EP 0239807 B1 19910417 - CAPACITIVE INTRUSION PROTECTION SYSTEM
Title (en)
CAPACITIVE INTRUSION PROTECTION SYSTEM
Publication
Application
Priority
DE 3607017 A 19860304
Abstract (en)
[origin: EP0239807A1] The system has a multiplicity of electrodes (E) which are connected to an evaluation unit (AWE) by coaxial cables (VL). A measuring unit (MIM) arranged in the electrode circuit is used to measure the current (IM) flowing from the generator (SEN) to the electrode (E). Another measuring unit (MIK), in the evaluation unit (AWE), measures the cable current (IK) flowing through the cable capacitance (CK), the screen conductor (Sch) of the coaxial cable (VL) being connected to earth potential (EP) via the measuring unit (MIK). The difference between the measured current (IM) and the cable current (IK) gives the actual electrode current (IE). The ammeters (MIM, MIK) can consist of an instrument transformer (MW) having a third winding (W3) with the same number of turns as the primary winding (PW). The primary winding (PW) is in the electrode circuit, the third winding (W3) is connected between the screen conductor (Sch) and earth potential (EP). <IMAGE>
IPC 1-7
IPC 8 full level
G08B 13/26 (2006.01)
CPC (source: EP)
G08B 13/26 (2013.01)
Designated contracting state (EPC)
AT BE DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0239807 A1 19871007; EP 0239807 B1 19910417; AT E62766 T1 19910515; DE 3769348 D1 19910523
DOCDB simple family (application)
EP 87102947 A 19870302; AT 87102947 T 19870302; DE 3769348 T 19870302