FIELD: electrified railways. SUBSTANCE: placed in measuring part of device are selective filter gangs, each filter being tuned to frequency of separate harmonic of traction substation rectified voltage. Filters are connected with divider unit coupled, in its turn, with comparator unit. Device provides checking condition of separate elements of equipment (traction substation ripple filter) and revealing troubles without switching off substation. EFFECT: enhanced convenience and enlarged operating capabilities. 2 dwg
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