Source: https://ru.scribd.com/document/201136089/ex09enELECTRIC-MOTORS-IN-EXPLOSION-PROOF-PROTECTION-INCREASED-SAFETY-EExe-FLAMEPROOF-ENCLOSURE-EExd
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ex09enELECTRIC MOTORS IN EXPLOSION - PROOF PROTECTION INCREASED SAFETY EExe FLAMEPROOF ENCLOSURE EExd | Mechanical Engineering | Nature
ELECTRIC MOTORS IN EXPLOSION - PROOF PROTECTION INCREASED SAFETY EExe FLAMEPROOF ENCLOSURE EExd
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Crouse-Hinds series full line catalogue.pdf
950_spec IP Tranducer
FilterSense, Manual, EM 30T v2.02, Installation and Operating
EX 0 9EN
Serial Motors
1.2 DESIGNATION OF DESIGN
1.3 STANDARDS AND DIRECTIVES
1.3.1 Review of basic standards and directives
1.3.2 Release, hazardous areas and zones
1.3.3 Temperature classes and groups of gases
1.4.1 Mounting arrangements of electric motors
1.4.2 Shaft extension
1.4.3 Balancing and vibrations
1.4.4 Noise
1.4.5 Surface protection
1.4.6 Rating plates
1.5.1 Voltage and frequency
1.5.2 Terminals and winding connection
1.5.4 Overloading and starting
1.5.5 Insulation and heating
1.5.6 Inverter fed motors
2. MOTORS IN PROTECTION OF INCREASED SAFETY EExe
2.1 EXPLOSION-PROOF PROTECTION OF INCREASED SAFETY EExe
2.2 DESIGN, TAKEOVER AND APPLICATION OF MOTORS IN PROTECTION EExe 8
2.2.2 Overload protection
2.2.4 Technical acceptance and certification
2.3.1 Mechanical protection
2.3.2 Tabular review of constructional materials
2.3.3 Bearing arrangement
TECHNICAL DATA FOR SELECTION 11
3. MOTORS IN PROTECTION OF FLAMEPROOF ENCLOSURE EExd 22
3.1 EXPLOSION-PROOF PROTECTION FLAMEPROOF ENCLOSURE EExd
3.2.1 Forms, mechanical protection, constructional characteristics and materials of electric motor
3.2.2 Terminal box and assembly drawings
3.2.3 Bearing arrangement
3.3 TECHNICAL DATA FOR SINGLE-SPEED MOTORS SELECTION 29
3.4 TECHNICAL DATA FOR TWO-SPEED MOTORS SELECTION
3.5 OUTLINE DRAWINGS
4. QUESTIONNAIRE FOR EEx MOTORS
ELECTRIC MOTORS IN EXPLOSION-PROOF PROTECTION EExe and EExd
Explosion-proof tree-phase induction electric motors in this catalogue, refer to the design of increased safety - EExe and flameproof enclosure - EExd. These motors are applied in industrial plants, in which danger can occur from explosion of inflammable vapours or gases (e.g. chemical industry, petrochemical industry, oil refinery, textile industry) and also in mines, which are dangerous because of methane and inflammable dust.
is in conformity with standards EN 50014 and EN 50019 while the
design flameproof enclosure is in conformity with EN 50014 and EN 50018.
