1. Equipment Overview

Deployed HTA-3300 3P Smart High-Current Source (12A RMS, 36A peak) and HTV-6000 3P Smart High-Voltage Source (180V RMS) paired with the YD-300E Wireless Remote Master for synchronized power injectional testing.

2. Pre-Test Safety Protocols

• Confirmed no parallel testing on adjacent circuits.
• Ensured CT secondary circuits were never open and PT secondary circuits never shorted.
• Validated single-point grounding at injection interfaces to eliminate stray currents.

3. Test Wiring & Configuration

220kV Side Voltage Injection 

• Isolated switch 28007 and bridged its auxiliary contact to enable voltage sampling.

220kV Current Injection

• Ensured switches 4885/2600/2801 were closed, isolating unrelated branches.

110kV Side Setup (Images 5-7)

• Injected 240A at 110kV Line 798 via HTA-3300, phase-reversed to 220kV for differential balance.
• Disabled grounding switches 79830/50130, retaining only critical grounding points.

4. Parameter Configuration

Using the YD-300E Wireless Controller:

• Linked all devices via RF, configuring 0° phase angles for balance testing and 180° reversal for superposition.
• Balanced Mode: Achieved 0A differential current (<0.05A residual) across 220kV/110kV CTs (2500:1 ratio).
• Superposition Mode: Measured 0.096A differential (±0.05% accuracy), validating vector alignment.

5. Results & Compliance

• Confirmed IEC 61869-2/3 compliance in CT/PT ratio and phase displacement.
• Zero differential drift under 40kV simulated knee-point conditions.
• Automated reports generated via HTV-6000’s logging system for audit trails.