Global Patent Index - EP 0988557 A2

EP 0988557 A2 20000329 - METHOD AND APPARATUS FOR INDICATING AN ALTERNATING VOLTAGE

Title (en)

METHOD AND APPARATUS FOR INDICATING AN ALTERNATING VOLTAGE

Title (de)

METHODE UND APPARATE FÜR DIE ANZEIGE EINER WECHSELSPANNUNG

Title (fr)

PROCEDE ET DISPOSITIF SERVANT A INDIQUER UNE TENSION ALTERNATIVE

Publication

EP 0988557 A2 (EN)

Application

EP 98925671 A

Priority

  • FI 9800507 W
  • FI 972513 A

Abstract (en)

[origin: WO9859251A2] The invention pertains to an alternating voltage indicator placed next to an electrical conductor. Indication is based on the detection of an electric field around a live conductor. Energy is taken capacitively (100) from an alternating electric field in order to bring a resonant circuit (200) tuned to the frequency of the alternating voltage into oscillating state. The voltage of the resonant circuit (200) is amplified (300) and converted into an on/off type (400) signal indicating the presence of an alternating voltage. The indicator according to the invention is electrically safe and it indicates the presence of an alternating voltage regardless of whether the alternating voltage source is loaded at that particular point or not.

IPC 1-7

G01R 19/155

IPC 8 full level

G01R 19/155 (2006.01)

CPC (source: EP)

G01R 19/155 (2013.01)

Citation (search report)

See references of WO 9859251A3

Designated contracting state (EPC)

BE DE FR GB IT SE

DOCDB simple family (publication)

WO 9859251 A2 19981230; WO 9859251 A3 19990318; AU 7769498 A 19990104; CN 1260880 A 20000719; EP 0988557 A2 20000329; FI 102643 B1 19990115; FI 102643 B 19990115; FI 972513 A0 19970613

DOCDB simple family (application)

FI 9800507 W 19980612; AU 7769498 A 19980612; CN 98806173 A 19980612; EP 98925671 A 19980612; FI 972513 A 19970613