BT4 high-voltage variable frequency explosion-proof motor
Petrochemical (pumps, reactor agitators), natural gas (compressors, LNG storage tank pumps), textile coatings (fans, agitators), etc., in flammable and explosive gas environments, meeting the needs of high-power drive and energy saving.
Keyword: BT4 high-voltage variable frequency explosion-proof motor
Product Overview
The BT4 high-voltage variable frequency explosion-proof motor is designed for hazardous environments with explosive gases, reaching an explosion-proof grade of Ex d IIB T4. Among these, "Ex" is the explosion-proof mark; "d" represents the flameproof type, an explosion-proof technology that uses a robust enclosure to isolate electrical components that may generate sparks, arcs, and hazardous temperatures from the surrounding explosive gas mixture; "IIB" indicates suitability for Class IIB explosive gas environments in factories, such as common gases like ethylene and benzene; "T4" indicates that the maximum surface temperature of the motor does not exceed 135℃, effectively preventing the explosion of surrounding combustible gases due to high surface temperature.
Product Applications
Petrochemicals (pumps, reactor agitators), natural gas (compressors, LNG tank pumps), textile coatings (fans, agitators), etc., in flammable and explosive gas environments, meeting the needs of high-power drive and energy saving.
Product Features
The BT4 high-voltage variable frequency explosion-proof motor has five core features: excellent explosion-proof performance, flameproof enclosure can withstand pressure above 1.5 MPa, conforms to GB 3836 standard, suitable for Class IIB gas environments; significantly high efficiency and energy saving, energy efficiency reaches IE3 and above, high-voltage design reduces transmission losses; precise and intelligent speed regulation, stepless speed regulation from 30% to 100%, soft start and soft stop reduce impact, supports automated control; strong environmental adaptability, IP55+ protection, wide temperature operation from -20℃ to +50℃, vibration, dust and waterproof; convenient and efficient maintenance, modular structure and independent lubricated bearings, reduce maintenance time and cost.
Operating Conditions
| Environmental Conditions | |
| Explosion-proof Environment | Suitable for Class IIB explosive gas environments in factories, such as ethylene and benzene gas environments, can be used in Zone 1 (continuously present explosive gas mixtures) and Zone 2 (occasionally present explosive gas mixtures) hazardous locations, and the ignition temperature of gases in the environment must be ≥135℃. |
| Environmental Parameters | Ambient air temperature between -20℃ and +40℃; air relative humidity not exceeding 90% (at 25℃); altitude not exceeding 1000m, derating is required if exceeded; the installation location should be free of significant shaking and impact vibrations, and free of corrosive gases and vapors that damage metal and insulation. |
| Electrical Conditions | |
| Power Supply Specifications | Adaptable to high-voltage power supplies such as 3kV, 6kV, and 10kV, voltage deviation is allowed to be ±5% of the rated voltage; rated frequency 50Hz, allowable deviation ±1%, can also be customized as a variable frequency motor; requires the power supply waveform to be approximately sinusoidal, harmonic content not exceeding the specified range, to avoid motor overheating or abnormal vibration. |
| Power Supply System | The high-voltage power grid needs a stable neutral point grounding system, it is recommended to equip with lightning protection devices to prevent overvoltage surges; when the transmission distance is long, the cable capacitance effect needs to be considered, and a reactor should be configured to suppress the closing inrush current if necessary. |
| Mechanical Conditions | |
| Installation Method | Supports standard installation methods such as IMB3 (horizontal, foot-mounted) and IMB5 (vertical, flange-mounted). The mounting base should be flat and have sufficient rigidity to ensure that the motor is securely installed; uses a coupling drive, if other drive methods are required, they should be specified when ordering, and the drive components must be strictly aligned to avoid abnormal bearing wear. |
| Load Characteristics | Suitable for constant torque loads (such as compressors, fans), square torque loads (such as water pumps), etc., avoid frequent forward and reverse rotation or impact loads; when starting directly, the power grid capacity must be sufficient (generally, the motor power does not exceed 20% of the power grid capacity), a soft starter or variable frequency drive can also be used to start, and appropriate starting parameters should be set. |
| Maintenance Conditions | |
| Regular Maintenance | Bearings need to be lubricated regularly, and the specified type of lubricating grease (such as lithium-based grease NLGI 2#) should be added according to the operating hours; measure the winding insulation resistance monthly, using a 2500V megohmmeter, the stator winding insulation resistance should be ≥1MΩ/kV. |
| Operation Monitoring | During operation, the motor temperature should be monitored in real time, using embedded PT100 sensors or infrared temperature measurement, to ensure that the stator winding and bearing temperatures do not exceed the allowable values; use a vibration meter to measure the bearing seat vibration velocity, ensuring that the vibration intensity meets the standard; listen to the motor running sound, and stop and repair immediately if any abnormality is found. |
Technical Parameters
| Frame Size | 355~710 |
| Power Range | 185kW~2240kW |
| Voltage | 3000V~11000V |
| Frequency | 50Hz、60Hz |
| Number of Poles | 2P~12P |
| Thermal Class | 155(F) |
| Temperature Rise Limit | 80K (Class B), 105K (Class F) (maximum one power level for each frame size and each number of poles) |
| Vibration Velocity | 2.3mm/s |
| Efficiency | Level 1 energy efficiency. Complies with GB30254-2013 "Energy efficiency limit values and energy efficiency grades for high-voltage three-phase cage asynchronous motors", energy efficiency level 1. |
| Cooling Method | IC411 |
| Installation Method | IMB3 (can also be made into IMB35, IMV1) |
| Protection Class | IP55 |
| Operating Mode | S1 |
| Explosion-proof Level | xd ⅡB T4 Gb |
| Environment | Temperature -20~+40℃, altitude no higher than 1000 meters |
| Indoor (standard configuration) optional | Outdoor (W), Outdoor moderate corrosion protection (WF1), Outdoor strong corrosion protection (WF2), Indoor moderate corrosion protection (F1), Indoor strong corrosion protection (F2), Humid tropics (TH), Dry tropics (TA), Outdoor humid tropics (THW), Outdoor dry tropics (TAW) |
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Jiangsu Kender Motor Co., Ltd. is a modern motor manufacturing enterprise integrating R&D, production and sales.
Address: No. 18, Nanqiu Road, Huangtu Town, Jiangyin City, Jiangsu Province
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