CN2602382Y - Intelligence electric metering device for avoiding electric burglary - Google Patents

Abstract

The utility model relates to an intelligent electric metering device for preventing electricity stealing. The utility model comprises a triphase multifunctional electric energy meter (20) and an intellectualized CT (50) which is matched with the electric energy meter (20) to use and is installed in a transformer system arranged on the same position with the electric energy meter (20), while the location of the intellectualized CT (50) is different from that of the electric energy meter (20), wherein the intellectualized CT comprises an A/D converting circuit (54), a CPU (55) and a radio communication module (56); a CPU comparator of pointer (28), a radio communication module (36) and a CPU communication interface are additionally arranged in the electric energy meter (20). A microprogram in the CPU is modified to enable the electric energy meter to receive and compare current signals detected by the intellectualized CT (50). Data are transmitted between the communication module (36) of the meter (20) and the communication module (56) of the CT (50). Compared with the prior art, the electric metering device has the advantages that the fraudulence use of the electric energy can be accurately detected, and the behavior of electricity stealing can be effectively prevented, and the utility model has lower manufacturing cost, simple and practical structure and convenient field installation.

Description

The electric power meter of intelligent electricity anti-theft

Technical field the utility model relates to the device of measuring the electric power time integral, relates in particular to by microprocessor, measures power consumption with the mode with radio communication of numeral, the device of avoiding simultaneously and indicating duplicity to use.

There is the problem of how to detect and to take precautions against stealing all the time in the metering that the technical background prior art consumes electric energy for each terminal user of electric system.At present various have the major defects that anti-, as to oppose electricity-stealing function electric power meter exists and be: 1. the electric energy meter meter function of preventing, opposing electricity-stealing itself is limited, especially secondary instrumentation loop occurs that CT is that the current transformer signal is shunted, when short circuit, false wiring or open circuit, can't carry out timely and effectively, detect accurately and judge; 2. the anti-electricity-theft device that function is more complete must be independent of outside the electric energy meter meter, and cost height, installation and maintenance inconvenience can't large tracts of land be promoted the use of.

The summary of the invention technical problem to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and proposes a kind ofly can effectively prevent, oppose electricity-stealing, and the electric power meter of the lower intelligent electricity anti-theft of cost.

The technical scheme that the utility model is used to solve the technical problem is: the electric power meter that manufactures and designs a kind of intelligent electricity anti-theft, comprise the three-phase multifunctional electrical energy meter meter, especially also comprise being used and will being installed in the same voltage transformer system with position, described electric energy meter meter place with described electric energy meter meter and don't be that the intelligent CT in same place is a current transformer.This CT comprises that A/D is that mould/number conversion circuit, CPU are CPU (central processing unit), and wireless communication module.Set up table meter CPU comparator circuit, wireless communication module and CPU communication interface in the described three-phase multifunctional electrical energy meter meter.Microprogram in the described CPU is modified to and makes this electric energy meter meter can receive the detected current signal of described intelligent CT, compares simultaneously.Pass through wireless channel transmissioning data between the wireless communication module of described electric energy meter meter and the wireless communication module of described intelligent CT.

Compare with prior art, the outstanding advantage of the utility model electric power meter is, can detect duplicity more exactly and use electric energy, effectively takes precautions against electricity filching behavior and takes place.And the utility model apparatus cost is lower, and is simple in structure, practical, on-the-spot easy for installation, has the large tracts of land promotional value.

Description of drawings Fig. 1 is a general logical block diagram of describing the electric power meter of the utility model intelligent electricity anti-theft;

Fig. 2 is the principle of work block diagram that has the multifunctional electric energy meter meter 20 of radio communication function in the utility model electric power meter;

Fig. 3 is the principle of work block diagram that to have the intelligent open-close type CT of radio communication function in the utility model electric power meter be current transformer 50;

Fig. 4 is to use the utility model device, only sets up the circuit catenation principle figure of CT 50 in voltage transformer system b phase circuit, and 30 is prior art electric energy meters among the figure;

Fig. 5 be voltage transformer system under three-phase four-wire system wiring situation, use the utility model and only insert the circuit catenation principle figure of CT50 at center line, 30 is prior art electric energy meters among the figure;

Fig. 6 is the basic circuit diagram of the wireless communication module 36 of multifunctional electric energy meter meter 20 in the utility model device;

Fig. 7 is the basic circuit diagram that has the intelligent open-close type CT of radio communication function in the utility model device;

Fig. 8 is the metering section basic circuit diagram of described electric energy meter meter 20;

Fig. 9 is the funtion part basic circuit diagram of described electric energy meter meter 20;

Figure 10 is the simple and clear software flow pattern of CPU microprogram in the described electric energy meter meter 20.

