CN107817463A - A kind of electricity anti-theft method for detecting short circuit electric energy meter - Google Patents
A kind of electricity anti-theft method for detecting short circuit electric energy meter Download PDFInfo
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- CN107817463A CN107817463A CN201711154838.6A CN201711154838A CN107817463A CN 107817463 A CN107817463 A CN 107817463A CN 201711154838 A CN201711154838 A CN 201711154838A CN 107817463 A CN107817463 A CN 107817463A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of electricity anti-theft method for detecting short circuit electric energy meter, it gathers secondary loop of mutual inductor current effective value U respectivelyiAnd electric energy meter current terminal voltage virtual value Uu, by electric energy meter current terminal voltage virtual value UuDivided by secondary loop of mutual inductor current signal UiThe voltage signal virtual value of conversion draws the equivalent voltage value U of electric energy meter current coil resistanceR, due to URIt is proportional to electric energy meter both ends resistance, by detecting URThe change of value can determine whether electric energy meter fraudulent use electricity by short-circuit.The advantage of the present invention is can to accurately distinguish the situation of the stealing of short circuit electric energy meter and the non-electricity consumption of user, and short circuit current transformer judgement is carried out using resistance variations during short circuit electric energy meter.
Description
Technical field
The present invention relates to a kind of burglar-proof electric circuit, particularly a kind of electricity anti-theft method for detecting short circuit electric energy meter.
Background technology
Under the situation of rapid development of economy, the demand of electricity consumption is growing day by day, and the expansion of electric power selling market
It has stimulated the development of whole power generation.But with expanding economy and the increase of power consumption, especially along with market economy
The foundation of system, stealing problem become more and more prominent, and country has suffered huge economic loss for this.Stealing problem is not only stranded
The development of electric power enterprise is disturbed, has also had a strong impact on the economic construction of country and the stabilization of society.
The electric energy of metering depends on voltage, electric current, power factor three and the product of time, changes any of the above key element,
It is all up the purpose of stealing.Existing stealing gimmick species is a lot, and being summed up mainly has：
(1) by secondary wiring of current mutual inductor reversal connection (stealing of electric current phase-shifting method)；
(2) in Current Transformer Secondary side loop series diode；
(3) open-circuit current transformer secondary side circuit；
(4) short circuit electric energy meter.
Wherein can be by considering the normal wiring limit by secondary wiring of current mutual inductor reversal connection (stealing of electric current phase-shifting method)
The phase current that the line voltage summation current transformer of voltage transformer detection when loading (load is pure perceptual or pure capacitive) detects
Phase relation, given threshold determines whether the generation of electricity stealing.Secondary loop of mutual inductor series diode can
With by detecting whether the positive and negative half-wave of secondary loop current is symmetrically judged.And open-circuit current transformer secondary circuit can lead to
Cross whether detection Current Transformer Secondary side voltage is judged extremely, but for short circuit electric energy meter, due to easily with user not
Electricity consumption situation is obscured, therefore there is no reliable and stable solution.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art part, and short circuit electric energy can be accurately distinguished by providing one kind
Table stealing and the situation of the non-electricity consumption of user, it is simple in construction, it is reliable, a kind of inspection having an impact will not be measured to electric energy meter
Survey the electricity anti-theft method of short circuit electric energy meter.
A kind of electricity anti-theft method for detecting short circuit electric energy meter, it is characterised in that：Secondary loop of mutual inductor is gathered respectively
Current effective value Ui and electric energy meter current terminal voltage virtual value Uu, by electric energy meter current terminal voltage virtual value Uu
Divided by the voltage signal virtual value of secondary loop of mutual inductor current signal Ui conversions draws electric energy meter current coil resistance
Equivalent voltage value UR, because UR is proportional to electric energy meter both ends resistance, electricity can be determined whether by the change for detecting UR values
Can table fraudulent use electricity by short-circuit.
