting triode Q2 between the collector electrode of described triode Q1 and resistance R 104, the grounded emitter of triode Q2, collector connection relay coil K1A one end of triode Q2, the relay coil K1A other end connects detection power supply, relay coil K1A is connected diode D11 positive pole with collector electrode tap one end of triode Q2, and diode D11 negative pole connects detection power supply.
In described power module, be provided with power circuit, described power circuit is by voltage stabilizing didoe ZD11, Light-Emitting Diode LED6, polar capacitor C16, capacitor C 17 and resistance R 1 form, one end of described resistance R 1 connects detects power output end, described resistance R 1 other end connects Light-Emitting Diode LED6 positive pole, the minus earth of described Light-Emitting Diode LED6, between described resistance R 1 and detection power output end, tap one end is connected capacitor C 17, between described capacitor C 17 and detection power output end, tap one end is connected polar capacitor C16 positive pole, between described polar capacitor C16 positive pole and detection power output end, tap one end is connected voltage stabilizing didoe ZD11 positive pole, described voltage stabilizing didoe ZD11 negative pole, Light-Emitting Diode LED6 negative pole, polar capacitor C16 negative pole, the other end ground connection of capacitor C 17, form four road parallel circuitss.
Described detection power supply is 24Vdc, and installs TVS pipe additional at detection power input.
In described reference voltage module, be provided with reference voltage circuit, described reference voltage circuit is made up of two parts, Part I is by resistance R 101, R105, capacitor C 18, C20, polar capacitor C22 and operational amplifier U1A form, connect with resistance R 105 one end in one end of resistance R 101, the other end of resistance R 105 connects detection power supply, the other end ground connection of resistance R 101, tap one end concatenation operation amplifier U1A input in the same way between resistance R 101 and resistance R 105, operational amplifier U1A in the same way between input and resistance R 101 tap one end be connected capacitor C 18 one end, capacitor C 18 other end ground connection, the reverse input end of described operational amplifier U1A connects polar capacitor C22 positive pole, polar capacitor C22 minus earth, the output of described operational amplifier U1A connects one end of capacitor C 20, and tap one end output reference power source Vref1, the other end ground connection of capacitor C 20,
Part II is by resistance R 102, R108, capacitor C 19, C21, C24, polar capacitor C23 and operational amplifier U1B, connect with resistance R 108 one end in one end of resistance R 102, the other end of resistance R 108 connects detection power supply, the other end ground connection of resistance R 102, tap one end concatenation operation amplifier U1B input one end in the same way between resistance R 102 and resistance R 108, operational amplifier U1B is input other end ground connection in the same way, operational amplifier U1B in the same way between input and resistance R 102 tap one end be connected capacitor C 19 one end, capacitor C 19 other end ground connection, reverse input end one end of described operational amplifier U1B connects polar capacitor C23 positive pole, polar capacitor C23 minus earth, the reverse input end other end of described operational amplifier U1B connects detection power supply, and tap one end connects capacitor C 24 ground connection, the output of described operational amplifier U1B connects one end of capacitor C 21, and tap one end output reference power source Vref2, the other end ground connection of capacitor C 21.
On described housing, be also provided with power supply and malfunction indicator lamp.
Described each signal output interface place, road is all provided with one group and often opens and normally closed passive contact, and described often opening and normally-closed contact independence mutually, without electrical connection.
This mining multichannel leakage latching protection utensil has following advantage:
1. the requirement of pair detection power supply is to have certain voltage and sufficiently high internal resistance.At present domestic general voltage is 10-40 volt, also has and adopts 100 volts, detect overtension and often cannot accomplish safe spark, and detection sensitivity is general and detect independent from voltage.It is 24Vdc that this protector detects power supply, and input is installed additional to TVS pipe, improves the interference free performance of mains side.
2. in circuit, used first hysteresis comparison circuit, this electric circuit characteristic is to have hysteretic characteristic, has inertia, thereby also just has very strong antijamming capability.
3. added wire jumper, can between 660V and 1140V, adjust according to virtual voltage grade, and without adjusting again other electric component, convenient, simple, highly versatile.
4. realize that simultaneously multichannel detects, multichannel output, each road output has one often to open the passive contact normally closed with, and Chang Kai is independently with normally-closed contact, without being electrically connected.
5. added power supply and malfunction indicator lamp, very clear to running status.
