EARTHING TRANSFORMERS

ETR

WAYS OF ENERGY

EGE, spol. s r.o.

Novohradská 34370 08 České Budějovice

Czech Republic

Tel.: +420 387 764 412Fax: +420 387 764 603

E-mail: elaobch@ege.cz

www.ege.cz

HV BUHV BUHV SHINGS∙ porcelaicelain /n /DIN 42DIN 4253531-1-2/2/∙ Euromoldomold· Pfistesterer Connex

OFOFOFF-LOAD TAP CHANGER

RADIATORS

TRANSFORMERSFORMERSFORMER LIFTING LUGS

RATIRATIRA NG PLATE

OIL LEVEL INDICATOCATOCA RRR∙ magnetic with contact∙ ∙ glasglass ts tubube - DIN 42e - DIN 42555555555

SILICAGEL BREATHERHER∙ DIN 42562 - L1-L3∙ DIN 4∙ DIN 4∙ DIN 4252525676767 - T - T - TYYYP BP BP B

LV BULV BULV SHINGS∙ porcelain DIN 4253030∙ p∙ pororcelaicelain DIN 4n DIN 42525393939

OIL CONSERVATOTOVATOVA R

AUXILIARY TERMINALNALNAL BOX

BUCHHOLZ RELAYLAYLA

OIL THERMOMETER

Fig. 6 ETR earthing transformer – tank with radiators

ETR earthing transformers are used to create an artificial neutral in distribution electric networks:

Typical parameters of ETR earthingtransformers are:• voltage of networks from 6 kV up to

52 kV• rated power from 200 up to 8 000 kVA• connection group ZN, ZNyn 11 or other

variants based on customer s wishes• rated power of secondary side from

50 kVA up to 1 500 kVA

Typical ETR earthing transformers are placed in a corrugated wall tank and hermetically sealed. Typical surface protection of corrugated wall tanks is zinc paint and top coat. Typical colour shade is RAL 7033.

Alternatively larger ETR earthing transformers can be placed in a tank equipped with DIN radiators, an expansion tank and an air breather.

Radiators are hot dip galvanized and painted, the tanks are provided with a zinc layer using spray zinc metallizing method.

The expansion tank is equipped with an oil level gauge.

Bushings are of various types: porcelain DIN or EN bushings, Euromold or Connex cable connectors.

The transfomer oil temperature is monitored by a thermometer or integrated safety detector.

Typical transformer oil used in ETR earthing transformers is Nynas Nytro Libra.

Lugs determined for lifting the completetransformer are placed on the cover or on tank walls under the cover /larger earthing transformers/.

On request ETR earthing transformers are equipped with an off-load tap changer.

ETR earthing transformers are equipped with an oil drain valve placed at the bottom of a transformer.

If required the transformers can be equipped with bi-directional wheels.

Special seismically durable design can beprovided upon request.

EARTHINGTRANSFORMERS

ETR

EGE, spol. s r.o.

Novohradská 34370 08 České Budějovice

Czech Republic

Tel.: +420 387 764 412Fax: +420 387 764 603

E-mail: elaobch@ege.cz

www.ege.cz

Fig. 2 ETR earthing transformer – hermetically sealed

Fig. 1 Earthing transformer in an electricdistribution network

Power transformer

Network

Earthing transformer[Artificial neutral point]

HV BUHV BUHV SHINGS∙ porcelaicelain /n /DIN 42DIN 4253531-2/∙ Euromolomold· Pfistererer Connex

OIL DRAIAIN N VALVE∙ DIN 4∙ DIN 42551/OR-31/

INTEGREGREGRATATED ED SAFESAFETYTY DEDETETECTCTORORcontcontrol the following conditions:∙ preressure∙ tempeemperature· oil lil level· gasassingsingsing

TRANSFORMERSFORMER WHEELS/D/D125, D, D, D16160,0,0, D D20200/0/0/

PRESSURE SAFETYTY VALVE∙ 30 kPa∙ 5∙ 50 0 kPkPa

EARTH CONNECNNECTION∙ M12

TRANSFORMER LIFTINING LUGSLUGS

FREE THERMOMETER POCKET

RATIRATIRA NG PLATE

OFOFF-LOAD TAP CHANGER

CORRUGATED WALLS

TRANTRANTRANSFORMER LIFTING LUGS

SILILICAGEL BREATHER∙ DIN 4∙ DIN 42562 - L1-L3∙ DIN 4∙ DIN 42567 - TYP B

HV BU BUHV BUHV SHINGS∙ porcelaicelain /DIN 42531-2/2/∙ Euromolomold· Pfistestererer Cr Conneonnex

LV BULV BULV SHINGS∙ porcelain DIN 425253030∙ poporcelain DIN 425253939

OIL FILLING HOLE AND PLUGPLUGPLUG∙ DIN 4∙ DIN 42552553 -3 -DD

OIL THERMOMETERER

RATIRATIRA NG PLATE

BUCHHOLZ RELAYLAYLA

OIOIL L LEVELEVEL INL INDIDICACATOTOCATOCACATOCA RR∙ magnetic with conontatact∙ glass tube - DIN 42e - DIN 42555555

OIL CONSERVATOVATOVA R

TRANSFORMER WHEEEELS /D125, D16160, D200/

Fig. 4 ETR earthing transfomer – hermetically sealed

Fig. 5 ETR earthing transformer – corrugated tank with expansion tankFig. 3 ETR earthing transformer – tank with radiators