Back to COSI-CT product page COSI-CT Specifications

Column mechanical & electrical ratings
COSI-CT Type   72.5 123 145 245 362 420 550 800
Maximum system
Voltage (Um)
kV 72.5 121 145 245 362 420 550 800
Impulse test voltage (BIL) kV 350 550 650 1050 1300 1550 1800 2100
Minimum creepage
distance
in 57 115 115 193 285 562 562 562
mm 1400 2900 2900 4900 7240 14280 14280 14280
Height in 54.7 54.7 77.91 107.44 127.13 204.71 204.71 204.71
mm 1389.4 1389.4 1978.9 2729 3229.1 5199.6 5199.6 5199.6
Weight lbs 75 88 88 111 124 177 177 177
kg 34 40 40 50 56 80 80 80
Static Withstand lbs 675 675 675 900 900 Suspension application only
N 3000 3000 3000 4000 4000 Suspension application only
Ratings and dimensions for IEC pollution Class 2. Other ratings are available.
Environmental
Operating Temperature Range -40 °C to 55 °C (-40 °F to 131 °F) Outdoor Service Conditions
Opto-Electronic Module -5 °C to 40 °C (23 °F to 104 °F) Indoor Service Conditions
Seismic Capability 0.5 g
Mechanical
Standard Pollution Withstand IEC Level II, other ratings available
Insulation Solid composite insulator
Electronics Dimensions 19’’ x 18’’ x 8.75’’ (482 mm x 457 mm x 222 mm)
(includes high energy metering interface)
Electronics
Packaged in 2 modules:


Sensor Electronics












Current Amplifier/Power Supply
Low Energy Analog Interfaces1 4 Vrms metering
200 mVrms protection
Dynamic Range < 0.2% error at rated current for 4 V output,
< 0.5% error at rated current for 200 mV output
< 2% error at 108 kApeak
(using protection sensor)
Bandwidth 0.5 Hz to 6 kHz DC available
High Energy Analog Interfaces1 1 Arms [2 ohm burden] or 5 Arms [B0.1 (2.5 VA) burden] nominal at power 0.9 for metering
Dynamic Range < 0.2% error from 1 A to 4000 A
(using extended metering range sensor)
Bandwidth 10 Hz to 6 kHz for 1 A metering output
Input Power Requirements 70 Vdc to 150 Vdc
Typical power 60 W
Electronic Turns Ratio User selectable
Alarms Contacts Data invalid / Maintenance required
1 Scales linearly with primary voltage and current.
Electrical Performance
Type I3: Metering Accuracy IEC Class 0.2S, IEEE Class 0.3, 0.15S
Protection Accuracy IEC Class 5P, IEEE 10%
Type II3: Extended Range Std Metering Accuracy 0.2% (0.2% to 150% of rated current)2
Type III3: Extended Range High Metering Accuracy 0.15% (0.2% to 150% of rated current)2
Continuous Current 4800 A Max (4800 A, RF = 1; or 3000 A, RF = 1.33; or 2500 RF = 1.5)
Rated Current User specified for up to 4000 A
Short-time Thermal Current 63 kArms for 1 s
2 Accuracy window moves with selected ratio. / 3 Other ratings available, consult Alstom Grid.