SPECIFICATION SHEET • SI METRIC
CAT: ELECTRICAL-ENERGY

Current & Potential Transformer (CT/PT) Ratio

Determine CT and PT transformation ratios and combined metering multiplier for HV/LV power monitoring (IEC 61869).

💡 Engineering Knowledge PrimerInstrument transformers (CTs and PTs) step down high industrial currents and voltages to safe secondary levels (5A / 110V) for digital power meters and protective relays. Multiplying CT ratio by PT ratio gives the overall power metering multiplier.
CALCULATION SCOPE — Deterministic calculation within the published assumptions. Independently verify all design decisions and project-specific code requirements.
INPUT DESIGN PARAMETERS (SI)
A
A
V
V
CALCULATED SPECIFICATION OUTPUT
CT Current Multiplier
⚡
80 :1
PT Voltage Multiplier100 :1
Total Metering Power Multiplier8000 x

Technical Methodology & Engineering Principles

GOVERNING EQUATION
CT Multiplier = Primary Amps / Secondary Amps PT Multiplier = Primary Volts / Secondary Volts Combined Multiplier = CT Multiplier × PT Multiplier
Assumptions & Scope

Standard 5A / 1A CT secondary and 110V PT secondary metering inputs.

Operating Range & Boundary

Use finite, physically meaningful inputs within the stated operating assumptions.