Embodiment is described in further detail below in conjunction with the most preferred embodiment shown in each accompanying drawing: the electric power meter of the utility model intelligent electricity anti-theft, at first be, the original place of inserting the three-phase electric energy meter meter in voltage transformer system, use the three-phase multifunctional electrical energy meter meter 20 that increases intelligent processing and radio communication function within it instead, and each phase of primary side (high-pressure side) at described voltage transformer system, or the intelligent CT that only has additional radio communication function mutually at b is current transformer 50, referring to Fig. 4.In described supply transformer system is the situation of three-phase four-wire system wiring, can also be only at the center line of secondary side intelligent CT50 to be set, referring to Fig. 5.The electric power meter general logical block diagram of the utility model intelligent electricity anti-theft is seen Fig. 1.

For each situation of all setting up intelligent CT50 mutually at described voltage transformer system, the current value that this CT50 must be recorded is compared respectively with the respective electrical flow valuve that the electric energy meter meter 20 in being connected on same supply line mutually records.At described situation of setting up intelligent CT50 mutually, the then current value that this CT50 is recorded at the b of voltage transformer system

The current phasor that records in other two-phase with electric energy meter meter 20 and

Compare in table meter CPU comparator circuit 28, electric energy meter meter 20 also need only be measured a phase and c electric current mutually certainly.The above sets up intelligent CT50, is the primary side of setting up in described supply transformer system (high-pressure side), and described CT50 is an open-close type current transformer.

The electric power meter of the utility model intelligent electricity anti-theft, comprise three-phase multifunctional electrical energy meter meter 20, referring to Fig. 2, especially also comprise being used and will being installed in the same voltage transformer system with position, described electric energy meter meter 20 place with described electric energy meter meter 20 and don't be that the intelligent CT in same place is a current transformer 50, see Fig. 3.This CT50 comprises that A/D is that mould/number conversion circuit 54, CPU are CPU (central processing unit) 55, and wireless communication module 56.Described intelligent CT50 sees Fig. 7, comprises two current transformers of A, B, or two output of A, B winding is arranged on the same magnetic core, and wherein CTA is used to measure current value, and CTB is used to provide whole C T50 required control power supply.IC 101 is computation chips among Fig. 7, and it accepts the tested current signal that CTA sends, and carries out A/D and changes and transformation result is delivered to chip microprocessor U2 carry out calculation process, and data are sent to host CPU chip IC 1 by radio receiving transmitting module U1 after the computing.

Set up table meter CPU comparator circuit 28, wireless communication module 36 and CPU communication interface in the described three-phase multifunctional electrical energy meter meter 20, referring to Fig. 2, Fig. 6, Fig. 8 and Fig. 9.Electric energy meter meter 20 also comprises voltage counter 23, active power counting device 24, reactive power counting device 25 and frequency counter 26 among Fig. 2, they all accept the signal imported respectively from analog signal processing circuit 22, and all via SPI interface 27 input table meter CPU comparator circuits 28.The communication interface of described electric energy meter meter 20 comprises pulse output interface 32, infrared communication interface 34 and RS485 communication interface 35, and they all set up the bi-directional exchanges of information passage with table meter CPU comparator circuit 28.Fig. 6 is the basic circuit diagram of wireless communication module 36, and U1 is the radio receiving transmitting module that receives, sends one among the figure.Wireless signal is received or is sent by antenna ANTENNA, 433 kilo hertzs of carrier frequencies, and the transmitting-receiving control of its data and coding, decoding, and error correction is finished by chip microprocessor U2.Fig. 8 is the metering section basic circuit diagram, IC101 among the figure～103rd, and computation chip, its major function is that electric current, the voltage signal that will collect carry out computing and quantification, for the host CPU chip IC 1 among Fig. 9 provides data.Fig. 9 is the funtion part basic circuit diagram, also comprises Chinesizing LCDs 33, and it has the bi-directional exchanges of information passage with table meter CPU comparator circuit, is used for the various readings of indicating gauge meter.Host CPU chip IC 1 is analyzed the data that obtain, compare, and flowing to LCD then is that LCDs 33 shows, input EEPROM storage also can be carried out copying of data by integrated circuit (IC) 8 and get.

Microprogram in the described CPU is modified to and makes this electric energy meter meter 20 can receive the detected current signal of described intelligent CT50, compares simultaneously, sees the simple and clear software flow pattern of Figure 10.Pass through wireless channel transmissioning data between the wireless communication module 36 of described electric energy meter meter 20 and the wireless communication module 56 of described intelligent CT50.

The current transformer CT50 of the utility model electric power meter, its working power 52, current signal collection 53, A/D conversion 54, CPU55, wireless communication module 56 and antenna 57 are combined into an autonomous device, and be the open-close type current transformer of being convenient to install, its central opening comprise rectangle with circle.The current parameters that this CT device has test line converts digital signal to and launches the function of exporting by antenna 57.Since during described CT50 work with measured supply line be in etc. idiostatic on, so need not do the special technique processing to insulation.Can adopt special-purpose PDA palm PC during actual the use, the parameters such as transformer ratio, address code of described CT50 are set by wireless mode.

