17.10.2013 Product Information 1

Portable Earthing Lances

by Dipl.-Ing. (FH) Christian Niklis

I. General

Characteristics, usage, type test,

short-circuit current capacity,

current traces

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Characteristics

Only fixed points for phase and earth

connection are permanently installed in

the substation

When needed, the earthing lance will be

transported to the earthing place, and

connected to the fixed points

The earthing rod is a firm part of the

earthing lance

The earthing lance, together with its fixed

points, is a tested system for which we

guarantee

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Usage

Working procedure following the 5 safety

rules, in de-energised condition

Short circuit-proof connection between

phase conductor and earth installation in

high voltage substations of up to

380/420kV

Conductor heights of up to approximately

8 metres

Installation in nearly any position on

phase supports, or on a number of

different switchgear

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Type tests

Type tests according to IEC 1219/

DIN EN 61219: January 1995, 6.4

(Test of short circuit current capacity)

1999: 80kA/0.5s (peak 200kA)

(IPH-No. 1722.135.9.150)

2009: 63kA/1.0s (peak 158kA)

(IPH-No. 1926.2090727.0637)

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Videos of IPH 1999 and 2009

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Short circuit current capacity

Test values (= rated values):

36 kA for 3.0s

44 kA for 2.0s

63 kA for 1.0s

80 kA for 0.5s and shorter duration

(values are not valid for type 618136)

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Nach dem Kurzschluss ...

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Current traces

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II. System components

Types of earthing lances, phase fixed

points, earth fixed point, extension

rods

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Types of earthing lances

618136: Lg=2900, Li=500, Lh=454mm *)

(short circuit current capacity 63kA/0.5s)

618137: Lg=4100, Li=550, Lh=507mm *)

618138: Lg=6100, Li=550, Lh=807mm

618141: customised

697033: customised *)

*) Handle extendable

(weight for 618138: approx. 17kg)

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Phase fixed points

Diameter of contact cross bar 30mm

Length of cross bar min. 120mm

Distance between cross bar and

conductor clamping or flange plate (clear

opening) min. 120mm

Current-proof design particularly with

higher voltages above 110kV (if needed,

additional measures for field control

need to be taken on site)

Sufficient short circuit current capacity

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Earth fixed point

Type 618135

Mechanical bearing for insertion and

removal of the earthing lance (support

and guidance)

Low resistance electric connection to

earth during insertion procedure

(relief of residual voltages)

Short circuit-proof connection to earth

after complete contacting of the earthing

lance

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Extension rods

698780: L=500mm

618124: L=1000mm

698795: L=1200mm

698781: L=1500mm

698772: L=1700mm

618125: L=2000mm

618111: customised

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III. Project planning and installation

Details of phase conductor, details of

subconstruction, project planning,

installation, adaptor for earth fixed

point , additional earth connection

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Essential:

Fill-in questionnaire completely!

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Details of phase conductor

Height and run (horizontal, vertical, ...)

Material (Al or Cu)

Type (tube, line, single, double or

multiple conductor)

Dimensions (diameter, cross-section,

spacing and alignment of double or

multiple conductors)

If applicable, information about corona

rings, connectors, isolators, etc.

Details of subconstruction

Height

Construction (with photos and drawing of

steel construction, if possible)

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Project planning

Based on the available information, and

after clarification of technical queries, a

project drawing is generated

The project drawing shows all important

components and dimensions, and

permits assessment of feasibility

Commercial offer and installation on site

are based on the project drawing

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Projektierungszeichnung

Video of installation in Hungary

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Adaptor for the earth fixed point

In many cases use of an adaptor is

required

Adaptors need to make safe electric and

mechanic connection between the earth

fixed point and the subconstruction

For production and installation of such

adaptors, ARCUS is ready to offer

advice.

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Additional earth connection

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Installed to some extent, but

not required

(Type tests were passed

without additional electric

connection)

IV. Visual inspection on site

Characteristics for examination (see

also DIN EN 61219: January 1995,

C.3) of earthing lances immediately

before each use

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General characteristics for examination

Is the earthing lance classified for the

respective earthing point?

Is the instruction for use attached or is it

available on site?

Are type lable and other markings clearly

legible?

Is the earthing lance complete – as far

as recognisable?

Is the earthing lance straight?

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Test characteristics for insulated tube

Is the varnish of the insulated tubes still

in good order?

Is the insulated tube free of fissures,

cracks, or other distortions?

Is the hand protection disc mounted and

safely fixed to the insulated tube?

Is the end cap at the end of the insulated

tube mounted?

Is the insulated tube completely turned

back counter-clockwise?

Is the insulated tube easy to turn

(function check)?

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Test characteristics for earth contact

Are the slots in the aluminium tube

completely stress-relieved (parallel

edges)?

Are the slots in the aluminium tube free

of soiling?

Is the surface of the aluminium tube,

especially in the area between the red

dots (contact area), metallic bright, and

free of fissures, cracks, roughness,

burnings?

Are the slots widening up when the in-

sulated tube is turned (function check)? 17.10.2013 43

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Test characteristics for transition between contacts

Is the surface of the aluminium tube free

of fissures, cracks, deformations, or

deep scratches?

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Test characteristics for phase contact

Is the surface of the contact area metallic

bright, free of fissures, cracks, breakings,

roughness, burnings?

Is the centre of the clamp part movable

(function check)?

Is the head of the earthing lance clean

and free of heavy soiling (sand, soil,

etc.)?

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Test characteristics for earth fixed point

Is the surface inside the earth fixed point

free of fissures, cracks, roughness,

burnings, as far as visible?

Is the earth fixed point complete

(especially the stainless steel rings on

both ends of the earth fixed point), as far

as recognisable?

Is the earth fixed point rotatable – as far

as the adjustment of the rotation range

limitation allows (function check)?

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Thank you very much for your attention!

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