RU198991U1 - NON-INVASIVE DEVICE FOR REMOTE CONVERSION OF CURRENT AND VOLTAGE IN A HIGH-VOLTAGE NETWORK - Google Patents

Abstract

The utility model relates to high-voltage electric power industry and can be used for remote conversion of currents and voltages in high-voltage electric networks for their subsequent measurement. A non-invasive device for converting current and voltage in a high-voltage network consists of a current transformer with a magnetic gap of a magnetic circuit, a capacitor of a low-voltage arm of a capacitive voltage divider, a capacitor of a high-voltage arm of a voltage divider, a capacitor for power take-off, a power supply unit, an analog-to-digital converter of converted voltage, an analog digital converter of converted current, voltage transceiver, current transceiver, signal processing terminal. A physically non-invasive device for converting current and voltage in a high-voltage network consists of a case, inside which is a current transformer with a magnetic gap of the magnetic circuit, a capacitor for a low-voltage arm of a capacitive voltage divider, a capacitor for power take-off, a power supply, analog-to-digital converters, wireless transceivers (transmitting part), and connected to the case of the capacitor of the high-voltage arm of the voltage divider and separately a transceiver (receiving part) with a signal processing terminal. The essence of the changes in the known device is revealed, as a result of which - the wire break with the measured current is eliminated, the place is not prepared for the installation of the device, the current and voltage are measured regardless of the flowing current. The technical result solved by the utility model is the creation of a non-invasive device for remote conversion of current and voltage in a high-voltage network, with the possibility of quick installation and dismantling, including without removing the voltage from the line. 2 fig.

Description

The utility model relates to high-voltage electric power industry and can be used for remote precise conversion of currents and voltages in high-voltage electric networks for their subsequent measurement.

The utility model relates to high voltage electrical equipment, and is intended for large-scale conversion of electrical parameters to values suitable for subsequent measurement with standard low voltage electrical measuring instruments.

Electrical equipment designed to convert the parameters of electrical circuits in high voltage networks are currently known classical electromagnetic current and voltage transformers, as well as voltage dividers, Rogowski coils, Hall sensors, other current and voltage converters based on a change in the polarization of the light flux, passing through a certain substance, or based on other measurement principles, are described in the following sources:

1. Barzilovich VM High-voltage current transformers. L .: "Gosenergoizdat", 1962;

2. Bachurin NI Current transformers. L .: "Energy", 1964;

3. Vavin V. N. Current transformers. M .: "Energy", 1966;

4. Adonyev N.M., Afanasyev V.V., Karpenko L.N. High voltage optoelectronic transformer. // Electricity, 1969, no. 11;

5. Afanasyev V.V., Zubkov V.P., Krastina A.D. Optoelectronic current transformers. // Electricity, 1970, No. 7, pp. 18-24.

6. Adonyev N.M., Afanasyev V.V., Zhalalis L.V. Opto-electronic current transformer for 750 kV with direct modulation of the luminous flux. // Electrical industry. High voltage devices, transformers, power capacitors. 1972, No. 6 (15), pages 19, 20;

7. Afanasyev V.V., Zubkov V.P., Krastina A.D. Optical current transformers for EHV systems. // Electricity, 1975, No. 6, pp. 21-30.

8. Vavin VN Voltage transformers and their secondary circuits. 2nd ed. -M .: "Energy", 1977;

9. Afanasyev V.V., Adonyev N.M., Kibel V.M. and other current transformers. 2nd ed., L .: Energoatomizdat, 1989, pp. 343-380;

10. USSR author's certificate for invention No. 390457 "Device for measuring current in high-voltage circuits" with a priority of 13.04.1971;

11. USSR author's certificate for invention No. 646261 "Optoelectronic voltage transformer" with priority from 10.10.1977;

12. Patent of the Russian Federation for invention No. 2346285 "High-voltage optoelectronic device for measuring current", with priority from 05.09.2007;

13. Patent of the Russian Federation for invention No. 2368906 "High-voltage digital device for measuring current", with a priority of 05.09.2007;

14. Patent of the Russian Federation for invention No. 2365922 "Optoelectronic current sensor", with priority from 07.04.2008;

15. Patent of the Russian Federation for a useful model No. 100284 "Device for measuring and processing electrical quantities in circuits with complete galvanic isolation", with a priority of 30.07.2010;

16. Patent of the Russian Federation for a useful model No. 2516034 "Device for measuring current and voltage in a high-voltage network", with a priority of 08.10.2012;

17. Patent of the Russian Federation for invention No. 2564124 "Complex for remote monitoring of currents and voltages", with a priority of 04.09.2014;

18. Patent of the Russian Federation for a useful model No. 2608335 "Optoelectronic current and voltage sensor", with a priority of 29.04.2015;

19. Open technical data of measuring transducers, serially produced by JSC "Profotech" (link on the Internet https://www.profotech.ru/products/index.php);

20. Open technical data of measuring transducers, mass-produced, by Arteche Corporation (link on the Internet https://www.arteche.com/en/products/optical-current-transformer);

21. Serially produced by I-Tor LLC, link on the Internet: http://i-tor.ru/index.php/o-produkte-i-tor/dlya-setej-35-kv/konstruktsiya-i -tor-35.

