RU1812567C - Device for control of high-voltage switch drive - Google Patents

Abstract

Usage: in the drives of high voltage circuit breakers. SUMMARY OF THE INVENTION: in a drive control device for a high-voltage circuit breaker, comprising switching on and off control electromagnets and two interlocking contacts of mutually inverse action, the first of which is closed in the open and open in the turned-on positions of the switch, a time relay with closing and opening contacts with a delayed response , which allows to reduce the harmful consequences of emergency shutdown of the circuit breaker, if there is a command to turn on by providing its emergency Sleep th. 3 ill. ate

Description

The invention relates to electrical engineering / more specifically to electrical drive control devices for high voltage circuit breakers.

The purpose of the invention is the creation of such a control device that would exclude the following negative phenomena caused by the on / off switch: the burnout of the windings of the drive control solenoids (regardless of the type and design of the latter): burnout of the power windings of the drive solenoids of electromagnetic drives and direct-drive electric motors ; welding, and also capable of causing an explosion, a slow divergence of contacts

circuit breakers controlled by single-acting spring-loaded actuators equipped with a free trip mechanism (MCP), i.e. a mechanism that allows the motor element of the drive and the contacts of the switch to be disconnected during switching on.

In FIG. 1 is a schematic diagram of an inventive drive control device for high voltage circuit breakers.

The circuit includes a control unit (key) 1 (located outside the claimed device and made, for example, in the form of a universal switch type UP-5314 / A-301, winding 2 of the trip control solenoid, connected

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to the output of the control unit through the locking contact locking contact 5 and to the general output of the device; winding 3 of an electric control switch; connected to another output of the control unit through the opening interlocking contact -: step 4 and: to the general output; coil 6 time relay connected to the output of the contact ..; 4 from the side of winding 3 and to the common terminal, V and relay contacts are times - disconnecting 7, ;;:: connected in series to the coil 3: solenoid on / between it and the common terminal, and closing -; .shyy 8, connected between the output of the block; : leveling contact 4 from the side of winding 3 and the output of the interlocking contact 5 from the side of winding 2 of the solenoid for the trip control. If necessary, to reduce the current in the relay coil $, a resistor can be connected in series with it between the terminal of the blocking contact 4 from the side of the winding 3 and the common terminal::.

When a command is sent through block 1 to

turning on sheath 3 receives power

thanks to closed contacts 4 and 7. When

. this flows around the current “turnip coil 6

time.

,:: If the start-up takes place within the set time, then upon its completion it is connected to the output circuit of the drive; blocking: yshshgaEt4razmdaa @ tsoe coils 3 w in the mains power supply. Her and the process of switching on zeros, and through erym delayed: zhki. on which relay

: contact 4 is not open - opens

; pin 7 and note the contact. 8. Consequence: it, without the intervention of an operator, ensures the supply to the winding 2 of the electromagnetizuyrash to the winding by switching off. -A, this, in turn), also ensures that the switch is disconnected, by the will of Spnevstiche. hydraulic,} - of two-way action: or - of one-way action with the mechanism of free tripping (electric: electromagnetic, pneumatic, hydraulic, spring loaded).

Figure 2 illustrates a specific example of the uses of the invention for controlling an electromagnetic drive:., Single acting, equipped with; with free tripping. The device contains a control key,; 1, a coil (winding) 2 electromagnets of control of shutdown pressure, connected by mechs. , with the core of this electromagnet, locking contacts 9 (against bouncing), designed to prevent repeated switching on when the Standby command disconnects and holds the control key in the On position, coil 3 of the contactor (switching control electromagnet) with contacts 10, control serving

voltages to the winding of the power switching electromagnet EV, mechanically connected to the output shaft of the drive interlock contacts of inclusion 4 and disconnection 5, coil b time relay with

opening 7 and closing 8 contacts,,; .:; .:. :; -:; ./ /,.;:..g ;. / - ..; .: ..; .- The device operates as follows. / ;; -.-,; /;.; ..:. When issuing a command to enable ift.e.

when the corresponding contacts are closed on the control unit), the coil 3 of the contactor receives power through the closed contacts 9.4 and 7. At the same time, the time relay coil 6 also flows .. ;;.: ..,: ..,.; .

