CN1144053C - Electric power metering method and device able to detect and prevent illegal use of electric energy - Google Patents

Electric power metering method and device able to detect and prevent illegal use of electric energy Download PDF

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Publication number
CN1144053C
CN1144053C CNB001039857A CN00103985A CN1144053C CN 1144053 C CN1144053 C CN 1144053C CN B001039857 A CNB001039857 A CN B001039857A CN 00103985 A CN00103985 A CN 00103985A CN 1144053 C CN1144053 C CN 1144053C
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China
Prior art keywords
voltage
groups
connected
relay
microprocessor
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CNB001039857A
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Chinese (zh)
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CN1315660A (en
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张培欣
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张培欣
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Abstract

The present invention relates to an electric power metering method and a device which can detect and prevent electricity theft. The device comprises a microprocessor, a voltage single detecting circuit, a current single detecting circuit, a relay, a relay driving circuit and an indicating unit. An electric meter which can switch a voltage connection wire is mainly utilized so as to detect two groups of voltages and current signals in a three-phase power supply respectively, and whether a difference value of power factor angles occurs in the two groups of signals is detected. If the difference value occurs, the condition of electricity theft by improper use of a capacitor of a user is shown. Then, the voltage connection wire of the electric meter is switched, and correct electric power consumption is metered by the electric meter in a specific connection wire mode. Meanwhile, the condition of electricity theft of an electricity user is shown by a proper indicating device so as to be checked and reported.

Description

Can detect and prevent the electric power metering method and the device of stealing

Technical field

The invention relates to a kind of electric power metering method and device of detecting and preventing stealing, especially refer to a kind ofly desire to make metering ammeter misalignment and when carrying out stealing at the improper use capacitor of electricity consumer, still the actual power consumption amount be can correctly measure, and the method and the device of its stealing fact shown.

Background technology

Utilities Electric Co. mainly is the power consumption according to the ammeter recording user, and collect the electricity charge to the user according to this, but certain customers still attempt utilizing dishonest method to carry out the stealing and the short delivery electricity charge, this measure not only has a strong impact on the fairness doctrine, and cause the greatest loss of Utilities Electric Co., the method of relevant record power consumption at present and the unworthy user's stealing of part sincerely further specifies as the back:

Utilities Electric Co. generally is the power consumption that utilizes " watthour meter " promptly alleged usually ammeter record load, and a kind of watthour meter of phase three-wire three two assembly types is in order to measure three phase electric power, these phase three-wire three two assembly type watthour meters are that two groups of Monophase electric power meters are located on the same turning axle, when electric current will change the moment of torsion of turning axle during by kilowatt meter, and measure index to show by the rotation of turning axle, as shown in Figure 6, be that aforementioned watthour meter 80 is with its two groups of kilowatt meters 81,82 by outer connecting line respectively with three-phase supply end 1,2,3 and load connect, wherein kilowatt meter 81 is to be connected in the 1st, between 2 phase power supplys, 82 of another kilowatt meters are connected in the 3rd, between 2 phase power supplys, be as shown in Figure 7 according to the vector analysis of the aforementioned mode of connection:

V wherein 12, V 23, V 31Be voltage between lines

I 1, I 2, I 3Be electric current between line,

φ is the power-factor angle of load again

When load balance, V 12=V 23=V 31=V

I 1=I 2=I 3=I

P value in the aforementioned formula is the electric power under the normal metering method.

But when the user when load end is installed capacitor, then will cause watthour meter 80 misalignments, reach the purpose that the electricity charge are paid in stealing less.The application of capacitor in power supply mainly is for improving power factor, so Utilities Electric Co. promptly establishes with capacitor every one section electric power transfer spacing through being everlasting, again for the user, at mains side and connect a capacitor, also can revise the inductive phase differential, and further improve its power factor.

But aforementioned capacitor in order to stealing, be not in order to improve power factor, its connection is (its for positive phase sequence power supply mode) as shown in Figure 8, it establishes an electric capacity 90 between the third phase power supply of load end and ground connection, this electric capacity 90 will cause watthour meter 80 metering misalignments then, and its electric power metering error can be converted by following formula and learn:

V 12=V 23=V 31=V

I 3’=I 3+I 3SC

I 1=I 2=I 3=I

P A = P A 1 + P A 3

P in the aforementioned formula A

= P - 3 2 VI 3 SC

Under improper connection electric capacity 90 situations of load end, by the electric power of watthour meter 80 actual measurement gained, through converting as can be known with aforementioned formula, improper as the aforementioned connection electric capacity 90 will occur Difference, this electric power difference is the steal power that the user need not defrayment.

