The hottest Liaoning generator equipment leasing c

2022-09-26
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10 What is the reason for the bearing temperature rise of the unit? What is the set value of the temperature of each bearing of the unit

answer: the reason for the increase of bearing temperature:

a. the failure of thermometer causes false signal

b. the cooling water volume decreases and the water pressure decreases

c. oil level decreases or oil quality deteriorates

d. the vibration and swing of the unit increase

e. cooler blockage and ambient temperature rise

f. the lubricating oil pressure drops or stops, and the oil flow is blocked

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generator structure here is clear

here is the structure of steam turbine generator. Due to the different sizes of generators, the structures are different, but the structures and functions of the main parts are the same. This courseware introduces the basic structure and composition of steam turbine generator. In order to show clearly, the number of stator and rotor slots is small, The shape of stator coil is drawn according to the coil wound by wire (not the coil connected by copper bar or copper tube). The structure of the main components of the generator is drawn with reference to large and medium-sized steam turbine generators

the generator is mainly composed of rotor and stator. The steam turbine generator is a synchronous generator. Due to the high speed of the steam turbine, the rotor of the steam turbine generator has only one pair of magnetic poles, which output three-phase alternating current of Hertz at the rated speed of RPM. The basic structure and composition of steam turbine generator are introduced through a model of steam turbine generator

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8 What is the function of the bypass valve

answer: when the water head is high or the valve diameter is large, in order to reduce the door opening force and avoid the wear of the butterfly valve bearing due to the force on one side, open the bypass valve manually and automatically before the butterfly valve is opened. Open the butterfly valve after the pressure on both sides of the butterfly valve is balanced

9. What is the function of the air valve

answer: the air valve is installed on the connecting pipe behind the butterfly valve. When the water in the pipe section behind the valve and the volute is empty, air is added or discharged when water is filled. When the butterfly valve is closed due to an accident, air is also added by the air valve, so that the pipe section behind the valve and the volute will not be damaged by vacuum

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rotor

due to the high speed of large steam turbine generator, the linear speed on the surface of rotor pole reaches more than m/s, and the centrifugal force is large, the rotor diameter cannot be too large, and the rotors of large generators are slender. There is no protruding magnetic pole on the circumference of the rotor. The rotor iron core is a cylinder with some slots on the circumference. There is a section of surface with large slot distance on both sides of the circumference, which is called big tooth, that is, magnetic pole (shown), which is called hidden pole rotor. The excitation winding is embedded in the slot, and the hidden pole rotor divides the excitation winding into multiple coils, which is convenient for installation and reinforcement

both ends of the excitation winding are connected to the excitation power supply through the collector ring (slip ring), and the north pole and south pole are formed on both sides of the rotor circumference. When rotating, a rotating magnetic field is generated

refers to the section between the stator core and the rotor core of the steam turbine generator. The middle part is the rotor core, the outside is the stator core, and the rotor core adopts the hidden pole structure. In order to show clearly, the stator core and rotor core of this model are set with less slots

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b: too low voltage will worsen the working condition of the auxiliary motor

c: if the generator capacity remains unchanged, when the voltage is too low, the stator current must be increased, and the stator winding temperature will increase, otherwise the generator capacity will be low

operation

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are enlarged sections of stator core and rotor core, and there is an air gap between the two cores. The inner circumference of the stator core is provided with slots for embedding the stator coil, and small slots for fixing slot wedges are arranged on both sides of the slot. The purpose of slot wedges is to press the stator coil. There are slots on the outer circumference of the rotor core for embedding the rotor coil, small slots on both sides of the slot to fix the slot wedge, and slots for ventilation at the bottom of the slot

the rotor core and shaft are made of alloy steel with high strength and high permeability. There are some axial and radial pores in the rotor core for ventilation and cooling. Due to different cooling methods of various motors, the direction of pore arrangement is also different, so it will not be introduced here. See

the rotor excitation winding is composed of multiple coils, which are embedded in the slot of the rotor core. Multiple coils are connected in series to form the rotor winding. A collector ring is installed at the excitation end of the rotor shaft (hereinafter referred to as the excitation end), and the two wire ends of the rotor winding are connected to the two collector rings respectively. See you

after embedding the coil, insert a slot wedge into the slot to press the coil in the slot, and the end of the coil outside the slot is pressed with a retaining ring to prevent the coil from being thrown out by centrifugal force.

