IEEE PSAP PTI data format

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Partial Description of the IEEE Common Data Format for the   
Exchange of Solved Load Flow Data
6 a: h$ [" Q3 f0 B8 ?' P: rThe complete description can be found in the paper "Common Data
Format for the Exchange of Solved Load Flow Data", Working Group on a
! ]1 K$ z. A" u% cCommon Format for the Exchange of Solved Load Flow Data, _IEEE
4 q% p/ s% P6 B* d" XTransactions on Power Apparatus and Systems_, Vol. PAS-92, No. 6,
; G3 Z' W5 b9 HNovember/December 1973, pp. 1916-1925.
The data file has lines of up to 128 characters. The lines are grouped
. k9 A) H! @- r. sinto sections with section headers. Data items are entered in specific
columns. No blank items are allowed, enter zeros instead. Floating point
items should have explicit decimal point. No implicit decimal points
are used.
; a/ ^. v" b- A8 N$ z* uData type codes: A - Alphanumeric (no special characters)
                 I - Integer
' U/ |4 S8 m& j  G0 k  P                 F - Floating point
                 * - Mandatory item
3 V  Q8 v% g# Q- H, kTitle Data
) ^$ P3 r- K1 m5 s==========
3 {  ~" K) ~2 W( [+ j% MFirst card in file.
% c' v4 Y- u) w7 m( FColumns  2- 9   Date, in format DD/MM/YY with leading zeros. If no date
                provided, use 0b/0b/0b where b is blank.
; Y8 w) ]+ w2 L- l9 YColumns 11-30   Originator's name (A)
Columns 32-37   MVA Base (F*)
4 `8 [" F! o+ _Columns 39-42   Year (I)
+ W% L* B5 l, r) o; N0 [) k  `# hColumn  44      Season (S - Summer, W - Winter)
Column  46-73   Case identification (A)
) f, d% W9 w3 S1 [" a1 J# |Bus Data *
==========
) ~& o$ k/ H) ESection start card *:
8 D6 f! a( m7 G---------------------
Columns  1-16   BUS DATA FOLLOWS (not clear that any more than BUS in
                1-3 is significant) *
8 J  C3 r- t3 j" e* K/ [Columns  ?- ?   NNNNN ITEMS (column not clear, I would not count on this)
5 x2 S; k- l9 N$ ~% @Bus data cards *:
9 F  _1 @. f( ^' X+ I) z; u-----------------
Columns  1- 4   Bus number (I) *
Columns  7-17   Name (A) (left justify) *
Columns 19-20   Load flow area number (I) Don't use zero! *
6 [" Y% U; C2 Q; NColumns 21-23   Loss zone number (I)
Columns 25-26   Type (I) *
                 0 - Unregulated (load, PQ)
! P- v# T/ Y5 ^8 n# p7 R                 1 - Hold MVAR generation within voltage limits, (PQ)
$ G/ \- E0 t9 O1 S: y  v                 2 - Hold voltage within VAR limits (gen, PV)
) v& |( V2 s4 p4 u9 {: f9 w0 h8 C                 3 - Hold voltage and angle (swing, V-Theta) (must always
4 S6 z& J. m$ n7 w3 l+ |- g# V                      have one)
Columns 28-33   Final voltage, p.u. (F) *
Columns 34-40   Final angle, degrees (F) *
Columns 41-49   Load MW (F) *
9 G. V) w: F# b. b2 S5 UColumns 50-59   Load MVAR (F) *
+ H& W( t1 h0 FColumns 60-67   Generation MW (F) *
Columns 68-75   Generation MVAR (F) *
Columns 77-83   Base KV (F)
Columns 85-90   Desired volts (pu) (F) (This is desired remote voltage if
5 d# N5 y. g2 v6 N                this bus is controlling another bus.