According to understanding, utilize the big electricity consumer of preceding method stealing that the trend that increases is gradually arranged at present, cause the heavy losses of Utilities Electric Co..This shows that there is obviously careless omission in the method for existing ammeter metering electricity consumption, remain further to be overcome improvement.

Summary of the invention

Therefore, fundamental purpose of the present invention is, a kind of electric power metering method and device of detecting and preventing stealing is provided, and it has when the improper connection electric capacity of user carries out stealing, still can correctly measure the actual power consumption amount, and shows the fact of its stealing.

The objective of the invention is to realize by following technical scheme.According to a kind of electric power metering method of detecting and preventing stealing that the present invention proposes, it includes:

One utilizes the ammeter of switchable voltage wiring to detect two groups of voltage and current signal merits in the three-phase supply respectively because of the step at angle;

One judges whether the merit of aforementioned two groups of signals the step of difference occurs because of the angle;

One when two groups of voltage and current signal merits difference occurs because of the angle, switch the voltage wiring of ammeter, to measure the step of normal power consumption;

One when switching the ammeter pressure-wire, starts the step of the indicating device explicit user stealing fact synchronously;

The pressure-wire that wherein switches ammeter is finished by following step: in two groups of coils that are provided with respectively on two groups of kilowatt meters on ammeter, there is an end of one group of coil to be connected in the 1st phase power supply, the 3rd phase power supply respectively, an other end jumps to the 3rd, 1 phase load end respectively by the normal opened contact of relay, and the normally closed contact of relay is connected to the 2nd phase power supply, when the voltage and current signal merit difference occurs because of the angle, carry out the switching of voltage wiring.

Aforesaid method is to be that ammeter is connected between power end and the load end with a phase three-wire three two assembly type watthour meters, and wherein the potential winding of ammeter is provided with relay, switches to control its wiring; This relay is then controlled by a control device.

Aforementioned control device includes:

One is connected the voltage signal testing circuit for detectable voltage signals with power supply;

One be connected with power supply by current transformer, for the current signal detection circuit of sensed current signal;

One for the microprocessor of judging power phase and voltage, current signal and phase place thereof;

One by microprocessor according to voltage, current signal judged result to drive, for showing the indicating member that the stealing situation whether occurs;

Wherein microprocessor and pilot relay simultaneously, switching the wiring of ammeter, when voltage and current signal detection circuit detect two groups of voltage and current signals and occur merit because of the angular difference value, can judge that the user has the stealing situation, and then by the ammeter wiring, to measure correct power consumption.

Purpose of the present invention also can be realized by following technical scheme.According to a kind of employed device of electric power metering method of detecting and preventing stealing that the present invention proposes, it includes:

The described employed device of electric power metering method of detecting and prevent stealing, it includes: one is connected with power supply for the voltage signal detecting circuit that detects two groups of voltage signals; One be connected with power supply by current transformer, for the current signal detection circuit that detects two groups of current signals; One for judging that whether identical power phase and two groups of voltage and current signal merits because of angle microprocessor; One by the relay drive circuit of microprocessor control with the wiring of switching watthour meter voltage; One is driven according to voltage, current signal judged result by microprocessor, for showing the indicating member that the stealing situation whether occurs; Aforementioned microprocessor is controlled a relay by relay drive circuit, to switch the voltage wiring of watthour meter; In two groups of coils that are provided with respectively on two groups of kilowatt meters on ammeter, there is an end of one group of coil to be connected in the 1st phase power supply, the 3rd phase power supply respectively, an other end jumps to the 3rd, 1 phase load end respectively by the normal opened contact of relay, and the normally closed contact of relay is connected to the 2nd phase power supply, when the voltage and current signal merit difference occurs because of the angle, carry out the switching of voltage wiring.

The invention provides a kind of electric power metering method and device of detecting and preventing stealing, it has following characteristics: promptly when the improper connection capacitor of user carries out stealing, still can correctly measure the power consumption of user's reality, to stop the situation of electricity filching person stealing, in addition, whether the present invention further detects explicit user has the stealing situation for looking into newspaper, effectively manages and stop illegal purpose and can reach resource.

Description of drawings

Control device concrete structure used in the present invention is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is the ammeter wiring diagram of the present invention in order to correct detecting electric power.

