CN111030186A - Prevent to mistake and close return circuit of generator outlet switch - Google Patents
Prevent to mistake and close return circuit of generator outlet switch Download PDFInfo
- Publication number
- CN111030186A CN111030186A CN201911324412.XA CN201911324412A CN111030186A CN 111030186 A CN111030186 A CN 111030186A CN 201911324412 A CN201911324412 A CN 201911324412A CN 111030186 A CN111030186 A CN 111030186A
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- generator
- outlet switch
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- loop
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 230000005284 excitation Effects 0.000 claims description 6
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a loop for preventing a generator outlet switch from being switched on by mistake, which is an improvement on a traditional generator outlet switch switching-on loop and comprises the following steps: (1) a switching-on loop of a generator outlet switch is connected at the joint of a relay 1 and a relay 2 of a unit test switching-on J7, a pressing plate LB1 is added, LB1 is in a quitting state at ordinary times, when the unit switching-on test is to be carried out, LB1 is put into the unit switching-on test by an operator, and LB1 quits after the test is finished; (2) and opening a relay J0 when the rotating speed of the generator is increased by 95% at the LCU, and connecting 1 and 2 nodes of J0 in series into 1 and 2 nodes of XJ5 to form a synchronous closing loop of the generator. The loop of the invention has safe and reliable design, is scientific and reasonable, has low modification cost, can effectively avoid the impact problem of the generator caused by the false switching-on of the outlet switch when the generator is in a shutdown hot standby state, protects the generator set and prolongs the service life of the generator set.
Description
Technical Field
The invention belongs to the technical field of hydroelectric power generation control loops, and particularly relates to a loop for preventing a generator outlet switch from being mistakenly closed.
Background
The generator is switched on by mistake in the shutdown hot standby state, the impact on the generator is huge, the performance of a light generator is reduced, the service life of the generator is shortened, and the heavy generator is damaged, thereby causing great economic loss to the country. The traditional design of a closing loop of an outlet switch of a generator is composed of two branches, one branch is controlled by a generator synchronization device, when the generator meets synchronization conditions, an XJ5 relay acts, and the junction of an XJ5 relay 1 and a junction of the XJ5 relay 2 is connected with the closing loop of the outlet switch of the generator; the other is that the generator computer monitors a set test closing instruction controlled by the local LCU, the J7 relay acts, and the joint of the J7 relay 1 and the J7 relay 2 is connected with a closing loop of an outlet switch of the generator; when some hydroelectric station generators are in a shutdown hot standby state, because the junction of XJ5 relays 1 and 2 is opened by mistake, the junction of J7 relays 1 and 2 is opened by mistake, or the J7 is operated by mistake during the switching-on period of the unit test, the switch of the generator is switched on by mistake, and the problem of impact on the generator is occasionally caused, so that the technical solution is necessary.
Disclosure of Invention
The invention aims to provide a loop which is safe and reliable, scientific and reasonable in design, low in modification cost and capable of preventing the generator outlet switch from being mistakenly closed, aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a prevent that mistake from closing return circuit of generator exit switch is to improve on traditional generator exit switch closes the return circuit, includes:
(1) a switching-on loop of a generator outlet switch is connected at the joint of a relay 1 and a relay 2 of a unit test switching-on J7, a pressing plate LB1 is added, LB1 is in a quitting state at ordinary times, when the unit switching-on test is to be carried out, LB1 is put into the unit switching-on test by an operator, and LB1 quits after the test is finished;
(2) and opening a relay J0 when the rotating speed of the generator is increased by 95% at the LCU, and connecting 1 and 2 nodes of J0 in series into 1 and 2 nodes of XJ5 to form a synchronous closing loop of the generator.
The 95% of the rotating speed of the generator is also an excitation signal for starting the generator at the same time, and the time from the excitation signal for starting the generator at the 95% of the rotating speed of the generator at the same time to the synchronization success of the generator is generally about 100 seconds.
The invention has the advantages that:
the control loop redesigned by the invention is safe, reliable, scientific and reasonable, has low modification cost, can effectively avoid the impact problem of the generator caused by the mistaken closing of the outlet switch when the generator is in the shutdown hot standby state, protects the generator set and prolongs the service life of the generator set.
