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Multiphase transformers can represent either a 1, 2, or 3-phase transformer. In the corresponding Excel tab, there are columns for declaration of up to 6 connection points (3 for Winding From end and 3 for Winding To end).

The sending and receiving connection points must be filled in correspondingly:

  • For example, if Winding From/Bus 1 is filled, Winding To/Bus 1 must be filled as well.
  • The unused connection points can be left empty. However, these empty fields must be located immediately after any completed connection point.
    For example, data in which Winding From/Bus 2 and Winding To/Bus 2 fields are filled out but Winding From/Bus 1 and Winding To/Bus 1 are empty is not valid and it causes an error.

Finally, the sending and receiving points can be connected to different phases. For example, Winding From/Bus 1 can be connected to phase A while Winding To/Bus 1 is connected to phase B.

In summary:

To represent a ...Fill these columns to add connection points...

single-phase transformer

Only Winding From/Bus 1 and Winding To/Bus 1 columns.

two-phase transformer

The Winding From/Bus1 and Winding From/Bus 2 as well as Winding To/Bus 1 and Winding To/Bus 2.

three-phase transformer

The Winding From/Bus1, Winding From/Bus 2, Winding From/Bus 3 as well as Winding To/Bus 1, Winding To/Bus 2 and Winding To/Bus 3.

Multiphase 2W Transformer

Symbol

Description

Unit

IDTransformer nameunique name

Status

Connect/Disconnect status

Initial value 1 (0 for disconnected)

Number of PhasesPhase count in use1, 2, or 3

Winding From

Bus1

Primary side: Bus 1

a unique name

Bus2

Primary side: Bus 2

a unique name

Bus3

Primary side: Bus 3

a unique name

V (kV)

Primary winding nominal voltage (phase-to-phase)

kV

S_base (kVA)

Nominal power in primary side

kVA

Conn. type (*)

Primary winding connection type

‘wye’ and ‘delta’

Winding To

Bus1

Secondary side: Bus 1

a unique name

Bus2

Secondary side: Bus 2

a unique name

Bus3

Secondary side: Bus 3

a unique name

V (kV)

Secondary winding nominal voltage (phase-to-phase)

kV

S_base (kVA)

Nominal power in secondary side

NOT APPLICABLE

Conn. type (*)

Secondary winding connection type

‘wye’ and ‘delta’

Tap 1

Initial tap position: winding 1

Integer between Lowest and Highest Tap

Tap 2

Initial tap position: winding 2

Tap 3

Initial tap position: winding 3

Lowest Tap

The lowest tap position

Integer value

Highest Tap

The highest tap position

Integer value

Min Range (%)

Max voltage buck

0 < value < 100

Max Range (%)

Max voltage boost

value > 0

X (pu)

Total reactance

p.u.

Rw1 (p.u.)Primary winding resistancep.u.
Rw2 (p.u.)Secondary winding resistancep.u.

Multiphase 2W Transformer with Mutual Impedance

Symbol

Description

Unit

IDTransformer namea unique name

Status

Connect/Disconnect status

Initial value 1 (0 for disconnected)

Number of PhasesPhase count in use1, 2, or 3

Winding From

Bus1

Primary side: Bus 1

a unique name

Bus2

Primary side: Bus 2

a unique name

Bus3

Primary side: Bus 3

a unique name

V (kV)

Primary winding nominal voltage (phase-to-phase)

kV

S_base (kVA)

Nominal power in primary side

kVA

Conn. type (*)

Primary winding connection type

‘wye’ and ‘delta’

Winding To

Bus1

Secondary side: Bus 1

a unique name

Bus2

Secondary side: Bus 2

a unique name

Bus3

Secondary side: Bus 3

a unique name

V (kV)

Secondary winding nominal voltage (phase-to-phase)

kV

S_base (kVA)

Nominal power in secondary side

NOT APPLICABLE

Conn. type (*)

Secondary winding connection type

‘wye’ and ‘delta’

Tap 1

Initial tap position: winding 1

Integer between Lowest and Highest Tap

Tap 2

Initial tap position: winding 2

Tap 3

Initial tap position: winding 3

Lowest Tap

The lowest tap position

Integer value

Highest Tap

The highest tap position

Integer value

Min Range (%)

Max voltage buck

0 < value < 100

Max Range (%)

Max voltage boost

value > 0

Z0 leakage (pu)

Zero-sequence impedance

transformer p.u.

Z1 leakage (pu)

Positive-sequence impedance

transformer p.u.

X0/R0

Zero-sequence reactance to resistance ratio

ratio

X1/R1

Positive-sequence reactance to resistance ratio

ratio

No Load Loss (kW)

No-load power loss

NOT APPLICABLE


Note: (*) Four types of winding configurations are supported: 'DD0', 'YgYg0', 'DYg1', 'YgD1'.


Available I/O Pins

No

Pin Description

Pin Type

Value/Unit

Instruction

1

Get sending end current magnitude of wire j

O

A (RMS)

transformerID/ImagFromj

where j is 1, 2 or 3

2

Get receiving end current magnitude of wire j

O

A (RMS)

transformerID/ImagToj

where j is 1, 2 or 3

3

Get sending end current angle of wire j

O

Degree

transformerID/IangFromj

where j is 1, 2 or 3

4

Get receiving end current angle of wire j

O

Degree

transformerID/IangToj

where j is 1, 2 or 3

5

Set/Get tap position

I/O

Integer between [min_tap, max_tap]

transformerID/tap_j

where j is 1, 2 or 3

Example

See the Transformer page in phasor08_IEEE13.xls file in demo PHASOR-08.

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