BG64684B1 - Device for metering and monitoring the consumption of active electric power - Google Patents

Abstract

The device comprises a metering unit (1), one of the outputs (2) of which is coupled to a calculation and control unit (3), coupled two-way to a unit for light and digital indication (4) and a unit for cutting off the supply of electric power to the user (5). Unit (1) has a second output (6) for a signal for wrong connection of the electric meter, and a third output (7) for a signal for the presence of mains voltage. These two outputs are connected to the respective inputs of the calculation and control unit (3), to which a unit for energy independent memory (8) is two-way connected, units (1and 5) are connected in series to the mains phase. The device can also include a unit for internal switching of billing rates (10), a unit for external switching of billing rates (11), and supply unit (12), as well as a transceiver unit (13), connected by means of an input-output line (15) to a central dispatcher point (16), or to a mobile operator-bills collector.

Description

The present invention relates to a device for measuring and controlling the consumption of active electricity, which is used in the power systems of domestic and industrial consumers.

BACKGROUND OF THE INVENTION

According to published patent application GB A 2 259 779, a device for measuring and controlling the consumption of active electricity, comprising a measuring unit comprising a frequency converter for the mains voltage and mains current, is known. The outputs of the two converters are connected to the first and second inputs of the unit for calculation and control (microprocessor), which is connected to the unit for light and digital indication (display), unit for on / off, power supply to the consumer and to the unit for receiving - Transmitter for contact with the central dispatch point.

A disadvantage of the known device is the inability to detect improper connection of the meter to the grid, as well as improper manipulation of its inputs for the purpose of theft of electricity.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a device for measuring and controlling the consumption of active electricity that enables the indication and control of the correct connection of its inputs to the grid, as well as the indication and transmission of data at any attempt to manipulate the meter ( for example by bypassing its measuring inputs).

The objective was achieved by creating a device for measuring and controlling the consumption of active electricity, including a metering unit, one output of which is connected to a metering unit and connected in a bidirectional manner to a light and digital indication unit and a power supply interruption unit. of electricity to the consumer. It is characteristic of the device that the measuring unit has a second signal output for correct connection of the meter and a third output signal for the presence of mains voltage, where these two outputs are connected to respective inputs of the unit for calculation and control, to which two-way a nonvolatile memory block is also connected. The metering unit and the power supply interruption unit are connected in series in the grid phase.

In a suitable embodiment of the device, an internal rate switching unit is connected in a bidirectional manner to the unit for calculation and control.

In another embodiment, an external tariff switch unit is linked to the calculation and control unit.

It is also advisable to include a power supply unit connected between phase and zero of the mains.

In another preferred embodiment, the calculation and control unit is connected bidirectionally to a transceiver unit for connection to a central dispatch point or to a collector.

The advantages of the invention are that the device allows monitoring of improper connections of the meter, which prevents theft of electricity. It can also be ensured that the inputs of the meter are properly connected to the grid, which increases the accuracy and reliability of the metering of the consumed electricity. The unit also responds when the mains voltage drops so that the actual consumption data is maintained. In addition, the device's structure allows it to be built on a LonWorks technology base, ensuring high reliability of information processing and transfer. This base also allows for the easy construction of grid systems for metering, control and management of electricity consumption, as well as for the addition of new reporting functions for the consumption of water, gas and others.

Explanation of the annexed figures

Figure 1 is a block diagram of an apparatus for measuring and controlling the consumption of active electricity according to the present invention.

Examples of carrying out the invention

The device for measuring and controlling the summed active electricity (Fig. 1) consists of a measuring unit 1, one output 2 of which is connected to a calculation and control unit 3 connected in a bidirectional manner to a light and digital display unit 4 and a block 5. The metering unit 1 has a second output 6 for a signal for correct connection of the meter and a third output 7 for a signal for the presence of mains voltage, where these two outputs are connected to the corresponding inputs of the calculated unit. is the control 3 to which two-way connected and block non-volatile memory 8. The unit of measurement 1 and the means for interrupting the supply of electricity 5 are connected in series in the phase of the network 9.

An internal rate switching unit 10 is connected to the calculation and control unit 3 in a bidirectional fashion. The external tariff switching unit 11 may also be connected to the unit 3.

The device may also include a power supply unit 12 connected between phase and zero of the electrical network 9.

Alternatively, a bidirectional transceiver unit 13 may be connected to the calculation and control unit 3 for connection to a central dispatching point or to a collector. The device connects to the phase between the network 9 and the load (consumer) 14.

The device for measuring and controlling the consumption of active electricity according to the present invention proceeds as follows.

