CN204855588U - Automatic switch protection system - Google Patents
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- CN204855588U CN204855588U CN201520253985.9U CN201520253985U CN204855588U CN 204855588 U CN204855588 U CN 204855588U CN 201520253985 U CN201520253985 U CN 201520253985U CN 204855588 U CN204855588 U CN 204855588U
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Abstract
The utility model belongs to electric power measurement field especially relates to the automatic switch protection system of switching between a high accuracy measurement system who is used for double -bus supply circuit and the voltage transformer secondary cable loop, which comprises a controller, bleeder circuit, failure detector circuit and relay switching circuit, controller and bleeder circuit, failure detector circuit is connected, bleeder circuit is connected with failure detector circuit, failure detector circuit is connected with the relay switching circuit, optical fiber circuit in photoelectric conversion measurement system breaks down, normally under the behavior, at this moment, the system can send acousto -optic warning, measure signal automatic switch -over to voltage transformer secondary cable loop simultaneously, the firm energy measurement is not suffered a loss.
Description
Technical field
The utility model belongs to electric-power metering field, particularly relates to the automatic switching protection system switched between a kind of high-precision measuring system for double-bus feed circuit and voltage transformer secondary cable loop.
Background technology
In the practical application of transformer station, in order to ensure Electrical Safety with stable, circuit more than most of 110KV grade is all adopt double-bus to power, double-bus supply line electric energy meter has special voltage circuit and current circuit, from circuit to electric energy meter, this section of circuit there will be energy loss, in order to improve the precision of electric energy measurement, a kind of opto-electronic conversion metering system of present employing, the principle of work of this system converts the electric current needed in the circuit of metering to light signal, by optical fiber communicating optical signals, when light signal is directed near electric energy meter, again light signal is converted to electric signal, then detect, time but any device all occurs fault, so while device a voltage transformer secondary cable loop in parallel, whether present needs are a set of can have fault by automatic decision opto-electronic conversion metering system, and the system of the measuring-signal that can automatically switch.
Summary of the invention
The automatic switching protection system switched between a kind of high-precision measuring system for double-bus feed circuit that the purpose of this utility model is to overcome deficiency of the prior art and invents and voltage transformer secondary cable loop.
The utility model is achieved in that a kind of automatic switching protection system; it is characterized in that: comprise controller, bleeder circuit, failure detector circuit and relay commutation circuit; controller is connected with bleeder circuit, failure detector circuit; bleeder circuit is connected with failure detector circuit, and failure detector circuit is connected with relay commutation circuit.
Described bleeder circuit comprises resistance R57, resistance R59, resistance R67, resistance R68, resistance R60, resistance R89, electric capacity C29 and electric capacity C30, resistance R57 is all connected with one end of same power supply with one end of resistance R89, the other end of resistance R57 is connected with one end of resistance R59, the other end of resistance R59 is as a voltage output end, this voltage output end is connected with failure detector circuit, the other end of resistance R59 simultaneously respectively with one end of resistance R67, the other end of electric capacity C29 is connected, the other end of resistance R67, while the other end ground connection of electric capacity C29 all with one end of resistance R68, one end of electric capacity C30 is connected, the other end of resistance R68 is as another voltage output end, this voltage output end is connected with failure detector circuit, the other end of resistance R68 simultaneously with the other end of electric capacity C30, one end of resistance R60 is connected, the other end of resistance R60 is connected with the other end of resistance R89, the voltage of two voltage output ends in bleeder circuit, one higher than the voltage after reduction in circuit in three-phase, another is lower than the voltage after reduction in circuit in three-phase.