Fig. 2 is the organigram of improper use capacitor under aforementioned ammeter wiring structure.

Fig. 3 is that the present invention reaches the wiring diagram that purpose is switched in wiring in order to make ammeter.

Fig. 4 is the control device circuit diagram that the present invention is switched in order to detecting voltage, current signal and the wiring of control ammeter.

Fig. 5 is an action flow chart of the present invention.

Fig. 6 is the wiring schematic diagram of traditional watthour meter.

Fig. 7 is three-phase supply vector analysis figure.

Fig. 8 is the wiring schematic diagram of the improper use capacitor of load end.

Embodiment

Relevant electric-power metering method for detecting of the present invention roughly includes following steps:

One utilizes the ammeter of switchable voltage wiring to detect the step of two groups of voltage and current signals in the three-phase supply respectively;

One judges whether aforementioned two groups of signal merits the step of difference occurs because of angle (power factor angle);

One when two groups of voltage and current signal merits difference occurs because of the angle, switch the voltage wiring of ammeter, to measure the step of normal power consumption;

One when switching the ammeter pressure-wire, starts the step of the indicating device explicit user stealing fact synchronously.

Aforementioned first step is to be connected with power end, load end in the traditional wired mode by ammeter, and obtain two groups of voltage signals and two groups of current signals respectively, its mode of connection is as shown in Figure 6, have two groups of coils 811,812,821,822 respectively on two groups of kilowatt meters 81,82 of this watthour meter 80, wherein coil the 811, the 821st, directly is series between power end and the load end, for electric current between the line of induction, the cross-over connection of 812,822 difference of coil is between the 1st, 2 phase power supplys and the 3rd, 2 phase power supplys, with the induction voltage between lines again.Label I1, I2, I3 among Fig. 6 all represent direction of current, and wherein on behalf of electric current, I1, I3 flow to load end by power supply coils 811,821 respectively; On behalf of electric current, I2 directly flow to load end by power supply.

As previously mentioned, the improper connection electric capacity 90 of these modes of connection such as load end (as shown in Figure 8) will make watthour meter 80 measure misalignment.The direction of current of the label I3 ' representative among Fig. 8 is the electric capacity 90 that is flowed to the improper connection of load end by power supply.

Relevant aforesaid improper connection electric capacity situation, the present invention is by obtaining two groups of voltage and current signals, and the merit of judging the two (is aforementioned second because of angular difference is different to detect, three steps), because user's stealing is the 3rd phase power supply and the indirect electric capacity 90 of ground connection at load end, therefore, by the 3rd, 2 phase power supplys are obtained the merit of voltage and current signal will be with the 1st because of the angle, 2 merits that obtain voltage and current signal mutually a suitable gap occurs (under the perfect condition because of the angle, the power factor angle of these two groups of voltage and current signals should belong to unanimity), therefore, we only need judge first group of voltage and current signal the (the 1st, 2 is alternate) merit whether be not equal to second group of voltage and current signal the (the 3rd because of the angle, 2 phases), can detect user side whether the stealing situation is arranged.

Detectd out when the stealing situation is arranged when user side, even the present invention's ammeter changes the another kind of mode of connection, can effectively prevent the situation of the stealing that improper use electric capacity 90 is caused, its wiring structure is as shown in Figure 1.

Two groups of kilowatt meters 81,82 of this watthour meter 80 still directly are series between power end 1,3 phases and the load end with coil 811,821 respectively, for electric current between the line of induction, the coil 812 that another end is connected in the 1st phase power end is to be connected to the 3rd phase load end with other end span, to be connected in the coil 822 of the 3rd phase power end be to be connected to the 1st phase load end with other end span to an end again, to respond to the 1st, 3 voltages between lines that reach the 3rd, 1 phase power supply mutually respectively.

Under the aforementioned mode of connection, establish V 12=V 23=V 31=V, I 1=I 2=I 3=I

By the measured electrical power P of aforementioned watthour meter 80 BFor

= P

Under aforesaid wiring structure, as user's (as shown in Figure 2) when the improper connection of the load end electric capacity 90, the electrical power P that records of watthour meter 80 then CCan learn by following formula:

= P

From the above, under aforementioned wiring structure, even the user at the improper use capacitor of load end, also unlikely correct measurement to watthour meter 80 impacts.Again, the present invention is except that utilizing the aforementioned mode of connection to make the power consumption of watthour meter 80 correct measurement user sides, with further detecting the also illegal stealing situation of explicit user, for looking into newspaper.

