RU137392U1 - DEVICE FOR MONITORING THUNDER-SPEED VOLTAGES ON THE HIGH-VOLTAGE ELECTRIC TRANSMISSION ROUTE - Google Patents

Abstract

1. A device for monitoring overvoltages on the overhead power line, containing lightning surge detectors installed on both ends of the monitored line, each of which is equipped with an accurate time signal receiver and is connected by an input to a lightning surge sensor, while lightning surge sensors are made in the form of current transformers in circuits connecting filters connecting technological RF coupling to isolation capacitors, lightning surge recorders are interconnected information channel and configured to fix the values of the current time and record with digitization of the output signal of the corresponding sensor when this signal exceeds a predetermined threshold and data exchange through the information channel with another registrar, at least one of the registrars or additionally connected to it digital processing is performed with the possibility of calculating the difference recorded by the registrars of the current time values and determining from the calculated difference one hundred overvoltage on the line. 2. The device according to claim 1, in which the sensors of lightning overvoltage are made in the form of a Rogowski belt, covering the connection circuit of the filter connecting the RF coupling to the isolation capacitor.

Description

Technical field

The utility model relates to the electric power industry and can be used to quickly obtain information about thunderstorm conditions and the intensity of thunderstorm activity on the route of a high-voltage overhead power transmission line (VL).

State of the art

A device for monitoring lightning surges in power lines, which contains a controller, a serially connected current transformer and a three-channel ADC, a voltage sensor, a storage device, a radio frequency transceiver, a comparator and a peak detector [RU 1119122 op. 08/10/2012]. This device is adopted as a prototype.

In the prototype device, electrical disturbances of phase currents exceeding a predetermined threshold serve as recorded and measured quantities. Because of this, the results of monitoring lightning overvoltages depend on the line mode, which results in their low information content and reliability. In addition, the information content of monitoring is reduced in the prototype due to the fact that it does not determine the location of the lightning impact on the route of the power line.

Utility Model Creature

The technical result of the utility model is to increase the information content and reliability of data on thunderstorm conditions on the overhead line.

The subject of the utility model is a device for monitoring lightning surges on the overhead power line, containing lightning surge detectors installed on both ends of the monitored line, each of which is equipped with an accurate time signal receiver and is connected to the lightning surge sensor by the input, while lightning surge detectors are made in in the form of current transformers in the connection circuits of the filters for connecting the technological RF connection to the isolation capacitors, register Lightning overvoltages are interconnected by an information channel and configured to record the current time and record with digitization of the output signal of the corresponding sensor when this signal exceeds a predetermined threshold and data exchange through the information channel with another registrar, at least one of the registrars or an additional digital processing facility connected to it is configured to calculate the difference between the values recorded by the registrars of the current belts and definitions from the calculated difference of the place of occurrence of overvoltage on the line.

This allows you to get the specified technical result.

The utility model has a development consisting in the fact that

- current sensors are made in the form of a Rogowski belt, covering the connection circuit of the filter connecting the RF coupling to the isolation capacitor;

Implementation of a utility model, taking into account its developments

Figure 1 illustrates the structure and operation of the proposed device.

The figure shows the registrars 1 and 2 of lightning surges installed at both ends of an overhead power line 3. Registrars 1 and 2 are equipped with receivers of accurate time signals from the satellite navigation system (OP8 and / or Glonass) with antennas 4 and 5, respectively. The inputs of the registrars 1 and 2 are connected to the sensors 6 and 7 of the lightning surge. Registrars 1 and 2 are interconnected by an information channel (for example, a radio channel) 8.

Sensors 6 and 7 are made in the form of current transformers in the connection circuits of the filters 9 and 10 of the RF connection to the isolation capacitors 11 and 12, respectively. Registrars 1 and 2 are made with the possibility of fixing the current time and recording with digitization of the output signal of the sensor 6 or 7, respectively, when this signal exceeds a predetermined threshold. Each registrar is configured to exchange data through an information channel with another registrar. One of the registrars or an additional digital processing facility (not shown in the drawing) connected to it is configured to calculate the difference between the values recorded by the registrars 1 and 2 of the current time and determine from the calculated difference the location of the overvoltage on line 3.

As current transformers in sensors 6 and 7, Rogowski belts are used, covering the connection circuit of filters 9 and 10 to isolation capacitors 11 and 12, respectively;

The monitoring device operates as follows.

Through antennas 4, 5 and corresponding receivers, the exact time signals from one of the satellites of the OP8 and / or Glonass systems are received at the registrars 1 and 2.

In the absence of lightning overvoltages, the currents through the capacitors 11 and 12 induce signals at the outputs of the sensors 6 and 7, the value of which does not exceed the set thresholds of the registrars 1 and 2.

When a lightning overvoltage occurs on the overhead line, its front propagates to both ends of line 3. When the overvoltage front reaches the end of the line on which the sensor 6 is installed, the current flowing from the wire of line 3 through the capacitor 11 and filter 9 induces at the output of the sensor 6 a signal that exceeds a predetermined threshold of recorder 1. When the threshold is exceeded, recorder 1 captures the exact time value received by the corresponding receiver, then converts the signal of sensor 6 into a digital form and generates a file containing the corresponding the corresponding time stamp and digitized signal values from the sensor 6. This file is transmitted via channel 8 to recorder 2, which formed a similar file with a time stamp corresponding to the moment of recording of the overvoltage front at the other end of line 3. from recorder 2.

If the difference in the received time stamps is less than the known propagation time of the signal from one end of the line to the other, the recorder 2 records this overvoltage as a lightning overvoltage that occurred on the line 3 path and calculates the place of its occurrence based on the difference of the time stamps. According to the received signal values, the recorder 2 (or the digital processing facility connected to it) determines and stores in memory the overvoltage parameters in accordance with the requirements for monitoring.

If the difference in the obtained time stamps exceeds the known propagation time of the signal from one end of the line to the other, the recorder 2 determines this overvoltage as external to the monitored line 3.

Claims (2)

1. A device for monitoring overvoltages on the overhead power line, containing lightning surge detectors installed on both ends of the monitored line, each of which is equipped with an accurate time signal receiver and is connected by an input to a lightning surge sensor, while lightning surge sensors are made in the form of current transformers in circuits connecting filters connecting technological RF coupling to isolation capacitors, lightning surge recorders are interconnected information channel and configured to fix the values of the current time and record with digitization of the output signal of the corresponding sensor when this signal exceeds a predetermined threshold and data exchange through the information channel with another registrar, at least one of the registrars or additionally connected to it digital processing is performed with the possibility of calculating the difference recorded by the registrars of the current time values and determining from the calculated difference hundred occurrence of overvoltage on the line. 2. The device according to claim 1, in which the sensors of lightning surge are made in the form of a Rogowski belt, covering the connection circuit of the filter connecting the RF coupling to the isolation capacitor.

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