CN109001622B - Detection method for external load switch of electric energy meter - Google Patents
Detection method for external load switch of electric energy meter Download PDFInfo
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- CN109001622B CN109001622B CN201810864828.XA CN201810864828A CN109001622B CN 109001622 B CN109001622 B CN 109001622B CN 201810864828 A CN201810864828 A CN 201810864828A CN 109001622 B CN109001622 B CN 109001622B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A detection method of an external load switch of an electric energy meter comprises the steps that (1) a control line and a feedback line of the external load switch are correspondingly connected with a tripping control terminal and a feedback terminal of the electric energy meter; step (2), the tripping control terminal outputs a control signal, and the output end of the external load switch correspondingly outputs feedback voltage; step (3), the feedback voltage outputs a corresponding feedback level through a feedback signal detection circuit; step (4), detecting a feedback signal according to the feedback level, and judging the state of the external load switch detected by the feedback voltage according to the feedback signal; step (5), when the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch are both in an off state, the actual state of the external load switch is off, otherwise, the external load switch is on; and (6) if the command signal of the external load switch is not consistent with the actual state, performing exception processing on the external load switch. The detection method has higher accuracy and is more reasonable and reliable.
Description
Technical Field
The invention relates to the field of electric energy meters, in particular to a detection method of an external load switch of an electric energy meter.
Background
The intelligent electric energy meter has the functions of remote meter reading, power failure and restoration and the like. At present, the external load switch is triggered by pulling a switching contact of an intelligent electric energy meter in China, so that the load current of a user is quickly and reliably switched off and on, and the power failure and restoration are implemented.
When a power supply company wants to power off a certain user due to arrearage or other reasons, a switching-off command can be sent to the intelligent electric energy meter through a marketing service system, an electricity consumption information acquisition system or a field palm machine; after the user pays the arrears clearly or meets the power transmission condition, the power supply company can send a closing command to the intelligent electric energy meter through a marketing service system, a power utilization information acquisition system or a field palm machine.
The switching command may not be successful due to line faults, aging of load switches, etc. How to ensure accurate and reliable power failure and recovery and avoid power consumption disputes is a problem faced by current power supply companies and electric energy meter enterprises. For the detection of whether the external load switch is successfully switched on or off, the current method mainly adopts a mode of detecting an electric load, namely, after a switching-off or switching-on command is sent out, whether the switching-off or switching-on is successful is fed back by detecting the power consumption or the current consumption of a user. However, the method has the problem of misjudgment: 1. after the power supply company sends the switching-off command, the actual intelligent electric energy meter is not successfully switched off, but the user does not use electricity during detection, so that the power supply company is judged to be successfully switched off by mistake; 2. and the power supply company sends a switching-on command, the actual intelligent electric energy meter is switched on successfully, but the user does not use electricity during detection, so that the switching-on is judged to be unsuccessful. Further improvements are therefore desirable.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for detecting an external load switch of an electric energy meter, which has accurate and reliable detection results, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a detection method for an external load switch of an electric energy meter is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps that (1) a control line and a feedback line of an external load switch are respectively and correspondingly connected with a tripping control terminal and a feedback terminal of the electric energy meter;
step (2), a tripping control terminal of the electric energy meter outputs a control signal to enable an external load switch to be switched on or off, and the output end of the external load switch correspondingly outputs feedback voltage;
step (3), outputting the feedback voltage in the step (2) to a corresponding feedback level through a feedback signal detection circuit, wherein the output end of the feedback signal detection circuit is connected with the MCU;
step (4), the MCU detects a feedback signal according to the feedback level and judges the state of a feedback voltage detection external load switch according to the feedback signal;
step (5), judging the actual state of the external load switch according to the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch, wherein when the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch are both in an off state, the actual state of the external load switch is off, otherwise, the actual state of the external load switch is on;
and (6) judging whether the command signal of the external load switch is consistent with the actual state of the external load switch, if so, exiting, otherwise, performing exception processing on the external load switch.
Specifically, the control signal in the step (2) adopts an alternating current 220V level mode or a half-wave rectification mode.
Furthermore, in order to prevent a human body from getting an electric shock and protect the short circuit of the electric energy meter, a fifth resistor R5 is connected in series with the input end of the electric energy meter in the step (2), and the other end of the fifth resistor R5 outputs a control signal.
