Shutdown logic circuit for protection starting DCS (Distributed Control System) of generator-transformer unit

Abstract

The utility model discloses a generator-transformer group protection starting DCS system shutdown logic circuit comprising three generator-transformer group protection devices and a DCS system shutdown logic. Each of the three generator-transformer group protection devices comprises three shutdown trip outlets, and the three shutdown trip outlets are connected to a DCS shutdown logic, namely a two-out-of-three logic circuit, through an OR circuit, so that the shutdown logic of the DCS is started by the generator-transformer group protection outlets. The three groups of shutdown tripping outlets are connected to the two-out-of-three logic circuit through the OR circuit to form a shutdown signal loop for the shutdown logic of the generator-transformer group protection outlet starting DCS system, so that the shutdown reliability of the generator-transformer group protection starting DCS system is improved, and the reliability of the generator-transformer group protection starting DCS system is improved. The abnormal accident that the unit cannot be shut down due to the fault of a single external signal cable or the fault of a protection outlet of the generator-transformer unit protection device is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of power system protection, and in particular relates to a generator-transformer group protection starting DCS system shutdown logic circuit. Background Art

[0002] As the level of electrical control automation and thermal automation in power systems continues to improve, electrical and thermal professional logic are closely linked and are of vital importance. With the innovation of technology, the characteristics of the automation control system are also different, and some problems are exposed in coordination and connection. Therefore, the DCS shutdown logic initiated by the generator-transformer group protection is crucial to the safety and stability of the unit and equipment. Figure 1 As shown in the figure, when the cables from the generator-transformer group protection devices A, B, and C to the DCS system cabinet are damaged and broken, the generator-transformer group shutdown signal cannot be transmitted to the DCS system shutdown program, resulting in the inability to shut down. At the same time, due to the configuration requirements of the generator-transformer group protection, the generator-transformer group protection devices A and B are dual electric quantity protection (that is, the protection configuration is the same, and the protection outlets are identical), and the generator-transformer group protection device C is an independent single non-electric quantity protection. When non-electric quantity protection actions such as heavy gas of the transformer and full shutdown of the cooling control occur, once the shutdown trip outlet of the generator-transformer group protection device C fails, the DCS system will not be able to receive the generator-transformer group shutdown signal, which will eventually cause the unit to be unable to shut down, seriously affecting the safety of the equipment.

[0003] Therefore, the traditional DCS shutdown logic initiated by the generator-transformer protection is prone to cause abnormal unit shutdown. Utility Model Content

[0004] In view of the above problems, it is necessary to provide a shutdown logic circuit of the DCS system which is easy to use and can avoid abnormal shutdown of the unit by starting the protection of the generator-transformer group.

[0005] A generator-transformer group protection-starting DCS system shutdown logic circuit, comprising: a generator-transformer group protection A device, a generator-transformer group protection B device, a generator-transformer group protection C device, and a DCS system shutdown logic;

[0006] The generator-transformer group protection A device includes a shutdown tripping outlet A1, a shutdown tripping outlet A2, and a shutdown tripping outlet A3;

[0007] The generator-transformer group protection B device includes a shutdown tripping output B1, a shutdown tripping output B2, and a shutdown tripping output B3;

[0008] The generator-transformer group protection C device includes a shutdown tripping outlet C1, a shutdown tripping outlet C2, and a shutdown tripping outlet C3;

[0009] The shutdown trip output A1, the shutdown trip output B1, and the shutdown trip output C1 are connected to the shutdown logic of the DCS system through an OR circuit, and are used to transmit the first generator-transformer group protection shutdown signal;

[0010] The shutdown trip output A2, the shutdown trip output B2, and the shutdown trip output C2 are connected to the DCS system shutdown logic through an OR circuit, and are used to transmit the second generator-transformer group protection shutdown signal;

[0011] The shutdown trip output A3, the shutdown trip output B3, and the shutdown trip output C3 are connected to the DCS system shutdown logic through an OR circuit, and are used to transmit the third generator-transformer group protection shutdown signal;

[0012] The shutdown logic of the DCS system is a three-out-of-two logic circuit, the first generator-transformer group protection shutdown signal, the second generator-transformer group protection shutdown signal, and the third generator-transformer group protection shutdown signal are connected to the input end of the three-out-of-two logic circuit, and the three-out-of-two logic circuit is used to start shutdown.