Design increased safety
Designation of electric motors manufactured by ATB SEVER according to the mentioned designs is done as follows:
Design increased safety - EExe
1 . S Z K (R)T
increased safety totally enclosed design squirrel cage rotor el. motor for gear box thermal protection shaft height (frame size) [mm] stack length number of poles
Design flameproof enclosure - EExd
el. motor for gear box
shaft height (frame size) [mm]
1 . Z K R
Marking Terminology to 94/ 9 / EC
Reference EN 50014
committee of Italy
CEI 2-3355
CEI2 -6
CEI 70-1519
CEI 2/No-454
CEI-UNEL 05513
CEI 2-8V1
No 5628
Draft of Italian standard P288
CEI-UNEL 13117
CEI 31-8459
CEI 31-1472
BS- British
BS 4999: P1 BS 4999: P69
BS 4999-34
BS 4999: P20
BS 4999: P21
BS 4999: P22
BS 4999: P23
BS 4999: P51
BS 4999: P50
BS 4999: P10
BS 5501: P1
BS 5501: P5
BS 5501: P6
DIN/VDE- German industry norms- Association of German
DIN EN 60034-1/ VDE 0530, part 1
DIN EN 60034-2/ VDE 0530, part 2
DIN EN 60034-5/ VDE 0530, part 5
DIN EN 60034-6/ VDE 0530, part 5
DIN EN 60034-7/ VDE 0530, part 5
DIN/VDE 0530, part 8
DIN EN 60034-9/ VDE 0530, part 9
DIN/VDE 0530, part 12
DIN/VDE 0530, part 14 DIN ISO 2373
DIN 42673, part 3
DIN EN 50018/ VDE 0171, part 5
DIN EN 50019/ VDE 0171/ part 6
International referent standards
EN-CENELEC European committee for el. tech.norms.
EN 60034-2
EN 60034-6
EN 60072
IEC 60034,part 1
IEC60085
IEC 60034, part 2
IEC 60034, part 5
IEC 60034, part 6
IEC 60034, part 7
IEC 60034, part 8
IEC 60034, part 9
IEC 60034, part 12
IEC 60034, part 14
IEC 60079, part 0
IEC 60079, part 1
IEC 60079, part 7
Rotating electrical machines, Rating and performances
Noise limits values
Mechanical vibrations, limit values
Electrical apparatus for explosive gas atmospheres - General provisions
Electrical apparatus for explosive gas atmospheres - Flame-proof enclosure EExd
atmospheres - increased safety EExe
The explosion-proof protection motors covered by the new Directive 94/9/EC must also meet the requirements of other relevant Directives: Low Voltage Directive 73/23/EEC, modified by 93/68/EEC; Electromagnetic Compatibility Directive 89/336/EEC, modified by 92/31/EEC and 93/68/EEC and Machinery Directive 98/37/EC.
The source of release is the place which contains inflammable medium or from which the inflammable medium goes out. Inflammable medium is considered to be, as follows:
♦ the explosive mixture of gases, vapours and dust,
♦ medium-air mixture can make explosive atmosphere.
Regarding the way of formation and duration of explosive mixtures, sources of release are classified as permanent, primary and secondary sources of release. Permanent sources of release contain or emit permanently inflammable medium or explosive mixture into the surrounding space. Primary sources of release, occasionally, at normal operation, contain or emit inflammable medium or mixture into the surrounding space. Secondary sources of release, only under abnormal circumstances, i.e. in case of damage of the plant or incorrect technological process, emit inflammable medium or mixture into the surrounding space. The sources of release can be multi-stage, and in determining hazardous area every stage will be taken into consideration separately. The hazardous area is the space in which explosive atmosphere is present or can be expected. Its presence in the certain quantity requires special measures of precaution, with regard to assembly performance and use of electric devices, tools, machines and accessories which sparks, make electric arc or have heated surfaces.
corresponding Standards and Directives.
In order to occur explosions the existing mixture must be ignited initially. For initial ignition its source must have enough power and temperature above the minimum temperature of ignition of this mixture. Gases and vapours are classified in the following temperature classes, on the basis of ignition temperature measured by a method and with a device in accordance with the corresponding standard.
This standard provides data of group of gases, temperature classes, max. experimental safety gap, ignition temperature and ratio of minimal ignition current and minimal ignition current of laboratory methane, for 156 gases and vapours, which can form explosive mixtures. The most hazardous gases are: acetylene, hydrogen, carbon disulfide, are in the group C; ethylene, methyl acrylate, dimethyl ethane and some other gases are in the group B; while most of them are in the group A (methane, ethane, amyl-acetone, ammonia, benzol, butane, propane and masout).
