CN109001622A - A kind of detection method of the external on-load switch of electric energy meter - Google Patents
A kind of detection method of the external on-load switch of electric energy meter Download PDFInfo
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- CN109001622A CN109001622A CN201810864828.XA CN201810864828A CN109001622A CN 109001622 A CN109001622 A CN 109001622A CN 201810864828 A CN201810864828 A CN 201810864828A CN 109001622 A CN109001622 A CN 109001622A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
A kind of detection method of the external on-load switch of electric energy meter, step (1), the control line of external on-load switch and feedback line are correspondingly connected with the tripping control terminal and feedback terminal of electric energy meter；Step (2), tripping control terminal output control signal, the corresponding output feedback voltage of external on-load switch output end；Step (3), feedback voltage export corresponding feedback level by feedback signal detection circuit；Step (4) detects feedback signal according to feedback level, and judges that feedback voltage detects the state of external on-load switch based on the feedback signal；Step (5), when the virtual condition that the virtual condition of the external on-load switch of power detection and feedback voltage detect external on-load switch is off-state, the virtual condition of external on-load switch is to disconnect, conversely, closure；Step (6), the command signal of external on-load switch and virtual condition are inconsistent, then do abnormality processing to external on-load switch.The accuracy rate of detection method is higher, and detection method is more rationally, reliably.
Description
Technical field
The present invention relates to electric energy meter field, in particular to the detection method of a kind of external on-load switch of electric energy meter.
Background technique
Intelligent electric energy meter have the function of remote meter reading, stop telegram in reply etc..Domestic at present is usually to use intelligent electric energy meter switching on
External on-load switch is triggered in contact, accomplishes to be switched off and on customer charge electric current fast and reliablely, and implementation stops sending a telegram in reply.
When power supply company is intended to implement to have a power failure to certain user because of arrearage or other reasons, can by sales service system,
Order of operating a switch is sent out to intelligent electric energy meter with palm machine in power information acquisition system, or scene；Arrearage is paid up to user or meets power transmission
After condition, power supply company can use palm machine to intelligent electric energy meter by sales service system, power information acquisition system, or scene
Hair, which closes a floodgate, orders.
Since all to may cause switching on order unsuccessful for line fault, aging of on-load switch etc..How to ensure to stop multiple
Electric accurate and reliable, avoiding electricity consumption dispute is current power supply company and electric energy meter enterprise problems faced.For external on-load switch
The detection whether being successfully switched off and on operates a switch or closes a floodgate distributing presently mainly by way of detecting power load
After order, whether successfully operates a switch or close a floodgate to feed back by the electric power or electricity consumption electric current of detection user.But this method exists
The problem of erroneous judgement: 1, power supply company distributes order of operating a switch, and practical intelligent electric energy meter is operated a switch not successfully, but user is unused when detection
Electricity causes to be mistaken for successfully to operate a switch；2, power supply company distributes combined floodgate order, and practical intelligent electric energy meter successfully closes a floodgate, but when detection
The non-electricity consumption of user causes to be mistaken for close a floodgate not successfully.Therefore it requires further improvement.
Summary of the invention
The technical problem to be solved by the invention for the present situation of prior art is to provide a kind of testing results accurately, can
The detection method of the external on-load switch of the electric energy meter leaned on.
The technical scheme of the invention to solve the technical problem is: a kind of detection of the external on-load switch of electric energy meter
Method, it is characterised in that: the following steps are included:
Step (1), the tripping control terminal that the control line of external on-load switch and feedback line are connected respectively to electric energy meter
Son and feedback terminal；
The tripping control terminal output control signal of step (2), electric energy meter, makes external on-load switch closing or opening, outside
Set the corresponding output feedback voltage of on-load switch output end；
Feedback voltage in step (2) is exported corresponding feedback level by feedback signal detection circuit by step (3),
The output end of feedback signal detection circuit is connect with MCU；
Step (4), MCU detect feedback signal according to feedback level, and judge that feedback voltage detection is outer based on the feedback signal
Set the state of on-load switch；
Step (5) detects external on-load switch according to the virtual condition and feedback voltage of the external on-load switch of power detection
Virtual condition judge the virtual condition of external on-load switch, when the virtual condition and feedback electricity of the external on-load switch of power detection
When the virtual condition that pressure detects external on-load switch is off-state, then the virtual condition of external on-load switch is to disconnect, instead
It, then the virtual condition of external on-load switch is closure；
Whether step (6), the command signal for judging external on-load switch are consistent with the virtual condition of external on-load switch, such as
Unanimously, then it exits, conversely, then doing abnormality processing to external on-load switch.
