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Schweitzer Engineering Laboratories Inc
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Individual
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Publication of CA2024243A1publicationCriticalpatent/CA2024243A1/en
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Publication of CA2024243CpublicationCriticalpatent/CA2024243C/en
239000004973liquid crystal related substanceSubstances0.000titleabstract2
239000004020conductorSubstances0.000abstract3
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Measurement Of Current Or Voltage
(AREA)
Abstract
An indicator for instantaneously indicating the presence of voltage on a monitored electrical conductor of an AC power distribution system utilizes a high impedance liquid crystal display component providing an "N" display in response to an applied signal. The "N" segment display electrode and associated backplane display electrode are capacitively coupled to the monitored conductor and system ground to provide an "N" display when voltage is present on the conductor.
CA 20242431989-11-081990-08-29Circuit status indicator having liquid crystal display
Expired - LifetimeCA2024243C
(en)