Present invention collection secondary loop of mutual inductor current effective value and electric energy meter current terminal voltage are effective
Value, electric energy meter both ends resistance value is calculated using division circuit, is judged using threshold value comparison circuit if resistance value is less than normal value
Illustrate there is short circuit electric energy meter stealing, while introduce fault tolerable circuit, when excluding user's not electricity consumption, sentence without short circuit electric energy meter stealing
It is disconnected.
Judge that equivalent resistance magnitude of voltage then illustrates there is short circuit electric energy meter stealing less than normal value using threshold value comparative approach.
Situation during user's not electricity consumption is excluded using fault tolerable circuit.
A kind of burglar-proof electric circuit for detecting short circuit electric energy meter is provided, includes voltage sampling circuit, current sampling circuit, remove
Method circuit, threshold value comparison circuit, fault tolerable circuit, result display circuit, described voltage sampling circuit are arranged at electric energy meter current
Terminals are used to gather electric energy meter current terminal voltage and alternating voltage is converted into virtual value, described current sampling circuit
For gathering secondary loop of mutual inductor electric current and alternating current being converted into RMS voltage signal, voltage sampling circuit with
The voltage signal collected and current signal are sent to division circuit by current sampling circuit, the electricity that will be collected by division circuit
Pressure signal and current signal do division, obtain the equivalent voltage signal of electric energy meter current coil resistance, threshold value comparison circuit is with removing
Method circuit is connected so that compared with given threshold, the equivalent resistance signal of measurement is determined whether into the situation of fraudulent use electricity by short-circuit, described
Detection short circuit electrical energy meter anti-theft electricity circuit also include fault tolerable circuit, fault tolerable circuit shows with threshold value comparison circuit and result respectively
Show that circuit is connected, fault tolerable circuit is used for the situation for avoiding in user's not electricity consumption current sampling circuit from collecting zero, and it is in user
Result display circuit is closed during not electricity consumption, result display circuit is opened during user power utilization, as a result display circuit is used to show user
Whether stealing.
Described voltage sampling circuit realizes rectification using single supply op.
Described current sample gathers the signal of current transformer, while the friendship that will also be collected using amplifier using amplifier
Stream signal is converted to virtual value.
Division circuit turns electric energy meter current terminal voltage virtual value divided by secondary loop of mutual inductor current signal
The voltage signal virtual value changed draws the equivalent voltage value of electric energy meter current coil resistance, due to division circuit output voltage values with
Electric energy meter both ends resistance is proportional, by detecting uRThe change of value can determine whether electric energy meter fraudulent use electricity by short-circuit.
Threshold value comparison circuit has two effects, is record electric energy meter current coil resistance under normal condition equivalent first
Magnitude of voltage, by the use of the equivalent voltage value of electric energy meter current coil resistance as threshold value, when short circuit occurs, threshold value comparison circuit is defeated
Go out high level.
In summary, present invention advantage following compared with prior art：
The advantage of the present invention is can to accurately distinguish the situation of the stealing of short circuit electric energy meter and the non-electricity consumption of user, utilizes short circuit electricity
Resistance variations during energy table carry out short circuit current transformer judgement.In addition the present invention realizes that short circuit is sentenced using simple discharge circuit
Disconnected, the equipment such as single-chip microcomputer useless is simple in construction.Secondary loop voltage current signal has been used to be judged simultaneously, not secondary
Loop applies extra, electric energy meter will not be measured and impacted.Also with the resistance value conduct of electric energy meter current coil
Threshold decision, judged result are reliable and stable.
Brief description of the drawings
Fig. 1 is the schematic diagram of the electricity anti-theft method of the detection short circuit electric energy meter of the present invention.
Fig. 2 is secondary loop of mutual inductor circuit diagram.
Fig. 3 is voltage sampling circuit figure.
Fig. 4 is current sampling circuit figure.
Fig. 5 is division circuit.
Fig. 6 is threshold value comparison circuit figure.
Fig. 7 is fault tolerable circuit figure.
Fig. 8 is result display circuit figure.
Embodiment
The present invention is described in more detail with reference to embodiment.
