Download TYPE VOG - Precise

PRECISE
PRECISE VOLTAGE TRANSFORMER
TYPE VOG
PRECISE Voltage Transformers model type
VOG are connected in between phase to earth to
provide a proportional low voltage on secondary
side. They are design to perform the following
functions:
1. Measure/monitor voltage
2. Electrically isolate the instruments and relays
from high voltage side
3. Measure power flow
4. Sense abnormalities in voltage for system
protection
Sealing: The metallic bellow is mounted on the
head of transformer to compensate the oil
expansion due to temperature variation
practically without over-pressure or contact of
oil with ambient air. On all sealing joints used
are the gaskets of oil resistant synthetic rubber
type NBR.
Terminals: Primary Terminal A clamp – type
terminal of tin plated copper for vertical
connection of round conductor.
: Primary Terminal N neutral point
connected to outside on the top of the tank via
porcelain bushing. The neutral point bushing is
intended for testing purpose.
: Secondary provided with M 6 stud
mounted on insulation block, all located in
secondary terminal box and also provided
sealing cable gland at the bottom of the box.
Porcelain Insulator: Is hollow, cylindrical
shaped, chocolate brown glazed, of high
electrically grade porcelain.
Tank made of steel plates, painted with
phosphate coating for rust prevention and double
painted with epoxy resin paint steel.
Insulation: Insulating paper is made of 100% sulphate
wood pulp without additive corresponding to IEC 554.
: Insulating oil is of inhibited mineral oil, with
anti-oxidant additive corresponding to IEC296,
ASTM3487.
Core: Constructed from high grade cold rolled grain
oriented silicon steel.
Windings : Primary is a multi-layer coil of double –
enameled copper wire insulated with insulating paper
between layers and from LV parts.
: Secondary is double enameled copper wire
and is insulated from the core with pressboard and
insulating paper.
Sales Office:
Precise International Corporation Limited
1842, Krungthep-Nonthaburi Road, Bangsue, Bangkok 10800 Thailand
Tel: (662)910-9700-12
Fax: (662) 910-9713-4
Website: http://www.precise.co.th E-mail: [email protected]
June 2007: Rev. 0
PRECISE
PRECISE CURRENT TRANSFORMER
TYPE VOG
TYPE
Type of Insulation
Applied standard
Highest system voltage
Rated voltage factor
Rated primary voltage *
Rated secondary voltage *
No. of secondary winding
Max. rated burden and accuracy
class simultaneously *
Max. thermal burden
Flash over distance
Power frequency withstand
voltage 1 min
Lighting impulse withstand
voltage
Creepage distance
Overall height
Weight of all
Total weight
UNIT
VOG-24
kV
IEC44-2
24
kV
V
22 / sqr3
110 / sqr3
75VA
CL0.2
VA
mm
VOG-36
OIL IMMERSED
IEEE C57.13
IEC44-2
IEEE C57.13
25.5
36
36.5
1.9 / 8 hours
14.4
33 / sqr3
20.125
72
110 / sqr3
67.08
1
75VA
0.3 WXY
CL0.2
0.3 WXY
500 AT 30ºC
480
kV
50
50
70
70
kV(p)
mm
mm
Kg
Kg
125
150
170
200
900
980
16
85
Service Condition
Ambient temp: up to 45ºC
Altitude: up to 1000m above sea level
Pollution: normal or polluted atmosphere
are available
Routine Test are carried out for every voltage
transformer and accordance with the applied
standard:
1. Applied potential dielectric test.
2. Accuracy test
3. Polarity check
4. Partial discharge measurement.
5. Winding resistance measurement.
6. Insulation resistance measurement.
7. Insulation power factor measurement.
Factsheet No: PEM-OSM30-0004
Factsheet Stage 3 Issued On: 08/06/2007
Authorized Dealer:
Revision No. 0 Date: 08/06/2007