High voltage AC power plant motors,usually referring to rated voltages of 6kV, 10kV and above, play a key role in all kinds of power plants, mainly used to drive high-power equipment. Their high efficiency and reliability are suitable for the harsh working conditions of power plants.The reasonable selection and maintenance directly affect the economy and safety of power plant operation.

High voltage ac power plant motor

Brief Introduction

This series motor, its efficiency indicators can meet level 3 energy efficiency, i.e. IE3, and also can meet level 4 energy efficiency, i.e. IE4, which are specified in Chinese standard GB 755 and in international standard IEC 60034.

Specific requirements for high-voltage AC motors in power plants:

1. Electrical performance requirements

1.1 Startup Features:

1.1.1 The starting current should be limited to 5-7 times the rated current to avoid grid impact (using soft start, variable frequency or hydraulic coupling).

1.1.2 High starting torque (e.g. induced draft fan requires 150%~200% rated torque).

1.2 Efficiency and Energy Efficiency:

1.2.1 Compliant with IE3 (high efficiency) or IE4 (ultra high efficiency) standards, the full load efficiency is usually required to be ≥ 95%.

1.2.2 Low no-load loss, optimized iron core material and winding design.

1.3 Power factor:

Asynchronous motors require ≥ 0.85 (which can be improved through capacitor compensation or synchronous motors).

2. Mechanical structure requirements

2.1 Bearing System:

2.1.1 Large motors use sliding bearings (such as feed water pump motors) or insulated bearings (to prevent shaft current corrosion).

2.1.2 The lubrication system needs to adapt to continuous operation (such as forced lubrication or automatic grease supply).

2.2 Dynamic balance of rotor:

Vibration velocity value ≤ 2.8mm/s(GB/T 10068 standard), to avoid impact on load machinery.

2.3 Explosion proof and anti-corrosion:

The dust area of coal-fired power plants requires explosion-proof design (Ex d IIC T4), and the desulfurization area requires acid and alkali resistant coating.

The core characteristics of high voltage ac power plant motor

• High voltage level

-Common voltages: 6kV, 10kV (domestic), 3.3kV, 6.6kV (international)

-High insulation requirements: using multi-layer mica tape and vacuum pressure impregnation (VPI) process, the insulation level is usually F level (155 ℃) or H level (180 ℃), with high temperature resistance and corona resistance.

• High power output

-Wide power range (200kW~50MW), directly drives large inertia loads (such as fans and pumps) without the need for deceleration devices.

• High reliability design

-Protection level: IP54 (dust-proof and splash proof) or IP55 (waterproof), suitable for humid/dusty environments.

• Cooling method:

- Air cooling (IC611/IC616): Forced air cooling, simple structure.

-Water cooling (IC81W): Closed loop water cooling, used for high heat load motors.

The design of high-voltage motors in power plants needs to balance performance, reliability, and cost, and their technical parameters directly affect the overall energy efficiency and safe operation of the power plant.Therefore, in order to accurately select the optimal high-voltage motor, our technical team needs to have a clear understanding of the equipment's load characteristics, overload requirements, environmental temperature, altitude, and other usage conditions.

Parameters

Technical Specifications

Type:YKK/YXKK/YLKK

· Three-phase, 50/60 Hz

· Voltage: 380~11000 V

· Rated output: up to 12500 kW

· Number of poles: 2,4,6,8,10,12

· Frame size: 350~1000mm

· Cast aluminium squirrel cage for rotor

· Degree of protection:IP54/IP55(Totally enclosed)

· Continuous Duty: S1

· Cooling:IC611/CACA

· Continuous Duty: S1

· Insulation: F with class (120ºC) temperature rise

· Continuous Duty: S1

· With thermal protection PT100(3-wire)

· Roller bearings for maximum load capacity

· Other optional features under requests from customers

Order notice

1.  Sliding bearing

The ambient air temperature of electric motors using sliding bearings should not be lower than 0 deg. C

2. Air-water cooler

The ambient air temperature of electric motors using air water coolers should not be lower than 0 deg. C.For motors with air-water coolers, the cooling water temperature at the inlet of the cooler should not exceed +25 deg.C (according to the natural environment in China, if the condition of Not Exceeding 25 deg.C cannot be met, the maximum cooling water temperature should not exceed +33 deg.C), nor should it be lower than+5 ℃.

Note: if there are special requirements for environmental temperature and altitude, please indicate them before placing order.

3. Starting requirements

When starting the motor with a load, it is necessary to ensure that the terminal voltage during the motor starting process is not less than 85% of the rated voltage.

The motor is allowed to start continuously twice in actual cold state, or once in hot state. The motor should naturally stop between the two starts, and additional restarts should be carried out after the motor has completely cooled til same as room temperature.

Note: if the load is a reciprocating compressor, ventilation fan with large inertia, or crusher, please indicate it before placing

order.

4. Load connection

Note: The electric motor and the driven load should be driven co-axialy through a coupling. lf the transmission method is belt,chain, gear, etc., please specify it before placing order.