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Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36

Product catalog summary

Overview: The document provides detailed specifications and descriptions for Gas Insulated Ring Main Units (RMUs) offered by Ningbo Dowei Electric Co., Ltd. These RMUs are designed for power transmission and distribution, emphasizing high reliability, safety, and low maintenance.

General Description: The RMUs comply with international standards such as IEC 62271, ANSI/IEEE Std C37, and NEMA. They are certified by ISO 9001, KEMA, CESI, CE, TUV, UL, and ASTA. The design includes seismic and structural considerations, suitable for high altitudes up to 5000m. The units are modular, compact, and economically designed for critical power applications.

Specifications:

12kV RMU: Rated voltage of 12kV, withstands power frequency voltage of 42kV (phase to phase/earth) and 48kV (isolating distance). Lightning impulse withstand voltage is 95kV (phase to phase/earth) and 110kV (isolating distance). Rated frequency is 50/60Hz with internal arc classification AFLR 20kA/1s. External protection is IP4X, and gas tank protection is IP67.
24kV RMU: Rated voltage of 24kV, withstands power frequency voltage of 50kV (phase to phase/earth) and 65kV (isolating distance). Lightning impulse withstand voltage is 125kV (phase to phase/earth) and 145kV (isolating distance). Similar frequency and protection ratings as the 12kV RMU.
36kV RMU: Rated voltage of 36/38kV, withstands power frequency voltage of 70kV (phase to phase/earth) and 80kV (isolating distance). Lightning impulse withstand voltage is 170kV (phase to phase/earth) and 185kV (isolating distance). Similar frequency and protection ratings as the 12kV and 24kV RMUs.

Components and Performance:

Busbar System: Rated normal current options are 630A and 1250A, with short-time withstand current of 20kA/3s or 25kA/3s, and peak withstand current of 50kA or 63kA.
Load Break Switch Panel: Rated normal current is 630A, with short-circuit making current options of 50kA or 63kA. Mechanical endurance is M1 class with 5000 operations for load break switches and 3000 for earthing switches.
Circuit Breaker Panel: Rated normal current options are 630A and 1250A, with breaking current options of 20kA or 25kA. Mechanical endurance is M2 class with 10000 operations for circuit breakers.
Switch-Fuse Combination Panel: Normal current for load-break switch is 630A, with fuses at 125A for 12kV, 80A for 24kV and 36kV. Rated breaking current is 31.5kA, with short-circuit making current of 80kA.

Environmental Conditions: The RMUs are designed to operate in humidity conditions up to 100% and temperature ranges from -25℃ to +40℃.

Catalog excerpts

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-1

Power Transmission & Distribution One stop equipments solution Gas Insulated Ring Main Unit (RMU)

Open the catalog to page 1

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-2

General Description: • ISO 9001, KEMA, CESI, CE, TUV, UL, ASTA • Seismic design, ETGI-1.020, IEEE Std 693, NCh2369 • Structural design, ASTM A325, ANSI/AISC 360, AWS D1.1 • High altitude correction per IEC 62271 & IEEE C37, ~ 5000m • High reliability, smart, compact and economic switchgear solutions • Modular design and flexible configuration for both side extensible design • Enhanced personnel safety and low maintenance for critical power application Typical Specification: Gas Insulated Ring Main Unit (RMU) 12kV NINGBO DOWEI ELECTRIC CO., LTD. 608, Lingyun Building No.1, High-tech Zone, Ningbo,...

Open the catalog to page 2

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-3

Rated short-circuit making current Rated capacitive switching current class Mechanical endurance class (Circuit-breakers) Mechanical endurance class (Earthing switch) Electrical endurance class Rated short-time withstand current Mechanism type Switch-fuse combination panel Normal current of load-break switch Normal current with fuses Rated breaking current Rated short-circuit making current Rated transfer current NINGBO DOWEI ELECTRIC CO., LTD. 608, Lingyun Building No.1, High-tech Zone, Ningbo, Zhejiang, China. 315048 Tel: +86-15088801930 | [email protected] | www.dowei-electric.com

Open the catalog to page 3

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-4

General Description: • ISO 9001, KEMA, CESI, CE, TUV, UL, ASTA • Seismic design, ETGI-1.020, IEEE Std 693, NCh2369 • Structural design, ASTM A325, ANSI/AISC 360, AWS D1.1 • High altitude correction per IEC 62271 & IEEE C37, ~ 5000m • High reliability, smart, compact and economic switchgear solutions • Modular design and flexible configuration for both side extensible design • Enhanced personnel safety and low maintenance for critical power application Typical Specification: Gas Insulated Ring Main Unit (RMU) 24kV NINGBO DOWEI ELECTRIC CO., LTD. 608, Lingyun Building No.1, High-tech Zone, Ningbo,...

Open the catalog to page 4

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-5

Open the catalog to page 5

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-6

General Description: • ISO 9001, KEMA, CESI, CE, TUV, UL, ASTA • Seismic design, ETGI-1.020, IEEE Std 693, NCh2369 • Structural design, ASTM A325, ANSI/AISC 360, AWS D1.1 • High altitude correction per IEC 62271 & IEEE C37, ~ 5000m • High reliability, smart, compact and economic switchgear solutions • Modular design and flexible configuration for both side extensible design • Enhanced personnel safety and low maintenance for critical power application Typical Specification: Gas Insulated Ring Main Unit (RMU) 36kV NINGBO DOWEI ELECTRIC CO., LTD. 608, Lingyun Building No.1, High-tech Zone, Ningbo,...

Open the catalog to page 6

Dowei Electric Gas Insulated Ring Main Unit (RMU) HXGN-12,HXGN-24,HXGN-36-7

Open the catalog to page 7

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