CN204374385U - Electric energy meter user end disconnecting link folding testing circuit - Google Patents
Electric energy meter user end disconnecting link folding testing circuit Download PDFInfo
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- CN204374385U CN204374385U CN201520077587.6U CN201520077587U CN204374385U CN 204374385 U CN204374385 U CN 204374385U CN 201520077587 U CN201520077587 U CN 201520077587U CN 204374385 U CN204374385 U CN 204374385U
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Abstract
The utility model discloses a kind of electric energy meter user end disconnecting link folding testing circuit, comprise disconnecting link testing circuit and relay test circuit, disconnecting link testing circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode of high pressure, low-leakage current pipe and an isolation and signal output apparatus, and relay test circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode of high pressure, low-leakage current pipe and No. two isolation and signal output apparatus; One input end of disconnecting link testing circuit is connected with the voltage input end of live wire relay, zero line relay, and its another input end is connected with the output terminal of live wire relay, zero line relay, and its output terminal is connected with MCU.The input end of relay test circuit is connected with the output terminal of live wire relay, zero line relay, and its output terminal is connected with MCU.The utility model realizes the tripping operation to user side disconnecting link, the function detected of closing a floodgate by table meter end ball bearing made using.
Description
Technical field
The utility model relates to a kind of disconnecting link folding testing circuit, particularly a kind of electric energy meter user end disconnecting link folding testing circuit.
Background technology
When the live wire relay K 1 of electric energy meter, zero line relay K 2 all tripping, judge the tripping operation of user side disconnecting link K3, "on" position be a very difficult problem, at present the temporary design not finding similar functions.
Utility model content
The purpose of this utility model is to provide a kind of electric energy meter user end disconnecting link folding testing circuit that can effectively solve because of user side disconnecting link Rig up error or the improper electric shock problem caused of user side switch operation.
This electric energy meter user end disconnecting link folding testing circuit that the utility model provides, comprise disconnecting link testing circuit and relay test circuit, disconnecting link testing circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode of high pressure, low-leakage current pipe and an isolation and signal output apparatus, and relay test circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode of high pressure, low-leakage current pipe and No. two isolation and signal output apparatus;
The voltage input end of electric energy meter zero line relay is connected with the output terminal of this relay by series resistance circuit in disconnecting link testing circuit; The voltage input end of electric energy meter live wire relay is connected with the negative electrode of the reverse withstand voltage diode of high pressure by another resistance in series circuit in disconnecting link testing circuit, the anode of this is withstand voltage diode is connected with the output terminal of this relay with the input end of signal output apparatus via an isolation, the output terminal of this relay is also connected with the anode of low-leakage current pipe, and the negative electrode of low-leakage current pipe is connected with the negative electrode of the reverse withstand voltage diode of disconnecting link testing circuit mesohigh; An isolation is connected with power supply and MCU respectively with the output terminal of signal output apparatus, for exporting user side breaker tripping and closing condition adjudgement signal;
The output terminal of live wire relay is isolated by series resistance circuit in relay test circuit be connected with the input end of signal output apparatus with No. two, the output terminal of zero line relay is isolated by another resistance in series circuit in relay test circuit be connected with the input end of signal output apparatus with No. two, No. two isolation are connected with power supply and MCU with the output terminal of signal output apparatus, respectively for output relay state detection signal.
Described resistance in series circuit comprises three resistance be connected in series successively.Described resistance all adopts 68K ohm, 1206 packaged resistances.A described isolation comprises optocoupler and filtering circuit with signal output apparatus.Described No. two isolation comprise optocoupler and filtering circuit with signal output apparatus.Described optocoupler adopts paster optocoupler.Described filtering circuit adopts RC filtering circuit, and resistance wherein adopts resistance to be 100K ohm, 0603 packaged resistance, and electric capacity adopts capacitance to be 1
μthe patch capacitor of farad, 0603 encapsulation.
The utility model realizes the tripping operation to user side disconnecting link, the function detected of closing a floodgate by table meter end ball bearing made using, and circuit relates to safe and reliable.
Accompanying drawing explanation
Fig. 1 is the simple place in circuit figure of low voltage electric network user.
