SIPROTEC –
Motor Protection
SIPROTEC –
Motor protection
Protection functions for various
types of motor faults
Fault
Protection
ANSI - No.
n Stator thermal
n Stator thermal overload
49
overload
n Rotor thermal overload
during start
n too long or blocked
n too frequent
n 2 Protection principles for the
n Earth-fault
n Short-circuit
rotor overload protection
n Motor starting time supervision
n Restart inhibit
48
66
49R
n Earth-fault protection
(I0>;U0>; (U0, I0))
50G
64G
n Overcurrent time protection
51
n Current differential protection
50
87
n Loss of phase
n Negative sequence protection (I2/IN)
46
n Bearing overload
n Temperature sensors (RTD‘s)
38
n Overheating of plant
on unloaded drives
n Undercurrent protection,
Active power protection (P<)
37
32U
n Undervoltage
n Undervoltage protection
27
n Asynchronous operation
n Underexcitation protection
40
(Pumps, compressors)
(Starting torque not reached
M ~ U2 or start too long)
(of a synchronous motor)
2
protection
67G
Scope of motor protection functions
provided by SIPROTEC devices.
Protection functions
ANSI
7SJ60
7SJ61
7SJ62
7SJ63/64
7UM61
7UM62
Stator overload protection
49
X
X
X
X
X
X
Starting time supervision
48
X
X
X
X
X
X
Locked rotor protection
48
X
X
X
X
X
X
Restart
inhibit
66,
49R
X
X
X
X
X
X
64G
X 1)
X
X
X
X
50G
X
X
X
X
X
67G
X 1)
X
X
X
X
Earth-fault protection
non-directional
directional
Overcurrent time protection
50, 51
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Current differential protection
87
Negative sequence protection
46
X
38
X 1)
Undercurrent protection
37
X 1)
Active power protection
(P<)
32U
(37)
Undervoltage protection
27
Underexcitation protection
40
Frequency protection
81
Breaker failure protection
50BF
Temperature supervision
(via RTD - module)
nn
X
X1)
Freely programmable
logic (PLC)
Control functions
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Measuring
transducers
Flexible serial
interfaces
1)
1
2
2
2/3
X
2
3
in preparation (7SJ602)
A device that best suits your
requirement can be selected
3
Motor protection
selection table
Asynchronous Motor
< 2MW
100 kW - 500 kW
7SJ60
Basic device
7SJ61
+ more I/O´s
+ control functions
+ flexible serial interfaces
+ better local HMI
(4line display; digital keyboard)
500 kW - (1-2) MW
7SJ62
Basic device
+ control functions
Synchronous Motor
7UM61
(Option:
Generator Basic)
< 10 MW
7UM61
+ more I/O´s (7UM612)
+ control functions
+ high accuracy
+ high sensitivity
+ operating range in a wide
frequency band (11Hz - 68Hz)
7UM62
(Option:
Generator Basic)
or with control functions via
bay mimic diagram in graphic display
7SJ63
Basic device
7SJ64
+ synchro check function
+ high sensitivity
+ extensive control function
+ 1 serial interface more
> 10 MW
> 2 MW
7UM62
+ differential protection
+ control functions
+ high accuracy
+ high sensitivity
+ operating range in a wide
frequency band (11Hz - 68Hz)
+
7UM62
(Option:
Generator Basic)
or with control functions
via bay mimic diagram
in graphic display
+
4
7UM61
(Option:
Generator Basic)
7SJ64
(Option:
Maximum functionality
+ Synchro check)
Application example:
Protection of a small motor
100 kW - 500 kW
A (L 1)
B (L 2)
C (L 3)
ANSI
52
A (L 1)
B (L 2)
C (L 3)
N
7SJ600/602
n Stator thermal overload
protection
49
n Starting time supervision
48
n Earth-fault protection
50G
n Overcurrent time protection
50, 51
n Negative sequence protection
46
Motor
5
Application example:
Protection of a medium sized motor
500 kW - (1-2) MW
A (L 1)
B (L 2)
C (L 3)
A
B
C
ANSI
52
A (L 1)
B (L 2)
C (L 3)
N
7SJ62/63
n Stator thermal overload
protection
IEE
n Restart inhibit
(rotor protection)
VE
C (L 3)
A (L 1)
49
66, 49R
n Starting time supervision
48
n Earth-fault protection
50G
(non-directional,
64G
directional)
67G
n Overcurrent time protection 50, 51
n Negative sequence
Motor
6
protection
46
n Undervoltage protection
27
n Undercurrent protection
37
n Breaker failure protection
50BF
n external RTD - module
38
Application example:
Protection of a large motor
> 2 MW
A (L 1)
B (L 2)
C (L 3)
ANSI
52
e
7UM62
n
VE
R 13
R 14
R 15
VA(L1)
R 17
VB(L2)
VC(L3)
R 18
R 16
J1
J2
J3
J4
J5
R
J6
k
IA(L1)S2
IB(L2)S2
IC(L3)S2
Q8
IEE2
Q7
K 13 +
RTD module
7XV5662
(6 meas.
junctions)
Measuring transducer
for injection of any
analog signal
e.g. speed,
vibration, pressure
To serial
interface
TD2
K 16
K 17 +
TD3
K 18
J7
IEE1
J8
Q1
Q2
Q3
Q4
Q5
Q6
From RTD module
n Stator thermal overload
protection
49
n Restart inhibit
(rotor protection)
66, 49R
n Starting time supervision 48
n Earth-fault protection
50G
TD1
K 14
K 15 +
7UM62
IA(L1)S2
IB(L2)S2
IC(L3)S2
Port C or D
(non-directional,
directional)
64G
67G
n Differential protection
87M
n Overcurrent time
protection
50, 51
n Negative sequence
protection
46
n Undervoltage protection
27
n Undercurrent protection
37
n Active power protection
32U
n Frequency protection
81
n Breaker failure protection 50BF
7
Siemens AG
Power Transmission
and Distribution
Power Automation Division
P.O. Box 48 06
90026 Nuremberg
Germany
www.siprotec.com
Editor and Layout:
Dept. Marketing Services
Power Automation Division