UA64352A - Short circuit indicator with memory - Google Patents

Abstract

The proposed short circuit indicator with memory contains a short-circuit current transducer, a voltage transducer, a threshold unit with a storage element, and additionally, a transmit-receive antenna, a switch for selecting signal reception or transmission mode, a signal transmitter, an address check unit, a unit for processing response signals, a modulator, and a power amplifier. The outputs of the short-circuit current transducer and the voltage transducer are connected to the corresponding inputs of the threshold unit, which output is connected to the first input of the switch via the modulator, power amplifier, and signal transmitter that are connected in series. The second input and the first output of the switch are connected to the transmit-receive antenna. The input of the unit for processing response signals is connected to the second output of the switch via the signal receiver and the address check unit that are connected in series.

Description

Description of the invention

The invention relates to electrical measuring equipment, in particular to devices that allow finding a damaged section of a branched power transmission line with an isolated neutral in the event of a short circuit.

A well-known UPU-type short-circuit indicator (see V.A. Borukhman, A.A. Kudryavtsev, A.P. Kuznetsov.

Devices for determining places of damage on overhead power lines. M. "Znergiya", 1980, 104 p.), consisting of a stationary unit containing a magnetic current sensor, a logic unit, a voltage control element, a contact socket and a portable unit with a contact plug. 70 The disadvantage of the specified device is the presence of two blocks - stationary and portable, and the need to determine the fact of a short circuit only at the point of installation of the pointer.

The closest to the expected is the short-circuit indicator (see AS USSR Mo1780059, kl. 501K31/08), which includes the first and second induction sensors, the outputs of which are connected, respectively, to the inputs of the first and second comparators, the outputs of which connected respectively to the first and second inputs of the element

OR-NOT, the output of which is connected to the K-input of the flip-flop, the inverse output of which is connected to the first input of the element

And, the output of which is connected to the first terminal of the CS-circuit for time delay, the second terminal of which is connected to the first terminal of the transistor inverter, the second terminal of which is connected to the third terminal of the CS-circuit for time delay with a common bus, the third terminal of the transistor inverter is connected to the 5-input of the trigger directly and through a resistor with the positive power bus, the output of the voltage sensor is connected to the second input of the element I, and the LED indicator is connected to the direct output of the trigger and the mass power bus, respectively.

A significant drawback of this device is the need to fix the fact of a short circuit only visually by the light signal of the LED.

In addition, the device emits a light signal from the moment of a short circuit to the moment of re-supply of voltage to the line after its repair, even when the need for such a signal does not arise. "

The purpose of the invention is to determine the damaged section of a branched power transmission line with an isolated neutral in the event of a short circuit from the control room by determining a unique address for sending the repair team.

The goal is achieved by the fact that the short-circuit arrester, which includes an induction sensor with a short-circuit current and a voltage sensor, which are connected to a threshold body with a memory element, is additionally equipped with a receiving-transmitting antenna and a switch, receiving/transmitting ", by the receiver, the address and addressee verification unit, the reply packet formation unit", the modulator, the power amplifier, and the threshold body with the memory element is connected to the reply packet formation unit, "And which is sequentially through the modulator and the power amplifier connected to the receiving and transmitting antenna and

With the "receive/transmit" switch, which through the receiver and address and addressee verification block is connected to the response packet formation block.

The proposed invention has the following significant differences: control of the fact of a short circuit in the line using an induction current sensor, a voltage sensor and a threshold organ with a memory element and issuing a "coded signal taking into account the contents of the memory after a request from the control center using a C 70 radio signal through the receiving-transmitting antenna, the "reception/transmission" switch, the receiver, the block for checking the address and addressee from the block for forming the reply packet, through the modulator, the power amplifier and

With" switch "receive/transmit".

The drawing (Fig.) shows the functional scheme of the short-circuit arrester.

The scheme includes an inductive short-circuit current sensor 1, a voltage sensor 2, a threshold organ with 42 memory elements 3, a receiving-transmitting antenna 4, a "receive/transmit" switch 5, a receiver 6, a block

Address and addressee verification device 7, response packet formation unit 8, modulator 9, and power amplifier "IZ" 10.

The short circuit breaker works like this. o In the absence of damage on the line, the induction short-circuit current sensor 1 emits a low-level sl 20 signal, and the voltage sensor 2 - a high-level signal, which corresponds to the absence of a short circuit on the line, and this fact is recorded in the memory of the threshold body 3. After receiving the information of the "request" package from the control center through the receiving-transmitting antenna 4, the "receiving/transmitting" switch 5, and the receiver 6, in block 7 the address and addressee are checked.

When identifying the correctness of the address, a command is given to the "reply" packet formation block 8, information 29 from which, taking into account the contents of the memory block, through the modulator 9, the power amplifier 10, the "reception/transmission" switch is transmitted to the air through the receiving-transmitting antenna.

The control center receives information about the absence of damage on the line.

When an interphase short circuit occurs on the line, a high-level signal is sent from the induction current sensor 1, which activates the operation of the threshold organ with the memory element 3. The fact of damage to the line 60 is memorized by the latch.

After disconnecting the damaged line by relay protection, the information about the flow of high current through the wires remains in the memory of the latch.

In this state, the lock will be in place until the voltage in the damaged line is restored.

If at this time a request is sent from the control room, then through the receiving and transmitting antenna 4, because the "receive/transmit" switch 5 and the receiver b in block 7, the address and addressee are checked. When identifying the correctness of the address, a command is sent to the block for forming the response packet. 8, information from which, taking into account the contents of the memory block Z, about damage to the line through the modulator 9, the power amplifier 10, the "receive/transmit" switch 5 and the receiving-transmitting antenna 4 is transmitted to the air.

The control center receives information about damage to the line.

After restoring the voltage on the line with the help of voltage sensor 2, the information confirming the restoration of the line's operability is restored in memory C.

The proposed short-circuit arrester device, due to the removal of the need for continuous operation after the occurrence of a short circuit and the possibility of issuing a signal about the state of the line only after a request from the 7/0 dispatch center, has greater informativeness, and also allows to reduce the costs of operational services, since the need for a visual inspection is eliminated.

Sources. 1. V.A. Borukhman, A.A. Kudryavtsev, A.P. Kuznetsov. Devices for determining places of damage on overhead power lines. M.: Znergia, 1980, 104p. 2. Short circuit indicator: A.s. 1780059 USSR, MKI (301K31/08 /V.M. Zubko, V.A. Korobka,

N.M. Cheremisyn, V.I. Kazak, I.M. Trunova (USSR). - Mo4884538/21; Announced on November 22, 1990; Publ. 07.12.92, Bull. Mo45.

Claims (1)

The formula of the invention is a short-circuit arrester, which includes an inductive short-circuit current sensor and a voltage sensor, which are connected to a threshold body with a memory element, which is characterized by the fact that it includes a receiving-transmitting antenna, a receiving/transmitting switch ", receiver, address and addressee verification unit, response packet formation unit", modulator and power amplifier, and the threshold body with a memory element is connected to the receiving and transmitting antenna and the "response" packet formation unit, which is sequentially through the modulator and the power amplifier is connected to the receiving-transmitting antenna and the "receive/transmit" switch, which through the receiver and address and addressee verification unit is connected to the response packet forming unit. - and? (o) sh" (95) 1 Ko) 60 b5