YZYKK positive pressure explosion-proof motor

Introduction to YZYKK positive pressure explosion-proof motor

The YZYKK series positive pressure shell type high-voltage high-efficiency three-phase asynchronous motor is an explosion-proof series product designed and manufactured by our company using international advanced technology, combined with decades of practical experience in producing high-voltage motors. This product has the advantages of compact structure, light weight, high efficiency, energy saving, low noise, low vibration, high reliability, long service life, and easy installation and maintenance. The efficiency value complies with the national GB30254-2013 standard According to the regulations of the second level energy efficiency level for high-voltage three-phase cage asynchronous motors, the positive pressure explosion-proof technology is the first of its kind in China. The motor adopts an internationally renowned ventilation and leakage compensation system to ensure that when the motor starts, the combustible gas inside the motor cavity is effectively replaced (otherwise the device sends an interlock signal and does not allow the motor to start). The device gives a driving signal, and the motor automatically enters the leakage compensation state. During operation, the compensation system automatically maintains the appropriate pressure inside the cavity to prevent combustible gas from entering the shell. When the pressure is too low or the pressure is lost, if normal leakage compensation cannot be guaranteed, the system will automatically alarm and cut off the power supply or issue an alarm. Through the above measures, the reliability of the motor has been further improved, achieving a perfect combination of automatic control and comprehensive protection.

This series of products is mainly suitable for general mechanical equipment such as fans, water pumps, compressors, crushers, chip cutting machines, transportation machinery, and other similar mechanical equipment in industries such as petroleum, chemical, coal, power plants, metallurgy, transportation, textiles, pharmaceuticals, and grain processing.

The explosion-proof performance of this series of motors complies with the provisions of GB 3836.1-2010 "Explosive Atmosphere Part 1: General Requirements for Equipment" and GB 3836.5-2004 "Electrical Equipment for Explosive Gas Atmosphere Part 5: Positive Pressure Shell Type" p ". The basic performance of the electric motor complies with GB 755-2008 "Rating and Performance of Rotating Electrical Machines". The motor can be made into two explosion-proof types, Expx and Expz, with Expx explosion-proof type suitable for Zone 1 and Zone 2, and Expz explosion-proof type suitable for Zone 2. The two explosion-proof types are respectively suitable for explosive gas environments formed by combustible gases, vapors or mists with ignition temperatures of T1, T2, T3, T4 groups and air in factories. The positive pressure shell Expx can also be used for Class I equipment.

The basic data of the motors covered by this sample are as follows:

Machine base number: 315mm-630mm;

Synchronous speed: 3000r/min, 1500 r/min, 1000 r/min, 750 r/min, 600 r/min, 500 r/min;

Rated voltage: 6kV, 10kV (other voltage motors can also be manufactured according to order requirements);

Rated frequency: 50Hz (60Hz motors can also be manufactured according to order requirements (except for 2-pole motors));

Power range: 160kW -4500kW;

YZYKK positive pressure explosion-proof motorstructural characteristics

The electric motor adopts a box shaped structure, and the base is welded into a box shape from steel plates, which is lightweight and has good rigidity. Install an air to air cooler on the top of the motor, equipped with an inlet and outlet air temperature gauge.

The stator adopts an external pressure structure, and the stator winding adopts 155 (F) level insulation. The 10kV motor adopts reliable anti corona measures, and the winding ends are reliably fixed and tied, and treated with vacuum pressure impregnation solvent-free paint process (VPI). Therefore, the motor has good insulation performance, high mechanical strength, strong moisture resistance, and long service life.

The squirrel cage rotor is manufactured using advanced and reliable aluminum casting or welding processes, and has undergone dynamic balance verification, ensuring smooth and reliable operation of the motor.

The bearings are in two forms: rolling bearings and sliding bearings, depending on the power and speed of the motor. Their protection level is IP54 or IP55, and the rolling bearings are equipped with non-stop oil injection and discharge devices.

