RU2548618C2 - Network block to monitor power supply quality - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: invention relates to metrology and may be used to control energy quality. A device comprises a voltage transformer, signal level matchers by phases A, B and C, an ADC of phases A, B and C; temporary storage registers, a reference value storage register, circuits of comparison of the measurement result with the reference value, a mechanism of sample intervals setting, a reference value shaper for analogue-digital converters. The device also comprises a frequency measurement channel, which includes a level matcher, a mechanism of sample intervals setting, a reference voltage shaper, a level comparator, a timer-counter, circuits of comparison with the reference value. The channel for measurement of battery voltage comprises comparators of level by lower and upper voltage limit, reference voltage shapers, circuits of fault detection. Also the device comprises a channel of real-time clock. The device is controlled with a control unit that controls a controller of recording into a memory. Data arrives either to an electrically reprogrammable nonvolatile memory or to a controller of USB interface and RS-232 interface. The indication unit is made in the form of a panel of single indicators.

EFFECT: expansion of functional capabilities of a device.

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Description

The invention relates to the field of information-measuring and computer technology and can be used to control energy quality while maintaining the control results in long-term memory, with reference to the date and time.

A voltage analyzer is known from the state of the art, which contains an input signal to DC voltage converter, n bit shift registers, n counters, a statistical processing unit and a statistical moments calculation unit, which consists of a converter of instantaneous voltage values to a digital code (RF patent No. 2024880). The disadvantages of this technical solution are the lack of functions for measuring the non-sinusoidality of the voltage curve, the magnitude of the pulse voltage, voltage unbalance, frequency deviation, the inability to save the measurement results in non-volatile memory.

Also known is the "Statistical analyzer of quality and metering of energy consumption." The analyzer contains a current input terminal and an input voltage terminal, an electricity meter with a built-in pulse sensor, an AC to DC converter, an analog-to-digital converter, a register, a digital memory unit, a pulse counter, a sampling pulse generator, a clock pulse generator, a pulse distributor (RF patent No. 2260842). The disadvantages of this technical solution are the lack of functions for measuring the non-sinusoidality of the voltage curve, the magnitude of the pulse voltage, voltage unbalance, the lack of communication interfaces with external devices.

Also known is the “AC Voltage Monitoring Sensor”, the sensor contains a reference voltage source, the amplitude of which does not depend on the controlled voltage, and the phase differs by an angle multiple of 180 °, containing a comparator with a delayed response, a double integrator with output voltage limitation and a differentiating circuit, an amplifier reference voltage, input of the reference voltage source. It is used for high-speed control of the disappearance or sharp change in excess of the tolerance of the instantaneous value of the sinusoidal voltage with the issuance of a signal indicating this event (RF patent No. 2095818). The disadvantages of this technical solution are the lack of functions for measuring the non-sinusoidality of the voltage curve, the magnitude of the pulse voltage, voltage unbalance, frequency deviation, the inability to save the measurement results in non-volatile memory.

Closest to the claimed technical solution is a "Statistical analyzer of the quality of the parameters of electric energy", which contains a converter of the input signal into a direct voltage, a multi-limit comparison unit, channels consisting of counters and switches, a control unit, a statistical processing unit, a sampling interval adjuster and a calculation unit statistical moments (RF patent No. 2096788). The disadvantages of this technical solution are the lack of functions for measuring the non-sinusoidality of the voltage curve, the magnitude of the pulse voltage, voltage unbalance, frequency deviation, the inability to save the measurement results in non-volatile memory.

The task to which the invention is directed, is to expand the functionality of the device.

