CN100344977C - Double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity - Google Patents
Double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity Download PDFInfo
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- CN100344977C CN100344977C CNB981106846A CN98110684A CN100344977C CN 100344977 C CN100344977 C CN 100344977C CN B981106846 A CNB981106846 A CN B981106846A CN 98110684 A CN98110684 A CN 98110684A CN 100344977 C CN100344977 C CN 100344977C
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- current
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- watt
- hour meter
- fraudulent use
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Abstract
The present invention provides a double-monitoring current comparison type apparatus for preventing the fraudulent use of electricity, which aims at the difficult problem of the fraudulent use of electricity unsolved hitherto. The present invention can thoroughly prevent various kinds of current type fraudulent use of electricity and has a new principle. The main body of the present invention is an undercurrent and undervoltage timer, and two current monitoring transformers are added. The undercurrent and undervoltage timer compares the following two signals, one signal is the output current of the current monitoring transformers and is connected with a load loop in series, and the other signal is the output current of a metering current transformer of a coil loop of the phase current which is connected with a kilowatt hour meter in series. Through the comparison of two secondary currents, the non-zero states of comparison values are timed, or whether I1 and I2 are zero or not due to wire breaking is judged, and the time of the current type fraudulent use of electricity is recorded.
Description
The invention belongs to the electrical instrument field.Monitor specifically whether watt-hour meter exists the current mode stealing, and give the instrument of timing.
For a long time, stealing electricity phenomenon is very serious always.Especially small towns and individual enterprise are more outstanding.Also only limited to the power electricity user stealing of three phase watt-hour meter in the past, stretched in recent years and used numerous domestic factories of single-phase watt-hour meter.Some power departments were once force power consumer installation＜stop-loss pressure time integrator〉etc. the anti-electricity-theft instrument of title roughly the same.Yet these instruments that arise at the historic moment really do not solve the power stealing problem so far yet.In conjunction with the single-phase watt-hour meter through current transformer CT1 access type shown in Figure 1 is the comprehensive stealing electricity method of example.
The power stealing method can be divided into two classes.One class is the voltage-type stealing, and another kind of is the current mode stealing.
(1) voltage-type stealing electricity method:
1. disconnect in watt-hour meter (W1) terminal box between the terminals 1 and 2 in flakes (some watt-hour meter by lead sealing table in carry out short circuit, can prevent this type of stealing), make not rising space of watt-hour meter.
2. connect the resistance of a big resistance after disconnecting between the terminals 1 and 2 in flakes, the branch pressure voltage coil makes watt-hour meter walk word rate and slows down.
(2) current mode stealing electricity method
The current mode stealing electricity method is a lot, and is comprehensively as follows:
1. disconnect the meter current coil loop.Promptly disconnect level K CT time
1End or K
2The line of end and meter current coil 1 end or 3 ends;
2. short-circuit current coil.Be short circuit connection terminal 1 and 3, or shunting
3. the primary coil of short-circuit current mutual inductor CT or secondary coil.
4. change instrument current transformer CT.For example change the CT of 400/5A with 1000/5A.
5. some other electricity filching means.
Existing anti-electricity-theft instrument all can not solve above-mentioned several current mode stealing problem.Therefore, some anti-electricity-theft instrument have been avoided anti-current mode stealing function at all.The product that has relates to electric current reluctantly, but also only dares to be called " cutout " function.As if can determine the behavior of the meter current coil that opens circuit.This quasi-instrument brings a kind of disadvantage on the contrary.This quasi-instrument has been stipulated the technical indicator of " electric current supervision value ", and expression is when flowing through the electric current of watt-hour meter less than nominal current I
b2 percent o'clock, instrument just is judged to stealing.This index is science not, and is also unreasonable.Because during not electricity consumption of user, instrument also is judged to stealing and gives the cumulative time, be remedied the electricity charge.Resist so this series products is subjected to the user, can't promote the use of.Because of there being the principle shortcoming, can't solve electric current stealing problem equally.
Chinese patent: application number is 92224112, and denomination of invention is: the anti electric larceny three phase device.A kind of anti electric larceny three phase technology is disclosed.It is made of amplifying circuit, comparator circuit, delay circuit and execution comparator circuit.It is characterized in that in shell 3, being equipped with detection current transformer 2 with the current transformer 10 corresponding numbers of phases of transformer 1 output terminal, each current transformer 10 output current passes relevant detection current transformer 2 iron cores and D3 and ground connection through diode D4, iron core and D2 and ground connection that the current coil 5 of the output current of metering current mulual inductor 11 by watt-hour meter 4 passes relevant detection current transformer 2 through diode D1, the signal that detects output winding 2 (a.b.c) output of current transformer 2 passes through amplifier 6 again, comparator circuit 7, delay circuit 8 is by 9 record stealing number of times and the times of topworks.With directly relatively being installed in the transformer output end current and through instrument current transformer access type two classes.
