QCG (STQCG)-12 / SF6-free product family
12 kV solid-insulated ring main unit
A solid-insulated RMU for 12 kV, 50 Hz distribution projects. Select the C, F and V functions, protection and cable interfaces around your project scheme and SF6-free requirement.
No drawing yet? Start with your country, application and a short description.
QCG-12 / Product overview
A solid-insulation route for an SF6-free specification
Keep the insulation system, feeder functions and project environment visible throughout selection.
Solid-insulated primary system
The QCG (STQCG)-12 catalogue describes APG solid insulation for the primary conductive system.
C / F / V functional units
Coordinate load switching, fused protection or vacuum circuit-breaker protection to the feeder requirements.
Project-specific evidence
Review the selected units, service environment and required tests. Market or utility acceptance is assessed for the destination project.
Technical reference
Key specifications and their application
Use the reference values below to start selection. The confirmed unit, drawings and technical agreement define the supplied equipment.
On a small screen, scroll the table horizontally to see the scope of each value.
| Item | Reference | How to apply it |
|---|---|---|
| Product family | QCG (STQCG)-12 | Solid-insulated / SF6-free |
| Rated voltage | 12 kV | Documented series scope |
| Rated frequency | 50 Hz | Documented series scope |
| Rated current reference | 630 / 1250 A | Catalogue options; confirm the selected functional unit |
| Power-frequency withstand | 42 kV; 48 kV isolating distance | Catalogue values, 1 min |
| Lightning impulse withstand | 75 kV; 85 kV isolating distance | Catalogue values |
| Short-time withstand reference | 25 / 31.5 kA, 4 s | Catalogue range; confirm selected unit and report scope |
| Peak withstand reference | 63 / 80 kA | Catalogue range; confirm selected unit and report scope |
| Dimensions and installation | Project-selected arrangement | GA drawing controls the final line-up and interfaces |
Configuration & interfaces
Three core feeder functions, one project scheme
Start with the feeder task and confirm the required ratings and evidence for each functional unit.
Load-switch unit
Incoming, outgoing or ring-main switching selected to the network arrangement.
Switch-fuse unit
Transformer-feeder protection with fuse selection and protection coordination for the project.
Vacuum circuit-breaker unit
Feeder protection and control with the required relay functions, instrument transformers and auxiliary supply.
Technical documents
Find the document for your next decision
Use product information for initial selection, then confirm project drawings and the evidence for the exact equipment you specify.
Engineering documents
QCG-12 technical information
Request the controlled 12 kV / 50 Hz catalogue and rating schedule for your selected functional units.
Request technical documentsEngineering documents
AY0502452-2020
Listed for QCG (STQCG)-12 C/F/V units. Review the stated model and scope before specifying the evidence.
View report informationEngineering documents
Request the full report
Identify the selected unit and required tests so the applicable document can be reviewed.
Request the full reportWorking with Qiangchi
A clear path from requirements to agreed supply
For EPCs, panel builders, contractors and local partners, start with the equipment schedule and the responsibilities for the project.
Share the SLD / BOQ
Send your equipment requirements, destination and available specification.
Review the configuration
Clarify equipment scope, interfaces and applicable technical documents.
Receive the proposal
Review the project-specific technical proposal and quotation.
Agree the supply
Confirm the drawings, equipment, inspection documents and commercial scope.
The local partner handles local engineering and market-access requirements. Qiangchi supplies the equipment and documentation agreed for the order.
Selection questions
QCG-12 questions
What is a solid-insulated RMU?
It uses solid insulation around the main circuit and is intended for compact medium-voltage distribution applications.
Where is it used?
Typical applications include utility distribution, industrial plants, infrastructure, renewable-energy projects and compact substations.
Which functional units are available?
Cable switch, circuit-breaker, metering, PT and project-specific combinations can be arranged according to the SLD.
What rated current is available?
Typical 630A and 1250A configurations can be evaluated; final ratings follow the controlled product schedule.
How is the short-circuit rating selected?
It must match the project fault-level study, protection philosophy and applicable technical specification.
Are dimensions fixed?
No. Dimensions depend on functional units, interfaces and the final lineup. The approved GA drawing controls production.
What information is needed for quotation?
Send voltage, current, fault level, SLD, quantity, cable and protection requirements.
Can engineering and FAT support be provided?
Yes. Technical clarification, GA drawings, routine tests and agreed FAT support are available for confirmed projects.
Prepare your enquiry
Bring the details you already have
You do not need a complete tender package to start. These details help move the enquiry towards a configuration and quotation.
- Country and applicable utility requirements
- SLD and C / F / V unit arrangement
- Rated current and short-circuit duty
- Protection, metering and automation requirements
- Cable details and installation environment
- Quantity, required evidence and schedule
Discuss your QCG-12 requirement
Turn the project requirements into an equipment scope.
Share your application, drawings or specification. We can help clarify the configuration and documents needed for a project-specific offer.
Prefer email? sales@zgqci.com