Preferably, the feedback signal detection circuit in step (3) includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, and a transistor V1, wherein one end of the first resistor R1 is an input end of the feedback signal detection circuit, the other end of the first resistor R1 is connected to the anode of the diode D1, the cathode of the diode D1 is respectively connected to the bases of the second resistor R2 and the transistor V1, the other end of the second resistor R2 is connected to the emitter of the transistor V1, and is grounded, the collector of the transistor V1 is respectively connected to one ends of the third resistor R3 and the fourth resistor R4, the other end of the third resistor R3 is connected to the first voltage VCC, and the other end of the fourth resistor R4 is an output end of the feedback signal detection circuit.
Preferably, the transistor V1 is an NPN transistor.
Specifically, the specific steps in the step (4) are as follows:
step (4-1), the MCU detects the feedback level at regular time, and the timing time is t/ms;
step (4-2), judging whether the MCU detects a feedback state, if so, turning to step (4-5), otherwise, turning to step (4-3);
step (4-3), judging whether the detected feedback level is a low level, if so, adding 1 to the number of times of the low level, turning to step (4-4), otherwise, resetting the number of times of the low level, and turning to step (4-5) if the MCU does not detect a feedback signal;
step (4-4), judging whether the low level times are greater than N, if so, judging that the MCU detects a feedback signal and the detection state of the feedback signal is detected; otherwise, the MCU does not detect a feedback signal; wherein N is a positive integer;
step (4-5), when the detection interval is greater than the cycle time T/ms, the step (4-6) is carried out, otherwise, the operation is finished;
step (4-6), judging whether feedback signals are detected in M continuous periods, if so, judging that the state of the feedback voltage detection external load switch is a closed state, otherwise, judging that the state of the feedback voltage detection external load switch is an open state; wherein M is a positive integer;
and (4-7) setting the feedback signal detection state as undetected, and ending.
Preferably, the value range of the timing time t is 1-3.
Preferably, the value range of the period time T is 20-30.
Preferably, the value range of N of the low level times is 3-6; the value range of the continuous times M of the feedback signal is 3-6.
In this embodiment, specifically, the step (5) includes the following steps:
step (5-1), sending a switching-on/off command to the electric energy meter;
step (5-2), judging whether the total power of the electric energy meter is larger than the starting power, if so, determining that the actual state of the external load switch is a closed state, otherwise, determining that the actual state of the external load switch is an open state;
step (5-3), judging whether the state of the external load switch detected by the feedback voltage is a closed state, if so, detecting that the actual state of the external load switch detected by the feedback voltage is the closed state, otherwise, detecting that the actual state of the external load switch detected by the feedback voltage is an open state;
and (5-4) judging whether the actual state of the external load switch is off or not when the actual state of the external load switch is in the power detection state and the actual state of the external load switch is in the feedback voltage detection state, and otherwise, judging that the actual state of the external load switch is on.
Compared with the prior art, the invention has the advantages that: the method has the advantages that the problem of misjudgment of the actual state of the external load switch by a user without electricity in the prior art is solved by double-condition judgment of the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch, the feedback voltage of the external load switch outputs a feedback level through the feedback signal detection circuit, whether a feedback signal exists or not is judged according to the feedback level, the accuracy rate of the feedback voltage detection external load switch on the actual state is higher, and the detection method is more reasonable.
Drawings
FIG. 1 is a flowchart of a method for detecting an external switch according to an embodiment of the present invention;
FIG. 2 is a flow chart of the feedback voltage detection external load switch state of FIG. 1;
fig. 3 is a circuit diagram of a feedback signal detection circuit according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, a method for detecting an external load switch of an electric energy meter includes the following steps:
the method comprises the following steps that (1) a control line and a feedback line of an external load switch are respectively and correspondingly connected with a tripping control terminal and a feedback terminal of the electric energy meter;
step (2), a tripping control terminal of the electric energy meter outputs a control signal to enable an external load switch to be switched on or off, and the output end of the external load switch correspondingly outputs feedback voltage;
the control signal of the electric energy meter adopts an alternating current 220V level mode or a half-wave rectification mode, a fifth resistor R5 is connected in series with the input end of the electric energy meter, and the other end of the fifth resistor R5 outputs the control signal, wherein in the embodiment, the fifth resistor R5 is 100K Ω;
within the normal working voltage range of the electric energy meter, if the control signal adopts a half-wave rectification mode, the average value of the output voltage of the signal in the non-excited state is not lower than 60V, the peak voltage of the positive direction is not lower than 180V, and the average value of the output voltage of the excited state is less than 36V. If the control signal adopts an AC220V level mode, the output voltage of the signal in the non-excited state is 60 to 120 percent of the power supply voltage of the electric energy meter, and the output voltage in the excited state is 0 to 25 percent of the power supply voltage.