Embodiment 1
It is a kind of detect short circuit electric energy meter electricity anti-theft method, respectively gather secondary loop of mutual inductor current effective value with
And electric energy meter current terminal voltage virtual value, electric energy meter both ends resistance value is calculated using division circuit, is compared using threshold value
Circuit judges illustrate there is short circuit electric energy meter stealing if resistance value is less than normal value, and fault-tolerant place is carried out to the non-electric situation of user
Reason.
A kind of burglar-proof electric circuit for detecting short circuit electric energy meter is provided, includes voltage sampling circuit, current sampling circuit, remove
Method circuit, threshold value comparison circuit, fault tolerable circuit, result display circuit, described voltage sampling circuit are arranged at electric energy meter current
Terminals are used to gather electric energy meter current terminal voltage and alternating voltage is converted into virtual value, described current sampling circuit
For gathering secondary loop of mutual inductor electric current and alternating current being converted into RMS voltage signal, voltage sampling circuit with
The voltage signal collected and current signal are sent to division circuit by current sampling circuit, the electricity that will be collected by division circuit
Pressure signal and current signal do division, obtain the equivalent voltage signal of electric energy meter current coil resistance, threshold value comparison circuit is with removing
Method circuit is connected so that compared with given threshold, the equivalent resistance signal of measurement is determined whether into the situation of fraudulent use electricity by short-circuit, described
Detection short circuit electrical energy meter anti-theft electricity circuit also include fault tolerable circuit, fault tolerable circuit shows with threshold value comparison circuit and result respectively
Show that circuit is connected, fault tolerable circuit is used for the situation for avoiding in user's not electricity consumption current sampling circuit from collecting zero, and it is in user
Result display circuit is closed during not electricity consumption, result display circuit is opened during user power utilization, as a result display circuit is used to show user
Whether stealing.
1. judge short circuit electric energy meter
For secondary loop of mutual inductor circuit diagram as shown in Fig. 2 wherein V1 is user power utilization power supply, CT1 is Current Mutual Inductance
Device, R1 are electric energy meter current coil equivalent resistance, and R2 is short circuit line resistance.
By current transformer measuring loop electric current i, R1 both end voltage u are measured with voltage sampling circuit, under normal circumstances,
Calculating current transformer load resistor value R=R1, load resistor value R '=R1//R2 is then measured when electric energy meter is shorted, by R '<R
It can determine whether that electric energy meter is shorted.
2. voltage sample
General virtual value sample circuit is to form rectification circuit using the unilateral conduction of diode mostly, but due to two poles
Pipe non-linear be not so that measurement effective value precision is high, when especially measuring the magnitude of voltage of electric energy meter current coil, when voltage is small
When the threshold voltage of diode, electric current cannot get through substantially, and transformed error is even more serious.Therefore when virtual value converts, utilize
Single supply op realizes rectified action instead of diode, and diode can be overcome non-linear and the influence of threshold voltage, realization are smart
Close rectification.Specific circuit is as shown in Figure 3.
Amplifier U3A is mainly used in realizing electric energy meter both ends the difference measurement of voltage in figure, and it is understood according to mould electricity principle
Output meets following relation：
U=ui1-ui2 (2-1)
Work as uAWhen input voltage is positive half cycle, amplifier U1B forms follower output voltage：
Amplifier U1A forms subtracter output voltage：
That is uADuring positive half cycle, output voltage uC and uAAmplitude is equal, and phase is identical.
Input voltage uAFor negative half period when, because of single supply op not output voltage, therefore amplifier U1B outputs are：
uB=0 (2-5)
Amplifier U1A forms subtracter output voltage：
That is uADuring positive half cycle, output voltage uCWith uAAmplitude is equal, and opposite in phase.
Circuit after filtering, voltage sampling circuit output voltage and input voltage relation can be obtained：
U is electric energy meter current coil both end voltage virtual value in formula
3. current sample
Current sample is mainly tentatively sampled the signal of current transformer by amplifier U3C, amplifier U3B, is then made
The AC signal collected is converted into virtual value with amplifier U1D, U1C, physical circuit is as shown in Figure 4.
