Underground HV MV Power Cable and Metal Pipe Route Locator Wire Path Tracker Cable and Pipe Line Locator GNSS Price

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What should you do when there are cable faults?




Cable fault location is required anywhere where the fault cannot be seen, this is a multi-step process that must be performed as safely and as quickly as possible because customers will be without power.

Step 1 - Cable Isolation & Safety Procedures: A cable fault is nearly always a permanent fault. This means that the cable in question will be in a condition where the protection devices at one or both ends of the cable will have tripped, leaving the cable isolated but NOT earthed (grounded).
The first task is for the Authorised Person for the site to make the cable safe by isolating and then earthing (grounding) one or both ends preferably. Only after the appropriate procedures have been carried out can any testing personnel be allowed to approach the cable and prepare for testing.

Step 2 - Cable Identification: Where multiple cables exist, cable identification testing will identify the correct cable to work on. Clear identification before a cable is cut is intrinsic to safe maintenance work. Any mistakes here can be fatal, and may cause much longer outages for the connected customers

Step 3 - Cable tracing
: When an underground cable is first laid it rarely runs in a straight line, but rather meanders in depth and direction. Cable tracing is done to determine that the route of the cable is following the expected path.

Step 4 - Fault identification: The first major procedure is to determine the phase on which the fault has occurred, and if it is of low or high resistance.
This test determines the correct technique and equipment to diagnose the fault. Typically, if the fault is found to be below 100 Ohms, a low voltage pulse (e.g., 40 V) from a TDR (time domain reflectometer) can be used. If the fault is a higher resistance (> 100 Ohm), a low voltage pulse will likely not see it. For these types of faults, an Impulse generator (shock discharge) will be necessary.

Step 5 – Fault prelocation: A reliable and precise pre-location method is necessary to locate a cable fault quickly and efficiently. Good pre-location can determine the fault position to within a few percent of the cable length and will reduce pinpointing time to a few minutes.
Remember:
a). If it is a low resistance fault, pre-location was likely to be the only means necessary for location.
b). For high resistance faults, ARM (arc reflection) or ICE (impulse current) techniques on an SWG (surge wave generator) should be used. Alternatively, the decay method with an HV DC tester (bridge), can be used for pre-location.

Step 6 - Pinpointing: The aforementioned test methods will get the operator with 5% distance of the fault, acoustic pinpointing techniques must be employed to narrow the margin of error to 0.1%. In most cases, shock discharge generators are used for pinpointing in conjunction with acoustic methods. The discharge creates a loud noise, which is pinpointed precisely using an acoustic pinpointing device. This device evaluates the time difference between the acoustic signal (speed of sound) and the electromagnetic (nearly the speed of light) impulse of the shock discharge. When the shortest time difference is indicated, the exact fault location is revealed.

Step 7 - Re-energisation of the cable: Once all testing and repairs are completed, the Safety/Testing Documentation is cancelled. the cable is then handed back to the appropriate operators to reinstate the cable and re-energise the loads on the newly repaired cable.


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Products Description


Electricity networks have had to become more flexible, reacting more quickly to the changes and needs of higher performance. This demand for flexibility is especially true where multiple generation sources occur, such as the intermittent power from renewables like solar and wind energy. While modern SMART grid technology can quickly identify faults in sub-station and generating units, cable faults can still occur anywhere on the network. Quickly locating a cable fault for repair is the top priority for avoiding lengthy restoration times. In the first place, this will be especially impactful on electrical utility reliability indices. These indices include SAIDI, the System Average Interruption Duration Index, which measures the total duration of an interruption for the average customer during a certain time period, and SAIFI, the System Average Interruption Frequency Index, which is found by dividing the total number of customers interrupted by the total number of customers served.


The VS-2088A(Cable and Pipe Line Locator) Weshine intelligent pipe locator is a high performance underground metallic pipe locating system. It consists a transmitter and a receiver, can be used to do route tracing, pipe exploration and depth measurement of the underground cables and metallic pipes. It can also be used to identify target cable from a bunch of cables, locate the pipe insulation damage and part type cable fault.


PRODUCT INFORMATION
Product Name
Cable and Pipe Line Locator

Model Number
VS-2088A
Certificates
CE; EMC; LVD; ISO;
Typical Application


Power cable, water pipeline, gas pipeline, telecom cable, cathodic protection pipe testing point and other access points, and other line characteristics continuous metal structure






The steps to detect cable fault




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