Features and application
RMt-20 switchgear structure is made of sheet steel with powder coating which makes it corrosion resistant.
The standard bay width is 690 mm. The busbar system is insulated, round copper bars, bridging the different apparatuses. RM and RMt indoor switchgears are designed for power distribution at the rated voltage of up to 24 kV in industrial transformer stations. They can be installed in separate electrical rooms as wall-mounted and free-standing units.
RMt is a switchgear with a single insulated busbar system, designed for the distribution, measurement, and supply of electricity to power and industrial equipment. Small-size cubicles make the switchgear suitable for applications in prefabricated stations with rated voltages of: 7.2 kV, 12 kV, 17.5 kV, 24 kV.
Specification
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Switchgear type |
RMt-20 |
RM-20 |
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Rated voltage |
6,3 kV; 17,5 kV; 24 kV |
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Rated insulation voltage |
insulation to earth and between phases |
125 kV / 50 kV |
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across the isolating distance |
145 kV / 60 kV |
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Rated continuous current |
busbars |
350 A |
630 A |
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feeder bay |
400 A |
400 A (630 A) |
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transformer bay |
120 A |
120 A |
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Rated current (1 s) of busbars |
16 kA |
12,5 kA |
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Rated peak current |
40 kA |
31 kA |
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Frequency |
50 Hz |
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Protection degree |
IP 10 |
IP 30 |
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Bay width |
690 mm |
850 mm |
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Bay depth |
850 mm |
1000 mm |
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Bay height |
2000 mm (2250 mm) |
2200 mm |
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Switchgear arrangement: wall-mounted (free-standing) |
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Options
RMt-20 switchgear can have up to four 690 mm bays equipped with OR4 24 TU2, OR5 24 T2-A or OM-24/T/UD/160; OMB-24/T/BD/160 disconnectors, lighting arresters and converters arranged according to the client’s request. The busbar system is insulated, round copper bars, bridging the different disconnectors.
- feeder bay
- measurement bay
- transformer bay
- coupler bay
Certificates and authorisations
RMt-20 switchgear was tested as part of the testing of STKB 20/630 station at the Institute of Power Engineering in Warsaw – certificate no. 475. Meets the requirements of the PN-EN 60298:2000 standard.
- IEC 1330 – High-voltage/low-voltage prefabricated substations IEC 298 Amendment 1 – A.C. metal- enclosed switchgear and controlgear for rated voltages above 1 kV and up including 52 kV
- PN-86/E-05155 [IEC 694] – Power devices. High-voltage switchgear and controlgear. Common tests and requirements.
- PN-92/E-08106 [IEC 529] – Degrees of protection provided by enclosures (IP code).
The switchgear is delivered with a certificate of manufacture, including:
- declaration of conformity with the relevant standards
- declaration of conformity with the technical documentation
- voltage testing protocol