[brief description of the drawings]
Fig. 1 is the general frame of the utility model multichannel leakage latching protection device;
Fig. 2 is single channel leakage latching protection functional block diagram.
[embodiment]
Now in conjunction with the drawings and the specific embodiments the technical solution of the utility model is further elaborated, believes it is clearly for a person skilled in the art.
The mining multichannel leakage latching protection of one device as shown in Figure 1; comprise housing; in described housing, be provided with the separate leakage latching protection module in some roads and shared detection power module, reference voltage module; described housing is provided with shared power interface and signal input interface, the signal output interface corresponding with each road leakage latching protection module; each signal output interface place, road is all provided with one group and often opens and normally closed passive contact; described often opening and normally-closed contact independence mutually, without electrical connection.Each road leakage latching protection module by detecting comparison module, signal output module forms, and in each module, is provided with particular electrical circuit, wherein:
A hysteresis comparison circuit
In described detection comparison module, be provided with hysteresis comparison circuit, described hysteresis comparison circuit is made up of voltage stabilizing didoe ZD1, ZD2, capacitor C 1, C2, C3, resistance R 106, R107, R109, R110, R111, R112, R113, R114, swept resistance POT1, POT2, operational amplifier U2A, U2B and wire jumper LINK1, wire jumper LINK1 is provided with three ports, and the second port of wire jumper LINK1 is that signal input part is connected with equipment under test, one end of the first port contact resistance R111 of described wire jumper LINK1, other end contact resistance R113 one end of resistance R 111, resistance R 113 other end concatenation operation amplifier U2A reverse input ends, operational amplifier U2A is input contact resistance R106 one end in the same way, resistance R 106 other ends connect reference power source Vref1, resistance R 106 and operational amplifier U2A input tap one end contact resistance R107 one end in the same way, resistance R 107 other end concatenation operation amplifier U2A outputs, and tap one end connects the diode D1 of signal output apparatus, between resistance R 111 and resistance R 113, tap one end is connected capacitor C 1 one end, capacitor C 1 other end connects the anodal also ground connection of voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD1 negative pole contact resistance R111 and capacitor C 1 tap one end, resistance R 111 is connected swept resistance POT1 one end with voltage stabilizing didoe ZD1 negative pole tap one end, the swept resistance POT1 other end connects detection power supply,
One end of the 3rd port contact resistance R112 of described wire jumper LINK1, other end contact resistance R114 one end of resistance R 112, resistance R 114 other end concatenation operation amplifier U2B reverse input ends, operational amplifier U2B reverse input end connects detection power supply, operational amplifier U2B reverse input end with detect tap one end between power supply and be connected capacitor C 3 one end, capacitor C 3 other end ground connection, operational amplifier U2B is input contact resistance R109 one end ground connection in the same way, resistance R 109 other ends connect reference power source Vref2, resistance R 109 and operational amplifier U2B input tap one end contact resistance R110 one end in the same way, resistance R 110 other end concatenation operation amplifier U2B outputs, and tap one end connects the diode D2 of signal output apparatus, between resistance R 112 and resistance R 114, tap one end is connected capacitor C 2 one end, capacitor C 2 other ends connect the anodal also ground connection of voltage stabilizing didoe ZD2, between resistance R 112 and voltage stabilizing didoe ZD2 negative pole, one section of tap is connected swept resistance POT2 and connects and detects power supply.
B signal output apparatus
In described signal output module, be provided with signal output apparatus, described signal output apparatus is made up of diode D1, D2, D11, LED 1, resistance R 2, R103, R104, triode Q1, Q2 and relay coil K1A, the base stage of described triode Q1 is connected with resistance R 103 one end, and resistance R 103 other ends are connected with diode D2 negative pole; The emitter connecting luminous diode LED1 negative pole of described triode Q1, the anodal contact resistance R2 of LED 1 one end, resistance R 2 one end are connected with diode D1 negative pole, the emitter of described triode Q1 and the equal ground connection of LED 1 negative pole; Collector electrode contact resistance R104 one end of described triode Q1, resistance R 104 other ends connect detection power supply; The base stage of tap one end connecting triode Q2 between the collector electrode of described triode Q1 and resistance R 104, the grounded emitter of triode Q2, collector connection relay coil K1A one end of triode Q2, the relay coil K1A other end connects detection power supply, relay coil K1A is connected diode D11 positive pole with collector electrode tap one end of triode Q2, and diode D11 negative pole connects detection power supply.
