CN110707753B - Synchronous device closing loop for three-half main wiring - Google Patents
Synchronous device closing loop for three-half main wiring Download PDFInfo
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- CN110707753B CN110707753B CN201910899019.7A CN201910899019A CN110707753B CN 110707753 B CN110707753 B CN 110707753B CN 201910899019 A CN201910899019 A CN 201910899019A CN 110707753 B CN110707753 B CN 110707753B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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Abstract
The invention particularly relates to a synchronous device closing loop for three-half main wiring, a transfer switch KK is additionally arranged on an automatic quasi-synchronous screen of a generator, the transfer switch KK is arranged in the automatic quasi-synchronous closing loop of the generator, when an operator performs synchronous grid-connection operation of a circuit breaker, the transfer switch KK is arranged at a synchronous closing position, namely, 1 node, 2 node and 3 node and 4 node on the transfer switch KK are closed, 5 node and 6 node on the transfer switch KK are opened, a synchronous closing relay TJJ normally operates, a closing checking function is realized, the transfer switch KK is arranged at a non-pressing closing position when the operator performs circuit breaker closing operation, 1 node, 2 node, 3 node and 4 node on the transfer switch KK are opened, 5 node and 6 node on the transfer switch KK are closed, the transfer switch KK blocks induced voltage on the system side, and the synchronous closing relay cannot be closed due to error closing of induced voltage.
Description
Technical Field
The invention belongs to the technical field of synchronous grid connection of power generators of power plants, and particularly relates to a synchronous device switching-on loop for three-half main wiring.
Background
Aiming at the problem that the non-synchronous closing fault phenomenon occurs in the automatic quasi-synchronous closing process of the power system generator, most of the problems are the synchronous device, but the problem of a control loop is also solved, the reliability of the synchronous device is often concerned, the optimization of a closing control loop is neglected, and measures are not taken from the aspect of the control loop to prevent misoperation or error closing.
The synchronous locking device is an indispensable security measure of an automatic quasi-synchronous device of the generator and is used for reliably avoiding asynchronous parallel accidents of the generator. The common synchronous locking device consists of a synchronous locking relay and a synchronous locking loop, but the common synchronous locking device cannot perform loop closing operation for the 3/2 main wiring due to induced voltage.
Disclosure of Invention
In view of the above, the invention provides a synchronous device closing loop for three-half main wiring, which aims to solve the problem that a synchronous locking device of an automatic quasi-synchronous device of a generator cannot perform loop closing and closing operation on a 3/2 main wiring breaker under the influence of induced voltage.
The technical scheme adopted by the invention is as follows:
a synchronous device switching-on loop for three-half main wiring is characterized in that a transfer switch KK is additionally arranged on an automatic quasi-synchronous screen of a generator, the transfer switch KK is arranged in the automatic quasi-synchronous switching-on loop of the generator, the transfer switch KK comprises synchronous switching-on detection and non-voltage switching-on detection, normally closed 1 and 2 nodes and normally closed 3 and 4 nodes of the synchronous switching-on detection position are connected in series on the system voltage side of a synchronous latching relay TJJ, and normally open 5 and 6 nodes of the non-voltage switching-on detection position are connected in series with an outlet node of the synchronous latching relay TJJ; the method comprises the following steps:
the switching switch KK is positioned at a synchronous closing position, nodes 1 and 2, and nodes 3 and 4 on the switching switch KK are closed, nodes 5 and 6 on the switching switch KK are opened, an operator performs synchronous grid-connected operation of the circuit breaker, and the synchronous locking relay TJJ operates normally to realize locking detection;
the change-over switch KK is in examining no pressfitting floodgate position, 1, 2 node and 3, 4 node disconnection on the change-over switch KK, 5, 6 node on the change-over switch KK are closed, and operating personnel carries out the synchronous grid-connected operation of circuit breaker, change-over switch KK will synchronous latching relay TJJ voltage side induced voltage block, and synchronous latching relay TJJ can not be because of the misoperation-preventive latch of induced voltage.
Preferably, a special test terminal is additionally arranged on the synchronous locking relay TJJ, a secondary loop terminal of a voltage transformer in an automatic quasi-synchronous screen of the generator is replaced by the test terminal, and an operator can break the test terminal connecting piece to block the induced voltage of the synchronous locking relay TJJ in the process of closing the ring and closing the gate.