In Fig. 4, the current signal of collection is converted into voltage signal using amplifier U3C, U3C output voltages are：
uG=iR21 (2-8)
And amplifier U3B is used for uGSignal is amplified, and its output voltage is：
And amplifier U1D, amplifier U1C are for signal rectification to be filtered into its output voltage：
4. division circuit
In Fig. 5 ,~out_u point voltages uDFor electric energy meter current terminal voltage virtual value ,~out_i point voltages uHFor electricity
The voltage signal virtual value of current transformer secondary loop current signal conversion ,~u_R point voltages uRFor electric energy meter current coil electricity
The equivalent voltage signal of resistance.
Analyzed for U1A discharge circuits, its voltage signal input and output meets following relation：
Analyzed for U2A discharge circuits, its voltage signal input and output meets following relation：
By u in formula (2-7)DU in (2-10)HFormula (2-12) is brought into obtain：
Understand that division circuit output voltage values are proportional to electric energy meter both ends resistance by formula (2-13), by detecting uRValue
Change can determine whether electric energy meter fraudulent use electricity by short-circuit.
5th, threshold value comparison circuit threshold value comparison circuit has two effects, is to record the u under normal condition firstRMagnitude of voltage,
By when using this circuit first, adjusting R18, when~out1 just export for high level when, now reference voltage source TL431
Output voltage be uR, actual conditions should suitably adjust R18, a reference value is slightly less than uRAs threshold value, second effect is to sentence
Disconnected whether to have fraudulent use electricity by short-circuit, this circuit output~out1 is high level if short circuit occurs.
It can be seen from reference voltage source circuit in Fig. 6, TL431 exports 1 terminal voltage and is：
When installing circuit first, R is adjusted18So that output comparator U2B just exports high level, now comparator both ends
Voltage meets：
u1≈uR (2-15)
Now u1 is the threshold value set, while suitably can reversely adjust R18 in order to avoid the influence of interference, and raising is sentenced
Disconnected stability.
6th, fault tolerable circuit principle fault tolerable circuit is the mistake output in order to avoid circuit, due to the division electricity used before
Road, as user not used time uHFor 0, then it can cause division circuit output abnormality.Fault tolerable circuit can identify uHFor 0 situation, user
Not electricity consumption uTExport low level and close result display circuit, user power utilization uTExport high level and open result display circuit.
7th, result is shown
Judged result is shown by driving LED, explanation has short circuit electric energy meter stealing if lamp is bright, illustrates if lamp goes out
Without short circuit electric energy meter stealing.
In table 1 ,~out1 is threshold value comparison circuit judged result, and~out2 is fault tolerable circuit judged result.
The result display circuit truth table of table 1
Elder generation's given threshold when specifically used：When having electric current in second loop return wiring normal condition and secondary circuit, regulation
R in threshold value comparison circuit18, result display circuit is observed, when result display circuit LED is just bright, slight reversely regulation
R18So that result display circuit LED is gone out, and now reference power supply output voltage is threshold value.
Result display circuit is observed, explanation has short circuit electric energy meter stealing if LED is bright, is otherwise stolen without short circuit electric energy meter
Electricity.
The not described part of the present embodiment is same as the prior art.
Claims (8)
- A kind of 1. electricity anti-theft method for detecting short circuit electric energy meter, it is characterised in that：Secondary loop of mutual inductor electricity is gathered respectively Flow virtual value UiAnd electric energy meter current terminal voltage virtual value Uu, by electric energy meter current terminal voltage virtual value UuRemove With secondary loop of mutual inductor current signal UiThe voltage signal virtual value of conversion draw electric energy meter current coil resistance etc. Imitate magnitude of voltage UR, due to URIt is proportional to electric energy meter both ends resistance, by detecting URThe change of value can determine whether electric energy meter Fraudulent use electricity by short-circuit.