Therefore, the present invention obtains two groups of voltage and current signals under the traditional wired mode of watthour meter 80, when difference appears in two groups of voltage and current signals, represent that promptly user side has the situation of improper use capacitor stealing, the voltage wiring of conversion watthour meter 80 then of the present invention, obtaining the correct metering that not influenced by capacitor, and further detect and show this stealing information, for looking into newspaper.

And in the hardware construction of implementing preceding method, at first can be as shown in Figure 3, be utilize relay 41 the electronic switch contact to switch the voltage wiring of aforementioned watthour meter 80, so that do the switching of aforementioned two kinds of wiring structure, again by the action of a control device pilot relay 41.

The circuit diagram of this control device is as shown in Figure 4, and it includes a microprocessor 10, and is subjected to relay drive circuit 40, an indicating member 50 and a power circuit 60 of microprocessor 10 controls from power end detectable voltage signals and the voltage detecting circuit 20, of delivering to microprocessor 10 from power end sensed current signal and the current detection circuit 30, of delivering to microprocessor 10 by current transformer; Wherein:

This voltage detecting circuit 20 mainly is made up of 21,22, two groups of operational amplifiers 23,24 of two groups of transformers, two transformers, 21,22 primary side are connected to respectively on the RST phase (i.e. the 1st, 2,3 phases) of power end again, its secondary coil then is connected to the anode input of operational amplifier 23,24 respectively, the output terminal of two operational amplifiers 23,24 then is connected on the microprocessor 10 respectively, transfer square-wave signal in order to voltage signal, for microprocessor its size of 10 computings and phase place priority with sinusoidal wave form.In other words, aforesaid voltage testing circuit 20 will detect two groups of voltage signals respectively on the 1st, 2,3 (RST) phase power supply.

This current detection circuit 30 is to be made up of 31,32 and two groups of operational amplifiers 33,34 of two groups of filtering circuits respectively, wherein two filtering circuits, 31,32 input ends are connected with T with the R of power end by the current transformer (not shown) respectively, to detect its current signal, filtering circuit 31,32 output terminals will be connected to the anode input of operational amplifier 33,34 again, operational amplifier 33,34 output terminals then are connected to microprocessor 10, deliver to microprocessor 10 so that will be converted to the current signal of square wave form, judge its size of current and phase place successively for computing.So aforementioned currents testing circuit 30 will be respectively by detecting two groups of current signals respectively on the 1st, 3 phases (R, the T phase) power supply.

Afterwards, microprocessor 10 will check that power supply is positive phase sequence or negative phase sequence form by aforesaid voltage testing circuit 20 and current detection circuit 30, and will judge whether user side has the stealing situation by two groups of voltage and current signals of the two detection.

This relay drive circuit 40 includes a relay 41, slow-operating relay 42 and two groups of photo-couplers that are connected with relay 41, slow-operating relay 42 respectively 43,44, wherein photo-coupler the 43, the 44th, and for isolating usefulness, it is connected to 10 liang of output terminals of microprocessor (RLSW0, RLSW1) respectively; Relay 41 has two groups of make and break contacts 411,412,421,422 respectively with slow-operating relay 42 again, the common ends of its repeat circuit 411,412 is to be connected with the coil 812,822 of two kilowatt meters 81,82, one contact (often opening) is to be connected to power supply R, T respectively to go up mutually, another contact (normally closed) then is connected in the common ends of two make and break contacts 421,422 on the slow-operating relay 42, one contact (often opening) of two make and break contacts 421,422 is for sky connects, and another contact (normally closed) then is connected to power supply S jointly and goes up mutually.

And aforementioned relay 41 is mainly in order to switch the voltage wiring of watthour meter 80,42 of slow-operating relaies are aforementioned switched voltage wiring action precompose buffering, because kilowatt meter 81,82 coil 812,822 are cutting off the electricity supply moment, great back-emf voltage may appear, impaired for preventing circuit, microprocessor 10 will be before driving relay 41 switches, the make and break contact 421 of Schilling slow-operating relay 42,422 cut to sky and connect end, making relay 41 do wiring again switches, recover the contact of slow-operating relay 42 subsequently, can prevent that so circuit is impacted by back-emf voltage.

