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Wiztech Automation Solutions Pvt Ltd.102, W-Block, 2nd Floor, 2nd Avenue, (Next to Indian Bank), Anna Nagar, Chennai, Tamil Nadu, India Pincode : 600 040 Landline : 044-2620 9369, Mobile : +91-99404 26826 [...]...

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Scott-T Transformer Connection Overview - Wiztech Automation

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Transforming 3 Phase to 2 Phase

There are two main reasons for the need to transform from three phases to two phases,

To give a supply to an existing two phase system from a three phase supply.To supply two phase furnace transformers from a three phase source.

Two-phase systems can have 3-wire, 4-wire, or 5-wire circuits. It is needed to be considering that a two-phase system is not 2/3 of a three-phase system. Balanced three-wire, two-phase circuits have two phase wires, both carrying approximately the same amount of current, with a neutral wire carrying 1.414 times the currents in the phase wires. The phase-to-neutral voltages are 90° out of phase with each other.

Two phase 4-wire circuits are essentially just two ungrounded single-phase circuits that are electrically 90° out of phase with each other. Two phase 5-wire circuits have four phase wires plus a neutral; the four phase wires are 90° out of phase with each other.

 

Scott-T Connection - 2 and 3 phase wire connection

 

The easiest way to transform three-phase voltages into two-phase voltages is with two conventional single-phase transformers. The first transformer is connected phase-to-neutral on the primary (three-phase) side and the second transformer is connected between the other two phases on the primary side.

The secondary windings of the two transformers are then connected to the two-phase circuit. The phase-to-neutral primary voltage is 90° out of phase with the phase-to-phase primary voltage, producing a two-phase voltage across the secondary windings. This simple connection, called the T connection, is shown in Figure

The main advantage of the T connection is that it uses transformers with standard primary and secondary voltages. The disadvantage of the T connection is that a balanced two-phase load still produces unbalanced three-phase currents; i.e., the phase currents in the three-phase system do not have equal magnitudes, their phase angles are not 120° apart, and there is a considerable amount of neutral current that must be returned to the source.

 

The Scott Connection of Transformer

A Scott-T transformer (also called a Scott connection) is a type of circuit used to derive two-phase power from a three-phase source or vice-versa. The Scott connection evenly distributes a balanced load between the phases of the source.

Scott T Transformers require a three phase power input and provide two equal single phase outputs called Main and Teaser. The Main and Teaser outputs are 90 degrees out of phase. The MAIN and the Teaser outputs must not be connected in parallel or in series as it creates a vector current imbalance on the primary side.

MAIN and Teaser outputs are on separate cores. An external jumper is also required to connect the primary side of the MAIN and Teaser sections.

The schematic of a typical Scott T Transformer is shown below:

 

Typical Scott T Transformer schematic diagram

 

Scott T Transformer is built with two single phase transformers of equal power rating. The MAIN and Teaser sections can be enclosed in a floor mount enclosure with MAIN on the bottom and Teaser on top with a connecting jumper cable. They can also be placed side by side in separate enclosures.

Assuming the desired voltage is the same on the two and three phase sides, the Scott-T transformer connection consists of a center-tapped 1:1 ratio main transformer, T1, and an 86.6% (0.5√3) ratio teaser transformer, T2. The center-tapped side of T1 is connected between two of the phases on the three-phase side. Its center tap then connects to one end of the lower turn count side of T2, the other end connects to the remaining phase.

The other side of the transformers then connects directly to the two pairs of a two-phase four-wire system.

 

Scott-T connection convert 3-phase to 2-phase

 

The Scott-T transformer connection may be also used in a back to back T to T arrangement for a three-phase to 3 phase connection. This is a cost saving in the smaller kVA transformers due to the 2 coil T connected to a secondary 2 coil T in-lieu of the traditional three-coil primary to three-coil secondary transformer. In this arrangement the Neutral tap is part way up on the secondary teaser transformer .

The voltage stability of this T to T arrangement as compared to the traditional 3 coil primary to three-coil secondary transformer is questioned.