All currently known classical electromagnetic devices for large-scale transformation of high-voltage network parameters are stationary devices installed at substations, on additional supports (sources 8, 9), or suspended on power lines (source 21). Most of the known devices for accurate current conversion require cutting a wire with current (sources 8, 9, 19-21), which entails additional costs for their installation. Most of the known devices require for the transmission of directly converted signals an electrical communication line (sources 8, 9), or an optical communication line (sources 14 - 21) for the transmission of encoded information about the converted values. These reasons do not allow installing devices for measuring current and voltage in a high-voltage network without disconnecting it from power, and quickly adjusting the conversion of high-voltage network parameters to measure them.

The closest analogue of the patentable utility model is a prototype according to source 17. This device contains a control terminal connected by a data transmission channel with a group of recorders, each of which contains a current sensor in the form of a resistor shunt installed in the break of a phase wire of a high-voltage network, a voltage sensor in the form of a divider voltage, the low-resistance arm of which is connected to the corresponding resistor shunt, and the high-resistance one is built into the hollow insulator and grounded, and the primary processing module, in the shielding case of which, galvanically connected to the monitored point of the network, the power supply is located, the first and second analog-to-digital converters, coupled with current and voltage sensors, respectively, a control unit to which the start inputs and outputs of analog-to-digital converters are connected, while the control unit of each recorder is equipped with an accurate time sensor, a wireless transceiver connected to the specified channel data transmission, and is configured to simultaneously start analog-to-digital converters, accompanying the measured digital values of current and voltage with timestamps, storing the received data and transmitting it through a wireless transceiver, the terminal is configured to receive and jointly process data received from the recorders, and complex - with the ability to change the operating mode of the recorders by the commands of the control terminal.

The disadvantage of the prototype for source 17 is the requirement to break the phase wire for current conversion, the presence of a hollow insulator and, accordingly, the requirement for a place for its installation, as well as a complex data transfer structure, in particular, the maintenance of data on the converted values with time stamps, storage of data with time stamps up to their transmission over the radio channel. In addition, the power supply of the entire electronic part located in the vicinity of the high voltage wire is carried out from the flowing current, and if it is lost, it will be impossible to convert the voltage.

The problem solved by the utility model is to eliminate the break in the wire with the measured current, to eliminate the preparation of the site for the installation of the device, to ensure constant measurement of current and voltage regardless of the current flowing.

The technical result solved by the utility model is the creation of a non-invasive device for remote accurate conversion of current and voltage in a high voltage network, with the possibility of its quick installation and dismantling, including without removing the voltage from the line.

To achieve the technical result, the original prototype is performed with a current sensor in the form of a current transformer, which has a magnetic gap of the magnetic circuit for free placement of the high-voltage network wire in its window, and has a stable load of the secondary winding (for accurate conversion in the entire range of measured currents). To eliminate the dependence of the operation of the device on the passing current, not a high-resistance voltage divider is used to measure the voltage, but a capacitive one, which, in addition to direct voltage conversion, also performs the function of powering the entire electronic part by increasing the current through the high-voltage arm. For quick installation and dismantling, a high-voltage capacitor with a minimum current (and, accordingly, capacity, weight, dimensions) is used as a high-voltage arm of a capacitive divider, but for this a technical conflict arises - insufficient power supply of the electronic part located near the high-potential wire may occur, for which, in the original prototype, control units and precise time sensors are eliminated, which have high energy consumption due to excessive signal processing and data storage. The converted current (using a current transformer with a gap) and voltage (using a capacitive voltage divider), identical to the prototype, will be transmitted through analog-to-digital converters and wireless transceivers to the terminal in real time, and, after restoration and correction of signals, to the processing complex.

