Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
G01R27/18—Measuring resistance to earth, i.e. line to ground
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
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Physics & Mathematics
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General Physics & Mathematics
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Train Traffic Observation, Control, And Security
(AREA)
Schaltung zur überwachung der isolationswiderstände einer schar von baugruppen einer elektrischen anlage mit gemeinsamer erdfreier stromversorgung, insbesondere einer fernmelde- oder signaltechnischen einrichtung
Einrichtung zur Aufrechterhaltung der normalen Leitfaehigkeit von Kontakt-stellen eines Stromkreises, zwischen denen der Spannungsabfall eine bestimmte Groesse nicht ueberschreiten soll
Schutzvorrichtung zur Vermeidung des Anwachsens des Potentials von durch Transformatoren gespeisten Privatlichtanlagen ueber den Wert des die Lampen speisenden Potentials