Described failure detector circuit comprise A, B, C rectified three-phase circuit, A, B, C three-phase voltage comparator circuit and and gate control circuit, A commutating phase circuit comprises resistance R50 and electric capacity C28, B commutating phase circuit comprises resistance R64 and electric capacity C31, C commutating phase circuit comprises resistance R79 and electric capacity C32, A phase voltage comparator circuit comprises twin voltage comparer U10A, twin voltage comparer U10B, B phase voltage comparator circuit comprises twin voltage comparer U12A, twin voltage comparer U12B, and C phase voltage comparator circuit comprises twin voltage comparer U14A, twin voltage comparer U14B, resistance R92 is comprised with gate control circuit, resistance R93, resistance R94, resistance R95, resistance R96, resistance R97, resistance R70, resistance R21, resistance R25, diode D26, diode D29, diode D31, diode D34, diode D36 and diode D39, in the A phase resistance R50 a termination reduction after A phase current, the other end of resistance R50 respectively with one end of electric capacity C28, the positive input of twin voltage comparer U10A, the positive input of twin voltage comparer U10B is connected, the other end ground connection of electric capacity C28, the reverse input end of twin voltage comparer U10A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U10B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U10A is connected with the negative pole of diode D29 with one end of resistance R92 respectively, the other end of resistance R92 is connected with controller, the output terminal of twin voltage comparer U10B is connected with the negative pole of diode D26 with one end of resistance R93 respectively, and the other end of resistance R93 is connected with controller, B phase current after a termination reduction of the middle resistance R64 of B phase, the other end of resistance R64 respectively with one end of electric capacity C31, the positive input of twin voltage comparer U12A, the positive input of twin voltage comparer U12B is connected, the other end ground connection of electric capacity C31, the reverse input end of twin voltage comparer U12A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U12B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U12A is connected with the negative pole of diode D34 with one end of resistance R95 respectively, the other end of resistance R95 is connected with controller, the output terminal of twin voltage comparer U12B is connected with the negative pole of diode D31 with one end of resistance R94 respectively, the other end of resistance R94 is connected with controller, C phase current after a termination reduction of the middle resistance R79 of C phase, the other end of resistance R79 respectively with one end of electric capacity C32, the positive input of twin voltage comparer U14A, the positive input of twin voltage comparer U14B is connected, the other end ground connection of electric capacity C32, the reverse input end of twin voltage comparer U14A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U14B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U14A is connected with the negative pole of diode D39 with one end of resistance R97 respectively, the other end of resistance R97 is connected with controller, the output terminal of twin voltage comparer U14B is connected with the negative pole of diode D36 with one end of resistance R96 respectively, the other end of resistance R96 is connected with controller, the positive pole of the positive pole of the positive pole of diode D26, the positive pole of diode D29, diode D31, the positive pole of diode D34, diode D36, the positive pole of diode D39 are all connected with the positive pole of diode D46, one end of resistance R70, one end of resistance R21, the negative pole of diode D46 connects controller, another termination 3.3V voltage of resistance R70, the other end of resistance R21 is connected with relay commutation circuit, the other end of resistance R21 is connected with one end of resistance R25 simultaneously, the other end ground connection of resistance R25.
Described relay commutation circuit comprises N-MOS pipe VT4, N-MOS pipe VT5, voltage stabilizing diode D12, diode D9, resistance R29, resistance R90, electric capacity C29, LED, electromagnetic relay SW1 and electromagnetic relay SW3, N-MOS pipe VT4, the grid of N-MOS pipe VT5 is all connected with one end of resistance R21 in failure detector circuit, Header2P2 has been arranged in parallel between the drain electrode of N-MOS pipe VT4 and source electrode, the source electrode ground connection simultaneously of N-MOS pipe VT4, the substrate lead ground connection of N-MOS pipe VT4, the drain electrode of N-MOS pipe VT4 simultaneously with the positive pole of diode D9, one end of electromagnetic relay SW1 solenoid is connected with one end of electromagnetic relay SW3 solenoid, the positive pole of diode D9 meets power supply VCC, the other end of electromagnetic relay SW1 solenoid and the other end of electromagnetic relay SW3 solenoid all meet power supply VCC, the stationary contact of electromagnetic relay SW1 and electromagnetic relay SW3 is divided into two input groups, electromagnetic relay SW1 is connected with metering end with the moving contact of electromagnetic relay SW3, the drain electrode of N-MOS pipe VT5 respectively with the positive pole of voltage stabilizing diode D12, one end of resistance R90, one end of resistance R29, LED is connected, the source electrode of N-MOS pipe VT5 is connected with the negative pole of voltage stabilizing diode D12, ground connection while the source electrode of N-MOS pipe VT5 is connected with the negative pole of voltage stabilizing diode D12, another termination power of resistance R90, the other end of resistance R29 respectively with controller, one end of electric capacity C49 is connected, the other end ground connection of electric capacity C49.
The model of described twin voltage comparer U10A, twin voltage comparer U10B, twin voltage comparer U12A, twin voltage comparer U12B, twin voltage comparer U14A, twin voltage comparer U14B is LM393; The model of N-MOS pipe VT4, N-MOS pipe VT5 is SI2303; The model of electromagnetic relay SW1 and electromagnetic relay SW3 is G5V-2-H1.