The output current of mutual inductor and metering mutual inductor is discerned electricity filching behavior.There is the principle defective in this patent, can only take precautions against two kinds of current mode stealings of the condition of having, and can not take precautions against various current mode stealings comprehensively.
Tianmen, another kind of product Hubei＜low-temperature measurement plant failure diagnostic equipment〉only be equivalent to a reference kilowatthourmeter, the working condition of watt-hour meter can only be used for taking a sample test temporarily, and long-term in-service monitoring electricity filching behavior can not be used for.
The single-phase electric energy meter series of products of the prevention stealing that Harbin Electric Meter Instrument Factory is produced increase a current coil and desire to reach anti-current mode stealing purpose on current ferric core, but in fact changing-over off-balancesheet wiring once, the function of former imagination has not just existed completely.
The object of the invention is exactly at a still unsolved stealing difficult problem so far, has proposed a kind of double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity.Can thoroughly prevent various current mode stealings.Its principle is new.
Technology contents of the present invention:
Main body of the present invention is a under-voltage calculagraph of undercurrent, it is characterized in that, sets up two under-voltage calculagraphs of supervision current transformer undercurrent in addition following two signals are compared.One is the output current that is serially connected with the electricity consumption electric current supervision mutual inductor of load circuit, and another is the output current that is serially connected with the metering current mulual inductor of this phase current wire loop of watt-hour meter.By the comparison of these two secondary currents, also promptly pass through consumer actual power consumption electric current I
1, with the metering current I that flows through current coil in the watt-hour meter
2Compare, and to the non-vanishing state timing of fiducial value, or I
1, I
2Because of opening circuit is zero judgement and the record current type stealing time.
Fig. 2 is a principle of the invention block scheme.
W-is monitored watt-hour meter, can be electromechanical watt-hour meter such as induction type, also can be electron watt-hour meter; Z
H-load; CT
2-metering current supervision mutual inductor places in the watt-hour meter, also can place in the special terminal box, for example changes a social system the former connector cover of watt-hour meter, makes it promptly can load CT
2, shelter former connection terminal again, if the connection terminal of this terminal box is also buried type (can not directly touch with lead).CT
1-electricity consumption electric current supervision mutual inductor, decide on the watt-hour meter kind its position.When watt-hour meter is direct access type, CT
1Be placed among the under-voltage calculagraph G of undercurrent.
Basic functional principle of the present invention is as follows:
I
1Be the supervision electric current of consumer power consumption electric current, I
2It is the supervision electric current of metering current of meter current coil of flowing through.
When watt-hour meter is working properly, when the current mode stealing does not promptly take place, when the current return fault does not take place yet, Δ I=I
1-KI
2=0 (K can be 1 or equal other the number), undercurrent is under-voltage, and calculagraph G is not-time.If the current mode electricity filching behavior takes place.Δ I=I
1-KI
2Be not equal to 0, then the judging circuit among the G sends signal, makes register J work among the G by driving circuit, and the accumulative total current mode stealing time is as the suitable foundation of mending the electricity charge of power department.
CT
1And CT
2Be preferably straight-through current transformer, CT
1All want lead sealing with G, its binding post all is the buried type structure.
Accompanying drawing 3 and accompanying drawing 4 are representational embodiment of the present invention.
Watt-hour meter divides single-phase, and three kinds of phase three-wire three and three-phase and four-lines by its electric current access way, respectively have direct-type again and through instrument current transformer access type two classes.
Fig. 3 is for monitoring direct access type single-phase watt-hour meter W
1/4Embodiment, and have anti-voltage-type stealing function.This figure has also represented the application process of an element in the direct access type three-phase and four-line watt-hour meter.
Fig. 4 is the embodiment that is used for monitoring through current transformer access type phase three-wire three (two elements method) watt-hour meter W3.
If the W among Fig. 3
1/4For what insert through instrument current transformer, CT then
1Use the connection (CT among Fig. 4 instead
1Be placed on the G outside); If the W among Fig. 4
3For direct access type, CT then
1Adopt the connection (CT among Fig. 3
1Move in the G).So 4 two wiring diagrams of accompanying drawing 3 and accompanying drawing have comprised the implementation method of all watt-hour meter of three kinds of each two class electric current access waies.
Among Fig. 3: I
2Be CT
2Secondary current be called metering supervision electric current, I
1Be CT
1Secondary current be called the supervision of power consumption electric current.PT is a voltage transformer (VT), and B is I
1With I
2Comparison amplification demodulator, current/voltage conversion, CT
1And CT
2Broken string identification waits functional circuit.
F is a frequency generator, and N is a frequency divider.
When cause because of electricity filching behavior Δ I＞| I
1-KI
2|, or because of CT
1, CT
2When broken string causes Δ I=0, just send decision signal U
1, by the follow-up inclusive OR gate M K that opens the sluices, D makes counter works by driving circuit.
