RU2525581C1 - Electronic current and voltage sensor on high potential - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention refers to the field of electric measurement equipment and may be used to measure currents and voltages. An electronic current and voltage sensor on high potential comprises a metering module, a high-voltage current conductor connected to an analogue-digital converter. The supply inlet of the analogue-digital converter is connected with an accumulator by means of a power supply selection unit, and also with an optical source of power supply. The outlet of the voltage divider is connected to the inlet of the analogue-digital converter, the outlets of which are taken out from the metering module by means of optical channels. The voltage divider is fixed in a support insulator. In the metering module there are the following additional components: a voltage converter, connected to a low-voltage arm of the voltage divider. Optical channels are connected to a communication module, comprising a communication controller, a power supply unit, a pump module of a laser diode, an alarm unit. Also the device comprises an interface SPI.

EFFECT: increased stability of current and voltage measurement on high potential.

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Description

The invention relates to the field of electrical engineering and can be used to measure currents and voltages, in particular, at the objects of accounting and distribution of electrical energy instead of existing current and voltage transformers.

The prior art device for measuring alternating and pulsed currents in a power line, in which the output of the current sensor, made in the form of a Rogowski coil, is connected to the input of the device in an environmental housing that performs the functions of registration, as well as converting optical and electrical quantities, while the outputs of the housing through optical channels connected to the inputs of the monitoring and recording system, and the outputs of the monitoring and recording device are connected to a computer (US 4105966 A, 08/08/1978, G01R 13/04).

The disadvantages of the known device are insufficient measurement accuracy, low noise immunity, lack of elaboration of the design in the power transmission circuit and interfacing with existing devices for measuring, protecting, accounting for electricity, the inability to measure voltage.

The closest solution in technical essence and the achieved result is a technical solution for a current transformer combined with a capacitor of a high-voltage arm of a capacitive voltage divider, taken as a prototype, where a capacitive voltage divider is located inside the support insulator hermetically mounted on the metal base, and a measuring module is installed on top of the casing with a high-voltage conductor located inside and a current sensor, which is made in the form of an electromagnetic transformer current, and the conclusions from the voltage divider and current sensor are made in the form of conductors (RU 2297063 C2, 04/10/2007, H01F 38/00).

The disadvantages of this device are the analog output of the measured values, the nonlinear dependence of the output characteristics of the low-voltage current transformer, the presence of ripples in this signal.

The technical result of the claimed technical solution is to increase the stability of measuring current and voltage at high potential by stabilizing the linear dependence of the output characteristics of the current sensor, transmitting data via the SPI interface and transmitting the measured values in digital form with the possibility of signaling.

The specified technical result is achieved due to the fact that the electronic current and voltage sensor at high potential contains a current sensor, a voltage divider, a reference insulator and a measuring module, inside of which a high-voltage conductor with a current sensor is fixed, while the measuring module is mounted on a reference insulator, inside of which a voltage divider is located, and the conclusions from the measuring module are fixed inside the reference insulator, according to the invention it is also equipped with an additional current sensor, analog a digital converter, a power selection unit, a battery, an optical power source, a voltage converter and a communication module equipped with a fixed and interconnected communication controller, a power supply, a laser diode pump module and an alarm unit, while a power selection unit is fixed inside the measuring module, which connected to a battery and an optical power source, and an analog-to-digital converter, the power input of which is connected to the power selection unit, and the inputs are with current sensors and a voltage divider, and the voltage divider is made with the possibility of additional power supply through a voltage converter from the low-voltage section, and the input of the voltage converter is connected to a voltage divider and the output is with a power selection unit, in addition, the conclusions of the measuring module are made in in the form of optical channels and connected to a communication module with the ability to transmit data by synchronous serial interface SPI.

The communication module is preferably configured to be powered from a household network.

It is advisable to carry out a current sensor and an additional current sensor in the form of a Rogowski flat coil with different winding directions and a return wire in each of them.

The voltage divider can be made on the basis of film capacitors.

The claimed technical solution is illustrated by graphic materials, where:

- figure 1 shows a structural diagram of an electronic sensor of current and voltage at high potential

- figure 2 - design of an electronic sensor of current and voltage at high potential.

An electronic sensor of current and voltage at high potential contains a measuring module 1, inside which a high-voltage current lead 2 is fixed, which is equipped with a current sensor 3 and an additional current sensor 4, made, for example, in the form of Rogowski coils connected to an analog-to-digital converter 5. Power input an analog-to-digital converter is connected to the battery 6 by means of a power selection unit 7, as well as to an optical power source 8. The output of the voltage divider 9 is connected to the input of the analog-to-digital converter 5, the outputs of which are output from the measuring module 1 by means of optical channels 10, 11, 12. The voltage divider 9 is mounted in the supporting insulator 13. In the measuring module 1, a voltage converter 14 is additionally located, connected to low voltage arm of the voltage divider 9. The optical channels 10,11, 12 are connected to a communication module 15, inside which a communication controller 16 is fixed, the power input of which is connected to the power supply unit 17, a laser diode pump module 18, which is connected via the optical channels 10, 11, 12 to the power selection unit 7 , the output of the communication controller 16 is additionally connected to the signaling unit 19, and the outputs of the power supply unit 17 are connected to the laser diode pumping unit 18 and the signaling unit 19.

An electronic sensor of current and voltage at high potential works as follows.

In the initial state, power is supplied to the input of the power supply unit 17, from the outputs of which power is supplied to the communication controller 16, the laser diode pump module 18 and the signaling unit 19 of the communication module 15. In turn, the optical diode pump module 18 is supplied with power through the optical channel 12 a power source 8, which charges the battery 6 and the power of the analog-to-digital converter 5 through the power selection unit 7.

