SU1150688A1 - Device for automatic closing of switching device - Google Patents

Abstract

AUTOMATIC SWITCHING DEVICE for a SWITCHING DEVICE equipped with a minimum overvoltage relay, overcurrent protection sensor and remote control blocking relay containing two inputs and two outputs of external unlock, two power supply buses, a overcurrent memory relay with two closing, two opening contacts and a capacitor, pushing the contacts of the remote control lock relay, the closing contact of the overcurrent protection sensor and the manual unlock button In this case, the first power bus through the disconnecting contact of the overcurrent protection memory relay is connected to the first capacitor plate and, in series, the closing contact of the sensor with maximum overcurrent protection and the first pefis winding of the maximum current memory to the second capacitor plate and the second power bus which is connected via the manual release button to the first terminal of the disconnecting contact of the remote control lock relay and through the second winding and the first closing contact of the relay A mt is connected to the first power bus, the first output of the external release circuit is connected to the first terminal of the second closing contact of the memory relay, the outputs of the external enable circuit are connected to the inputs of the external enable circuit of the device located closer to the source of controlled voltage, characterized by In order to increase the reliability of the device, it is additionally equipped with a second disconnecting relay with a contact for the remote control lock and two switch over keys of the minimum voltage protection relay, and The external input of the external enable circuit through the closing contact of the first toggle key is connected to the second bus power line and through the normally open contact of the first toggle key to the first output of the external enable circuit, OS to the second input of the external enable circuit via the amp and external contact of the secondary toggle switch the key is connected to the second terminal of the first disconnecting contact of the remote control lock relay, and through the disconnecting contact of the second toggle key to the second output of the external release circuit, which It is connected via the second break contact of the remote control lock relay to the second terminal of the closing contact of the overcurrent memory relay.

Description

one

The invention relates to electrical engineering and is intended to automate the control of high-voltage mine distribution networks, in addition, it can be used in power supply systems for mines with non-selective overcurrent protection.

A device for automatic restoration of the power supply network with which each switching device in the power supply network of the mine is turned on is turned on; its minimum protection relay for voltage, maximum overcurrent protection switch

automatic reclosing unit containing a relay of overcurrent protection memory, closure;: cdc contact of the unlocking button, closing contact of the overcurrent protection memory relay and automatic unblocking latching contact, and at the automatic reclosing node the activation circuit of the overcurrent memory relay is formed by the closing contact of the overcurrent protection sensor, and the disconnecting circuit (detaching) is connected in parallel by the closing contacts of the automatic debi okirovki and manual unlocking lj button.

The disadvantage of this device is its low reliability due to the fact that during a short circuit in the network after the feeder cell, fed through a section cell at a substation, the latter does not automatically turn on, i.e. There is an incomplete recovery of a disconnected network. In addition, in this device, it is possible to re-apply voltage to a short-circuit current.

The closest to the proposed technical solution is the y-switch of automatic switching on of the K mutation apparatus, which contains two power buses, a minimum voltage protection relay, overcurrent protection sensor, two inputs and two external deblocking outputs, a closing contact of the remote control lock relay and a node automatic reclosing with overcurrent memory relay, manual release button, two closing and two

506883

opening contacts of the overcurrent protection memory relay, two disconnecting contacts of the remote control lock relay, closing contact of the overcurrent protection sensor 2J.

The disadvantage of this device is its relatively low reliability due to the fact that

10 high-voltage distribution network of the mine, as a rule, consists of several switching devices connected in series and in the event of a short sai-fcri .S kani on one of the downstream ports of one of the devices5, others, due to non-selectivity of protection, as mentioned above, are turned off due to sensor triggering

20 overcurrent .s. However, in some cases in vsl: Ds; if the combo devices can be unequally lagged, one or several of them are successively disconnected due to the tripping of the overcurrent protection sensor feminine

Q In this case, when the power supply network is automatically restored ;; in case of its collapse as a result. (short circuit, the power supply will be restored only to the switching device (from among connected in series), which is disconnected due to the operation of the minimum voltage switch on the voltage, while the short circuit takes place at the outgoing connection of the located switchgear.

11el of the invention - increasing the reliability of the automatic device

restoration of the power grid.

The goal is achieved

the fact that the device automatically turn on the switching apparatus, equipped with a minimum protection relay

overvoltage, overcurrent protection sensor and remote control lockout relay containing

