FY-12 12kV SF6 Gas-Insulated Ring Main Unit (RMU)

Product Overview

FY-12 12kV SF6 RMU switchgear is developed for reliable power reception, distribution, control and protection in compact secondary substations and ring-network systems. The modular platform supports both non-extendable multi-way units and individual extendable modules, allowing the lineup to be configured for incoming feeders, outgoing feeders, transformer protection, bus coupling, metering and cable connections.

The product is suitable where installation space, environmental resistance and operational simplicity are important. The sealed gas compartment reduces exposure of primary components to ambient air, while mechanical interlocking and clear operating indications support safe switching and maintenance procedures.

Key Advantages

·12kV rating for 10/11kV systems. A clear fit for 10kV and 11kV secondary distribution networks.

·Compact sealed construction. Primary components are enclosed in a 3mm stainless-steel SF6 tank with IP67 protection for the gas compartment.

·Flexible modular functions. Select load-switch, switch-fuse, vacuum circuit-breaker, cable, bus-section, metering and PT modules.

·Fixed or extendable layouts. Standard non-extendable combinations are available from two to six ways, with extendable modules for future network changes.

·Protection options for different feeders. Use F units for fuse-based transformer protection or V units with a vacuum circuit breaker and protection relay.

·Automation-ready options. Motorized mechanisms, status indication, fault indication, measurement and RS485 communication can be specified for remote monitoring and control.

·Wide operating range. Catalogue service conditions cover -40°C to +55°C and installation altitudes up to 2000m.

·Low gas leakage. The catalogue states an annual SF6 leakage rate below 0.01% under specified manufacturing and service conditions.

Main Technical Specifications

Specification note: Values below are based on the supplied FY-12 catalogue. Final ratings depend on the selected functional unit and must be confirmed in the approved datasheet, single-line diagram and type-test documentation.

Parameter	Catalogue value
Rated voltage	12kV
Rated frequency	50Hz
1-minute power-frequency withstand voltage	42kV to earth/between phases; 48kV across isolating distance
Lightning impulse withstand voltage	75kV to earth/between phases; 85kV across isolating distance
Rated current	630A for C unit; according to fuse for F unit; 630A or 1250A V-unit options
Rated short-time withstand current	25kA/4s for 630A configuration; 31.5kA/4s for 1250A V configuration
Rated peak withstand current	63kA for 630A configuration; 80kA for 1250A V configuration
Vacuum circuit-breaker short-circuit breaking current	25kA or 31.5kA, subject to selected V unit
Switch-fuse transfer current	1750A
Maximum fuse rating	125A

Functional Units and Modules

Code	Function	Typical application
C	Load-break switch unit	Ring incoming/outgoing feeder switching; rated current 630A
F	Switch-fuse combination unit	Transformer feeder protection; fuse rating selected for transformer duty
V	Vacuum circuit-breaker unit	Incoming/outgoing feeder protection with relay; 630A or 1250A option
D	Cable connection unit	Direct cable connection without an earthing switch
DE	Cable connection + earthing	Cable connection with an earthing function
SL	Bus sectional load-switch unit	Bus coupling or sectionalizing with a load-break switch
SVBR	Bus sectional breaker unit	Bus coupling or sectionalizing with circuit-breaker protection
BE	Busbar earthing unit	Busbar earthing for maintenance and test arrangements
M	Metering unit	Current and voltage measurement according to the metering scheme
PT	Voltage-transformer unit	Voltage sensing, metering or auxiliary supply according to design

Uganda 11kV SF6 RMU Configuration Example

Project item	Proposed configuration
Nominal system voltage	11kV
Switchgear rated voltage	12kV
Rated frequency	50Hz
Panel configuration	V-V-V
Feeder arrangement	One incoming and two outgoing feeders
Rated current	630A
Circuit-breaker breaking current	25kA
Project short-time withstand requirement	20kA for 1 second
Power-frequency withstand voltage	42kV for 1 minute
Lightning impulse withstand voltage	75kV
Control supply	DC110V
Cable arrangement	Bottom entry and bottom exit
Installation	Indoor

The Uganda project used a compact three-panel arrangement. The incoming panel was designed slightly wider to accommodate the selected voltage indication, protection and control equipment. V-V-V panel arrangement and dimensions:

