Types of HRC fuse (Industrial application)

Knife Edge Fuses (DIN Type)

·         6- 800 amps

·         Available in various sizes such size 000,size 00,size 0,size 1, size 2, size 3

KNIFE EDGE TYPE FUSE

 Bolted Type Fuse (BS Type)

·         Up to 800 amps

·         Available in various tags :- Offset Tag, Central Tag (two hole fixing), Central Tag( four hole fixing), 'J' type

·         Available in various sizes (F1, A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3)

BOLTED FUSE WITH CENTRAL TAG

BOLTED FUSE WITH OFFSET TAG

BOLTED FUSE WITH CENTRAL TAG
(FOUR HOLE FIXING)

'J' TYPE FUSE

Cylindrical Fuse

·         Up to 100 amps

·         Standard sizes 10x38, 14x51, 22x58, 30x57

 

CYLINDRICAL TYPE FUSE

Clip-on Type Fuse (BS fuse with blade tag)

·         Usually smaller current rating up to 63 amps

·         Offset tags

CLIP-ON TYPE FUSE

Bottle Type Fuse

·         Up to 100 amps

·         Available in standard size

BOTTLE TYPE FUSE

CALCULATION TABLE FOR SLIP RING INDUCTION MOTOR USED FOR CRANE HOISTING APPLICATION

CALCULATION TABLE FOR SLIP RING INDUCTION MOTOR USED FOR CRANE HOISTING APPLICATION
Result contain approximate values for cross-checking only
INPUTS
Power Rating		P2		100	HP
Speed		N		980	RPM
Stator Voltage		E1		415	V
Stator Current		Is		138	A
Rotor Voltage		E2		380	V
Rotor Current		I2		124	A
Synchronous Speed		Ns		1000	RPM
Frequency		f		50	Hz
No.of Steps in Speed Control		n		5
OUTPUTS
Slip		S=(Ns-N)/Ns		0.02
Rotor Frequency		f'=Sf		1	Hz
I2= (SE2)/(√(R22+(SX2)2) For maximum starting torque application S=(R2/X2)= 0.02  Then R2= 0.02 X2 (Approx.) From above two Equations we get Rotor Reactance		X2		2.166940136	Ohm
Rotor Resistance		R2		0.043338803	Ohm
Starting Rotor Current I2s=(E2)/(√(R22+X22) Starting Power Factor  COSØ2s=(R2)/(√(R22+X22) Power Factor (FL)  COSØ2s=(SR2)/(√(R22+(SX2)2) Starting Rotor Current		I2s		175.3274198	A
Starting Power Factor		COSØ2s		0.019996001
Power Factor (FL)		COSØ2		0.707106781
T= (60P2)/(2лNs) T=(KSR2E22)/ (√(R22+(SX2)2) Smax= (R2/X2) Tm=(KE22)/ (2X2) Tstm=(KE22)/ (2R2) Torque (FL)		T		42747.13376	N-m
Torque constant		K		1.282970635
Maximum Slip		Smax		0.02
Maximum Torque		Tm		42747.13376	N-m
Maximum Starting Torque		Tstm		2137356.688	N-m
Pm=(1-S)P2 Pcu=SP2 Tsh=(60P2)/ (2лN) Mechanical Power		Pm		73.0786	kW
Cu loss		Pcu		1.4914	kW
Shaft Torque		Tsh		42747.13376	N-m
R1’,R2’,R3’,R4’,R5’- Total resistance per phase in the rotor circuit  on the 1st, 2nd, 3rd, 4th, 5th Stud respectively r1’,r2’,r3’,r4’,r5’- Total resistance of the different steps R1’=(R2/Smax) k=(Smax)1/n-1 R2’=kR1’ R3’=kR2’=k2R1’ R4’=kR3’=k3R1’ R5’=kR4’=k4R1’		R1'		2.166940136	Ohm
		k		0.376060309
		R2'		0.814900178	Ohm
		R3'		0.306451613	Ohm
		R4'		0.115244288	Ohm
		R5'		0.043338803	Ohm
r1’=R1’-R2’=(1-k)R1’ r2’=R2’-R3’=(k-k2)R1’=kr1’ r3’=k2r1’ r4’=k3r1’ r5’=k4r1’ Resistance 1st Step		r1'		1.352039958	Ohm
Resistance 2nd Step		r2'		0.508448565	Ohm
Resistance 3rd Step		r3'		0.191207325	Ohm
Resistance 4th Step		r4'		0.071905486	Ohm
S1=1 S2=k S3=K2 S4=K3 S5=Smax Slip 1st Step		S1		1
Slip 2nd Step		S2		0.376060309
Slip 3rd Step		S3		0.141421356
Slip 4th Step		S4		0.053182959
Slip 5th Step		S5		0.02
N1=0 N2=(1-S2)Ns N3=(1-S3)Ns N4=(1-S4)Ns N5=N Speed 1st Step		N1		0	RPM
Speed 2nd Step		N2		623.9396907	RPM
Speed 3rd Step		N3		858.5786438	RPM
Speed 4th Step		N4		946.817041	RPM
Speed 5th Step		N5		980	RPM
T=(KSR2E22)/ (√(R22+(SX2)2) Torque 1st Step		T1		1709.20167	N-m
Torque 2nd Step		T2		4534.013993	N-m
Torque 3rd Step		T3		11853.64241	N-m
Torque 4th Step		T4		28167.51282	N-m
Torque 5th Step		T5		42747.13376	N-m