Fig. 2 is disconnecting link testing circuit figure of the present utility model.
Fig. 3 is relay test circuit diagram of the present utility model.
Fig. 4 is operating voltage of the present utility model and user side impedance variation curve map.
Embodiment
When the utility model uses that simple low cost device to solve in Fig. 1 when showing meter live wire relay K 1, zero line relay K 2 trips, judge the problem of the break-make of user side disconnecting link K3.
As shown in Figure 1, after electric energy meter installs, live wire relay K 1, zero line relay K 2 will be in "on" position, will obtain electric power supply when user side disconnecting link closes a floodgate.
In figure, UL, UN represent that live wire, neutral voltage input; UL_, UN_ represent relay output end; VCC is table meter power supply; K3 is user side disconnecting link; F is user side short circuit fuse; RL is user side load.
As shown in Figure 1, Figure 2 and Figure 3, the utility model comprises disconnecting link testing circuit and relay test circuit.The voltage input end of electric energy meter live wire relay is connected with the output terminal of this relay by resistance in series circuit in disconnecting link testing circuit; The voltage input end of zero line relay is connected with another resistance in series circuit of disconnecting link testing circuit, and the output terminal of zero line relay is isolated with in disconnecting link testing circuit No. and is connected with signal output apparatus.
The output terminal of electric energy meter live wire relay, the output terminal of zero line relay are connected with the two-way resistance in series circuit of relay test circuit respectively.The output terminal of relay test circuit is connected with MCU.
As shown in Figure 2, disconnecting link testing circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode D1 of high pressure, low-leakage current pipe D2 and No. one isolation and signal output apparatus.One tunnel resistance in series circuit comprises the resistance R1, resistance R2 and the resistance R3 that are connected in series successively.Another road resistance in series circuit comprises the resistance R4, resistance R5 and the resistance R6 that are connected in series successively.An isolation comprises an optocoupler N1 and RC filtering circuit with signal output apparatus.A RC filtering circuit comprises resistance R13 and electric capacity C1.
The voltage input end UN of electric energy meter zero line relay K 2 is connected with the output terminal UN_ of this relay K 2 with resistance R3 by resistance R1, the resistance R2 be connected in series successively.The voltage input end UL of electric energy meter live wire relay K 1 is connected with the negative electrode of the reverse withstand voltage diode D1 of high pressure with resistance R6 by resistance R4, the resistance R5 be connected in series successively, the anode of this diode D1 is connected with the negative electrode of optocoupler N1, the anode of optocoupler N1 is connected with the output terminal UL_ of this relay K 1, the collector of this optocoupler N1 is counted power supply VCC with table and is connected, its emitter-base bandgap grading is connected with MCU, for exporting user side breaker tripping and closing condition adjudgement signal USERCHECK.The negative electrode of low-leakage current pipe D2 is connected with the output terminal UL_ of live wire relay K 1, and its anode is connected with the anode of the reverse withstand voltage diode D1 of high pressure.Between the emitter-base bandgap grading that RC filtering circuit is connected to optocoupler N1 and ground.
As shown in Figure 3, relay test circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode D3 of high pressure, low-leakage current pipe D4 and No. two isolation and signal output apparatus.One tunnel resistance in series circuit comprises the resistance R7, resistance R8 and the resistance R9 that are connected in series successively.Another road resistance in series circuit comprises the resistance R10, resistance R11 and the resistance R12 that are connected in series successively.No. two isolation comprise optocoupler N2 and No. two RC filtering circuit with signal output apparatus.No. two RC filtering circuits comprise resistance R14 and electric capacity C2.
The output terminal UL_ of electric energy meter live wire relay K 1 is connected with the anode of optocoupler N2 with resistance R9 by resistance R7, the resistance R8 be connected in series successively.The output terminal UN_ of zero line relay K 2 is connected with the negative electrode of the reverse withstand voltage diode D3 of high pressure with resistance R12 by resistance R10, the resistance R11 be connected in series successively; The anode of this diode D3 is connected with the negative electrode of optocoupler N2.The collector of this optocoupler N2 is counted power supply VCC with table and is connected, and its emitter-base bandgap grading is connected with MCU, for output relay state detection signal RELAYCHECK.The negative electrode of low-leakage current pipe D2 is connected with the anode of optocoupler N2, and its anode is connected with the anode of the reverse withstand voltage diode D3 of high pressure.Between the emitter-base bandgap grading that No. two RC filtering circuits are connected to optocoupler N2 and ground.