This indicating member 50 mainly is made up of two groups of 51,52 and two groups of light emitting diodes 53,54 of photo-coupler of isolating usefulness; wherein photo-coupler 51,52 input ends are to be connected to microprocessor 10 output terminals (PH LED, PL LED); two light emitting diodes 53,54 are different colours again, can be respectively for showing normal or unusual (stealing is promptly arranged) situation.Outside indicating member 50 shows divided by the cresset form again, also can be multi-form alarm device.

The work of treatment flow process of relevant this microprocessor 10 is as shown in Figure 5, it at first will judge the phase sequence (being the ordering of R, S, T phase) of power end in advance, and after judging that power end is positive phase sequence or negative phase sequence, promptly begin to judge whether improper use capacitor of user side, determining step is to judge by microprocessor 10 whether voltage detecting circuit 20 and the current detection circuit 30 two groups of voltage and current signals that detect merit occurs because of the angular difference value, identical or very approaching because of the angle as two groups of voltage and current signal merits, the expression user side does not have improper use capacitor; Otherwise, merit as two groups of signals difference occurs because of the angle, then represent the improper use capacitor of user, then microprocessor 10 will be by the connection type (as shown in Figure 1) of relay 41 conversion watthour meters 80, to measure correct power consumption, at the same time, and will drive indicating member 50, show that with cresset this user has improper use capacitor situation, is provided as and looks into newspaper.

Claims (11)

1. the electric power metering method that can detect and prevent stealing, it is characterized in that, be to carry out each step by a control device, each step includes: one utilizes the ammeter of switchable voltage tie lines to detect two groups of voltage and current signal merits in the three-phase supply respectively because of the step at angle; One judges whether the merit of aforementioned two groups of signals the step of difference occurs because of the angle; One when two groups of voltage and current signal merits difference occurs because of the angle, switch the voltage wiring of ammeter, to measure the step of normal power consumption; One when switching the ammeter pressure-wire, starts the step of the indicating device explicit user stealing fact synchronously; The pressure-wire that wherein switches ammeter is finished by following step: in two groups of coils that are provided with respectively on two groups of kilowatt meters on ammeter, there is an end of one group of coil to be connected in the 1st phase power supply, the 3rd phase power supply respectively, an other end jumps to the 3rd, 1 phase load end respectively by the normal opened contact of relay, and the normally closed contact of relay is connected to the 2nd phase power supply, when the voltage and current signal merit difference occurs because of the angle, carry out the switching of voltage wiring by the control of relay.
2. the electric power metering method of detecting and prevent stealing according to claim 1 can be carried out each step by a control device, and it is characterized in that: this control device includes: one is connected with power supply for the voltage signal detecting circuit that detects two groups of voltage signals; One be connected with power supply by current transformer, for the current signal detection circuit that detects two groups of current signals; One for judging that whether identical power phase and two groups of voltage and current signal merits because of angle microprocessor; One by the relay drive circuit of microprocessor control with the wiring of switching watthour meter voltage; One is driven according to voltage, current signal judged result by microprocessor, for showing the indicating member that the stealing situation whether occurs; Aforementioned microprocessor is controlled a relay by relay drive circuit, to switch the voltage wiring of watthour meter.
3. according to the described electric power metering method of detecting and prevent stealing of claim 2, it is characterized in that: this relay drive circuit includes a slow-operating relay again, and it is connected between power end and the relay, as the buffering isolation features.
4. according to claim 1 or the 2 described electric power metering methods of detecting and prevent stealing, it is characterized in that: this indicating member is to be made of light emitting diode.
5. according to the described electric power metering method of detecting and prevent stealing of claim 2, it is characterized in that: this voltage signal testing circuit is by two groups of transformers and the operational amplifier that is connected with the transformer secondary output coil with anode input respectively, wherein transformer is to be connected on the three-phase supply, and the output terminal of operational amplifier then is connected to microprocessor again.
6. according to the described electric power metering method of detecting and prevent stealing of claim 2, it is characterized in that: this current signal detection circuit is by two groups of filtering circuits and the operational amplifier that is connected with the filtering circuit output terminal with anode input respectively, wherein the filtering circuit input end is to be connected with power supply by current transformer, and the output terminal of operational amplifier then is connected to microprocessor again.
7. the employed device of electric power metering method that can detect and prevent stealing is characterized in that: include: one is connected for the voltage signal detecting circuit that detects two groups of voltage signals with power supply; One be connected with power supply by current transformer, for the current signal detection circuit that detects two groups of current signals; One for judging that whether identical power phase and two groups of voltage and current signal merits because of angle microprocessor; One by the relay drive circuit of microprocessor control with the wiring of switching watthour meter voltage; One is driven according to voltage, current signal judged result by microprocessor, for showing the indicating member that the stealing situation whether occurs; Aforementioned microprocessor is controlled a relay by relay drive circuit, to switch the voltage wiring of watthour meter; In two groups of coils that are provided with respectively on two groups of kilowatt meters on ammeter, there is an end of one group of coil to be connected in the 1st phase power supply, the 3rd phase power supply respectively, an other end jumps to the 3rd, 1 phase load end respectively by the normal opened contact of relay, and the normally closed contact of relay is connected to the 2nd phase power supply, when the voltage and current signal merit difference occurs because of the angle, carry out the switching of voltage wiring.
8. according to the described electric power metering device of detecting and prevent stealing of claim 7, it is characterized in that: this relay drive circuit includes a slow-operating relay again, and it is connected between power end and the relay, as the buffering isolation features.
9. according to claim 7 or the 8 described electric power metering devices of detecting and prevent stealing, it is characterized in that: this indicating member is to be made of light emitting diode.
10. the described according to Claim 8 electric power metering device of detecting and prevent stealing, it is characterized in that: this voltage signal testing circuit is by two groups of transformers and the operational amplifier that is connected with the transformer secondary output coil with anode input respectively, wherein transformer is to be connected on the three-phase supply, and the output terminal of operational amplifier then is connected to microprocessor again.
11. the described according to Claim 8 electric power metering device of detecting and prevent stealing, it is characterized in that: this current signal detection circuit is by two groups of filtering circuits and the operational amplifier that is connected with the filtering circuit output terminal with anode input respectively, wherein the filtering circuit input end is to be connected with power supply by current transformer, and the output terminal of operational amplifier then is connected to microprocessor again.
CNB001039857A 2000-03-30 2000-03-30 Electric power metering method and device able to detect and prevent illegal use of electric energy CN1144053C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB001039857A CN1144053C (en) 2000-03-30 2000-03-30 Electric power metering method and device able to detect and prevent illegal use of electric energy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB001039857A CN1144053C (en) 2000-03-30 2000-03-30 Electric power metering method and device able to detect and prevent illegal use of electric energy

