SIGMA

PROTECTIVE AND CONTROLLING SYSTEMS FOR POWER LINES-NAMELY, VOLTAGE SENSING CAPACITOR CONTROLS, CURRENT SENSING CAPACITOR CONTROLS, POWER FACTOR SENSING CAPACITOR CONTROLS, OVERCURRENT CONTROLS, MONITORING INSTRUMENTS FOR VOLTAGE CURRENT AND POWER FACTOR; MEASURING, INDICATING AND CONTROLLING INSTRUMENTS-NAMELY, CONTROL PYROMETERS, ELECTRONIC CONTROL METERS, ELECTRONIC SET-POINT CONTROLS, MULTIPOINT CONTROLLERS, DIGITAL METERS, WARNING FLAG MECHANISMS, MULTI-TESTER METERS, PANEL METERS, METER RELAYS AND DIGITAL CONTROL SYSTEMS