OSM-15.5 and OSM-27 Series

OSM-15.5 and OSM-27 Series
The tavrida OSM utilizes the reliability of the ISM-LD series for outdoor circuit breaker applications. Weighing less than 154lbs, the OSM is bundled with a number of features in a very compact enclosure. Non-saturable Rogowski coils in each pole guarantee high accuracy current measurement for all three phases and residual current. Voltage measurement is achieved through six capacitive voltage sensors built into the bushings. The bushings themselves are covered by silicone rubber , with the entire package encased in an aluminium dead tank, Capable of more than 30,000 close – open operations at full load or 200 short circuit events, the OSM has been proven in emerging markets where many installations trip daily due to aging infrastructure. Coupled with the advanced Tavrida RC05E recloser control, the OSM is the most reliable, maintenance free recloser on the market.
Basic Operating ParametersOSM/TEL 15.5-16/630.204OSM/TEL 27-12.5/630.205
Rated voltage (Ur)15.5 kV27 kV
Rated power frequency withstand voltage (Ud), 1 min dry50 kV60 kV
Rated power frequency withstand voltage, 10 s wet45 kV50 kV
Rated Lightning impulse withstand voltage (peak) (Up)110 kV125 kV (150kV on request)
Rated current (Ir)630 A630 A
Cable charging current31.5 A31.5 A
Line charging current10 A10 A
Rated short-circuit breaking current (lsc)16 kA12.5kA
Rated peak withstand current (Ip)40 kA31.5kA
Rated short-time withstand current (Ik)16 kA12.5 kA
Rated duration of short ciruit (tk)4 s4s
Rated frequency (fr)50/ 60Hz50/ 60Hz
StandardsOSM/TEL 15.5-16/630.204OSM/TEL 27-12.5/630.205
StandardsIEC 62271-100
IEC 62271-200
IEC C37.60-2003
IEC 62271-100
IEC 62271-200
IEC C37.60-2003
Switching performanceOSM/TEL 15.5-16/630.204OSM/TEL 27-12.5/630.205
Mechanical Life (CO-cycles)30,00030,000
Operating cycles, rated current (CO-cyles)30,00030,000
Operating cycles, rated-short circuit breaking current (0-operations)200200
Closing time, not more than77 ms77 ms
Opening time, not more than32 ms32 ms
Rated operating sequence0-0.1s-C0-1s-C0-1s-CO0-0.1s-C0-1s-C0-1s-CO
Other dataOSM/TEL 15.5-16/630.204OSM/TEL 27-12.5/630.205
Resistance of main circuit< 85 µOhm< 95 µOhm
Altitude3000 m (above 1000m derating
according to ANSI C37 .60)
3000 m (above 1000m derating
according to ANSI C37 .60)
Humidity100%, condensing100%, condensing
Solar radiation≤ 1.1 kW/m2≤ 1.1 kW/m2
Temperature range-40°C to +55°C-40°C to +55°C
Type of driving mechanismMonostable magnetic actuatorMonostable magnetic actuator
Pollution LevelVery heavy (as defined in IEC 60815)Very heavy (as defined in IEC 60815)

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Power Consultants Pty Limited, Locked Bag 2190, Suite 8, 79-83 Longueville Road, Lane Cove, NSW 2066