current transformer0 pages

LB5-66(72.5)(TA,TH)(Wi ,W2,W3) Current Transformer

Type description

L B 5-66( 72.5 ) (TA.TH) (W1 ,W2,W3]

Pollution level

Wet tropical zone

Dry tropical zone

Rated voltage (kV)

Design No.

With protective class

Current transformer

I Purpose

It is outdoor, single phase and oil immersed hair-pin type current

transformer, which is used for metering and relay protection of 66kV,

50 or 66Hz system.

I Standards

IEC Standard: IEC60044-1 (Current Transformer)

National Standard: GB1208 {Current Transformer)

GB311.1 (Insulation co-ordination for high

voltage transmission and distribution equipment)

I Service condition

Ambient temperature: -40~+40=C

Altitude: less than 1000m

Environment pollution level: II, Ilk IV

I System condition

System Rated Voltage: 66kV

System Highest Voltage: 72.5kV

System Rated frequency; 50Hz or 60Hz

System neutral earthing method: non-effectively earthed

■ Structure feature

• It is oil/paper insulation system, the primary insulation

is wound from high voltage cable paper. It will be immersed

with transformer oil after desiccating under vacuum. It has

advantages of stable and reliable performance of insulation,

rich successful experience, a long lifetime and convenient

maintenance.

• Perfect fluidity performance of transformer oil is good

for heat Dissipation, it also has self recover ability for

the failure of partial discharge caused by air bubble and

dust.

• The current ratio can be changed easily by change the

connection method of connecting plate on oil conservator

to series or parallel Connection.

• Hermetically sealed stainless steel metallic bellows is

installed on the top, which protect the transformer oil

form moisture and extend the life time, also there is a oil

level gauge on the bellows for observing the changing of

oil volume.

• There is a multi function oil drain valve on the base,

which make it more convenient for sampling, draining and

refilling.

• The primary terminal and secondary terminal board

are made of epoxy casting, the seal performance is more

reliable.

The oil conservator and base etc use DACRAL

(Zinc/Chromate coatings) for resistance to corrosion,

which gives a high degree of corrosion resistance.

• The primary over-voltage protection device and

secondary opencircuit over-voltage protection device can

be provided according to the requirements of user.

Add: Meichi Industrial Zone.Yunlong town, Ningbo City, zhejiang Pronice, P.R.China HTTP://www.top-electric.com

TEL: +86 (574 ) 88079260 FAX: +86 ( 574 ) 88079270 E-MAIL: huayuan@top-electric.com

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