How to Select the Best Configuration for Power Cable Main Insulation Fault Testing？
To ensure the safe and reliable operation of power systems, it is crucial to locate power cable main insulation faults quickly and accurately. For 35kV, 10kV, and 380V power cable systems with main insulation faults, short circuits, open circuits, grounding, or high-resistance faults, the following testing configurations and methods are recommended.
I. Application Scope
Applicable to main insulation faults, short circuits, open circuits, grounding, and high-resistance faults in 35kV, 10kV, and 380V power cable systems.
II. Testing Objective
To rapidly and precisely locate the exact position of the fault point for excavation, repair, and power restoration.
For more complex cable faults, the following testing methods are recommended:
High-Resistance Fault Elimination Method:Use a high-voltage breakdown source to fully puncture the fault point, then use a fault locator to measure the distance to the fault. Finally, use a pinpoint locator for precise fault location.
Conduit Fault Elimination Method:When the cable runs through PE or PVC conduits, sound synchronization and echo within the conduit make it difficult to locate the fault by listening to discharge sounds. The synchronized acoustic–magnetic method combined with noise reduction effectively eliminates this issue. Since magnetic signals are interference-free, they allow for precise pinpointing.
Water-Ingress Fault Elimination Method:When a cable fault occurs underwater, the discharge sound becomes muffled, and direct contact with the water surface is restricted, making pinpointing difficult. The synchronized acoustic–magnetic method combined with the step voltage method can effectively resolve this. Magnetic signals remain unaffected, and the step voltage method enables water surface contact for accurate location.
III. Testing Solutions
Step
Test Step
General Solution
Function Completion
Step 1
Fault Type Identification
Megohmmeter/Multimeter Measurement
Determine the faulty phase and fault type of the cable, prepare for testing
Step 2
Fault Distance Measurement
Traveling Wave Range Finder (currently in general use), High-Voltage Bridge
Measure the distance to the fault point to provide a general range for precise location
Step 3
Cable Path Detection
Smart Underground Utility Locator
Detect the precise path of cables
Step 4
Precise Fault Location
Acoustic Testing Method, Acoustic-Magnetic Synchronization Method, Step Voltage Method
Ultimately pinpointing the exact location of the fault point
IV. Recommended Product Configuration for GDZX ZX-A Series Power Cable Fault Testing
No.
Product Name
Instrument Function
1
ZX-32B Series High-Voltage Signal Generator (Required)
Generates high-voltage breakdown fault points (true integration: capacitor and discharge ball gap built-in)(Provides high-voltage signal source for pulse current distance measurement, pulse distance measurement, and precise fault location)
2
ZX-Z10 Cable Fault Locator (Required)
Fault Distance Measurement (Automatic distance measurement without manual waveform analysis, foolproof)Automatic Fault Distance Analysis System V3.01, Low-voltage pulse, Pulse current, Remote service (optional features)
3
ZX-A301 Cable Fault Locator (Required)
Pinpoint the exact location of the fault point(Waveform display method, intelligent method directly provides acoustic-magnetic delay values, strong noise reduction, adaptive noise reduction, no noise reduction, path compass display, automatic mute) Industry first
4
ZXPD-3000 Cable Path and Identification Instrument (Required)
Path detection, screen display of cable location and depth, cable identification, real-time depth measurement, intelligent obstacle avoidance, pipeline survey
Scope of Application
Detects various faults in the main insulation of sheathed cables rated at 35kV, 10kV, 380V, etc., including low resistance, high resistance, flashover, open circuits, and ground faults.
All the above testing instruments are available with corresponding models on our official website.Contact us today for personalized recommendations and the optimal configuration to meet your testing needs.
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