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RARF Frequently Asked Questions from
Resource Entities
Ed Geer
RARF Workshop III
8/29/2013
Questions about Data Items – UNIT Info tab
• Q: What is our Point of Interconnection – Substation Code?
A: Generally, the substation where Resource Entity equipment
connects to TSP equipment.
• Q: What are the acceptable ranges for Governor Droop Setting and
Dead-band?
A: Governor Droop Setting >= 0.02 and <= 0.05
Governor Dead-band <= 0.036
• Q: What do we enter for Governor Droop Setting and Dead-band if
our resource is exempted from providing governor response, or
is a WGR currently in PRR833 ADR?
A: Enter Governor Droop Setting of 5% (entered as 0.05) and
Governor Dead-Band of 1 Hz.
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Questions about Data Items – Reactive Capability tab
•
Q: What needs to be entered on the Reactive Capability tab?
A: The actual gross leading and lagging reactive capability of the
resource, specified at four MW output levels covering the full
range of operation.
•
Q: Should substation capacitors, reactors or other reactive devices be
reflected in the Reactive Capability tab?
A: No; substation capacitors, reactors or other reactive devices are
modeled separately and are NOT included in the Reactive
Capability tab. Enter the substation capacitors, reactors on the
Capacitor and Reactor Data tab and dynamic reactive devices on
the Static_Var_Compensator Data tab.
•
Q: Where can we find more information about Resource Reactive
Capability and Reactive Testing?
A: Refer to the presentation posted with the June 14, 2013 Reactive
Testing Workshop.
RARF Workshop III
8/29/2013
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Questions about Data Items – Planning tab
• Q: What is needed for Positive Sequence Reactance?
A: Synchronous Reactance – Xdi (unsaturated) and Xdv (saturated)
• Q: What sites need Collector System one-lines and collector system
data?
A: Currently only the Wind RARF has tabs for submitting Collector
System one-lines and Collector system data. Future RARF
form updates will add forms and tabs for Solar and
Battery/Storage resources.
• Q: What is meant by “Zero Sequence Grounding Resistance For An
Impedance Grounded Generator In P.u. (100 MVA Base)”
A: The grounding of the generator through a resistor or reactance
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8/29/2013
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Questions about Data Items – Transformer Data tab
•
Q: Do we need to change the RARF to reflect that we have a 3 -winding transformer?
A: Case 1: No, if you have a buried tertiary or no connections to the tertiary
winding, only enter Zero Sequence Data - Winding Connection Code =5.
(Transformer Test Report must be submitted with RARF)
Case 2: Yes, if you have a modeled generator, device or load
connected to the tertiary or additional secondary winding
(Transformer Test Report submitted with RARF)
•
Q: Do we need to complete the Transformer Tap Settings tab for each transformer
A: Yes, we need the high side and low side taps, if they exist. You would have
one row on the spreadsheet for high side and one row for low side taps. For
more information about transformer taps as modeled by ERCOT, please refer
to the Key Documents posted for the August 9, 2011 Transmission Model
Workshop.
•
Q: What is meant by “Zero Sequence Grounding Resistance For An Impedance
Grounded Transformer In P.u. (100 MVA Base)”
A: The grounding of the transformer – if solidly grounded wye, then enter 0.0 for
Grounding Resistance and Reactance. If ungrounded wye, enter 99999.0 for
Grounding Resistance and Reactance. If wye grounded through a
resistance or reactance, enter those values in per unit on 100 MVA base.
RARF Workshop III
8/29/2013
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Questions about Data Items – Transformer Data tab
• Q: Can we use the positive sequence reactance for the transformer
for the zero sequence reactance?
A: Generally, the zero sequence reactance will be less than the
positive sequence reactance, for example for core form
transformers (Transformer Test Report submitted with RARF).
RARF Workshop III
8/29/2013
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Questions about Data Items – Transformer Data tab
• Q: What are valid codes for the Zero Sequence Data - Winding
Connection Code?
A: Taken from Jay Teixeira’s October 29, 2012 RARF Workshop II
presentation Item #6.
Transformer Connection Codes
2 Winding Transformers (in order of voltage highest first)
1 Wye - Wye Bank Both Neutrals Grounded
2 Wye - Delta Bank Grounded Y
3 Delta - Wye Bank Grounded Wye
Delta - Delta Bank
Wye - Delta Bank Ungrounded Wye
Delta - Wye Bank Ungrounded Wye
4 Wye - Wye Bank Either Wye Ungrounded
5 Three Winding only
RARF Workshop III
8/29/2013
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Questions about Data Items – Line Data tab
• Q: What is Planning Rate C for a line?
A: The conductor 2 hour rating. Per Protocols:
Conductor/Transformer 2-Hour Rating
The two-hour MVA rating of the conductor or transformer only, excluding substation
terminal equipment in series with a conductor or transformer, at the applicable
ambient temperature. The conductor or transformer can operate at this rating for two
hours without violation of National Electrical Safety Code (NESC) clearances or
equipment failure.
RARF Workshop III
8/29/2013
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Questions about RARF Submission
• Q: Why do we need to submit all the embedded files (Dynamic Data,
site one-lines, collector system one-lines) and attached files
(Transformer Reports) every time we submit a RARF update?
A: The files must be embedded or attached with each submittal
because we don’t have an incremental update system – ALL
RARF data is submitted on each RARF update. Each RARF
submittal must be a complete stand-alone package (zip file with
all forms and associated files).
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Additional Questions?
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