By repetition test, circuit parameter selection is: resistance R1 is 68K, 1206 packaged resistances to resistance 12; Optocoupler N1, optocoupler N2 are paster optocoupler; Resistance R13, resistance R14 select 100K, 0603 packaged resistance; Electric capacity C1, electric capacity C2 are 1uF, 0603 patch capacitor.
Below in conjunction with specific experiment data to circuit of the present utility model explanation for further analysis.
(1) live wire relay K 1 and zero line relay K 2 trip, user side disconnecting link K3 trips.
Electrical network positive half-wave voltage flows through resistance R4-R5-R6 through the voltage input end UL of live wire relay K 1 to be ended by the reverse withstand voltage diode D1 of high pressure, and low-leakage current pipe D2 is used for protecting low oppositely withstand voltage optocoupler N1.
Electrical network is born half-wave voltage and is flowed through resistance R1-R2-R3-R10-R11-R12 through the voltage input end UN of zero line relay K 2 and ended by the reverse withstand voltage diode D3 of high pressure, and low-leakage current pipe D4 is used for protecting low oppositely withstand voltage optocoupler N2.
Now, user side breaker tripping and closing condition adjudgement signal USERCHECK, the equal output low level of relay status detection signal RELAYCHECK.
(2) live wire relay K 1 and zero line relay K 2 trip, user side disconnecting link K3 closes a floodgate.
Electrical network positive half-wave voltage flows through resistance R4-R5-R6 through the voltage input end UL of live wire relay K 1 to be ended by the reverse withstand voltage diode D1 of high pressure, and low-leakage current pipe D2 is used for protecting low oppositely withstand voltage optocoupler N1.
Electrical network is born half-wave voltage and is flowed to the elementary-D1-R6-R5-R4-UN of resistance R1-R2-R3-RL-optocoupler N1 through the voltage input end UN of zero line relay K 2, forms closed-loop path.
Now, user side breaker tripping and closing condition adjudgement signal USERCHECK exports high level, relay status detection signal RELAYCHECK output low level, can judge whether on this basis to drive relay to be customer power supply.
(3) live wire relay K 1 and the 2-in-1 lock of zero line relay K, user side disconnecting link K3 close a floodgate.
The now voltage input end UL of live wire relay K 1, the output terminal UL_ of live wire relay K 1; The voltage input end UN of zero line relay K 2, the output terminal UN_ of zero line relay K 2 are shorted together, and user side breaker tripping and closing condition adjudgement signal USERCHECK place testing circuit is shorted outside.Relay status detection signal RELAYCHECK place circuit enters duty.
Electrical network positive half-wave voltage flows to the output terminal UL_-R7-R8-R9-N2-D3-R12-10-R11-UN_ of live wire relay K 1 through the voltage input end UL of live wire relay K 1, forms closed-loop path.
Now, user side breaker tripping and closing condition adjudgement signal USERCHECK output low level, relay status detection signal RELAYCHECK export high level.When relay status detection signal RELAYCHECK exports high level, software is without the need to detecting user side breaker tripping and closing condition adjudgement signal USERCHECK state, and table meter is normally customer power supply.
(4) live wire relay K 1 and the 2-in-1 lock of zero line relay K, user side disconnecting link K3 trip.
Now table meter normal power supply, without the need to judging user side breaker tripping and closing condition adjudgement signal USERCHECK state.
(5) about the analysis of user side RL load short circuits state.
If a. live wire relay K 1 and zero line relay K 2 trip, user side disconnecting link K3 trips, now load RL short circuit, fuse F can not action.
If b. live wire relay K 1 and zero line relay K 2 trip, user side disconnecting link K3 closes a floodgate, now load RL short circuit, fuse F can not action.
