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APPLICATION AREA
ZTSN-... transformer units of normal design are suitable for local protection and for supplying lighting circuits and other loads with voltages of 133V, 230V or 400V. These devices are designed for operation with connection to three-phase electric power networks with insulated neutral point of the supply transformer, with the rated voltage of 500 V and furnished with central protection against leakages.
APPLICATION CONDITIONS
The device is suitable for working areas of underground operations without the hazard of methane explosion and the ones with the ‘a’ degree of methane explosion hazard as well as with the ‘A’ class of coal dust explosion hazard.
CONFORMITY WITH STANDARDS
ZTSN-... transformer units of normal design are manufactured in line with rules of good engineering practice in the field of occupational safety as well as current state-of-art in technical expertise with consideration to applicable technical standards and the 2014/35/UE Low Voltage Directive.
TECHNICAL PARAMETERS
| Power supply voltage: |
3x500VAC |
| Output voltage: |
3x133VAC or 3x230VAC or 3x400VAC |
| Number of outlets: | 1 – 10 |
| Type of electric network: | IT |
| Index of protection: | IP54 |
| Resistance threshold for tripping of the central leakage protection |
15kohm +- 20% @ 400V 7kohm +- 20% @ 230V 7kohm +- 20% @ 133V |
| Resistance threshold for tripping and reclosure of the interlocking leakage protection |
Rtrip: 25kohm +- 20% @ 400V Rtrip: 15kohm +- 20% @ 230V Rtrip: 15kohm +- 20% @ 133V Rtrip: <1,5Rtrip |
| Monitoring of the safety (earthing) circuit continuity for the output (secondary side) network |
Rtrip: 80ohm +- 20% Rtrip: 60ohm +- 20% |