1.4 MECHANICAL CHARACTERISTICS
Motors are manufactured with one cylindrical shaft extension. On a special request, they can be manufactured also with two shaft extensions, with a tape shaft extension and with other special forms. The dimensions of shaft extension, keys and keyway dimensions are in conformity with the IEC 60072-1. The dimensions of tapped hole in shaft are shown in the following table. In order to keep load of bearings and of shaft extension within the allowed limits, there must be paid attention to radial and axial forces and to the type of transmission from a motor to a working machine.
All motors are balanced dinamically with half key on a drive shaft extension in quality which corresponds to DIN ISO 2373. Measurement evaluation and limits of vibration are according to IEC 60034 part 14. The data are shown in the following table. Motors with vibration degree "R" (reduced) or "S" (special) are available on a special request.
[mms -1 ]
Max. effective value of vibration speed for
shaft height H [mm]
Machines measured in a state of free suspension
132 < H ≤ 225
H > 225
600≤1800
>1800≤3600
Motors satisfy the noise level emission in accordance to standard IEC 60034, Part 9.
Final surface protection of motor is performed by alkyd color, type RAL 7001. Motors for exploitation in special atmospheric conditions according to IEC 529 (EN 60529) are available on a special request.
Rated and inspection data are in the same rating plate fixed on the enclosure. A duplicate of the plate is located in the cover of the terminal box. The plates are made of stainless steel.
Motors are designed for rated voltage 400 V ±10%, 50 Hz according to IEC 60038. Motors up to 1,5 kW are connected in star (Y), and above that in delta (∆). On a special request motors can be designed for other voltages as well, as it is shown in the following table, up to 690 V and for frequency from 42 to 60 Hz.
Motors are manufactured with six winding terminals which are marked as: U1, V1, W1, U2, V2, and W2. Stator winding are made in connection star (Y) for motors up to 1.5 kW and delta (∆) for other motors. Motors in delta connection need special measures for motor protection.
Stator winding in ∆ connection
Stator winding in Y connection
Two-speed motors with a speed ratio 2:1 are made with Dahlander windings, while the motors with a pole ratio 4/6 or 8/6 are made with two separate stator windings in star connection.
The rated motor outputs, given in selection tables are for continuous running duty. This means that motors have to be connected to the network of rated voltage and frequency, while ambient temperature must not exceed 40 °C and the altitude must be up to 1000 m.
According to IEC 60034-1, motors can be overloaded, meaning that motors heated to an operating temperature can withstand current equal to 1.5 times the rated current for not less than 2 minutes. The same way they can be overloaded by the torque 1.6 times the rated one for 15 seconds without stalling or abrupt change in speed. Overcurrent relays, which must be applied in conformity with the regulations for hazardous areas, allow limited starting time. This means that flywheel masses, which accelerate during start, are also limited.
Windings are designed with insulation of thermal class F. A motor temperature rise satisfies both thermal class B, which is 80 K over the maximum ambient temperature of 40 0 C, and temperature class T4.
Motors are suitable for operation by frequency inverter since the winding insulation of the motors endures certain voltage overloading. Generally, motors operated by inverters have higher noise level. During operation by inverter, the motors have additional load losses, which affect the output torque, depending on a speed ratio, characteristics of working machine, type of cooling (self-ventilated or an additional, external fan) and on the type of inverter, as well. Therefore when placing an order it is necessary to note that the motor will be operated by inverter. It is also necessary to define the speed ratio and characteristics of the working machine P=f(n) or M=f(n).
Concerning electric motors in explosion-proof protection of increased safety "EExe" there have been taken measures, which prevent occurrence of sparking, electric arcs or excessive temperatures during operation of machine.
