LT5752B - A multifunctional electric energy meter - Google Patents

Abstract

The purpose of the inven ti on is to account the electric energy consumed, to protect from unaccounted consumption of electric energy ad from malfunctioning of the electricity supply circuit. The multifunctional electric energy meter consists of a single-phase or threephase electric energy metering device, an automated switch, a voltage indicator with light@indication, a thermo-compensated current transformer with two primary windings and one secondary winding, a processor with software, a digital indicator with a display screen, a@remote two-way switching module with an antenna and a module for protection of unaccounted consumption of electric energy, which consists of a current vo1tage transformer with two primary windings and one secondary winding, the terminaIs of the latter are connected to the processor and to the bridge rectifier, connected in parallel to the electrolytic capacitor to which an electromechanical activator with a threshold control circuit is connected. The phase and neutral con

Description

The invention relates to the field of electrotechnology and can be used in the manufacture of a multifunctional electricity meter for the accounting of electricity consumed and protection against unaccounted electricity consumption and disturbances in the power supply circuit mode.

Widely known electricity meters are inductive and electronic electricity meters whose mechanism, electrical circuit and operating principle are described in the technical literature, e.g. Ηπιοκοβημ A.M., “3jieKTpnuecKne cneTMHKn”, MocKBa, roc3HeproM3AaT, 1963, p. 23 - 27, "O6cnyxcnBaHne nHąyKU, noHHHX cmctmukob u enenefl yueTa b 3jieKTpoycTaHOBKax", MocKBa, 3HeproaTOMH3, naT, 1983, p. Pp. 5-11. These electric meters consist of a rotary element which forms electrical voltage and current circuits with the core, and whose aluminum disc with axial supports rotates the magnetic flux and transmits the rotational motion through a worm gear to the counting mechanism. Such power meters are connected to the supplier's mains through an automatic switch that protects the electrical circuit against short-circuiting currents and overloads, and is otherwise switched on and off manually.

The disadvantages of these well-known electricity meters are that they only count the electricity consumed, their readings are manually read, and current regulations prohibit the power meter from being directly connected to the supplier's mains, so the consumer's power supply must have an automatic switch in front of the meter. In addition, 'these electricity meters do not have effective protection against unaccounted electricity consumption, since the sealing of their casing enclosure does not prevent fraudulent users from influencing the meter readings.

The closest technical solution of the present invention is an electricity meter which performs the functions of electricity consumption and protection against unaccounted electricity consumption and consists of a single-phase or three-phase electricity meter with an additional voltage coil, user connection pads and protection against unaccounted electricity consumption. a module consisting of a current transformer through which two wires are passed through a magnetic wire, which in opposite directions flows from the supplier's mains to the electricity meter and the return from the customer's mains through the electricity meter, and the magnet wire is wound with a secondary winding differential current and whose ends are connected to a bridge rectifier whose DC contacts are connected in parallel to an electrolytic capacitor to which *

a parallel-connected electromechanical activator with a threshold control circuit. Through the contacts of the user connection pad, the user's power network is connected to the outlet of the electricity meter. Phase and zero leads through the magnetic wire are connected to one end of the circuit breaker terminals and to the other end of the electrical meter. The phase and zero wires of the supplier's mains are connected to the circuit breaker inlet. The solid connection of the consumer mains and the electricity meter in the connection pad prevents the phase and zero wires from being interchanged. When an unaccounted electricity is consumed, an electromechanical activator with a threshold control circuit shuts off the circuit breaker and thereby disconnects the power supply to the consumer (LT Patent No. 5473, TPK G01R 11/00, published on February 25, 2008).

This known device is superior to the widely known induction and electronic electricity meters because it not only accounts for the electricity consumed but also protects against unaccounted electricity consumption. However, these advantages do not compensate for the existing disadvantages, as the device consists of three separate devices, the supplied user connection pad is bulky and with a complicated contact system, the current transformer parameters have been determined by complicated experiments and therefore not sensitive enough to the resulting in ineffective protection against unaccounted electricity consumption, lack of control over supply voltage and current and power consumption, and the addition of a voltage coil to certified factory-supplied electricity meters. In addition, there is no possibility of automatically disconnecting the power supply to the user in the event of a malfunction of the electrical circuit or violation of the set limits for controlled parameters. Neither is it possible to transmit data remotely, and to receive and execute management execution commands.

The object of the invention is to increase the efficiency of protection against unaccounted electricity consumption and against disturbances in the electrical circuit mode by extending the functions of the device for measuring voltage and current values, calculating power consumption, storing and transmitting measurement and calculation data, to execute them. In addition, all devices are integrated in a single device on a multifunctional electricity meter, which could be used in place of the electrical user’s introductory metering panel.