two inputs and two outputs of external unlocking circuits, two power buses, overcurrent memory relay. with two locking and two opening contacts and a capacitor, a remote control locking relay opening contact, an overcurrent protection closing contact and a manual release button , at the same time, the first power bus through the disconnecting contact of the memory relay of the overcurrent protection is connected to the first capacitor plate and through the series-connected closing contact of the sensor the first overcurrent memory relay is connected to the second capacitor plate and the second power bus, which is connected to the first terminal of the disconnecting contact of the remote control lock relay via the manual release button and to the second relay contact of the memory relay the first power bus, the first output of the external release circuit is connected to the first terminal of the second closing contact of the memory relay, the outputs of the external enable circuit are connected to the inputs of the external release circuit The device located closer to the switching voltage source is additionally equipped with a second disconnecting contact of the remote control lock relay and two cross keys of the minimum voltage protection relay, with the first input of the external release circuit connected to the second power bus and through the opening contact of the first cross over key - to the first output of the external release circuit, the second input of the external release circuit via the closing contact The reversing key is connected to the second terminal of the first disconnecting contact of the remote control lock relay J and via the disconnecting contact of the second reversing key BTopovry to the output of the external unlock circuit, which through the second ram of the remote control is connected to the second relay of the locking contact relay memory current protection. In the drawing of a device, the automaton device is: -:: whom the switching on of the commutation and cryogenic coping machine:;: 1; and this and the Ko connection diagram; :: i7fSiUHOHHbix devices for --- jjv: -n .. jip, SLROW The automatic switching-on of switching devices 2-5 contains change-over contacts 6 and 7 of the minimum voltage protection unit, relay 8 of the maximum current protection memory with the closing 9 and 10 and disconnecting 11 and 12 pins, disconnecting contacts 13 and 14 of the remote control lock relay, manual release button 15, diode 16, resistor 17 and 18, capacitors 19 and 20, power bus 21 and 22, outputs of external unlock 23 and 24, inputs external release circuits 25 and 26, switching circuit disconnects 27 and 28 of the device and the closing contact 29 of the overcurrent protection sensor 9. The switching device contains a switch 30 that switches the high-voltage power circuit 31. The power bus 21 through the diode 16 and the resistor 17 is connected to the capacitor 19 and the first winding of the relay 8 of the overcurrent memory and through the clamp contact overcurrent protection sensor 29 and the disconnecting contact 12 of the relay 8 of the overcurrent protection memory are connected to the power bus 22. The power bus 22 is through the closing contact 10 of the relay 8 of the overcurrent protection memory, stitch tied by a resistor 18 and a capacitor 20, through the second winding of the relay 8 and the manual release button 15 is connected to the power bus 21, the outputs of the external unlock circuit 23 and 24 are connected in series by the closing contact 9 of the relay 8 of the overcurrent protection memory and the disconnecting contact 13 of the remote lock relay management The input of the external release circuit 25 through the closing contact of the toggle key 6 is connected to the power bus 21, and through the disconnecting contact of this key to the output of the external release circuit 23. The input of the external unlocking circuit 26 through the series-connected closing contact of the toggle key 7, disconnecting contact 14 of the lock relay The remote control and manual release button 15 is connected to the power bus 21. In the circuit presented, the diode 16 prevents the discharge of the capacitor 19 when it is removed from the voltage device, the resistor 17 limits It provides charging current for capacitor 19, contacts 10 and 12 of relay 8 for overcurrent memory protection serve to protect the windings of this relay against overloads, and resistor 18 and capacitor 20 are designed to ensure reliable switching of relay 8 when its contact 10 is opened. These elements for the device to automatically turn on the switching device by the Service Centers and their operation is not considered below. The device operates as follows. When high-voltage devices 2-: 5 are turned on, a high voltage from an external substation (not shown) comes to the consumer (connected to device 5, not shown). In this case, the capacitors 19 of the automatic switching device 1 in the switching devices 2-5 are charged before the voltage of the pigment. If there is a short circuit in the high-voltage network, for example, at the output of apparatus 5, there are various options for disconnecting the high-voltage network. Consider two options typical for coal mine conditions. Option 1. All switching devices are loaded uniformly and with all the short-circuits of all these The devices operate overcurrent protection sensors which disconnect these switching devices.At the same time, when closing: 29 the overcurrent protection sensor 29, the capacitor 19 is discharged through the switch The relay opens 8 maximum current protection values and transfers this relay to a new stable position. The opening contact 11 of memory relay 8 is connected to the power supply circuit of the switching device switching unit and when it is opened, the current is de-energized, making it impossible to switch the switching device on. When switching relay 8 in the automatic restoration circuit, contacts 9 in all switching devices are closed. Then the process of automatic restoration of the high-voltage network begins. In the switching device 2, the minimum voltage protection unit is turned on (not shown), since, under the coal mines, when the short circuit occurs in the mine, the switching 88 devices of the external substation are not switched off, and the minimum protection unit is turned on when high voltage parat. The inputs of the external enable circuit 25 and 26 of apparatus 2 are connected to the power bus 21 and 22 of this apparatus. In switching devices 3-5, contacts 9 of relay 8 of the memory of overcurrent protection are closed, and the outputs of external unlock circuits 23 and 24 of these devices are shorted and connected to inputs 25 and 26 of device 2 via reversing keys 6 and 7 of minimum protection blocks for tension devices 3 and 4, which are currently disabled. In this case, the power supply busses 21 and 22 of the switching device 2 are closed through contact 9 of the relay 8 of the overcurrent memory of the downstream switching device 3, 4 or 5. At the second winding of the relay 8 of the memory of the switching device 2, this relay takes its original state contact at which it closes contact 11, allowing the switching on of the switching apparatus and using an automatic single-turn-on device included in the switching apparatus or hours (the controller’s switching it on. Through the switch 30, the high voltage from the device 2 is transmitted to the device 3, in which the minimum voltage protection unit is turned on, its contacts 6 and 7 are switched, breaking the circuit between the input 25 and 26 of the switching device 2 and the output of the external circuit The unlocking 23 and 24 of the switching device 4. At the same time, similarly to the case described by you, the power supply lines 21 and 22 of the switching device 3 are locked through the second winding of the relay 8 of the memory max} stray current protection in the switching device 3 and the closed contact 9 of the relay PA ti downstream the switching device 4 or 5, wherein the relay 8 is switched to permit the inclusion of the switching device 3. After its incorporation through its switch 30, a high voltage is applied to the switching device 4, etc. The automatic recovery process ends after switching on the switching device 4, since the device 5 has open inputs of external enable 25 and 26 and its memory relay 8 does not switch. After the end of the automatic recovery process from the dispatcher or by using a special device, such as a time relay, a signal is given to the remote control lock relay and this relay switches. At that, its contacts 13 and 14 are opened, excluding this switching device 5 from the automatic restoration of the high-voltage network of the shaft until the closure is eliminated and the remote control lock relay switches to its original position. Option 2, In the event of a short circuit at the output of the switching device 5, in devices 3 and 4, the overcurrent protection sensors do not work, and in devices 2 and 5 they do not work. When the maximum current current sensor is triggered in the switching device 2, the latter is switched off and removes the voltage from devices 3 and 4 and they are also disconnected, but because of the operation of the minimum voltage protection unit. In this case, the process of automatic restoration of the high-voltage network proceeds as follows. If the device has voltage 2, the changeover contacts 6 and 7 switch, as a result of which its power buses 21 and 22 are connected to the inputs of external unblocking circuit 25 and 26. In switching devices 3 and 4, as mentioned above, contacts 9 of relay 8 memory When the overcurrent protection is open, however, in the device 5 this contact is a jack888 whip (the overcurrent protection sensor has triggered), the power supply of the second winding of the 8 memory overcurrent protection of the switching apparatus 2 is closed and the relay 8 switches to enable the switching apparata- 2, after its incorporation occurs commutation switch; 3 and 4, since the overcurrent memory relay did not work in them, and the switch-on circuit of the device was not blocked. The recovery process is completed by the fact that, as in option 1, a special command from the controller from the time relay triggers the remote control lock relay, breaking the circuit between the outputs of the auto-restoration circuit 23 and 24 of the switching device 5. The necessity of this operation follows from the fact that after completion of the recovery process, a new circuit of the power network may occur, for example, at the output of apparatus 4 and without the presence in the restoration circuit of the disconnecting contact 13 of the lockout device; n ua faulty high-voltage network, which is not admitted safety regulations in coal and shale mines. The positive effect of the application of the invention as compared with the device adopted for the prototype is in the reliability of the device, resulting in reduced mine downtime due to the lack of power supply when the high-voltage network of the mine is not fully restored when it is disconnected due to a short circuit.