The utility model has the following advantages:
When the optical fiber circuit in opto-electronic conversion metering system break down, in cisco unity malfunction situation, at this moment system can send sound and light alarm, metering signal automatically switches to voltage transformer secondary cable loop simultaneously, ensures that electric energy metrical is not suffered a loss.
Automatic switching protection system designs for line fault, when in conjunction with secondary circuit for subsequent use, can set up switch protecting network.Facts have proved, automatic switching protection fast and reliable, safety are flexible, recovery capability is strong, are a set of comparatively economic solutions.Loop fault automatic switch-over circuit can realize the on-line monitoring of circuit, and failure problems is made a response rapidly, reaction velocity is at several milliseconds, ensure that power department metering is not suffered a loss simultaneously, hardware is achieved controlled at the design aspect of circuit, software can also can be forced to intervene, and adds the reliability of system.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is the circuit diagram of bleeder circuit in the utility model.
Fig. 3 is the circuit diagram of the utility model repeat circuit commutation circuit.
Fig. 4 is the circuit diagram of failure detector circuit in the utility model.
Embodiment
Embodiment:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4; a kind of automatic switching protection system; comprise controller 1, bleeder circuit 2, failure detector circuit 3 and relay commutation circuit 4; controller 1 is connected with bleeder circuit 2, failure detector circuit 3; bleeder circuit 2 is connected with failure detector circuit 3; failure detector circuit 3 is connected with relay commutation circuit 4
Described bleeder circuit comprises resistance R57, resistance R59, resistance R67, resistance R68, resistance R60, resistance R89, electric capacity C29 and electric capacity C30, resistance R57 is all connected with one end of same power supply with one end of resistance R89, the other end of resistance R57 is connected with one end of resistance R59, the other end of resistance R59 is as a voltage output end, export 1.25V voltage, this voltage output end is connected with failure detector circuit, the other end of resistance R59 simultaneously respectively with one end of resistance R67, the other end of electric capacity C29 is connected, the other end of resistance R67, while the other end ground connection of electric capacity C29 all with one end of resistance R68, one end of electric capacity C30 is connected, the other end of resistance R68 is as another voltage output end, export 2.08V voltage, this voltage output end is connected with failure detector circuit, the other end of resistance R68 simultaneously with the other end of electric capacity C30, one end of resistance R60 is connected, the other end of resistance R60 is connected with the other end of resistance R89.
Described failure detector circuit comprise A, B, C rectified three-phase circuit, A, B, C three-phase voltage comparator circuit and and gate control circuit, A commutating phase circuit comprises resistance R50 and electric capacity C28, B commutating phase circuit comprises resistance R64 and electric capacity C31; C commutating phase circuit comprises resistance R79 and electric capacity C32, A phase voltage comparator circuit comprises twin voltage comparer U10A, twin voltage comparer U10B, B phase voltage comparator circuit comprises twin voltage comparer U12A, twin voltage comparer U12B, and C phase voltage comparator circuit comprises twin voltage comparer U14A, twin voltage comparer U14B; Comprise resistance R92, resistance R93, resistance R94, resistance R95, resistance R96, resistance R97, resistance R70, resistance R21, resistance R25, diode D26, diode D29, diode D31, diode D34, diode D36 and diode D39 with gate control circuit, wherein the model of twin voltage comparer U10A, twin voltage comparer U10B, twin voltage comparer U12A, twin voltage comparer U12B, twin voltage comparer U14A, twin voltage comparer U14B is LM393.