If c. live wire relay K 1 and the 2-in-1 lock of zero line relay K, user side disconnecting link K3 trip, now load RL short circuit, fuse F can not action.
If d. live wire relay K 1 and the 2-in-1 lock of zero line relay K, user side disconnecting link K3 close a floodgate, now load RL short circuit, fuse F can fusing automatically.
By above analysis, the utility model achieves all functions that conventional circuit possesses, and achieves the detection to user side disconnecting link K3 breaker tripping and closing state simultaneously.
(6) circuit defect.
A. live wire relay K 1 and zero line relay K 2 disconnect, under user side disconnecting link K3 trip condition, live wire relay K 1 and zero line relay K 2 have 100V voltage between output terminal UL_, UN_, the electric current corresponding to this voltage should be less than 0.5mA for high reverse withstand voltage diode D1 reverse leakage current.
B. the table meter quiescent dissipation caused by above-mentioned (1) can exceed 0.1W.
If c. user side load RL is infinitely great, then user side breaker tripping and closing condition adjudgement signal USERCHECK circuit cannot detect the action of user side disconnecting link K3.
This kind of situation is specifically discussed in following (7).
(7) if when user side load RL is infinitely great, then user side breaker tripping and closing condition adjudgement signal USERCHECK circuit cannot detect user side disconnecting link K3 action, and table 1 is concrete test data of the present utility model.
As seen from Figure 4, along with the increase of user side load RL impedance, be Diamond spot curve in 100V(Fig. 4 in examination piezoelectric voltage) and 230V(Fig. 4 in square dot curve) in two kinds of situations, the voltage that user side breaker tripping and closing condition adjudgement signal USERCHECK can detect can be more and more less.The electric energy meter that the utility model is applied, system voltage is 5V, and minimum is 2.8V.According to Transistor-Transistor Logic level logic, ensure the accuracy that user side disconnecting link K3 breaker tripping and closing detect, the voltage that the utility model controls to detect must higher than 3V simultaneously.
When user side load RL is near 300K, user side breaker tripping and closing condition adjudgement signal USERCHECK change in voltage there is flex point and this knee voltage more than 3V, the utility model selects this flex point impedance to be a higher limit of user side load RL impedance.
When user side loaded impedance is greater than 300K, the utility model cannot detect that user side disconnecting link K3 trips or "on" position; When user side loaded impedance is less than 300K, the utility model can detect that user side disconnecting link K3 trips or "on" position.
Can obtain thus, the utility model can detect the user side minimum power consumption of user side disconnecting link K3 action: 230 × 230/300K=0.176(watt), namely, when user side is connected to the load being at least greater than 0.176W, the utility model can detect the action of user side disconnecting link K3.
Table 1:
The utility model by judging that the impedance variation produced in the tripping operation of user side disconnecting link, making process judges the function of the operating state of user side disconnecting link, and improves the safety and reliability of circuit.
Claims (7)
1. an electric energy meter user end disconnecting link folding testing circuit, it is characterized in that, comprise disconnecting link testing circuit and relay test circuit, disconnecting link testing circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode of high pressure, low-leakage current pipe and an isolation and signal output apparatus, and relay test circuit comprises two-way resistance in series circuit, the reverse withstand voltage diode of high pressure, low-leakage current pipe and No. two isolation and signal output apparatus;
The voltage input end of electric energy meter zero line relay is connected with the output terminal of this relay by series resistance circuit in disconnecting link testing circuit; The voltage input end of electric energy meter live wire relay is connected with the negative electrode of the reverse withstand voltage diode of high pressure by another resistance in series circuit in disconnecting link testing circuit, the anode of this is withstand voltage diode is connected with the output terminal of this relay with the input end of signal output apparatus via an isolation, the output terminal of this relay is also connected with the anode of low-leakage current pipe, and the negative electrode of low-leakage current pipe is connected with the negative electrode of the reverse withstand voltage diode of disconnecting link testing circuit mesohigh; An isolation is connected with power supply and MCU respectively with the output terminal of signal output apparatus, for exporting user side breaker tripping and closing condition adjudgement signal;
The output terminal of live wire relay is isolated by series resistance circuit in relay test circuit be connected with the input end of signal output apparatus with No. two, the output terminal of zero line relay is isolated by another resistance in series circuit in relay test circuit be connected with the input end of signal output apparatus with No. two, No. two isolation are connected with power supply and MCU with the output terminal of signal output apparatus, respectively for output relay state detection signal.
