RM-20 / RMt-20 — medium-voltage switchgear up to 24 kV for transformer substations
RM-20 and RMt-20 are indoor medium-voltage switchgear up to 24 kV for transformer substations in industrial and general power engineering. They are installed in separate electrical rooms against a wall or, once the rear side is closed, free-standing. Enclosures and doors are made of sheet steel with anticorrosion powder coating.
- Rated voltage
- 6.3 / 17.5 / 24 kV
- Insulation to earth/between poles
- 125 / 50 kV
- Across the isolating distance
- 145 / 60 kV
- Busbar current
- RMt-20: 350 A; RM-20: 630 A
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The RMt-20 has a single insulated busbar system of round copper rods that connect the individual apparatus. The cubicles are small, with a standard width of 690 mm and depth of 850 mm, so the switchgear suits prefabricated substations for 7.2, 12, 17.5 and 24 kV. An RMt-20 can have up to 4 cubicles with OR4 24 TU2, OR5 24 T2-A or OM-24/T/UD/160 and OMB-24/T/BD/160 load-break switches, surge arresters and transformers according to the customer's configuration. Busbar current is 350 A, protection degree IP10.
The RM-20 has an upper busbar system on insulators, a basic cubicle width of 850 mm and an unlimited number of cubicles. The line cubicle is fitted with rear-mounted load-break switches OM-24/T/UD/160 or OR4 24 TU2, and the transformer cubicle with OMB-24/T/BD/160 or OR5 24 T2A. OM-24/UD/160, OR4 24 PU2 and OR5 24 P2-A switches and the NRK indirect drive are also used. At the customer's request, MV apparatus from other manufacturers is installed. In the RM-20 the busbar current is 630 A and the protection degree is IP30.
Both types offer line, measurement, transformer and bus-section cubicles, and the RM-20 also has a surge arrester cubicle. Rated voltages are 6.3, 17.5 and 24 kV, the insulation level to earth and between poles is 125/50 kV, and across the safe isolating distance 145/60 kV. Line cubicle current is 400 A (up to 630 A in the RM-20), transformer cubicle current 120 A. Short-time withstand current is 16 kA for the RMt-20 and 12.5 kA for the RM-20 for 1 s, peak current 40/31 kA, frequency 50 Hz. Cubicle heights are 2,000 (2,250) mm and 2,200 mm.
The switchgear was tested at the Institute of Power Engineering in Warsaw as part of the STKB 20/630 substation (approval No. 475) and complies with PN-EN 60298. Declarations of conformity and a voltage test report are supplied with the delivery. RM-20 and RMt-20 cubicles are installed, among others, in concrete substations, where the MV switchgear occupies a separate compartment next to the transformer and LV switchgear compartments.
Technical specifications
| Rated voltage | 6.3 / 17.5 / 24 kV |
|---|---|
| Insulation to earth/between poles | 125 / 50 kV |
| Across the isolating distance | 145 / 60 kV |
| Busbar current | RMt-20: 350 A; RM-20: 630 A |
| Line cubicle current | 400 A (RM-20 — up to 630 A) |
| Transformer cubicle current | 120 A |
| Current for 1 s | RMt-20: 16 kA; RM-20: 12.5 kA |
| Peak current | 40 / 31 kA |
| Protection degree | RMt-20: IP10; RM-20: IP30 |
| Cubicle width | 690 mm / 850 mm |
| Standards | PN-EN 60298; tested as part of STKB 20/630 (approval 475) |
Request a price and lead time
RM-20 / RMt-20 — medium-voltage switchgear up to 24 kV for transformer substations. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What voltages are RM-20 and RMt-20 designed for?
Rated voltages are 6.3, 17.5 and 24 kV, and the RMt-20 is used in prefabricated substations for 7.2, 12, 17.5 and 24 kV. The insulation level to earth is 125/50 kV, across the isolating distance 145/60 kV.
How does the RMt-20 differ from the RM-20?
The RMt-20 has insulated copper rod busbars, a 690 mm cubicle, up to 4 cubicles and a busbar current of 350 A. The RM-20 has busbars on insulators, an 850 mm cubicle, an unlimited number of cubicles and a busbar current of 630 A.
What tests has the switchgear passed?
It was tested at the Institute of Power Engineering in Warsaw as part of the STKB 20/630 substation, approval No. 475. The switchgear complies with PN-EN 60298, and a voltage test report is supplied with the delivery.
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