11kV CT and VT Panel Checklist
Engineering Intent
CTs and VTs in 11kV panels must be coordinated with metering, protection, wiring and compartment layout.
This article is written for engineers, EPC buyers and procurement teams who need to turn 11kV CT and VT panel coordination into a clear technical request instead of a vague product inquiry.
Key Selection Data
| Item | Data to Confirm |
|---|---|
| Check 1 | CT ratio and VT ratio |
| Check 2 | Accuracy class and burden |
| Check 3 | Panel wiring and terminal blocks |
| Check 4 | Fuse and grounding arrangement |
Standards and Evidence to Request
- IEC 61869
- IEC 62271 switchgear references
- Panel schematic approval
For project approval, request a technical datasheet, outline drawing, wiring or terminal diagram where applicable, routine test report and nameplate information before shipment.
Common Specification Mistakes
- CT and VT selected separately from panel design
- No terminal diagram
- No burden calculation
RFQ Checklist
- Attach panel schematic
- Confirm all ratios
- State meter and relay models
- Request coordinated wiring diagram
Related Product Paths
Ziyao Power can review the single-line diagram, load schedule, panel drawing or tender sheet and convert the requirement into a practical quotation package.
Download This Guide as PDF
Save this technical guide for offline reference. Includes all tables, specifications, and contact information.
Related Articles
Current Transformer Ratio Selection Guide
CT ratio should match feeder current, meter or relay input, accuracy requirement and future load margin.
CT Accuracy Class 0.5 vs 5P Explained
Metering CTs and protection CTs use different accuracy classes, so 0.5 and 5P should not be treated as interchangeable.
Current Transformer Burden Calculation
CT burden must include meter or relay load plus secondary cable resistance to maintain accuracy.