SF6 Ring Main Unit/ SF6 RMU

Service condition

Normal Condition

Ambient temperature

Indoor

-5°C to +40°C

Outdoor

-10°C to +40°C

Humidity

90%

Altitude

≤1000m

Pollution

Level I-Light

Level II-Medium

Earthquake

UBC Zone 3

Special Condition

Ambient temperature

Indoor

-15°C to +40°C, -25°C to +40°C

Outdoor

-10°C to +50°C, -25°C to +40°C

-40°C to +40°C

Humidity

95%, 98%

Altitude

≤2000m, ≤3000m, ≤4000m

Pollution

Level III-Heavy

Level IV-Very Heavy

Earthquake

UBC Zone 4

K-factor

3, 5, 7, 9, 11, 13, 15, 17

Standard code

IEC 60694 Common specifications for high-voltage switchgear and controlgear standards

IEC 62271-200 High-voltage switchgear and controlgear-Part 100: AC metal-enclosed switchgear and controlgear for rated voltage above 1 kV and up to and including 52kV

IEC 62271-202 High-voltage switchgear and controlgear-Part 202: High voltage/low voltage prefabricated substation

IEC 62271-105 High-voltage switchgear and controlgear-Part 105: Alternating current switch-fuse combinations

IEC 62271-102 High-voltage switchgear and controlgear-Part 102: High-voltage alternating current disconnectors and earthing switches

IEC standards
62271-200 High-voltage switchgear and controlgear - Part 200:
A.C. metal-enclosed switchgear and controlgear for rated voltage
above 1 kV and up to and including 52 kV.
62271-1 High-voltage switchgear and controlgear - Part 1:
Common specifications.
62271-103 High voltage switches - Part 1: switches for rated voltages above
1 kV and less or equal to 52 kV.
62271-105 High-voltage switchgear and controlgear - Part 105:
High voltage alternating current switch-fuse combinations.
60255 Electrical relays.
62271-100 High-voltage switchgear and controlgear - Part 100:
High-voltage alternating current circuit breakers.
62271-102 High-voltage switchgear and controlgear - Part 102: High-voltage
alternating current disconnectors and earthing switches.
61869-2 Instrument transformers - Part 1: Current transformers.
61869-3 Instrument transformers - Part 2: Voltage transformers.
60044-8 Instrument transformers - Part 8: Low Power Current Transducers.
62271-206 High-voltage prefabricated switchgear and controlgear assemblies
- Voltage presence indicating systems.
62271-304 High-voltage switchgear and controlgear - Part 304:
Design classes for indoor enclosed switchgear and controlgear for
rated voltages above 1 kV up to and including 52 kV to be used in
severe climatic conditions.