CN112821355A - Generator-transformer unit protection combined-tripping steam turbine loop - Google Patents

Generator-transformer unit protection combined-tripping steam turbine loop Download PDF

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Publication number
CN112821355A
CN112821355A CN202011344722.0A CN202011344722A CN112821355A CN 112821355 A CN112821355 A CN 112821355A CN 202011344722 A CN202011344722 A CN 202011344722A CN 112821355 A CN112821355 A CN 112821355A
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China
Prior art keywords
screen
main valve
generator
group
closing
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CN202011344722.0A
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Chinese (zh)
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CN112821355B (en
Inventor
黄修喜
李泽财
郭汉明
张加林
刘德干
黄文斐
陈韦宪
叶俊锋
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Dongfang Power Plant of Huaneng Hainan Power Generation Co Ltd
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Dongfang Power Plant of Huaneng Hainan Power Generation Co Ltd
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Publication of CN112821355A publication Critical patent/CN112821355A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention discloses a loop of a generator-transformer group protection combined tripping steam turbine, which comprises a generator-transformer group A screen, a B screen and a C screen switch main throttle trip outlet relay, wherein a first generator-transformer group A screen, a B screen and a C screen switch main throttle throw-out pressing plate, a main throttle contact switch and a first ETS system input generator fault signal, a second generator-transformer group A screen, a B screen and a C screen switch main throttle throw-out pressing plate, a main throttle contact switch second ETS system input generator fault signal, a third generator-transformer group A screen, a B screen, a C screen switch main throttle throw-out pressing plate, a main throttle contact switch and a third ETS system input generator fault signal, and an ETS system input generator fault three-to-two logic circuit; the circuit identifies the faults of the A screen, the B screen and the C screen of the generator-transformer group through the two-out-of-three logic circuit, and can reduce fault misjudgment. The invention has the beneficial effects that: the electric trip protection device has the advantages of fully utilizing original equipment, being exquisite in conception, simple in design and high in reliability, improving the safety and reliability of electric trip protection of the generator set and being capable of being widely popularized and applied.

Description

Generator-transformer unit protection combined-tripping steam turbine loop
Technical Field
The invention relates to a generator protection circuit, in particular to a loop of a generator-transformer unit protection combined-tripping steam turbine.
Background
In a power plant, the large mechanical-furnace-electric interlocking protection is the interlocking protection set on the basis of boiler protection, steam turbine protection and generator-transformer group protection. When one of the three main machines can not work normally, the other two main machines can be safely shut down, and the function of protecting equipment is achieved. If the large interlocking protection can not operate correctly, serious accidents of damage of boiler, steam turbine and generator transformer set equipment can be caused. When an electrical system has a fault, a tripping signal is sent to a turbine Emergency Tripping System (ETS) through a generator-transformer protection to interlock a main valve and then interlock a boiler Main Fuel Tripping (MFT), and the protection is generally called as 'electric trip'. At present, the loop forming mode of the 'electric trip' protection mainly comprises: the first method is as follows: after 1 path of 'main valve closing' signals of three screens of the generator set A, B, C are connected in parallel, the signals are sent to the ETS, and the ETS is only accessed through 1 channel to form a 'generator fault' tripping condition, as shown in figure 1; the second method comprises the following steps: each 1-path 'main valve closing' signal of three screens of the generator set A, B, C is respectively sent to the ETS, and the ETS is connected through 3 channels, and a 'generator fault' tripping condition is formed after 'three is one', as shown in figure 2; the third method comprises the following steps: after being connected in parallel with the 1 st path and the 2 nd path of main valve closing signals of the screen C of the generator-transformer group, the 1 st path of main valve closing signals of the generator-transformer group A, B are respectively sent to the ETS, the ETS is connected through 2 channels, and after the two paths are one, the tripping condition of generator fault is formed, as shown in figure 3.
The prior art at present has the following defects:
and the generator-transformer unit protection combined tripping steam turbine loop has low reliability. In the first mode, the second mode or the third mode, single faults such as relay contact faults, circuit disconnection, circuit short circuit, ETS channels and the like can cause the misoperation or the failure of the generator-transformer protection combined jump steam turbine, and even serious accidents such as overspeed of a steam turbine set and the like.