When the control signal is in a non-excitation state, the external load switch is closed to allow a user to use electricity; when the control signal is in an excitation state, the external load switch is switched off, and the power supply of a user is interrupted.
Step (3), outputting the feedback voltage in the step (2) to a corresponding feedback level through a feedback signal detection circuit, wherein the output end of the feedback signal detection circuit is connected with the MCU;
as shown in fig. 3, the feedback signal detection circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, and a transistor V1, one end of the first resistor R1 is an INPUT terminal INPUT of the feedback signal detection circuit, the other end of the first resistor R1 is connected to an anode of the diode D1, a cathode of the diode D1 is respectively connected to a base of the second resistor R2 and a base of the transistor V1, the other end of the second resistor R2 is connected to an emitter of the transistor V1, and is grounded, a collector of the transistor V1 is respectively connected to one ends of the third resistor R3 and the fourth resistor R4, the other end of the third resistor R3 is connected to a first voltage VCC, and the other end of the fourth resistor R4 is an OUTPUT terminal OUTPUT of the feedback signal detection circuit. In this embodiment, the transistor V1 is an NPN transistor. The INPUT end INPUT of the feedback signal detection circuit is feedback voltage, the OUTPUT end OUTPUT of the feedback signal detection circuit is feedback level, the feedback voltage OUTPUT when the external load switch is switched on or switched off is converted into low level or high level through the feedback signal detection circuit, the result of judging the feedback signal is quantized by detecting the high level and the low level of the feedback level, the feedback signal is judged more conveniently, and the accuracy is high.
Step (4), the MCU detects a feedback signal according to the feedback level and judges the state of a feedback voltage detection external load switch according to the feedback signal;
as shown in fig. 2, the method specifically comprises the following steps:
step (4-1), the MCU detects the feedback level at regular time, and the timing time is t/ms;
step (4-2), judging whether the MCU detects a feedback state, if so, turning to step (4-5), otherwise, turning to step (4-3);
step (4-3), judging whether the detected feedback level is a low level, if so, adding 1 to the number of times of the low level, turning to step (4-4), otherwise, resetting the number of times of the low level, and turning to step (4-5) if the MCU does not detect a feedback signal;
step (4-4), judging whether the low level times are greater than N, if so, judging that the MCU detects a feedback signal and the detection state of the feedback signal is detected; otherwise, the MCU does not detect a feedback signal; wherein N is a positive integer;
step (4-5), when the detection interval is greater than the cycle time T/ms, the step (4-6) is carried out, otherwise, the operation is finished;
step (4-6), judging whether feedback signals are detected in M continuous periods, if so, judging that the state of the feedback voltage detection external load switch is a closed state, otherwise, judging that the state of the feedback voltage detection external load switch is an open state; wherein M is a positive integer;
and (4-7) setting the feedback signal detection state as undetected, and ending.
The value range of the timing time t is 1-3; the value range of the period time T is 20-30; the value range of N of the low level times is 3-6; the value range of the continuous times M of the feedback signal is 3-6; in the present embodiment, the timing time t is 1; the period time T is 25; the low level times N is 4, and the feedback signal continuous times M is 5.
Step (5), judging the actual state of the external load switch according to the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch;
the method comprises the following specific steps:
step (5-1), sending a switching-on/off command to the electric energy meter;
step (5-2), judging whether the total power of the electric energy meter is larger than the starting power, if so, determining that the actual state of the external load switch is a closed state, otherwise, determining that the actual state of the external load switch is an open state;
step (5-3), judging whether the state of the external load switch detected by the feedback voltage is a closed state, if so, detecting that the actual state of the external load switch detected by the feedback voltage is the closed state, otherwise, detecting that the actual state of the external load switch detected by the feedback voltage is an open state;
and (5-4) judging whether the actual state of the external load switch is off or not when the actual state of the external load switch is in the power detection state and the actual state of the external load switch is in the feedback voltage detection state, and otherwise, judging that the actual state of the external load switch is on.
And (6) judging whether the command signal of the external load switch is consistent with the actual state of the external load switch, if so, exiting, otherwise, performing exception handling on the external load switch.
