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How do you repair the HV winding of casting resin power transformer dry type 1600 kVA 66042 kV insulation class 155 C degree?
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∙ 10y ago
what do you mean repair hv winding whats wrong with it
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∙ 10y ago
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Usage and advantage of tertiary winding?
A teriary winding is useful for many things. A delta tertiary will help balance voltage/currents to some degree. It also traps third harmonics. In substations, the substation power is often taken from the tertiary. It can also be used as a lower voltage connection for inductors (much cheaper, due to the lower voltage vs. primary connected inductors).
Why you are using on load tap changer in primay of transformer?
The primary windings are bigger In size and it will be more accurate to tap it than tapping the smaller size secondary windings. Answer A tap changer is installed on the high-voltage side of a transformer, regardless of whether that transformer is a step-up or a step-down type. So, it isn't necessarily installed on the primary side of the transformer. The reason for this is that the current on the high-voltage side of the transformer is lower than on the low-voltage side, and the make/break contacts can be smaller. Also there are more turn on the high-voltage side so a finer degree of adjustment can be achieved.
How emf is induced in dc motor?
In brief,in a 3 phase SQIM,there are 3 windings per pole in the stator physically 120 degree apart,each of which is fed from per phase of a balanced 3 phase ac supply.As the magnetic field due to current in each winding varies with time as the current is alternating,the resultant field will be found to keep on changing its direction with time in a circular locus,magnitude being constant because of this setup which can be shown mathematically.Thus a rotating flux of constant mag links the rotor which induces an emf in the rotor,though initially both rotor & stator are static.Another AnswerA three-phase induction motor is, essentially, a transformer. The 'primary' windings being the stator's field windings, and the 'secondary' winding being the bars of the rotor. For this reason, induction motors are often termed 'rotary transformers'. So emfs are induced into the bars by 'transformer action'.Unlike a 'static' transformer, however, the secondary voltages and the frequencies of the voltages vary with the speed of the rotor.
What is the amperage rating of 500 MCM copper conductor?
It depends on a lot of factors. Generally speaking, if the insulation is THHN then the rating is 350 amps. If the insulation is THWN then the rating is 310 amps. The ampere rating for wire depends on the temperature of the environment it will be used in, the insulation rating and the number of circuits installed in a conduit. There are also other factors to consider... like voltage drop in long runs.
Principle and working of single phase induction motor?
Will the principle operation is very complex and would require a fair amount of reading in a text book. But the simple operation of a split phase motor is when a single phase motor has two windings. The main operating winding a and auxiliary winding used to create a rotating magnetic field. The main winding is large wire with lots of turns so under locked rotor conditions it is seen as a large inductive reactance and the aux. winding the smaller wire with fewer turns so it is seen a mainly resistive. This 90 degree phase shift is used to produce more starting torque. If a resistive split phase motor aux. winding is switched out shortly after starting. The aux. winding can also be phase shifted by using a capacitor installed in series with it. This is in the case of capacitor start and capacitor run motors.
What is the meaning of 32Yd1 on a transformer?
This is 3 Nos Two Winding Transformers put together to form of Three Phase transformer, HV is Star Connected & LV is Delta Connected in the LV phase is leading by 30 Degree with respect to HV phase
Why ca you not use a transformer on a DC circuit?
Transformer can not be connected to DC supply because of the reason described as below:In case of AC Supply to the transformer, Current flows through the primary winding when the primary winding is given V1 voltage. So the alternating flux is produced in the core. This flux links with the winding and the emf E1 is used in the winding, which lags V1 by 180 degree. So only magnetizing current is drawn from the supply ( at no load ), whose value is very less.Now if the primary winding is connected to the DC supply, unidirectional flux is produced in the core, which does not induce emf in the primary winding. So the current is limited by the resistance of the winding only. Now the resistance of the winding is very less so it takes large current. So the fuse blows off as soon as the DC supply is given. If the thick fuse wire is used, the primary winding burns out.
What is difference between ACT armored cable and ac armored cable?
Southwire, a manufacturer of this type of cable defines ACT as a multiple conductor thermoplastic insulated cable with steel spiralled interlocking armour. The armour has the appearance of flexible conduit. AC cable is also known as BX cable. Common insulation materials thermoset and thermoplastic as used in AC cable. Type AC cable have different identifiers and insulation type. Type ACTHH has 194 degree (90 degree Celsius) thermoplastic insulation. Type ACTH has 167 degree (75 degree Celsius) thermoplastic insulation. Type AC has thermoset insulation. Type ACHH has 194 degree (90 degree Celsius) thermoset insulation.
