Indicator of Presence of Ac Voltage

• Main Authors: LUTO MARIUSZ, CZYZEWSKI JAN, HUBER ROBERT
• Format: Patent
• Language: English
• Published: 21.08.2008
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TESTING

The subject of the invention is an indicator of presence of AC voltage in medium or high voltage conductors and/or conducting elements of transmission and distribution systems, whose basic AC voltage detecting and indicating element is a liquid crystal display ( 1 ). The indicator according to the invention is characterized in that its housing ( 8 ) has the shape of a frame closed by a transparent plate ( 9 ) on the front and by a conducting element ( 10 ) on the back. At least one row of circumferential ribs ( 11 ) is positioned around the frame window. The liquid crystal display ( 1 ) is placed hermetically between the transparent plate ( 9 ) of the frame window and the conducting element ( 10 ) and it has electrodes in the form of conducting segments. One of the conducting segments ( 3 ) is the current-collecting electrode of the indicator, and another of the conducting segments ( 3 ) has a conducting terminal ( 12 ) connected to it, which terminal is connected with the conducting element of the indicator ( 10 ) by a connector ( 23 ), and which terminal is connected through a resistive element ( 13 ), with a terminal ( 7 ) connected to the current-collecting electrode.