 

Key Points

If the main transformer has a turn’s ratio of 1: 1, then the teaser transformer requires a turn’s ratio of 0.866: 1 for balanced operation. The principle of operation of the Scott connection can be most easily seen by first applying a current to the teaser secondary windings, and then applying a current to the main secondary winding, calculating the primary currents separately and superimposing the results.

 

Load connected between phaseY1 and phase Y2 of the secondary:Secondary current from the teaser winding into phase X1 =1.0 <90°Secondary current from the teaser winding into phase X2 =-1.0< 90°Primary current from H3 phase into the teaser winding= 1.1547< 90°Primary current from H2  phase into the main winding= 0.5774 <90°Primary current from H1 phase into the main winding= -0.5774< 90°The reason that the primary current from H3 phase into the teaser winding is 1.1547 due to 0.866: 1 turn’s ratio of the teaser, transforming 1/0.866= 1.1547 times the secondary current. This current must split in half at the center tap of the main primary winding because both halves of the main primary winding are wound on the same core and the total ampere-turns of the main winding must equal zero.

 

Load connected between phase X2 and phase X1 of the secondary:Secondary current from the main winding into phase X2 =1.0< 0°Secondary current from the main winding into phase X4= -1.0 <0°Primary current from H2 phase into the main winding =1.0 <0°Primary current from H1 phase into the main winding=- 1.0 <0°Primary current from H3 phase into the teaser winding= 0Superimpose the two sets of primary currents:I H3= 1.1547 <90° +0= 1.1547 <90°I H2 =0.5774 <90° +1.0< 0°= 1.1547 < 30°I H1 =0.5774 <90°+ 1.0 <0°=1.1547 <210°Notice that the primary three-phase currents are balanced; i.e., the phase currents have the same magnitude and their phase angles are 120° apart. The apparent power supplied by the main transformer is greater than the apparent power supplied by the teaser transformer. This is easily verified by observing that the primary currents in both transformers have the same magnitude; however, the primary voltage of the teaser transformer is only 86.6% as great as the primary voltage of the main transformer.Therefore, the teaser transforms only 86.6% of the apparent power transformed by the main.We also observe that while the total real power delivered to the two phase load is equal to the total real power supplied from the three-phase system, the total apparent power transformed by both transformers is greater than the total apparent power delivered to the two-phase load.The apparent power transformed by the teaser is 0.866 X IH1= 1.0 and the apparent power transformed by the main is 1.0X IH2 =1.1547 for a total of 2.1547 of apparent power transformed.The additional 0.1547 per unit of apparent power is due to parasitic reactive power owing between the two halves of the primary winding in the main transformer.Single-phase transformers used in the Scott connection are specialty items that are virtually impossible to buy ‘‘off the shelf ’’ nowadays. In an emergency, standard distribution transformers can be used.

 

Advantages of the Scott T Connection

If desired, a three phase, two phase, or single phase load may be supplied simultaneously. The neutral points can be available for grounding or loading purposes

 

Disadvantages when used for 3 Phase Loading

This type of asymmetrical connection (3 phases, 2 coils), reconstructs three phases from 2 windings. This can cause unequal voltage drops in the windings, resulting in potentially unbalanced voltages to be applied to the load.

The transformation ratio of the coils and the voltage obtained may be slightly unbalanced due to manufacturing variances of the interconnected coils.

This design’s neutral has to be solidly grounded. If it is not grounded solidly, the secondary voltages could become unstable. Since this design will have a low impedance, special care will have to be taken on the primary protection fault current capacity. This could be an issue if the system was designed for a Delta-Star connection.

The inherent single phase construction and characteristics of this connection produces a comparatively bulky and heavier transformer when compared with a normal three phase transformer of the same rating.

 

Application

Main application is for For Industrial Furnace Transformer.

For Traction Purpose: The power is obtained from the 220 kV or 132 kV or 110 kV or 66 kV, three-phase, effectively earthed transmission network of the State Electricity Board, through single-phase transformers or Scott connected transformer installed at the Traction Substation. The primary winding of the single-phase transformer is connected to two phases of the transmission network or Where Scott-connected transformer is used, the primary windings are connected to the three phases of the transmission network.