The object of the invention is achieved by incorporating in the multifunctional electricity meter an electricity meter for measuring the consumed electricity, an automatic switch for direct connection to the supplier's mains, a voltage indicator with a light indication for supply voltage upstream of the switch, a thermo-compensated current transformer with two primary windings there is a phase and the other zero, and one secondary winding for measuring the current, a software processor, a digital display for displaying readings, a remote reciprocal switching module with an antenna for remote data transmission and receiving control commands, an unauthorized power consumption module consisting of a current-voltage transformer, the parameters of which have been calculated according to a habilitated doctor of physics for a more accurate measurement of the difference between the supply and return currents a method developed by Professor Vilius Palensky and having two primary windings, one phase and one zero, and one secondary winding, the ends of which are connected to a processor input and a bridge rectifier, to which an electrolytic capacitor is connected in parallel to the DC contacts, to which an electromechanical activator with a threshold control circuit for switching off the automatic switch is connected in parallel. Phase and zero wires of the supplier's mains are connected to the terminals of the circuit breaker, the voltage indicator and two connecting wires of the processor input to measure the supplied voltage, and the phase and zero terminals of the primary voltage and transformer windings of the current transformer are connected the other ends are connected to the beginning of the primary phase and zero windings of the thermocoupled current transformer, the other ends are connected to the inputs of the power meter. In addition, the CPU *

the inputs and outputs are further connected to a thermocoupled current transformer secondary winding end for measuring current consumption, a reciprocal switching module for transmitting data and receiving control commands, an electromechanical actuator for transmitting the control switches received and formed via a threshold control circuit. In addition, the processor includes input and output devices for measuring voltage difference, current, return and reverse current strengths, power consumption and power consumption, power input, current and current difference maximum, voltage, and minimum and maximum values. , transmission of measurement and calculation data to a digital display and remote two-way switch module for transmission to a power supplier control center, remote control execution commands, data acquisition, measurement and calculation data against predetermined allowances, and generation of control execution commands in case of violation set allowable values for controlled parameters to transmit remote and formed control execution commands to an electromechanical actuator with a threshold control circuit to disable the automatic switch . The remote reciprocal switching module has a remote reciprocal link to the power supplier control center and to the processor.

FIG. 1 is a schematic diagram of a multifunctional electricity meter which illustrates the subject matter of the invention.

The multifunctional electricity meter consists of an automatic switch 1, a current transformer with two primary and one secondary windings 2, a thermo-compensated current transformer with two primary and one secondary windings 3, an electricity meter 4, a voltage indicator with a light indication 5, a road rectifier 6, electrolytic capacitor 7, electromechanical activator 8 with threshold control scheme 9, software processor 10, processor 10 inputs 11, 12, 13, 14 and outputs 15, 16, digital display 17, remote duplex switching module with antenna 18 , Power Meter 4 Output 19, Circuit Breaker 1 Input 20, Consumer Power Grid 21, Supplier Power Grid 22, and Multifunction Power Meter Coupling 23. Such a multifunction power meter corresponds to the customer power grid-to-supplier power grid panel requirements.

A multifunctional description of the operation of the electricity meter is given below. The phase and zero wires of the consumer mains 21 are connected to the output terminals 19 of the electricity meter 4, and the phase (F) and zero (O) wires of the supply mains 22 are connected to the input 20 terminals of the circuit breaker 1. When the supply mains 22 is connected, the voltage indicator light 5 illuminates, and the processor 10, whose input 11 is connected to the phase 20 and zero contacts of the automatic switch 1 input 20, starts to measure the supply voltage. By manually switching on the circuit breaker 1, to which one end of the primary phase and zero windings of the current transformer 2 is connected, the other ends are connected to the start of the primary phase and zero windings of the thermocoupled current transformer 4 and the other ends of the windings are connected. with an electricity meter inlet, and when loaded on a consumer network, the current in the power supply circuit flows from the supplier's mains to the consumer's mains via a phase switch (F) via circuit breaker 1, current transformer 2 and thermo-compensated current transformer 3 and a power meter 4, the return current from the customer's mains supplying a zero wire (N) through the power meter 4, a series of primary zero windings connected in series to the thermocoupled current transformer 3 and the current voltage transformer 2, and 1. In a power supply circuit, the current supplied is continuously measured by a thermocoupled current transformer 3, which, through the two primary windings, supplies a supply current and a reverse current in the secondary winding which is proportional to the supply current and return current. the difference in current is continuously measured by a current transformer 2, the two primary windings of which are fed through and the reverse current in the secondary winding induces a difference in supply and return currents only when the user starts to use unaccounted electricity. When there is no malfunction in the power supply that results from a violation of pre-set control parameters (voltage differences between the maximum and minimum allowable voltages, maximum allowable power consumption, allowable maximum supply and return currents) occurs when the unregulated electricity is consumed), the processor 10 measures the value of the supplied voltage through the input 11 connected to the phase 20 and zero contacts of the input 20 of the circuit breaker 1, the input 12 connected to the secondary winding ends of the transformer 2 the difference between the current and return currents measured at the input 13, which is connected to the secondary winding ends of the thermocoupled current transformer 3, is measured in volts (V) and in the supply voltage according to the supply voltage (U) (I) Constantly calculates the amperage (A) values and the cosine fi angle of the power consumed (P) in kilowatts (kW) and electricity consumed in kilowatt hours (kWh), transmits the measurement and calculation data to a digital display 17 and a remote reciprocal switching module 14 transferred to the control center of the electricity supplier and does not form a command of execution. Upon violation of a predetermined allowable value of at least one of the controlled parameters, the processor 10, by means of parameter comparisons, detects a violation of the allowable value of a particular parameter and generates a control execution command which is transmitted to the electromechanical actuator 8 with a threshold control circuit 9 switch off circuit breaker 1 which disconnects the supplier's mains 22. In addition, after switching on the unpowered electricity supply 22, the circuit breaker 1 also disconnects and actuates the protection module for the unregulated electricity because the secondary winding ends of the current transformer 2 are also connected to the alternating voltage contacts of the bridge rectifier 6, and the direct voltage contacts are connected in parallel to the electrolytic capacitor 7 to which the electromechanical activator is connected in parallel. orius 8 with threshold control scheme 9. In the secondary winding of a voltage transformer, the induced alternating current is proportional to the difference between the supply and return currents, and the bridge rectifier 6 converts the induced alternating current to DC. The measurement and calculation data transmitted by the processor 10 output 16 to remote two-way switching module 18 are transmitted to an electrical supplier control center from which remote control execution commands to set or change control parameter allowable values, disable automatic switch 1 are transmitted to remote two-way switching module 18 to processor 10 via input 14. Digital indicator 17 on screen displays the following data: power consumption in watts (W), amperage (A), magnitude of voltage (V), leakage current (return and current) power difference in amperes (A), power consumed in kilowatt-hours (kWh). In addition, when the automatic switch 6 is turned on, the digital indicator 17 shows on the display the cause of the previous shutdown and the data on the cause of the shutdown can be stored in the memory of the processor 10 for one year.