Specifically, the control signal in the step (2) uses alternating current 220V level mode or halfwave rectifier mode.
Further, human electric shock in order to prevent, the electric energy meter input to electric energy meter short-circuit protection, in the step (2)
End is in series with the 5th resistance R5, the 5th resistance R5 other end output control signal.
Preferably, the feedback signal detection circuit in the step (3) includes first resistor R1, second resistance R2,
Three resistance R3, the 4th resistance R4, diode D1 and triode V1, one end of the first resistor R1 are feedback signal detection circuit
Input terminal, the anode of first resistor R1 other end connection diode D1, the cathode of the diode D1 is separately connected the
The base stage of two resistance R2 and triode V1, the emitter of the other end connection triode V1 of the second resistance R2, and be grounded, institute
The collector for stating triode V1 is separately connected one end of 3rd resistor R3 and the 4th resistance R4, the other end of the 3rd resistor R3
First voltage VCC is connected, the other end of the 4th resistance R4 is the output end of feedback signal detection circuit.
Preferably, the triode V1 is NPN triode.
Specifically, the specific steps in the step (4) are as follows:
Step (4-1), MCU timing detection feedback level, timing t/ms；
Step (4-2) judges whether MCU detects feedback states, if so, step (4-5) is then transferred to, conversely, being then transferred to
Step (4-3)；
Whether the feedback level that step (4-3), judgement detect is low level, if so, then low level number adds 1, is turned
Enter step (4-4), conversely, then low level number is reset, and feedback signal is not detected in MCU, is transferred to step (4-5)；
Step (4-4) judges whether low level number is greater than N, if so, then determining that MCU detects feedback signal, and anti-
Feedback signal detecting state is to have detected；Conversely, then feedback signal is not detected in MCU；Wherein, N is positive integer；
Step (4-5), when detection interval be greater than cycle time T/ms when, then step (4-6) is transferred to, conversely, then terminating；
Step (4-6) judges whether to have detected feedback signal in the continuous N period, then decision-feedback voltage detecting
The state of external on-load switch is closed state, conversely, then the state of the external on-load switch of decision-feedback voltage detecting is to disconnect
State；Wherein, M is positive integer；
Step (4-7), feedback signal detecting state are set to and do not detect, terminate.
Preferably, the value range of the timing t is 1~3.
Preferably, the value range of the cycle time T is 20~30.
Preferably, the value range of the N of the low level number is 3~6；The feedback signal read-around ratio M's takes
Being worth range is 3~6.
In the present solution, specifically, specific steps in the step (5) are as follows:
Step (5-1) sends switching on order to electric energy meter；
Step (5-2) judges whether the general power of electric energy meter is greater than startup power, if so, the then external load of power detection
The virtual condition of switch is closed state, conversely, then the virtual condition of the external on-load switch of power detection is off-state；
Whether step (5-3), the state for judging that feedback voltage detects external on-load switch are closed state, if so, then anti-
The virtual condition that feedthrough voltage detects external on-load switch is closed state, conversely, then feedback voltage detects external on-load switch
Virtual condition is off-state；
Step (5-4), the virtual condition for judging the external on-load switch of power detection and feedback voltage detect external load and open
When the virtual condition of pass is off-state, then the virtual condition of external on-load switch is to disconnect, conversely, then external on-load switch
Virtual condition be closure.
Compared with the prior art, the advantages of the present invention are as follows: pass through the virtual condition to the external on-load switch of power detection
Double conditions judgement that the virtual condition of external on-load switch is detected with feedback voltage, solves the non-electricity consumption pair of user in the prior art
The erroneous judgement of the virtual condition of external on-load switch, and the feedback voltage of external on-load switch is defeated by feedback signal detection circuit
Feedback level out determines whether there is feedback signal according to feedback level, and feedback voltage is made to detect the practical shape of external on-load switch
State accuracy rate is higher, and detection method is more reasonable.
