SU1580489A1 - Automatic circuit recloser with check of insulation level in no-current condition pause - Google Patents

Abstract

The invention relates to electrical engineering, to electrical network automation devices. The goal is to increase the reliability of the device. Through an attachment unit consisting of two high-voltage herkotrons with control locking and opening contacts into the dead time of the automatic recloser, a high voltage is supplied to the two phases of the line. The current in this circuit is measured by a herkotron consisting of two reed switches with different sensitivity, the closing and opening contacts of which are connected in series with each other and are included in the power supply circuit of the relay controlling the switching of the dry contacts to other phases, if the insulation of the previous connection phases is satisfactory, and switching on the reclosing relay after satisfactory isolation of all phases. The device detects a phase failure of the line and interphase closure. 1 il.

Description

The invention relates to electrical engineering, specifically to electrical grid automation devices.

The aim of the invention is to increase the reliability of the device.

The drawing shows the electrical circuit of the device.,

An automatic reclosing device with a control of the isolation level during a blank pause contains a block 1 for connecting to the wires of the power line 2, a block 3 for controlling the isolation level, a high voltage source 4 with a control block 5 for

The connection unit 1 contains high voltage reed relays (dry cell) 6-8 with reed switches 9-11, coils 12-14 of control and high voltage

insulation 15-17 between the reed switches and control coils The control coils 14 are connected to the operating current source directly. Two contacts of each of the switching reed switches 9 and 10 are connected to the phases of line 2, and the average terminals of these switches are interconnected through a high voltage winding source 4, which was used as a transformer NOM-17, a resistor 18, to which through a rectifier 19 by means of a reed switch 11 a herkotron 8 connects to the katuac 20 a control of a herkotron 21 with a KS chain 22 and 23 The herkotron 21 is equipped with two gerk contact 24 and 25, which have to independently control actuation threshold yiem and separated v

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from the excitation coil 20 by high-voltage insulation 26. The reed switch 24 adjusts itself to greater sensitivity than the reed contacts 25, the closing contacts of the reed switch 24 and the disconnecting contacts of the reed switch 25 are connected in series and connected to the power supply of three intermediate relays 27-29, the last two of which made with a delay (RC circuits 30, 31 and 32, 33) Relays 27-29 are included in the circuit so that the first closing contact 34 of the relay 27 is located in the power supply circuit of the coil of the relay 28, the first closing contact 35 of the relay 28 is in the power supply circuit coil relays 29 and pin 36 relays 29 - in the power supply circuit of the switch actuator reclosing relay (RPV). The second make contacts 37, and 38, respectively, relays 27 and 28 are included in the power supply circuit of coils 12 and 13 of the control unit of the connection unit.

The control unit 5 of the high voltage source 4 voltage contains two block contacts 39 and 40 of the high voltage switch and two intermediate relays 41 and 42 with delays (RC circuits 43, 44 and 45.46). A third short circuit is connected to the power circuit of the relay 41 contact 47 of the relay 27, and the third closing contact 48 of relay 28 is turned on in the power supply circuit of the relay 42. In the power supply circuit of the low-voltage coil of the source 4, apart from the block contacts 39 and 40 of the high-voltage switch, the breaking contact 49 of the relay 27, breaking contact 50 of the relay 28, closing contact 51 of the relay 41 and closing contact 52 of the relay 42, which are interconnected in pairs and parallel "

The device works as follows.

A high-voltage circuit breaker disconnects at the command of the relay protection — line 2, with its block contacts 39 and 40 connects to the operating current source the low-voltage winding of high voltage source 4 (transformer HOM-17) and coil 14 of the hercron 8 control, which triggers the reed switch 11 and the connection to the line 2 of the measuring unit 3. If necessary, the power from the operating current source can be supplied to the device with a time delay. High voltage from the source 4 through the connecting unit is fed into one pair Phase of the line 2 "The magnitude of the current flowing at this moment in the terminal