9 B$ M) s5 u$ |- y! `+ Z; hColumns 91-98   Maximum MVAR or voltage limit (F)
Columns 99-106  Minimum MVAR or voltage limit (F)
( R; e( B1 ^/ Z; TColumns 107-114 Shunt conductance G (per unit) (F) *
Columns 115-122 Shunt susceptance B (per unit) (F) *
Columns 124-127 Remote controlled bus number
Section end card:
0 }+ D- a2 Z$ v" E1 l  N-----------------
6 `7 j0 z+ u- x5 z* u$ oColumns  1- 4   -999
4 O8 I+ k8 M1 B% G6 qBranch Data *
=============
' i  K) _) @6 ySection start card *:
+ f# V+ \1 w: X& ^- \& n% D---------------------
7 G# ?& }+ w; T$ L. K2 R8 W4 I& K/ O+ PColumns  1-16   BRANCH DATA FOLLOWS (not clear that any more than BRANCH
                is significant) *
9 A) v" d9 F2 P! CColumns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
0 e' Y0 d  l1 j/ M& TBranch data cards *:
  b# x3 b% g1 f. E# o$ w--------------------
Columns  1- 4   Tap bus number (I) *
, O$ {9 U# g, f                 For transformers or phase shifters, the side of the model
                 the non-unity tap is on
Columns  6- 9   Z bus number (I) *
- w/ x0 y$ b5 t# s2 t. ?' ^                 For transformers and phase shifters, the side of the model
                 the device impedance is on.
; R+ F2 E* F$ I4 Y! U# v8 ^Columns 11-12   Load flow area (I)
$ |& a6 m) ]! s9 V0 j  rColumns 13-14   Loss zone (I)
Column  17      Circuit (I) * (Use 1 for single lines)
: o$ f) o& a5 h- EColumn  19      Type (I) *
4 i2 ~4 I% Q' Q+ J                 0 - Transmission line
                 1 - Fixed tap
/ E8 i% G4 z( W" k; o" f4 g                 2 - Variable tap for voltage control (TCUL, LTC)
& s* i3 G: b( ?) f; v3 X                 3 - Variable tap (turns ratio) for MVAR control
                 4 - Variable phase angle for MW control (phase shifter)
Columns 20-29   Branch resistance R, per unit (F) *
- N- q0 ?$ f6 c& ~& j" kColumns 30-40   Branch reactance X, per unit (F) * No zero impedance lines
' I2 Z0 E1 p3 \  W- @5 dColumns 41-50   Line charging B, per unit (F) * (total line charging, +B)
, X& K8 D- }9 Y4 U& R, CColumns 51-55   Line MVA rating No 1 (I) Left justify!
Columns 57-61   Line MVA rating No 2 (I) Left justify!
1 r3 U# h( c. u, O" A. C! o1 ?Columns 63-67   Line MVA rating No 3 (I) Left justify!
Columns 69-72   Control bus number
+ E( J+ r6 O* R4 x9 RColumn  74      Side (I)
                 0 - Controlled bus is one of the terminals
% G6 i+ Z3 h7 W0 U- B                 1 - Controlled bus is near the tap side
                 2 - Controlled bus is near the impedance side (Z bus)
2 G3 ^6 t2 B3 l7 J; KColumns 77-82   Transformer final turns ratio (F)
8 @, L8 @9 x1 g' e1 w, p/ YColumns 84-90   Transformer (phase shifter) final angle (F)
Columns 91-97   Minimum tap or phase shift (F)
9 b# F; r+ H  M) TColumns 98-104  Maximum tap or phase shift (F)
Columns 106-111 Step size (F)
9 B* r9 C  Q7 }; iColumns 113-119 Minimum voltage, MVAR or MW limit (F)
" `, I, X1 k) Y8 P2 Y: _2 [0 R, jColumns 120-126 Maximum voltage, MVAR or MW limit (F)
: p2 {2 q7 R% NSection end card:
8 ^8 j" [& ~$ u-----------------
Columns  1- 4   -999
# G3 l* H9 G  K( v, m4 }6 _! PLoss Zone Data
- I$ x, }9 t# @! B, x1 N; h& g0 _==============
Section start card
  z9 ^. g7 g5 N------------------
Columns  1-16   LOSS ZONES FOLLOWS (not clear that any more than LOSS
                is significant)
' {% s# Z1 n8 b( x+ {; q2 ~5 OColumns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
Loss Zone Cards:
  ?& O. M8 Y1 M2 y5 A----------------
4 n" S# B. @, t- u" }6 L4 }1 [Columns  1- 3   Loss zone number  (I)
! q/ K7 l+ K) V9 ?. }Columns  5-16   Loss zone name (A)
+ h/ h, n6 Z! {: H1 zSection end card:
0 I5 n6 a0 {$ X: `! v7 I4 j0 b-----------------
Columns  1- 3   -99
Interchange Data *
8 ^9 @, K" X+ X, c8 H" l/ g/ N==================
% S6 e1 J) N& Z* l+ \  h5 E3 `$ \Section start card
------------------
' K! c& R3 M: u6 f5 BColumns  1-16   INTERCHANGE DATA FOLLOWS (not clear that any more than
                first word is significant).