Claims (1)

DEVICE FOR AUTOMATIC TURNING ON OF THE SWITCHING APPLIANCE, equipped with a minimum voltage protection relay, a maximum current protection sensor and a remote control interlock relay, containing two inputs and two outputs of external unlocking circuits, two power buses, a maximum current protection memory relay with two NO, two NO contacts and capacitor, NC contact of the remote control lockout relay, NC contact of the overcurrent protection sensor and manual release button, with In this case, the first power bus is connected to the first capacitor plate via the NC contact of the overcurrent protection relay, and through the series-connected NC contact of the overcurrent protection sensor and the first winding of the overcurrent memory relay set! - to the second capacitor plate and the second power bus, which is connected via the manual release button to the first terminal of the NC contact of the remote control lock relay and through the second winding and the first NC contact of the memory relay to the first power bus, the first output of the external enable circuit is connected to the first terminal of the second make contact of the memory relay, the outputs of the external enable circuit are connected to the inputs of the external enable circuit of the apparatus located closer to the switching voltage source, from characterized in that, in order to increase the reliability of the device, it is additionally equipped with a second NC contact of the remote control lockout relay and two change-over switches of the minimum voltage protection relay, the first input of the external unlocking circuit connected to the first contact of the first change-over switch to the second writing bus and through the opening contact of the first flip key to the first output of the external unlock circuit, the second input of the external unlock circuit through the make contact of the second flip th switch is connected to the second terminal of the first break contact remote safety relays, and through the break contact of the second rocker switch - to the second output circuit external unlocking, which through the second break contact of the remote control locking relay is connected to the second terminal of the make contact memory switch overcurrent.