2. electric energy meter user end disconnecting link folding testing circuit according to claim 1, it is characterized in that, described resistance in series circuit comprises three resistance be connected in series successively.
3. electric energy meter user end disconnecting link folding testing circuit according to claim 2, it is characterized in that, described resistance all adopts 68K ohm, 1206 packaged resistances.
4. electric energy meter user end disconnecting link folding testing circuit according to claim 1, is characterized in that, a described isolation comprises optocoupler and filtering circuit with signal output apparatus.
5. electric energy meter user end disconnecting link folding testing circuit according to claim 1, is characterized in that, described No. two isolation comprise optocoupler and filtering circuit with signal output apparatus.
6. the electric energy meter user end disconnecting link folding testing circuit according to claim 4 or 5, is characterized in that, described optocoupler adopts paster optocoupler.
7. the electric energy meter user end disconnecting link folding testing circuit according to claim 4 or 5, it is characterized in that, described filtering circuit adopts RC filtering circuit, and resistance wherein adopts resistance to be 100K ohm, 0603 packaged resistance, and electric capacity adopts capacitance to be 1 μ farad, 0603 patch capacitor encapsulated.
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| CN201520077587.6U CN204374385U (en) | 2015-02-04 | 2015-02-04 | Electric energy meter user end disconnecting link folding testing circuit |
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| CN201520077587.6U CN204374385U (en) | 2015-02-04 | 2015-02-04 | Electric energy meter user end disconnecting link folding testing circuit |
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Cited By (5)
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| CN106501716A (en) * | 2016-12-19 | 2017-03-15 | 宁波三星医疗电气股份有限公司 | The single-phase electric meter air switch signal deteching circuit that is sampled based on resistance terminal and method |
| CN106526475A (en) * | 2016-12-19 | 2017-03-22 | 宁波三星医疗电气股份有限公司 | Three-phase electric energy meter air-switch signal detection circuit and method based on photoelectric coupler |
| CN108535639A (en) * | 2018-03-27 | 2018-09-14 | 江苏卡欧万泓电子有限公司 | A kind of method of automatic detection intelligent electric meter relay switching on |
| CN110187267A (en) * | 2019-06-06 | 2019-08-30 | 杭州海兴电力科技股份有限公司 | Single-phase three-wire intelligent electric meter relay status detection circuit and method |
| CN111722101A (en) * | 2020-05-29 | 2020-09-29 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
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2015
- 2015-02-04 CN CN201520077587.6U patent/CN204374385U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106501716A (en) * | 2016-12-19 | 2017-03-15 | 宁波三星医疗电气股份有限公司 | The single-phase electric meter air switch signal deteching circuit that is sampled based on resistance terminal and method |
| CN106526475A (en) * | 2016-12-19 | 2017-03-22 | 宁波三星医疗电气股份有限公司 | Three-phase electric energy meter air-switch signal detection circuit and method based on photoelectric coupler |
| CN106501716B (en) * | 2016-12-19 | 2020-08-18 | 宁波三星医疗电气股份有限公司 | Single-phase electric meter open signal detection circuit and method based on resistance end sampling |
| CN108535639A (en) * | 2018-03-27 | 2018-09-14 | 江苏卡欧万泓电子有限公司 | A kind of method of automatic detection intelligent electric meter relay switching on |
| CN110187267A (en) * | 2019-06-06 | 2019-08-30 | 杭州海兴电力科技股份有限公司 | Single-phase three-wire intelligent electric meter relay status detection circuit and method |
| CN110187267B (en) * | 2019-06-06 | 2021-08-13 | 杭州海兴电力科技股份有限公司 | Single-phase three-wire intelligent ammeter relay state detection circuit and method |
| CN111722101A (en) * | 2020-05-29 | 2020-09-29 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
| CN111722101B (en) * | 2020-05-29 | 2023-09-01 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
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