Disclosure of Invention
The invention is designed to solve the technical problems and provides a circuit of a generator-transformer unit protection combined-tripping steam turbine.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a circuit of a generator-transformer unit protection combined tripping steam turbine comprises a generator-transformer unit A screen, a generator-transformer unit B screen, a generator-transformer unit C screen and a steam turbine emergency tripping system;
the generator set A screen comprises a first generator set A screen closing main valve on-off pressing plate and a first generator set A screen closing main valve contact KA1The second generator transformer group A screen closing main valve opening and closing pressing plate and the second generator transformer group A screen closing main valve contact KA2A third generator transformer group A screen closing main valve on-off pressing plate and a third generator transformer group A screen closing main valve contact KA3And a generator-transformer group A screen-closing main valve tripping outlet relay;
the generator set B screen comprises a first generator set B screen closing main valve on-off pressing plate and a first generator set B screen closing main valve contact KB1A second generation and transformation group B screen closing main valve on-off pressing plate and a second generation and transformation group B screen closing main valve contact KB2A third generator transformer group B screen closing main valve on-off pressing plate and a third generator transformer group B screen closing main valve contact KB3And a generator-transformer group B screen closing main valve tripping outlet relay;
the generator set C screen comprisesFirst pitch group C screen closes main valve and throws and move back clamp plate and first pitch group C screen main valve KC1The second generation and transformation group C screen closing main valve opening and closing pressing plate and the second generation and transformation group C screen main valve KC2A third generation and transformation group C screen closing main valve opening and closing pressing plate and a third generation and transformation group C screen main valve KC3The power generation and transformation group C screen closes the main valve trip outlet relay;
the turbine emergency trip system comprises an ETS system input value, a generator fault two-out-of-three logic circuit, a generator fault signal output module and a first ETS system input value generator fault access end DI4And a second ETS system input generator fault access end DI5And a third ETS system input generator fault access end DI6；
One end of the first generating set A screen closing main valve opening and closing pressing plate and a first generating set A screen closing main valve contact KA1One end of the two ends are connected;
one end of the second generator-transformer group A screen closing main valve opening and closing pressing plate and a second generator-transformer group A screen closing main valve contact KA2One end of the two ends are connected;
one end of a third generator-transformer group A screen closing main valve opening and closing pressing plate and a third generator-transformer group A screen closing main valve contact KA3One end of the two ends are connected;
one end of the first step-up group B screen closing main valve on-off pressing plate and a first step-up group B screen closing main valve contact KB1One end of the two ends are connected;
one end of the second generator-transformer group B screen closing main valve on-off pressing plate and a second generator-transformer group B screen closing main valve contact KB2One end of the two ends are connected;
one end of a third generator-transformer group B screen closing main valve on-off pressing plate and a third generator-transformer group B screen closing main valve contact KB3One end of the two ends are connected;
one end of the first step-up group C screen closing main valve on-off pressing plate and a first step-up group C screen closing main valve contact KC1One end of the two ends are connected;
one end of the second generator-transformer group C screen closing main valve opening and closing pressing plate and a second generator-transformer group C screen closing main valve contact KC2One end of the two ends are connected;
third generation group C screen closing main steamOne end of the door throwing and withdrawing pressure plate and a third generator set C screen closing main valve contact KC3One end of the two ends are connected;
first generating set A screen closing main valve contact KA1The other end of the first generator set B screen switch main valve contact KB1The other end of the first generator set C screen main throttle valve KC1And the other end of the first ETS system open-volume generator fault access end DI4The first binding post is connected;
the other end of the first generator-transformer group A screen closing main valve opening and closing pressing plate, the other end of the first generator-transformer group B screen closing main valve opening and closing pressing plate, the other end of the first generator-transformer group C screen closing main valve opening and closing pressing plate and a first ETS system input generator fault access end DI4The second binding post is connected;
second generation group A screen closing main valve contact KA2The other end of the first generator set B screen switch main valve contact KB2The other end of the first generator-transformer group C screen main throttle valve KC2And the other end of the second ETS system open-volume generator fault access end DI5The first binding post is connected;
the other end of the second generator-transformer group A screen closing main valve opening and closing pressing plate, the other end of the second generator-transformer group B screen closing main valve opening and closing pressing plate, the other end of the second generator-transformer group C screen closing main valve opening and closing pressing plate and a second ETS system input generator fault access end DI5The second binding post is connected;