In the absence of current and voltage on the high-voltage conductor 2 and when power is supplied from the household network to the input of the power supply unit 17, the analog-to-digital converter 5 is in "sleep" mode with minimal power consumption, and analogue start commands are received from the communication controller 16 through the optical channel 10 -digital converter 5 together with synchronization commands in accordance with the synchronous serial interface SPI, and through the optical channel 11 zero values of current and voltage from analog-to-digital are transmitted of the transducer 5 to the communication controller 16 as part of the communication module 15. When voltage is applied to the high-voltage conductor 2 from the current sensor 3 and an additional current sensor 4, as well as from the output of the voltage divider 9, analog signals are transmitted to the input of the analog-to-digital converter 5, which are converted into digital optical signals and through an optical channel 11 are input to the communication controller 16 as part of the communication module 15, where the signals are converted, processed, stored issued in digital form. In the communication module 15, through the signaling unit 19, the measured values are visualized in the form of tables of the effective values of currents and voltages.

In the event of a power failure through the optical power channel 12 during the applied voltage to the high-voltage conductor 2, the power of the analog-to-digital converter 5 is provided from the low-voltage section of the voltage divider 9, which through the voltage converter 14 supplies power through the power selection unit 7 to charge the battery 6 and the analog digital converter 5.

In the event of a power failure through the optical power channel 12 at the time of absence of voltage on the high-voltage conductor 2, the power of the analog-to-digital converter 5 is provided from the battery 6.

Due to the presence of an additional current sensor 4, made, for example, similarly to the current sensor 3 in the form of a Rogowski coil, but with a different winding direction and the presence of a return wire in each of them, as well as through the use of a voltage divider based on film capacitors in solid insulation, the sensitivity increases sensors, their noise immunity.

Due to the use of a digital data transmission channel, the influence of electromagnetic radiation on signal cables is eliminated, which helps to increase the stability of the process of measuring currents and voltages.

In the event of dangerous overcurrents or overvoltages in the power system at the inputs of the analog-to-digital converter 5, radio-technical elements are provided for protecting signal circuits from overvoltages, while the current sensor 3, current sensor 4 and voltage divider 9 are able to withstand emergency operation of the power system for a given voltage class, at this electronic sensor of current and voltage at high potential through a digital channel transmits information about the accident and through the block 19 alarm informs about the state of energy Istemi visualizing alarms in the form of tables.

Due to the use of the SPI interface when organizing the exchange of data between the analog-to-digital converter 5 and the communication controller 16, the stability is increased and the completeness of data delivery with guaranteed delivery time is maintained.

Thus, the claimed combination of essential features set forth in the formula improves the stability of measuring current and voltage at high potential through the use of current sensors made, for example, in the form of Rogowski coils, with different winding directions and a return wire in each of them, a divider voltage, for example, based on film capacitors in solid insulation with linear dependencies of output characteristics, the use of a synchronous serial interface SPI, and also due to the rejection of transmitting measured values through conductors and organizing digital transmission with the possibility of signaling at the installation site of an electronic current and voltage sensor.

The analysis of the claimed technical solution for compliance with the conditions of patentability showed that the characteristics indicated in the formula are essential and interconnected with the formation of a stable combination of the necessary features unknown at the priority date from the prior art sufficient to obtain the required synergetic (super-total) technical result.

Thus, the above information indicates the fulfillment of the following set of conditions when using the claimed technical solution:

- an object embodying the claimed technical solution, when implemented, is intended for stable measurement of currents and voltages and can be used at metering and distribution facilities for electric energy instead of existing current and voltage transformers;

- for the claimed object in the form described in the independent claim, the possibility of its implementation using the methods and methods described above or known from the prior art on the priority date has been confirmed;

- the object embodying the claimed technical solution, when implemented, is able to ensure the achievement of the technical result perceived by the applicant.

Therefore, the claimed subject matter meets the requirements of the patentability conditions of “novelty”, “inventive step” and “industrial applicability” under applicable law.

Claims (4)

1. An electronic sensor of current and voltage at high potential, comprising a current sensor, a voltage divider, a reference insulator and a measuring module, inside which a high-voltage conductor with a current sensor is fixed, while the measuring module is mounted on a reference insulator, inside which a voltage divider is located, and the conclusions from the measuring module are fixed inside the reference insulator, characterized in that it is also equipped with an additional current sensor, analog-to-digital converter, power selection unit, batteries a generator, an optical power supply, a voltage converter and a communication module equipped with a fixed and interconnected communication controller, a power supply, a laser diode pump module and an alarm unit, while inside the measuring module, a power selection unit is connected, which is connected to the battery and the optical power source , and an analog-to-digital converter, the power input of which is connected to the power selection unit, and the inputs are with current sensors and a voltage divider, and the voltage isolator is capable of additional power take-off by means of a voltage converter from the low-voltage section, and the input of the voltage converter is connected to a voltage divider, and the output is connected to a power selection unit, in addition, the conclusions of the measuring module are made in the form of optical channels and are connected to the communication module with the possibility data transmission synchronous serial interface SPI. 2. The device according to claim 1, characterized in that the communication module is configured to be powered from a household network. 3. The device according to claim 1, characterized in that the current sensor and an additional current sensor are made in the form of a Rogowski flat coil with different winding directions and a return wire in each of them. 4. The device according to claim 1, characterized in that the voltage divider is made on the basis of film capacitors.

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