CN2170524Y

CN2170524Y - Multifunctional energy-saving single-phase watt-hour meter

Info

Publication number: CN2170524Y
Application number: CN 93237189
Authority: CN
Inventors: 曹毓徐; 缪爱军; 徐先东
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-28
Filing date: 1993-06-28
Publication date: 1994-06-29
Anticipated expiration: 2003-06-28

Abstract

The utility model relates to a multifunctional energy-saving single-phase watt-hour meter which is an energy saving watt-hour meter with the functions of anti-electricity theft, anti-electric leakage, anti-electric shock, over-voltage protection and energy saving. A metering circuit composed of voltage coils and current coils is arranged in the meter housing of the watt-hour meter, and the watt-hour meter is connected with an energy-saving circuit and a protective circuit.

Description

Multifunctional energy-saving single-phase watt-hour meter

The utility model is a kind of watt-hour meter, particularly a kind of energy-saving kilowatt-hour meter with anti-electricity-theft, electric leakage, electric shock and over-voltage protecting function.

Existing general watt-hour meter has only the function of metering power consumption; in the watt-hour meter of patent applied for; also only find to have the watt-hour meter of anti-electricity-theft and overcurrent protection, anti-electricity-theft economize on electricity or threshold currents, anti-electricity-theft electric shock function, find no still that collection is anti-electricity-theft, the watt-hour meter of electric leakage, electric shock, overvoltage protection and energy-saving multifunctional.

The purpose of this utility model is: a kind of design proposal of single-phase multifunctional energy-saving kilowatt-hour meter is provided, makes it have anti-electricity-theft, electric leakage, electric shock, overvoltage protection and energy-conservation function simultaneously.

Specific embodiments of the present utility model is: the single-phase multifunctional energy-saving kilowatt-hour meter has the metering circuit that is made of current coil and potential winding is housed in watchcase, the watchcase, is connected to energy-saving circuit and holding circuit on the metering circuit.Energy-saving circuit is formed by being installed at the energy-saving control circuit that measures the energy-saving current transformer on the circuit output line in the watchcase and be connected with energy-saving current transformer; Energy-saving control circuit comprises rectification circuit, the filtering behind the rectification circuit, the mu balanced circuit that is connected with energy-saving current transformer, the mu balanced circuit output signal is as the The Trigger of Bidirectional Triode Thyristor signal, and the potential winding in the bidirectional triode thyristor control metering circuit is switched on or switched off.Holding circuit is by two current transformers that are installed in the watchcase on the metering circuit output line, and the signal processing circuit that is connected with current transformer, acknowledge(ment) signal treatment circuit output signal also produce the control executive circuit that measures circuit output line on-off in the control corresponding watchcase and form.Signal processing circuit comprises the balancing circuitry of being made up of two rectification circuits and potentiometer that is connected with two current transformers respectively, the balancing circuitry output signal is after a balance polar circuit identification, produce through filtering circuit, mu balanced circuit the main control silicon controlled is triggered control signal, the main control controllable silicon is connected with the control executive circuit.The control executive circuit also is connected to the overvoltage crowbar that is made of the sample circuit that is connected with metering circuit output line, the bilateral diode that links to each other with sample circuit, and bilateral diode is controlled the utmost point with the main control silicon controlled and is connected.

Major advantage of the present utility model is: during user power utilization, energy-saving circuit can make the potential winding of watt-hour meter in running order automatically, during not electricity consumption of user, energy-saving circuit makes the potential winding breaking circuit again automatically, reduces self power consumption of potential winding when not electricity consumption of user.In addition, when stealing or electric leakage, electric shock, short circuit, overvoltage are arranged, can block power supply automatically, reach the effect of holding circuit.

Below in conjunction with drawings and Examples the utility model is further specified:

Accompanying drawing: single-phase multifunctional energy-saving kilowatt-hour meter wiring diagram.

Embodiment:

The metering circuit (seeing accompanying drawing) that has current coil L1 identical and potential winding L2 to constitute in the single-phase multifunctional energy-saving kilowatt-hour meter with general watt-hour meter, in watt-hour meter, add current transformer BZ1 on the output line, BZ2, BZ3, BZ1 and rectifier bridge DA, capacitor C 1, C2, C3, resistance R 1, R2 and diode D1, D2 connects into energy-saving circuit, two output terminals of BZ1 are connected with two input ends of rectifier bridge DA respectively, when load is arranged, the output of DA is through C1, C2, R1 filtering, diode D1, after the D2 voltage stabilizing, provide trigger voltage by R2 to bidirectional triode thyristor SCR1 again, make the SCR1 conducting, potential winding L2 obtains operating voltage, the watt-hour meter operate as normal.

Current transformer BZ2; BZ3 and rectifier bridge DB; DC; DE; potentiometer W1; capacitor C 4; resistance R 3; diode D3; D4; the solenoid of unidirectional controllable silicon S CR2 and relay J connects into anti-electricity-theft; electric leakage; get an electric shock; the short-circuit protection circuit; J1; J2 is two normally closed contacts of J; two output terminals of BZ2 and BZ3 are connected with two input ends of DB and DC respectively; stealing or electric leakage are being arranged; get an electric shock; during short circuit; BZ2; the output of BZ3 is respectively through DB; after the DC rectification; polarity is opposite; absolute value does not wait; W1 exports unbalanced voltage after DE identification polarity; again through C4; R3 filtering; D3; the D4 voltage stabilizing; trigger output voltage; make the SCR2 conducting, the J adhesive makes its normally closed contact J1; J2 opens; block power supply, reaching is having stealing or electric leakage; get an electric shock; the purpose of protection circuit under the situation of short circuit.