! N' p, p# n! e+ IColumns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
Interchange Data Cards *:
3 A, P4 A0 ~$ n-------------------------
+ x, y# g( k& N/ nColumns  1- 2   Area number (I) no zeros! *
" ~$ I6 l3 i. z3 jColumns  4- 7   Interchange slack bus number (I) *
Columns  9-20   Alternate swing bus name (A)
Columns 21-28   Area interchange export, MW (F) (+ = out) *
Columns 30-35   Area interchange tolerance, MW (F) *
" x9 |, U$ ?8 @! [+ r* q" w. M5 z" mColumns 38-43   Area code (abbreviated name) (A) *
5 u: h( c4 `  i$ v: IColumns 46-75   Area name (A)
4 n4 P! J! ]) zSection end card:
" i- `; `/ B# p3 R+ I8 }  U7 \-----------------
3 c9 k1 ]# x' c# Z% D3 tColumns  1- 2   -9
2 f; |! b/ r* d% c0 t; I6 Y# BTie Line Data
=============
5 ?( r* c$ }, W+ u! X- X' tSection start card
7 U" H7 r3 T, K0 q: A! V9 n0 _------------------
Columns  1-16   TIE LINES FOLLOW (not clear that any more than TIE
, M" t% M2 n9 l; F( X. l                is significant)
' J; L2 ?) a, A' t. l5 CColumns 40?- ?  NNNNN ITEMS (column not clear, I would not count on this)
Tie Line Cards:
+ R8 b. @5 r( F$ `2 T9 n: `$ y5 G---------------
Columns  1- 4   Metered bus number (I)
Columns  7-8    Metered area number (I)
  o/ W/ o- Y! Y4 R% N" s* [% J- ^* kColumns  11-14  Non-metered bus number (I)
Columns  17-18  Non-metered area number (I)
1 q7 Q4 t" i% K. S, vColumn   21     Circuit number
* H$ C" }2 {8 kSection end card:
-----------------
. o: S  Y5 J+ e/ `; ~Columns  1- 3   -999
END OF DATA

& x; K: [6 t+ @. ?. dPSAP File Format
May 20, 1993
- ]5 ]: A% J4 ^7 W9 J9 MThe PECO PSAP File Format is fully described in the _PJM Power System
7 f4 G9 P, m/ E( u& @6 A' ^! UAnalysis Package Use's Guide_, available from the Philadelphia
Electric Company. The following is a rough description of the
) d" i+ o' E5 S; E0 R' K6 Wmost important parts of the format.
7 M% k- e; n9 s, ^9 }( R' o, nA PSAP data file is divided into sections by code cards. The code is
in the first three columns. There are something like 60 codes, of
which only four are described in this document.
The 1 code indicates that the next card is the case title. Only one
0 c0 t! z' t8 M3 E, `* _title is allowed per case.
The 4 card indicates that line data follows. The line data ends with
: h/ T+ B/ O% B: }8 Z$ fa 9999 card.
- K# @% _0 k7 A4 pThe 5 card indicates that bus data follows. The bus data ends with
a 9999 card.
! r* C2 T% j% U; ?. bThe 15 card indicates that area interchange data follows. The data ends with
a 9999 card.
Line Data Card (Code 4 cards)
=============================
Cols    Data
1-4     From bus number
6       Change code (blank in 4 section)
7       'C' if second card present for same line. Used for transformers.
9-12    To bus number
; L, \- C% |" g; J$ N14      Circuit number (blank in 4 section)
16      'T' or 'F' - Load flow area of bus at this end of line gets losses.
18-23   Line resistance in percent of base. (NOT per unit.)
        (percent = 100 x per unit) Two default decimal places.
24-29   Line reactance, in percent. Two default decimal places.
. L' Z0 m) J+ x; h30-35   Line charging MVAR (total). Three default decimal places.
36-40   Transformer tap (per unit turns ratio). Three default decimal
: u$ v+ l: k) H  a! `1 C        places, 1000 = 1.000.
