SU1203623A1 - Device for selecting faulted wire of electric power line with additional wire - Google Patents

Description

the power circuit of the winding of the second timer relay includes the time-delayed contacts of the first time relay, which closes with the time delay, the contacts of the second time relay, and the closing contacts of the first and second intermediate relays are included in the disconnection of the auxiliary wire separators F1

The invention relates to electrical engineering and is intended for relay protection and system automation of single-circuit power lines with one-sided power supply, supplied with $ 5. dotsolp-1TPr wire, in AC networks of high voltage from the receiving or intermediate substation.

The purpose of the invention is to improve the accuracy of determining the location of damage by detecting a damaged phase.

Fig. 1 is a schematic diagram of the proposed device; Fig. 2 shows an explanatory diagram of a receiving or intermediate substation powered from a transmission line with an additional wire at its one-sided power supply.

A device for selecting a damaged wire on a power line with an additional wire (FIG. Contains voltage relay 1 3, intermediate relays 4-7, power direction relay 8 and 9, time relay 10 and 11, and lock relay 12,

The winding circuit of the intermediate relay 4 includes a break contact 13 of the relay 1 voltage, shorting contacts 14 and 15 of the relay 2 and 3 voltage, respectively, as well as its own closing contacts 16.

In the winding of the intermediate relay 5, the closing contacts 17 and 18 of the relay and 2 voltages, respectively, the opening contacts 19 of the relay 3 voltage, as well as their own closing contacts 20,

03623

Cases in and the main wires of phases A and C, the closing contacts of the third and fourth intermediate relays are included in the disconnection of the main and auxiliary wires separators of phase B, the closing contacts of the first and second intermediate relays are included in the switch-on separators of the additional wires of phases A and C.

The power supply circuit of the windings of intermediate relays 6 and 7 includes closing contacts 21 and 22 of relay 1 and 3 voltages, respectively, opening contacts 23 of relay 2, shorting contacts 24 and 25 of relay 8 and 9 of power, voltage circuits of which are connected to the linear voltages of phases A and C, and the current circuits are connected to the current transformers 26 and 27 of the main and additional wires of phase 8.

The windings of the relay 6 and 7 are also connected to their own closing contacts 28 and 29, respectively.

The power circuit of the winding of the time relay 10 includes closing contacts 30 and 31 of intermediate relays 4 and 5.

In the power supply circuit of the winding of the relay 1 1 of the time relay of the lock 12, the contacts 32 of the time relay 10 and the closing contacts 33 - 35 of the relay 1 - 3 are connected with a time delay.

The windings of the intermediate relays 4-7 are connected to one of the poles of the power source via the disconnecting contacts 36 of the lockout relay 12.

The closing contacts 37 of the time relay 11 and the closing contacts 38 and 39 of the intermediate relays 4 and 5 are included in the circuit for disconnecting the separators of the main wire of phase A, the additional wire of phase B and the main wire of phase C and the additional wire of phase B, respectively.

The closing contacts 40 and 41 intermediate relays 4 and 5, respectively, with the block contacts 42 - 44 separators of the main wires of the phases

The a and c and additional wires of phase B are included in the connection circuit of the separators of the additional wires of phases A and C.

Closing contacts 45 and A6 for zhytkhygh; relays 6 and 7 are included in the disconnecting circuit for separators of the main and additional wires of phase 6.

The device is used at a receiving or intermediate substation, powered from overhead lines with an additional wire for its one-way power. The substation scheme is shown in FIG.

The main wires of the line have switching devices (for example, separators) 47 49, and an additional wire also has three switching devices (for example, a separator) 50 - 52.

In the normal operating mode, the auxiliary wire is connected in parallel to phase B, t, e. The separator 51 is switched on, and the separators 50 and 52 are disconnected. Current transformers 26 and 27 and voltage transformer 53 are installed at the substation

The device works as follows.