The technical result is the ability to continuously monitor the quality of electricity, which includes monitoring the voltage in phases A, B and C, monitoring the frequency of the voltage, monitoring the voltage of the battery, the ability to record monitored parameters to external memory, the ability to communicate with external devices via RS-232 and USB

The technical result is achieved by the fact that the network unit for controlling the quality of power supply contains converters of the input signal into a digital code, the outputs of which are connected to the inputs of the temporary storage registers, the outputs of which are connected to the inputs of the multi-limit signal comparison unit with a reference value, the output of which is connected to the input of the control unit, the output of which is connected to the input of the display unit, an additional unit for measuring the voltage of the battery is introduced into it, the output of which is connected to the circuit accident conditions, a block for measuring the frequency of a sinusoidal voltage, containing a level matching device, a frequency reference driver, a level comparator, a sampling interval adjuster, a timer-counter, a comparison circuit with a reference value, a memory controller controller unit designed as a controller that provides communication with external devices via RS-232 interface, USB interface, writing to an external memory module, the input of which is also connected to the output of the control unit, the output of which is also connected to the inputs of the interface controller and USB and RS-232 controller.

The battery voltage measuring unit is made in the form of max and min level voltage shapers connected to the inputs of two comparators of the voltage limit levels at the lower and upper boundaries, connected to the battery failure detection circuit, connected to the memory recording controller and the input of the control unit.

The control unit is made in the form of a microcontroller having control outputs to a comparison circuit with a reference value for measuring the frequency of a sinusoidal voltage, a memory write controller, a USB interface controller, an RS-232 interface controller, an indication unit and inputs connected to the outputs of a multi-limit signal comparison unit with a reference value.

The display unit is made in the form of a panel of single indicators.

The invention is illustrated by the functional diagram in figure 1. The network control unit contains:

- voltage transformer (1), generating a signal voltage proportional to the voltage of each phase;

- a signal level coordinator in phase A (3), brings the signal level to the level required by an analog-to-digital converter (ADC);

- the signal level coordinator in phase B (4), brings the signal level to the level required by the ADC;

- the signal level coordinator in phase C (5), brings the signal level to the level required by the ADC;

- analog-to-digital phase level converters A, B and C (18, 19, 20);

- registers for temporary storage of the measurement result (22, 23, 24);

- the register of storage of reference values (29);

- schemes for comparing the measurement result with a reference value (26, 27, 28);

- set interval selector (6);

- voltage reference driver for analog-to-digital converters (7);

- a block for measuring the frequency of a sinusoidal voltage, consisting of a level matcher (8), a frequency reference driver (9), the output of which is connected to the input of a level comparator (15), a sampling interval setter (10), the output of which is connected to the input of the timer-counter ( 21), the output of which is connected to the input of the comparison circuit with a reference value (25);

- battery voltage measuring unit (2), consisting of reference voltage formers max and min level (12, 13) connected to the inputs of two comparators of voltage limit levels at the lower and upper boundaries (11, 14) connected to the battery accident detection circuit batteries (16);

- real time clock (17);

- memory write controller (31);

- an electrically reprogrammable non-volatile memory device (33);

- USB interface controller (35) and RS-232 interface (34);

- display unit (32), made in the form of a panel of single indicators;

- a control unit (30) made in the form of a microcontroller having control outputs to a comparison circuit with a reference value for measuring the frequency of a sinusoidal voltage (25), a memory write controller (31), a USB interface controller (35), an RS-232 interface controller ( 34), an indication unit (32) and inputs connected to the outputs of the multi-limit signal comparison unit with a reference value (26, 27, 28).

The network unit operates as follows: a signal proportional to the voltage at the phases is supplied from the voltage transformer (1) to the level coordinators (3, 4, 5), which are voltage dividers, where it is brought to the level necessary for the operation of analog-to-digital converters (18 , 19, 20). Based on the signal generated by the master of sampling intervals (6), the signal levels are converted to a digital code, which is recorded in the data temporary storage registers (22, 23, 24). The signal conversion is performed relative to the reference voltage generated by the ADC reference voltage driver (7). The recorded digital code of the signal level is compared with the reference value stored in the register of reference values (29). When the signal goes beyond the permissible levels determined by GOST 13109-97, a special record is formed in the memory recording controller (31) containing the date and time received from the real-time clock (17) and the signal level values, which are recorded in a long-term storage device ( 33). At the same time, the control device generates a signal “CURRENT EMERGENCY 400 V” and a signal “EMERGENCY 400 V” on the display unit (32), made in the form of a panel of single indicators. The “CURRENT ALARM 400 V” signal is removed when the acceptable voltage values in the network are reached.