Preferably, the synchronous latching relay TJJ and the automatic quasi-synchronous device are connected in parallel in an ac voltage loop, specifically:
one path of outgoing line of the wiring terminal J3:3 on the automatic quasi-synchronization device passes through the wiring terminal 1D of the cabinet: 29 is connected to 2 nodes of synchronous latching relay TJJ, and another way is connected to 11 nodes of alternating current selective relay DTK12, 3 nodes of alternating current selective relay DTK12 are connected to main transformer high-voltage side PT terminal box, wiring terminal J3:1 on the automatic quasi-synchronous device lead-out wire of all the way passes through cabinet wiring terminal 1D:26 connect in change over switch KK's 2 node, another way is connected in the 9 nodes of exchanging selective relay DTK12, exchanging selective relay DTK 12's 1 node is connected on 330kVI female PT terminal box, wiring terminal J3:4's on the automatic quasi-synchronization device lead-out wire is all the way through cabinet wiring terminal 1D:30 is connected to the 4 nodes of the synchronous locking relay TJJ, the other path is connected to the 12 nodes of the alternating current selective relay DTK12, the 4 nodes of the alternating current selective relay DTK12 are connected to the main transformer high-voltage side PT terminal box, and one path of outgoing lines of the wiring terminals J3:2 on the automatic quasi-synchronous device passes through the wiring terminal 1D of the cabinet: 28 is connected with the 4 node of the change-over switch KK, the other path is connected with the 10 node of the alternating current selective point relay DTK12, and the 2 node of the alternating current selective point relay DTK12 is connected with the 330kVI female PT terminal box.
Preferably, the two ends of the alternating current selective point relay DTK12 are connected with an alternating current selective point relay DTK22 in parallel, and a third outgoing line of the wiring terminal J3:1 on the automatic quasi-synchronization device passes through the wiring terminal 1D of the cabinet: 25 is connected to the 9 nodes of the alternating current selective relay DTK22, the 1 node of the alternating current selective relay DTK22 is connected to a 330kV residual 1 line PT terminal box, and a third outgoing line of a wiring terminal J3:2 on the automatic quasi-synchronization device passes through a cabinet wiring terminal 1D:27 are connected to 10 nodes of an alternating current selective relay DTK22, and 2 nodes of the alternating current selective relay DTK22 are connected to a 330kV residual 1 line PT terminal box.
Preferably, the synchronous latching relay TJJ and the automatic quasi-synchronous device are connected in series on a branch of the dc control loop, specifically: the wiring terminal J2:8 outgoing line of the automatic quasi-synchronization device is connected to the 9 node of the direct current selective point relay DTK11, the wiring terminal J2:9 outgoing line of the automatic quasi-synchronization device is connected to the 9 node of the direct current selective point relay DTK21, the wiring terminal J2:8 outgoing line, the wiring terminal J2:9 outgoing line and the wiring terminal J1:7 outgoing line of the automatic quasi-synchronization device are arranged in parallel, a pressing brake-free button JWYHA is connected in series between the wiring terminal J2:6 and the wiring terminal J2:7 of the automatic quasi-synchronization device, and the wiring terminal J3:6 outgoing line of the automatic quasi-synchronization device is connected with the wiring terminal 1D of the cabinet through a disk cabinet: 32 are connected to 5 nodes of synchronous latching relay TJJ, 7 node lead-out wires of synchronous latching relay TJJ are connected to switching-on outlet relay HJ, and change-over switch KK is connected in parallel to two ends of synchronous latching relay TJJ.
Preferably, the other branch of the dc control loop is sequentially connected in series with a remote/local switch QK and a dc selective point relay DTK11, two ends of the remote/local switch QK are connected in parallel with a local manual selective point switch TK, and two ends of the dc selective point relay DTK11 are connected in parallel with a dc selective point relay DTK21.
Preferably, the automatic quasi-synchronization device is a MAS-3 microcomputer automatic quasi-synchronization device.