Detailed description of the invention
Fig. 1 is the detection method flow chart of the external switch of the embodiment of the present invention；
Fig. 2 is that the feedback voltage of Fig. 1 detects the flow chart of external on-load switch state；
Fig. 3 is the feedback signal detection circuit figure in the embodiment of the present invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As shown in Figure 1, a kind of detection method of the external on-load switch of electric energy meter, comprising the following steps:
Step (1), the tripping control terminal that the control line of external on-load switch and feedback line are connected respectively to electric energy meter
Son and feedback terminal；
The tripping control terminal output control signal of step (2), electric energy meter, makes external on-load switch closing or opening, outside
Set the corresponding output feedback voltage of on-load switch output end；
Wherein, electric energy meter control signal uses alternating current 220V level mode or halfwave rectifier mode, electric energy meter input terminal string
It is associated with the 5th resistance R5, the 5th resistance R5 other end, which exports, controls signal, in the present embodiment, the 5th resistance R5=100K Ω；
Within the scope of electric energy meter normal working voltage, if control signal takes halfwave rectifier mode, the non-actuated state of signal
Output voltage average value is not less than 60V, and peak forward voltage is not less than 180V, and excited state output voltage average value is less than 36V.If
Control signal and use AC220V level mode, the non-actuated state output voltage of signal should be the 60% of electric energy meter supply voltage to
120%, excited state output voltage should be the 0% to 25% of supply voltage.
When control signal is in non-actuated state, external on-load switch closure allows user power utilization；When control signal is in
When excited state, external on-load switch is disconnected, and interrupts customer power supply.
Feedback voltage in step (2) is exported corresponding feedback level by feedback signal detection circuit by step (3),
The output end of feedback signal detection circuit is connect with MCU；
Wherein, as shown in figure 3, feedback signal detection circuit include first resistor R1, second resistance R2,3rd resistor R3,
4th resistance R4, diode D1 and triode V1, one end of first resistor R1 are the input terminal of feedback signal detection circuit
INPUT, the first resistor R1 other end connect the anode of diode D1, and the cathode of diode D1 is separately connected second resistance R2 and three
The base stage of pole pipe V1, the emitter of the other end connection triode V1 of second resistance R2, and be grounded, the collector point of triode V1
Not Lian Jie 3rd resistor R3 and the 4th resistance R4 one end, the other end of 3rd resistor R3 connects first voltage VCC, the 4th resistance
The other end of R4 is the output end OUTPUT of feedback signal detection circuit.In the present embodiment, triode V1 is NPN triode.Instead
The input terminal INPUT of feedback signal detection circuit is feedback voltage, and the output end OUTPUT of feedback signal detection circuit is feedback electricity
Flat, the feedback voltage exported when external on-load switch being closed a floodgate or operated a switch by the feedback signal detection circuit is converted into low level
Or high level, the high and low level by detecting feedback level quantify the result for judging feedback signal, more convenient judges
Feedback signal, accuracy rate are high.
Step (4), MCU detect feedback signal according to feedback level, and judge that feedback voltage detection is outer based on the feedback signal
Set the state of on-load switch；
Also, as shown in Fig. 2, specific steps are as follows:
Step (4-1), MCU timing detection feedback level, timing t/ms；
Step (4-2) judges whether MCU detects feedback states, if so, step (4-5) is then transferred to, conversely, being then transferred to
Step (4-3)；
Whether the feedback level that step (4-3), judgement detect is low level, if so, then low level number adds 1, is turned
Enter step (4-4), conversely, then low level number is reset, and feedback signal is not detected in MCU, is transferred to step (4-5)；
Step (4-4) judges whether low level number is greater than N, if so, then determining that MCU detects feedback signal, and anti-
Feedback signal detecting state is to have detected；Conversely, then feedback signal is not detected in MCU；Wherein, N is positive integer；
Step (4-5), when detection interval be greater than cycle time T/ms when, then step (4-6) is transferred to, conversely, then terminating；
Step (4-6) judges whether to have detected feedback signal in the continuous N period, then decision-feedback voltage detecting
The state of external on-load switch is closed state, conversely, then the state of the external on-load switch of decision-feedback voltage detecting is to disconnect
State；Wherein, M is positive integer；
Step (4-7), feedback signal detecting state are set to and do not detect, terminate.
The value range of timing t is 1~3；The value range of cycle time T is 20~30；The N's of low level number
Value range is 3~6；The value range of feedback signal read-around ratio M is 3~6；In the present embodiment, timing t=1；Period
Time T=25；Low level times N=4, feedback signal read-around ratio M=5.
Step (5) detects external on-load switch according to the virtual condition and feedback voltage of the external on-load switch of power detection
Virtual condition judge the virtual condition of external on-load switch；
Wherein, specific steps are as follows:
Step (5-1) sends switching on order to electric energy meter；
Step (5-2) judges whether the general power of electric energy meter is greater than startup power, if so, the then external load of power detection
The virtual condition of switch is closed state, conversely, then the virtual condition of the external on-load switch of power detection is off-state；
Whether step (5-3), the state for judging that feedback voltage detects external on-load switch are closed state, if so, then anti-
The virtual condition that feedthrough voltage detects external on-load switch is closed state, conversely, then feedback voltage detects external on-load switch
Virtual condition is off-state；
Step (5-4), the virtual condition for judging the external on-load switch of power detection and feedback voltage detect external load and open
When the virtual condition of pass is off-state, then the virtual condition of external on-load switch is to disconnect, conversely, then external on-load switch
Virtual condition be closure.
