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  DT 862/DS58 Electromechanical Three-Phase Meter
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Features:
- High
overload capacity and long service life.
- Low loss and
excellent constancy
- Easy for
adjustment and maintenance
- All features
are in line with IEC521 or BS5685
Construction
Driving
Element
The current and
potential cores are made of high quality laminated silicon steel of
superior magnetic characteristics, and the cores have rustproof
treatment.
To improve the
load characteristic and voltage characteristic, current and voltage
cores have been made separately.
The wires of the
current and voltage coils are thoroughly insulated to achieve a high
dielectric strength. Quality packing of voltage coil enable well
protection against humidity.
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Register
The registers are
each secured to the meter frame by means of two-screws or of guide
plate with stops.
A guide plate with
stops enables each register to be removed and replaced very easy.
Registers are
durable for wide temperature range and the figures are easy to be read.
Uni-directional
register can be adopted in the meter for anti-tamper purpose.
Bearing
Upper bearing
consists of a non-lubricated bearing bush and non- corrosive stainless
steel guide pin.
Lower bearing in
the meter can be of double jewel or magnetic one.
1) Double-jewel
lower bearing is the service-proved design fitted to all the watt-hour
meters. The active parts comprise a highly polished steel ball set
between two jewels of sapphire, which is enclosed in a dust-proof
housing. This guarantee excellent friction-free characteristics for a
long service even when it is used under dusty and different condition.
2) Magnetic type
lower bearing
Magnetic lower bearing is of the repulsion type between upper and lower
magnets. The magnets are homopolar magnetized and therefore repel each
other, thus the rotor floats freely on a magnetic cushion and the
rotating assembly is friction free.
And a special
manufacturing process of permanent magnet guarantees high stability of
the magnetic force. This results in long, maintenance-free service life
to the meter.
Meter Rotor
The rotor spindle
is made of phosphor-bronze alloy or aluminum alloy, and the two discs
are fixed to the spindle by means of special die-casting process.
Disc is made of
high purity aluminum sheet and the rated driving tongue is sufficient
to cover the wide load range.
Brake Magnet
The two of double
pole type brake magnets are housed in aluminum alloy by die cast.
The magnets are
made of AlNiCo V with high corrective force and high residual induction
to assure excellent performance during the whole service life.
A special metal part
acting as a magnetic shunt to compensate the error due to temperature
variation with range of -10° C ~ +50° C.
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