CN2208282Y

CN2208282Y - Multifunctional monitor for electric charge evasion

Info

Publication number: CN2208282Y
Application number: CN 94229154
Authority: CN
Inventors: 韩中来
Original assignee: Shenyang Institute of Automation of CAS
Current assignee: Shenyang Institute of Automation of CAS
Priority date: 1994-07-19
Filing date: 1994-07-19
Publication date: 1995-09-20
Anticipated expiration: 2004-07-19

Abstract

The utility model belongs to a monitoring arrangement for anti-electricity theft. The external of the utility model is provided with a casing, the inner of the casing is provided with circuit control panel, and the generating wire of the inlet wires of the power supply of the circuit control panel is provided with electric current monitoring points and electric voltage monitoring points which combine with an electric meter; the electric current of the electric current coils of the electric meter, the electric voltage of electric voltage coils and the electric potential of the generating line are compared with achieve the functions of alarm, power failure, resetting, etc. Of the electricity theft situations of the circuit in the state of abnormality. The utility model has the advantages of simple circuit structure, reliable and stable circuit and high precision, the utility model can achieve alarm and power failure towards any electricity theft, and therefore, the utility model is favorable to protect the normal power supply of circuits.

Description

Multifunctional monitor for electric charge evasion

The utility model belongs to the supervising device of opposing electricity-stealing.

It is current that domestic civilian what the most generally adopt is induction meter.In order to metering AC220V, the power of the single-phase active energy of 50Hz, let it be to the greatest extent, and product type is a lot, but basic structure is similar, and induction meter mainly is made up of driving element, braking member, rotating element and register.The rotating element of kilowatt-hour meter is exactly an aluminium disks in fact.After disk rotates, drive register by transmission mechanism, thus the power of metering electric energy, and the torque of ordering about the disk rotation is produced by driving element.The driving element of kilowatt-hour meter is made of series electrical magnet and electromagnet in parallel.Series electrical magnet claims current element again.It is made up of iron core and the current coil on iron core.Electromagnet in parallel claims voltage component again, and it is made up of iron core and the potential winding on iron core.The alternating flux that series connection and electromagnet in parallel produce has separately produced eddy current moment later on thereon by the aluminium dish, thereby the aluminium dish is rotated.The braking member of kilowatt-hour meter is a permanent magnet, and it produces braking moment so that the rotating speed of aluminium dish and measured power are directly proportional when the aluminium dish rotates.The prior art of Here it is civilian electric energy metrical.Induction meter is in the shortcoming that prevents on the stealing problem: the key that induction meter can measure electric energy is the rotation of aluminium dish, and ordering about two necessary conditions that the aluminium dish rotates is the electric current of current coil and the voltage of potential winding.The purpose of stealing is to implement by one of following method: show wiring more 1.; 2. short circuit current coil; 3. off voltage coil; 4. live wire is by load ground connection.Use arbitrary method to reach stealing.

For solving the deficiency of above kilowatt-hour meter, the utility model provides a kind of multi-functional stealing monitoring system, cooperates kilowatt-hour meter to use, and will cut off user's power supply automatically after reaching stealing, stops power supply, and reports to the police automatically, through the purpose of the automatic recovery of power supply of delaying time again.

The structural design of the utility model is achieved in that this multi-functional its structure of stealing watch-dog is that the outside is a housing, circuit control panel is housed in housing, the current/voltage test point is housed in the bus of electric power incoming line, its circuit structure is that the current transformer that detects electric current I 1 in the house lead in circuit connects rectification, enter the subtracter input after the filtering, another road connects rectifier for the current transformer that detects meter current coil electric current I 2, enter another input of subtracter behind the filter, subtracter output connects the comparator input terminal with logic level and fixed reference voltage, its output A is connected to the logical circuit input, another road is that circuit voltage DC level for voltage signal behind rectifying and wave-filtering is common through voltage follower output B and A, after oppositely, enter the time-delay of reporting to the police, power-down circuit (as shown in Figure 2), warning delay cut-off circuit and time-delay reset circuit are by 2 NE555 time-base circuit (NE1, NE2), buzzer HA, relay Z1 and Z2, timing resistor electric capacity Rt and Ct and discharge resistance Rt1 constitute, relay Z1 has only one group often to open Z1 and normally closed Z1 contact, Z2 has two groups often to open Z2-1 and Z2-2 and normally closed Z2-1 and Z2-2 contact formation, power-down circuit by relay Z2 often open Z2-1 and normally closed Z2-1 contact constitutes, (as shown in Figure 3) time-base circuit NE1, the control end of NE2 (5 pin) inserts Vcc1=5V, NE1 is a bistable circuit, and output is connected into " suction electric current " formula with load.NE2 is a monostable circuit, and output is connected into " output current " formula with load.