# B1 D* w) V8 [/ ~- f  j0 V" F41-45   Min tap, for OLTC. Three default decimal places.
$ R# O+ l; D, e46-50   Max tap, for OLTC. Three default decimal places.
8 F. ?; V. N0 O! ~# f# ^# c51-55   Phase shift angle, for OL phase shifter. Two default decimal places.
56-60   Remote voltage control bus number. Negative if lower tap increases
. J2 p1 H! S' e, c, [' M        voltage of this bus.
, W1 h( Y' S3 J7 }! V  e* r: K/ Z; y61-64   Normal MVA rating
' B& L+ P  Q2 a- L7 C; n. \! M6 {65-68   Emergency MVA rating
- z9 i" q$ u- `& L! t. g7 U# k' ]69-72   MVA Base. Default value 100 MVA if blank.
6 R. @! o2 b' S* q# SSecond Line Card (follows 'C' in first card)
" S3 Q% u, E9 ]) x, F7 D============================================
$ v& U- Z. }* z  U1-17    Same as first card, except no 'C'. Can be left blank.
, K* I, X& b* t* N& z35-40   Desired MVAR flow or Min voltage setpoint for OLTC.
41-45   Min phase shifter degrees. Two default decimal places.
46-50   Max phase shifter degrees. Two default decimal places.
- V3 m" o+ J+ W51-55   Desired MW flow for phase shifter.
% s* P, e! T& X57-60   Controlled line from bus.
62-65   Controlled line to bus.
( o2 r; X" O2 T. _- r8 c67-70   Available taps (number of taps)
  j( B. [7 }0 l( _( w+ Y71-75   Maximum voltage setpoint. Three default decimal places.
/ [. V) k2 V" K1 t/ C. Y$ u+ IBus Cards (Code 5 cards)
========================
1-4     Bus number
, Z7 P- p/ j  e( r, Q( x9 T$ W4 t6       Change code (blank in 5 section)
7       Continue code (blank in 5 section)
/ n* `3 O" ?! F2 [8 |* v) G" E8       Regulated bus code:
* n# \" M% t* n/ s+ p         Blank - load (PQ) bus
8 W% U/ V$ @( |5 @; a5 w" \         1     - gen (PV) bus
         2     - swing (V-Theta) bus
10-21   Name
6 i4 s+ o3 f/ f. W% l- _0 u23-26   Bus voltage (control setpoint or solved value).
        Three default decimal places.
8 p/ p6 a! u0 l27-30   Bus angle
31-35   Generation MW
36-40   Generation MVAR (from solution)
# l! V- \: y$ e6 c" h# x$ i! I41-45   Generation MVAR low limit
46-50   Generation MVAR high limit
51-55   Bus at which generation controls voltage
) |5 u! i3 ]$ X/ Y56-60   Load MW
4 x0 w' {2 r+ U1 A0 A8 i61-65   Load MVAR
66-70   Shunt MVAR. Reactors are minus.
/ `: J6 A# G& m( P# l& b71-72   Load flow area. (Used for area interchange and losses).
Area Interchange Cards (Code 15 cards)
======================================
3-4     Load flow area number
5-8     Swing bus for area interchange. Adjusts generation at this bus
        to meet area interchange requirement.
9-14    Area exports, MW. (+ = out of area)
" S. q- x5 ]0 m3 {7 u15-19   Area Interchange tolerance, MW
20-55   Area name
! G7 Z, E! f" x7 L  m: o) ^$ ^$ c56-60   Area load (usually left blank)
" P$ O, i- h7 l+ s" @. F6 ~! l. q6 a61-65   Area losses (usually left blank)
8 D& x! z7 U5 ?
2 h. {$ q6 F; s9 z. l2 z# N

Description of the PTI Load Flow Data Format
============================================
Note that PTI reserves the right to change the format at any time.
3 V6 R; H7 f/ ^! a; Q3 h0 l0 C. `For use with the IEEE 300 bus test case in PTI format.
Case Identification Data
' t+ }8 @, `6 s========================
First record: IC,SBASE
  O8 \$ y. T/ j/ ?, [ IC - 0 for base case, 1 for change data to be added
SBASE - System MVA base
9 L+ R2 ?* m, Q& X3 ]( eRecords 2 and 3 - two lines of heading, up to 60 characters per line
2 I; N% b% _, r7 U* |$ cBus Data
========
Bus data records, terminated by a record with a bus number of zero.
