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Statements

Subject Item
dbr:Murray_loop_bridge
rdf:type
yago:ElectricalDevice103269401 yago:WikicatMeasuringInstruments yago:PhysicalEntity100001930 yago:Instrumentality103575240 yago:Artifact100021939 yago:Instrument103574816 yago:WikicatElectricalCircuits yago:Circuit103033362 yago:Whole100003553 yago:MeasuringInstrument103733925 yago:Device103183080 yago:Object100002684
rdfs:label
Murray loop bridge
rdfs:comment
The Murray loop bridge is a bridge circuit used for locating faults in underground or underwater cables. It has been used for more than 100 years but is being replaced by the more precise Time-domain reflectometer. One end of the faulted cable is connected through a pair of resistors to the voltage source. Also a null detector is connected. The other end of the cable is shorted. The bridge is brought to balance by changing the values of RB1 and RB2, which is achieved when: which is equivalent to: where L is the total length of the cable under test - a value proportional to Rg.
foaf:depiction
n8:Murray_loop_bridge.svg n8:Leeds_&_Northrup_Type_S_Test_Set_No._5300.jpg
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dbc:Measuring_instruments dbc:Bridge_circuits
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20294668
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1105823233
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dbr:Resistor dbr:Bridge_circuit dbr:Fault_(power_engineering) dbr:Time-domain_reflectometer dbc:Bridge_circuits dbr:Null_detector dbc:Measuring_instruments n17:Leeds_&_Northrup_Type_S_Test_Set_No._5300.jpg n17:Murray_loop_bridge.svg dbr:Electrical_cable
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dbo:abstract
The Murray loop bridge is a bridge circuit used for locating faults in underground or underwater cables. It has been used for more than 100 years but is being replaced by the more precise Time-domain reflectometer. One end of the faulted cable is connected through a pair of resistors to the voltage source. Also a null detector is connected. The other end of the cable is shorted. The bridge is brought to balance by changing the values of RB1 and RB2, which is achieved when: which is equivalent to: The value of resistance Rx is proportional the length Lx, thus the location of the fault can be calculated: where L is the total length of the cable under test - a value proportional to Rg. The method assumes a single fault exists, of low resistance compared with the undamaged cable insulation resistance, and that the cable conductors have uniform resistance per unit length.
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wikipedia-en:Murray_loop_bridge?oldid=1105823233&ns=0
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2621
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wikipedia-en:Murray_loop_bridge