How we select a transformer by vectorgroup?
A Vector group is the International Electrotechnical Commission (IEC) method of categorizing the primary and secondary winding configurations of three-phase transformers. Within a polyphase system power transformer it indicates the windings configurations and the difference in phase angle between them. The phase windings of a polyphase transformer can be connected together internally in different configurations, depending on what characteristics are needed from the transformer. For example, in a three-phase power system, it may be necessary to connect a three-wire system to a four-wire system, or vice versa. Because of this, transformers are manufactured with a variety of winding configurations to meet these requirements. Different combinations of winding connections will result in different phase angles between the voltages on the windings. This limits the types of transformers that can be connected between two systems, because mismatching phase angles can result in circulating current and other system disturbances. Symbol designation The vector group provides a simple way of indicating how the internal connections of a particular transformer are arranged. In the system adopted by the IEC, the vector group is indicated by a code consisting of two or three letters, followed by one or two digits. The letters indicate the winding configuration as follows: * D: Delta winding, also called a mesh winding. Each phase terminal connects to two windings, so the windings form a triangular configuration with the terminals on the points of the triangle. * Y: Wye winding, also called a star winding. Each phase terminal connects to one end of a winding, and the other end of each winding connects to the other two at a central point, so that the configuration resembles a capital letter Y. The central point may or may not be connected outside of the transformer. * Z: Zigzag winding, or interconnected star winding. Basically similar to a star winding, but the windings are arranged so that the three legs are "bent" when the phase diagram is drawn. Zigzag-wound transformers have special characteristics and are not commonly used where these characteristics are not needed. * III: Independent windings. The three windings are not interconnected inside the transformer at all, and must be connected externally. In the IEC vector group code, each letter stands for one set of windings. The HV winding is designated with a capital letter, followed by medium or low voltage windings designated with a lowercase letter. The digits following the letter codes indicate the difference in phase angle between the windings, with HV winding is taken as a reference. The number is in units of 30 degrees. For example, a transformer with a vector group of Dy1 has a delta-connected HV winding and a wye-connected LV winding. The phase angle of the LV winding leads the HV by 30 degrees. The point of confusion is in how to use this notation in a step-up transformer. As the IEC60076-1 standard has stated, the notation is HV-LV in sequence. For example, a step-up transformer with a delta-connected primary, and star-connected secondary, is not written as 'dY11', but 'Yd11'. The 11 indicates the LV phase lags 30 degree behind the HV side. Transformers built to ANSI standards usually do not have the vector group shown on their nameplate and instead a vector diagram is given to show the relationship between the primary and other windings.
Do you need an educational degree to become a model?
no you do not just go to a casting call
What size service entrance conductors do you use for a 200amp service?
3/0 copper wire with 90 degree insulation is rated at 210 amps. 75 degree insulation is rated at 200 amps.
What major should you pursue to obtain a career in insulation sealing and ventilating?
In order to work in the insulation and ventilating related industries you do not need a four year college degree, but you can get a 4 year degree in Engineering or Construction Management, and that would give you a leg up in the industry.
What is KNAN transformer cooling?
Each letter in KNAN transformer cooling stands for something different. K indicates a beyond 300-degree Celsius flash point, N denotes natural, and A is equal to air.
What material would be safest to use as an insulator to use to cover electrical wires?
When selecting a material for an insulation factor it has to be balanced between flexibility and its insulation properties. Glass would be an excellent insulator but in the electrical field hard to pull through conduit and bending without damaging the insulation. Cross-linked polyethylene fits both the conditions for a wire insulation. The insulation has a high insulation factor plus the ability to bend without damaging the insulation and can operate in a 90 degree C temperature range.
How cavity wall insulation helps to reduce heat loss?
A major part of the heat transfer through a cavity wall lacking insulation is convection - and to a lesser degree radiation. When insulation is placed in the cavity between the walls it significantly reduces both convection (air doesn't move well through insulation like it does in empty space) and radition (the walls can't "see" each other through the insulation). For the insulation to be effective, the thermal conductivity of the material must be low enough that conduction through the insulation is much less than was present with convection.
What is the temperature of taphole in blast furnace?
I think the temperature of taphole in closed conditon is around 75 degree C to 125 degree C.In opened condition while the casting is on it is 1400degreeC to1480 degreeC.
What is it called when river goes back and forth?
Because the river want to turn 180 degree.
