TAVRIDA ELECTRIC ISM15_LD_1 Series, Application Manual

Page: 58 / 70

58
Indoor Switching Modules (ISM) - Additional Standards
Type C37.60
C37.74
(With Exceptions)
Applies to Breaker Types ISM25_LD_1, ISM25_LD_3
Rated Data
Rated voltage (Ur) 27 kV
Rated current (Ir) to 800 A to 630 A
Rated power frequency withstand voltage (Ud) 60kV
Rated lightning impulse withstand voltage (peak) (Up) 125 kV
Rated short-circuit breaking current (Isc) to 12.5 kA
6)
Rated peak withstand current (Ip) to 32.5 kA
Rated short-time withstand current (Ik) to 12.5 kA
Rated fault-making N/A
to 12.5kA
[Max x2 sequential
without load
interruption]
Rated duration of short circuit (tk)
4 s
Rated frequency (fr) 50 / 60 Hz
Switching
Performance
Mechanical life
5)
(CO-cycles)
30000
Operating cycles
5)
, rated current (CO-cycles) 30000
Maximum number of CO-cycles per hour refer to CM
Operating cycles
5)
, rated–short circuit breaking current
100
Closing time
3)
, with CM_1501_01 - not more than
35 ms
Opening time
3)
, with CM_1501_01 - not more than 15 ms
Break time
3)
, with CM_1501_01 - not more than 23 ms
Rated operating sequence (CM_1501_01)
O-0.3s-CO-10s-CO-
10s-CO-10s
O-0.3s-CO-10s-CO
Note
2) ISM15_LD_2(55) available with
150.000 CO cycles
3) Excluding CM processor acceptance time. See CM technical specifications
or contact Tavrida NA for detailed operation timing.
4) 10 A current is permissible
for 5 minutes
5) See Figure 58 / page 61
6) At 40% d. c. component
Explanatory notes - C37.60
The ISM25_LD series have been tested to ANSI C37.60 in a minimal enclosure through full testing of the OSM25_Al_1
and OSM25_Al_2 recloser series. Test reports and further information can be obtained from Tavrida applications
engineers.
Explanatory notes - C37.74
The ISM25_LD series have been tested to and passed elements of C37.74.
It should be carefully noted however
that
the type of vacuum interrupter used in this series is designed for breaking current, whereby the interrupter contacts
rejuvenate during the load breaking process. Make events followed by mechanical “cold” opening, such as the x3
fault-making tests prescribed under ANSI C37.74, will potentially cause welding of the contacts and inability to open
the breaker. Consult Tavrida applications engineers if the system design may subject the breaker to make events of
this type.
Warning!
9