CN107681634A - Prevent generator outer net power off after generator asynchronous short circuit safety system - Google Patents
Prevent generator outer net power off after generator asynchronous short circuit safety system Download PDFInfo
- Publication number
- CN107681634A CN107681634A CN201710970426.3A CN201710970426A CN107681634A CN 107681634 A CN107681634 A CN 107681634A CN 201710970426 A CN201710970426 A CN 201710970426A CN 107681634 A CN107681634 A CN 107681634A
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- China
- Prior art keywords
- generator
- outer net
- signal
- logic controller
- power
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Links
- 230000005611 electricity Effects 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses the safety system of generator asynchronous short circuit after preventing generator outer net from powering off, including：Pass through generator connecting in parallel with system cabinet and the grid-connected generator of generator outer net; also include the logic controller being connected simultaneously with generator outer net and generator signal; the logic controller can gather the supply frequency signal of generator and the voltage signal of generator outer net in real time; when it is zero-signal that logic controller collects generator power supply low-frequency signals and generator outer net voltage simultaneously; logic controller can send trip signal to generator comprehensive protection device, and generator comprehensive protection device can control the tripping operation power-off of generator connecting in parallel with system cabinet after receiving trip signal.It is an advantage of the invention that：After generator outer net powers off, logic controller can control generator connecting in parallel with system cabinet also trip power-off by generator comprehensive protection device, so as to effectively prevent that generator asynchronous is short-circuit after generator outer net from powering off.
Description
Technical field
The present invention relates to technical field of generators, and in particular to prevents generator asynchronous short circuit after the power-off of generator outer net
Safety system.
Background technology
At present, the generator in steel-making enterprise is grid-connected by generator connecting in parallel with system cabinet and generator outer net, and generator is adopted
Powered with the grid-connected pattern without online of generator outer net together with generator outer net for power load.When generator is normally sent out
When electric, frequency, phase and the voltage of generator electricity are complete with frequency, phase and the voltage of generator outer net electricity
Unanimously, i.e.,：Generator electricity and the generator outer net electricity same period, now the supply frequency of generator is normal work frequency
Rate, and the power supply low frequency less than normal working frequency is irregular working frequency, normally will be less than 50HZ generator power supply
Frequency is defined as generator power supply low frequency.When external power grid is faulty after power-off suddenly, generator, which now continues to generate electricity, to be carried out
Power supply, because external power grid has automatic switching-in function, at this moment external power grid electricity frequency, phase and voltage can with still in the hair of operation
Frequency, phase and the voltage of motor electricity can be inconsistent, and equipment breakdown is caused so as to cause generator that non-synchronous short circuit occurs.
The content of the invention
It is an object of the invention to provide it is a kind of can prevent generator outer net power off after generator asynchronous short circuit safety protect
Protecting system.
To achieve the above object, present invention employs following technical scheme：Described prevents generator outer net from being sent out after powering off
The non-synchronous short-circuit safety system of motor, including：By generator connecting in parallel with system cabinet and the grid-connected generator of generator outer net, go back
Including the logic controller being connected with generator outer net and generator signal simultaneously, the logic controller can gather generating in real time
The supply frequency signal of machine and the voltage signal of generator outer net, when logic controller collects generator power supply low frequency simultaneously
When signal and generator outer net voltage are zero-signal, logic controller can send trip signal, hair to generator comprehensive protection device
Comprehensive protector of motor can control the tripping operation power-off of generator connecting in parallel with system cabinet after receiving trip signal.
Further, it is foregoing prevent generator outer net power off after generator asynchronous short circuit safety system, its
In：Logic controller is connected with generator outer net and generator signal simultaneously by signal wire.
Further, it is foregoing prevent generator outer net power off after generator asynchronous short circuit safety system, its
In：Logic controller is connected by signal wire with generator comprehensive protection device signal.
The implementation of Pass through above-mentioned technical proposal, the beneficial effects of the invention are as follows：After generator outer net powers off, logic control
Device can control generator connecting in parallel with system cabinet also trip power-off by generator comprehensive protection device, so as to effectively prevent the power-off of generator outer net
Afterwards caused by automatic closing generator asynchronous short circuit and cause the generation of equipment breakdown, improve the safe for operation of generator
Property.
