Current transformer type CTG
ring type current transformer, encapsulated in epoxy resin • highest permissible system up to 36 kV • rated primary currents up to 3 kA
Current transformers of CTG type are designed
for indoor use at medium voltages for current
up to 15 000 A.
The typical areas of application are heavy current
busducts. The current conductor of busduct
or switchgear is the primary winding of a current
transformer.
The main electrical insulation is obtained
by means of a suitable air gap.
CTB current transformers have up to 5 cores for
measuring and/or protection.
Dane techniczne:
| highest permissible system voltage | 0.72/7.2/12/17.5/24/36 kV |
| power frequency withstand voltage, 1 min | 3/20/28/38/50/70 kV |
| impulse withstand voltage 1.2/50 µs | 60/75/95/125/170 kV |
| rated frequency | 50 or 60 Hz |
| rated primary current IPn | 500 – 30 000 A |
| rated short–time thermal current Ith1s | 100 x Ipn (r.m.s. value) |
| rated dynamic current Idyn | 2.5 x Ith1s (peak value) |
| number of cores | up to 5 |
| rated secondary currents ISn | 1 A or 5 A or fractional |
| rated outputs Sn | 5 – 100 VA |
| accuracy classes | 0.2, 0.2S, 0.5, 0.5S, 5P, 5PR, 10P, 10PR, PX |
| instrument security factor (FS) | 5, 10, 15 |
| accuracy limit factor | 10, 20, 50 |
| ambient temperature | –5 ÷ 90oC |
| according to standards | PN-EN 61869-2:2012 |