In the prior art, if the feedback signal adopts a half-wave rectification mode: when the average value of the signal output voltage is higher than 60V and the positive peak voltage is higher than 180V, the electric energy meter is identified to be in a non-excitation state, and the state of the external load switch which is identified at the moment is in a closing state; the positive peak voltage of the signal is lower than 10V, the electric energy meter is identified as an excitation state, and the identified state of the external load switch is a switching-off state; if the feedback signal takes the AC220V level mode: the effective value of the signal output voltage is higher than 130V, the electric energy meter is identified as a non-excitation state, and the state of the external load switch which is identified at the moment is a closing state; the effective value of the signal output voltage is lower than 5V, the electric energy meter is identified as an excitation state, and the identified state of the external load switch is a switching-off state. Therefore, the accuracy is high through the feedback voltage judgment, and the single power detection has the condition of misjudgment.
When the following occurs:
1. after the power supply company sends the switching-off command, the actual intelligent electric energy meter is not successfully switched off, but the user does not use electricity during detection, so that the power supply company is judged to be successfully switched off by mistake;
when the power supply company sends out a switching-off command and the actual intelligent electric energy meter is not successfully switched off, the feedback voltage detects that the actual state of the external load switch is a closed state, when a user does not use power during detection, the power detects that the actual state of the external load switch is off, and the actual state of the external load switch is judged to be closed according to the method; and if the actual state of the external load switch is judged to be unsuccessful switching-off and the actual state of the external load switch is inconsistent with the command signal command of the external load switch, exception handling is carried out, and the problem of misjudgment is solved.
2. The power supply company sends a switching-on command, the actual intelligent electric energy meter is switched on successfully, but the user does not use electricity during detection, so that the situation that the switching-on is not successful is judged by mistake;
when the power supply company sends a closing command and the actual intelligent electric energy meter is successfully closed, the feedback voltage detects that the actual state of the external load switch is a closed state, and when a user does not use power during detection, the power detects that the actual state of the external load switch is off, and the actual state of the external load switch is closed according to the method; the actual state of the external load switch is judged to be the switch-on state, and the actual state of the external load switch is consistent with the command signal command of the external load switch, so that the problem of misjudgment is solved.
When the method is used for detecting the external load switch of the electric energy meter, the problem of misjudgment of the actual state of the external load switch by a user without electricity during switching off or switching on in the prior art is solved through double-condition judgment of detecting the actual state of the external load switch by using the power detection external load switch and the feedback voltage, the judgment accuracy is improved, in the detection of the actual state of the feedback voltage detection external load switch, the feedback voltage outputs a feedback level through the feedback signal detection circuit, the feedback signal is judged, and the actual state of the feedback voltage detection external load switch is judged to be a closed state through detecting the feedback signal in a plurality of continuous periods, so that the method is more reasonable, and the result is more accurate and reliable.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A detection method for an external load switch of an electric energy meter is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps that (1) a control line and a feedback line of an external load switch are respectively and correspondingly connected with a tripping control terminal and a feedback terminal of the electric energy meter;
step (2), a tripping control terminal of the electric energy meter outputs a control signal to enable an external load switch to be switched on or off, and the output end of the external load switch correspondingly outputs feedback voltage;
step (3), outputting the feedback voltage in the step (2) to a corresponding feedback level through a feedback signal detection circuit, wherein the output end of the feedback signal detection circuit is connected with the MCU;
step (4), the MCU detects a feedback signal according to the feedback level and judges the state of a feedback voltage detection external load switch according to the feedback signal;
the method comprises the following specific steps:
step (4-1), the MCU detects the feedback level at regular time, and the timing time is t/ms;
step (4-2), judging whether the feedback state detected by the MCU is detected, if so, turning to step (4-5), otherwise, turning to step (4-3);
step (4-3), judging whether the detected feedback level is a low level, if so, adding 1 to the number of times of the low level, turning to step (4-4), otherwise, resetting the number of times of the low level, and turning to step (4-5) if the MCU does not detect a feedback signal;
step (4-4), judging whether the number of times of the low level is greater than N, if so, judging that the MCU detects a feedback signal and the feedback state is detected, and turning to the step (4-5); otherwise, the MCU does not detect the feedback signal and the step (4-5) is carried out; wherein N is a positive integer;
step (4-5), when the detection interval is greater than the cycle time T/ms, the step (4-6) is carried out, otherwise, the operation is finished;
step (4-6), judging whether feedback signals are detected in M continuous periods, if so, judging that the state of the external load switch detected by the feedback voltage is a closed state, and turning to step (4-7); otherwise, judging that the state of the feedback voltage detection external load switch is a disconnected state, and turning to the step (4-7); wherein M is a positive integer;
step (4-7), setting the feedback state as undetected, and ending;
step (5), judging the actual state of the external load switch according to the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch, wherein when the actual state of the power detection external load switch and the actual state of the feedback voltage detection external load switch are both in an off state, the actual state of the external load switch is off, otherwise, the actual state of the external load switch is on;
and (6) judging whether the command signal of the external load switch is consistent with the actual state of the external load switch, if so, exiting, otherwise, performing exception processing on the external load switch.