third generation group A screen closing main valve contact KA3The other end of the first power generation and transformation group B and the third power generation and transformation group B close the main valve contact KB3The other end of the main valve K and a third generator-transformer group C screen main valve KC3And the other end of the third ETS system open-volume generator fault access end DI6The first binding post is connected;
the other end of the third generation-transformation group A screen closing main valve opening and closing pressing plate, the other end of the third generation-transformation group B screen closing main valve opening and closing pressing plate, the other end of the third generation-transformation group C screen closing main valve opening and closing pressing plate and a third ETS system input power generator fault access end DI6The second binding post is connected;
the fault signal of the first ETS system input generator, the fault signal of the second ETS system input generator and the fault signal of the third ETS system input generator are connected with the input end of the ETS system input generator fault two-out-of-three logic circuit, and the output end of the ETS system input generator fault two-out-of-three logic circuit is connected with the input end of the generator fault signal output module; the output end of the generator fault signal output module is connected with a driving loop for controlling the closing of the main steam valve and controlling the closing of the main steam valve;
a panel-closing main valve tripping outlet relay of the generator-transformer group A simultaneously controls a panel-closing main valve contact K of the first generator-transformer group AA1、KA2、KA3Closing and opening of;
the relay of the trip outlet of the main valve of the switching group B screen switch controls the contact K of the main valve of the first switching group B screen switch at the same timeB1、KB2、KB3Closing and opening of;
the relay of the trip outlet of the main throttle of the power generation and transformation group C screen switch controls the contact K of the main throttle of the first power generation and transformation group C screen switchC1、KC2、KC3To be closed and opened.
The loop of the generator-transformer unit protection combined-tripping steam turbine also comprises two first main throttle valve signal secondary cables;
the first generator transformer group A screen closing main throttle valve switching pressing plate, the first generator transformer group B screen closing main throttle valve switching pressing plate and the first generator transformer group C screen closing main throttle valve switching pressing plate are connected with a first ETS system switching-in generator fault access end DI through a first switching main throttle valve signal secondary cable4The first binding post is connected;
first generating set A screen closing main valve contact KA1And a first generating set B screen switch main valve contact KB1And a first generator set C screen main throttle valve KC1Through another first switch main valve signal secondary cable and a first ETS system switch-in generator fault access end DI4Is connected with the second binding post.
The loop of the generator-transformer unit for protecting the combined tripping steam turbine further comprises two secondary cables for switching main throttle signals;
second generation group A screen closing main valve contact KA2Second, secondGeneration and transformation group B screen closing main valve contact KB2And a second generator-transformer group C screen main valve contact KC2The secondary cable is connected with a first wiring terminal of a fault access end DI5 of the second ETS system input generator through a second switch main throttle signal secondary cable;
a second generation and transformation group A screen-closing main valve on-off pressing plate, a second generation and transformation group B screen-closing main valve on-off pressing plate and a second generation and transformation group C screen-closing main valve on-off pressing plate pass through another second path of main valve-closing signal secondary cable and a second ETS system switch-in generator fault access end DI5Is connected with the second binding post.
The loop of the generator-transformer unit for protecting the combined jump steam turbine further comprises two third switch main throttle signal secondary cables;
third generation group A screen closing main valve contact KA3And a third generator set B screen closing main valve contact KB3And a third generator set C screen main valve contact KC3The fault access end DI of the generator is connected with the third ETS system through a third switch main throttle signal secondary cable6The first binding post is connected;
a third generation transformation group A screen-closing main throttle valve on-off pressing plate, a third generation transformation group B screen-closing main throttle valve on-off pressing plate and a third generation transformation group C screen-closing main throttle valve on-off pressing plate pass through another third switch main throttle valve signal secondary cable and a third ETS system switch-in generator fault access end DI6Is connected with the second binding post.
The generator-transformer unit protection combined-tripping steam turbine loop is characterized in that a generator-transformer unit A screen closing main valve tripping outlet relay, a generator-transformer unit B screen closing main valve tripping outlet relay and a generator-transformer unit C screen closing main valve tripping outlet relay are all dynamic contacts, the dynamic contacts are disconnected when a coil is not electrified, and the dynamic contacts are closed after the coil is electrified.