If the A or C phases are damaged, the main wire triggers a relay 1 or 3 voltage and, with its normally open contact 13 or 19, closes the coil circuit of the intermediate relay 4 or 5, which with its closing contact 16 or 20 becomes self-holding. Further operation of the device is associated with the result of the action of the automatic reclosing switch of the damaged overhead wire at the transmitting substation. Therefore, an intermediate relay 4 or 5 with its fault by its contact 30 or 31 starts the time relay 10, the setpoint of which is selected with the specified time reserve of the automatic recloser. If the voltage of the damaged phase on the receiving or intermediate substation buses, i.e. with successful reclosure, then lockout relay 12

03623

Failure to open contact 36 returns the circuit to the initial state and no commutation occurs at the indicated substations, i; If: ke on the damaged phase A or C does not restore the voltage, i.e. in case of unsuccessful reclosing, then the relay time is 1, which by its contact 37

10 closes the switching circuit of the switching device 47 or 49, as well as 51, since the intermediate relay 4 or 5 has already prepared a trip circuit with its closing contact 38 or 39

15 separators 47 or 49, as well as 51, After the separators 47 or 49 and 49 are disconnected, 51 is signaled to activate the separators 50 or 52 to the phase A or C of the additional wires

20 yes. since the circuit has already been prepared including separators 50 or 52; 3; or contact 40 or 41 gaps of the Exact relay 4 or 5, and block contacts 44 of the separator 5 and 42 are closed

25 linH 43 separators 47 or 49.

If the main or additional wire of phase B is damaged, it releases Rels 2 voltages and opens it with its 11 1 pin 23

30 is a coil circuit of intermediate relays 6 and 7. At the same time, a relay 8 or 9 of the power direction is activated, which determines the damaged wire in the double wire phase.

d Damaged - the wire is considered in which the direction of the wheel is changed in relation to the advanced one. After closing the contacts 24 or 25 relays 8 or 9, it will work

Q intermediate relay 6 or 7, which by its contact 28 or 29 is set to self-holding and by contact 45 or 46, sends a signal to disconnect the switching device from that 48 or 51 damaged wires.

If one of the wires of phase B is damaged from the side of the supplying substation, both prog water is provided, and then the voltage is restored by the action of the ARC only on the intact wire.

3J Star o K 4O f f omffe / mmraeu futau

 I - a basic addendum Phase vapvl- I I thread lngo projection

 J. otk / trovfHue take fiftau to her

ff foI dennovae and ffonoanamf / t Hote itpataa

- -1 j

-l-Ni I // About the inclusion of        14i - iT Significantly npoSoia IPG :: «r

g /

SO / 51/52 /

17 / CV / 1 9 /

FIG. 2

Compiled G.Kovel Editor O.Golovach Tehred M.Parotsay Proofreader I.Musk

Order 8426/57 Circulation 619 Subscription

VNISHI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR SELECTING A DAMAGED ELECTRIC TRANSMISSION LINE WIRE WITH AN EXTRA WIRE, containing current and voltage transformers installed on the power line with an additional wire, three voltage relays connected to voltage transformers, three intermediate relays, in the power supply circuit of the windings of which are included voltage relay contacts, intermediate contacts relays are included in the disconnect circuit of the wire separators · power lines, time relays, characterized in that, in order to improve the accuracy of determining This damage by identifying a damaged phase, it additionally introduced a fourth intermediate relay, a second time relay, a blocking relay and two power relays, the voltage windings of which are connected to voltage transformers, and the current windings - to the phase current transformer of the main and auxiliary wires, and the power circuit of the winding of the first intermediate relay, which has a self-pickup from its make contact, includes a series-disconnect contact of the first and make contacts of the second and third on the voltage relay, in the power circuit of the winding of the second intermediate relay, which has a self-pickup from its make contact, are connected connected in series _{with the} contact of the third and make contacts of the first and second voltage relays, a chain of series-connected make contacts of the first and third and make contacts of the second the voltage relay is connected through the make contacts of the first and second power relays to the windings of the third and fourth intermediate relays, respectively, having a self-pickup of of their make contacts, the disconnect contacts of the interlock relay are included in the common power supply circuit of the windings of the first, second, third and fourth intermediate relays, the power supply circuit of the windings of which includes the series-connected make contacts of the first, second and third voltage relays and the contact of the first timer , in the power circuit of the winding of which is connected connected in parallel closing contacts of the first and second intermediate relays, and SU. „. 1203623 in the power supply circuit of the winding of the second time relay, contacts of the first time relay, closing with time delay, closing with time delay, contacts of the second time relay and closing contacts of the first and second intermediate relays are included in the disconnect circuit of the auxiliary phase B isolators and the main wire of phases A and C, the closing contacts of the third and fourth fourth relay relays are included in the deviation circuit of the separators of the main and additional wires of phase B, the closing contacts of the first and second omezhutochnyh cheny including The relay switching circuit in the additional phase separators wires A and C.