The signal from the VT (1) is fed to the level coordinator (8), where it is brought to the value necessary for the level comparator (15) to work. The level comparator (15) extracts the frequency component from the signal and transfers it to the pulse counter-timer (21). According to the signal of the set time interval selector (10), the timer-counter (21) performs pulse counting, which are compared with the reference value (25), and if the value does not match the permissible value, a special record is created in the memory controller (31) containing the date and time obtained from the real-time clock (17), and the value of the measured frequency, which is recorded in the EEPROM (33). At the same time, the control unit (30) generates the signal “CURRENT ALARM 400 V” and the signal “ALARM 400 V” to the display unit (32). The signal "CURRENT ALARM 400 V" is removed when the acceptable frequency values in the network are reached.

The voltage on the battery of the battery (2) is supplied to two comparators - “Comparator max level of the battery” (11) and “Comparator min level of the battery” (14). On comparators, the battery voltage is compared with the reference voltage generated by the voltage reference shapers (12, 13). If the battery voltage is less than or greater than the reference voltage, the comparators of the limit voltage levels at the lower and upper boundaries (11, 14) give a signal to the accident detection circuit (16). Based on this signal, the control unit (30) generates the signal “CURRENT ACCIDENT BATTERY” and the signal “ACCIDENT BATTERY” to the display unit (32). The “CURRENT BATTERY ACCIDENT” signal is removed when the acceptable battery voltage values are reached. When the signals “CURRENT ACCIDENT 400 V”, “ACCIDENT 400 V”, “CURRENT ACCIDENT BATTERY” and “ACCIDENT BATTERY” appear, the control unit (30) writes the current voltage level indicators to the EEPROM memory (33) with the date / time data received from real time clock (17).

Data stored in the EEPROM (33) can be transferred to an external storage device via the USB port (35). The data transfer operation starts automatically by the USB interface controller (35) when an external storage device is connected. During the data transfer operation, the control unit (30) sets the “USB” signal, which is removed at the end of the transfer operation.

Through the RS-232 interface controller (34), the network power quality control unit can be included in an external monitoring and control system.

Claims (4)

1. Network block quality control of power supply, containing converters of the input signal into a digital code, the outputs of which are connected to the inputs of the registers of temporary storage of data, the outputs of which are connected to the inputs of the multi-limit signal comparison unit with a reference value, the output of which is connected to the input of the control unit, the output of which is connected with an input of an indication unit, characterized in that a measurement unit of a battery voltage is inserted into it, the output of which is connected to an accident detection circuit, a measurement unit frequency frequency of the sinusoidal voltage, comprising a level matcher, a frequency reference driver, a level comparator, a sampling interval adjuster, a timer counter, a comparison circuit with a reference value, a memory controller unit, made in the form of a controller that provides communication with external devices via the RS- interface 232, to the USB interface, writing to an external memory module, the input of which is also connected to the output of the control unit, the output of which is also connected to the inputs of the USB interface controller and RS-2 interface controller 32. 2. The power supply quality control network block according to claim 1, characterized in that the battery voltage measuring unit is made in the form of max and min level voltage shapers connected to the inputs of two comparators of voltage limit levels at the lower and upper boundaries connected to the detection circuit battery failures connected to the memory controller and the input of the control unit. 3. The power supply quality control network block according to claim 1, characterized in that the control unit is made in the form of a microcontroller having control outputs to a comparison circuit with a reference value for measuring the frequency of a sinusoidal voltage, a memory write controller, a USB interface controller, an RS- interface controller 232, an indication unit and inputs connected to the outputs of the multi-limit signal comparison unit with a reference value. 4. The power supply quality control network block according to claim 1, characterized in that the display unit is made in the form of a panel of single indicators.