In actual operation, when the contact of any one of the main valve trip outlet relay for the power generation and transformation group A, the main valve trip outlet relay for the power generation and transformation group B and the main valve trip outlet relay for the power generation and transformation group C is in fault, the loop wiring is loose, broken, the loop is in short circuit, and an ETS sampling channel is in fault, a fault signal of the power generator cannot be mistakenly sent or refused, so that the safety and reliability of the electric trip protection of the power generator set are greatly improved.
The invention has the advantages that the open-volume generator fault two-out-of-three logic circuit of the ETS system is utilized, when any one of the contact faults of the generator set A screen-closed main valve trip outlet relay, the generator set B screen-closed main valve trip outlet relay and the generator set C screen-closed main valve trip outlet relay, the circuit wiring is loose, the circuit wiring is broken, the circuit short circuit occurs, and the ETS sampling channel fault does not occur or refuse to send out a generator fault signal, thereby greatly improving the safety and reliability of the generator set electric trip protection.
Drawings
Fig. 1 is a schematic diagram of a first prior art electrical trip protection circuit forming method;
fig. 2 is a schematic diagram illustrating a second prior art trip protection circuit forming method;
fig. 3 is a schematic diagram illustrating a third prior art trip protection circuit forming method;
fig. 4 is a schematic structural diagram of the present invention.
Wherein, 5 is a connecting terminal, 9 is a first ETS system input generator fault signal, 10 is a first generator group A screen closing main throttle valve switching pressing plate, 11 is a first generator group B screen closing main throttle valve switching pressing plate, 12 is a first generator group C screen closing main throttle valve switching pressing plate, 13 is a first switch main throttle valve signal secondary cable, 17 is a second ETS system input generator fault signal, 18 is a generator group A screen closing main throttle valve tripping outlet relay, 19 is a generator group B screen closing main throttle valve tripping outlet relay, 20 is a generator group C screen closing main throttle valve tripping outlet relay, 21 is a second generator group A screen closing main throttle valve switching pressing plate, 22 is a second generator group B screen closing main throttle valve switching pressing plate, 23 is a second generator group C screen closing main throttle valve switching pressing plate, 24 is a second switch main throttle valve signal secondary cable, 25 is an ETS system input generator fault three-level logic circuit and a second level logic circuit is taken, 26 is a generator fault signal output module, 30 is a third ETS system input generator fault signal, 31 is a third generator-transformer group A screen-closing main throttle opening and closing pressing plate, 32 is a third generator-transformer group B screen-closing main throttle opening and closing pressing plate, 33 is a third generator-transformer group C screen-closing main throttle opening and closing pressing plate, and 34 is a third switch main throttle signal secondary cable.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 4, the loop of the generator-transformer unit protection combined tripping steam turbine of the present invention includes a generator-transformer unit a panel, a generator-transformer unit B panel, a generator-transformer unit C panel, and a steam turbine emergency tripping system;
the generator set A screen comprises a first generator set A screen closing main valve on-off pressing plate 10 and a first generator set A screen closing main valve contact KA1A second generation and transformation group A screen closing main valve on-off pressing plate 21 and a second generation and transformation group A screen closing main valve contact KA2A third generator-transformer group A screen closing main valve on-off pressing plate 31 and a third generator-transformer group A screen closing main valve contact KA3And the generator-transformer group A closes the main valve trip outlet relay 18;
the generator-transformer group B screen comprises a first generator-transformer group B screen closing main valve on-off pressing plate 11 and a first generator-transformer group B screen closing main valve contact KB1A second generation and transformation group B screen closing main valve on-off pressing plate 22 and a second generation and transformation group B screen closing main valve contact KB2A third generation and transformation group B screen closing main valve on-off pressing plate 32, and a third generation and transformation group B screen closing main valve contact KB3And the generator-transformer group B screen closes the main valve trip outlet relay 19;
the generator set C screen comprises a first generator set C screen closing main valve on-off pressing plate 12 and a first generator set C screen main valve contact KC1A second generation and transformation group C screen closing main valve opening and closing pressing plate 23 and a second generation and transformation group C screen main valve contact KC2A third generator-transformer group C screen closing main valve on-off pressing plate 33, and a third generator-transformer group C screen main valve contact KC3The power generation and transformation group C screen-closing main valve tripping outlet relay 20;
the turbine emergency trip system comprises ETS system input generator fault signals 9, 17 and 30, a generator fault two-out-of-three logic circuit 25, a generator fault signal output module 26 and a first ETS system input generator fault access end DI4And a second ETS system input generator fault access end DI5And third ETS System Start-inFault access terminal DI of volume generator6；
