Tripping Characteristics - Siemens SIPROTEC 7SJ62 Handbuch
Multifunktionsschutz mit steuerung
Vorschau ausblenden
Andere Handbücher für SIPROTEC 7SJ62:
Inhaltsverzeichnis
Werbung
Verfügbare Sprachen
Verfügbare Sprachen
5
Tripping Characteristics
5.1
Tripping characteristic for three-pole load
Table 5-1
Tripping times for symmetric load in three poles from cold condition at an ambient temperature of 25 °C
Tripping class
Parameter
4203
TIME
CONSTANT
Class 2
1.0 min
Class 3
1.5 min
Class 5
2.5 min
Class 10a
4.5 min
Class 10
5.2 min
Class 20
9.7 min
Class 30
14.5 min
Class 40
19.3 min
Class 50
23.6 min
28
Figure 5-1 shows the tripping characteristics, table 5-1 depicts selected trip times for
three-pole symmetric load from cold condition for classes 2 to 50.
1.5
3
41.5
8.0
62.3
12.0
103.8
20.0
186.8
36.0
215.9
41.6
402.7
77.6
602.0
116.0
801.2
154.4
979.7
188.8
Deviations of the trip times are < 10 % from cold condition over the permitted
temperature range of –5 °C to +55 °C and considering all tolerances (permitted
according to VDE 0165: < 20 %).
Figure 5-2 shows the tripping characteristics for three-pole symmetric loading at 90 %
previous load for classes 2 to 50.
The formula behind the tripping characteristics is as follows:
2
I
------------ -
–
k I
⋅
t
N
-- -
=
ln
------------------------------------------------ -
τ
⋅
th
s
I
------------ -
k I
⋅
N
According to VDE 0165, a tripping characteristic must be chosen such that the trip time
for three-pole loading, which can be derived from the curve for the ratio I
of the machine under protection, does not exceed the locked-rotor time t
the type plate.
The characteristic for starting without previous load applies.
This includes the most unfavourable case of a short operational break during which
the motor virtually does not cool down.
Trip time in seconds at
4
5
-times the value of the setting current
4.4
2.8
6.6
4.1
10.9
6.9
19.7
12.4
22.7
14.3
42.4
26.8
63.3
40.0
84.3
53.3
103.1
65.1
I
2
pre
------------ -
k I
⋅
τ
N
th
--------- - 60
=
ln
⋅
⋅
min
2
–
1
6
7.2
1.9
1.3
2.9
2.0
4.8
3.3
8.6
5.9
9.9
6.8
18.5
12.8
27.6
19.1
36.7
25.4
44.9
31.0
2
2
1
I
1
---------- -
---- -
---------- -
–
⋅
1.06
1.06
I
N
---------------------------------------------------------------------------------------------
2
1
I
---------- -
---- -
⋅
1.06
I
N
7SJ62/63/64 Additional Information
C53000-B1174-C170-1
8
1.1
1.6
2.7
4.8
5.5
10.3
15.4
20.5
25.1
I
2
2
pre
---------
⋅
I
N
2
1
–
/I
Start
Nominal
indicated on
E
Quicklinks ausblenden:
Werbung
Kapitel
Inhaltsverzeichnis
