Download MV-7 Current Transformer

MV-7 Current
Transformer
Transformers for the North American Market
Type MV-7 Current Transformer
Features
MV-7 Current Transformers are available for indoor metering
applications on 2-wire and 3-wire low voltage 60Hz circuits (700
V or less). Standard primary ratings are 75-1200 amperes and
secondary rating is 5 amperes. The MV-7 has been approved by
Consumer and Corporate Affairs Canada (C.C.A.C.) for revenue
billing (approval number T-268).
»» High-quality, grain-oriented silicon steel cores ensure maximum
accuracy.
MV-7 Benefits
»» Secure nameplate mounting system uses edge guides and a
permanent centre mounting stud.
»» Physically Interchangeable units
»» High-grade grain oriented stell
»» Designed with operator safety in mind
Electricity
»» Secondary terminal arrangement includes compression
connectors for ease of installation.
»» Includes a reliable shorting link with top access and reversible
terminal cover for operator safety.
»» Polyurethane molded unit in a plastic shell produces a compact
transformer with high dielectric and mechanical strength. Outer
shell is injection-molded for a smooth, blemish-free surface.
Construction
MV7 specifications
»» Convenient installation and dependable operation.
Secondary Short Circuit Terminals
»» The height from the base to the primary terminals and the base
mounting dimensions are the same for all ratings.
»» All MV-7 Transformers have secondary short- circuiting terminals
with solderless connectors and a reversing terminal cover. The
cover cannot be fitted or sealed when a meter is connected to
the transformer secondary terminals and the short-circuiting link
is closed.
»» Can often be installed in the same box or cabinet as the meter
they are used with.
»» Primary terminals are identical on all units from 75 to 400
amperes, making these units physically interchangeable.
»» For ease of identification, primary current is indicated in large
yellow numbers on the sides of the transformer. Additional
information is supplied on a full data nameplate conveniently
located on the top of the transformer.
»» The mounting feet are slightly flexible to relieve stress caused by
uneven mounting surfaces.
»» Polyurethane construction technique is a tough, flexible material
that produces a compact, neat and rugged transformer
selected for its high dielectric and mechanical strength, moisture
resistance and excellent thermal conductivity. The outer shell is
injection-molded lexan.
Core & Winding Assembly
»» High-grade, grain-oriented steel is used in the large crosssection, wound core. By rigidly controlling conditions, these
cores are manufactured and heat-treated to produce the best
magnetic properties possible.
»» Primary coil is made from solid copper bar. Terminals are plated
to ensure good contact. High strength silver brazing connects
the terminals to the primary. The secondary winding is brought
out to convenient, easy-to- use secondary terminals molded into
the top of the transformer.
»» Transformers are shipped with the short- circuiting link closed
and the terminal cover in the reversed (short-circuited) position.
When a meter is installed, the terminal cover is removed, the
meter current coils are connected across the transformers
secondary terminals, the short-circuiting link is opened, then
the cover replaced in the normal position. When the meter is
to be removed, the short-circuiting link is closed, the meter
disconnected at the secondary block, and the terminal cover
replaced in the reversed (shortcircuited) position. A secondary
seal wire is included with each transformer.
Insulation Class
»» The MV-7 Current Transformer is for use in 700 volt insulation
class circuits. It meets the Canadian Standards Association type
test requirements f or this insulation class.
Standard Impulse Test (LIL)
»» The impulse test consists of one reduced full wave, two chopped
waves, and one full wave, in sequence. The chopped wave has
a crest voltage of 12 kV with a minimum time to flash over of 1.0
microseconds. The full wave is a 1.2 x 50 microsecond wave
with a crest voltage of 10 kV.
Primary Low Frequency Test
»» The potential test on the primary winding consists of the
application of a 60 Hz test voltage of 4.0 kV rms for one minute
with the secondary grounded.
Secondary Low Frequency Test
»» The potential test on the secondary winding consists of the
application of a 60 Hz test voltage of 2500 V rms for one minute.
Short Time Mechanical Rating
90 times rated current
One Second Thermal Rating
75 to 800 A primaries: 80 times rated current
1000 A primary: 69 times rated current
Shipping Data
Weight
2-Wire Transformers 5 to 1200 Amperes
3-wire Transformers 200 to 400 Amperes
Net Weight
3.5 kg (7.8 lbs)
4.0 kg (8.8 lbs)
Gross Weight
3.9 kg (8.6 lbs)
4.4 kg (9.7 lbs)
Specifications
Ratio (A)
60 Hz Metering Accuracy
CONT. Thermal Rating
Catalog Number
Primary
Secondary
2-wire
3-wire
2-wire
3-wire
2-wire
3-wire
75
5
0.3 B 0.9
-
1.5
-
917246
-
100
5
0.3 B 0.9
-
1.5
-
917247
-
150
5
0.3 B 0.9
-
1.5
-
917248
-
200
5
0.3 B 0.9
0.3 B 0.5
1.5
1.5
917249
917261
250
5
0.3 B 0.9
0.3 B 0.5
1.5
1.5
917250
917262
300
5
0.3 B 0.9
0.3 B 0.5
1.5
1.5
917251
917263
400
5
0.3 B 0.9
0.3 B 0.5
1.5
1.5
917252
917264
500
5
0.3 B 0.9
-
1.5
-
917253
-
600
5
0.3 B 0.9
-
1.5
-
917254
-
800
5
0.3 B 0.9
-
1.5
-
917255
-
1000
5
0.3 B 0.9
-
1.5
-
917256
-
1200
5
0.3 B 0.9
-
1.5
-
917257
-
Metering accuracies are applicable to the full Continuous Thermal Ratings. Accuracies listed are those
approved by Consumer and Corporate Affairs Canada for revenue metering.
Specifications
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