obligations of the company
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
ESTW/ Castor
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
The switchgear or equipment will be sorted out in case of dangererous condition.
3/N/PE AC 50Hz 400V
1 6 A
G erä t
Weaknesses are immediately eliminated
2AC 50Hz 230V~
16A
Obligations of the Company
Device
ESTW/ Castor
§ 7 BGV A3BGI 548
• The voltage free state is given and guaranteed for the duration of the work
Working in the neighbourhood of a switchgear (ecxceptions § 8 BGV A3) is only allowed, if:
• Active parts are secured for the duration of the work by covering or fences
• The minimum distances are kept.
Coverage for nominal voltages upt to 1 000V
HochspannungLEBENSGEFARHR !
Coverage or fences for nominal voltages over 1 kV, with additional air gap
Limit Distances of the Danger Area
Nominal Voltage Distancesto 1000 V coveringup to 6 kV indoor 90 mmup to 6 kV outdoor 120 mmup to 10 kV indoor 120 mmup to 10 kV outdoor 150 mmup to 15 kV 160 mmup to 20 kV 220 mmup to 30 kV 320 mmup to 36 kV 380 mmup to 45 kV 480 mmup to 66 kV 630 mmup to 70 kV 750 mmup to 110 kV 1100 mmup to 220 kV 2100 mmup to 380 kV (Uimp = 950 kV) 2900 mmup to 380 kV (Uimp = 1050 kV) 3400 mmup to 480 kV 4100 mmup to 700 kV 6400 mm
ESTW/ Castor
§ 7 BGV A3BGI 548
• The minimum distances should be
Nennspannung M indest-schutzabstand
bis 1 000V 0,5 m
über 110 kV bis 220 kVüber 220 kV bis 380 kV
3,0 m4,0 m
über 1 kV bis 30 kVüber 30 kV bis 110 kV
1,5 m2,0 m
Tabelle 102: DIN VDE 0105-100 Schutzabstände
4,0 m5,0 m
3,0 m
1,0 m
Nennspannung M indest-schutzabstand
über 110 kV bis 220 kVüber 220 kV bis 380 kV
über 1 kV bis 110 kV
bis 1 000V Schutz-abstand
Tabelle 103: D IN VDE 0105-100 Annährungszone, Schutzabstände
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.
Distance Limits
ESTW/ Castor
5 safety Rules
ESTW/ Castor
Fünf-Sicherheits-Regeln International
ESTW/ Castor
1. Check of the voltage testing device
4. Volting testing device at refence voltage
2. Volting testing device at refence voltage
Red lightRed light
3. Testing of the equipment at all poles
Green lightGreen lightGreen lightGreen light Red lightRed light
Process of a Voltage Check
or
ESTW/ Castor
The cable in trenches will be exclusively cut with agrounded hydraulic scissor.
No one is allowed to stay in the trench during that work !
Ground and Short Circuit
Short circuit in a trench
Exception Zero voltage is given and the course in the trench can be indentified!
Grounding and short circuit is mandatory at the connection of cable and overhead line.
ESTW/ Castor
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.
Grounding and short circuit is mandatory at the connection of cable and overhead line.
.
Grounding and Short Circuit
ESTW/ Castor
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)
ESTW/ Castor
HochspannungLEBENSGEFAHR !
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 working area should only be left via the defined exit!
The 5 safety rules have to be kept under all conditions !
The necessary protection clothes have to be used!
Behaviour at the Working Location
ESTW/ Castor
Energizing after Termination of the Works
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.
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.
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 !
ESTW/ Castor
Energizing after Termination of the Work!
ESTW/ Castor
DIN VDE 0105 - 100
Dangers during change of fuses: • Interruption under load => arcs• Change of fuses => weak protection against direct touch
Loaded fuses should only be changed:
• 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!
Fuse load breaker
Change of Fuses
ESTW/ Castor
Helment with face protection
Protection hand cuff
Safety shoed S2 or S3
Isolating suit
Heavy flammable clothes
NSpg.-LiBo
Personal Protection Equipment
Die Safety association BGFE recommends the exchange of thermoplaqstic helments after 4 years and duroplastic helmets after 8 years
ESTW/ Castor
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.“
All switching actions have to be carried out by two persons in switchgears with no protection against dangerous impacts of arc flash or electrical strike.
If – exceptionally – a dangerous work has to be carried out by one person, approbriate measures have to be taken:
other persons should be in visual distance regular control patrols information system in regular time steps