H=0(low level when normal electricity consumption or not electricity consumption), V01 is a high level, and V02 also is a high level.This moment the Z1 dead electricity, Z2 gets electronic work, the normal opened contact Z2-1 of Z2 connects main circuit power supply, guarantees that major loop is unimpeded, the user is electricity consumption at any time.When with any means stealing, H=1(high level 3～3.5V) is greater than 1/2Vcc1, so V01 is a low level, NE1 exports conducting over the ground, the HA energising sounding alarm while, relay Z1 gets electronic work, and its normal opened contact Z1 connects Rt, Ct, NE2 begins regularly, and timing is: T=0.69RcCt more than is the time-delay of reporting to the police.

Its operation principle: sense is that kilowatt-hour meter can measure electric energy accurately and needs two necessary conditions, and Here it is the electric current of current coil and the voltage of potential winding has determined at first will carry out the detection and the conversion of electric current and voltage for this reason.

1. the detection of two electric currents and conversion

At first carry out the detection of two electric currents, one is a house lead in electric current I 1, and the test point of this electric current is vital.Its two electric current I 2 for the detection meter current coil, because it is thicker that meter current coil has a conductor cross-section, the number of turn is few, with the characteristics that load is in series, so the principle that the each point electric current equates in series loop of holding concurrently again is the effective value I1=I2 of two electric currents, show (1) if I1=I2, belong to normal electricity consumption, or I1=I2=0, by belonging to normally not electricity consumption.(2) if I1 ≠ I2, I1＞I2 is then arranged, show that house lead in electric current I 1 has loss after test point, when I2=0 or I1＞I2＞0, illustrate that the house lead in electric energy has been stolen, I1＜I2 is impossible.

Current Transformer TA1 and TA2 detect I1 and two electric currents of I2.Adopting rectification is that the principle of instrument accordingly is transformed to direct voltage UI1 and UI2 through detection (non-energy conversion), voltage stabilizing and filter circuit with the current signal of I1, I2 with I1, I2 current signal.When subtracter and voltage comparator can be found out V0＜Vref, A=1,0,1 in two formulas mean logic level.Obviously, Vo＞Vref is Vo＞0, A=0 then, and A=1 has stealing; Vo＜Vref simultaneously, i.e. Vo＜0, A=1 then, A=0 does not have stealing.The logical variable A of comparator output will with another logical variable B fellowship logical operation of voltage measurement conversion.

2. the detection of potential winding voltage V and conversion.The voltage of meter voltage coil is to order about another necessary condition that the aluminium dish rotates, therefore, this voltage have or not promptly that sign has or not the voltage system stealing.The measurement point of this voltage V is chosen in the hook place of kilowatt-hour meter, the voltage that records behind capacitance decompression again through detection, voltage stabilizing, filtering again voltage stabilizing to can with TTL or the compatible DC level of CMDS circuit, the function of signal processing link that Here it is.

The DC level of voltage signal through the pass of logic level B of voltage follower output it and voltage V is: potential winding no-voltage during as B=0; Potential winding has voltage when B=1, B signal and the logical operation of a-signal fellowship.

The design of combinational logic.Known logical signal A is the logic level of electric current I 2 after comparison of house lead in electric current I 1 and meter current coil, and signal B is the logic level of meter voltage coil voltage signal, and A, B signal have following feature:

A=0, then I1=I2 or I1=I2=0, i.e. normally electricity consumption or not electricity consumption;

A=1, then I1＞I2 or I2=0 promptly have the electric current stealing;

B=0, then the potential winding no-voltage has the voltage system stealing;

B=1, then potential winding has voltage, the stealing of no-voltage mode.

