Description

型号MMI301 General Electric
型号MMI301 General Electric
Module Clips Drive controller servo motor
Contact: Mr. Lai
Wechat:17750010683
Whats app：+86 17750010683
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What are the hazards of generator loss of excitation?

The impact of generator loss of excitation on the system mainly includes:

1. Low-excitation and loss-of-excitation generators absorb reactive power from the system and cause the voltage of the power system to decrease. If the reactive power reserve in the power system is insufficient, the voltage of some adjacent points in the power system will be lower than the allowable value, which will destroy the stable operation between the load and each power source, and even make the power system voltage collapse and collapse.

2. When a generator loses excitation, due to the voltage drop, other generators in the power system will increase their reactive output under the action of the automatic adjustment excitation device, thus causing some generators, transformers or lines to overcurrent, and their backup protection may misoperate due to overcurrent, thus expanding the scope of the accident.

3. After the loss of excitation of a generator, due to the swing of the active power of the generator and the drop of the system voltage, it may lead to the loss of step between the adjacent normal operation generators and the system, or between the various parts of the power system, causing the system to oscillate.

4. The larger the rated capacity of the generator, the greater the reactive power deficit caused by low excitation and loss of excitation, and the smaller the capacity of the power system, the smaller the ability to compensate for this reactive power deficit. Therefore, the greater the ratio of the unit capacity of the generator to the total capacity of the power system, the more serious the adverse impact on the power system.型号MMI301 General Electric

The impact of generator loss of excitation on the generator itself mainly includes:

1. Due to the slip after the loss of excitation of the engine, the differential frequency current appears in the generator rotor circuit. The differential frequency current will cause loss in the rotor circuit. If it exceeds the allowable value, the rotor will overheat. In particular, the thermal capacity margin of large units with direct cooling and high power rate is relatively low, and the rotor is more prone to overheating. The differential frequency current on the surface of the rotor may also cause serious local overheating or even burns on the contact surface of the slot wedge and retaining ring of the rotor body.

2. After the loss-of-excitation generator enters the asynchronous operation, the equivalent reactance of the generator decreases, and the reactive power is absorbed from the power system. The greater the active power before the loss of excitation, the greater the slip, the smaller the equivalent reactance, and the greater the reactive power absorbed. After loss of excitation under heavy load, the generator stator will overheat due to overcurrent.

3. For large turbogenerators with direct cooling and high power rate, the maximum value of the average asynchronous torque is small, the inertia constant is also relatively low, and the rotor is also significantly asymmetric in the longitudinal and transverse axes. Due to these reasons, after loss of excitation under heavy load, the torque and active power of the generator will oscillate violently and periodically. For hydro-generators, due to the small maximum value of the average asynchronous torque and the asymmetry of the rotor in the longitudinal and transverse axes, a similar situation will occur when the generator is operated under heavy load. In this case, there will be a large or even exceeding rated motor torque periodically acting on the generator shaft system and transmitted to the base through the stator. At this time, the slip also changes periodically, its maximum value may reach 4%~5%, and the generator will periodically and seriously overspeed. These situations directly threaten the safety of the unit.

4. During loss-of-excitation operation, the magnetic leakage at the end of the stator will increase, which will overheat the components at the end and the iron core at the side.

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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

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

型号MMI301 General Electric

Description

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