Compared with the prior art:
1. according to the invention, a change-over switch KK is additionally arranged on an automatic quasi-synchronous screen of a generator, the change-over switch KK comprises synchronous detection switching-on and non-voltage detection switching-on, normally closed nodes 1 and 2 and normally closed nodes 3 and 4 of the synchronous detection switching-on position are connected in series on the system voltage side of a synchronous locking relay TJJ, and normally open nodes 5 and 6 of the non-voltage detection switching-on position are connected in series with an outlet node of the synchronous locking relay TJJ; when operating personnel carry out breaker synchronization grid-connected operation, locate the change over switch KK and examine synchronization combined floodgate position, namely 1, 2 node and 3, 4 node on the change over switch KK are closed, 5, 6 node on the change over switch KK break off, synchronization latching relay TJJ normal operating realizes the shutting inspection function, and operating personnel is when carrying out breaker and closing the gate operation, locates the change over switch KK and examine no pressfitting gate position, 1, 2 node and 3, 4 node disconnection on the change over switch KK, 5, 6 node on the change over switch KK are closed, and the change over switch KK is blocked system side induced voltage, and synchronization latching relay can not be because of the misoperation of induced voltage, leads to unable the closing the gate operation of closing.
2. According to the invention, the secondary loop terminal of the voltage transformer in the synchronous screen of the generator is replaced by the test terminal, and the special test terminal is additionally arranged on the synchronous locking relay, so that an maintainer can block the induced voltage of the synchronous locking relay during closing the ring by a method of breaking the connecting piece of the test terminal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a DC control loop for a three-half main-line synchronous device switching-on loop according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an ac voltage loop of a synchronous device switching-on loop for three-half main wiring according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, the invention discloses a synchronous device closing loop for three-half main wiring, a transfer switch KK2 is additionally arranged on an automatic quasi-synchronous screen of a generator, the transfer switch KK2 is arranged in the automatic quasi-synchronous closing loop of the generator, the transfer switch KK2 comprises synchronous closing detection and non-voltage closing detection, normally closed 1 and 2 nodes and normally closed 3 and 4 nodes of the synchronous closing detection position are connected in series on the system voltage side of a synchronous locking relay TJJ3, and normally open 5 and 6 nodes of the non-voltage closing detection position are connected in series with an outlet node of the synchronous locking relay TJJ 2; the method comprises the following steps: the switching switch KK3 is positioned at a synchronous closing position, the 1 node, the 2 node, the 3 node and the 4 node on the switching switch KK3 are closed, the 5 node and the 6 node on the switching switch KK3 are opened, an operator performs synchronous grid-connected operation of the circuit breaker, and the synchronous locking relay TJJ2 normally operates to realize locking test; the change over switch KK3 is in examining no pressfitting floodgate position, 1, 2 node and 3, 4 node disconnection on the change over switch KK3, 5, 6 node on the change over switch KK3 are closed, and operating personnel carries out circuit breaker synchronization grid-connected operation, change over switch KK3 will synchronous latching relay TJJ2 voltage side induced voltage block, and synchronous latching relay TJJ2 can not be by the misoperation-lockout of induced voltage.
The secondary loop terminal of the voltage transformer in the automatic quasi-synchronous screen of the generator is replaced by a test terminal, a special test terminal is additionally arranged on the synchronous locking relay TJJ, and an operator can break the test terminal connecting piece to block the induced voltage of the synchronous locking relay TJJ in the closing and closing process.
As shown in fig. 1, the synchronous latching relay TJJ2 and the automatic quasi-synchronous device 1 are connected in series on one branch of the dc control circuit, specifically: the wiring terminal J2:8 outgoing line of the automatic quasi-synchronization device 1 is connected to the 9 node of the direct current selective point relay DTK119, the wiring terminal J2:9 outgoing line of the automatic quasi-synchronization device 1 is connected to the 9 node of the direct current selective point relay DTK217, the wiring terminal J2:8 outgoing line, the wiring terminal J2:9 outgoing line and the wiring terminal J1:7 outgoing line of the automatic quasi-synchronization device 1 are arranged in parallel, a press brake-free button JWYHA5 is connected in series between the wiring terminal J2:6 and the wiring terminal J2:7 of the automatic quasi-synchronization device 1, and the wiring terminal J3:6 outgoing line of the automatic quasi-synchronization device 1 is connected with the wiring terminal 1D through a cabinet: 32 are connected to 5 nodes of synchronous locking relay TJJ2, 7 node lead-out wires of synchronous locking relay TJJ2 are connected to switch-on outlet relay 4, and change-over switch KK3 is connected in parallel to two ends of synchronous locking relay TJJ 2.