Whether step (6), the command signal for judging external on-load switch are consistent with the virtual condition of external on-load switch, such as
Unanimously, then it exits, conversely, then making abnormality processing to external on-load switch.
In existing technology, if feedback signal takes halfwave rectifier mode: signal output voltage average value is higher than 60V,
When peak forward voltage is higher than 180V, electric energy meter should be identified as non-actuated state, the shape for the external on-load switch that should be identified at this time
State is "on" position；Signal peak forward voltage is lower than 10V, and electric energy meter should be identified as excited state, the external load that should be identified
The state of switch is state of operating a switch；If feedback signal takes AC220V level mode: signal output voltage virtual value is higher than
130V, electric energy meter should be identified as non-actuated state, and the state for the external on-load switch that should be identified at this time is "on" position；Signal is defeated
Voltage effective value is lower than 5V out, and electric energy meter should be identified as excited state, and the state for the external on-load switch that should be identified is shape of operating a switch
State.Therefore judged by feedback voltage, accuracy rate is high, and single power detection can have the case where erroneous judgement.
When there is following situations:
1, power supply company distributes order of operating a switch, and practical intelligent electric energy meter is operated a switch not successfully, but user's non-electricity consumption when detection, leads
Cause is mistaken for successfully operating a switch；
The situation is detected using this method, when power supply company distributes order of operating a switch, and practical intelligent electric energy meter is not
It successfully operates a switch, then it is closed state that feedback voltage, which detects the virtual condition of external on-load switch, when detection when the non-electricity consumption of user, then
The virtual condition of the external on-load switch of power detection is to disconnect, and the virtual condition for judging external on-load switch according to this method is
Closure；Then judge external on-load switch virtual condition be operate a switch not successfully, the virtual condition of external on-load switch with it is external
The command signal order of on-load switch is inconsistent, then carries out abnormality processing, solve the problems, such as erroneous judgement.
2, power supply company distributes combined floodgate order, and practical intelligent electric energy meter successfully closes a floodgate, but user's non-electricity consumption when detection, causes
It is mistaken for closing a floodgate not successfully；
The situation is detected using this method, when power supply company distribute combined floodgate order, and practical intelligent electric energy meter at
Function closes a floodgate, then it is closed state that feedback voltage, which detects the virtual condition of external on-load switch, when detection when the non-electricity consumption of user, then function
Rate detects the virtual condition of external on-load switch to disconnect, and judges that the virtual condition of external on-load switch is to close according to this method
It closes；Then judge the virtual condition of external on-load switch for combined floodgate, the virtual condition of external on-load switch and external on-load switch
Command signal order it is consistent, solve the problems, such as erroneous judgement.
When being detected using this method to the external on-load switch of electric energy meter, by the external on-load switch of power detection
Virtual condition and feedback voltage detect external on-load switch virtual condition double conditions judgement, solve in the prior art
When operating a switch or closing a floodgate, the erroneous judgement of the virtual condition of on-load switch is externally set in the non-electricity consumption of user, improves judging nicety rate, and
In the virtual condition detection that feedback voltage detects external on-load switch, feedback voltage is exported by feedback signal detection circuit
Feedback level, and judge feedback signal, by having detected feedback signal in continuous multiple periods, then decision-feedback voltage
The virtual condition for detecting external on-load switch is closed state, therefore this method is more reasonable, as a result more accurate and reliable.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of detection method of the external on-load switch of electric energy meter, it is characterised in that: the following steps are included:
Step (1), the tripping control terminal that the control line of external on-load switch and feedback line are connected respectively to electric energy meter and
Feedback terminal；
The tripping control terminal output control signal of step (2), electric energy meter, makes external on-load switch closing or opening, external negative
The corresponding output feedback voltage of lotus output switching terminal；
Feedback voltage in step (2) is exported corresponding feedback level, feedback by feedback signal detection circuit by step (3)
The output end of signal deteching circuit is connect with MCU；
Step (4), MCU detect feedback signal according to feedback level, and judge that feedback voltage detection is external negative based on the feedback signal
The state of lotus switch；
Step (5), the reality that external on-load switch is detected according to the virtual condition and feedback voltage of the external on-load switch of power detection
Border state judges the virtual condition of external on-load switch, when the virtual condition and feedback voltage of the external on-load switch of power detection are examined
When surveying the virtual condition of external on-load switch and being off-state, then the virtual condition of external on-load switch is to disconnect conversely, then
The virtual condition of external on-load switch is closure；
Whether step (6), the command signal for judging external on-load switch are consistent with the virtual condition of external on-load switch, and such as one
It causes, then exits, conversely, then doing abnormality processing to external on-load switch.