Drawings
FIG. 1 is a schematic diagram of a circuit for designing a closing circuit of an outlet switch of a conventional generator;
FIG. 2 is a schematic diagram of a circuit for loop design according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example (b):
as shown in fig. 2, a circuit for preventing the generator outlet switch from being erroneously turned on is an improvement on a conventional generator outlet switch closing circuit, and includes:
(1) a switching-on loop of a generator outlet switch is connected at the joint of a relay 1 and a relay 2 of a unit test switching-on J7, a pressing plate LB1 is added, LB1 is in a quitting state at ordinary times, when the unit switching-on test is to be carried out, LB1 is put into the unit switching-on test by an operator, and LB1 quits after the test is finished;
(2) and opening a relay J0 when the rotating speed of the generator is increased by 95% at the LCU, and connecting 1 and 2 nodes of J0 in series into 1 and 2 nodes of XJ5 to form a synchronous closing loop of the generator.
The 95% of the rotating speed of the generator is also an excitation signal for starting the generator at the same time, and the time from the excitation signal for starting the generator at the 95% of the rotating speed of the generator at the same time to the synchronization success of the generator is generally about 100 seconds.
A certain hydraulic power plant is used for performing peak frequency modulation on a power grid, 7 700MW hydraulic generators are used, the average standby time of each unit in 2018 is 3894.56h, namely, the hydraulic power plant is shut down for standby about 10.67h each day. The synchronous successful grid connection of the generator from 95% of the rotation speed to the generator is generally about 100 seconds, so that the fault occurrence rate of mistakenly closing the outlet switch of the generator can be reduced by 99.74%.
It should be noted that the above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. The utility model provides a prevent to miss return circuit that closes generator outlet switch improves on traditional generator outlet switch closes the return circuit, its characterized in that includes:
(1) a switching-on loop of a generator outlet switch is connected at the joint of a relay 1 and a relay 2 of a unit test switching-on J7, a pressing plate LB1 is added, LB1 is in a quitting state at ordinary times, when the unit switching-on test is to be carried out, LB1 is put into the unit switching-on test by an operator, and LB1 quits after the test is finished;
(2) and opening a relay J0 when the rotating speed of the generator is increased by 95% at the LCU, and connecting 1 and 2 nodes of J0 in series into 1 and 2 nodes of XJ5 to form a synchronous closing loop of the generator.
2. The circuit for preventing false-closing of a generator outlet switch according to claim 1, wherein: the 95% of the rotating speed of the generator is also an excitation signal for starting the generator at the same time, and the time from the excitation signal for starting the generator at the 95% of the rotating speed of the generator at the same time to the synchronization success of the generator is generally 100 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911324412.XA CN111030186A (en) | 2019-12-20 | 2019-12-20 | Prevent to mistake and close return circuit of generator outlet switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911324412.XA CN111030186A (en) | 2019-12-20 | 2019-12-20 | Prevent to mistake and close return circuit of generator outlet switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111030186A true CN111030186A (en) | 2020-04-17 |
Family
ID=70211173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911324412.XA Pending CN111030186A (en) | 2019-12-20 | 2019-12-20 | Prevent to mistake and close return circuit of generator outlet switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111030186A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431229A (en) * | 2008-12-05 | 2009-05-13 | 浙江省电力公司 | Asynchronous switch-on protection method for generator set |
| CN103647306A (en) * | 2013-12-10 | 2014-03-19 | 龙滩水电开发有限公司 | Automatic quasi-synchronization closing loop for preventing generator nonsynchronous closing |
| CN107086667A (en) * | 2017-06-08 | 2017-08-22 | 国电大渡河流域水电开发有限公司 | A kind of outlet breaker closing circuit structure and its method of work |
-
2019
- 2019-12-20 CN CN201911324412.XA patent/CN111030186A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431229A (en) * | 2008-12-05 | 2009-05-13 | 浙江省电力公司 | Asynchronous switch-on protection method for generator set |
| CN103647306A (en) * | 2013-12-10 | 2014-03-19 | 龙滩水电开发有限公司 | Automatic quasi-synchronization closing loop for preventing generator nonsynchronous closing |
| CN107086667A (en) * | 2017-06-08 | 2017-08-22 | 国电大渡河流域水电开发有限公司 | A kind of outlet breaker closing circuit structure and its method of work |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200417 |
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| RJ01 | Rejection of invention patent application after publication |