Three-phase transformers are used to convert the available 3-phase mains voltage into any load voltage.
To cater for the wide range of application areas involved,these transformers are essentially available in
the same kinds of designs as the single-phase transformers, e.g.
Three-phase dry-type transformer:
separate winding version
Three-phase series transformer:
autotransformer winding version
Three-phase safety, isolating, mains or
insulating transformer: separate winding version
In terms of how the 3 coils are connected, there are various options available and each of these provides
the transformers with specific properties. The vector group code is composed of the following elements:
The upper-case letter indicates the higher-voltage winding
(the highest voltage in terms of operation).
The lower-case letter indicates the lower-voltage winding.
The brought-out neutral is indicated by means of N or n
(depending on voltage level).
â?¢ The distinctive number indicates the phase angle of the lower voltage
in relation to the higher voltage (distinctive number multiplied by 30).
The following winding connection options are available
Delta: D, d
Wye (or star): Y, y
Zigzag: Z, z
Example: Dyn5
Higher-voltage winding is delta-connected.
Lower-voltage winding is star-connected with a brought-out neutral.
The lower voltage lags behind the higher voltage by 150�° (5 x 30�°).
Unless specifically requested otherwise, the transformers are configured with a double-star connection
and a brought-out neutral (vector group Yyn0); for autotransformers the vector group is YNa0.
Our three-phase transformer range includes all our standardised types for the 25 30.0 kVA performance range and a frequency of 50/60 Hz
Transformer, High Current Transformer, Ultra Isolation Transformer, Three Phase to Single phase transformer, Control Transformer, furnace Transformers, Special purpose transformers, Electroplating Rectifiers, Reactors, D.C.C.T. etc
Wide range of system current Ratings
Hinged terminal cover
Various mounting options like DIN rail mounting, Wall mounting
Terminal with self lifting screw with dual connection facility giving access from both sides of transformers
Product Details
It is the insulating sleeve that leads the transformer's internal high and low voltage leads to the outside of the oil tank, which not only insulates the ground as the lead, but also plays the role of fixing the lead.
Therefore, the transformer sleeve has the following requirements:
(1) it must have specified electrical strength and sufficient mechanical strength.
(2) must have good thermal stability, and can withstand the short circuit of the instant overheating.
(3) small appearance, small quality, good sealing performance, strong universality and easy maintenance folding.
Transformer bushing insulators are applied as a structure, carrying on conductor through a partition such as transformer tank and insulating it, incorporating the means of attached flange to the partition for medium voltage level.
For Entire Range of Bushings Ratings from - 1 Kv to 72 Kv & - 100 Amp. to 10,000 Amp.
All Ares Insulator transformer bushing insulators are made of ceramic materials according to IEC 672. Other Transformer bushing custom-made insulators can be supplied upon customer's request and specifications.
Toroidal magnetic cores are made of a Fe-based thin (20 microns) nanocrystalline ribbon and have low loss, high induction of saturation, high operating temperature (up to 150 C), high magnetic permeability. Magnetic cores have a negative temperature coefficient of losses that provides stabilization mode transformer temperature.
Application in power high- frequency transformers push-pull,bicyclic SMPS, DC-DC converters, audiotransformers.
High permeability provides good electromagnetic connection of windings and low leakage inductance values.
HIGHLIGHTS OF THE MATERIAL:
Induction amplitude, Bm (25 C) 1,2 T
Induction amplitude, Bm (90 C) 1,1 T
Curie temperature, Tc 570 C
Magnetostriction less than 0,5 x10 ^ -6
Magnetic Permeability (100 kHz) - up to 20,000
Co-based amorphous core in plastic container
1. high permeability
2.Thickness (1820 mkm)
3. Annealing in transverse field, permeability more than 100000, very low loss, flat hysteresis loop
4. Common-mode filter chokes, current transformers, including for precise electronic electricity meters, protective cutout, High Frequency power transformers in SMPS, audio transformers, etc.
5.D from 4-32mm
Ribbon wound magnetic core is placed into hard protective container of glass-polyamide and mechanically fixed with silicone sealant.
Co-based amorphous ribbon wound magnetic core is placed into hard protective container of glass-polyamide and mechanically fixed with silicone sealant.Size veries:outer D =4-32mm.The container has rounded edges and is designed for direct winding of a thick wire. The container provides reliable mechanical protection and preservation of amorphous material's properties. All materials comply with UL94V-1 / 0.
