Induction three-phase electric motors for nuclear power plants

Для работы на АЭС 4AS_80_B4_A5.jpg

Electric motors for NPP can be manufactured in two versions:

for drive of armature, placed under protective cover of NPP reactor room (4АС80А5 motor)
for drive of equipment, placed in “clean” premises and “dirty” boxes of NPP (AIR 80 А3, AIR 90 А3 motors).

1. Electric motors manufactured in accordance with Technical Specifications 16-510.610-76 are aimed for drive of armature, placed under protective cover of NPP reactor room and have technical characteristics mentioned in the table below:

Technical characteristics in case of 380 V, frequency of 50 Hz

Type	Output, kW	Rotation speed, rpm,	Efficiency, %	Cos φ	М_start —— М_nom	М_max —— М_nom	Slip, %	Specific weight, kg/kW
4AS 80 А4 А5	1.30	1500	62	0.70	20.5	20.5	8	18.5
4AS 80 В4 А5	1.70	1500	64	0.65	30	30	7	15.0

The motors are manufactured in IM3081 version by governmental standard GOST 2470-79. The motors are hermetic, manufactured entirely in cast iron housing, without self-cooling fan. Protective degree of these electric motors is IPX7 in accordance with governmental standard GOST 14254-96; along the shaft line from the side of free shaft end in bearing shield should be set sealing ring in accordance with governmental standard 8752-79 and additionally should be provided by mechanism while joining motor with electric drive.

These electric motors are designed according to the first category of seismic stability (up to 8G in manufacturing sphere). Average life time is not less than 10 years with operating time of 100 hours per year. These electric motors are designed for operation in environment under protective cover and keep operability during such modes as "disfunction of heat-removal", "small" and "big" leak.

2. Electric motors manufactured in accordance with Technical Specifications 16-89 IAKF 525000.018 TY are aimed for drive of equipment, place in “clean” premises and “dirty” boxes of NPP (out of hermetic zone). Protective degree of these electric motors is IP55 in accordance with governmental standard GOST 17494-87, along the shaft line – IP44. These electric motors are designed according to the first category of seismic stability, for the regions with earthquake intensity up to 9 grade, seismic load with acceleration of 2d in the range of 2,5 to 50 Hz. Average life is not less than 20 000 hours. The motors are irreparable.

Technical characteristics in case of 380 V, frequency of 50 Hz

Type	Output, kW	Rotation speed, rpm	Efficiency, %	Cos φ	М_start —— М_nom	М_max —— М_nom	I_start —— I_nom	Average noise level, dB(A)	Weight, kg IM 1081
AIR 80 A2 A3	1.5	3000	81.0	0.85	2.1	2.2	7.0	70	8.27
AIR 80 B2 A3	2.2	3000	83.0	0.87	2.0	2.2	7.7	70	6.82
AIR 90 L2 A3	3.0	3000	84.5	0.88	2.0	2.2	7.0	73	6.33
AIR 80 A4 A3	1.1	1500	75.0	0.81	2.2	2.2	5.5	61	10.82
AIR 80 B4 A3	1.5	1500	78.0	0.83	2.2	2.2	5.5	63	9.20
AIR 90 L4 A3	2.2	1500	81.0	0.83	2.1	2.2	6.5	63	8.45
AIR 80 A6 A3	0.75	1000	70.0	0.72	2.0	2.2	4.5	60	15.47
AIR 80 B6 A3	1.1	1000	74.0	0.74	2.0	2.2	4.5	60	13.91
AIR 90 L6 A3	1.5	1000	76.0	0.72	2.0	2.2	6.0	60	12.67
AIR 80 А8 А3	0.37	750	60.0	0.61	1.8	1.9	4.0	57	37.20
AIR 80 B8 A3	0.55	750	64.0	0.63	1.8	1.9	4.0	57	27.20
AIR 90 LA8 А3	0.75	750	75.0	0.73	1.4	2.0	4.0	57	22.90
AIR 90 LB8 A3	1.1	750	77.0	0.72	1.4	2.0	3.5	57	18.30
	With increased speed
AIR 80 A2 A3	1.9	3000	79.0	0.80	2.1	2.2	6.5	75	6.56
AIR 80 B2 A3	2.5	3000	76.0	0.86	2.1	2.2	6.5	75	6.00
AIR 90 L2 A3	3.5	3000	80.0	0.86	2.0	2.2	6.5	78	5.57
AIR 80 A4 A3	1.32	1500	69.0	0.80	2.1	2.2	5.0	66	9.00
AIR 80 B4 A3	1.7	1500	71.0	0.82	2.1	2.2	5.0	68	8.10
AIR 90 L4 A3	2.4	1500	77.0	0.81	2.2	2.2	6.0	68	7.75
AIR 80 A6 A3	0.75	1000	67.0	0.73	2.0	2.1	4.0	65	15.40
AIR 80 B6 A3	1.25	1000	66.5	0.73	2.1	2.1	4.0	65	12.20
AIR 90 L6 A3	1.7	1000	71.0	0.72	2.0	2.2	6.0	65	11.30
AIR 80 А8 А3	0.45	750	56.0	0.57	1.8	1.9	4.0	62	37.30
AIR 80 B8 A3	0.6	750	60.0	0.60	1.8	1.9	4.0	62	28.20
AIR 90 LA8 А3	0.9	750	69.0	0.72	1.6	1.9	3.5	62	20.50
AIR 90 LB8 A3	1.2	750	67.0	0.72	1.6	1.9	3.5	62	18.30