The TSHL-0.66-III (ТШЛ-0,66-III) is a bus-type current transformer manufactured by Sverdlovsk Current Transformer Plant (SZTT OJSC), a specialist in measuring transformers headquartered in Yekaterinburg with a production history dating back to 1941. Designed for AC electrical circuits operating at up to 0.66 kV and frequencies of 50 or 60 Hz, these transformers transmit measurement signals to metering instruments, protection relays, automation systems, and control equipment in low-voltage distribution installations.
The series is produced in three mechanical versions — -1 (0.8 kg), -2 (2 kg), and -3 (3 kg) — covering nominal primary currents from 100 to 4,000 A. Secondary output is available at 1 A or 5 A, and secondary burden ranges from 1 to 30 VA.
Accuracy classes 0.2, 0.5, 0.2S, and 0.5S serve revenue metering; class 1.0 addresses general measurement schemes; and classes 5P and 10P are intended for protective relay applications.
The units are also qualified for use at voltages above 0.66 kV when the bus or cable insulation independently provides primary-to-secondary isolation. All versions are available in climatic variants У3, Т3, У2, Т2, and УХЛ2.1, accommodating temperate, tropical, and cold-climate conditions, and may be mounted in any orientation.
The calibration interval is 8 years, and the product is certified under ТУ16-2011 ОГГ.671 230.001.
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