One end of a first generating set A screen closing main valve on-off pressing plate 10 and a first generating set A screen closing main valve contact KA1One end of the two ends are connected;
one end of a second generator-transformer group A screen closing main valve on-off pressing plate 21 and a second generator-transformer group A screen closing main valve contact KA2One end of the two ends are connected;
one end of a third generator-transformer group A screen closing main valve on-off pressing plate 31 and a third generator-transformer group A screen closing main valve contact KA3One end of the two ends are connected;
one end of a first step-up group B screen closing main valve on-off pressing plate 11 and a first step-up group B screen closing main valve contact KB1One end of the two ends are connected;
one end of the second generator-transformer group B screen closing main valve on-off pressing plate 22 and a second generator-transformer group B screen closing main valve contact KB2One end of the two ends are connected;
one end of a third generation-transformation group B screen closing main valve on-off pressing plate 32 and a third generation-transformation group B screen closing main valve contact KB3One end of the two ends are connected;
one end of a first step-up group C screen closing main valve on-off pressing plate 12 and a first step-up group C screen closing main valve contact KC1One end of the two ends are connected;
one end of the second generator-transformer group C screen closing main valve on-off pressing plate 23 and a second generator-transformer group C screen closing main valve contact KC2One end of the two ends are connected;
one end of a third generator-transformer group C screen closing main valve on-off pressing plate 33 and a third generator-transformer group C screen closing main valve contact KC3One end of the two ends are connected;
first generating set A screen closing main valve contact KA1The other end of the first generator set B screen switch main valve contact KB1The other end of the first generating and transforming set C screen main valve contact KC1And the other end of the first ETS system open-volume generator fault access end DI4The first binding post is connected;
the other end of a first step-up group A screen closing main valve on-off pressing plate 10, the other end of a first step-up group B screen closing main valve on-off pressing plate 11 and a first step-up group C screen closing main valve on-off pressureThe other end of plate 12 is connected to a first ETS system input generator fault access terminal DI4The second binding post is connected;
second generation group A screen closing main valve contact KA2The other end of the first generator set B screen switch main valve contact KB2The other end of the first generator set and a main valve contact K of a second generator set C screenC2And the other end of the second ETS system open-volume generator fault access end DI5The first binding post is connected;
the other end of a second generation-transformation group A screen-closing main valve on-off pressing plate 21, the other end of a second generation-transformation group B screen-closing main valve on-off pressing plate 22, the other end of a second generation-transformation group C screen-closing main valve on-off pressing plate 23 and a second ETS system input generator fault access end DI5The second binding post is connected;
third generation group A screen closing main valve contact KA3The other end of the first power generation and transformation group B and the third power generation and transformation group B close the main valve contact KB3The other end of the C screen main valve contact K of the third generator-transformer groupC3And the other end of the third ETS system open-volume generator fault access end DI6The first binding post is connected;
the other end of a third generation-transformation group A screen-closing main valve on-off pressing plate 31, the other end of a third generation-transformation group B screen-closing main valve on-off pressing plate 32, the other end of a third generation-transformation group C screen-closing main valve on-off pressing plate 33 and a third ETS system input power generator fault access end DI6The second binding post is connected;
a first ETS system input generator fault signal 9, a second ETS system input generator fault signal 17 and a third ETS system input generator fault signal 30 are connected with the input end of an ETS system input generator fault three-in-two logic circuit 25, and the output end of the ETS system input generator fault three-in-two logic circuit 25 is connected with the input end of a generator fault signal output module 26; the output end of the generator fault signal output module 26 is connected with a driving loop for controlling the closing of the main throttle valve and controlling the closing of the main throttle valve;
the generator transformer group A screen closing main valve tripping outlet relay 18 simultaneously controls the first generator transformer group A screen closing main valve contact KA1、KA2、KA3Closing and opening of;
the generator transformer group B screen closing main valve tripping outlet relay 19 simultaneously controls the first generator transformer group B screen closing main valve contact KB1、KB2、KB3Closing and opening of;
the power generation and transformation group C screen closing main valve tripping outlet relay 20 simultaneously controls the first power generation and transformation group C screen closing main valve contact KC1、KC2、KC3To be closed and opened.
