Medium-voltage instrument transformers
Low voltage current instrument transformers
CLT 20
The CLT 20 current instrument transformer are used for metering and protection purposes in LV indoor switching stations with the highest system voltage of 0.72 kV. Their rated secondary currents are 5A or 1A.
The ultimate operating current of the CLT 20 is 100 % IN, but if agreed with the manufacturer also other values may be delivered, such as 120 % IN. Active parts of the CLT 20 are placed in boxes made of high-quality plastic material. The insulation materials used meet the requirements on thermal insulation class E.
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Parameters
- Highest voltage for equipment: 0.72 kV
- Power frequency test voltage: 3 kV
- Nominal primary current: 5 A or 1 A
- Nominal secondary current: 60 x In (max. 50 kA)
- Rated short-time thermal current, Ith: 2,5 x Ith
- Rated dynamic current, ldyn: 1,0 x In (1,2x In)
- Nominal frequency: 50 Hz (60 Hz)
- Thermal insulation class: E
- Operation conditions: corresponds to the -5/40 thermal class to ČSN EN 61869-1 standard; for mounting in indoor areas without water condensation
- Standard: ČSN EN 61869-1, ČSN EN 61869-2, IEC EN 61869-1, IEC EN 61869-2, GOST 15 150
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