|Bicotest T272 Data Sheet (169.3 KB )|
The Bicotest T272 high resistance cable fault locator has been designed to meet the requirements of personnel in locating cable faults in the resistance range from zero to 200 Megohms. Faults can be between two conductors, or between a conductor and it's metallic sheath, concentric neutral or earth.
Easy to operate, the Bicotest T272 features solid state circuitry and utilises a conventional Wheatstone Bridge circuit in which the two sections of the faulty conductor, one on each side of the fault, together with a good conductor if necessary, comprise the two external arms of the bridge. The other two arms of the bridge are contained within the instrument. By employing a detection circuit of extremely high input resistance it is possible to locate high resistance faults without the loss of sensitivity associated with other types of low and high voltage bridges. A ten turn vernier balancing control is provided which indicates the fault position as a percentage of the total loop length. If both ends of the faulty conductor cannot be accessed at the test end, then a good conductor of the same cros ssectional area is required. If the good conductor is of a different size, then a conversion factor may be used to calculate an equivalent loop length. Alternatively, a pair of conductors from an auxiliary cable may be used, or if the cable length is not too great an overland lead may be run out to enable the bridge test to be conducted.
With this bridge arrangement, faults having resistances up to 200 Megohms in dielectrics such as rubber and polyethylene can be located with an accuracy well within +/-0.5% of the loop length and typically 0.1% although this may be limited by the non-uniformity of the conductor.
The Bicotest T272 is contained within a fibreglass housing fitted with a carrying strap. All terminals, controls and null detector micro ammeter are mounted on the top panel for ease of use and connection. The T272 can be used as a compliment to Bicotest TDR's for locating high insulation resistance faults.
Connections at both ends available - eg. ring circuit or cable drum:
Identical good core available:
No good return core available:
|Bicotest T272 Data Sheet (169.3 KB )|
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