EDC Cambodia urban underground cable distribution network, Phnom Penh municipal distribution projects, compact prefabricated substations, industrial & commercial power supply, residential area cable ring network, solar plant collector switchgear under EDC
This document applies to the technical requirements for the design, testing, supply, installation, and related supporting equipment (sensors, controllers, cables, etc.) of Ring Main Units on Electric Du Cambodge in 22kV 50Hz HV Switchgear.
ROCKWILL 22kV Ring Main Unit is engineered to fully comply with EDC-DTS-MV003 specification for Cambodia’s 22kV underground distribution network. Rated equipment voltage 24kV, nominal system voltage 22kV, rated continuous current 630A, rated short-time withstand current 20kA / 25kA for 3 seconds. The RMU adopts modular metal-enclosed compact structure; gas-insulated version uses welded stainless steel gas tank with IP67 gas compartment, or optional air/vacuum SF₆-free design. Equipped with mandatory mechanical five-prevention interlock, supports manual operation with motorized actuator and RTU/ SCADA interface for distribution automation. Type tests follow IEC 62271 series standards plus EDC mandatory witness test including internal arc test. Designed for tropical high humidity environment, expected service life 25 years, widely used in Phnom Penh and provincial underground cable distribution projects of EDC.
G3 maintenance-free ring main unit (RMU) for 33kV, 35kV, 40.5kV, offering eco-efficient, compact, and reliable medium-voltage distribution.
Intelligent 12kV eco friendly gas-insulated RMU. Smart energy saving distribution board for reliable and sustainable power systems.
Rockwill RMR series is a compact 12-24kV SF6 gas-insulated switchgear for secondary distribution, compliant with IEC 62271-200 standards.
22kV Ring Main Units (RMUs) are widely used in public infrastructure (like ports and rail transit), urban and rural power grids, and critical facilities such as data centers, thanks to their compact design and high reliability.
Q: How does the internal structure of the 22kV RMU ensure operational safety?
A: The safe operation of 22kV RMUs is ensured by main and load switches for circuit control, fuses for rapid fault isolation, and voltage/current sensors for precise real-time monitoring.
This 22kV ring main unit is designed for Cambodia medium voltage distribution network, used for ring network power supply, feeder sectionalizing and distribution transformer protection, widely deployed in urban and rural distribution projects of Electric Du Cambodge.
The ring main unit follows IEC 62271-200, IEC 62271-103 and IEC 62271-1 standards. Complete type test reports can be provided for technical submission and acceptance by Electric Du Cambodge.
Air insulated and gas insulated versions are both optional. Customers can select suitable type according to site space requirement and Electric Du Cambodge project specification.
The standard rated current is 630A, rated 2s short-time withstand current 20kA, rated peak withstand current 50kA. Customized ratings are available upon request.
The unit is tropicalised design, operating within ambient temperature from -5°C to +55°C. Anti-corrosion enclosure adapts to high humidity and heavy rainy weather in Cambodia.
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