Introduction of electrical equipments of MSW power plant
Writer： Hengfeng you electric Time：2023-04-18 views：times
Introduction of electrical equipments of MSW power plant
Main electrical equipments
In order to satisfy the equipment’s requirement to power and the safety and stability running of the electric energy system and the economic benefit, the priority mission of the electrical system is, start and stop the unit, adjust the load, switch between equipment and line, constant survey major equipment, quickly react to failure or unusual situation, etc. The above missions are completed by operation of major electrical equipment. According to the experience of hengfengyou electric, the main electrical equipment of the power plant is as follows:
1.1 Turbogenerator
Generator is one kind of rotate electrical equipment which follows the rule of electromagnetic induction, transferring mechanic energy into electric energy. t directly couples to the turbine and rotates. The direction of generator rotating is clockwise seen from the turbine end.
|
power factor model |
QFW-7-2 6600V |
rated power |
7000 kW |
power factor（COSφ） |
0.8 |
|
rated stator voltage |
6600V |
rated stator current |
765A |
rated rotation speed |
3000 r/min |
|
number of polar |
2 |
number of phase |
3 |
stator connection type |
Y |
1.2 Diesel generator
It is usually in backup status. When the plant is under emergency shutdown, the auto control system will isolate the plant supply busbar and the security section, at the same time sends out signal to command the diesel generator to start, adjust speed, boost up pressure, shut valve and series of action, and supply power to security section, keep basic equipment running in10 to15 second, guaranteeing the safety shutdown of boiler and turbine and other auxiliary equipments.
1.3 Motor
Motor is a kind of rotating electric equipment which follows the rules of electromagnetic induction. It transfers electric energy to mechanical energy, driving fans, pumps, compressors and other machines in the plant. According to the technical requirement, primary fan, secondary fan, induced draft fan, water feed pump and condensing water pump adopt frequency control, their motors adopt converter motors in correspondence.
高压电动机 High voltage motor 低压电动机Low voltage motor
1.4 Main Transformer
Main Transformer is a static appliance. It follows the rules of electromagnetic induction, makes one kind of AC power into another kind with same frequency but different voltage and current.
1.5 Plant transformer
Main parameters of three-phase epoxy resin cast dry-type transformer produced by hengfengyou transformer
|
Model |
SCB10-2000/6.6 |
Rated capacity |
2000KVA |
Frequency |
50Hz |
|
Primary voltage |
6.6KV±2×2.5% |
Secondary voltage |
0.4KV |
Number of phase |
3 |
|
Primary current |
175A |
Secondary curent |
2886.8A |
Cooling type |
AF |
1.6 Transformer protection device
The transformer protection device is set protection, monitoring, control, communication and other functions in the integration of electric power automation high-tech products, are the ideal intelligent switchgear electrical unit.
Main parameters of hengfengyou electric medium voltage switchgear
|
project |
unit
|
parameter
|
|
The rated voltage
|
kV
|
40.5
|
|
Rated insulation level
|
Lightning voltage (full wave)
|
kV
|
185
|
|
Power frequency withstand voltage (1min)
|
kV
|
95
|
|
Rated frequency
|
Hz
|
50
|
|
Rated current
|
A
|
630；1250；1600；2000
|
|
Rated break time
|
Power frequency withstand voltage (1min)
|
kV
|
20、25、31.5
|
|
Rated short circuit closing current (peak)
|
kV
|
50、63、80
|
|
Rated dynamic stability current (peak)
|
kV
|
50、63、80
|
|
4S heat stable current (effective value)
|
kV
|
20、25、31.5
|
|
Enclosure protection class
|
Vacuum breaker cabinet
|
mm
|
IP4X
|
|
Dimension (L * W * H)
|
SF6 gas short circuit cabinet
|
mm
|
1400×2200×2600
|
1.8 6.6 kV medium voltage switchgear
According to the demand of this plant, the 6.6 kV power distribution system has KYN28A-12 type center withdrawing metal shielded closed switch cabinets and XGN2-12 fixed metal shielded closed switch cabinets.
The low voltage power distribution house of the main plant building has MNS type low voltage withdrawing cabinet, to distribute, switch, control, survey and protect the plant power supply, plant power backup, emergency security power. It is the power distribution center of the whole plant use.
1.10 XL power Distribution board
According to the difference of need and function, set up repair box, local power box, local control box at other places of main building and other workshops, to distribute power and control the local equipments.
1.11 Generator excitation cabinet
Excitation system is an important part of the generator. The basic task for generator excitation regulator is: (1) keep the generator voltage stable; (2) ensure the adequate distribution of reactive power between synchronized running units through reasonable differential control; (3) enhance the temporary status stability and static status stability through quick excitation respond.
1.12 Quick switch box for plant power supply
Electrical equipment safe running depends on the continuous reliable power supply. In order to guarantee reliable power supply, this plant has deployed plant backup power besides working power. Therefore, requiring higher reliability of power supply is equipped with two way more power supply, the success of the switch between two power supplies is the key to the continuous uninterrupted power supply.
1.13 Synchronization box
Synchronization system mainly works as protection of system and the safety running of the synchronized units.onization which requires adjusting the generator and system before synchronized,and let it fulfill the three conditions following simultaneously:
·Frequency differential not more than 0.2%~0.5%;
·Voltage differential not more than 5%~10%;
·Initial phase angle differential not more than 10°.
The impact current is smaller at this time, which is able to recruit at once with less interference to the system.
1.14 Inverter box
In order to improve the control accuracy, also the start performance of motor, and saving energy and plant uses power, the main motors of T auxiliary equipment adopt frequency control.
1.15 Soft starter
Soft starter is a collection of soft start, soft stop, light load energy saving and multi-functional protection of motor control equipment. No impact on the implementation in the entire launch process and a smooth start the motor, and can be adjusted according to the characteristics of the motor load to start the process of various parameters, such as current limiting values, start time, etc.
1.16 Circuit breaker
Circuit breaker is to point to to close, loading and open circuit loop current under the condition of normal and can close, within the prescribed time and open circuit under the condition of abnormal loop current switch devices. Circuit breaker according to its use range was divided into high, medium and low voltage circuit breaker.
1.17 Wires and cables
The cables for the whole plant are flame retardant cables.
（1）10KV power cable
（2）1KV power cable
（3）control cable
（4）computer cable
1.17Cable tray
Cable tray is carrying a carrier of the wire, and let wire to the building a lot of position, and will not effect the beauty of the building
In summary, the above is the main equipment summarized by hengfengyou electric according to the distribution equipment supplied to the power plant for many years.
