Apparatus and method for measuring insulated track joint resista

Details Apparatus and method for measuring insulated track joint resista Apparatus and method for measuring insulated track joint resista

1989-12-27

1991-09-03

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Railroad rail flaw testing

324557, 324718, 324606, 324725, B61K 910, G01N 2782

Patent

active

050457870

ABSTRACT:
A technique for measuring the insulation resistance of an insulated rail joint in the presence of leakage ground resistance (ballast resistance), as well as other track run-around paths, without the use of calibrated meters, such technique characterized by the use of a bridge circuit which includes a leg having the insulated joint therein whose resistance is being measured, the other three legs including a resistor of fixed known value and two variable resistors respectively, such that when the variable resistors are varied to obtain simultaneously both (a) the null of the rail, or ballast, current, and (b) ballast in the bridge circuit, the resistance value of the insulated joint is determined.

REFERENCES:
patent: 1765715 (1930-06-01), Byers
patent: 2614151 (1952-10-01), Gilson
patent: 4161688 (1979-07-01), Nakayama
patent: 4651086 (1987-03-01), Domenichini
patent: 4725778 (1988-02-01), Brown

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