As a device to support the uninterrupted operation of electrical equipment of up to 0.69 kV of process facilities in case of main types of power failures, allowing for predicting and early detection of such failures.
Non-stop operation of electrical equipment of process facilities in case of main types of power failure
Prevention of synchronous motors from out-of-step falling, falling out of magnetic starters and contactors of low-voltage electrical loads
Synchronous switching of a faulty bus bar section to a standby input without overcurrents
Improvement of conditions for self-starting of electric motors after restoration of power supply to loads
Oscillography of transient processes of violation and recovery of power supply normal parameters of sections
Structurally, the QALT system consists of a power section and a control unit. The power switching and measuring part of the QALT is designed for:
measuring the electrical parameters of bus sections;
switching the power supply of a faulty bus section to the standby section in two-section power supply grids with two 0.4 kV inputs;
protection of the switchgear bus bars from overload and short circuits.
Switching is made by disconnecting the input switch of a faulty bus section, followed by switching on a thyristor switch. The command to switch over the power supply is sent by the quick ALT control system – SUBA-NT. The quick ALT control
system (SUBA-NT) is a monoblock unit with the controls and indication elements on its front panel. SUBA-NT is powered from two independent 24 V DC inputs, or from a guaranteed 24 V DC power source. SUBA-NT also provides:
warning and parameter monitoring;
oscillography of transient processes;
transfer of information to the upper level over Modbus RTU;
self-diagnostics of the device.
Guaranteed uninterrupted power supply and high reliability of the system due to: the shortest time for spotting an emergency bus section and high-speed response; the ability to predict the main types of power failures and their early
Optimized control and monitoring due to a single smart control system