Three-phase servo-driven voltage stabilizer SRV33, 100–150 kVA

Description

The senior models of the three-phase SRV33 series, rated 100, 120 and 150 kVA, are designed to supply workshops, production lines, warehouses with refrigeration equipment, agricultural enterprises and infrastructure facilities connected to weak or overloaded 0.4 kV networks. As with the smaller models, the stabilizer regulates each phase separately, so phase imbalance, which is unavoidable with mixed loads, does not disturb operation. It accepts 285–440 V and delivers 400 V, or 380 or 415 V on request. The core is a regulating autotransformer with a current collector, which is moved by a servo drive controlled by a microprocessor. The correction speed is 90 V/s; the stabilizer adds no harmonics, and the output sine wave remains the same as in the mains. The overload capacity is 200 % for 10 seconds, which is enough for direct-on-line starting of motors and compressors. Efficiency is above 96 %. Protection monitors the minimum and maximum voltage and the maximum current, and a circuit breaker is installed at the input. The display shows voltages, current, frequency and power; the manual bypass allows the stabilizer to be taken out of service without disconnecting consumers. The cabinet is IP20, IP21 or IP54 on request. The permissible ambient temperature is up to 50 °C, altitude up to 2000 m, noise below 50 dB, and cooling is natural with a thermostat. The equipment is marked CE, and the manufacturer's quality management system is certified to ISO 9001 (TÜV Austria Hellas). Warranty is 2 years, spare parts 10 years. If higher power or faster response is needed, static stabilizers up to 2000 kVA are chosen. Before selection, it is recommended to measure the mains voltage for several days and to assess the starting currents of the largest motors at the site. Stabilizers of this power are usually installed in an electrical switchroom next to the main switchboard, with cable entries from below.

Technical specifications