2. the detection method of the external on-load switch of electric energy meter according to claim 1, it is characterised in that: the step (2)
In control signal use alternating current 220V level mode or halfwave rectifier mode.
3. the detection method of the external on-load switch of electric energy meter according to claim 1 or 2, it is characterised in that: the step
(2) the electric energy meter input terminal in is in series with the 5th resistance R5, the 5th resistance R5 other end output control signal.
4. the detection method of the external on-load switch of electric energy meter according to claim 1, it is characterised in that: the step (3)
In feedback signal detection circuit include first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, diode D1
With triode V1, one end of the first resistor R1 is the input terminal of feedback signal detection circuit, and the first resistor R1 is another
The anode of end connection diode D1, the cathode of the diode D1 are separately connected the base stage of second resistance R2 and triode V1, institute
The emitter of the other end connection triode V1 of second resistance R2 is stated, and is grounded, the collector of the triode V1 is separately connected
One end of 3rd resistor R3 and the 4th resistance R4, the other end of the 3rd resistor R3 connect first voltage VCC, the 4th electricity
The other end for hindering R4 is the output end of feedback signal detection circuit.
5. the detection method of the external on-load switch of electric energy meter according to claim 4, it is characterised in that: the triode V1
For NPN triode.
6. the detection method of the external on-load switch of electric energy meter according to claim 1, it is characterised in that: the step (4)
In specific steps are as follows:
Step (4-1), MCU timing detection feedback level, timing t/ms；
Step (4-2) judges whether MCU detects feedback states, if so, step (4-5) is then transferred to, conversely, being then transferred to step
(4-3)；
Whether the feedback level that step (4-3), judgement detect is low level, if so, then low level number adds 1, is transferred to step
Suddenly (4-4), conversely, then low level number is reset, and feedback signal is not detected in MCU, is transferred to step (4-5)；
Step (4-4) judges whether low level number is greater than N, if so, then determining that MCU detects feedback signal, and feedback letter
Number detecting state is to have detected；Conversely, then feedback signal is not detected in MCU；Wherein, N is positive integer；
Step (4-5), when detection interval be greater than cycle time T/ms when, then step (4-6) is transferred to, conversely, then terminating；
Step (4-6) judges whether to have detected feedback signal in the continuous N period, then decision-feedback voltage detecting is external
The state of on-load switch is closed state, conversely, then the state of the external on-load switch of decision-feedback voltage detecting is off-state；
Wherein, M is positive integer；
Step (4-7), feedback signal detecting state are set to and do not detect, terminate.
7. the detection method of the external on-load switch of electric energy meter according to claim 6, it is characterised in that: the timing
The value range of t is 1~3.
8. the detection method of the external on-load switch of electric energy meter according to claim 6, it is characterised in that: the cycle time
The value range of T is 20~30.
9. the detection method of the external on-load switch of electric energy meter according to claim 6, it is characterised in that: the low level time
The value range of several N is 3~6；The value range of the feedback signal read-around ratio M is 3~6.
10. the detection method of the external on-load switch of electric energy meter according to claim 1, it is characterised in that: the step (5)
In specific steps are as follows:
Step (5-1) sends switching on order to electric energy meter；
Step (5-2) judges whether the general power of electric energy meter is greater than startup power, if so, the then external on-load switch of power detection
Virtual condition be closed state, conversely, then the virtual condition of the external on-load switch of power detection be off-state；
Whether step (5-3), the state for judging that feedback voltage detects external on-load switch are closed state, if so, then feeding back electricity
The virtual condition that pressure detects external on-load switch is closed state, conversely, then feedback voltage detects the reality of external on-load switch
State is off-state；
Step (5-4) judges that the virtual condition of the external on-load switch of power detection and feedback voltage detect external on-load switch
When virtual condition is off-state, then the virtual condition of external on-load switch is to disconnect, conversely, the then reality of external on-load switch
Border state is closure.
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| CN111049145A (en) * | 2019-12-27 | 2020-04-21 | 郑州众智科技股份有限公司 | Control method for realizing reliable grid-connected and off-grid switching of micro-grid and public grid |
| 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 |
| CN113138335A (en) * | 2021-04-16 | 2021-07-20 | 中国电力科学研究院有限公司 | Method and system for detecting Bluetooth circuit breaker |
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