& |9 j( n1 h1 c9 X' M! Y  J* fI,IDE,PL,QL,GL,BL,IA,VM,VA,'NAME',BASKL,ZONE
. @) v* ~2 c4 a I - Bus number (1 to 29997)
IDE - Bus type
  X. e. b4 z) B: T! ^( S        1 - Load bus (no generation)
        2 - Generator or plant bus
        3 - Swing bus
: C/ {# q) K7 r7 \        4 - Islolated bus
PL - Load MW
& ?0 ^* H9 Y% ?: G( o; B: j QL - Load MVAR
GL - Shunt conductance, MW at 1.0 per unit voltage
BL - Shunt susceptance, MVAR at 1.0 per unit voltage. (- = reactor)
9 N4 z! W( p( s" ?% g' w IA - Area number, 1-100
VM - Voltage magnitude, per unit
VA - Voltage angle, degrees
NAME - Bus name, 8 characters, must be enclosed in quotes
BASKV - Base voltage, KV
7 E- q7 N. c" F. e ZONE - Loss zone, 1-999
Generator Data
==============
Generator data records, terminated by a generator with an index of zero.
! y. M6 ^  @7 W6 ?! \3 f7 b' bI,ID,PG,QG,QT,QB,VS,IREG,MBASE,ZR,ZX,RT,XT,GTAP,STAT,RMPCT,PT,PB
I - Bus number
* u7 E% ^' W% o, \1 a* H8 MID - Machine identifier (0-9, A-Z)
, W8 \1 p- y$ [2 h$ pPG - MW output
# u' E5 k$ W* k8 B0 p4 P4 ~QG - MVAR output
QT - Max MVAR
QB - Min MVAR
VS - Voltage setpoint
IREG - Remote controlled bus index (must be type 1), zero to control own
voltage, and must be zero for gen at swing bus
1 l# B! R0 i- l/ [- H7 S3 [MBASE - Total MVA base of this machine (or machines), defaults to system
MVA base.
ZR,ZX - Machine impedance, pu on MBASE
RT,XT - Step up transformer impedance, p.u. on MBASE
3 H; f; f8 t4 p: MGTAP - Step up transformer off nominal turns ratio
8 Y, z  h4 n" R0 XSTAT - Machine status, 1 in service, 0 out of service
. ^7 K+ ~" H- V/ y! @RMPCT - Percent of total VARS required to hold voltage at bus IREG
to come from bus I - for remote buses controlled by several generators
PT - Max MW
# D/ y! N. E% i" S  CPB - Min MW
0 z1 v0 y9 A  E! M! ]9 JBranch Data
===========
Branch records, ending with a record with from bus of zero
I,J,CKT,R,X,B,RATEA,RATEB,RATEC,RATIO,ANGLE,GI,BI,GJ,BJ,ST
' k: a- A2 h: |2 WI - From bus number
J - To bus number
+ q. t( C* ]$ m/ ]/ aCKT - Circuit identifier (two character) not clear if integer or alpha
" {  T  K# n. o% ^R - Resistance, per unit
X - Reactance, per unit
B - Total line charging, per unit
RATEA - MVA rating A
RATEB, RATEC - Higher MVA ratings
0 {- L2 r, l0 e  L( N) `/ R& NRATIO - Transformer off nominal turns ratio
+ z/ F; z4 w( `3 c1 pANGLE - Transformer phase shift angle
GI,BI - Line shunt complex admittance for shunt at from end (I) bus, pu.
GJ,BJ - Line shunt complex admittance for shunt at to end (J) bus, pu.
/ U" U" `6 A* B3 ^" AST - Initial branch status, 1 - in service, 0 - out of service
Transformer Adjustment Data
===========================
Ends with record with from bus of zero
I,J,CKT,ICONT,RMA,RMI,VMA,VMI,STEP,TABLE
I - From bus number
J - To bus number
CKT - Circuit number
+ s, ?, Q$ U) x" R8 g. G5 `/ R0 R: |ICONT - Number of bus to control. If different from I or J, sign of ICONT
; K8 \) u- J$ ]! g* c: t- }4 w determines control. Positive sign, close to impedance (untapped) bus
1 j8 b* F* U  A2 C$ Z5 z" C/ i: X of transformer. Negative sign, opposite.