Connecting the device to the AC mains 9 and the consumer 14 provides a consistent flow of the consumer's current 14 through the measurement unit 1 and the power supply interruption unit 5. These units are also connected to the zero conductor of the network by a common internal connection. connection conditions are created in the measurement unit 1 to receive signals corresponding to the instantaneous values of current and voltage. After the computational processing of these signals, the first output 2 of block 1 receives a series of pulses whose tracking frequency is a function of time and is an information carrier of the active power of the consumer 14. This pulse series enters the block for calculation and control 3, where, after continuous integration, data on consumed active electricity is obtained and accumulated. This data is supplied to the light and digital display unit 4 via a bidirectional connection. At the third output Ί of measurement unit 1, a serial pulse signal is obtained indicating the presence of a supply voltage. This signal is received in the calculation and control unit 3. When the signal indicating a power failure occurs, the data of the consumed electricity is transmitted via a two-way serial link in the non-volatile memory unit 8, where they are stored until the supply voltage occurs.

The second output 6 of the measurement unit 1 receives a logical signal, which, entering the calculation and control unit 3, informs it in cases of incorrect connection of the device to the network 9 and to the consumer 14. The data for this state of incorrect connection is received via the serial connection to the light and digital display unit 4, where the corresponding message is displayed.

The device can be checked and calibrated at the site during operation or in the laboratory by receiving a pulsed light signal from an LED located in the light and digital indication unit 4 and controlled by the calculation and control unit 3. Receiving the pulse a light signal is provided by a portable or stationary photosensitive receiver equipped with a pulse counter for a specified period of time.

When an external tariff switch unit 11 is added to the structure of the device, the device can account for the consumption of electricity at two tariffs. The required control signal is received at the "Tariff" input from an external clock. The logical signal received at the output of block 11 is received in the block for calculation and control 3.

The embedded hardware and software capabilities of the calculation and control unit 3 allow for the extension of the control and measurement functions of the device by adding to its structure a transceiver unit 13 connected to the unit 3 via a serial data exchange channel. Through the I / O line 15 for transmitting and receiving data, the device can be connected to a common network with a dispatch point 16 for centralized recording of electricity consumption and sending of control signals. This gives the device the following additional features:

- interruption of electricity, which is carried out by the block 5. In this case, by command 3 to the dispatcher, the block 3 produces a pulse control signal which is sent to the first input of the block 5 to switch off the consumer or to the second input of the block 5 to switch on of the consumer. At the output of block 5, a logical signal is received by means of 5 which, by means of block 3 at the control station 16, receives information about the execution of the shutdown command or the power on of the consumer. The output signal of unit 5 can also be used by the dispatcher to detect the presence of manipulation (shunt) connections for the purpose of power theft. The option of switching off the consumer is applied when the pre-set load or energy consumption limit is exhausted or payments are not settled;

- implementation of a multi-tariff mode of operation with the addition of the internal tariff switching unit 10, which is connected to the block 3 through a serial bidirectional connection. In block 10, multiple tariffs may be introduced by the dispatcher over time. These tariffs are set depending on the day or calendar considerations related to electricity production, the distribution of goods in the energy system, the price of electricity and others.

The organization of block 13, line 15 and the corresponding transceiver at the control station 16 is based on the Lon Works technology, which provides the necessary connection stability and data exchange reliability. The physical medium for implementing the I / O data line 15 may be a two-wire line, a radio link, or a power supply network. In the case of radio communication, the tasks of the operator from the dispatch point 16 may also be performed by the mobile collector operator.

A common power supply unit 12 may be included in the structure of the device, which provides the necessary internal DC voltage for the individual units of the device.

Claims (5)

1. A device for measuring and controlling the consumption of active electricity, including a metering unit, one output of which is connected to a metering and control unit connected bidirectionally to a light and digital indication unit and a power interruption unit to the consumer, characterized in that the measuring unit (1) has a second output (6) for a signal for correct connection of the meter and a third output (7) for a signal for the presence of mains voltage, wherein these two outputs are connected to the corresponding inputs. block for calculation and control (3) to which two-way connected and block non-volatile memory (8), the unit of measurement (1) and the means for interrupting the supply of electricity (5) are connected in series in the phase of the network. A device according to claim 1, characterized in that an internal rate switching unit (10) is connected to the calculation and control unit (3) in two directions. Device according to claim 1, characterized in that an external rate switching unit (11) is connected to the unit for calculation and control (3). Device according to one of Claims 1 to 3, characterized in that it also includes a power supply unit (12) connected between the phase and zero of the electrical network. Device according to one of Claims 1 to 4, characterized in that the calculation and control unit (3) is connected in a bidirectional manner to the transceiver unit (13) for connection to a central dispatch point (16) or to a collector.