The proposed composition of the multifunctional electricity meter, compared to the nearest technical solution, significantly more efficiently protects against unaccounted electricity consumption and performs more functions against power supply circuit malfunction - monitors the electricity consumed, measures the voltage and current, and the difference between the uses unaccounted electricity to calculate power consumption and consumes electricity, displays and stores measurement and calculation data, compares it with predefined allowable values, transmits remotely and receives remote control commands, generates control execution commands when malfunctions occur transmits accepted and formed control execution commands to the electromechanical actuator in the electrical supply chain mode or in the event of violation of the permissible value set by at least one of the controlled parameters switch off the circuit breaker which switches off the power supply to the user. In addition, all units are housed in a single housing, a multifunctional power meter that can be used in place of an electrical user input metering panel and effectively protects the power supply circuit with user-connected devices from power failures, short circuits, unacceptably high leakage currents unauthorized high or low mains voltages which can damage electrical equipment in the user's mains 21 and cause a fire. It also allows the electricity supplier to compare the power meter reading 4 'with the processor 10's calculation data, control and manage the power supply remotely, protect its interests from excess power usage and reduce the meter readings by unscrupulous consumers.

Claims (5)

DEFINITION OF INVENTION 1. Multifunctional electricity meter consisting of a single-phase or three-phase electricity meter with a voltage coil, a user terminal block and an unauthorized power consumption module, characterized in that the multifunctional electricity meter consists of an 'automatic switch', a voltage indicator with a light indication , a thermo-compensated current transformer with two primary windings, one phase and the other winding, and one secondary winding, software processor, digital display with display, remote reciprocal switching module with antenna and protection from unaccounted power consumption module consisting of from a current transformer with two primary windings, one phase and the other winding, and one secondary winding, the ends of which are connected to a processor input and a bridge rectifier to which the DC voltage contacts l a fast-coupled electrolytic capacitor with an electromechanical activator with a threshold control circuit connected in parallel, and a phase-to-zero supply voltage, a voltage indicator with a light indication to supply voltage, and a processor input connecting voltage to the circuit breaker, the phase and zero terminals of the auto-switch output are connected to one end of the primary phase and zero windings of the current transformer, the other ends of the windings are connected to the beginning of the phase and zero windings of the thermocoupled current transformer, contacts, in addition, the terminals of the secondary winding of the thermocoupled current transformer and the terminals of the two-way switching module are connected to the inputs of the processor, and two-way commutations are connected to the terminals the opening module inlet and the electromechanical actuator with threshold control, and all housed in one housing. A multifunctional electric meter according to claim 1, characterized in that the processor comprises means for measuring the difference between the applied voltage and current, the values of the supply and return currents, the power consumption and the voltage, the current, the supply and the return. for entering and modifying the current difference in current allowances, transmitting the measurement and calculation data to a digital display and remote reciprocal switching module, storing and comparing the measurement and calculation data to their predetermined allowances, to form control execution commands in the event of at least one violation the set value set for the controlled parameter or the difference between the supply and return currents when the unaccounted electricity is used, accepted by remote and formed by the control execution command ms to electromechanical actuator with threshold control circuit breaker switch off. 3. A multifunctional electric meter according to claim 1, wherein the multifunctional electrical meter has an external input as a contact for the automatic switch and an external output for the electrical meter. 4. A multifunctional electricity meter according to claim 1, wherein the electricity meter is inductive or electronic. 5. A multifunctional electric meter according to claim 1, wherein the current-voltage transformer and the thermocoupled current transformer are single-phase or three-phase.