[0013] In one embodiment, the shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are connected to the shutdown logic cable of the DCS system through an OR circuit;

[0014] The shutdown trip outlet A2, the shutdown trip outlet B2, and the shutdown trip outlet C2 are connected to the shutdown logic cable of the DCS system through an OR circuit;

[0015] The shutdown trip outlet A3, the shutdown trip outlet B3, and the shutdown trip outlet C3 are connected to the shutdown logic cable of the DCS system through an OR circuit.

[0016] In one embodiment, the shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are all connected to the or circuit via cables;

[0017] The shutdown trip outlet A2, the shutdown trip outlet B2, and the shutdown trip outlet C2 are all connected to the or circuit through cables;

[0018] The shutdown trip outlet A3, the shutdown trip outlet B3, and the shutdown trip outlet C3 are all connected to the OR circuit through cables.

[0019] In one embodiment, the three-to-two logic circuit has a first input terminal, a second input terminal, a third input terminal and a first output terminal; the first input terminal is used to input the first generator-transformer group protection shutdown signal; the second input terminal is used to input the second generator-transformer group protection shutdown signal; the third input terminal is used to input the third generator-transformer group protection shutdown signal.

[0020] In one embodiment, the first output end is connected to a generator-transformer group; the generator-transformer group includes a generator, a transformer, and a circuit breaker; one end of the transformer is connected to the generator, and the other end is connected to the circuit breaker, and the circuit breaker is connected to the first output end.

[0021] In one embodiment, the OR circuit has a fourth input terminal, a fifth input terminal, a sixth input terminal and a second output terminal.

[0022] In one of the embodiments, the second output terminal is connected to the shutdown logic of the DCS system.

[0023] The above-mentioned generator-transformer group protection starts the DCS system shutdown logic circuit, because three groups of shutdown tripping outlets are connected to the three-out-of-two logic circuit through an OR circuit to form a shutdown signal loop, which is used for the generator-transformer group protection outlet to start the DCS system shutdown logic, improves the shutdown reliability of the generator-transformer group protection starts the DCS system, and effectively avoids abnormal accidents that the unit cannot be shut down due to a single external signal cable failure or a generator-transformer group protection device protection outlet failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the DCS shutdown logic initiated by the traditional generator-transformer group protection in the background technology;

[0025] Figure 2 A structural diagram of a DCS system shutdown logic circuit initiated by a generator-transformer group protection in one embodiment. DETAILED DESCRIPTION

[0026] In order to better understand the present invention, the contents of the present invention are further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0027] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe the generator-transformer group protection shutdown signal, input terminal, output terminal, etc., but are not limited by these terms. These terms are only used to distinguish the first generator-transformer group protection shutdown signal, input terminal, output terminal from another generator-transformer group protection shutdown signal, input terminal, output terminal. For example, without departing from the scope of this application, the first generator-transformer group protection shutdown signal may be referred to as the second generator-transformer group protection shutdown signal, and similarly, the second generator-transformer group protection shutdown signal may be referred to as the first generator-transformer group protection shutdown signal. Both the first generator-transformer group protection shutdown signal and the second generator-transformer group protection shutdown signal are generator-transformer group protection shutdown signals, but they are not the same generator-transformer group protection shutdown signal.

[0028] In one embodiment, Figure 2As shown, the utility model provides a generator-transformer group protection starting DCS system shutdown logic circuit, which mainly includes: a generator-transformer group protection A device, a generator-transformer group protection B device, a generator-transformer group protection C device, and a DCS system shutdown logic 100; the generator-transformer group protection A device includes a shutdown trip outlet A1, a shutdown trip outlet A2, and a shutdown trip outlet A3; the generator-transformer group protection B device includes a shutdown trip outlet B1, a shutdown trip outlet B2, and a shutdown trip outlet B3; the generator-transformer group protection C device includes a shutdown trip outlet C1, a shutdown trip outlet C2, and a shutdown trip outlet C3; the shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are connected to the DCS system shutdown logic 10 through an OR circuit. 0 is connected to transmit the first generator-transformer group protection shutdown signal; the shutdown trip output A2, the shutdown trip output B2, and the shutdown trip output C2 are connected to the DCS system shutdown logic 100 through an OR circuit to transmit the second generator-transformer group protection shutdown signal; the shutdown trip output A3, the shutdown trip output B3, and the shutdown trip output C3 are connected to the DCS system shutdown logic 100 through an OR circuit to transmit the third generator-transformer group protection shutdown signal; the DCS system shutdown logic 100 is a three-out-of-two logic circuit, the first generator-transformer group protection shutdown signal, the second generator-transformer group protection shutdown signal, and the third generator-transformer group protection shutdown signal are connected to the input end of the three-out-of-two logic circuit, and the three-out-of-two logic circuit is used to start shutdown.

