Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
Technical Data page 4
Technical data
System interface (cont'd)
Transmission rate Up to 19200 baud
Bridgeable distance Max. 1 km/3300 ft
Fiber optic
Connection fiber-optic cable ST connector transmitter/receiver
Terminal At the bottom part of the housing,
mounting location “B”
Optical wavelength λ = 820 nm
Permissible path attenuation Max. 8 dB, for glass fiber 62.5/125 µm
Bridgeable distance Max. 1.5 km/0.9 miles
Functions
Definite-time overcurrent protection (ANSI 50, 50N, 67N)
Operating modes 3-phase (standard) or 2-phase
A (L1) and C (L3)
Number of elements (stages) 50-1, 50-2, 50-3 (I>, I>>, I>>>)
(phases)
50N-1, 50N-2, 50N-3 (I
E
>, I
E
>>,
I
E
>>>) (ground)
Setup setting ranges
Pickup current
50-1, 50-2, 50-3 (phases)
Pickup current
50N-1, 50N-2, 50N-3 (ground)
0.5 to 175 A or ∞
1)
(in steps of 0.01 A)
0.2 to 175 A or ∞
1)
(in steps of 0.01 A)
Delay times T 0to60sor∞ (in steps of 0.01 s)
Dropout delay time 50/50N
T
DROPOUT (DO)
0to60s(instepsof0.01s)
Times
Pickup times (without inrush
restraint, with inrush restraint
+10ms)
With twice the setting value
With ten times the setting value
Dropout time
Approx. 30 ms
Approx. 20 ms
Approx. 30 ms
Dropout ratio Approx. 0.95 for I/I
nom
W 0.3
Tolerances
Pickup
Delay times T, T
DO
3%ofsettingvalueor75mA
1)
1%or10ms
Inverse-time overcurrent protection (ANSI 51, 51N, 67N)
Operating mode 3-phase (standard) or
2-phase A (L1) and C (L3)
Setting ranges
Pickup currents 51 (phases)/(I
P
)
Pickup currents 51N (ground)/(I
Ep
)
Time multiplier T for 51, 51N
(I
P
, I
Ep
) (IEC characteristics)
Time multiplier D for 51, 51N
(ANSI characteristics)
Trip characteristics
IEC
acc. to IEC 60255-3 or BS 142
ANSI/IEEE
Voltage-independent
Voltage-controlled
Voltage-dependent
0.5to20A
1)
(in steps of 0.01 A)
0.2to20A
1)
(in steps of 0.01 A)
0.05 to 3.2 s or ∞ (in steps of 0.01 s)
0.05 to 15 s or ∞ (in steps of 0.01 s)
Inverse (type A), very inverse (type B),
extremely inverse (type C),
long inverse (type B)
Inverse, short inverse, long inverse,
moderately inverse, very inverse,
extremely inverse, definite inverse
Dropout characteristics with
disk emulation
IEC
acc. to IEC 60255-3 or BS 142
ANSI/IEEE
Inverse (type A), very inverse (type B),
extremely inverse (type C),
long inverse (type B)
Inverse, short inverse, long inverse,
moderately inverse, very inverse,
extremely inverse, definite inverse
Pickup threshold IEC and ANSI Approx. 1.1 · I
p
Dropout setting IEC and ANSI
Without disk emulation
With disk emulation
Approx. 1.05 · I
p
setting value for
I
p
/I
nom
W 0.3, corresponds to approx.
0.95 · pickup value
Approx. 0.9 · I
p
setting value
Tolerances
Pickup/dropout thresholds I
p
, I
Ep
Trip time for 2 w I/I
p
w 20
Dropout time for I/I
p
w 0.9
3%ofsettingvalueor75mA
1)
5 % of reference (calculated) value
+ 2 % current tolerance or 30 ms
5 % of reference (calculated) value
+ 2 % current tolerance or 30 ms
Determination of direction for ground faults
Polarization/type With zero-sequence quantities
3V
0
,3I
0
or
with negative-sequence quantities
3V
2
,3I
2
Forward range
Rotation of reference voltage V
ref,rot
V
ref,rot
± 86 °
–180 ° to 180 ° (in steps of 1 °)
Directional sensitivity
Zero-sequence quantities 3V
0
,3I
0
Negative-sequence quantities
3V
2
,3I
2
V
N
≈ 2.5 V displacement voltage,
measured
3V
0
≈ 5 V displacement voltage,
calculated
3V
2
≈ 5 V negative-sequence voltage
3I
2
≈ 225 mA negative-sequence
current
1)
Times
Pickup times (without inrush
restraint; with inrush restraint
+ 10 ms) 50-1, 50-2, 50N-1, 50N-2
With twice the setting value
With ten times the setting value
Dropout time 50-1, 50-2, 50N-1, 50N-2
Approx. 45 ms
Approx. 40 ms
Approx. 40 ms
Tolerances
Angle faults for phase and earth
faults
±3°electrical
Inrush restraint
Controlled functions Time-overcurrent elements, I>, I
E
>,
I
p
, I
Ep
(directional, non-directional)
50-1, 50N-1, 51, 51N, 67N-1
Lower function limit At least one phase current
(50 Hz and 100 Hz) W 125 mA for
I
nom
=5A,W 50 mA for I
nom
=1A
Upper function limit (setting range) 0.3 to 25 A
1)
(in steps of 0.01 A)
Setting range, stabilization factor I
2f
/I 10 to 45 % (in steps of 1 %)
Crossblock I
A(L1)
, I
B(L2)
, I
C(L3)
ON/OFF
1) At I
nom
= 1 A, all limits divided by 5.