GE Multilin
G30 Generator Protection System
5-107
5 SETTINGS
5.4 SYSTEM SETUP
5
This section describes the algorithms in the relay that perform this compensation and produce the required calculated
quantities for transformer differential protection, by means of the following example of a delta-wye (
Δ
-Y) connected power
transformer with the following data:
The abbreviated nomenclature for applicable relay settings is as follows:
Rotation
=
SETTINGS
SYSTEM SETUP
POWER SYSTEM
PHASE ROTATION
w
total
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
GENERAL
NUMBER OF WINDINGS
Compensation
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
GENERAL
PHASE COMPENSATION
Source [
w
]
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
WINDING w
WINDING w SOURCE
P
rated
[
w
]
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
WINDING w
WINDING w RATED MVA
V
nominal
[
w
]
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
WINDING w
WINDING w NOM
Φ−Φ
VOLTAGE
Connection [
w
]
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
WINDING w
WINDING w CONNECTION
Grounding [
w
]
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
WINDING w
WINDING w GROUNDING
Φ
[
w
]
=
SETTINGS
SYSTEM SETUP
TRANSFORMER
WINDING w
WINDING w ANGLE WRT WINDING 1
CT primary
[
w
]
= the phase CT primary associated with Source [
w
]
Note that
w
= winding number, 1 to
w
total
The following
transformer setup rules
must be observed:
1.
The angle for the first winding from the transformer setup must be 0° and the angles for the following windings must be
entered as negative (lagging) with respect to (WRT) the winding 1 angle.
2.
The “Within zone” and “Not within zone” setting values refer to whether the winding is grounded. Select “Within zone” if
a neutral of a wye type winding, or a corner of a delta winding, is grounded within the zone, or whenever a grounding
transformer falls into the zone of protection.
d) PHASE RELATIONSHIPS OF THREE-PHASE TRANSFORMERS
Power transformers that are built in accordance with ANSI and IEC standards are required to identify winding terminals and
phase relationships among the windings of the transformer.
ANSI standard C.37.12.70 requires that the terminal labels include the characters 1, 2, 3 to represent the names of the indi-
vidual phases. The phase relationship among the windings must be shown as a phasor diagram on the nameplate, with the
winding terminals clearly labeled. This standard specifically states that the phase relationships are established for a condi-
tion where the source phase sequence of 1-2-3 is connected to transformer windings labeled 1, 2 and 3 respectively.
IEC standard 60076-1 (1993) states that the terminal markings of the three phases follow national practice. The phase rela-
tionship among the windings is shown as a specified notation on the nameplate, and there may be a phasor diagram. In this
standard the arbitrary labeling of the windings is shown as I, II and III. This standard specifically states that the phase rela-
tionships are established for a condition where a source phase sequence of I-II-III is connected to transformer windings
labeled I, II and III respectively.
The reason the source phase sequence must be stated when describing the winding phase relationships is that these rela-
tionships change when the phase sequence changes. The example shown below shows why this happens, using a trans-
former described in IEC nomenclature as a type “Yd1” or in GE Multilin nomenclature as a “Y/d30.”
Table 5–13: EXAMPLE DELTA-WYE CONNECTED POWER TRANSFORMER DATA
DATA
WINDING 1
Δ
(DELTA) CONNECTION
WINDING 2
Y (WYE) CONNECTION
Voltage Phasor Diagram
Phase Shift
0°
30° lag (i.e. phases of wye winding lag
corresponding phases of delta winding by 30°)
Grounding
In-zone grounding bank
Ungrounded
Rated MVA
100/133/166 MVA
100/133/166 MVA
Nominal
φ
-
φ
Voltage
220 kV
69 kV
CT Connection
Wye
Wye
CT Ratio
500/5
1500/5
Auxiliary Cooling
Two stages of forced air
Two stages of forced air
Содержание G30
Страница 10: ...x G30 Generator Protection System GE Multilin TABLE OF CONTENTS ...
Страница 30: ...1 20 G30 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 414: ...5 274 G30 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 456: ...8 2 G30 Generator Protection System GE Multilin 8 1 DIRECTIONAL PRINCIPLE 8 THEORY OF OPERATION 8 ...
Страница 470: ...9 14 G30 Generator Protection System GE Multilin 9 1 SETTING EXAMPLE 9 APPLICATION OF SETTINGS 9 ...
Страница 484: ...11 12 G30 Generator Protection System GE Multilin 11 6 DISPOSAL 11 MAINTENANCE 11 ...
Страница 512: ...A 28 G30 Generator Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 620: ...B 108 G30 Generator Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 666: ...E 10 G30 Generator Protection System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Страница 678: ...F 12 G30 Generator Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Страница 687: ...GE Multilin G30 Generator Protection System H 7 APPENDIX H H 2 ABBREVIATIONS H Z Impedance Zone ...