The loop of the generator-transformer unit protection combined-tripping steam turbine further comprises two first main throttle valve signal secondary cables 13;
first generating set A screen closing main valve contact KA1And a first generating set B screen switch main valve contact KB1And a first generating set C screen main valve contact KC1Through a first switch main throttle signal secondary cable 13 and a first ETS system switch-in generator fault access end DI4The first binding post is connected;
a first generator transformer group A screen closing main valve on-off pressing plate 10, a first generator transformer group B screen closing main valve on-off pressing plate 11 and a first generator transformer group C screen closing main valve on-off pressing plate 12 pass through another first path closing main valve signal secondary cable 13 and a first ETS system input generator fault access end DI4Is connected with the second binding post.
The loop of the generator-transformer unit protection combined-tripping steam turbine also comprises two second gateway main throttle signal secondary cables 24;
second generation group A screen closing main valve contact KA2And a second power generation and transformation group B screen closing main valve contact KB2And a second generator-transformer group C screen main valve contact KC2Through a second switch main throttle signal secondary cable 24 and a second ETS system open input generator fault access end DI5The first binding post is connected;
a second generation and transformation group A screen closing main valve on-off pressing plate 21, a second generation and transformation group B screen closing main valve on-off pressing plate 22 and a second generation and transformation group C screen closing main valve on-off pressing plate 23 pass through another second path closing main valve signal secondary cable 24 and a second ETS system input generator fault access end DI5Second of (2)The binding posts are connected.
The loop of the generator-transformer unit for protecting the combined jump steam turbine further comprises two third switch main throttle signal secondary cables 34;
third generation group A screen closing main valve contact KA3And a third generator set B screen closing main valve contact KB3And a third generator set C screen main valve contact KC3Through a third switch main throttle signal secondary cable 34 and a third ETS system switching-in quantity generator fault access end DI6The first binding post is connected;
a third generator-transformer group A screen-closing main valve on-off pressing plate 31, a third generator-transformer group B screen-closing main valve on-off pressing plate 32 and a third generator-transformer group C screen-closing main valve on-off pressing plate 33 pass through another third switch main valve signal secondary cable 34 and a third ETS system input generator fault access end DI6Is connected with the second binding post.
The generator-transformer unit protection combined-tripping steam turbine loop is characterized in that a generator-transformer unit A screen closing main valve tripping outlet relay 18, a generator-transformer unit B screen closing main valve tripping outlet relay 19 and a generator-transformer unit C screen closing main valve tripping outlet relay 20 are all movable contact type contacts, the movable contact type contacts are disconnected when a coil is not electrified, and the movable contact type contacts are closed after the coil is electrified.
In actual operation, when any one of the contact faults of the generator-transformer group A screen closing main valve trip outlet relay 18, the generator-transformer group B screen closing main valve trip outlet relay 19 and the generator-transformer group C screen closing main valve trip outlet relay 20, the loop wiring is loose, broken, the loop is short-circuited, and when an ETS sampling channel is in fault, a generator fault signal cannot be mistakenly sent or refused, so that the safety and reliability of the generator set electric trip protection are greatly improved.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products similar or identical to the present invention, which can be obtained by anyone based on the teaching of the present invention, fall within the protection scope of the present invention.