The main junction box is placed on the right side of the motor (viewed from the shaft extension end), or can be placed on the left side according to user requirements. Both the inside and outside of the junction box are equipped with separate grounding terminals. When the power is ≥ 2000kW, the motor is equipped with a neutral point junction box.

Install temperature measuring devices in important parts such as stator windings and bearings for remote monitoring to ensure safe and reliable operation of the motor.

The motor is equipped with ventilation and leakage compensation devices. Before starting the motor, the combustible gas inside the motor cavity is effectively replaced (otherwise the interlock signal of the device does not allow the motor to start). After that, the device gives a driving signal, and the motor enters the automatic leakage compensation state. During operation, the appropriate pressure inside the cavity is automatically maintained (the minimum positive pressure value should be at least 50Pa higher than the external pressure) to prevent combustible gas from entering the interior of the shell. When the pressure is too low or loses pressure and normal leakage compensation cannot be guaranteed, the system will automatically alarm or cut off the system power supply.

YZYKK positive pressure explosion-proof motorStandards adopted

GB 755-2008 Rotating Electrical Machinery Rating and Performance (neq IEC60034-1:1993)

GB/T 997-2008 Classification of Structural Types, Installation Types, and Terminal Box Positions for Rotating Electrical Machines (eqv IEC 60034-7:2001)

GB/T 1993-1993 Cooling Methods for Rotating Electrical Machines (eqv IEC60034-6:1991)

GB 3836.1-2010 Explosive Atmosphere Part 1: General Requirements for Equipment (IEC 60079-0:2007, EQV)

GB 3836.2-2010 Explosive Atmosphere Part 2: Equipment Protected by Flameproof Enclosures "d" (IEC 60079-1:2007, EQV)

GB 3836.3-2010 Explosive Atmosphere Part 3: Equipment Protected by Increased Safety Type "e" (IEC 60079-7:2006, EQV)

GB 3836.5-2004 Electrical equipment for explosive gas atmospheres - Part 5: Positive pressure enclosure type "p" (IEC 60079-2:2001, MOD)

GB/T 4772.2 Dimensions and output power levels of rotating electrical machines - Part 2: Machine frame numbers 355-1000 and flange numbers 1180-2360 (idt IEC 60072-2:1990)

GB/T 4942.1-2006 Protection level (IP code) for integral structure of rotating electrical machines (idt IEC60034-5:2000)

GB 10068-2008 Measurement, Evaluation, and Limits of Mechanical Vibration for Motors with Shaft Center Height of 56mm and Above (idt IEC60034-14:2007)

GB 10069.3-2008 Methods and Limits for Noise Determination of Rotating Electrical Machines Part 3: Noise Limits (neq IEC60034-9)

YZYKK positive pressure explosion-proof motorThe meaning of model

Rated voltage and rated frequency

The rated voltage of the motor is 6kV and 10kV, and the rated frequency of the power supply is 50Hz.

Thermal classification and temperature rise limit

The insulation level of the electric motor is 155 (F), and the temperature rise limit is 80K when assessed according to 130 (B) level.

Bearing structure form and temperature limit

The bearing structure is divided into two types: rolling bearings and sliding bearings. For specific structural forms, please refer to the appearance and installation dimension data table. The normal product of sliding bearing structure is forced lubrication, but it can also be made into self-lubricating according to needs. When the sliding bearing is forcibly lubricated, the bearing alarm temperature is 75 ℃ and the shutdown temperature is 80 ℃. When the rolling bearing and sliding bearing are self-lubricating, the bearing alarm temperature is 90 ℃ and the shutdown temperature is 95 ℃.

Explosion-proof marking

Before explaining the selection of explosion-proof markings for positive pressure shell type motors, a brief explanation of the explosion-proof area should be provided using graphical methods, as shown in Figure 1.

