CN204167869U - A kind of Three phase overvoltage/undervoltage protection switch - Google Patents
A kind of Three phase overvoltage/undervoltage protection switch Download PDFInfo
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- CN204167869U CN204167869U CN201420340793.7U CN201420340793U CN204167869U CN 204167869 U CN204167869 U CN 204167869U CN 201420340793 U CN201420340793 U CN 201420340793U CN 204167869 U CN204167869 U CN 204167869U
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Abstract
The utility model discloses a kind of Three phase overvoltage/undervoltage protection switch, comprise shell, indicator light, outlet terminal, input terminal, indicator light is two, is respectively: relay indicating light and malfunction indicator lamp; Described input terminal A phase, B phase, C connect three-phase 380 volts of power supplys; Power supply processing circuit, intelligent identifying circuit, break-make control relay and warning circuit, input detecting voltage by three phase circuit and output voltage three-phase lack phase testing circuit is provided with in described housing; Described outlet terminal connects power consumption equipment.The utility model adopts sampling input three-phase voltage and output voltage phase shortage situation simultaneously, and by sampling, each phase voltage allows the comparison of high-low voltage to identify whether to have the generation of overvoltage/undervoltage state with setting.
Description
Technical field
The utility model belongs to appliance switch automatic control technology field, is applicable to the power supply control of low voltage power distribution network.
Background technology
At present, in supply line when overvoltage/undervoltage fault occurs, overvoltage/undervoltage control switch should disconnect.When supply line's service restoration is normal, overvoltage/undervoltage control switch should close automatically again.In current three-phase overvoltage/undervoltage control switch, general employing three magnetic latching relays are as power contact, adopt electronic circuit to detect three-phase primary voltage, judge whether to produce overvoltage or the generation of under-voltage failure condition, the control that disconnects or close can be carried out easily.But a major defect is: the shortcoming that cannot judge relay itself, if relay itself has fault, not only the object of overvoltage/undervoltage protection power consumption equipment can not be reached, produce even more serious phase shortage accident on the contrary, cause power consumption equipment to damage in short-term.In view of above this practicality of problem adopts the solution detecting the outlet of three phase mains inlet wire simultaneously.
Utility model content
In order to overcome above-mentioned technical problem, the utility model provide a kind of cost lower, accurately can monitor in overvoltage/undervoltage switch and control the device that three-phase disconnects or whether closed relay damages, the technical scheme of employing is as follows:
A kind of Three phase overvoltage/undervoltage protection switch, comprises shell, indicator light, outlet terminal, input terminal (4).Indicator light is two, is respectively: relay indicating light and malfunction indicator lamp; The A phase of described input terminal, B phase, C connect three-phase 380 volts of power supplys; Power supply processing circuit, intelligent identifying circuit, break-make control relay and warning circuit, three-phase input voltage testing circuit and output voltage three-phase lack phase testing circuit is provided with in described shell; Described outlet terminal connects power consumption equipment; Relay indicating light in described indicator light---when computer chip is working properly, indicator light is bright, and light is green; Malfunction indicator lamp in described indicator light---when switch is in off-state, indicator light is bright, and light is red; Described input detecting voltage by three phase circuit and output voltage three-phase lack phase testing circuit, form three-phase input voltage testing circuit by resistance R1-R6, diode V7-V9, electric capacity C4-C6; Output voltage three-phase lack phase testing circuit is formed by resistance R8-R13, voltage-stabiliser tube V11-V13; Described power supply processing circuit is made up of diode V1-V6, electric capacity C1-C3, electric capacity C7-C9, pressurizer U2, voltage-stabiliser tube V10; Diode V1-V6 forms three-phase bridge rectifier circuit, and electric capacity C1-C3 is current limiting capacitance, and electric capacity C7-C9 is filter capacitor, and pressurizer U2 exports stable direct-current working volts, and voltage-stabiliser tube V10 is that U2 inputs overvoltage protection; Described break-make control relay and warning circuit, warning circuit is formed by resistance R14-R15, light-emitting diode G and R, on-off control circuit is formed by resistance R16-R21, triode V14-V19, magnetic latching relay, when computer chip output port 27 exports positive pulse, three magnetic latching relays disconnect, when computer chip output port 28 exports positive pulse, three magnetic latching relays close; Described intelligent identifying circuit is made up of computer chip U1, crystal oscillator HZ, resistance R7, and crystal oscillator HZ is the external oscillation circuit of computer chip U1, and resistance R7 is the reset pull-up resistor of U1.