A phase current after a termination reduction of the middle resistance R50 of A phase, the other end of resistance R50 respectively with one end of electric capacity C28, the positive input of twin voltage comparer U10A, the positive input of twin voltage comparer U10B is connected, the other end ground connection of electric capacity C28, the reverse input end of twin voltage comparer U10A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U10B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U10A is connected with the negative pole of diode D29 with one end of resistance R92 respectively, the other end of resistance R92 is connected with controller, the output terminal of twin voltage comparer U10B is connected with the negative pole of diode D26 with one end of resistance R93 respectively, the other end of resistance R93 is connected with controller,
B phase current after a termination reduction of the middle resistance R64 of B phase, the other end of resistance R64 respectively with one end of electric capacity C31, the positive input of twin voltage comparer U12A, the positive input of twin voltage comparer U12B is connected, the other end ground connection of electric capacity C31, the reverse input end of twin voltage comparer U12A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U12B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U12A is connected with the negative pole of diode D34 with one end of resistance R95 respectively, the other end of resistance R95 is connected with controller, the output terminal of twin voltage comparer U12B is connected with the negative pole of diode D31 with one end of resistance R94 respectively, resistance R94 is connected with controller,
C phase current after a termination reduction of the middle resistance R79 of C phase, the other end of resistance R79 respectively with one end of electric capacity C32, the positive input of twin voltage comparer U14A, the positive input of twin voltage comparer U14B is connected, the other end ground connection of electric capacity C32, the reverse input end of twin voltage comparer U14A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U14B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U14A is connected with the negative pole of diode D39 with one end of resistance R97 respectively, the other end of resistance R97 is connected with controller, the output terminal of twin voltage comparer U14B is connected with the negative pole of diode D36 with one end of resistance R96 respectively, the other end of resistance R96 is connected with controller,
The positive pole of the positive pole of the positive pole of diode D26, the positive pole of diode D29, diode D31, the positive pole of diode D34, diode D36, the positive pole of diode D39 are all connected with the positive pole of diode D46, one end of resistance R70, one end of resistance R21, the negative pole of diode D46 connects controller, another termination 3.3V voltage of resistance R70, the other end of resistance R21 is connected with relay commutation circuit, the other end of resistance R21 is connected with one end of resistance R25 simultaneously, the other end ground connection of resistance R25;
Described relay commutation circuit comprises N-MOS pipe VT4, N-MOS pipe VT5, voltage stabilizing diode D12, diode D9, resistance R29, resistance R90, electric capacity C29, LED, electromagnetic relay SW1 and electromagnetic relay SW3, wherein, the model of N-MOS pipe VT4, N-MOS pipe VT5 is SI2303, the model of electromagnetic relay SW1 and electromagnetic relay SW3 is G5V-2-H1, described N-MOS pipe VT4, the grid of N-MOS pipe VT5 is all connected with one end of resistance R21 in failure detector circuit, Header2P2 has been arranged in parallel between the drain electrode of N-MOS pipe VT4 and source electrode, the source electrode ground connection simultaneously of N-MOS pipe VT4, the substrate lead ground connection of N-MOS pipe VT4, the drain electrode of N-MOS pipe VT4 simultaneously with the positive pole of diode D9, one end of electromagnetic relay SW1 solenoid is connected with one end of electromagnetic relay SW3 solenoid, the positive pole of diode D9 meets power supply VCC, the other end of electromagnetic relay SW1 solenoid and the other end of electromagnetic relay SW3 solenoid all meet power supply VCC, the stationary contact of electromagnetic relay SW1 and electromagnetic relay SW3 is divided into outa, outb, outc input group and A1, B1, C1 input group, the moving contact of electromagnetic relay SW1 and electromagnetic relay SW3 connects metering end, the drain electrode of N-MOS pipe VT5 respectively with the positive pole of voltage stabilizing diode D12, one end of resistance R90, one end of resistance R29, LED is connected, the source electrode of N-MOS pipe VT5 is connected with the negative pole of voltage stabilizing diode D12, ground connection while the source electrode of N-MOS pipe VT5 is connected with the negative pole of voltage stabilizing diode D12, another termination power of resistance R90, the other end of resistance R29 respectively with controller, one end of electric capacity C49 is connected, the other end ground connection of electric capacity C49.
If Fig. 3 is relay commutation circuit, Fig. 4 is fault detect and control circuit.In optical circuit fault automatic switch-over circuit, first need to carry out fault detect, as shown in Figure 2, pass through bleeder circuit, produce the reference voltage of 1.25V and 2.08V, as the benchmark of overvoltage and under-voltage fault detect, 1.25V and 2.08V voltage is 20% downward shift of normal working voltage 57.7V.As Fig. 3, ABC three-phase voltage after amplifying reduction is passed through rectification circuit, voltage after process and 1.25V, 2.08V are compared, when the voltage of three-phase is all between 1.25V to 2.08V, be considered as normal work, now 7 pin of LM393 are high level, and falut is high level, now, as shown in Figure 3, SI2302 conducting, relay adhesive, metering be the voltage of outa, outb, outc side, LED2 is low level, pilot lamp does not work, and QIEHUAN is low level and is input in CPU, controls LCD screen display.When the voltage of three-phase has that wherein a phase is not between 1.25V to 2.08V, then be considered as fault, now 7 pin of LM393 are low level, and falut is low level, now, SI2302 ends, relay not adhesive, metering be the voltage of A1, B1, C1 side, LED2 is high level, pilot lamp is bright, and QIEHUAN is high level and is input in controller, controls LCD screen display and switches.
