Rotating electrical machines - Efficiency classes of high voltage AC motors (IE-code)

Rotating electrical machines - Efficiency classes of high voltage AC motors (IE-code)

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1   Scope

This part of IEC 60034 specifies efficiency classes for fixed-speed three-phase high-voltage cage induction motors in accordance with IEC 60034‑1 that
  • • have a rated voltage exceeding 1 000 V, but not exceeding 11 kV;
  • • have a rated power from 200 kW to 2 000 kW;

    NOTE 1 Motors with rated power above 2 000 kW are produced in such small numbers and are designed and produced with a focus on achieving an optimum efficiency anyway, even though fulfilling increasingly special requirements that assigning efficiency classes would be an additional effort without the result of any countable energy saving.

  • • have two, four or six poles;
  • • are rated for single-speed line-operation;
  • • are intended for direct-on-line starting at rated or at reduced voltage and rated frequency;
  • • are constructed to any degree of protection;
  • • are designed for cooling methods IC411, IC511, IC611, IC01 or IC81W;
  • • are capable of continuous operation at their rated operating point (torque/power, speed) with a temperature rise within the specified insulation temperature class;

    NOTE 2 Most motors covered by this document are rated for duty type S1 (continuous duty). However, some motors that are rated for other duty cycles are still capable of continuous operation at their rated power and these motors are also covered.

  • • are rated for any ambient temperature or coolant temperature within the range of − 20 °C to + 60 °C;

    NOTE 3 Motors rated for temperatures outside the range − 20 °C and + 60 °C are considered to be of special construction and are consequently excluded from this document.

  • • are rated for an operating altitude up to 2 000 m above sea level;

    NOTE 4 The rated efficiency and the efficiency class are based on a rating for altitudes up to 1 000 m above sea level.

  • • have a locked-rotor current Il at stand-still and supply with rated voltage and frequency before application of any IEC or agreed tolerance in the range Il / IN ≥ 4,5;
  • • are designed for a customer load torque during starting not exceeding an envelope with a minimum of 25 % of the rated torque at low speed and a square shape T ~ n2 up to a maximum load torque at full speed of 60 % of the rated torque in case of 2 pole motors or 100 % of the rated torque in case of 4 pole or 6 pole motors, respectively, (see Figure 1), After starting is completed, the load torque of 2 pole motors is increased to 100 % of the rated torque;
  • • have to accelerate an external moment of inertia as defined by the customer requirements not exceeding the values given in Table 1 considering all start up conditions defined in this document for not more than three consecutive starts from cold condition or two starts from hot condition, respectively;
  • • are designed for a minimum locked-rotor steady state supply voltage of at least 80 % of the rated voltage during starting.
Figure 1 — Envelope of the load torque during starting: Load torque during starting in % of rated torque over speed in % of rated speed
fig-1
Table 1 — Maximum external moment of inertia
Number of poles 2 4 6
Frequency Hz 50 60 50 60 50 60
Rated output
kW
Moment of inertia J
kg m2
200 25 15 115 75 310 200
220 25 15 120 80 330 210
250 25 15 130 85 360 230
280 30 20 140 90 400 250
315 30 20 150 100 440 270
355 35 20 170 110 480 300
400 35 25 190 120 530 330
450 40 25 210 130 580 360
500 45 30 230 140 640 400
560 50 30 250 150 700 440
630 55 35 280 170 780 490
710 60 35 310 190 870 550
800 65 40 340 210 970 610
900 70 45 380 230 1 100 680
1 000 80 50 420 260 1 200 750
1 120 90 55 460 290 1 300 830
1 250 100 60 510 320 1 450 920
1 400 110 65 570 360 1 650 1 000
1 600 120 70 640 400 1 850 1 150
1 800 130 80 720 440 2 050 1 300
2 000 150 90 800 490 2 300 1 450

NOTE 1 The values of the moment of inertia given are in terms of mr2 where m is the mass and r is the mean radius of gyration.

NOTE 2 Moment of inertia is defined in ISO 3: 1973, 3.7.

NOTE 3 If necessary, linear interpolation is permitted between two adjacent values.

Excluded are:
  • • Motors with mechanical commutators or slip-rings;
  • • Motors with 8 or more poles;
  • • Multi-speed motors;
  • • Motors with customer starting torque requirements exceeding the load torque envelope above, and motors exceeding the maximum external inertia defined in Table 1;
  • • Motors designed specifically for operation fed by a power electronic frequency converter with a temperature rise within the specified insulation thermal class or thermal class;
  • • Motors completely integrated with the driven machine (for example pumps, fans and compressors). This means that the motor cannot be designed in such a way as to enable the motor to be separated from the driven unit, i.e. it is not possible to operate the separated motor without the driven unit;
  • • Submersible motors specifically designed to operate wholly immersed in a liquid;
  • • Smoke extraction motors;
  • • Motors dedicated to operate in explosive atmospheres;
  • • Motors for operation in nuclear plants, especially nuclear power plants.