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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