1. High permeability
2.Thickness (1820 mkm)
3. Annealing in transverse field, permeability more than 100000, very low loss, flat hysteresis loop
4. KEY FEATURES OF THE AMORPHOUS MATERIAL:
Induction amplitude, Bm (25C) 0.59 T
Induction amplitude, Bm (90C) 0.50 T
Curie temperature, Tc 220C
Operating temperature range -60C ... 100C
Magnetostriction less than 0.110^-6
Typical permeability (10 kHz) - 120 000
Typical permeability (100 kHz) - 35 000
Co-based amorphous core in plastic container
1. high permeability
2.Thickness (18-20 mkm)
3. Annealing in transverse field, permeability more than 100000, very low loss, flat hysteresis loop
4. Application: Common-mode filter chokes, current transformers, including for precise electronic electricity meters, protective cutout, High Frequency power transformers in SMPS, audio transformers, etc.
KEY FEATURES OF THE AMORPHOUS MATERIAL:
Induction amplitude, Bm(25C) 0.62 T
Induction amplitude, Bm(90C) 0.54 T
Squareness ratio Br/Bm (@ 100 kHz, 80 A/m) at least 0.90
Toroids have the best possible shape from the magnetic point of view. The flux path is completely closed so the capabilities of the ferrite are fully exploited. Especially for high permeability ferrites
the effect of even a minor airgap in the magnetic circuit
can spoil up to 50% of the effective permeability. A further
advantage is the very low leakage fi eld which makes it a
suitable shape for power and pulse transformers.
Ring cores are mainly used for pulse- and wide band transformers and interference suppression coils but also in
special power supplies.
Due to the high saturation fl ux density
of iron powder (950...1600 mT) these
ring cores are very suitable for output
chokes carrying high DC currents.
Another application is found in lamp
dimmers as ballast choke.
The cores are made of electrolytic iron
powder, mixed with a small amount of
resin for insulation. They are coated
with polyamide 11 (thickness 0.1 - 0.3
mm). The isolation voltage between
core and winding is up to 1500 V.
RM cores were designed for use in high Q, high stability fi lter inductors.
Their shape allows economic utilization of surface area on the PCB. The range is standardized in IEC 431 and is available worldwide from many suppliers. The sizes are based on the standard PCB grid distance. RM 5, for instance, fi ts on a board space of 5 x 5 modules of 2.5 mm grid. Coil formers and clips were optimized for automated winding and mounting.
The slots provide suffi cient space for leads of windings. Magnetic shielding is not as good as with P-cores, but still
effective.
The shape of EI cores, more precisely a core set consisting of an E core and an I core, is magnetically equivalent to an E core set with shorter legs. For typical characteristics, see therefore the E core section.
A disadvantage of the classical P core design has always been the narrow wire slots, making it diffi cult to make strong coil formers with integrated solder pins.
In the PTS design this problem is solved by cutting away the sides of both core halves. This creates ample room for wires and coil former fl anges.
A range of special PTS coil formers is available but also most standard P core accessories can be used.
U cores, with rectangular crosssections, are easy to produce and are relatively inexpensive. For this reason they are very popular in low cost applications such as interference fi lters and output chokes in radio and TV equipment. There is no real optimization for transformer winding designs and the core is rather bulky.
Large U cores like U93 and U100 are suitable for very high throughput powers. They can be stacked to form transformers, capable of handling several kW's in applications such as
industrial HF welding.
The ER core design is derived from the original E core and, like
ETD and EC cores, has a round centre pole and outer legs with a
radius to accomodate round coil formers.
These cores are mainly used for power transformers. The round
centre pole allows the use of thicker wires while the shorter turn
length keeps the copper losses low.
PQ cores, like RM/I cores, have round
solid centre poles and round winding
areas.
On the outside the design is
rectangular. Top and bottom of a core
set are completely fl at, allowing good
thermal contact with heat sinks.
PQ cores are mainly used in power
conversion. Therefore they are only
offered in power materials. For most
core sizes matching coil formers are
available.
P cores with solid centre poles have approximately a 15% higher effective area than the corresponding P cores with central hole. This makes them more suitable for applications where high fl ux densities are used. This will be the case in power conversion where the P core is still popular mainly because of its excellent magnetic shielding. This helps to avoid EMI problems, especially
at higher switching frequencies.
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