C-power supply circuit
In described power module, be provided with power circuit, described power circuit is by voltage stabilizing didoe ZD11, Light-Emitting Diode LED6, polar capacitor C16, capacitor C 17 and resistance R 1 form, one end of described resistance R 1 connects detects power output end, described resistance R 1 other end connects Light-Emitting Diode LED6 positive pole, the minus earth of described Light-Emitting Diode LED6, between described resistance R 1 and detection power output end, tap one end is connected capacitor C 17, between described capacitor C 17 and detection power output end, tap one end is connected polar capacitor C16 positive pole, between described polar capacitor C16 positive pole and detection power output end, tap one end is connected voltage stabilizing didoe ZD11 positive pole, described voltage stabilizing didoe ZD11 negative pole, Light-Emitting Diode LED6 negative pole, polar capacitor C16 negative pole, the other end ground connection of capacitor C 17, form four road parallel circuitss.
D reference voltage circuit
In described reference voltage module, be provided with reference voltage circuit, described reference voltage circuit is made up of two parts, Part I is by resistance R 101, R105, capacitor C 18, C20, polar capacitor C22 and operational amplifier U1A form, connect with resistance R 105 one end in one end of resistance R 101, the other end of resistance R 105 connects detection power supply, the other end ground connection of resistance R 101, tap one end concatenation operation amplifier U1A input in the same way between resistance R 101 and resistance R 105, operational amplifier U1A in the same way between input and resistance R 101 tap one end be connected capacitor C 18 one end, capacitor C 18 other end ground connection, the reverse input end of described operational amplifier U1A connects polar capacitor C22 positive pole, polar capacitor C22 minus earth, the output of described operational amplifier U1A connects one end of capacitor C 20, and tap one end output reference power source Vref1, the other end ground connection of capacitor C 20,
Part II is by resistance R 102, R108, capacitor C 19, C21, C24, polar capacitor C23 and operational amplifier U1B, connect with resistance R 108 one end in one end of resistance R 102, the other end of resistance R 108 connects detection power supply, the other end ground connection of resistance R 102, tap one end concatenation operation amplifier U1B input one end in the same way between resistance R 102 and resistance R 108, operational amplifier U1B is input other end ground connection in the same way, operational amplifier U1B in the same way between input and resistance R 102 tap one end be connected capacitor C 19 one end, capacitor C 19 other end ground connection, reverse input end one end of described operational amplifier U1B connects polar capacitor C23 positive pole, polar capacitor C23 minus earth, the reverse input end other end of described operational amplifier U1B connects detection power supply, and tap one end connects capacitor C 24 ground connection, the output of described operational amplifier U1B connects one end of capacitor C 21, and tap one end output reference power source Vref2, the other end ground connection of capacitor C 21.
Finally will detect power module by power interface by external power source, the detection power output end of described detection power module connects respectively reference voltage module, detect the detection power input of comparison module and signal output module, the reference power source output of described reference voltage module connects the reference power source input that detects comparison module, the signal input part that detects comparison module is connected with signal input interface, the signal output part of described detection comparison module is connected with signal output module, and by the outside output signal of signal output interface, equipment under test is connected by plug wire with signal input interface, can realize multichannel simultaneously detects, multichannel output, detect power supply and be decided to be 24Vdc, and install TVS pipe additional at detection power input, and power supply and malfunction indicator lamp be installed on housing.Wire jumper LINK1 realizes virtual voltage grade and adjust cross-over connection between 660V and 1140V.
Claims (8)
1. a mining multichannel leakage latching protection device, comprise housing, it is characterized in that: in described housing, be provided with the separate leakage latching protection module in some roads and shared detection power module, reference voltage module, described housing is provided with shared power interface and the signal input interface corresponding with each road leakage latching protection module, signal output interface, each road leakage latching protection module is by detecting comparison module, signal output module forms, described detection power module by power interface by external power source, the detection power output end of described detection power module connects respectively reference voltage module, detect the detection power input of comparison module and signal output module, the reference power source output of described reference voltage module connects the reference power source input that detects comparison module, the signal input part that detects comparison module is connected with signal input interface, the signal output part of described detection comparison module is connected with signal output module, and by the outside output signal of signal output interface, equipment under test is connected by plug wire with signal input interface, realizing multichannel simultaneously detects, multichannel output.