2.2 DESIGN, TAKEOVER AND APPLICATION OF MOTORS IN PROTECTION EExe
Electric motors are in an enclosure which protects against penetration
impurities. Besides the enclosure, protection is consisted of:
of dust, particles and other
♦ good insulating material (non-hygroscopic, thermostable, mechanically strong, non-flammable, self-extinguishing and resistant to leakage currents)
♦ good mechanical protection (terminal box IP54, enclosure IP44)
♦ allowed heating in the limits of temperature class T1 - T4; insulation class F (H class on a special request)
♦ winding impregnation (vacuum system and submerging)
♦ expert supervision and handling
Basic protection against overloading is an overcurrent protecting device (e.g. a motor protection switch). Besides current control in normal operation in case of locked rotor, the protection device also has to disconnect a motor within time t E , which is given in a rating plate of the motor. Triggering characteristics of a trigger or of a relay with thermal tensioning are based on the initial temperature of 20°C. The applied protecting device (trigger or relay) must have a suitable characteristics ˘ current ratio/time, which provides time of disconnection in the function of the motor current ratio ˘ I P /I N . In addition, the protection device must have the possibility of connecting / disconnecting currents higher than the locked-rotor current I p . The current dependant protecting devices are effective only with continuous (non-intermittent) duty and normal starting conditions, which do not cause overheating. For difficult starting conditions and for intermittent duties, the special protecting devices must provide that limit temperatures are never exceeded (during starting, too). It is
A - the highest ambient temperature
B - temperature under rated load
C - limit temperature
t - time ϑ - temperature 1 - temperature rise in operation under rated load 2 - temperature rise during locked-rotor testing
ϑ [
considered that there are difficult starting conditions, if a motor protecting device disconnects the motor before it reaches its rated speed. The t E time taken for windings, when carrying the locked-rotor current I p , to be heated up from the temperature reached in rated operation and at maximum ambient temperature to the limiting temperature. The t E time is never less than 5 seconds. Appropriate protecting device to disconnect the motor within the t E time is essential. In case of difficult starting conditions, either motors of special design or double-stage overcurrent protection in combination with a relay for automatic control of speed and starting time are being used. Devices for direct control of winding temperature with sensors placed in the winding (e.g. PTC sensors) can also be applied,
but performance of such protection must be proved by testing together with a motor for all duty conditions (starting, continuous operation, disturbances, locked rotor). This is indicated in a suitable way. In case of intermittent duty, heating is supervised by continuous secondary protection with two, three or more time constants, depending on the motor output.
The motors can be applied in hazardous areas, where explosive atmosphere, such as mixtures of gases, fumes or vapour occur occasionally, but in accordance with temperature class rated in a motor rating plate. Valid technical regulations, which determine the installation of motor in hazardous areas, are to be paid attention.
Technical acceptance and certification of motor in explosion-proof protection is performed according to defined procedures of authorized institutions and low regulations. ATB SEVER has certified its products both in the Yugoslav authorized institution - FEDERAL INSTITUTION for STANDARDIZATION, Belgrade, and in Danish authorized institution DEMCO, Denmark.
Motors are designed in mechanical protection IP55 (IEC 60034-5 and EN 60034-5).
Constructional elements of electric motor
Fan for both way rotation
together with frame
The technical solution of bearing arrangement provides even and long-term operation of a motor. Characteristics and dimensions of bearings are shown in the Table 1. on page 10.
Grease for re- lubrication
Time of re-lubrication [h]
1.SZK 63
1.SZK 71
1.SZK 80
1.SZK 90
For life lubricated
2.SZK 100
2.SZK 112
1.SZK 132 M, L
1.SZK 160 M, L
1.SZK 180 M, L
1.SZK 200 L
1.SZK 225 M, S
1.SZK 250 M
1.SZK 280 M, S
1.SZK 315 M, S
SZK 315 M, S
SZK 71 - 112
1.SZK 180 - 225
SZK 132
1.SZK 250 i
SZK 315
1.SZK 160
1.SZK 280
Bearing arrangement of electric motor in increased safety EExe
2.4 TECHNICAL DATA FOR SELECTION
3000 min -1 , 400 V, 50 Hz, Insulation class: F, Mechanical protection: IP 55, Temperature class: T1-T4.
SZK 90
Sk-2B
Sk-2C
Mk-2A
Mk-2C
SZK 180
Lk-2A
1.SZK 200
Lk-2B
1.SZK 225
1.SZK 250
Note: Electric motors of frame size 355 and over on a special request !
1500 min -1 , 400 V, 50 Hz, Insulation class: F, Mechanical protection: IP 55, Temperature class: T1-T4.