RU2253121C1 - Device for connecting electric energy flow meter - Google Patents

Abstract

FIELD: electric engineering.

SUBSTANCE: device has protection automatic machine, flow meter, current converter with two primary windings and disconnecting means. Zero wire of circuit for connection of flow meter is connected to one primary winding of converter at cable input and to second primary winding after flow meter. Secondary winding of converter is connected to disconnecting means, disconnecting a user.

EFFECT: prevented unsanctioned use of electric energy.

1 dwg

Description

The invention relates to the field of electrical engineering and is used primarily in power supply to consumers.

Known schemes for connecting meters (electric energy meters that provide protection against theft, including the meter itself, backstop) [Centron MC 3 - electronic three-phase electricity meter] http: // www. actaris. com / mc3.html

A device for connecting a counter of a single-phase electronic household SOEB-1P http: // elektro. by.ru./katalog/manom/ 0017 man. htm

This counter provides protection against theft when the counter is turned on "in the opposite direction" when the counter is bypassed.

Also known is a device for connecting an electric energy meter closest to the claimed devices and adopted as a prototype. It includes a circuit breaker, a meter with protection against theft of electricity (B.A. Knyazevsky, B.Yu. Lipkin. Power supply to industrial enterprises. M: Higher School, 1984, pp. 289-299).

But all these schemes do not provide protection against theft during the removal of electricity in addition to the meter.

The invention is aimed at preventing the unauthorized use of electricity by automatically turning off the consumer during the removal of electricity in addition to the meter.

The problem is solved in that in the proposed device for connecting electric energy meters, including a circuit breaker, a meter with protection against theft of electricity, a current transformer with two primary windings is installed at the cable entry into the building, the zero wire of the electrical energy meter connection circuit is connected to the beginning of one the primary winding of the current transformer, and the end of this primary winding is connected to the zero terminal of the circuit breaker installed in front of the meter. The neutral wire after the counter is connected to the end of the second primary winding of the current transformer, the beginning of the second primary winding of the current transformer is connected to the consumer power supply circuit, while a current is proportional to the difference in currents in the neutral wire at the cable input and after the meter to the secondary the current transformer winding is connected to a trip unit that responds to the secondary current and disconnects the consumer.

The difference between the proposed device and the prototype is the presence in the circuit of a current transformer with two primary windings installed on the cable entry into the building. The zero wire of the connection circuit of the electric energy meter is connected to the beginning of one primary winding of the current transformer, the end of this primary winding is connected to the zero terminal of the circuit breaker installed in front of the meter. The zero wire after the counter is brought to the end of the second primary winding of the current transformer. The beginning of the second primary winding of the current transformer is connected to the consumer power supply circuit. A current is induced in the secondary winding of the current transformer, proportional to the difference in currents in the neutral wire at the cable entry and after the counter. A release is connected to the secondary winding of the current transformer, which responds to the secondary winding current and disconnects the consumer.

The presence of distinctive features allows us to conclude that the claimed device meets the criterion of "novelty."

The analysis of patent and scientific and technical information did not allow to identify sources containing information about the fame of the distinguishing features of the claimed invention, which indicates the compliance of the claimed invention with the criterion of “inventive step”.

The invention is illustrated in the drawing, which shows a diagram of the proposed device for connecting an electric energy meter.

In the scheme: 1 - circuit breaker, 2 - counter, 3 - current transformer with two primary windings, 4 - secondary winding of the current transformer connected to the release 5, N, K - the beginning and end of the primary windings of the current transformer.

The proposed device operates as follows.

In accordance with the rules of electrical devices (PUE), a switching apparatus is installed in front of the counter 2. In practice, in most cases, circuit breaker 1 is installed as a switching device. The presence of a circuit breaker in front of the meter allows you to drain electrical energy in addition to the meter from the terminals of the circuit breaker or by connecting the load to the cable in the area from the circuit breaker 1 to meter 2.

When electric energy is removed, in addition to counter 2, a current is induced in the secondary winding 4 of the current transformer (3), which is proportional to the difference in currents in the neutral wire at the cable input and after the counter, the release 5, which reacts to the current of the secondary current transformer, disconnects the consumer in the phase wire.

Installation of a current transformer with two primary windings in accordance with the description is possible in the phase conductor of the electrical energy meter connection circuit.

The implementation of the invention allows to prevent the unauthorized use of electricity, which provides significant economic efficiency in the implementation of the invention.

Claims (1)

A device for connecting an electric energy meter, including a circuit breaker, a meter with protection against theft of electricity, characterized in that a current transformer with two primary windings is installed at the cable entry into the building, the zero wire of the electric meter connection circuit is connected to the beginning of one primary winding of the current transformer and the end of this primary winding is connected to the zero terminal of the circuit breaker installed in front of the meter, the neutral wire after the meter is connected to the end of the second primary the current transformer windings, and the beginning of the second primary current transformer winding is connected to the consumer power supply circuit, while a current is proportional to the difference of currents in the neutral wire at the cable input and after the counter in the secondary winding of the current transformer, a trip unit connected to the secondary winding of the current transformer is connected to secondary current and disconnecting the consumer.