SU1488917A1 - Device for interlocking of switchings in switch gear of electric power stations and substations - Google Patents

Description

The invention relates to electrical engineering and is intended for use in the schemes of switchgears of power plants and substations. The purpose of the invention is to improve the reliability of the device by preventing unauthorized disconnections of power supply lines to consumers "3 in the initial state, the voltage of the operational source 1 is fed to the inputs of the reference circuit 2 and the simulation circuit 3. At the outputs of circuits 2 and 3, related to the same

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same connection, or at the same time there are operational stresses; source when the connection is connected, or the voltage is simultaneously absent when the connection is disconnected. When the service personnel disconnects one of the switches of the controlled switchgear in circuit 3, the contact of the control switch of this switch opens. If the disconnection of this switch does not lead to a change in the station's output scheme, the inputs of all 4 Equivalence blocks of 4 are equivalent logic signals.

From the outputs of blocks 4, the signals "Log.1" are received in block 6, which generates the signal "Log.1" at the output, which enters the execution unit 7. The latter generates a command to turn off the switch. If switching off the circuit breaker leads to a change in the station output circuit, on the inputs of the corresponding block 4 by circuits 2 and 3, unequal-value signals are generated and the output signal of this block 4 takes the value "Log.O". As a result, the output of block 6 And also formed a signal? The "Log.O" cash is received by the executive unit 7 and the command for disabling the switch-off switch is prohibited. At the same time, the corresponding block 5 of the display signals that which connections will be disconnected in the event of the switch off. If disconnection of the connection is permissible according to the operating conditions of the station, then in the execution unit 7, the blocking of the disconnection of this switch can be manually removed using the corresponding key for unlocking. 4 il.

The invention relates to electrical engineering and is intended for use in the schemes of switchgears of power plants and substations.

The purpose of the invention is to increase reliability by preventing unauthorized outages of connections.

FIG. 1 is a block diagram of a switching lock device; in fig. 2 shows an example of a station switchgear; in fig. 3 - examples of the implementation of the reference circuit and the simulation circuit; in fig. 4 scheme of the executive unit.

The device (Fig. 1) contains a source of operational voltage 1, the reference circuit 2, the simulation circuit 3, two-input logic blocks Equivalence 4, the display blocks 5, the AND 6 logic unit, the execution unit 7.

The reference circuit 2 is made in the form of a topological model of a switchgear and is assembled at the relay contacts that follow the position of the switches of the switchgear. Simulation circuit 3 is made in the form of the same topological distribution device circuit and is assembled on series-connected relay contacts, repeating

position of switches, and contacts of switches control keys.

Switchgear (Fig. 2) contains switches B1-B12, generator switches B13-B22, transformers T1-T5, generators G1-G10, generator blocks B1-B5, power lines L1-L4 for power supply to consumers, bus SSh1 and SSh2 stations.

The reference circuit 2 and simulation circuit 3, built for the specified switchgear, contain contacts 8-19 of the relay, repeating the position of switches B1-B12, contacts 20-31 of the control keys of switches B1-B12, outputs 32-36 corresponding to the connection points of the generator units B1-B5 to the chains of switches B1-B12 of the switchgear, outputs 37-40, corresponding to the points of connection of lines L1-L4 to the chains of switches B1-B12, tires 41 and 42, corresponding to the buses SS1 and S1P2. Bus 41 or 42 are connected to the source 1 operating voltage. Contacts 8-19 and 20-31 are closed when the switches B1-B12 are on.

The Executive unit (Fig. 4) contains a voltage source 43 for

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control switches, logic gates And 44, contacts 45–56 of control keys of switches B1B12, contacts 57-68 of keys for unlocking the opening of switches ⁵ B1 — B12 (contacts 47-55 and 59-67 are not marked).

The device works as follows. _ten

During the operation of the switchgear, the B1-B12 switches are turned on and off by the operating personnel by turning the control keys ₁₅

switches. The assignment of schemes for connecting stations and substations to the system is performed by the dispatch personnel of the power systems. The presence of voltage at the outputs 32-40 of the reference ₂ of the circuit 2 and the circuit 3 of the simulation indicates the on state of the connection.

In the initial state, at the outputs of the reference circuit 2 and the simulation circuit 3, 25 referring to the same connection, there are either operational source 1 voltages simultaneously, which corresponds to the on state of this connection, or there are no output voltages simultaneously, which corresponds to the disabled state of this connection.

If one of the B1-B12 switches is disconnected by the station's personnel, in the simulation circuit 3, one of the contacts 20-31 · of the control switches is opened, respectively. If the switching off of this switch does not change the station's output scheme, the inputs of all Equivalence blocks 4 have equivalent logic signals, while from the outputs of blocks 4, the signals Log.1 come to block 6, which generates a signal at its output Log.1 "received in the Executive unit 7 (Fig. 4). The latter forms a command to disable the corresponding key ₀

If switching off the circuit breaker leads to a change in the station output circuit, unequal input signals are formed at the inputs of the corresponding Equivalence block 4 by circuits 2 and 3, the output signal of block 4 takes the value Log.O. As a result, ⁶

At the output of block I 6, the signal "Log.O" is also generated, which enters the execution unit 7 and prohibits the issuance of a command to turn off the switch. At the same time, the corresponding block 5 of the display signals that which connections will be disconnected in the event of the switch off. If the shutdown of these connections is permissible under the operating conditions of the station, the blocking off of this switch can be manually removed by the personnel using the appropriate lock release key.

The proposed device reduces the likelihood of personnel erroneous actions when switching in the switchgear circuit and thereby increases the reliability of operational switching. Unauthorized, erroneous disconnections of power supply lines of consumers, leading to a decrease in the reliability of their work, are prevented.

Claims (1)

Claim The device to block the switching in the switchgear of power stations and substations, containing an operating voltage source and a reference "connected to it" circuit, made in the form of a topological model of a switchgear assembled at the relay contacts, repeating the position of switchgear switches, characterized in that increase the reliability by preventing unauthorized outages of connections, the device introduced an imitation circuit, made in the form topological model of switchgear assembled on series-connected relay contacts, repeating the position of switches, and contacts of switch control keys, two-input logic blocks "Equivalence" and indication blocks according to the number of connections in the switchgear, logical block I and executive unit, and the simulation of the input output connected to a source of operating voltage, the outputs of the reference circuit and the circuit imitation of each connection of the distribution unit— 7 1488917 eight The connections are connected to the inputs of the corresponding "Equivalence" block, the output of one of the display blocks connected to the input, while the outputs of all blocks "Equivalence" are connected to the inputs of the block And, the output connected to the input of the Executive unit. FIG. 3 '1488917 To turn off B12 Phie. four