2. the mining multichannel leakage latching protection of one as claimed in claim 1 device, it is characterized in that: in described detection comparison module, be provided with hysteresis comparison circuit, described hysteresis comparison circuit is made up of voltage stabilizing didoe ZD1, ZD2, capacitor C 1, C2, C3, resistance R 106, R107, R109, R110, R111, R112, R113, R114, swept resistance POT1, POT2, operational amplifier U2A, U2B and wire jumper LINK1, wire jumper LINK1 is provided with three ports, and the second port of wire jumper LINK1 is that signal input part is connected with equipment under test, one end of the first port contact resistance R111 of described wire jumper LINK1, other end contact resistance R113 one end of resistance R 111, resistance R 113 other end concatenation operation amplifier U2A reverse input ends, operational amplifier U2A is input contact resistance R106 one end in the same way, resistance R 106 other ends connect reference power source Vref1, resistance R 106 and operational amplifier U2A input tap one end contact resistance R107 one end in the same way, resistance R 107 other end concatenation operation amplifier U2A outputs, and tap one end connects the diode D1 of signal output apparatus, between resistance R 111 and resistance R 113, tap one end is connected capacitor C 1 one end, capacitor C 1 other end connects the anodal also ground connection of voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD1 negative pole contact resistance R111 and capacitor C 1 tap one end, resistance R 111 is connected swept resistance POT1 one end with voltage stabilizing didoe ZD1 negative pole tap one end, the swept resistance POT1 other end connects detection power supply,
One end of the 3rd port contact resistance R112 of described wire jumper LINK1, other end contact resistance R114 one end of resistance R 112, resistance R 114 other end concatenation operation amplifier U2B reverse input ends, operational amplifier U2B reverse input end connects detection power supply, operational amplifier U2B reverse input end with detect tap one end between power supply and be connected capacitor C 3 one end, capacitor C 3 other end ground connection, operational amplifier U2B is input contact resistance R109 one end ground connection in the same way, resistance R 109 other ends connect reference power source Vref2, resistance R 109 and operational amplifier U2B input tap one end contact resistance R110 one end in the same way, resistance R 110 other end concatenation operation amplifier U2B outputs, and tap one end connects the diode D2 of signal output apparatus, between resistance R 112 and resistance R 114, tap one end is connected capacitor C 2 one end, capacitor C 2 other ends connect the anodal also ground connection of voltage stabilizing didoe ZD2, between resistance R 112 and voltage stabilizing didoe ZD2 negative pole, one section of tap is connected swept resistance POT2 and connects and detects power supply.
3. the mining multichannel leakage latching protection of one as claimed in claim 1 device, it is characterized in that: in described signal output module, be provided with signal output apparatus, described signal output apparatus is made up of diode D1, D2, D11, LED 1, resistance R 2, R103, R104, triode Q1, Q2 and relay coil K1A, the base stage of described triode Q1 is connected with resistance R 103 one end, and resistance R 103 other ends are connected with diode D2 negative pole; The emitter connecting luminous diode LED1 negative pole of described triode Q1, the anodal contact resistance R2 of LED 1 one end, resistance R 2 one end are connected with diode D1 negative pole, the emitter of described triode Q1 and the equal ground connection of LED 1 negative pole; Collector electrode contact resistance R104 one end of described triode Q1, resistance R 104 other ends connect detection power supply; The base stage of tap one end connecting triode Q2 between the collector electrode of described triode Q1 and resistance R 104, the grounded emitter of triode Q2, collector connection relay coil K1A one end of triode Q2, the relay coil K1A other end connects detection power supply, relay coil K1A is connected diode D11 positive pole with collector electrode tap one end of triode Q2, and diode D11 negative pole connects detection power supply.
4. the mining multichannel leakage latching protection of one as claimed in claim 1 device, it is characterized in that: in described power module, be provided with power circuit, described power circuit is by voltage stabilizing didoe ZD11, Light-Emitting Diode LED6, polar capacitor C16, capacitor C 17 and resistance R 1 form, one end of described resistance R 1 connects detects power output end, described resistance R 1 other end connects Light-Emitting Diode LED6 positive pole, the minus earth of described Light-Emitting Diode LED6, between described resistance R 1 and detection power output end, tap one end is connected capacitor C 17, between described capacitor C 17 and detection power output end, tap one end is connected polar capacitor C16 positive pole, between described polar capacitor C16 positive pole and detection power output end, tap one end is connected voltage stabilizing didoe ZD11 positive pole, described voltage stabilizing didoe ZD11 negative pole, Light-Emitting Diode LED6 negative pole, polar capacitor C16 negative pole, the other end ground connection of capacitor C 17, form four road parallel circuitss.