Overvoltage crowbar is formed by connecting by resistance R 4, R5, potentiometer W2, capacitor C 5, bidirectional trigger diode Q, unidirectional controllable silicon S CR2 and relay J; when the circuit overvoltage; when the sampling voltage that connects the sample circuit that forms by R4, W2, R5, C5 reaches and triggers bilateral diode Q and puncture required voltage; bidirectional trigger diode Q punctures; give instantaneous trigger voltage of unidirectional controllable silicon S CR2; the SCR2 conducting; the relay J adhesive; two normally closed contact J1, J2 are opened; block power supply, reach the purpose of overvoltage protection.

Reset button AN of serial connection between the normally opened contact N of controllable silicon SCR 2 and some M of being connected in series of relay J and relay, when stealing, electric leakage, electric shock, overvoltage, another side is got in relay two contacts, its solenoid directly taps between two supply lines, produce self-insurance, throw off with the ammeter output terminal always J1, J2 two contacts, treat that above-mentioned situation is got rid of after, press reset button AN, J1, J2 can reset.

W1 can regulate electric shock, earth leakage protective disjunction sensitivity.

W2 can regulate overvoltage protection disjunction value.

Single-phase multifunctional watt-hour meter course of action is described as follows:

When watt-hour meter has load,, produce induced voltage, by commutation diode DA rectification owing to there is electric current to pass current transformer BZ1; Capacitor C 1, C2 filtering, diode D1, D2 voltage stabilizing provide trigger voltage to bidirectional diode thyristor SCR1 by resistance R 2 again, bidirectional triode thyristor SCR1 conducting, meter voltage coil L2 obtains operating voltage.

When non-loaded, current transformer BZ1 does not produce induced voltage, and SCR1 ends, and potential winding L2 can not get operating voltage, and therefore, when not having negative cutting, not loss of meter voltage coil electric energy reaches purpose of saving.

When not having stealing, electric leakage, the generation of electric shock situation, the electric current that passes among current transformer BZ2, the BZ3 equates, the induced voltage of BZ2, BZ3 is also equal substantially, after commutation diode DB, DC rectification, polarity is opposite respectively, flows to potentiometer W1, the central point of W1 is zero potential substantially, unidirectional controllable silicon S CR2 can not get triggering, can not conducting, and DC relay is failure to actuate.

When stealing, electric leakage, electric shock situation, owing to not waiting, the electric current that passes current transformer BZ2, BZ3 do not produce unequal induced voltage, after commutation diode DB, DC rectification, polarity is opposite respectively, flows to potentiometer W1, again after diode DE identification polarity, trigger output voltage makes unidirectional controllable silicon S CR2 conducting, DC relay J adhesive locking, block power supply, reach purpose anti-electricity-theft, that leak electricity, get an electric shock.

In the time of in supply voltage is in normal range, the sample circuit sampling voltage that is connected into by resistance R 4, potentiometer W2, resistance R 5 and capacitor C 5 does not reach the voltage breakdown of diac Q, and this circuit is in waiting status.

When supply voltage exceeds allowed band; the sampling voltage of sample circuit reaches diac Q voltage breakdown; diac Q punctures; give instantaneous trigger voltage of unidirectional controllable silicon S CR2; the SCR2 conducting; the negative source of disconnecting is cut off in relay J adhesive and locking, reaches the purpose of fault overvoltage protection.

During short circuit, the induced voltage of current transformer BZ2, BZ3 rises suddenly, the also corresponding rising of induced voltage difference between the two, and when reaching the trigger voltage of SCR2, the SCR2 conducting, relay adhesive and locking are cut off the electricity supply, and reach the purpose of short-circuit protection.

Claims

1, the single-phase multifunctional energy-saving kilowatt-hour meter has watchcase, and the metering circuit that is made of current coil and potential winding is housed in the watchcase, it is characterized in that: be connected to energy-saving circuit and holding circuit on the metering circuit.

2, according to the described single-phase multifunctional energy-saving kilowatt-hour meter of claim 1, it is characterized in that: energy-saving circuit is formed with the energy-saving control circuit that is connected with energy-saving current transformer by being installed at the energy-saving current transformer that measures on the circuit output line in the watchcase.

3, according to the described single-phase multifunctional energy-saving kilowatt-hour meter of claim 2, it is characterized in that: energy-saving control circuit comprises rectification circuit, the filtering behind the rectification circuit, the mu balanced circuit that is connected with energy-saving current transformer, the mu balanced circuit output signal is as the The Trigger of Bidirectional Triode Thyristor signal, being switched on or switched off of the potential winding in the bidirectional triode thyristor control metering circuit.

4, according to claim 1 or 2,3 described single-phase multifunctional energy-saving kilowatt-hour meters, it is characterized in that: holding circuit is formed by being installed to measure two current transformers, the signal processing circuit that is connected with current transformer, the acknowledge(ment) signal treatment circuit output signal on the circuit output line in the watchcase and produce the control executive circuit that measures circuit output line on-off in the corresponding control watchcase.

5, according to the described single-phase multifunctional energy-saving kilowatt-hour meter of claim 4, it is characterized in that: signal processing circuit comprises the balancing circuitry of being made up of two rectification circuits and potentiometer that is connected with two current transformers respectively, the balancing circuitry output signal is after a balance polar circuit identification, produce through filtering circuit, mu balanced circuit the main control silicon controlled is triggered control signal, the main control controllable silicon is connected with the control executive circuit.

6, according to the described single-phase multifunctional energy-saving kilowatt-hour meter of claim 5; it is characterized in that: the control executive circuit also is connected to the sample circuit that is connected by with metering circuit output line; the overvoltage crowbar that the bilateral diode that links to each other with sample circuit constitutes, bilateral diode is connected with the main control silicon controlled control utmost point.