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10kV Power Cable Fault Detection and Location – Austin, Texas

2026-08-08

Power Cable Fault Test Report

Date
March 15, 2026

Location
Austin, Texas, USA

Cable Voltage Level
10 kV

Fault Type
Phase-to-Ground Leakage

1. Site Conditions

Cable Ends	One end on utility pole, the other in an outdoor ring main unit (RMU)
Cable Route	Unknown (direct-buried installation)
Joint Locations	Unknown
Insulation Resistance	Phase A: leakage to ground; Phases B & C: normal
Additional Notes	Direct-buried cable; termination at utility pole

2. Test Equipment Used

Insulation Tester 5 kV Insulation Resistance Tester

High Voltage Source 5-50 kV Test Transformer + 15-4×2 Capacitor

Pre-location Device XHGG502 Cable Fault Locator

Pinpointing Device XHDD503 Cable Fault Pinpointer

3. Testing Procedure & Results

3.1 Insulation Resistance Test

Phase A to ground: 0.6 MΩ (failed)

Phases B and C: insulation intact

3.2 Route Tracing

Not performed — cable path was estimated using electromagnetic field detection on Model 503.

3.3 Pre-location (Fault Distance Ranging)

Low-voltage pulse method (Phase A to ground): 136 m — open-circuit waveform
Phase B to C reference measurement: 220 m
High-voltage arc reflection method: 127 m

3.4 Precise Pinpointing

Using the Model 503 acoustic pinpointing device, the fault point was precisely located at 130 meters from the test point. The electromagnetic field detection feature on the 503 unit was instrumental in roughly determining cable position where the route was undocumented.

Precise PinpointingPrecise Pinpointing

3.5 Withstand Voltage Test

Not performed.

4. Summary & Key Takeaways

📌 The faulted cable section was relatively short, which facilitated efficient location.
📌 Although the cable route was undocumented and the pole-end termination could not be grounded for traditional methods, the Model 503 electromagnetic field detection capability successfully indicated the approximate cable path.
📌 The combination of low-voltage pulse (136 m), high-voltage arc reflection (127 m), and acoustic pinpointing (130 m) yielded consistent distance measurements, confirming fault location accuracy.
📌 Phase A insulation resistance of 0.6 MΩ confirmed a phase-to-ground leakage fault requiring immediate repair.

Test Personnel: Qiao Yifan & Ge Haojie | XZH TEST Electrical Testing Solutions

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