2. The method for detecting the external load switch of the electric energy meter according to claim 1, characterized in that: and (3) the control signal in the step (2) adopts an alternating current 220V level mode or a half-wave rectification mode.
3. The detection method of the external load switch of the electric energy meter according to claim 1 or 2, characterized in that: and (3) the input end of the electric energy meter in the step (2) is connected with a fifth resistor R5 in series, and the other end of the fifth resistor R5 outputs a control signal.
4. The method for detecting the external load switch of the electric energy meter according to claim 1, characterized in that: the feedback signal detection circuit in the step (3) includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1 and a triode V1, wherein one end of the first resistor R1 is an input end of the feedback signal detection circuit, the other end of the first resistor R1 is connected with an anode of the diode D1, a cathode of the diode D1 is respectively connected with bases of the second resistor R2 and the triode V1, the other end of the second resistor R2 is connected with an emitter of the triode V1 and grounded, a collector of the triode V1 is respectively connected with one ends of the third resistor R3 and the fourth resistor R4, the other end of the third resistor R3 is connected with a first voltage VCC, and the other end of the fourth resistor R4 is an output end of the feedback signal detection circuit.
5. The method for detecting the external load switch of the electric energy meter according to claim 4, characterized in that: the triode V1 is an NPN triode.
6. The method for detecting the external load switch of the electric energy meter according to claim 1, characterized in that: the value range of the timing time t is 1-3.
7. The method for detecting the external load switch of the electric energy meter according to claim 1, characterized in that: the value range of the period time T is 20-30.
8. The method for detecting the external load switch of the electric energy meter according to claim 1, characterized in that: the value range of N of the low level times is 3-6; the value range of the continuous times M of the feedback signal is 3-6.
9. The method for detecting the external load switch of the electric energy meter according to claim 1, characterized in that: the specific steps in the step (5) are as follows:
step (5-1), sending a switching-on/off command to the electric energy meter;
step (5-2), judging whether the total power of the electric energy meter is larger than the starting power, if so, determining that the actual state of the external load switch is a closed state, otherwise, determining that the actual state of the external load switch is an open state;
step (5-3), judging whether the state of the external load switch detected by the feedback voltage is a closed state, if so, detecting that the actual state of the external load switch detected by the feedback voltage is the closed state, otherwise, detecting that the actual state of the external load switch detected by the feedback voltage is an open state;
and (5-4) judging whether the actual state of the external load switch is off or not when the actual state of the external load switch is in the power detection state and the actual state of the external load switch is in the feedback voltage detection state, and otherwise, judging that the actual state of the external load switch is on.
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| CN111555292A (en) * | 2020-06-02 | 2020-08-18 | 国网江苏省电力有限公司苏州供电分公司 | Automatic line load adjusting device |
| CN111703471A (en) * | 2020-06-30 | 2020-09-25 | 湖南中车时代通信信号有限公司 | Railway product preventive maintenance device and method |
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| CN106093759A (en) * | 2016-05-31 | 2016-11-09 | 国网河北省电力公司电力科学研究院 | Method for detecting driving capability of external load switch for electric energy meter |
| CN106057599A (en) * | 2016-06-29 | 2016-10-26 | 乐清市万联电器有限公司 | Operating mechanism of cost control circuit breaker and control circuit thereof |
| CN206541001U (en) * | 2017-03-03 | 2017-10-03 | 广州供电局有限公司 | Take the testing agency of the control external breaker of electric energy meter |
| CN207232337U (en) * | 2017-09-30 | 2018-04-13 | 华立科技股份有限公司 | Relay on-off state detection circuit and electric energy meter |
| CN207636720U (en) * | 2017-12-04 | 2018-07-20 | 广西电网有限责任公司来宾供电局 | A kind of device for taking control electric energy meter breaker control functional test |
| CN207541476U (en) * | 2017-12-21 | 2018-06-26 | 浙江天正电气股份有限公司 | One kind carries the external circuit breaker control circuit of combined floodgate detection function electric energy meter |
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