Live 10kV Three-Core Cable Identification in Gouqi Island

I. Pre-Test Preparation

II. Working Principle

The transmitter applies a modulated current signal to the cable armor using electromagnetic induction. This current generates an electromagnetic field around the target cable.

The receiver detects this signal using a clamp sensor and analyzes:

Frequency
Phase
Identification Criteria:

When:

The frequency matches the transmitter
The phase matches the calibrated value at the near end
The clamp arrow is pointing toward the far end

? The cable being measured is confirmed as the target cable

III.  Test Process

Step 1: Transmitter Connection

• Install the transmitter clamp on the target cable inside the ring main unit (RMU)
• Ensure the arrow direction points toward the far end
• Turn on the transmitter
• Set frequency to 1280 Hz

Step 2: Near-End Calibration

Before proceeding to the far end, calibration is required:

• Clamp the receiver on the same cable
• Ensure the arrow direction is consistent (toward current flow)
• Set receiver frequency to 1280 Hz

✅ The receiver should display: “Target Cable”

This confirms:

• Proper signal transmission
• Correct receiver operation

Step 3: Far-End Identification

• Move to the identification location (e.g., cable pit)
• Test each cable individually using the receiver clamp

✅ Only one cable will match both:

• Frequency
• Phase

? This cable is confirmed as the target cable

• Mark the cable clearly after identification

IV. Test Summary

This case demonstrates that the EDS-200 cable identification system enables safe, accurate, and efficient identification of energized cables, even in complex environments with multiple cables.

It is particularly suitable for:

• Cable verification before maintenance
• Asset labeling confirmation
• Reducing operational risks in live networks