Site Test Report Ng-Sa Name of Substation: Dammam Housing 115/13.8KV Substation # 1
Site Test Report Ng-Sa Name of Substation: Dammam Housing 115/13.8KV Substation # 1
Site Test Report Ng-Sa Name of Substation: Dammam Housing 115/13.8KV Substation # 1
Customer:
Contractor’s name:
AL FANAR.
NG-SA
CT Ratio of HV Side
Panel No.
______
ELECTRICAL TEST
DATE:
TESTING ENGINEER CSD- Engineer
DC voltage (V) DC current w/o fault DC current with Max. calculated watt (W)
(mA) fault(mA)
+
-
Limit: DC burden 50 watts. (Refer to the reference technical manual page 391).
Supply OFF
TERMINALS (CLOSED) - (X11:2,X11:3) :
TERMINALS (OPEN) - :( X11:2 X11:1) :
SUPPLY ON
TERMINALS (CLOSED) - :( X11:1, X11:2) :
TERMINALS (OPEN) - (X11:3, X11:2) :
To check time &date go to main menu on the display for RET670 then system time
and adjust time &date.
To test this, remove the auxiliary supply from the relay for approximately 30 seconds,
then restoring the auxiliary supply, the time and date should be correct.
Result: ____________
DATE:
TESTING ENGINEER CSD- Engineer
CT Data:
CT 1 ( HV ) CT 2 ( LV ) CT 3 (Tertiary.)
Connection Type Y y
Primary Current ( A ) 300 3000
Secondary Current (A ) 1 1
DATE:
TESTING ENGINEER CSD- Engineer
Where
1. is Differential Current
2. is Differential Current Contribution from W1 side
3. is Differential Current Contribution from W2 side
4. is Differential Current Contribution from W3 side
A, B, C is a coefficients depended on vector group; refer to Manual to get exact value.
1.5.Secondary Injection Tests: (All Values as an example)
CH 4-I W1 CT IN
CH 5-I W2 CT IN
CH 6-I W2 CT IL1
CH 7-I W2 CT IL2
CH 8-I W2 CT IL3
CH 9-I Spare
CH 10-U W1 VT Ph-R
CH 11-U W1 VT Ph-R
CH 12-U W1 VT Ph-R
DATE:
TESTING ENGINEER CSD- Engineer
CH 6-I Spare
CH 7-U Spare
CH 8-U Spare
CH 9-U Spare
CH 10-U Spare
CH 11-U Spare
CH 12-U Spare
Apply equation at page 3 the Diff. Eq. for single phase injection, 2 winding
will be:
HV Winding
DATE:
TESTING ENGINEER CSD- Engineer
0.3 0.262
0.5 0.437
0.1 0.087
B 0.3 0.262
0.5 0.437
LV Winding
Measured Value Drop Out Operating Time @
Id min.
Calculated (A) Pickup 2X
Phase Set Value
value ( A ) Pick up Drop out Ratio I pickup (ms)
0.1 0.084
R 0.3 0.251
0.5 0.418
0.1 0.084
Y 0.3 0.251
0.5 0.418
0.1 0.084
B 0.3 0.251
0.5 0.418
Limits: Pick up & Drop Out ±2% of Ir for I < Ir or ±2% of I for I > Ir, Reset
Ratio > 95%,
Timing tolerance Typically 25 ms for 2 Id, and 12 ms for 5 Id for
unrestrained function ,
According to the Catalogue for Technical Data Page: 143
H.V Winding
DATE:
TESTING ENGINEER CSD- Engineer
Measured Value
Drop Out Operating Time
(A)
Phase Set Value Calculated Pickup @ 5X
value ( A ) Ratio I pickup (ms)
Pick up Drop out
2.00 1.754
R 3.00 2.631
5.00 4.385
2.00 1.754
Y 3.00 2.631
5.00 4.385
2.00 1.754
B 3.00 2.631
5.00 4.385
L.V Winding
DATE:
TESTING ENGINEER CSD- Engineer
5.00 4.195
Inject H.V and L.V phase with equal current on each, and angle 0 for H.V
and 180 for L.V, then decrease L.V Phase until trip, while leave H.V with
fixed current which will be the bias current, and record values and check
that corresponds to following equation.
DATE:
TESTING ENGINEER CSD- Engineer
DATE:
TESTING ENGINEER CSD- Engineer
Repeat the test and check the result with the following equation;
When bias current is more than:
Ibias ≥ End section2
DATE:
TESTING ENGINEER CSD- Engineer
Idmin = 0.3 Ib
I1 ( F =60 Hz ) I2 ( F = 120 Hz )
Phase I2 / I1 ratio %
(Pickup Value) Expected Blocking Measured
R 10 0.300 0.030
Y 50 0.300 0.150
B 100 0.300 0.300
I5 ( F = 300 Hz )
Phase I5 / I1 ratio % I1 ( F =60 Hz )
Expected Blocking Measured
R 15 0.300 0.045
Y 30 0.300 0.090
B 50 0.300 0.150
Cross Cross
Winding IR IY IB
Block on Block Off
DATE:
TESTING ENGINEER CSD- Engineer
1.5.8.SOTF test:
This function used when energized the transformer with internal fault.
where it use current gap principle to overridden all harmonic and waveform
block and trip quickly.