The beneficial effects of the utility model can be learnt according to describing of such scheme: the utility model adopts sampling input three-phase voltage and output voltage phase shortage situation simultaneously, and by sampling, each phase voltage allows the comparison of high-low voltage to identify whether to have the generation of overvoltage/undervoltage state with setting; If meet the cut-out condition of setting, then disconnect relay when being originally "on" position.When the combined floodgate condition of satisfied setting, when originally in off-state, again close a floodgate after time delay.If at any time there is three-phase to export non-full-phase state, then carry out reverse operating: namely disconnect and become closed, close and become disconnection, do not comprehend input voltage situation most, report to the police simultaneously.
Accompanying drawing explanation
Fig. 1 is this practical surface structure schematic diagram;
Fig. 2 is circuit block diagram of the present utility model;
Fig. 3 is physical circuit figure of the present utility model;
Fig. 4 is workflow diagram of the present utility model;
Embodiment
With reference to Figure of description 1-3 to a kind of Three phase overvoltage/undervoltage protection switch of the present utility model, be described in detail below.
A kind of Three phase overvoltage/undervoltage protection switch, comprise shell 1, indicator light 2, outlet terminal 3, input terminal 4, indicator light 2 are two, are respectively: relay indicating light and malfunction indicator lamp; The A phase of described input terminal 4, B phase, C connect three-phase 380 volts of power supplys; Power supply processing circuit, intelligent identifying circuit, break-make control relay and warning circuit, three-phase input voltage testing circuit and output voltage three-phase lack phase testing circuit is provided with in described shell 1; Described outlet terminal 3 connects power consumption equipment; Relay indicating light in described indicator light 2---when computer chip is working properly, indicator light is bright, and light is green; Malfunction indicator lamp in described indicator light 2---when switch is in off-state, indicator light is bright, and light is red; Described input detecting voltage by three phase circuit and output voltage three-phase lack phase testing circuit, form three-phase input voltage testing circuit by resistance R1-R6, diode V7-V9, electric capacity C4-C6; Output voltage three-phase lack phase testing circuit is formed by resistance R8-R13, voltage-stabiliser tube V11-V13; Described power supply processing circuit is made up of diode V1-V6, electric capacity C1-C3, electric capacity C7-C9, pressurizer U2, voltage-stabiliser tube V10; Diode V1-V6 forms three-phase bridge rectifier circuit, and electric capacity C1-C3 is current limiting capacitance, and electric capacity C7-C9 is filter capacitor, and pressurizer U2 exports stable direct-current working volts, and voltage-stabiliser tube V10 is that U2 inputs overvoltage protection; Described break-make control relay and warning circuit, warning circuit is formed by resistance R14-R15, light-emitting diode G and R, on-off control circuit is formed by resistance R16-R21, triode V14-V19, magnetic latching relay, when computer chip output port 27 exports positive pulse, three magnetic latching relays disconnect, when computer chip output port 28 exports positive pulse, three magnetic latching relays close; Described intelligent identifying circuit is made up of computer chip U1, crystal oscillator HZ, resistance R7, and crystal oscillator HZ is the external oscillation circuit of computer chip U1, and resistance R7 is the reset pull-up resistor of U1.
With reference to Fig. 4, the course of work of the present utility model is described further.