- 2. the electricity anti-theft method of short circuit electric energy meter is detected according to claim 1, it is characterised in that：Sentenced using threshold value comparative approach Determine equivalent resistance magnitude of voltage and then illustrate there is short circuit electric energy meter stealing less than normal value.
- 3. the electricity anti-theft method of detection short circuit electric energy meter according to claim 2, it is characterised in that：Arranged using fault tolerable circuit Situation during except user's not electricity consumption.
- 4. the electricity anti-theft method of detection short circuit electric energy meter according to claim 1, it is characterised in that：It is short to provide a kind of detection Connect the burglar-proof electric circuit of electric energy meter, its include voltage sampling circuit, current sampling circuit, division circuit, threshold value comparison circuit, Fault tolerable circuit, result display circuit, described voltage sampling circuit are arranged at electric energy meter current terminals and are used to gather electric energy meter Alternating voltage is simultaneously converted to virtual value by current terminal voltage, and described current sampling circuit is used to gather current transformer two Alternating current is simultaneously converted to RMS voltage signal by minor loop electric current, and voltage sampling circuit will collect with current sampling circuit Voltage signal and current signal be sent to division circuit, the voltage signal collected and current signal are removed by division circuit Method, obtains the equivalent voltage signal of electric energy meter current coil resistance, and threshold value comparison circuit is connected with division circuit with by measurement Equivalent resistance signal determines whether the situation of fraudulent use electricity by short-circuit compared with given threshold, and described detection short circuit electric energy meter is thief-proof Circuit also includes fault tolerable circuit, and fault tolerable circuit is connected with threshold value comparison circuit and result display circuit respectively, fault tolerable circuit For avoiding in user's not electricity consumption current sampling circuit from collecting zero situation, it is closed result in user's not electricity consumption and shown Circuit, result display circuit is opened during user power utilization, as a result display circuit be used to showing user whether stealing.
- 5. the electricity anti-theft method of detection short circuit electric energy meter according to claim 4, it is characterised in that：Described voltage sample Circuit realizes rectification using single supply op.
- 6. the electricity anti-theft method of detection short circuit electric energy meter according to claim 4, it is characterised in that：Described current sample Using the signal of amplifier collection current transformer, while the AC signal collected is also converted into virtual value using amplifier.
- 7. the electricity anti-theft method of detection short circuit electric energy meter according to claim 4, it is characterised in that：Division circuit is by electric energy Table current terminal voltage effective value divided by the voltage signal virtual value of secondary loop of mutual inductor current signal conversion are drawn The equivalent voltage value of electric energy meter current coil resistance, because division circuit output voltage values are proportional to electric energy meter both ends resistance, By detecting uRThe change of value can determine whether electric energy meter fraudulent use electricity by short-circuit.
- 8. the electricity anti-theft method of detection short circuit electric energy meter according to claim 4, it is characterised in that：Threshold value comparison circuit has Two effects, it is the equivalent voltage value for recording the electric energy meter current coil resistance under normal condition first, utilizes electric energy meter current The equivalent voltage value of coil resistance is as threshold value, when short circuit occurs, threshold value comparison circuit output high level.
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| CN201711154838.6A CN107817463A (en) | 2017-11-20 | 2017-11-20 | A kind of electricity anti-theft method for detecting short circuit electric energy meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632448A (en) * | 2019-09-16 | 2019-12-31 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN112147390A (en) * | 2020-09-23 | 2020-12-29 | 国网山东省电力公司莒县供电公司 | Automatic alarm anti-theft electric energy meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632448A (en) * | 2019-09-16 | 2019-12-31 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN110632448B (en) * | 2019-09-16 | 2022-07-15 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN112147390A (en) * | 2020-09-23 | 2020-12-29 | 国网山东省电力公司莒县供电公司 | Automatic alarm anti-theft electric energy meter |
| CN112147390B (en) * | 2020-09-23 | 2022-12-06 | 国网山东省电力公司莒县供电公司 | Automatic alarm anti-theft electric energy meter |
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