Claims (5)

1. A circuit of a generator-transformer unit protection combined tripping steam turbine comprises a generator-transformer unit A screen, a generator-transformer unit B screen, a generator-transformer unit C screen and a steam turbine emergency tripping system; the method is characterized in that:
the generator set A screen comprises a first generator set A screen closing main valve on-off pressing plate (10) and a first generator set A screen closing main valve contact (K)A1) A main valve opening and closing pressing plate (21) of a second generator-transformer group A screen closing main valve and a main valve contact (K) of a second generator-transformer group A screen closing main valveA2) A third generation and transformation group A screen closing main valve opening and closing pressing plate (31) and a third generation and transformation group A screen closing main valve contact (K)A3) And a generator-transformer group A screen-closing main valve tripping outlet relay (18);
the generator set B screen comprises a first generator set B screen closing main valve on-off pressing plate (11) and a first generator set B screen closing main valve contact (K)B1) A second generation and transformation group B screen closing main valve on-off pressing plate (22) and a second generation and transformation group B screen closing main valve contact (K)B2) A third generation and transformation group B screen closing main valve on-off pressing plate (32) and a third generation and transformation group B screen closing main valve contact (K)B3) And a generator-transformer group B screen-closing main valve tripping outlet relay (19);
the generator set C screen comprises a first generator set C screen closing main valve opening and closing pressing plate (12) and a first generator set C screen main valve contact (K)C1) A second generation and transformation group C screen closing main valve opening and closing pressing plate (23) and a second generation and transformation group C screen main valve contact (K)C2) A third generation and transformation group C screen closing main valve opening and closing pressing plate (33) and a third generation and transformation group C screen main valve contact (K)C3) The power generation and transformation group C screen-closing main valve tripping outlet relay (20);
the turbine emergency tripping system comprises ETS system input generator fault signals (9, 17 and 30), a generator fault two-out-of-three logic circuit (25), a generator fault signal output module (26) and a first ETS system input generator fault access end (DI)4) And a second ETS system input generator fault access terminal (DI)5) And a third ETS system input generator fault access terminal (DI)6)；
One end of a first generating set A screen closing main valve on-off pressing plate (10) and a first generating set A screen closing main valve contact (K)A1) One end of the two ends are connected;
one end of a second generator-transformer group A screen closing main valve opening and closing pressing plate (21) and a second generator-transformer group A screen closing main valve contact (K)A2) One end of the two ends are connected;
one end of a third generator-transformer group A screen closing main valve opening and closing pressing plate (31) and a third generator-transformer group A screen closing main valve contact (K)A3) One end of the two ends are connected;
one end of a first step-up group B screen closing main valve on-off pressing plate (11) and a first step-up group B screen closing main valve contact (K)B1) One end of the two ends are connected;
one end of a second variable group B screen closing main valve opening and closing pressing plate (22) and a second variable group B screen closing main valve contact (K)B2) One end of the two ends are connected;
one end of a third generation-transformation group B screen closing main valve opening and closing pressing plate (32) and a third generation-transformation group B screen closing main valve contact (K)B3) One end of the two ends are connected;
one end of a first step-up group C screen closing main valve on-off pressing plate (12) and a first step-up group C screen closing main valve contact (K)C1) One end of the two ends are connected;
one end of a second variable group C screen closing main valve opening and closing pressing plate (23) and a second variable group C screen closing main valve contact (K)C2) One end of the two ends are connected;
one end of a third variable group C screen closing main valve opening and closing pressing plate (33) and a third variable group C screen closing main valve contact (K)C3) One end of the two ends are connected;
first generating set A screen closing main valve contact (K)A1) Another end of the first generator set B screen switch main valve contact (K)B1) And the other end of the first generator set C screen main valve contact (K)C1) And the other end of the first ETS system open-volume generator fault access terminal (DI)4) The first binding post is connected;
the other end of a first generator-transformer group A screen closing main valve on-off pressing plate (10), the other end of a first generator-transformer group B screen closing main valve on-off pressing plate (11), the other end of a first generator-transformer group C screen closing main valve on-off pressing plate (12) and a fault access end (DI) of a first ETS system input generator4) The second binding post is connected;
second generation group A screen closing main valve contact (K)A2) The other end of the first generator set B screen switch main valve contact (K)B2) And the other end of the second generator set C screen main valve contact (K)C2) And the other end of the second ETS systemOpen-load generator fault access (DI)5) The first binding post is connected;
the other end of a second generator-transformer group A screen-closing main valve on-off pressing plate (21), the other end of a second generator-transformer group B screen-closing main valve on-off pressing plate (22), the other end of a second generator-transformer group C screen-closing main valve on-off pressing plate (23) and a second ETS system input generator fault access end (DI)5) The second binding post is connected;
third generation group A screen closing main valve contact (K)A3) The other end of the switch and a third switching group B screen switch main valve contact (K)B3) And the other end of the third generator set C screen main valve contact (K)C3) And the other end of the third ETS system open-volume generator fault access terminal (DI)6) The first binding post is connected;
the other end of a third generation-transformation group A screen-closing main valve on-off pressing plate (31), the other end of a third generation-transformation group B screen-closing main valve on-off pressing plate (32), the other end of a third generation-transformation group C screen-closing main valve on-off pressing plate (33) and a third ETS system input power generator fault access end (DI)6) The second binding post is connected;
a first ETS system input amount generator fault signal (9), a second ETS system input amount generator fault signal (17) and a third ETS system input amount generator fault signal (30) are connected with the input end of an ETS system input amount generator fault two-out-of-three logic circuit (25), and the output end of the ETS system input amount generator fault two-out-of-three logic circuit (25) is connected with the input end of a generator fault signal output module (26); the output end of the generator fault signal output module (26) is connected with a driving loop for controlling the closing of the main steam valve and controlling the closing of the main steam valve;
the power generation group A screen closing main valve tripping outlet relay (18) controls the first power generation group A screen closing main valve contact (K)A1、KA2、KA3) Closing and opening of;
the power generation group B screen closing main valve tripping outlet relay (19) controls the first power generation group B screen closing main valve contact (K)B1、KB2、KB3) Closing and opening of;
generator transformer group C screen closing main valve tripping outlet relay(20) Simultaneously controlling a first generator group C screen to close a main valve contact (K)C1、KC2、KC3) To be closed and opened.
