Blog talks about the technique used in prelocation of Underground faults on cables especially with high resistance
Prelocation of Cable Faults using Impulse Current Method
Prelocation of Cable Faults using Secondary Impulse Method
Introduction In our earlier blogs, we discussed the prelocation using the Time Domain Reflectometry (TDR) method, for faults like low resistance, short circuit, ingress of moisture, and open circuit faults. Insulation failure / High Resistance faults cannot be determined using a low voltage source of a TDR or Prelocator instrument. In Mid Voltage (MV) to …
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Prelocation of Cable Faults using Time Domain Reflectometer Method
In a three-part series on underground cable fault location, we discussed various aspects of cable fault location – from types and causes of cable faults, methodology for identifying cable faults and finally, we illustrated the step-wise process for detecting faults in underground cables. We also introduced the Time Domain Reflectometer (TDR) method for identifying underground …
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Importance of Velocity of Propagation in TDR Method for UG cable fault location
In the previous blog, we concluded our three-part series on underground cable fault location. To review, we discussed the types of cable faults, methodology for locating cable faults, fault finding through Pre-location techniques and cable route tracing, pinpointing, cable identification and repair and re-test. In Part-2 of our 3 part series, we introduced the methodology …
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Step 2 in Underground Cable Fault Location : Cable Route Tracing, Pinpointing, Cable Identification, Repair & Re-test
In the previous blog we discussed the principle of cable fault pre-location and noted the criticality of this technique towards reducing the time taken to identify location of the fault. We also deliberated upon the various cable fault pre-location techniques. In this blog post, we will continue our ongoing discussion on cable fault location by …
Step-1 in underground cable fault finding: Pre-location Techniques
In the previous blog post, we discussed how electrical utilities are using underground cables to gain a higher degree of reliability. However, underground cable faults can lead to a long downtime, which can further lead to a major revenue loss for electricity utilities. We also discussed the various causes of cable faults and the different …
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Introduction to Underground Cable Fault Location
Energy is a critical facet for human development. Studies evaluating the linkage of electricity and GDP growth estimate that 1% increase in per capital energy consumption results in an increase of per-capita GDP by 0.23%. Given this centrality, development of electricity infrastructure has been a key focus area for governments and policy makers. Power transmission …
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Partial Discharge Testing: Need, Testing Methodologies and Addressing Defects
Studies show that over 85% of disruptive failures in high voltage (HV) and medium voltage (MV) equipment are Partial Discharge related. Partial Discharge (PD) activity provides evidence of deterioration in assets, which can propagate and increase, until the insulation is no longer able to withstand the electrical stress therefore leading to flash-over and finally equipment failure. Therefore, early detection …
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