Considering has high pressure and low-voltage circuit at the scene simultaneously, is construction safety and convenient the installation, and described CT50 is designed to retractable structure.For reducing cost and reducing installation workload, often a CT need only be installed at the scene is current transformer in actual use.Because for three-phase three-wire system, $\stackrel{\→}{\mathrm{Ia}}+\stackrel{\→}{\mathrm{Ib}}+\stackrel{\→}{\mathrm{Ic}}=0,$ Promptly $\stackrel{\→}{\mathrm{Ia}}+\stackrel{\→}{\mathrm{Ic}}=-\stackrel{\→}{\mathrm{Ib}},$ B installs a CT mutually and gets final product.In described electric energy meter meter 20, get

Vector and collect with CT50

Compare and get final product.

In the situation of three-phase four-wire system, $\stackrel{\→}{\mathrm{Ia}}+\stackrel{\→}{\mathrm{Ib}}+\stackrel{\→}{\mathrm{Ic}}=\mathrm{In},$ Can only on center line, install a CT additional.Consider three-phase four-wire power supply, each impossible mutually complete equipilibrium is so as long as In is greater than 2 peaces on center line, described CT50 can reliably working.

For fear of under little current conditions, misjudging, in the described electric energy meter meter 20 of actual modification during the microprogram of CPU, can will must be judged as necessary condition greater than 5% of its ratings by arbitrary phase current in the measuring three-phase current.

In table meter CPU comparator circuit 28, comparison residual quantity Δ I exceeds predefined limit value, and can conclude has had fault or had electricity filching behavior to take place, and will report to the police immediately.The alerting signal of output is carried out remote real-time monitoring by modes such as RS485 serial line interface, GPS network, GSM short message or radio bearers controls.

It below is used each the main components and parts detail list of the anti-electricity-theft electric power meter most preferred embodiment of this novel intelligent.

Circuit symbol title model, the IC of specification manufacturer 101～103 computation chips 9105 IC of South Africa SAMES company 4～7, IC 14～17 memory 24C128 IC 2 detection of power loss chip MAX708 IC 1 host CPU chip UPD78P0308 IC 8 telecommunication circuit MAX485 IC 12,13 frequency dividers, 4040 U1 radio receiving transmitting module U2 chip microprocessor AT90S2313

Claims (9)

1. the electric power meter of an intelligent electricity anti-theft, comprise three-phase multifunctional electrical energy meter meter (20), it is characterized in that: also comprise being used and will being installed in the same voltage transformer system with described electric energy meter meter (20) position, place with described electric energy meter meter (20) and don't be that the intelligent CT in same place is current transformer (50); This CT (50) comprises that A/D is that mould/number conversion circuit (54), CPU are CPU (central processing unit) (55), and wireless communication module (56);

Set up table meter CPU comparator circuit (28), wireless communication module (36) and CPU communication interface in the described three-phase multifunctional electrical energy meter meter (20), microprogram in the described CPU is modified to and makes this electric energy meter meter (20) can receive the detected current signal of described intelligent CT (50), compares simultaneously;

Pass through wireless channel transmissioning data between the wireless communication module (36) of described electric energy meter meter (20) and the wireless communication module (56) of described intelligent CT (50).

2. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

Described three-phase multifunctional electrical energy meter meter (20) also comprises voltage counter (23), active power counting device (24), reactive power counting device (25) and frequency counter (26), they all accept the signal imported respectively from analog signal processing circuit (22), and all via SPI interface (27) input table meter CPU comparator circuit (28).

3. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

The communication interface of described electric energy meter meter (20) comprises pulse output interface (32), infrared communication interface (34) and RS485 communication interface (35), and they all set up the bi-directional exchanges of information passage with table meter CPU comparator circuit (28).

4. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

Described electric energy meter meter (20) also comprises Chinesizing LCDs (33), and it has the bi-directional exchanges of information passage with table meter CPU comparator circuit, is used for the various readings of indicating gauge meter.

5. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

Described intelligent CT (50) comprises two current transformers of A, B, or two output of A, B winding is arranged on the same magnetic core, and wherein CTA is used to measure current value, and CTB is used to provide whole C T (50) required control power supply.

6. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

Described intelligent CT (50) is arranged on the primary side (high-pressure side) of described supply transformer system.

7. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

In described supply transformer system is the situation of three-phase four-wire system wiring, can only at center line intelligent CT (50) be set.

8. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

Described CT (50), its working power (52), current signal collection (53), A/D conversion (54), CPU (55), wireless communication module (56) and antenna (57) are combined into an autonomous device.

9. according to the electric power meter of the described intelligent electricity anti-theft of claim 1, it is characterized in that:

Described CT (50) is an open-close type current transformer, its central opening comprise rectangle with circle.

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