Description
DSQC208A DCS system
DSQC208A DCS system
Module Clips Drive controller servo motor
Contact: Mr. Lai
Wechat:17750010683
Whats app：+86 17750010683
Skype：+86 17750010683
QQ: 3221366881
3221366881@qq.com
Phenomenon of generator leading phase operation_ Hazards of generator leading phase operation
Reduce the generator excitation current, reduce the generator potential, and the power factor angle will become advanced. The generator load current will generate the magnetic armature reaction. The generator will transmit active power to the system, but absorb reactive power. This operation state is called leading phase operation.
Phenomenon of generator leading phase operation
1. The excitation current is greatly reduced;
2. Generator stator voltage decreases;
3. The reactive load of the generator becomes negative.
Hazards of generator leading phase operation
1. Increasing the active load of the generator will make the generator develop in an unstable direction, which is easy to cause unstable operation of the generator and even system oscillation accidents.DSQC208A DCS system
2. Continue to reduce the excitation current of the generator and increase the depth of the generator leading phase, which may cause the generator loss of excitation protection action or the generator unstable operation.
3. When the generator is in phase leading operation, the stator current increases and the stator heating increases. The change ratio of the leakage flux at the end of the stator increases, making the end heating the most serious, and the temperature of the generator stator coil will continue to rise.
4. When the generator is in phase leading operation, the generator outlet voltage is reduced, resulting in the reduction of 6KV bus voltage. The high-voltage motor with low-voltage protection will trip. The electrical equipment in operation will heat up due to the reduction of bus voltage and the increase of current, and the insulation of the equipment will be damaged if it is operated for a long time.
When the generator is in leading phase operation. The magnetic leakage at the end of the stator increases when it is operated in a later phase. In particular, the line load of large generators is high, and the end magnetic leakage is relatively large during normal operation. The end core pressure refers to the temperature rise of the connecting piece. During the leading phase operation, the temperature rise is aggravated due to the increase of magnetic leakage. Therefore, when the generator terminal voltage is reduced during leading phase operation, the auxiliary power voltage is also reduced accordingly. If it exceeds 10%, the auxiliary power operation will be affected.
Therefore, the leading phase operation depth of synchronous generator shall be determined by test, that is, how much reactive power can be absorbed to maintain the static stability and transient stability of the system under a certain active power supply state, and the temperature rise of each component shall not exceed the limit, and can meet the voltage requirements.
When the inductive reactive power supplied by the system is more than required, the system voltage will rise, and the generator is required to generate less reactive power or even absorb reactive power. At this time, the generator can change from delayed phase operation to leading phase operation.
Precautions for leading phase operation of generator
1. Check that the generator excitation regulator should operate in automatic mode, and the low excitation limit function of the generator excitation regulator and the generator excitation loss protection should be put into operation normally. Check that the speed control system is flexible and free of jamming.
2. The leading phase depth of the generator shall be adjusted according to the command of the shift supervisor. If the generator automatically leads to phase due to high voltage on the network, the monitoring of all parameters of the generator shall be strengthened, and the report shall be reported to the superior in time.
3. When increasing or decreasing the excitation of the generator, the speed should be slow, and it is not allowed to adjust rapidly and greatly. The limit value of the leading phase operation should be controlled within the specified range, and it should always be less than the limit action value of the low excitation.
4. When lowering the excitation of the generator, if the low excitation limiter acts, immediately stop lowering the excitation of the generator, and properly increase the excitation of the generator to ensure that all parameters of the generator are within the normal range.
5. Pay attention to monitor the static stability of the generator. The indication of each meter of the generator is normal and there is no oscillation. Check that the sound of the generator is normal to prevent the generator from out of step or oscillation.
6. The temperature rise at the end of the stator core of the generator shall be closely monitored to prevent overheating of the generator. The temperature at the end of the core shall not exceed 120 ℃ and the temperature of the copper shield shall not exceed 120 ℃.
7. In case of obvious swing of active and reactive power of other operating units, the excitation current of the leading phase generator shall be increased immediately, and the shift supervisor shall be reported at the same time to recover the delayed phase operation of the generator.
8. If the 6kV main auxiliary equipment fails or needs to be switched, apply to the middle note to stop the generator in leading phase operation, restore the late phase operation state of the generator, and prevent the 6kV and 400V auxiliary voltage from being too low, protection action or tripping of some 400V equipment due to the large reactive load absorbed by the equipment during startup and shutdown.
9. In case of equipment failure, when it is necessary to reduce the load and eliminate defects, immediately apply for middle note to stop leading phase operation, and then apply for leading phase operation after the standby group resumes normal operation.
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Company advantage service:
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
All kinds of module card driver controller servo motor servo motor embedded card wires and cables Power module control module is applicable to steel, hydropower, nuclear power, power generation, glass factory, tire factory, rubber, thermal power, paper making, shipping, navigation, etc
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