In the fault detect and control circuit circuit of Fig. 4, the connecting circuit of D26, D29, D31, D34, D36, D39 is equivalent to one and door, detect if be used in three-phase and have one to break down mutually, just can the switching of pilot relay immediately, the KONGZHI signal of controller is mainly used in software control, other functions of some software-controllable can be realized, also may be used for software force handoff.
In the relay commutation circuit of Fig. 3, mainly use the switching function of N-MOS pipe, be used for the state of pilot relay, meanwhile, sent indicator signal and also have CPU look-at-me.Here voltage stabilizing diode D12 provides protection to clamp the voltage at 4.3V for LED.
Claims (2)
1. an automatic switching protection system; it is characterized in that: comprise controller, bleeder circuit, failure detector circuit and relay commutation circuit; controller is connected with bleeder circuit, failure detector circuit; bleeder circuit is connected with failure detector circuit; failure detector circuit is connected with relay commutation circuit
Described bleeder circuit comprises resistance R57, resistance R59, resistance R67, resistance R68, resistance R60, resistance R89, electric capacity C29 and electric capacity C30, resistance R57 is all connected with one end of same power supply with one end of resistance R89, the other end of resistance R57 is connected with one end of resistance R59, the other end of resistance R59 is as a voltage output end, this voltage output end is connected with failure detector circuit, the other end of resistance R59 simultaneously respectively with one end of resistance R67, the other end of electric capacity C29 is connected, the other end of resistance R67, while the other end ground connection of electric capacity C29 all with one end of resistance R68, one end of electric capacity C30 is connected, the other end of resistance R68 is as another voltage output end, this voltage output end is connected with failure detector circuit, the other end of resistance R68 simultaneously with the other end of electric capacity C30, one end of resistance R60 is connected, the other end of resistance R60 is connected with the other end of resistance R89, the voltage of two voltage output ends in bleeder circuit, one higher than the voltage after reduction in circuit in three-phase, another is lower than the voltage after reduction in circuit in three-phase,
Described failure detector circuit comprise A, B, C rectified three-phase circuit, A, B, C three-phase voltage comparator circuit and and gate control circuit, A commutating phase circuit comprises resistance R50 and electric capacity C28, B commutating phase circuit comprises resistance R64 and electric capacity C31; C commutating phase circuit comprises resistance R79 and electric capacity C32, A phase voltage comparator circuit comprises twin voltage comparer U10A, twin voltage comparer U10B, B phase voltage comparator circuit comprises twin voltage comparer U12A, twin voltage comparer U12B, and C phase voltage comparator circuit comprises twin voltage comparer U14A, twin voltage comparer U14B; Resistance R92, resistance R93, resistance R94, resistance R95, resistance R96, resistance R97, resistance R70, resistance R21, resistance R25, diode D26, diode D29, diode D31, diode D34, diode D36 and diode D39 is comprised with gate control circuit
A phase current after a termination reduction of the middle resistance R50 of A phase, the other end of resistance R50 respectively with one end of electric capacity C28, the positive input of twin voltage comparer U10A, the positive input of twin voltage comparer U10B is connected, the other end ground connection of electric capacity C28, the reverse input end of twin voltage comparer U10A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U10B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U10A is connected with the negative pole of diode D29 with one end of resistance R92 respectively, the other end of resistance R92 is connected with controller, the output terminal of twin voltage comparer U10B is connected with the negative pole of diode D26 with one end of resistance R93 respectively, the other end of resistance R93 is connected with controller,
B phase current after a termination reduction of the middle resistance R64 of B phase, the other end of resistance R64 respectively with one end of electric capacity C31, the positive input of twin voltage comparer U12A, the positive input of twin voltage comparer U12B is connected, the other end ground connection of electric capacity C31, the reverse input end of twin voltage comparer U12A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U12B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U12A is connected with the negative pole of diode D34 with one end of resistance R95 respectively, the other end of resistance R95 is connected with controller, the output terminal of twin voltage comparer U12B is connected with the negative pole of diode D31 with one end of resistance R94 respectively, the other end of resistance R94 is connected with controller,