in order to reduce the influence of negative sequence magnetic field, a damping device is also installed on the surface of the rotor, which will not be introduced here

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10 What is the reason for the bearing temperature rise of the unit? What is the set value of the temperature of each bearing of the unit

answer: the reason for the increase of bearing temperature:

a. the failure of thermometer causes false signal

b. the cooling water volume decreases and the water pressure decreases

c. oil level decreases or oil quality deteriorates

However, it has the disadvantages of high cost, long cycle and low efficiency

d. the vibration and swing of the unit increase

e. cooler blockage and ambient temperature rise

f. the lubricating oil pressure drops or stops, and the oil flow is blocked

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in order to reduce the temperature of the generator, axial fans are also installed at both ends of the rotor to forcibly circulate the gas in the generator. See, this is the whole rotor, which is the rotating part of the generator

because the magnetic flux in the stator core is constantly changing, in order to prevent eddy current loss, the stator core is made of multilayer silicon steel sheets, which are coated with insulating paint to insulate each other. Silicon steel sheet has good magnetic conductivity. For ventilation cooling, the stator core is divided into multiple sections with gaps between the sections to realize radial ventilation. At both ends of the stator core, press the stator core with pressing rings and threading screws, see

-- the stator core of the steam turbine generator

the three-phase winding of the stator is embedded in the stator core slot, and the winding form is generally double-layer overlapping winding. Each phase winding is composed of multiple coils, which are symmetrically arranged according to a certain law. The coils of large generators have only a few turns, which are bent by copper bars or tubes, and connected at the ends to form coils. This model is simplified. The coil is a multi turn coil made of skin insulated wires

there are coils in the slot motor model, which are divided into groups to form three-phase windings. Among the outgoing lines, one is the output end of phase a, B and C, and the other is the neutral end, which are connected to the porcelain bushing terminal of the outlet box below the motor

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what consequences will occur if the generator operating voltage is too low

1. What are "analog quantity" and "switching quantity"

answer: analog quantity - display the values of unit speed, stator and rotor current, voltage, temperature of each guide bearing, water pressure, oil pressure and other analog quantities, as well as the values of line, bus voltage, frequency, line current, active and reactive power, main transformer temperature and other analog quantities

switching value -- it shows the opening and closing of the circuit breaker, knife switch and de excitation switch of the unit host, the increase and decrease of active power, and the on and off of each solenoid valve

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these coils are embedded in the slots of the stator core of the steam turbine generator, see

after embedding the coil, insert a slot wedge into the slot to compress and fix the coil. It is the sectional view of the stator core with the coil embedded

the actual assembly process of the generator is that the stator core is installed into the base first, and then the coil is embedded

the base (shell) is made of rolled steel plates. In order to ensure the rigidity, multiple rings of ring reinforcement and multiple axial reinforcements are welded on the inner wall of the shell. The decomposition temperature of the foaming agent should be about 10 ℃ higher than the activation temperature of the crosslinking agent. The ring reinforcement of this model is wide, and there are multiple air vents for the convenience of cooling gas flow. There is a generator outlet box under the base, from which the three-phase alternating current is led, see. The installed casing and end cover shall have good air tightness to prevent the leakage of cooling medium

-- generator shell

install the stator core in the generator base, then embed the stator coil, and connect each phase coil to form a three-phase winding. Insert the stator slot wedge into the slot of the stator core and compress the coil in the slot, see. The wire ends of the three-phase windings are connected to the six porcelain bushing terminals of the outlet box, which are connected in a Y-shaped connection outside the outlet box and output as three-phase four wire

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eliminate errors as soon as possible 2 What is a closed loop control system

answer: all the output signals of the control system that can have a direct impact on the control effect of the system are called closed-loop control systems. The governor system and microcomputer excitation regulation system of the unit belong to closed-loop control system

3 implement people item by item What are the causes of generator oscillation

answer: A. static stability damage is mainly caused by the change of operation mode or the long removal time of fault point

b. the impedance of generator and system connection increases suddenly

c. power mutation in the power system, resulting in a serious imbalance between supply and demand

d. the reactive power in the power system is seriously insufficient and the voltage drops suddenly

e. the generator governor fails

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