If the circuit breaker is turned on full time, and the on-time does not exceed the relay setting time, then by opening contact 8 (at the very end of the on-time), the voltage from coils 3 and 8 is removed. Take off

The voltage from the coil 3 leads to the opening of the contacts to the contactor, as a result of which the coil of the power electromagnet EV is de-energized, and its core returns to its original position. But the contacts

controlled vykuyuchatel HC remain

closed (and its disconnecting springs -

cocked) thanks holding

drive mechanism, before applying voltage

to the coil 2 E0. . i.:.V-;:;-.

If the contacts of the controlled circuit breaker “e” have fully reached the latched position during the relay holding time, then after this time the contact 7 is disconnected. close, and pin 8 closes. Wherein

contactor coil 3 and therefore

kztushkz E8 de-energized. and the coil 2 Er will be. under voltage, Thanks to the closed contacts of the control unit, con-. bars 9 .. 4 and 8. Impact on the mechanism

a free trip (MCP) core 30 will interfere with the drive output shaft,

and, consequently, the contacts of a controlled switch (HC). with a core E In that

will cause the circuit breaker to trip under the action of its cocked springs.

Thus, the proposed device provides (if the switching on is incomplete for a certain time), not only preventing burnout of the contact coils and the switching electromagnet (by removing the voltage from them, due to opening of contact 7), but also preventing it. welding of contacts of the controlled circuit breaker due to self-development and execution of the ria command

fractions of a second after a failure to turn on, thereby eliminating conditions that could lead to an explosion.

Fig. 3 illustrates an example of the use of the invention in controlling a single acting spring-loaded actuator (provided with a free-release mechanism). The numbering of the elements nz of Fig. 3 to pos. 8 inclusive is the same as in Figs. 1 and 2.

In addition to these elements, the device includes a spring factory electric motor that is switched off by terminal 9 when this process is completed, contacts 10 of the drive output shaft position that control the operation of the signal lamps and sirens on the control panel, emergency shutdown contacts 11 (closed when the drive is turned on and opened only when it is disconnected from the key, controlled or manually) and the contact 12 of the state of the springs, closed upon completion of their factory.

The elements of the device are shown in the position occupied by them with the drive turned off and its springs uncovered.

As can be seen, the drive control device shown in Fig. 3 differs fundamentally from that described only by the presence of a time relay with coil b, opening contact 7 and closing contact 8.

The operation of the device differs from the operation of the prototype in that if the switch controlled by the drive is not closed for any reason, the switching coil 3 of the electromagnet is de-energized regardless of the position of the contact 12 of the state of the springs and despite the fact that the locking contact 4 does not open) by opening the contact 7 time relay controlled by coil 6 of this relay. In this example, this will duplicate the protection of the coil 3 of the turning on electromagnet against burnout.

In addition, since terminal 8 of the time relay closes (after the time for which the relay is configured), voltage will be applied to the coil 2 of the disconnecting electromagnet. The action of the core of the tripping electromagnet on the mechanism of free trip of the drive will disconnect the movable contacts

the output shaft of the drive, and the circuit breaker is switched off, under the influence of its breaking springs, practically at the same speed as during normal shutdown. This eliminates the welding of the contacts and their slow divergence, fraught with the formation of a standing arc and explosion of the switch.

The device is also applicable for controlling double-acting actuators 10 (the use of which eliminates the need for tripping circuit breaker springs), for example pneumatic or hydraulic, with the same effect.

Claims (1)

Claims 15 High voltage circuit breaker drive control device comprising turn-on and turn-off control electromagnets, input terminals for turn-on and turn-off commands, and two mutually inverse action contact contacts, the first of which is closed in the open and open position of the switch, the first output windings of the on-control solenoid through 5 a contact circuit containing a first interlock contact is connected to an input terminal for an on command, the first od electromagnet control coil through the second latching disconnecting contact 0 is connected to the input terminal koman-. trips, and the second terminals of the windings of the electromagnets for controlling on and off are connected to a common terminal, characterized in that, in order to 5 reduce the harmful consequences of emergency failure to turn on the circuit breaker when the on-chip command is not turned on by ensuring its emergency self-shutdown, a time relay with N. 0. and NO contacts with a delay on operation, moreover, the NO contact of the time relay is connected in series with the winding of the control solenoid between said con 5 Comp act chain and the common terminal, a control input of the time relay is connected between the terminal, said contact circuit from the switching control of the electromagnet coil and the common terminal and the normally open contact 0 time switch is connected between the same. terminal of said contact circuit; and. the first output of the winding of the control solenoid.  Phi. D