To test it , enable SOTF function and inject phase with harmonic and
current over pickup value …. at two condition :
a) Direct injection expected : Trip Status ___________
st
b) 2 stage , 1 state normal load without trip ( note you must inject from
both side H.V and L.V to simulate the normal load ) and 2 nd state with value
over pickup and have a 2nd harmonic over I2/I1 setting .
Expected: Block Status ___________
a. IminNegSeq test :
DATE:
TESTING ENGINEER CSD- Engineer
IMinNegSeq setting IH.V ( > IMinNegSeq setting ) (A) Expected IL..V (A) Measured IL..V (A)
0.04 0.11 0.100
0.08 0.22 0.201
0.10 0.27 0.252
Neg.Seq.ROA Expected IL..V angle for operating Measured IL..V angle for
setting zone (Deg) operating zone (Deg)
30 330 – 30
40 320 – 40
80 280 – 80
DATE:
TESTING ENGINEER CSD- Engineer
Status ____________________
Any start signal activate that function (i.e function independent on start
signal ), where if the fault discriminate as internal fault then remove any
harmonic which block relay and trip quickly , And if fault discriminate as
external fault. Then if the signal is polluted with harmonics this will block
relay else request trip.
Internal fault action (Expected: Trip): _____________
External fault (with harmonics) action (Expected: Block) :
External fault (without harmonics) action (Expected: Trip):
Rated Voltage W1
Rated Voltage W2
Rated Voltage W3
Rated Current W1
Rated Current W2
W1 Connection Type
W2 Connection Type
W3 Connection Type
W2 Clock Number
W3 Clock Number
ZS CurrSubtr W1
ZS CurrSubtr W2
ZS CurrSubtr W3
T configuration of W1
DATE:
TESTING ENGINEER CSD- Engineer
CT1 Rating W1
CT2 Rating W1
T configuration of W2
CT1 Rating W2
CT2 Rating W2
Idmin:
End section1:
End section2:
Slope section2:
Slope section3:
Id Unre:
I2/I1 Ratio:
I5/I1 Ratio:
Idiff Alarm:
tAlarm delay:
Op Neg. Seq. Diff
I min Neg. Seq.
Neg Sequence ROA
SOTF
Cross Blocking
1.6.1. PICK UP & DROP OFF TEST FOR DIFFERENTIAL CURRENT (Id):
From eq. at page 2 the Diff. Eq. for single phase injection, 2 windge will be:
DATE:
TESTING ENGINEER CSD- Engineer
LV Winding
Drop Out Operating Time
Id min. Calculated Measured Value
Phase PickUp @ 2X
Set Value value
Pick up Drop out Ratio I pickup (ms)
R
Y
B
Limits: Pick up & Drop Out ±2% of Ir for I < Ir or ±2% of I for I > Ir, Reset
Ratio > 95%,
Timing tolerance Typically 25 ms, According to the Catalogue for
Technical Data Page: 143
Pick-up & Drop-off Test for Unrestrained Differential Current (Id):
HV winding
DATE:
TESTING ENGINEER CSD- Engineer
LV Winding
Limits: Pick up & Drop Out ±2% of Ir for I < Ir or ±2% of I for I > Ir, Reset
Ratio > 95%,
Timing tolerance Typically 25 ms, According to the Catalogue for
Technical Data Page: 143
Section 1
When bias current is between:
0 ≤ Ibias ≤ Endsection1
DATE:
TESTING ENGINEER CSD- Engineer
Idmin
SLOPE Section3
DATE:
TESTING ENGINEER CSD- Engineer
I1 ( F =60 Hz ) I2 ( F = 120 Hz )
Phase I2 / I1 ratio %
(Pickup Value) Expected Blocking Measured
R
Y
B
I5 ( F = 300 Hz )
Phase I5 / I1 ratio % I1 ( F =60 Hz )
Expected Blocking Measured
R
Y
B
DATE:
TESTING ENGINEER CSD- Engineer
Inject H.V with angle zero degree and change the L.V to get the operating
zone.
NegSeqROA Expected IL..V angle for Measured IL..V angle for operating
setting operating zone (Deg) zone (Deg)
DATE:
TESTING ENGINEER CSD- Engineer
DATE:
TESTING ENGINEER CSD- Engineer