[0029] Compare Figure 1 and Figure 2 , Figure 2 The shutdown trip output A1 in can be Figure 1 The traditional generator-transformer group protection starts the shutdown tripping output A of the DCS shutdown logic. Figure 2 The shutdown tripping outlet A2 and the shutdown tripping outlet A3 in the figure can be the newly added shutdown tripping outlets of the generator-transformer group protection A device; Figure 2 The shutdown trip output B1 in can be Figure 1 The traditional generator-transformer group protection starts the shutdown trip output B of the DCS shutdown logic. Figure 2 The shutdown tripping output B2 and the shutdown tripping output B3 in the generator-transformer group protection device may be the newly added shutdown tripping outputs of the generator-transformer group protection device B; Figure 2 The shutdown trip output C1 in can be Figure 1 The traditional generator-transformer group protection starts the shutdown tripping output C of the DCS shutdown logic. Figure 2 The shutdown tripping output C2 and the shutdown tripping output C3 can be the newly added shutdown tripping outputs of the generator-transformer group protection C device.

[0030] Figure 1 The traditional generator-transformer group protection starts the DCS shutdown logic, which includes a DCS system signal expansion module. Figure 2As shown, the original DCS system signal expansion module is cancelled, and two shutdown tripping outputs are added to each generator-transformer group protection device to connect to the DCS system path to form a shutdown signal loop, which is used for the generator-transformer group protection output to start the DCS system shutdown logic.

[0031] like Figure 2 As shown, the shutdown trip output A1, the shutdown trip output B1, and the shutdown trip output C1 are connected to the DCS system shutdown logic 100 through an OR circuit. As long as any one of the shutdown trip outputs A1, the shutdown trip output B1, and the shutdown trip output C1 is started, the first generator-transformer group protection shutdown signal can be generated through the OR circuit and then transmitted to the DCS system shutdown logic 100; the second generator-transformer group protection shutdown signal and the third generator-transformer group protection shutdown signal are also generated and transmitted in the same way.

[0032] Among them, the DCS system shutdown logic 100 can be a three-out-of-two logic circuit, that is, as long as two of the first generator-transformer group protection shutdown signal, the second generator-transformer group protection shutdown signal, and the third generator-transformer group protection shutdown signal are transmitted to the three-out-of-two logic circuit, the next step can be performed to start the shutdown.

[0033] In this embodiment, since three groups of shutdown tripping outputs are connected to the three-out-of-two logic circuit through an OR circuit to form a shutdown signal loop, which is used for the generator-transformer group protection output to start the DCS system shutdown logic 100, the reliability of the generator-transformer group protection to start the DCS system shutdown is improved, and the abnormal accident that the unit cannot be shut down due to a single external signal cable failure or a generator-transformer group protection device protection output failure is effectively avoided.

[0034] In one embodiment, the shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are connected to the shutdown logic cable of the DCS system through an OR circuit; the shutdown trip outlet A2, the shutdown trip outlet B2, and the shutdown trip outlet C2 are connected to the shutdown logic cable of the DCS system through an OR circuit; the shutdown trip outlet A3, the shutdown trip outlet B3, and the shutdown trip outlet C3 are connected to the shutdown logic cable of the DCS system through an OR circuit.

[0035] In one embodiment, the shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are all connected to the OR circuit through cables; the shutdown trip outlet A2, the shutdown trip outlet B2, and the shutdown trip outlet C2 are all connected to the OR circuit through cables; the shutdown trip outlet A3, the shutdown trip outlet B3, and the shutdown trip outlet C3 are all connected to the OR circuit through cables.

[0036] In one embodiment, a three-to-two logic circuit has a first input terminal, a second input terminal, a third input terminal and a first output terminal; the first input terminal is used to input a first generator-transformer group protection shutdown signal; the second input terminal is used to input a second generator-transformer group protection shutdown signal; and the third input terminal is used to input a third generator-transformer group protection shutdown signal.