As a further preferable aspect of the present invention, the remote/local switch QK11 and the dc selective point relay DTK119 are sequentially connected in series to the other branch of the dc control circuit, the local manual selective point switch TK10 is connected in parallel to both ends of the remote/local switch QK11, and the dc selective point relay DTK217 is connected in parallel to both ends of the dc selective point relay DTK 119.
As shown in fig. 2, the synchronous latching relay TJJ2 and the automatic quasi-synchronous device 1 are connected in parallel in an ac voltage loop, specifically: one path of outgoing lines of the wiring terminals J3:3 on the automatic quasi-synchronization device 1 passes through the wiring terminal 1D of the cabinet: 29 is connected to 2 nodes of synchronous locking relay TJJ2, and the other way is connected to 11 nodes of alternating current selective point relay DTK128, 3 nodes of alternating current selective point relay DTK128 are connected to a main transformer high-voltage side PT terminal box, wiring terminal J3:1 on automatic quasi-synchronous device 1 leads out one way through cabinet wiring terminal 1D:26 connect in change over switch KK 2's 2 node, another way is connected in the 9 nodes of exchanging selective relay DTK128, exchanging selective relay DTK 128's 1 node is connected on 330kVI female PT terminal box, wiring terminal J3:4's on the automatic quasi-synchronization device 1 lead-out wire all the way passes through cabinet wiring terminal 1D:30 is connected to 4 nodes of the synchronous locking relay TJJ2, the other path is connected to 12 nodes of the alternating current selective relay DTK128, 4 nodes of the alternating current selective relay DTK128 are connected to a main transformer high-voltage side PT terminal box, and one path of outgoing lines of the wiring terminals J3:2 on the automatic quasi-synchronous device 1 passes through the cabinet wiring terminal 1D:28 is connected to the 4 node of the change-over switch KK2, the other path is connected to the 10 node of the alternating current selective point relay DTK128, and the 2 node of the alternating current selective point relay DTK128 is connected to the 330kVI female PT terminal box.
As a further preferred aspect of the present invention, the ac setpoint relay DTK226 is connected in parallel to two ends of the ac setpoint relay DTK128, and the third outgoing line of the connection terminal J3:1 on the automatic quasi-synchronization device 1 passes through the cabinet connection terminal 1D:25 is connected to the 9 nodes of the alternating current selective relay DTK226, the 1 node of the alternating current selective relay DTK226 is connected to a 330kV residual 1 line PT terminal box, and a third outgoing line of a wiring terminal J3:2 on the automatic quasi-synchronization device 1 is connected to a wiring terminal 1D through a cabinet: 27 are connected to 10 nodes of an alternating current selective relay DTK226, and 2 nodes of the alternating current selective relay DTK226 are connected to a 330kV residual 1-wire PT terminal box.
The automatic quasi-synchronization device 1 is a MAS-3 microcomputer automatic quasi-synchronization device.
The specific working process of the invention comprises the following steps: the primary loop of three-half main wiring has two synchronization points, namely 3311 synchronization point and 3310 synchronization point.
The positive power of the direct current power supply is supplied to a 707 loop/709 loop through the operation of a remote/local change-over switch QK11 and a local manual point selection switch TK10, and after the direct current point selection relays DTK11 (21) and DTK12 (22) are excited, the point selection operation is completed by 3311 synchronous points/3310 synchronous points.
After the point selection operation, taking 3311 synchronization point as an example:
after the direct current point selecting relay DTK119 is excited, a normally-open contact point of the direct current point selecting relay DTK119 sends 3311 synchronous point selecting signals to the automatic quasi-synchronous device 1, and after the automatic quasi-synchronous device 1 receives the signals, the synchronous closing command of the 3311 synchronous point starts to be executed.
After the alternating current point selecting relay DTK128 is excited, the normally open contact of the alternating current point selecting relay DTK128 sends alternating current voltages at two sides of the 3311 synchronization point to the automatic quasi-synchronization device 1 so as to judge synchronization conditions of the automatic quasi-synchronization device 1; when the alternating current voltages at two sides of the 3311 synchronous point meet the synchronous parallel connection condition, the automatic quasi-synchronous device 1 sends a closing instruction to excite the closing outlet relay HJ4, the normally open contact of the closing outlet relay HJ4 is connected to a closing loop of the circuit breaker, and the circuit breaker completes synchronous closing after closing.
