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Production and servicing of mine equipment


Čeština (Česká republika)English (United Kingdom)

IT3Sb-Q transformer stationtrafo

The IT3Sb-Q transformer station is designed to transform 6000 V/500 V voltage in a three-phase IT system with a frequency of 50/60 Hz. It is indented for the use in underground mines, in atmosphere with methane explosion hazard.

All its components are closed in a flame-proof enclosure tested according to the valid ATEX standards.

The power electrical part consists of a lockable disconnector with removable key, surge arrestors, and a compact power circuit-breaker with an integrated electronic release device. This release device protects the transformer leads against overcurrent, short circuit and current asymmetry. The other safety components include an intrinsically safe circuit and an insulation monitoring device to measure the insulation before and constantly after the circuit-breaker is switched on.

The transformer station operation is controlled using a PLC. The operating values, value of insulation condition of the monitored network and status information are clearly shown on the LCD display that is installed underneath the visor in the LV chamber.

The transformer station can be controlled both locally and remotely. Data transmission can be ensured via Modbus protocol, using Ethernet interface or HDSL. Based on the remote surveillance, the operator is able to fully monitor and control the station. The software to control the station has been developed for PROMOTIC system environment with an implemented database of individual stations archives and a database of operators.

Technical specification

Basic technical parameters
IT3Sb-Q3 IT3Sb-Q4 IT3Sb-Q6
Nominal output
315kVA 400kVA 630kVA
Nominal primary voltage
6000V(alternatively from 2,500V up to 6,600V) 
Highest operating voltage
Nominal secondary voltage 2x500V(alternatively 2x400V up to 2x1,050V  
Voltage system
Isolated network IT, 3x6,000V, 50/60Hz
Nominal current I total
365A 460A 720A
Weight 3,500kg 4,500kg
Dimensions 2,500x1,300x800mm

Documentation and technical data sheet

Click to open or download the requested file.

pdfIT3Sb-Q english.pdf869.14 KB
pdfIT3Sb-Q_polish.pdf868.77 KB
pdfIT3Sb-Q_russian.pdf872.13 KB
pdfIT3Sb-Q_turkish.pdf917.73 KB
pdfIT3Sb-Q4-E-11-01_Schematic diagram of the transformer station_RK-3.pdf68.62 KB
pdfIT3SB-Q6-E-12-01_Schematic diagram.pdf67.1 KB