Described three-phase primary voltage testing circuit perception three-phase voltage situation of change, by three-phase outlet lack detection circuit perception three-phase lack phase situation, measured by intelligent identifying circuit, analyze, judge, export and control to switch magnetic latching relay work, reach the object that magnetic latching relay ensures three phase electric equipment not phase shortage under undesirable situation; Described three-phase outlet lack detection circuit perception three-phase lack phase situation; Described power supply processing circuit produces as exchanging input the direct voltage controlling internal work by the three-phase electricity of switch access after treatment; Described on-off control circuit is as power component with magnetic latching relay.
The above, be only embodiment of the present utility model, and those of ordinary skill in the art are in scope of the present utility model, and the change that can expect easily, within the protection range that all should be encompassed in utility model.
Claims (1)
1. a Three phase overvoltage/undervoltage protection switch, comprise shell (1), indicator light (2), outlet terminal (3), input terminal (4), it is characterized in that: indicator light (2) is two, is respectively: relay indicating light and malfunction indicator lamp; The A phase of described input terminal (4), B phase, C connect three-phase.380 volts of power supplys; Power supply processing circuit, intelligent identifying circuit, break-make control relay and warning circuit, three-phase input voltage testing circuit and output voltage three-phase lack phase testing circuit is provided with in described shell (1); Described outlet terminal (3) connects power consumption equipment; In described indicator light (2) relay indicating light---when computer chip is working properly, indicator light is bright, light is green; Malfunction indicator lamp in described indicator light (2)---when switch is in off-state, indicator light is bright, and light is red; Described three-phase input voltage testing circuit and output voltage three-phase lack phase testing circuit, form three-phase input voltage testing circuit by resistance R1-R6, diode V7-V9, electric capacity C4-C6; Output voltage three-phase lack phase testing circuit is formed by resistance R8-R13, voltage-stabiliser tube V11-V13; Described power supply processing circuit is made up of diode V1-V6, electric capacity C1-C3, electric capacity C7-C9, pressurizer U2, voltage-stabiliser tube V10; Diode V1-V6 forms three-phase bridge rectifier circuit, and electric capacity C1-C3 is current limiting capacitance, and electric capacity C7-C9 is filter capacitor, and pressurizer U2 exports stable direct-current working volts, and voltage-stabiliser tube V10 is that U2 inputs overvoltage protection; Described break-make control relay and warning circuit, warning circuit is formed by resistance R14-R15, light-emitting diode G and R, on-off control circuit is formed by resistance R16-R21, triode V14-V19, magnetic latching relay, when computer chip output port 27 exports positive pulse, three magnetic latching relays disconnect, when computer chip output port 28 exports positive pulse, three magnetic latching relays close; Described intelligent identifying circuit is made up of computer chip U1, crystal oscillator HZ, resistance R7, and crystal oscillator HZ is the external oscillation circuit of computer chip U1, and resistance R7 is the reset pull-up resistor of U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420340793.7U CN204167869U (en) | 2014-06-25 | 2014-06-25 | A kind of Three phase overvoltage/undervoltage protection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420340793.7U CN204167869U (en) | 2014-06-25 | 2014-06-25 | A kind of Three phase overvoltage/undervoltage protection switch |
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| Publication Number | Publication Date |
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| CN204167869U true CN204167869U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420340793.7U Active CN204167869U (en) | 2014-06-25 | 2014-06-25 | A kind of Three phase overvoltage/undervoltage protection switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967478A (en) * | 2015-06-30 | 2015-10-07 | 国网山东省电力公司济南供电公司 | Multipath light splitting adapter for testing optical power for intelligent transformer station |
-
2014
- 2014-06-25 CN CN201420340793.7U patent/CN204167869U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967478A (en) * | 2015-06-30 | 2015-10-07 | 国网山东省电力公司济南供电公司 | Multipath light splitting adapter for testing optical power for intelligent transformer station |
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