Figure 1 Explosion proof area and explosion-proof type of motor

According to GB 3836.5-2004 "Electrical equipment for explosive gas atmospheres - Part 5: Positive pressure shell type" P "", the classification of explosion-proof markings for positive pressure shell type motors is as follows:

When used for Class I equipment (electrical equipment for coal mines): ExPxI;

用于1区爆炸性气体环境时： ExPxⅡCT1～T4、ExdepxⅡCT1～T4、ExdpxⅡCT1～T4、ExepxⅡCT1～T4；

用于2区爆炸性气体环境时： ExpzIICT1～T4、ExdepzⅡCT1～T4、ExdpzⅡC T1～T4、Exepz CT1～T4；

Suitable for equipment in explosive gas environments formed by combustible gases, vapors, or mists with ignition temperatures of T1, T2, T3, T4 groups and air in factories. Motors suitable for Zone 1 explosive gas environments can also be used for Zone 2 explosive gas environments.

Protection level

The protection level of the motor is IP54, IP55.

cooling method

The cooling methods for electric motors are IC611 and IC616.

Types of climate protection and environmental conditions for use

Damp heat type, with climate protection areas (TH); Damp heat type, no climate protection location (THW);

Dry hot type, with climate protection areas (TA); Dry hot type, no climate protection location (TAW);

Tropical type, with climate protection facilities (T); Tropical type, no climate protection site (TW);

户外防轻腐蚀型 （W）；

Outdoor medium corrosion protection type (WF1);

户外防强腐蚀型 （WF2）；

户内防中等腐蚀型 （F1）；

Indoor anti-corrosion type (F2);

The above protection types are marked after the motor model, for example: YZYKK560-4WF1.

接线方式

Y-shaped connection method.

Cable entry device

Under normal circumstances, rubber sheathed cable devices are provided for the motor, and steel pipe wiring devices or armored cable devices can be provided according to user needs.

working system

The work schedule is S1 continuous work schedule, or intermittent work schedule can be made according to user needs.

Performance indicator tolerance

Efficiency η: -10% (1- η);

Power factor cos φ: - (1-cos φ)/6;

Minimum absolute value 0.02;

The maximum absolute value is 0.07;

Locked rotor current:+20% of the guaranteed current value;

Locking torque: -15% of the torque guarantee value;

Minimum torque: -15% of the guaranteed torque value;

Maximum torque: -10% of the torque guarantee value.

On site operating conditions

1. The altitude shall not exceed 1000m.

2. The ambient air temperature shall not exceed 40 ℃.

3. The ambient air temperature should not be lower than -15 ℃, and the ambient temperature for motors with sliding bearings or air water cooling should not be lower than 0 ℃.

4. Tolerance values for voltage and frequency：

Electric motors can operate continuously within ± 5% of rated voltage and ± 2% of rated frequency, and achieve their basic functions. However, their performance may differ from that at rated voltage and frequency, and the temperature rise may be higher than that at rated voltage and frequency.

Electric motors can operate within ± 10% of rated voltage and within+3% to -5% of rated frequency, and achieve their basic functions. However, their performance may differ from that at rated voltage and frequency, and the temperature rise may be higher than that at rated voltage and frequency.

Other electrical operating conditions of the electric motor shall comply with GB755.

Starting requirements

When the driven machinery is a water pump or fan equipment, the user's power grid must ensure that the motor terminal voltage during the starting process is not less than 85% of the rated voltage.

Under the above conditions, the motor is allowed to start continuously twice in the actual cold state, or once in the hot state. The motor should stop naturally between the two starts, and any additional restart should be done after 1 hour of shutdown.

Load connection

Usually, the electric motor and the driven load are connected elastically.

Measurement and Protection

1. The motor is equipped with measuring devices such as bearing temperature measurement and stator temperature measurement. The temperature measuring element is a platinum thermistor Pt100, and the output signals are all resistance signals. The wiring diagram for stator and bearing temperature measurement is shown in Figure 2.

Figure 2: Wiring diagram for temperature measurement of stator bearings

2. The electric motor is equipped with an anti condensation space heater, with a power supply voltage of AC 220V. The wiring diagram of the heater is shown in Figure 3.

Figure 3 Heater wiring diagram

3. When the motor power is ≥ 2000kW, in order to facilitate differential protection for users, the motor is equipped with a neutral point junction box.