METHOD FOR MEASUREMENT OF INSULATION RESISTANCE OF RAIL LINE Russian patent published in 2001 - IPC

FIELD: measurement of insulation resistance of rail line. SUBSTANCE: method consists in the fact that an AC signal is applied to the rail line at its one end, and the voltage and its phase-shift are preliminarily measured at least in four states of the rail line insulation resistance in the other end, two of which are extreme ones, and a system of algebraic equations is solved: , where U₂₁,U₂₂,U₂₃,U₂₄,ϕ₂₁, ϕ₂₂, ϕ₂₃, ϕ₂₄, are voltages and voltage phase-shifts in four states of rail line insulation resistance, respectively, R_ins1(min),R_ins2,R_ins3,R_ins4(max), is the respective rail line insulation resistances, R_ins1(min),R_ins4(max), are the extreme values of rail line insulation resistance, coefficients K₀,K₁,K₂,K₃, are determined, and then the current values of voltage and voltage phase-shift U₂,ϕ₂, are measured, and the actual value of rail line insulation resistance is determined by formula R_if = K₀+K₁U₂+K₂ϕ₂+K₃U₂ϕ₂. EFFECT: enhanced accuracy of measurement. 1 dwg