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