Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
Technical Data page 6
Technical data
Negative-sequence protection (ANSI 46)
Definite-time characteristic (ANSI 46-1 and 46-2)
Setting ranges
Unbalanced load tripping element
46-1, 46-2 (I
2
>, I
2
>>)
Delay times 46-1, 46-2 (T
I2
>, T
I2
>>)
Dropout delay times 46 T
Dropout
0.5to15Aor∞ (disabled)
1)
(in steps of 0.01 A)
0to60sor∞ (disabled)
1)
(in steps of 0.01 s)
0to60s(instepsof0.01s)
Functional limit All phase currents w 50 A
1)
Times
Pickup times
Dropout times
Dropout ratio
Characteristic
46-1, 46-2/I
2
>, I
2
>>
Approx. 35 ms
Approx. 35 ms
Approx. 0.95 for I
2
/I
nom
W 0.3
Tolerances
Pickup values
46-1, 46-2/I
2
>, I
2
>>
Delay times
3%ofthesetvalueor75mA
1)
1%or10ms
Inverse-time characteristic (ANSI 46-TOC)
Setting ranges
Pickup value 46-TOC/I
2p
Time multiplier T
I2p
(IEC)
Time multiplier D
I2p
(ANSI)
0.5to10A
1)
(in steps of 0.01 A)
0.05 to 3.2 s or ∞ (disabled)
(in steps of 0.01 s)
0.5to15sor∞ (disabled)
(in steps of 0.01 s)
Functional limit All phase currents w 50 A
1)
Trip characteristics acc. to
IEC
ANSI
Inverse, very inverse,
extremely inverse
Inverse, moderately inverse,
very inverse, extremely inverse
Pickup threshold IEC and ANSI Approx. 1.10 · I
2p
Tolerances
Pickup threshold I
2p
Time for 2 w I/I
2p
w 20
3 % of the setting value or 75 mA
1)
5 % of reference (calculated) value
+ 2 % current tolerance or 30 ms
Dropout characteristic with disk
emulation acc. to ANSI
Inverse, moderately inverse,
very inverse, extremely inverse
Dropout value
IEC and ANSI without disk
emulation
ANSI with disk emulation
Approx. 1.05 · I
2p
setting value,
corresponds to approx. 0.95 · pickup
Approx. 0.90 · I
2p
setting value
Tolerances
Dropout value I
2p
Time for 2 w I
2
/I
2p
w 0.90
3%ofthesetvalueor50mA
1)
5 % of reference (calculated)
value +2 % current tolerance, or 30 ms
Frequency protection (ANSI 81O/U)
Number of frequency elements 4, each can be set to f >orf<
Setting ranges
Pickup values f >orf<for
f
nom
=50Hz
Pickup values f >orf<
for f
nom
=60Hz
40 to 60 Hz (in steps of 0.01 Hz)
50 to 70 Hz (in steps of 0.01 Hz)
Delay times T
Undervoltage blocking, with
positive-sequence voltage V
1
0 to 100 s or ∞ (disabled)
(in steps of 0.01 s)
10 to 150 V (in steps of 1 V)
Times
Pickup times f >, f<
Dropout times f >, f<
Approx. 80 ms
Approx. 80 ms
Dropout difference
Δ f = |pickup value – dropout value| 0.02 to 1 Hz
Dropout
Ratio undervoltage blocking Approx. 1.05
Tolerances
Pickup thresholds
Frequency 81O/U f >, f<
Undervoltage blocking
Delay times
15 mHz (with V = V
nom
, f = f
nom
)
3 % of setting value or 1 V
1 % of the setting value or 10 ms
Starting time monitoring for motors (ANSI 48)
Setting ranges
Startup current of the motor
I
STARTUP
Pickup threshold I
MOTOR START
Permissible startup time
T
max. STARTUP
Maximum startup time with
warm motor T
max. STARTUP W
Maximum startup time with
cold motor
Permissible locked rotor time
T
LOCKED-ROTOR
2.5to80A
1)
(in steps of 0.01)
2to50A
1)
(in steps of 0.01)
1to180s(instepsof0.1s)
0.5to180sordisabled(instepsof0.1s)
0to80%ordisabled(instepsof1%)
0.5to180sordisabled(instepsof0.1s)
Tripping time characteristic
For I > I
MOTOR START
t
2
TRIP
STARTUP
max. STARTUP
=
⎛
⎝
⎜
⎞
⎠
⎟
⋅
I
I
rms
T
I
STARTUP
= Motor starting
current setting
I = Actual current
flowing
T
max. STARTUP
= Tripping time for
rated motor startup
current
I
MOTOR START
=Pickupthreshold
setting, used to
detect motor startup
t
TRIP
= Tripping time in
seconds
Dropout ratio I
MOTOR START
Approx. 0.95
Tolerances
Pickup threshold
Delay time
3%ofsettingvalueor75mA
1)
5%or30ms
Load jam protection for motors (ANSI 51M)
Setting ranges
Current threshold for
alarm and trip
Delay times
Blocking duration after
motor start
Tolerances
Pickup threshold
Delay time
2.5to60A
1)
(in steps 0.01 A)
0to600s(insteps0.01s)
0to600s(insteps0.01s)
3%ofsettingvalueor75mA
1)
1%or10ms
1) At I
nom
= 1 A, all limits divided by 5.