CN2165549Y

CN2165549Y - Multifunctional electricity-use monitor

Info

Publication number: CN2165549Y
Application number: CN 93224584
Authority: CN
Inventors: 时文平; 肖捷; 宋宝元; 马薇薇
Original assignee: 宋宝元
Priority date: 1993-09-21
Filing date: 1993-09-21
Publication date: 1994-05-18
Anticipated expiration: 2003-09-21

Abstract

The utility model relates to a monitor which has the function of preventing the electric larceny (including magnetic electric larceny), overcurrent protection, overvoltage protection, electricity leakage protection, electrical shock protection, etc. on the power utilization of a single-phase watt-hour meter. The monitor is characterized in that an electric bridge is composed of two current mutual inductors with identical electromagnetic parameters and two resistors, wherein, the output end of the electric bridge is provided with a diode and a setting capacitor. Both sides of the watt-hour meter are provided with magnetic switches and are connected to one arm of the electric bridge to realize the monitoring on the magnetic electric larceny. The monitor has the advantages of simple circuit construction, high sensitivity and complete function.

Description

Multifunctional electricity-use monitor

The utility model belongs to the power monitoring device, especially a kind of multifunctional monitoring device to the single-phase watt-hour meter metering.

Through the Searches of Patent Literature widely, as notification number CN2120398U, CN1069837A, CN2128790Y, CN2128791Y, CN2055648U etc., a lot of similar techniques schemes are disclosed, especially more complete with the CN2055648U scheme, get up to still have following deficiency but conclude: 1 monitoring function is still not exclusively particularly to the monitoring of magnetic stealing; 2 complex structures.

It is simple that the purpose of this utility model provides a kind of circuit structure, highly sensitive, the Monitor for electricity use that function is more complete.

Realize this purpose by following technical scheme:

This device is connected on the branch family transmission line of single-phase user's kilowatt-hour meter (7) input, by touching electric-leakage detection circuit (1), stealing and over-current detection circuit (2), magnetic stealing testing circuit (3), over-voltage detection circuit (5), actuator (4) and delay recovery and warning circuit (6) are formed, wherein the output signal of overcurrent and anti-electricity-theft testing circuit (2) and magnetic stealing testing circuit (3) changes by two identical current transformer B1 of electromagnetic parameter, B2 and two resistance R 1, the poised state of the electric bridge that R2 forms, its output trigger the controllable silicon SCR 1 of actuator (4) through the diode D1 and the capacitor C 5 of adjusting.

Magnetic stealing testing circuit (3) connects an arm of the electric bridge of being made up of B1B2R1R2 by the magnetic switch ZK1, the ZK2 that are in parallel that place the kilowatt-hour meter both sides through current-limiting resistance R10.

Over-voltage detection circuit (5) changes voltage ratio by the variation that is serially connected in the piezo-resistance R8 resistance in resistance R 5, R4, R9 and D4, the D5 branch road, triggers the controllable silicon SCR 1 of actuator (4) through diode D2.

Delay recovery and warning circuit (6) are when LED 1 is reported to the police, control the controllable silicon SCR 2 that is in parallel with actuator (4) relay J through voltage-stabiliser tube DW2 by the charging voltage of capacitor C 3.

Accompanying drawing 1 is the electric theory diagram of this device;

Accompanying drawing 2 is the electrical schematic diagram of this device.

The course of work below in conjunction with the description of drawings the technical program:

When touching the electric leakage situation, produce induced signal by zero sequence current mutual inductor B0, make the SCR1 conducting through D3, C4; Current transformer B1 is installed in transmission line top, branch family with this device, and current transformer B2 is installed in transmission line end in the kilowatt-hour meter, electric bridge two arms of being made up of R1B1 and R2B2 when the electricity filching behavior of before the table that kilowatt-hour meter takes place or table back produce bigger unbalance signal, trigger SCR1 through D1, R4, D2 and make it conducting, change the numerical value of capacitor C 5 of adjusting, can determine D1 conducting current potential, promptly determine the limit power consumption according to the electricity consumption needs; When the magnetic stealing takes place, place arbitrary conducting of tongue tube ZK1, ZK2 of both sides in the kilowatt-hour meter, make electric bridge unbalance at once, make the SCR1 conducting through D1, R4, D2 equally; When the overvoltage phenomenon appearred in supply line, piezo-resistance R8 resistance reduces the current potential make the R8R4D2 tie point jumped down, and its saltus step moment makes the SCR1 conducting.

Under above-mentioned various situations, make SCR ₁After the conducting, relay J adhesive immediately action, J-2 disconnects, and cuts off supply line, stops power supply, the J-1 closure, civil power is through C1 step-down, D4, D5 full-wave rectification output dc voltage is kept the relay J adhesive, the bright warning of luminous tube LED1 this moment, through R6, R7 makes the C3 charging, voltage-stabiliser tube DW2 reverse breakdown makes the SCR2 conducting when charging voltage reaches certain value, and relay J is by short circuit, this moment, J-1 disconnected, the J-2 closure restores electricity, and is determined by the C3 charging interval its recovery time, and present embodiment was got 3 minutes, foregoing any phenomenon is not removed yet, then repeats said process immediately and continues to cut off supply line and warning.

The advantage of the technical solution of the utility model is: circuit structure is simple, controls highly sensitively, has increased antimagnetic stealing and over-voltage protecting function.

Claims

1, a kind of multi-functional Monitor for electricity use, by touching electric-leakage detection circuit (1), stealing and over-current detection circuit (2), magnetic stealing testing circuit (3), over-voltage detection circuit (5), actuator (4) and delay recovery and warning circuit (6) are formed, it is characterized in that: the output signal of overcurrent and anti-electricity-theft testing circuit (2) and magnetic stealing testing circuit (3) changes by two identical current transformer B1 of electromagnetic parameter, the poised state of the electric bridge of B2 and two resistance R 1R2 compositions, its output trigger the controllable silicon SCR 1 of actuators (4) through the diode D1 and the capacitor C 5 of adjusting; Magnetic stealing testing circuit (3) is connect an arm of the electric bridge of being made up of B1B2R1R2 through current-limiting resistance R10 by the magnetic switch ZK1ZK2 that is in parallel that places the kilowatt-hour meter both sides.

2, a kind of multi-functional Monitor for electricity use as claimed in claim 1, it is characterized in that: over-voltage detection circuit (5) is by the variation that is serially connected in the piezo-resistance R8 resistance in resistance R 5R4R9 and the D4D5 branch road, change voltage ratio, trigger the controllable silicon SCR 1 of actuator (4) through diode D2.

3, a kind of multi-functional Monitor for electricity use as claimed in claim 1, it is characterized in that: delay recovery and warning circuit (6) are when LED 1 is reported to the police, the controllable silicon SCR 2 that is in parallel through the relay J of voltage-stabiliser tube DW2 control and actuator (4) by the charging voltage of capacitor C 3.