Know from logical relation: H=AB, H=AB

H=0 is normal electricity consumption and normally not electricity consumption (promptly not having stealing)

H=1 is for there being electricity filching behavior (comprising current system voltage system and voltage, electric current dual mode electricity filching behavior).So two logical variables will have following four kinds of results:

1.A=0 B=0 has voltage system stealing H=1

2.A=0, normal electricity consumption of B=1 or not electricity consumption H=0

3.A=1 B=0 has current/voltage dual mode stealing H=1

4.A=1 B=1 has current system stealing H=1

In above-mentioned four kinds of results, electricity filching behavior has three kinds, i.e. current system, and voltage system and current/voltage be two plants total modes.Normal electricity consumption of user or not electricity consumption have only a kind of, show that the result who judges normal value is single.

Combinational logic has guaranteed no matter electricity filching person adopts which kind of means (refer to the short circuit current coil, live wire is shown wiring and decoupling device more by load ground connection) stealing, the output H=1(high level of combinational logic), have only normal electricity consumption or not electricity consumption H=0(low level).

The advantage of the utility model: Device for prevention of electric charge evasion has power cutoff mechanism, at first sends warning in case stealing constitutes the fact, cuts off the electricity supply thereupon and stops power supply, and electricity filching person is not reached give the purpose of thinking.

The induction meter external lead wire has 4, limits if break through " lead sealing ", processes to reach the stealing purpose on these 4 lead-in wires.

Device for prevention of electric charge evasion and kilowatt-hour meter are used, and the Device for prevention of electric charge evasion external lead wire has 10, add 4 of kilowatt-hour meters totally 14 lead-in wires, if moving wherein any one of electricity filching person will be cut off the power supply, stop power supply, and make it not reach the stealing purpose.

The utility model detailed structure is provided by following examples and accompanying drawing.

Fig. 1 is multi-functional stealing watch-dog shape assumption diagram;

Fig. 2 is multi-functional stealing watch-dog electrical schematic diagram;

Fig. 3 is multi-functional stealing watch-dog warning delay cut-off and time-delay telegram in reply electrical schematic diagram;

Fig. 4 is multi-functional stealing watch-dog test point connection layout;

Fig. 5 is multi-functional stealing watch-dog subtracter electrical schematic diagram;

Fig. 6 is multi-functional stealing watch-dog comparator electrical schematic diagram.

Its outline drawing as shown in Figure 1,1 is housing, 2 is loam cake, 3 is louvre, and 4 is ventilating board, and 5 are attachment plug, 6 is plug, and 7 is the plug loam cake, and it connects lead-in wire and knows from Fig. 4, a is the house lead in poling, and b is a kilowatt-hour meter, and c is an insulating terminal, d is a binding post, 11,12 is that the test point of house lead in electric current I 1 connects 13 with bus, 14 is current coil electric current I 2 test points, connects with current coil, 15,16 is potential winding voltage detecting point, in parallel with bus, 17,8 is to cut off the control point, connects with bus, 9 are control power supply interchange end, in parallel with bus, its electrical schematic diagram as shown in Figure 2, it connect to be inserted and slotting joining of being connected of Fig. 4.

Claims

1, a kind of multi-functional stealing watch-dog that connects kilowatt-hour meter, it is characterized in that this watch-dog outside is a housing (1), housing is equipped with circuit control panel in (1), the current/voltage test point is housed in the bus of electric power incoming line, its circuit is that the current transformer that detects electric current I 1 in the house lead in circuit connects rectifier, enter the subtracter input behind the filter, enter another input of subtracter behind the current transformer connection rectifying and wave-filtering of another road for detection meter current coil electric current L2, subtracter output connects the comparator input terminal with logic level and fixed reference voltage, its output A is connected to the logical circuit input, another road is that circuit voltage DC level for voltage signal behind rectifying and wave-filtering is common through voltage follower output B and A, after oppositely, enter the time-delay of reporting to the police, power-down circuit, and time-delay reset circuit.

2, by the described watch-dog of claim 1, it is characterized in that reporting to the police time-delay, power-down circuit and time-delay reset circuit by 2 NE555 time-base circuits (NE1, NE2), buzzer HA, relay Z1 and Z2, timing resistor electric capacity Rt and Ct and discharge resistance Rt1 constitute, its repeat circuit Z1 has only one group often to open Z1 and normally closed Z1 contact, Z2 has two groups often to open Z2-1 and Z2-2 and normally closed Z2-1 and Z2-2 contact and constitute, power-down circuit by relay Z2 often open Z2-1 and normally closed Z2-1 contact constitutes.