Panel	Function	Width	Depth	Height
G01	Incoming VCB panel	380mm	770mm	1900mm
G02	Outgoing VCB panel	350mm	770mm	1900mm
G03	Outgoing VCB panel	350mm	770mm	1900mm
Complete lineup	V-V-V configuration	1080mm	770mm	1900mm

Optional Automation and Accessories

·Motorized operating mechanisms for local or remote switching

·Protection relay for V-unit circuit-breaker feeders

·Current transformers and voltage transformers

·Voltage presence indication and cable fault indication

·Ammeter and multifunction measurement devices

·Temperature and humidity controller for the low-voltage compartment

·Remote status, control and telemetry interfaces, including optional RS485 communication

·Low-voltage control box, auxiliary contacts and project-specific terminal arrangements

Applicable Standards

The FY-12 project specification can be prepared against the applicable parts of the IEC 62271 series. The final compliance schedule must match the supplied type-test reports and the destination market requirements.

·IEC 62271-1 - Common specifications for AC high-voltage switchgear and controlgear

·IEC 62271-200 - AC metal-enclosed switchgear and controlgear above 1kV and up to 52kV

·IEC 62271-100 - Alternating-current circuit breakers (for V-unit breaker functions)

·IEC 62271-102 - AC disconnectors and earthing switches

·IEC 62271-103 - Switches above 1kV and up to 52kV

·IEC 62271-105 - AC switch-fuse combinations above 1kV and up to 52kV

·IEC 60529 - Degrees of protection provided by enclosures (IP Code)

Compliance wording: Do not state that the product is certified to a specific edition unless the corresponding valid test report or certificate is available for this exact FY-12 configuration.

How to Select and Order

1. Single-line diagram. Provide the required incoming, outgoing, transformer, bus-section, metering and PT functions.

2. System ratings. Confirm system voltage, rated current, frequency, short-circuit level and earthing method.

3. Transformer or feeder data. State transformer capacity, feeder duty and the required F-unit or V-unit protection philosophy.

4. Cable details. Provide cable type, size, number of cores, termination type and entry direction.

5. Control requirements. Specify manual or motorized operation, control voltage, relay model, communication protocol and SCADA signals.

6. Installation conditions. Confirm indoor/outdoor enclosure, altitude, temperature, humidity, pollution, seismic and corrosion requirements.

7. Documents and tests. List required drawings, routine tests, type-test evidence, inspection, packing and shipping documents.

FAQ

1. Why is the equipment called 12kV when it is used on an 11kV network?

11kV is the nominal system voltage, while 12kV is the standardized rated voltage of the switchgear. The FY-12 is therefore correctly described as 12kV-rated equipment for 10/11kV distribution systems.

2. What is the difference between a fixed and an extendable FY-12 RMU?

A fixed, non-extendable RMU combines the selected functions in one sealed lineup and is suitable when the final circuit arrangement is known. Extendable modules allow additional panels or bus connections to be added, subject to the approved interface and installation design.

3. When should I select an F unit or a V unit?

An F unit uses a load-break switch and high-voltage fuse and is commonly used for transformer protection. A V unit uses a vacuum circuit breaker and protection relay, making it suitable when adjustable relay protection, remote tripping or higher feeder-control requirements are needed.

4. Can the FY-12 RMU be supplied with remote monitoring and control?

Yes. Motorized mechanisms, auxiliary contacts, measurement, fault indication and optional RS485 communication can be configured for remote status, control and telemetry. Confirm the required protocol and signal list during design.

5. What information is required for a quotation?

Please send the single-line diagram, system voltage, rated current, short-circuit level, transformer capacity, cable details, control voltage, protection and communication requirements, environmental conditions, quantity and delivery destination.

6. What are the normal installation limits?

The supplied catalogue lists an ambient range of -40°C to +55°C, relative humidity up to 95% and altitude up to 2000m. Applications outside these limits require project-specific confirmation and possible design correction.

7. Is the gas compartment weather- and pollution-resistant?

The catalogue identifies the sealed gas compartment as IP67. The protection degree of the complete external enclosure is a separate rating and must be confirmed for the selected indoor or outdoor arrangement.

8. Can Fengyuan provide customized combinations and drawings?

Yes. The module sequence, protection scheme, metering, cable interface, low-voltage controls and accessories can be configured from the project requirements. Drawings should be approved before production.

 

Why  Choose Us

Founded in 2010, Henan Fengyuan Power Technology Co., Ltd. is a professional electrical appliance manufacturer with sophisticated equipment, perfect technology and complete testing methods. 

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