RU154170U1 - ELECTRICAL SAFETY COMPLEX IN THE PERFORMANCE OF OPERATIONAL SWITCHING ON ENERGY OBJECTS - Google Patents

Abstract

The electrical safety complex in the production of operational switching at power facilities, containing proximity sensors, block locks of switching device drives, respectively, two and one to the switching device, a logical locking device and an operator panel connected in series, a power supply unit, characterized in that the controller is additionally connected in series control and PLC-modem of the local level, as well as PLC-modem of the upper level, while the input-output ports of the controller and the controls are connected to non-contact position sensors and block locks of the switching apparatus drives, and the input of the PLC modem of the local level to the power supply, to which the input of the PLC modem of the upper level is connected, and its output to the logic blocking device.

Description

The utility model relates to devices that ensure electrical safety at power plants and substations during operational switching based on the use of interlocking drives of switching devices.

A device for operational blocking (Operational locks on the basis of KP Iset. Yekaterinburg: NTK Interface, 2010, p. 4-7)), which contains a block lock, block contacts for receiving telemetry signals about the position of the switching device via cable lines, a logic circuit blocking, implemented programmatically, a relay that closes contacts upon successful verification of logic. Thus, voltage is applied to the block lock and the lock is unlocked. The disadvantages of the device are low reliability, due to the difficulty of maintaining the required level of isolation of the electrical circuits of both power and telemetry, as well as the appearance during operation of the mismatch of the position of the rotary element of the switching apparatus with the position of the rotary shaft of the contact blocks informing about the position of the switching apparatus.

A microprocessor-based operational blocking device is known (BEMP-1-24 microprocessor-based operational blocking device http://rza.cheaz.ru/index.php/6-35kv/bemp-1/bemp-1-24) containing a discrete signal input unit with block contacts on the position of switching devices, a logic diagram block, an indication block, a discrete signal output unit, and a relay for switching switching power supply circuits of locks.

The disadvantages of the known device are:

- unreliable operation due to the large number of movable and fixed block contacts located on the drives of the switching devices, and the occurrence during operation of the mismatch of the position of the rotary element of the switching device to the position of the rotary shaft of the block contacts, signaling the blocking circuit about the position of the switching device, for account of backlash and free moves in the joints of parts of the drive mechanism and large gaps in the articulated joints of rods;

- the difficulty of maintaining the required level of insulation of electrical circuits.

Closest to the proposed utility model is a device for electromagnetic interlocking of switching devices (Description of the invention to the patent of the Russian Federation No. 2274918, class IPC H01H 9/28, publ. 10.12.2005), containing the number of contactless signaling devices connected in series for a specific energy object position, wireless transmitter, receiver and relay, the contacts of which are connected to a logic circuit, the outputs of which are connected by wires to the corresponding block-lock switching of the device, as well as an electromagnetic switch with a wireless transmitter that through the receiver and the relay connects the power supply to the logic circuit when the key is inserted into the solenoid block castle.

The disadvantages of the known electromagnetic lock device are: firstly, the continuous transmission of radio signals from position sensors (two for each switching device). With a certain number of switching devices, due to the loaded ether in the radio exchange between the sensor and the receiving device, malfunctions can be observed, especially in severe conditions of the electromagnetic environment of power facilities. In addition, the continuous operation of the transmitters puts forward additional requirements for the power of power supplies. Secondly, the known device assumes the existence of long lines from the logic circuit to each block lock, which significantly reduces the reliability of the device due to violation of the insulation of the lines.

The technical task of the proposed utility model is to increase the reliability of switching devices and reduce installation and commissioning costs by eliminating the continuous radio exchange between the sensors of the switching devices and receiving devices, as well as by eliminating additional communication lines from the logic unit to the block locks.

The technical effect of minimizing the operation of setting the kit in determining the position of the drive of the switching device is achieved by the fact that in the known device for electromagnetic locking of switching devices at an energy facility containing proximity sensors, the drive locks of the switching devices are respectively two and one to the switching device, connected in series a logical locking device and an operator panel, a power supply, are additionally introduced in series control controller and PLC-modem of local level (generally accepted abbreviation Power line communication - information exchange over power lines), as well as PLC-modem of the upper level, while the input / output ports of the control controller are connected to non-contact position sensors and block locks of switching drives devices, and the input of the PLC modem of the local level to the power supply, to which the input of the PLC modem of the upper level is connected, and its output to the logic blocking device.

The introduction of a control controller and PLC modems makes it possible to exclude extended control lines for block locks by transferring this function to a controller located in close proximity to switching devices. In addition, the use of data transmission on the status of switching devices and control commands on power lines allows you to abandon the use of radio. Thus, to create a system of operational blocking, only power lines must be laid, while a ring topology is permissible. The above stated in the aggregate allows to increase the reliability of the interlock system while reducing the amount of installation work.

An example of a utility model is illustrated by a drawing, which shows a functional diagram of the complex as applied to its use in an energy facility containing an electrical substation for a linear disconnector with two grounding knives.

The electrical safety complex contains proximity sensors 1, 2 of the “on” and “off” positions of the switching device, respectively, an electromagnetic block lock 3 of the switching device’s drive, a control controller 4, a local level PLC modem 5, a top level PLC modem 6, a logic device 7 locks, power supply 8 and operator panel 9. In this case, the input-output ports of the control controller 4 are connected to proximity switches 1, 2 of the position sensors and block locks 3 of the switching apparatus drives, and the input of the PLC modem 5 of the local level to the power supply unit 8, to which the input of the PLC modem 6 of the upper level is also connected , and its output to the logic device 7 lock.

The complex electrical safety works as follows. Preliminarily, data on the switching devices of the power facility are entered into the logical locking device 7: name, identifier address, and logical expressions to enable the switching device to be turned on and off. The indicated data are presented in the form of a relational table in which the current state of the switching apparatus and the values of logical expressions are reserved. After that, the logic blocking device 7 sequentially through the PLC communication channel polls the status of switching devices at identifier addresses, i.e. the state of proximity sensors 1, 2 positions, calculates the above logical expressions and fills in the corresponding fields of the table switching devices. For switching devices in which the logical expression is true, the locking logical device 7 sends a PLC enable command to the corresponding control controller 4, which unlocks the lock block 3 of the drive of the switching device. On the panel 9 of the operator displays the status of switching devices and block locks. Subsequently, the logic blocking device 7 monitors changes in the position of the switching apparatuses by processing messages from controllers 4 of the control, in which proximity sensors 1,2 of the position signaled a change in the state of the switching apparatuses. Thanks to this, the complex continuously maintains the current state of the operational blocking system.

In addition, the architecture of the complex, as well as a single software and hardware environment of the controllers 4 of the control and the logical device 7 lock allows you to perform a backup function by organizing on one of the controllers 4 of the control spare logic device.

Thus, the complex minimizes the number of communication lines between the blocking elements of switching devices by the control point, and also localizes the collection and control functions. In aggregate, this allows to increase reliability in comparison with the known operative locking devices.

Claims (1)

The electrical safety complex in the production of operational switching at power facilities, containing proximity sensors, block locks of switching device drives, respectively, two and one to the switching device, series-connected logical locking device and operator panel, power supply, characterized in that the controller is additionally connected in series control and PLC-modem of the local level, as well as PLC-modem of the upper level, while the input-output ports of the controller and the controls are connected to non-contact position sensors and blocking locks of the switching apparatus drives, and the input of the PLC modem of the local level to the power supply, to which the input of the PLC modem of the upper level, and its output to the logic blocking device, is also connected.

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