The single-phase transformers at a Traction Substation are connected to the same two phases of the transmission network (referred as single-phase connection), or alternatively to different pairs of phases- the three single phase transformers forming a delta-connection on the primary side. Out of three single-phase transformers, one transformer feeds the overhead equipment (OHE) on one side of the Traction Substation, another feeds the OHE on the other side of the Traction Substation, and the third remains as standby. Thus the two single-phase transformers which feed the OHE constitute an open-delta connection (alternatively, referred as V-connection) on the three-phase transformers network.

The Scott-connected transformer and V-connected single-phase transformers are effective in reducing voltage imbalance on the transmission network. The spacing between adjacent substations is normally between 70 and 100 km.

 

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PLC Application For Speed Control of AC Motors With Variable Speed (VS) Drive - Wiztech Automation

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C Motor Drive Interface

A common PLC application is the speed control of AC motors with variable speed (VS) drives. The diagram in Figure 1 shows an operator station used to manually control a VS drive.

The programmable controller implementation of this station will provide automatic motor speedcontrol through an analog interface by varying the analog output voltage (0 to 10 VDC) to the drive.

The operator station consists of:

a speed potentiometer (speed regulator),a forward/reverse direction selector,a run/jog switch, andstart and stop push buttons.

The PLC program will contain all of these inputs except the potentiometer, which will be replaced by an analog output.

The required input field devices (i.e., start push button, stop push button, jog/run, and forward/ reverse) will be added to the application and connected to input modules, rather than using the operator station’s components.

The PLC program will contain the logic to start, stop, and interlock the forward/reverse commands.

 

Figure 1 - Operator station for a variable speed drive

 

Table 1 shows the I/O address assignment table for this example, while Figure 2 illustrates the connection diagram from the PLC to the VS drive’s terminal block (TB-1). The connection uses a contact output interface to switch the forward/reverse signal, since the common must be switched.

To activate the drive, terminal TB-1-6 must receive 115 VAC to turn ON the internal relay CR1. The drive terminal block TB-1-8 supplies power to the PLC’s L1 connection to turn the drive ON. The output of the module (CR1) is connected to terminal TB-1-6. The drive’s 115 VAC signal is used to control the motor speed so that the signal is in the same circuit as the drive, avoiding the possibility of having different commons (L2) in the drive (the start/stop common is not the same as the controller’s common).

In this configuration, the motor’s overload contacts are wired to terminals TB-1-9 and TB-1-10, which are the drive’s power (L1) connection and the output interface’s L1 connection. If an overload occurs, the drive will turn OFF because the drive’s CR1 contact will not receive power from the output module.

This configuration, however, does not provide low-voltage protection, since thedrive and motor will start immediately after the overloads cool off and reclose.

To have low-voltage protection, the auxiliary contact from the drive, CR1 in terminal TB-1-7, must be used as an input in the PLC, so that it seals the start/stop circuit.

 

 

Table 1 - I/O address assignment

 

 

Figure 2 - Connection diagram from the PLC to the VS drive’s terminal block.

Figure 3 shows the PLC ladder program that will replace the manual operator station. The forward and reverse inputs are interlocked, so only one of them can be ON at any given time (i.e., they are mutually exclusive).

If the jog setting is selected, the motor will run at the speed set by the analog output when the start push button is depressed. The analog output connection simply allows the output to be enabled when the drive starts. Register 4000 holds the value in counts for the analog output to the drive. Internal 1000, which is used in the block transfer, indicates the completion of the instruction.

Sometimes, a VS drive requires the ability to run under automatic or manual control (AUTO/MAN). Several additional hardwired connections must be made to implement this dual control.

 

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Figure 3 - PLC implementation of the VS drive

 

The simplest and least expensive way to do this is with a selector switch (e.g., a four-pole, single-throw, single-break selector switch). With this switch, the user can select either the automatic or manual option. Figure 4 illustrates this connection.

Note that the start, stop, run/jog, potentiometer, and forward/reverse field devices shown are from the operator station. These devices are connected to the PLC interface under the same names that are used in the control program (refer to Figure 3).

If the AUTO/MAN switch is set to automatic, the PLC will control the drive; if the switch is set to manual, the manual station will control the drive.

 

Figure 4 - VS drive with AUTO/MAN capability

 

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