2. The circuit of a generator-transformer-group protection combined-jump steam turbine according to claim 1, characterized in that: the device also comprises two first main throttle valve signal secondary cables (13);
first generating set A screen closing main valve contact (K)A1) And the first generating set B screen switch main valve contact (K)B1) And the first transforming group C screen main valve contact (K)C1) Through a first switch main valve signal secondary cable (13) and a first ETS system switch-in generator fault access end (DI)4) The first binding post is connected;
a first pitch group A screen closing main valve on-off pressing plate (10), a first pitch group B screen closing main valve on-off pressing plate (11) and a first pitch group C screen closing main valve on-off pressing plate (12) pass through another first path closing main valve signal secondary cable (13) and a first ETS system input generator fault access end (DI)4) Is connected with the second binding post.
3. The circuit of a generator-transformer-group protection combined-jump steam turbine according to claim 1, characterized in that: the device also comprises two secondary cables (24) for the signals of the main valve of the second gateway;
second generation group A screen closing main valve contact (K)A2) And the second generating and transforming group B screen closing main valve contact (K)B2) And the second generator set C screen main valve contact (K)C2) Through a second switch main throttle signal secondary cable (24) and a second ETS system open input generator fault access end (DI)5) The first binding post is connected;
a second generation and transformation group A screen-closing main valve on-off pressing plate (21), a second generation and transformation group B screen-closing main valve on-off pressing plate (22) and a second generation and transformation group C screen-closing main valve on-off pressing plate (23) pass through another second path of main valve-closing signal secondary cable (24) and a second ETS system input generator fault access end (DI)5) Is connected with the second binding post.
4. The circuit of a generator-transformer-group protection combined-jump steam turbine according to claim 1, characterized in that: the device also comprises two third switch main throttle signal secondary cables (34);
third generation group A screen closing main valve contact (K)A3) And the third generation group B screen closing main valve contact (K)B3) And the third generation group C screen main valve contact (K)C3) The fault access end (DI) of the generator is connected with the third ETS system through a third switch main throttle signal secondary cable (34)6) The first binding post is connected;
a third generation transformation group A screen-closing main valve opening and closing pressing plate (31), a third generation transformation group B screen-closing main valve opening and closing pressing plate (32) and a third generation transformation group C screen-closing main valve opening and closing pressing plate (33) pass through another third switch main valve signal secondary cable (34) and a third ETS system opening input power generator fault access end (DI system)6) Is connected with the second binding post.
5. The circuit of a generator-transformer-group protection combined-jump steam turbine according to claim 1, characterized in that: and the power generation and transformation group A screen closing main valve trip outlet relay (18), the power generation and transformation group B screen closing main valve trip outlet relay (19) and the power generation and transformation group C screen closing main valve trip outlet relay (20) are all movable contact type contacts, the movable contact type contacts are disconnected when the coil is not electrified, and the movable contact type contacts are closed after the coil is electrified.
CN202011344722.0A 2020-11-25 2020-11-25 Generator-transformer unit protection combined-tripping steam turbine loop Active CN112821355B (en)

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