Switchgears for mining industry PREM-GJm series
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Purpose
Distribution of three - phase alternating current electrical energy with nominal frequency 50 Hz and nominal voltage up to 12 kV.
Application
- in MV networks for industrial factories as subdistribution switchgears,
- in hard environmental conditions (IP 54), especially in underground cable networks in coal and copper mines and in other branches of industry, where the level of dustiness, humidity, high temperature etc. is very high,
- in low mining pits, in underground mines in mining pits with high degree of explosion hazard, high degree of methane explosion hazard and the degree of coal dust explosion hazard is A,
- as a set of closing cubicles,
- for power supply for 6 kV motors, e.g. for conveyor belt motor,
- in retrofitted mining networks as a replacement for exploited switchgears type RSK-6.
General characteristics
- indoor, air insulated, draw-out switchgear,
- metal enclosure providing degree of enclosure protection
- IP 54 and mechanical strength degree IK 10,
- stationary, free-standing,
- internal arc resistant,
- internal decompression of arcing gases,
- compartments separated by metallic partitions (metal-clad),
- single busbar system,
- self-contained or external source of feeding auxiliary circuits,
- motor-drive mechanism of operating the switch disconector,
- available in various alternatives, depending on the equipment used in main and auxiliary circuits, provided with vacuum or SF6 insulated switching devices.
Features
- total safety for personnel even in case of violation of operation rules,
- total safety for personnel even in case of violation of operation rules,
- internal decompression increasing safety for operating personnel and equipment,
- operation reliability provided by suitable switching devices and modern digital protection units,
- possibility of cooperating with a digital system for visualization of operating and emergency conditions, remote surveillance and control of power equipment and systems,
- small overall dimensions and compact design of switchgear,
- minimum maintenance resulting in short work stoppage,
- professional service provided by the manufacturer,
- automatic access lock that prevents from malfunctioning during opening and closing the disconnector and earthing switch,
- access to earthing switch drive socket blocked by electromagnetic bolt from the voltage state on the cable,
- safe and comfortable operating due to mimic diagrams and indicators of the inside connectors position on elevation.
Front views and cross-sections cubicles of PREM-GJm switchgears
- busbars
- contact of the tulip joint
- disconnector with or without fuse
- switch-disconnector
- circuit breakerk
- contactor
- fuse
- voltage transformer or transformer
- fuse insert
- current transformer
- reactance insulator
- earth-fault transformer
- earthing contact
- foundation frame
- busbar bushing
Technical data
| Type of the switchgear | PREM-GJm | |
| Rated voltage | kV | 7,2 / 12 |
| Power frequency withstand voltage | kV | 20 / 28 |
| Lightning impulse withstand voltage | kV | 60 |
| Rated current: | ||
| normal short-time withstand current peak withstand current |
A kA/s kA |
up to 630 up to 16/1 up to 40 |
| Internal arc withstand current | kA/s | 16/0,15 |
| Rated frequency | Hz | 50 |
| Degree of protection | IP 54 | |
| Mechanical strength degree | IK 10 | |
| Dimensions of cubicles: | ||
| width [A] height [B] depth [C] |
mm mm mm |
650 1600 850 |
| Internal Arc Classification | AFLR | |
| Loss of Service Continuity Classification | LSC2A | |
| Compliance with standards | PN-EN 62271-200; PN-EN 62271; PN-EN 60529; PN-G-50003 | |
Exemplary schematic diagrams
Product card in pdf formatSwitchgears for mining industry PREM-GJm series plik .pdf
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