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CN1144053C true CN1144053C (en) 2004-03-31

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CN101515029B (en) * 2008-02-22 2012-05-23 深圳长城开发科技股份有限公司 Method and device for detecting abnormity of zero line of electric quantity metering device
CN102338816B (en) * 2011-06-17 2013-06-05 杭州炬华科技股份有限公司 Resistance-capacitance power supply for tri-manganin electric energy meter
CN103076476B (en) * 2012-12-18 2015-04-29 广东电网公司汕头供电局 On-line monitoring method of primary side shunt electric stealing of CT (current transformer) of 10kV special variable metering device
CN103076477B (en) * 2012-12-18 2015-04-15 广东电网公司汕头供电局 On-line monitoring method of secondary side shunt electric stealing of CT (current transformer) of 10kV special variable metering device
CN104502697B (en) * 2014-11-28 2017-10-10 上海贝岭股份有限公司 A kind of electric energy metrical structure and method
CN105319419A (en) * 2015-11-10 2016-02-10 成都九十度工业产品设计有限公司 Automatic voltage measurement ammeter
CN105425002B (en) * 2015-11-10 2018-07-27 浙江晨泰科技股份有限公司 A kind of intelligent anti-theft electricity electric meter system
CN105319421A (en) * 2015-11-10 2016-02-10 成都九十度工业产品设计有限公司 District anti-electricity stealing system
CN105424995B (en) * 2015-11-10 2018-05-01 青岛天晟达新能源科技有限公司 A kind of intelligent anti-theft electricity ammeter
CN105322538B (en) * 2015-11-10 2019-04-05 江苏小康电力科技有限公司 A kind of security power power supply system
CN105322537A (en) * 2015-11-10 2016-02-10 成都九十度工业产品设计有限公司 Electricity-stealing-preventing electric power system
CN105319412A (en) * 2015-11-10 2016-02-10 成都九十度工业产品设计有限公司 Safe intelligent ammeter
CN105319420A (en) * 2015-11-10 2016-02-10 成都九十度工业产品设计有限公司 Intelligent voltage regulation ammeter

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