RMA - Upper limit of turns ratio or phase shift
RMI - Lower limit of turns ratio or phase shift
VMA - Upper limit of controlled volts, MW or MVAR
VMI - Lower limit of controlled volts, MW or MVAR
STEP - Turns ratio step increment
TABLE - Zero, or number of a transformer impedance correction table 1-5
1 i8 L- W; k7 `# t1 N% r- T- t. pArea Interchange Data
=====================
Ends with I of zero
I,ISW,PDES,PTOL,'ARNAM'
3 Q7 y' g; C/ o" b" C( cI - Area number (1-100)
* y, ?2 k8 V, g1 o0 x: ^8 z# X* sISW - Area interchange slack bus number
PDES - Desired net interchange, MW + = out.
PTOL - Area interchange tolerance, MW
ARNAM - Area name, 8 characters, enclosed in single quotes.
DC Line Data
============
8 Y; v' ?5 l: @& n* c/ sEnds with I of zero
+ B0 W* I* j) h3 x2 L1 s  zEach DC line has three consecutive records
1 M3 J, Q- A. s" D' DI,MDC,RDC,SETVL,VSCHD,VCMOD,RCOMP,DELTI,METER
& W5 b4 @- \0 }6 H. `: m" OIPR,NBR,ALFMAX,ALFMN,RCR,XCR,EBASR,TRR,TAPR,TPMXR,TPMNR,TSTPR
IPI,NBI,GAMMX,GAMMN,RCI,XCI,EBASI,TRI,TAPI,TPMXI,TPMNI,TSTPI
I - DC Line number
  F: A* I5 w1 U2 i8 b6 TMDC - Control mode 0 - blocked 1 - power 2 - current
4 U) C: @1 p& Q( NRDC - Resistance, ohms
SETVL - Current or power demand
VSCHD - Scheduled compunded DC voltage, KV
VCMOD - Mode switch DC voltage, KV, switch to current control mode below this
RCOMP - Compounding resistance, ohms
& e, i" }' y) [0 h' ^5 \, G" qDELTI - Current margin, per unit of desired current
METER - Metered end code, R - rectifier I - Inverter
) i5 q1 i; e6 c) u1 h: r: h" P* d8 ^IPR - Rectifier converter bus number
NBR - Number of birdges is series rectifier
; m  E; {! A) z1 F& D5 R4 {ALFMAX - Maximum rectifier firing angle, degrees
2 C* p+ z+ v0 n  s3 S3 SALFMN - Minimum rectifier firing angle, degrees
RCR - Rectifier commutating transformer resistance, per bridge, ohms
' b+ \8 F: Q; \* NXCR - Rectifier commutating transformer reactance, per bridge, ohms
% G& `: D3 L7 }+ a- B. mEBASR - Rectifier primary base AC volts, KV
TRR - Rectifier transformer ratio
- v9 U* l4 u2 F7 h; i  PTAPR - Rectifier tap setting
  |; a- ]2 v% f; {, y7 NTPMXR - Maximum rectifier tap setting
TPMNR - Minimum rectifier tap setting
( F& d0 ]5 i* c8 ^" l. R5 a' d# wTSTPR - Rectifier tap step
  |+ S3 Y: a9 t- `& u! zThird record contains inverter quantities corresponding to rectifier
/ X0 E6 Q7 E. Cquantities above.
Switch Shunt Data
=================
Ends with I = 0.
I,MODSW,VSWHI,VSWLO,SWREM,BINIT,N1,B1,N2,B2...N8,B8
I - Bus number
MODSW - Mode 0 - fixed 1 - discrete 2 - continuous
VSWHI - Desired voltage upper limit, per unit
VSWLO - Desired voltage lower limit, per unit
SWREM - Number of remote bus to control. 0 to control own bus.
1 j! i" e5 E3 u) @8 {1 |' @VDES - Desired voltage setpoint, per unit
BINIT - Initial switched shunt admittance, MVAR at 1.0 per unit volts
N1 - Number of steps for block 1, first 0 is end of blocks
B1 - Admittance increment of block 1 in MVAR at 1.0 per unit volts.
N2, B2, etc, as N1, B1

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