[0037] In one embodiment, the first output terminal is connected to a generator-transformer group; the generator-transformer group includes a generator, a transformer, and a circuit breaker; one end of the transformer is connected to the generator, and the other end is connected to the circuit breaker, and the circuit breaker is connected to the first output terminal.

[0038] In one embodiment, the OR circuit has a fourth input terminal, a fifth input terminal, a sixth input terminal and a second output terminal.

[0039] In one embodiment, the second output terminal is connected to the shutdown logic of the DCS system.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A generator-transformer group protection start-up DCS system shutdown logic circuit, characterized in that: include: Generator-transformer group protection A device, generator-transformer group protection B device, generator-transformer group protection C device, DCS system shutdown logic; The generator-transformer group protection A device includes a shutdown tripping outlet A1, a shutdown tripping outlet A2, and a shutdown tripping outlet A3; The generator-transformer group protection B device includes a shutdown tripping output B1, a shutdown tripping output B2, and a shutdown tripping output B3; The generator-transformer group protection C device includes a shutdown tripping outlet C1, a shutdown tripping outlet C2, and a shutdown tripping outlet C3; The shutdown trip output A1, the shutdown trip output B1, and the shutdown trip output C1 are connected to the shutdown logic of the DCS system through an OR circuit, and are used to transmit the first generator-transformer group protection shutdown signal; The shutdown trip output A2, the shutdown trip output B2, and the shutdown trip output C2 are connected to the DCS system shutdown logic through an OR circuit, and are used to transmit the second generator-transformer group protection shutdown signal; The shutdown trip output A3, the shutdown trip output B3, and the shutdown trip output C3 are connected to the DCS system shutdown logic through an OR circuit, and are used to transmit the third generator-transformer group protection shutdown signal; The shutdown logic of the DCS system is a three-out-of-two logic circuit, the first generator-transformer group protection shutdown signal, the second generator-transformer group protection shutdown signal, and the third generator-transformer group protection shutdown signal are connected to the input end of the three-out-of-two logic circuit, and the three-out-of-two logic circuit is used to start shutdown.

2. The generator-transformer group protection start-up DCS system shutdown logic circuit according to claim 1 is characterized in that: The shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are connected to the shutdown logic cable of the DCS system through an OR circuit; The shutdown trip outlet A2, the shutdown trip outlet B2, and the shutdown trip outlet C2 are connected to the shutdown logic cable of the DCS system through an OR circuit; The shutdown trip outlet A3, the shutdown trip outlet B3, and the shutdown trip outlet C3 are connected to the shutdown logic cable of the DCS system through an OR circuit.

3. The generator-transformer group protection start-up DCS system shutdown logic circuit according to claim 1 is characterized in that: The shutdown trip outlet A1, the shutdown trip outlet B1, and the shutdown trip outlet C1 are all connected to the OR circuit through cables; The shutdown trip outlet A2, the shutdown trip outlet B2, and the shutdown trip outlet C2 are all connected to the OR circuit through cables; The shutdown trip outlet A3, the shutdown trip outlet B3, and the shutdown trip outlet C3 are all connected to the OR circuit through cables.

4. The generator-transformer group protection start-up DCS system shutdown logic circuit according to claim 1 is characterized in that: The three-to-two logic circuit has a first input terminal, a second input terminal, a third input terminal and a first output terminal; the first input terminal is used to input the first generator-transformer group protection shutdown signal; the second input terminal is used to input the second generator-transformer group protection shutdown signal; the third input terminal is used to input the third generator-transformer group protection shutdown signal.

5. The generator-transformer group protection start-up DCS system shutdown logic circuit according to claim 4 is characterized in that: The first output end is connected to a generator-transformer group; the generator-transformer group includes a generator, a transformer, and a circuit breaker; one end of the transformer is connected to the generator, and the other end is connected to the circuit breaker, and the circuit breaker is connected to the first output end.

6. The generator-transformer group protection start-up DCS system shutdown logic circuit according to claim 1 is characterized in that: The OR circuit has a fourth input terminal, a fifth input terminal, a sixth input terminal and a second output terminal.

7. The generator-transformer group protection start-up DCS system shutdown logic circuit according to claim 6 is characterized in that: The second output terminal is connected to the DCS system shutdown logic.

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