EXPLANATORY INFORMATION - Surgetek

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4. Capacitive VoltageDetecting SystemsIEC/EN 61243-5 (E DIN VDE 0682 Part415) classifies voltage detecting systemsinto– integrated systems, as fixed part ofthe system/equipment.– separable systems; a portableindicator can be connected to a fixedcoupling system (e.g. DEHNcap/MDS,DEHNcap/M) by means of an interface.Separable voltage detecting systems aresubdivided into two types– passive indicators(e.g. DEHNcap/P)These indicators are supplied withenergy from the measuring circuit.– active indicators(e.g. DEHNcap/A)These indicators comprise an integratedpower supply and self-testingelement.213 67A54Electrical and Mechanical Interface Characteristics of SeparableHR-, LR- and LRM- Voltage Detecting SystemsSystem Input Electrical threshold Socket arrangement Plug Arrangementimpedance conditions at the and min. space area AX c (MW) interface for indicatorof indicator I (µA) U (V) or plugHRhigh 36 2.5 90resistanceA19454,166Ø 41919KCapacitive Voltage Detecting System forHigh Voltage Systems, Basic Circuit Diagram1 Live part of high voltage installation2 Coupling capacity (coupling electrodewith coupling dielectric)3 Connecting lead4 Voltage-limiting device5 Measuring circuit components6 Test point7 Terminal leadK Coupling Unit DEHNcap/MDS,DEHNcap/MA Voltage Indicator DEHNcap/...LRlow 2 2.5 5resistanceA6,5Ø 6,320LRMlow 2 2.5 5resistance,modifiedA144,1Ø 41966451418
5. Equipment for Earthing andShort-CircuitingPortable equipment for earthing andshort-circuiting in accordance withDIN VDE 0683 Part 1 is an equipment formanual use which can be moved towardsand connected to the connecting points ofparts of electrical systems for earthingand short-circuiting purposes (see EN50110 Part 1, Subclause 6.2.4) withoutguidance (e.g. slots, bushings, guiderails). This equipment comprises earthingand short-circuiting devices and earthingrods.An earthing and short-circuiting device isa device which allows both earthing andshort-circuiting of electrical conductors.The earthing device is a device forconnecting the earthing system to a shortcircuitingdevice or to the equipment to begrounded. It consists of a connection(marked 1 in Figures a-d) and an earthingcable (marked 4 in Figures a and b).The short-circuiting device is a device forconnecting the phase conductors to beshort-circuited (marked 6 in Figures a-d).It consists of connections (2 in Figures a-d), short-circuiting cables or bars (3 inFigures a-d) and node connections asrequired (marked 5 in Figures a and b).Note:In the event of a short-circuit, the shortcircuitcurrent flows via the shortcircuitingdevices, for which current thedevices are rated. This is not the case forearthing devices: these do not carry theshort-circuit current and can therefore berated lower (e.g. smaller cross-section ofearthing cables).This reduction of the earthing cablecross-section is not permissible indevices for use in systems with "solidneutral earthing".A short-circuiting bar is a rigid shortcircuitingdevice.Node connections connect the shortcircuitingcables to each other and to theearthing cable or the short-circuiting barto the earthing cable.Connections link the earthing and shortcircuitingcables or bars directly or viaintermediate elements such as cable lugsto the earthing system and the parts of thesystem, where necessary via connectionpoints.Connection points are those points onparts of the system to which the earthingand short-circuiting devices are connected,e.g. cables, bars, fixed ball points,cylindrical bolts, straps.An earthing rod is an insulating rod to beused manually for guiding the connectionsof earthing and short-circuiting devices toparts of power systems for earthing andshort-circuiting purposes. It consists ofan insulating element, black ring, handleand the necessary coupling for the supporof a connecting lead.An insulating element is that part of theearthing rod between black ring and theend of the earthing rod in the direction ofthe connection. It provides the user withthe necessary safety separation andsufficient insulation. The length of theinsulating element I I must be at least500 mm.l G11l ll H714891013Portable equipment for earthing and shortcircuiting1 Connection to earthing system2 Connection to conductor3 Short-circuiting cable4 Earthing cable5 Node connection6 Connection point to earthing system7 Connection point to conductor8 Insulating element of length I l9 Black ring10 Handle of length L H11 Conductor12 Earthing system13 Rod endpiece14 Couplinga6235416237c1Examples of earthing and short-circuitingdevicesa) three-pole with short-circuiting cablesand earthing cableb) three-pole with short-circuiting barand earthing cablec) single-pole with short-circuiting cablesd) single-pole with short-circuiting cablefor earthing a rail trackb6541237d2312325411661 Connection to earthing system2 Connection to conductor3 Earthing and short-circuiting cable orbar4 Earthing cable5 Node connection6 Phase conductor7 Earthing system (earthing bar, rail track)19
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EXPLANATORY INFORMATION - Surgetek

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