Another road signal, after the voltage that is added on meter voltage coil is less than voltage supervision value, transducer E output signal V
GAlso allow the counter timing through inclusive OR gate M.V
IAnd V
GCan become " or " relation make counter works, also can make the counter timing separately.
According to above-mentioned course of work introduction, be understood that the principle of work of Fig. 4.
W among Fig. 3
1/4And W among Fig. 4
3Connection terminal, G connection terminal, CT
1A, CT
1CConnection terminal and band circles mark, be the buried type structure.
Anti-stealing electricity function of the present invention is as follows:
(1) anti-voltage-type stealing function.
Prevent the electricity filching means of meter voltage coil loop open circuit or dividing potential drop.Suitable voltage supervision value is set to get final product.
(2) prevent current mode stealing function.
1. short circuit meter current coil.
2. open circuit current watt-hour meter loop.
3. disconnect the instrument current transformer secondary loop.
4. the secondary or primary coil of short circuit instrument current transformer.
5. the short circuit meter current coil time, the elementary or secondary coil of short circuit instrument current transformer again.
6. replacing current transformer.
7. for direct access type watt-hour meter, electric current passed in and out the line transposition after, load is crossed current coil and is connect the earth;
8. utilize capacitive load to make the watt-hour meter counter-rotating;
9. electric current is passed in and out the line transposition and make the watt-hour meter counter-rotating;
10. when disconnecting any several lines of two supervision current transformers.This is the present invention's self-protection function of tool in addition.
Advantage of the present invention:
1. anti-stealing electricity function of the present invention is perfect, thorough.
2. principle of the invention advanced person, method is simple, and is easy for installation.
3. only increase by two shape small size current mutual inductors owing to the present invention than existing calculagraph, yet but solved complete Section's current mode stealing problem. Than patent＜Three-phase steal-preventing electrical appliance〉(suppose that it very can be anti-electricity-theft, also need one of peripheral hardware big The transformer of electric current) cost is few, and volume is little. The instrument of opposing electricity-stealing that adopts this invention to make, its cost is little, is conducive to Produce and promote the use of.
4. and HD-IA, IB type low-voltage metering mechanism failure diagnostic apparatus is compared, and has unmanned, long-term online supervision Advantage.
5. owing to cancelled " electric current supervision value " this technical indicator that is resisted because of meeting damage user benefit, So the user again can't refuse installing and using of product.
6. because of above-mentioned five advantages of tool, so the long-term huge puzzlement that can solve power department is this product consumption Will be very big, have very big economic benefit and social benefit, be a kind of important energy-saving equipment.
Claims (1)
1, a kind of double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity, main body is a under-voltage calculagraph of undercurrent, it is characterized in that, set up two supervision current transformers in addition, the under-voltage calculagraph of undercurrent compares following two signals, one is the output current that buried type is serially connected with the electricity consumption electric current supervision mutual inductor of load circuit, another is the output current that buried type is serially connected with the metering current supervision mutual inductor in this current coil loop of watt-hour meter, by the comparison of these two secondary currents, also promptly pass through consumer actual power consumption electric current I
1, with the metering current I that flows through current coil in the watt-hour meter
2Compare, and to the non-vanishing state timing of fiducial value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981106846A CN100344977C (en) | 1998-03-02 | 1998-03-02 | Double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981106846A CN100344977C (en) | 1998-03-02 | 1998-03-02 | Double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1227922A CN1227922A (en) | 1999-09-08 |
| CN100344977C true CN100344977C (en) | 2007-10-24 |
Family
ID=5220709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981106846A Expired - Fee Related CN100344977C (en) | 1998-03-02 | 1998-03-02 | Double-monitoring current comparison type apparatus for avoiding fraudulent use of electricity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100344977C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983276A (en) * | 2020-07-01 | 2020-11-24 | 宁波三星医疗电气股份有限公司 | Electricity stealing prevention method for double-loop electric energy meter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2070912U (en) * | 1990-08-11 | 1991-02-06 | 慈溪市电冰箱配件厂 | Arrangement of electric meter for avoiding or indicating fraudulent use of electricity |
| CN2206463Y (en) * | 1994-06-30 | 1995-08-30 | 巫文亮 | Timing device for electricity stealing by electric power |
-
1998
- 1998-03-02 CN CNB981106846A patent/CN100344977C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2070912U (en) * | 1990-08-11 | 1991-02-06 | 慈溪市电冰箱配件厂 | Arrangement of electric meter for avoiding or indicating fraudulent use of electricity |
| CN2206463Y (en) * | 1994-06-30 | 1995-08-30 | 巫文亮 | Timing device for electricity stealing by electric power |
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| Publication number | Publication date |
|---|---|
| CN1227922A (en) | 1999-09-08 |
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