5. the mining multichannel leakage latching protection of the one as described in claim 3 or 4 device, is characterized in that: described detection power supply is 24Vdc, and installs TVS pipe additional at detection power input.
6. the mining multichannel leakage latching protection of one as claimed in claim 1 device, it is characterized in that: in described reference voltage module, be provided with reference voltage circuit, described reference voltage circuit is made up of two parts, Part I is by resistance R 101, R105, capacitor C 18, C20, polar capacitor C22 and operational amplifier U1A form, connect with resistance R 105 one end in one end of resistance R 101, the other end of resistance R 105 connects detection power supply, the other end ground connection of resistance R 101, tap one end concatenation operation amplifier U1A input in the same way between resistance R 101 and resistance R 105, operational amplifier U1A in the same way between input and resistance R 101 tap one end be connected capacitor C 18 one end, capacitor C 18 other end ground connection, the reverse input end of described operational amplifier U1A connects polar capacitor C22 positive pole, polar capacitor C22 minus earth, the output of described operational amplifier U1A connects one end of capacitor C 20, and tap one end output reference power source Vref1, the other end ground connection of capacitor C 20,
Part II is by resistance R 102, R108, capacitor C 19, C21, C24, polar capacitor C23 and operational amplifier U1B, connect with resistance R 108 one end in one end of resistance R 102, the other end of resistance R 108 connects detection power supply, the other end ground connection of resistance R 102, tap one end concatenation operation amplifier U1B input one end in the same way between resistance R 102 and resistance R 108, operational amplifier U1B is input other end ground connection in the same way, operational amplifier U1B in the same way between input and resistance R 102 tap one end be connected capacitor C 19 one end, capacitor C 19 other end ground connection, reverse input end one end of described operational amplifier U1B connects polar capacitor C23 positive pole, polar capacitor C23 minus earth, the reverse input end other end of described operational amplifier U1B connects detection power supply, and tap one end connects capacitor C 24 ground connection, the output of described operational amplifier U1B connects one end of capacitor C 21, and tap one end output reference power source Vref2, the other end ground connection of capacitor C 21.
7. the mining multichannel leakage latching protection of one as claimed in claim 1 device, is characterized in that: on described housing, be also provided with power supply and malfunction indicator lamp.
8. the mining multichannel leakage latching protection of one as claimed in claim 1 device, is characterized in that: described each signal output interface place, road is all provided with one group and often opens and normally closed passive contact, and described often opening and normally-closed contact independence mutually, without electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420101617.8U CN203747369U (en) | 2014-03-07 | 2014-03-07 | Multipath earth leakage lockout protection device for mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420101617.8U CN203747369U (en) | 2014-03-07 | 2014-03-07 | Multipath earth leakage lockout protection device for mining |
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| Publication Number | Publication Date |
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| CN203747369U true CN203747369U (en) | 2014-07-30 |
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| CN201420101617.8U Expired - Fee Related CN203747369U (en) | 2014-03-07 | 2014-03-07 | Multipath earth leakage lockout protection device for mining |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441603A (en) * | 2019-08-13 | 2019-11-12 | 西安西驰电气股份有限公司 | A kind of earth leakage search/lockout sample circuit and detection method |
| CN112881764A (en) * | 2021-03-18 | 2021-06-01 | 中煤科工集团西安研究院有限公司 | Mining power supply load side short circuit/undervoltage detection protection circuit and method |
-
2014
- 2014-03-07 CN CN201420101617.8U patent/CN203747369U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441603A (en) * | 2019-08-13 | 2019-11-12 | 西安西驰电气股份有限公司 | A kind of earth leakage search/lockout sample circuit and detection method |
| CN110441603B (en) * | 2019-08-13 | 2021-07-20 | 西安西驰电气股份有限公司 | Electric leakage blocking sampling circuit and detection method |
| CN112881764A (en) * | 2021-03-18 | 2021-06-01 | 中煤科工集团西安研究院有限公司 | Mining power supply load side short circuit/undervoltage detection protection circuit and method |
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Granted publication date: 20140730 Termination date: 20160307 |