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Obligations of the Company

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Equipment and switchgears are operated according relevant standards ... DIN VDE 0105-100 have been carried out ... DIN VDE 0105 - 100. Dangers during change of ... – PowerPoint PPT presentation

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Title: Obligations of the Company


1
Obligations of the Company
The company has to take care that
Equipment and switchgears are operated according
relevant standards
  • The errection, extension and maintenance of the
    switchgears and equipment are carried out by
  • qualified technicians or
  • under supervision of a qualified technician

Device
Weaknesses are immediately eliminated
The switchgear or equipment will be sorted out in
case of dangererous condition.
2
Limit Distances of the Danger Area
Working in the neighbourhood of a switchgear
(ecxceptions 8 BGV A3) is only allowed, if
  • The voltage free state is given and guaranteed
    for the duration of the work
  • Active parts are secured for the duration of the
    work by covering or fences
  • The minimum distances are kept.

Coverage or fences for nominal voltages over 1
kV, with additional air gap
Coverage for nominal voltages upt to 1 000V
7 BGV A3 BGI 548
3
Distance Limits
  • The minimum distances should be

Following protection distances are valid for
activities of technician or instructed persons or
for supervised works
Following protection distances are valid for
civil works and other non-electrical works at the
neighborhood of active parts.
7 BGV A3 BGI 548
4
5 safety Rules
5
Fünf-Sicherheits-Regeln International
6
Process of a Voltage Check
2. Volting testing device at refence voltage
or
Red light
Green light
Red light
7
Ground and Short Circuit
The cable in trenches will be exclusively cut
with agrounded hydraulic scissor. No one is
allowed to stay in the trench during that work !
  • Exception
  • Zero voltage is given
  • and the course in the trench can be indentified!

Short circuit in a trench
Grounding and short circuit is mandatory at the
connection of cable and overhead line.
8
Grounding and Short Circuit
Additional rules for switchgears with nominal
voltages over 1 kV For works on transformers,
both sides are to be grounded and short ciruit,
even if the nominal voltage on the LV side is
under 1 kV. This rule is also valid for three or
multiple winding transformers. Beside grounding
and short-circuit at the working location, at
least one switching location must be earthed and
grounded for overhead lines with a nominal
voltage from 1 kV up to 30 kV. For higher nominal
voltages, all switching locations have to be
grounded and short circuit. Grounding and short
circuit at one of the next poles is allowed in
case of pole breakers.
For works on cables, isolated lines, electrical
equipment, which is connected over spur cables or
isolated lines (i.e. motors) grounding and
short-circuit is not mandatory. But all switching
locations must be grounded and short-circuit. Grou
nding and short circuit is mandatory at the
connection of cable and overhead line. .
9
Working Release
  • The working location can be only released for
    working by the responsible, if
  • Condution allowance (VE) exists
  • All measures according DIN VDE 0105-100 have
    been carried out
  • The responsible person of the switchgear has
    released the working allowance to the working
    responsible
  • All persons, which are involved to the work, are
    instructed by the working responsible.
  • The working release must be clearly formulated.
  • Therefore a written form for the working release
    is mandatory for most distribution companies
    according the operation manual.
  • (Contents local conditions, grounding and
    protection measures, working distances, possible
    dangers)

10
Behaviour at the Working Location
Activities can only be started, if the working
responsible (AVO) has released the working
location.
The working responsible defines the scedule of
work and coordinates the works of the workers in
the plant.
Works should be only carried out, if a order
exists.
The necessary protection clothes have to be used!
The working area should only be left via the
defined exit!
11
Energizing after Termination of the Works
Energizing must be carried out with the same
accuracy as for the de-energizing before the
works. Normally this will be done in the reverse
order.
It is very important to check the working
location for tools or materials, which have been
left, before removing the safety measures.
Eventually, commissioning tests have to be
carried out.
Safety measures should be only removed, if all
persons have left the danger area.
Short circuit and grounding equipment should be
removed at the working location at first and than
at the other locations.
First remove the short circuit and than the
grounding!
Then the siwitchgear has to be assumed to be
under voltage !

12
Energizing after Termination of the Work!
13
Change of Fuses
Dangers during change of fuses Interruption
under load gt arcs Change of fuses
gt weak protection against direct touch
Loaded fuses should only be changed
Fuse load breaker
at circuits with low power by using load
breakers at first if available for LV fuses
with approbriate tools, handled by instructed
persons or technicians. Personal protection
clothes (PSA) have to be used!
DIN VDE 0105 - 100
14
Personal Protection Equipment
Protection hand cuff
Helment with face protection
NSpg.-LiBo
Heavy flammable clothes
Isolating suit
Safety shoed S2 or S3
15
Switching with Second Person
NO statement about no. Of persons in VDE 0105-100
and BGV A3
Exception BGV A1 dangerous works (working under
voltage)
Dangerous works are works with a higher danger
potential due to the process, the kind of work,
the used materials or the environmental
conditions. A higher degree of danger can be
caused by mechanical, electrical, chemical,
biological, thermal influence or radiation.
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