Direct answer: C, V and F are common RMU functional-unit designations. C generally denotes a cable load-switch unit, V a vacuum circuit-breaker unit, and F a switch-fuse combination unit. Exact naming and available combinations depend on the product platform.
Key Points
- C unit: feeder switching and ring-cable connection
- V unit: circuit breaker with protection relay for feeder or transformer protection
- F unit: switch-fuse protection for suitable transformer applications
- PT unit: voltage measurement and auxiliary supply functions
- M unit: metering arrangement where required
Selection Guidance
Select functions from the protection study and SLD. A V unit is preferred when relay-based protection, remote tripping or higher protection flexibility is required. An F unit may suit certain transformer ratings, subject to fuse coordination.
Information Required for Engineering Review
Provide the nominal voltage, highest system voltage, rated current, short-circuit level and duration, frequency, application, SLD, BOQ, protection requirements, cable details, installation conditions and quantity. Qiangchi will confirm the project-specific configuration and document requirements.
Engineering Documents and FAT
Available project support may include configuration review, technical clarification, GA drawing, typical SLD coordination, component schedule, routine-test documentation, FAT planning and export packing. Final scope is confirmed according to the approved specification.
Frequently Asked Questions
Can the final selection be made from the voltage and current alone?
No. The SLD, fault level, functional units, protection, cables and service conditions must also be reviewed.
Are all configurations the same size?
No. Dimensions depend on voltage class, functional units, cable arrangement and optional devices. Use the approved GA drawing.
Can Qiangchi review an EPC specification?
Yes. Send the SLD, BOQ and specification for a project-specific technical review.
What is checked during FAT?
The FAT scope may include visual and mechanical checks, wiring verification, interlock checks, functional tests and routine electrical tests according to the agreed inspection plan.
Which standards apply?
The applicable IEC or project standard is confirmed during technical clarification. Project-specific requirements must be stated before design approval.
Where can I compare related products?
Review QCL-12 functional units, configuration review or use the Medium Voltage Product Finder.
Send Your SLD for Review
Qiangchi will evaluate the voltage, rated current, fault level, functional units, drawings, testing and delivery documentation.