The extensible ring main unit shall be suitable to operate under system parameters given in SEC specification 01- SDMS-01 latest revision. Electrical and mechanical strength of extensible ring main unit shall be designed to operate in a system to withstand a short circuit current of 21 kA for 1 second or more at 13.8 kV nominal voltage.
Requirements for Indoor Ring Main Units (only). Energy metering units (4-wire) must be suitable for direct connection to adjacent extensible switch-disconnectors and fuse-switches or circuit breaker RMUs.
This document specifies the minimum technical requirements for design, engineering, manufacturing, testing and performance of indoor/outdoor gas (SF6) insulated, non-extensible ring main unit (RMU), intended to be used in 13.8 kV medium voltage system of the Saudi Electricity Company (SEC) in Saudi Arabia.
The Ring Main Unit (RMU) shall be installed at 11kV junction points to have a continuous supply by isolating faulty sections. The RMU shall be extensible on both sides and consists of the following combinations of load break switches and Circuit breakers for a nominal voltage of 12 kV using SF6 gas as insulating and Vacuum as arc quenching medium.
Electrical and mechanical strength of extensible ring main unit shall be designed to operate in a system to withstand a short circuit current of 21 kA for 1 second or more at 13.8 kV nominal voltage. Ring switch shall be load breaking and fault-making type.
As the ring main switchgear unit is to be installed in ground-mount kiosks (non-walkable) of low profile and compact construction, the Equipment must have minimum dimensions and be of low mass and vandal-proof. Preference must be given to Equipment having minimum dimensions that do not exceed the following:
32-SDMS-01
SF6 INSULATED RING MAIN UNIT, 17.5KV Issue Date: 03/2022 Page: 1 of 25 32-SDMS-01 REV.03 1 32-SDMS-01 Rev.03 SPECIFICATIONS FOR NON-EXTENSIBLE SF6 INSULATED …
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The Ring Main Unit (RMU) shall be installed at 11kV junction points to have a continuous supply by isolating faulty sections. The RMU shall …
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JD Auspice Co.,Ltd. TEL: 886-2-8991-2796 FAX: 886-2-8991-9298 service@jdauspice 05 note: subject to change without any no ce, JDA pay no responsibility S: …
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Ring Main type equipment are Schneider Electric (Ringmaster range) and Lucy (Sabre range). Indoor HV circuit breakers must comply with WPD Engineering
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32-SDMS-03 SPECIFICATIONS FOR
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32-SDMS-03 SPECIFICATIONS FOR
The extensible ring main unit shall be suitable to operate under system parameters given in SEC specification 01- SDMS-01 latest revision. Electrical and mechanical strength of extensible ring …
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