When the three-half main wiring is overhauled by the unit, ring closing operation is completed, at the moment, the synchronous point on the primary loop of the three-half main wiring is to be parallel, the side voltage is zero, and at the moment, the non-pressing brake button JWYHA5 is pressed down, so that ring closing and brake closing operation can be completed.
After a synchronous loop is connected with a synchronous locking relay TJJ2, the synchronous locking relay TJJ2 senses the voltage of the system side to be combined when a unit is overhauled, so that the automatic quasi-synchronous device 1 cannot perform ring combining operation due to the fact that the voltage of the to-be-combined side is not zero when a ring is combined; and the synchronous locking relay TJJ2 can be normally put into operation during the synchronous detection period, so that the reliability of the system is improved.
Through the transformation to synchronous locking device, the operating personnel can be convenient operate change over switch KK3 to adapt to the various operating modes of the automatic quasi-synchronization device of generator, can no longer take place in closing the ring and closing the floodgate in-process, cause synchronous locking relay malfunction and the automatic quasi-synchronization device of locking because of the induced voltage influence, lead to unable operation.
And secondly, the secondary loop terminal of the voltage transformer in the automatic quasi-synchronous screen of the generator is replaced by the test terminal, a special test terminal is additionally arranged on the synchronous locking relay TJJ, and an operator can break the test terminal connecting piece to block the induced voltage of the synchronous locking relay TJJ in the process of closing the ring and closing the gate.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The synchronous device switching-on loop for three-half main wiring is characterized in that a transfer switch KK is additionally arranged on an automatic quasi-synchronous screen of a generator, the transfer switch KK is arranged in the automatic quasi-synchronous switching-on loop of the generator, the transfer switch KK comprises synchronous switching-on detection and non-voltage switching-on detection, normally closed 1 node, normally closed 2 node, normally closed 3 node and normally closed 4 node of the synchronous switching-on detection position are connected in series on the system voltage side of a synchronous locking relay TJJ, and normally open 5 node and normally open 6 node of the non-voltage switching-on detection position are connected in series with an outlet node of the synchronous locking relay TJJ; the method comprises the following steps:
the switching switch KK is positioned at a synchronous closing position, nodes 1 and 2, and nodes 3 and 4 on the switching switch KK are closed, nodes 5 and 6 on the switching switch KK are opened, an operator performs synchronous grid-connected operation of the circuit breaker, and the synchronous locking relay TJJ operates normally to realize locking detection;
the change-over switch KK is in examining no pressfitting floodgate position, 1, 2 node and 3, 4 node disconnection on the change-over switch KK, 5, 6 node on the change-over switch KK are closed, and operating personnel carries out the synchronous grid-connected operation of circuit breaker, change-over switch KK will synchronous latching relay TJJ voltage side induced voltage block, and synchronous latching relay TJJ can not be because of the misoperation-preventive latch of induced voltage.
2. The synchronous device closing circuit for three-half main wiring according to claim 1, wherein a special test terminal is additionally arranged on the synchronous closing relay TJJ, and a secondary circuit terminal of a voltage transformer in an automatic quasi-synchronous screen of the generator is replaced by the test terminal, so that an operator can break the induced voltage of the synchronous closing relay TJJ in the process of closing the ring and closing the gate by breaking a connecting piece of the test terminal.
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| CN201910899019.7A CN110707753B (en) | 2019-09-23 | 2019-09-23 | Synchronous device closing loop for three-half main wiring |
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| CN201910899019.7A CN110707753B (en) | 2019-09-23 | 2019-09-23 | Synchronous device closing loop for three-half main wiring |
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| CN110707753B true CN110707753B (en) | 2023-06-23 |
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Families Citing this family (2)
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| CN111654063B (en) * | 2020-05-28 | 2022-07-12 | 深圳供电局有限公司 | Automatic self-synchronizing system of small hydropower station hydraulic generator |
| CN111934353B (en) * | 2020-07-03 | 2022-07-05 | 华电电力科学研究院有限公司 | Method for obtaining false synchronization grid-connected signals of unit and optimizing synchronization grid-connected signals |
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