The utility model is illustrated by a drawing, where figure 1 shows a sketch of a non-invasive device for remote conversion of current and voltage in a high voltage network. In the figure, the numbers indicate:

1 - A wire or cable of a high-voltage network, which is under high voltage;

2 - a current transformer with a magnetic gap of the magnetic circuit;

3 - Capacitor of the low-voltage arm of the capacitive voltage divider;

4 - Capacitor of the high-voltage arm of the voltage divider (high-voltage capacitor);

5 - Condenser for power take-off;

6 - Power supply unit;

7 - Analog-to-digital converter of converted voltage;

8 - Analog-to-digital converter of converted current;

9 - Voltage transceiver (transmitting part);

10 - current transceiver (transmitting part);

11 - Transceiver (receiving part);

12 - Signal processing terminal;

13 - Signal processing complex.

The patented device works as follows. When the measured current flows through the wire or cable 1 through a current transformer having a magnetic gap of the magnetic circuit 2, a current proportional to the primary one arises in its secondary winding. If such a transformer has a strictly defined load, then it is possible to achieve a very accurate current conversion, including the phase error (research performed in source 9). The voltage from the high-voltage wire is fed to the voltage divider formed by the power take-off capacitor 5, the low-voltage arm capacitor 3, the high-voltage arm capacitor 4. To ensure accurate voltage conversion and take off the required power, it is necessary that the parameters of the capacitors, as well as the capacitor loads, are strictly coordinated that is achieved by correct calculation of the divider arms. One of the main parameters in the calculation is the minimum capacitance of the capacitor of the high-voltage arm 4, in order to reduce its weight and dimensions. Converted current and voltage, having minimal conversion errors, as in the prototype, are fed to analog-to-digital converters 8 (for converted current) and 9 (for converted voltage), but unlike the prototype, digital-to-analog converters operate in real time, without time stamping and data storage. The digital code through the wireless current transceiver 9 and the wireless voltage transceiver 10, with the receiving part 11, transmit the signal to the terminal 12. At the terminal 12, the signals are restored from digital form to the form necessary for further measurement or processing, and is transmitted to the signal processing complex 13. Recovery of signals in the terminal is performed with a time shift to ensure the accuracy of phase conversion of current and voltage. Due to the fact that for analog-to-digital converters and wireless transceivers, the time shift does not change with the frequency and magnitude of the transmitted signals, for a high voltage power network, it will be enough to introduce a phase delay calculated for the main frequency of the network (calculations and tests for source 9). Signal processing complex 13 will receive converted signals of current and voltage with minimal errors in magnitude and phase.

The physical structure of the patentable device is shown in figure 2, where the numbers indicate:

1 - Wire or cable of a high-voltage network under high voltage;

2 - the case, inside of which there is a current transformer having a magnetic gap of a magnetic circuit, a capacitor of a low-voltage arm of a capacitive voltage divider, a capacitor for power take-off, a power supply, analog-to-digital converters, wireless transceivers (transmitting part);

3 - Capacitor of the high-voltage arm of the voltage divider (high-voltage capacitor), figure 2 is conventionally shown as a set of several series-connected capacitors;

4 - Transceiver (receiving part) with a signal processing terminal.

In such a physical arrangement, the device can be put on a high-voltage wire using high-voltage rods or a flying drone on any part of the high-voltage network, the capacitor of the high-voltage arm of the voltage divider can be grounded on any surface with standard ground electrodes, the minimum current consumption from the high potential (about 15 20 mA, calculations in the source 4) will allow removing the device without arcing, and wireless transmission will make it possible to do without building physical communication lines, and the transceiver (receiving part) with the signal processing terminal can be located at a sufficient distance from the line with the measured current and voltage ... The problem solved by the utility model has been achieved - the wire break with the measured current has been eliminated, preparation for installing the device is not required, constant measurement of current and voltage regardless of the current flowing.

The technical result solved by the utility model has been achieved - a non-invasive device has been created for remote conversion of current and voltage in a high-voltage network, with the possibility of its quick installation and dismantling, including without removing the voltage from the line.

Claims (1)

A non-invasive device for remote conversion of current and voltage in a high-voltage network, containing a signal processing terminal, a transceiver for transmitting information about the converted values of current and voltage, analog-to-digital converters of converted current and voltage, characterized in that a current transformer having a magnetic the gap of the magnetic circuit for free placement in its window of the high-voltage network wires, for voltage measurement - a capacitive voltage divider, which, in addition to voltage conversion, serves as a power supply for analog-to-digital converters and wireless transceivers, conversion and transmission of converted current and voltage is carried out to the terminal in real time, and the device itself is made in the form of a single module, worn on top of the high-voltage wire and connected to the ground by the high-voltage arm of the capacitive voltage divider, the lower side of which is grounded.

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