C phase current after a termination reduction of the middle resistance R79 of C phase, the other end of resistance R79 respectively with one end of electric capacity C32, the positive input of twin voltage comparer U14A, the positive input of twin voltage comparer U14B is connected, the other end ground connection of electric capacity C32, the reverse input end of twin voltage comparer U14A is connected with a voltage output end in bleeder circuit, the reverse input end of twin voltage comparer U14B is connected with another voltage output end in bleeder circuit, the output terminal of twin voltage comparer U14A is connected with the negative pole of diode D39 with one end of resistance R97 respectively, the other end of resistance R97 is connected with controller, the output terminal of twin voltage comparer U14B is connected with the negative pole of diode D36 with one end of resistance R96 respectively, the other end of resistance R96 is connected with controller,
The positive pole of the positive pole of the positive pole of diode D26, the positive pole of diode D29, diode D31, the positive pole of diode D34, diode D36, the positive pole of diode D39 are all connected with the positive pole of diode D46, one end of resistance R70, one end of resistance R21, the negative pole of diode D46 connects controller, another termination 3.3V voltage of resistance R70, the other end of resistance R21 is connected with relay commutation circuit, the other end of resistance R21 is connected with one end of resistance R25 simultaneously, the other end ground connection of resistance R25;
Described relay commutation circuit comprises N-MOS pipe VT4, N-MOS pipe VT5, voltage stabilizing diode D12, diode D9, resistance R29, resistance R90, electric capacity C29, LED, electromagnetic relay SW1 and electromagnetic relay SW3, N-MOS pipe VT4, the grid of N-MOS pipe VT5 is all connected with one end of resistance R21 in failure detector circuit, Header2P2 has been arranged in parallel between the drain electrode of N-MOS pipe VT4 and source electrode, the source electrode ground connection simultaneously of N-MOS pipe VT4, the substrate lead ground connection of N-MOS pipe VT4, the drain electrode of N-MOS pipe VT4 simultaneously with the positive pole of diode D9, one end of electromagnetic relay SW1 solenoid is connected with one end of electromagnetic relay SW3 solenoid, the positive pole of diode D9 meets power supply VCC, the other end of electromagnetic relay SW1 solenoid and the other end of electromagnetic relay SW3 solenoid all meet power supply VCC, the stationary contact of electromagnetic relay SW1 and electromagnetic relay SW3 is divided into two input groups, electromagnetic relay SW1 is connected with metering end with the moving contact of electromagnetic relay SW3, the drain electrode of N-MOS pipe VT5 respectively with the positive pole of voltage stabilizing diode D12, one end of resistance R90, one end of resistance R29, LED is connected, the source electrode of N-MOS pipe VT5 is connected with the negative pole of voltage stabilizing diode D12, ground connection while the source electrode of N-MOS pipe VT5 is connected with the negative pole of voltage stabilizing diode D12, another termination power of resistance R90, the other end of resistance R29 respectively with controller, one end of electric capacity C49 is connected, the other end ground connection of electric capacity C49.
2. automatic switching protection system according to claim 1, it is characterized in that, the model of described twin voltage comparer U10A, twin voltage comparer U10B, twin voltage comparer U12A, twin voltage comparer U12B, twin voltage comparer U14A, twin voltage comparer U14B is LM393; The model of N-MOS pipe VT4, N-MOS pipe VT5 is SI2303; The model of electromagnetic relay SW1 and electromagnetic relay SW3 is G5V-2-H1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520253985.9U CN204855588U (en) | 2015-04-24 | 2015-04-24 | Automatic switch protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520253985.9U CN204855588U (en) | 2015-04-24 | 2015-04-24 | Automatic switch protection system |
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| Publication Number | Publication Date |
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| CN204855588U true CN204855588U (en) | 2015-12-09 |
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| CN201520253985.9U Expired - Fee Related CN204855588U (en) | 2015-04-24 | 2015-04-24 | Automatic switch protection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870298A (en) * | 2017-11-29 | 2018-04-03 | 深圳市锐能微科技有限公司 | Circuit parameter detection circuit, method and the electric energy meter of a kind of bleeder circuit |
-
2015
- 2015-04-24 CN CN201520253985.9U patent/CN204855588U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870298A (en) * | 2017-11-29 | 2018-04-03 | 深圳市锐能微科技有限公司 | Circuit parameter detection circuit, method and the electric energy meter of a kind of bleeder circuit |
| CN107870298B (en) * | 2017-11-29 | 2023-09-05 | 深圳市锐能微科技有限公司 | Circuit parameter detection circuit and method of voltage dividing circuit and electric energy meter |
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