Brief description of the drawings
Fig. 1 be it is of the present invention prevent generator outer net power off after generator asynchronous short circuit safety system
Principle schematic diagram.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, it is described prevent generator outer net power off after generator asynchronous short circuit safety system, bag
Include：By generator connecting in parallel with system cabinet 1 and the grid-connected generator 3 of generator outer net 2, in addition to simultaneously with generator outer net 2 and generate electricity
The logic controller 4 of the signal of machine 3 connection, the logic controller 4 pass through the first signal wire 5 and the wire signal of generator outer net 2
Connection, the logic controller 4 are connected by secondary signal line 6 with the wire signal of generator 3, and the logic controller 4 passes through
The voltage of supply frequency signal and generator outer net 2 that first signal wire 5 can gather generator 3 in real time with secondary signal line 6 is believed
Number, when logic controller 4 collected simultaneously with secondary signal line 6 by the first signal wire 5 generator power supply low-frequency signals and
When generator outer net voltage is zero-signal, logic controller 4 can be sent by the 3rd signal wire 7 to generator comprehensive protection device 8
Trip signal, generator comprehensive protection device 8 can control the tripping operation power-off of generator connecting in parallel with system cabinet 1 after receiving trip signal；
The operation principle of the present invention is as follows：
When it is power load normal power supply that generator 3 is together with generator outer net 2, logic controller 4 can pass through the first signal
Line 5 gathers the supply frequency signal of generator 3 and the voltage signal of generator outer net 2 in real time with secondary signal line 6；Work as generator
After outer net 2 powers off, logic controller 4 collects generator power supply low frequency simultaneously by the first signal wire 5 with secondary signal line 6
When signal and generator outer net voltage are zero-signal, logic controller 4 can be by the 3rd signal wire 7 to generator comprehensive protection device
8 send trip signal, and generator comprehensive protection device 8 can control the tripping operation power-off of generator connecting in parallel with system cabinet 1 after receiving trip signal, from
And outer net after generator and power-off is protected, avoid occurring the serious short-circuit device accident of non-Switching Synchronization.
It is an advantage of the invention that：After generator outer net powers off, logic controller can pass through generator comprehensive protection device control
Generator connecting in parallel with system cabinet processed also trips power-off, so as to effectively prevent after generator outer net from powering off circuit can automatic closing and generator it is non-
Same period short circuit, causes the generation of equipment breakdown, improves the safety in operation of generator.
Claims (3)
1. the safety system of generator asynchronous short circuit after the power-off of generator outer net is prevented, including：Pass through generator connecting in parallel with system
Cabinet and the grid-connected generator of generator outer net, it is characterised in that：Also include being connected with generator outer net and generator signal simultaneously
Logic controller, the logic controller can gather in real time generator supply frequency signal and generator outer net voltage letter
Number, when it is zero-signal that logic controller collects generator power supply low-frequency signals and generator outer net voltage simultaneously, logic
Controller can send trip signal to generator comprehensive protection device, and generator comprehensive protection device can control after receiving trip signal
The tripping operation power-off of generator connecting in parallel with system cabinet.
2. it is according to claim 1 prevent generator outer net power off after generator asynchronous short circuit safety system,
It is characterized in that：Logic controller is connected with generator outer net and generator signal simultaneously by signal wire.
3. it is according to claim 1 prevent generator outer net power off after generator asynchronous short circuit safety system,
It is characterized in that：Logic controller is connected by signal wire with generator comprehensive protection device signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710970426.3A CN107681634A (en) | 2017-10-18 | 2017-10-18 | Prevent generator outer net power off after generator asynchronous short circuit safety system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710970426.3A CN107681634A (en) | 2017-10-18 | 2017-10-18 | Prevent generator outer net power off after generator asynchronous short circuit safety system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107681634A true CN107681634A (en) | 2018-02-09 |
Family
ID=61140720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710970426.3A Pending CN107681634A (en) | 2017-10-18 | 2017-10-18 | Prevent generator outer net power off after generator asynchronous short circuit safety system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107681634A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2159981C2 (en) * | 1998-06-10 | 2000-11-27 | Александров Виктор Федорович | Method for automatic protection against asynchronous running |
| CN102265368A (en) * | 2008-12-25 | 2011-11-30 | 三菱电机株式会社 | Phase-control switchgear and method for controlling switchgear |
| CN103119815A (en) * | 2010-09-09 | 2013-05-22 | Abb技术有限公司 | Method and system for disconnecting a generator from a power system |
| CN204103509U (en) * | 2014-09-11 | 2015-01-14 | 郑程遥 | A kind of generator connecting in parallel with system automatic sub-synchronous device |
| CN207603196U (en) * | 2017-10-18 | 2018-07-10 | 江苏永钢集团有限公司 | Prevent generator outer net power off after generator asynchronous short circuit safety system |
-
2017
- 2017-10-18 CN CN201710970426.3A patent/CN107681634A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2159981C2 (en) * | 1998-06-10 | 2000-11-27 | Александров Виктор Федорович | Method for automatic protection against asynchronous running |
| CN102265368A (en) * | 2008-12-25 | 2011-11-30 | 三菱电机株式会社 | Phase-control switchgear and method for controlling switchgear |
| CN103119815A (en) * | 2010-09-09 | 2013-05-22 | Abb技术有限公司 | Method and system for disconnecting a generator from a power system |
| CN204103509U (en) * | 2014-09-11 | 2015-01-14 | 郑程遥 | A kind of generator connecting in parallel with system automatic sub-synchronous device |
| CN207603196U (en) * | 2017-10-18 | 2018-07-10 | 江苏永钢集团有限公司 | Prevent generator outer net power off after generator asynchronous short circuit safety system |
Non-Patent Citations (1)
| Title |
|---|
| 初恒旭: ""一种同步电动机断电失步保护的简易装置"", 《电工技术》, pages 23 - 24 * |
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