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a pair of rotated, fixed by the reed switch 21 of the measuring unit 3 "If there is no insulation damage in this pair, then in the coil 20 of the control of the herkotron 21 a current of such magnitude flows that is sufficient to operate only the reed switch 24 and not enough to operate the rep-cock 25, which is accompanied by the supply of voltage from the source of operating current to the power supply circuit of the intermediate body 27 "Relay 27, receiving power, performs the following operations: contact 49 breaks the power supply circuit of the source 4; contact 37 provides power to coil 12 for controlling herkotron 6, thereby triggering reed switch 9 and switching source 4 to the next pair of phases; contact 47 connects the relay 41, which again contacts source 4 with its contact 51; contact 34 connects the relay to 28o. If no insulation damage is detected in this pair of phases, then relay 28 will receive power and perform similar operations after time set by the KS circuit 30, 31: contact 50 will break the power supply circuit of source 4; contact 38 will connect the coil 13 of the control of the herkotron 17 and the reed switch 10 will switch the source 4 to the next pair of phases; contact 48 will energize relay 42, which by its contact 52 will restore the power supply circuit of source A; contact 35 closes the power supply circuit of the relay 29. If the isolation condition is satisfactory in the last pair of phases, then the relay 28, with the contact 36, will give a signal to activate the switch actuating relay

The reclose prohibition signal is generated both in the case of a decrease in resistance between the controlled bases (with a short circuit, an increased value of the current in the monitored circuit is fixed, which causes the contact of the reed switch 24 to close and the contact of the reed switch 25 opens) (if the phase conductor breaks the current in the controlled circuit, below the value that is necessary to close the contacts of the reed switch 24).

The indicated line faults are fixed by the device, the reed switch circuit 24 and 25 is broken, disconnecting from the operational power source intermediate relays 27-29, which is accompanied by

prohibiting auto-reclosing and returning the device to its original state.

Thus, the proposed automatic reclosing device with isolation level control in a current-free pause provides increased reliability by eliminating the possibility of switching on the high-voltage switch for an unresponsive short circuit.

Claims (1)

Invention Formula An automatic reclosing unit with control of the isolation level in a current-free pause of the transmission line with a switch containing a source of operating current, a high-voltage rectifier, a terminal block greater sensitivity, and. the reed contacts of the reed switch configured for lower sensitivity are interconnected in series and on In the power supply of three intermediate relays of the insulation control unit, the second and third of which are made with a KS-delay, the first closing the contact of the first intermediate relay is connected to the power supply circuit of the second intermediate relay, the second to the power supply circuit of the control coil of the first hermetic switch of the connection unit, the third to the power supply circuit of the coil of the first intermediate relay of the control unit of a high voltage source of voltage, the first break contact of this relay is included in the power supply circuit of the low voltage circuit connect to the wires of the power line-20 coils of voltage transformer from cottages and isolation control unit, characterized in that, in order to increase the reliability of the device, it is equipped with a high-voltage source, made in the form of a single-phase voltage transformer and its control unit, consisting of two intermediate relays with an RC circuit, the attachment unit is made in the form of two high-voltage herkotrons, the breakers of which are connected to the opposite phases of the line, one closing to the third phase, the other to one of the two first phases of the line, and the middle leads are interconnected through High-voltage winding of a transformer and a resistor, in parallel to which through a rectifier by means of a closing magnetically controlled end the cycle of the third herkotron of the block of the relay relays of the block of control of isolation, in unit, the control coil of which is connected to the source of the operating current, is connected to the control coil of the herkotron of the insulation control unit, equipped with two reed switches with control of the response threshold independent of each other, and the closing contacts of the reed switch configured to 50 five operating current source, the first closing contact of the second intermediate relay of the insulation control unit is included in the power supply circuit of the third intermediate relay of this unit, the second - in the power supply circuit of the coil of the second gerkotron of the connection unit, the third one - in the power supply circuit of the coil of the second intermediate relay of the control unit, the first break contact of this relay is in the low voltage winding power supply circuit in series with the first break contact of the first intermediate relay of the insulation control unit, the closing contacts of the first second and second intermediate relays of the control unit are connected in parallel with the opening contacts of the first and second intermediate respectively the power supply circuit of the low-voltage winding of the transformer is connected in series with the closing contacts of high-voltage switches, the closing contact of the third intermediate relay of the insulation control unit is connected to the power supply circuit of the reclosing relay ЈlSd5 | SYAT1 “LR 42ПЪ 27 P 25 J5 zg aS -fW 33 On RPT