The document discusses constraints and contingency plans for several substations in Mindanao, Philippines. General Santos substation lacks transformer capacity for peak loads and has overheating issues with transformer T5. Business continuity plans include load shedding from SOCOTECO II if transformers trip. Long term plans include installing a new transformer and mobile transformer. Tacurong substation lacks equipment for newly installed transformer T4. Plans include using spare equipment and procuring new equipment. Kidapawan and Sultan Kudarat substations lack N-1 transformer redundancy, and plans discuss load transfers to address potential transformer or line outages.

2. DISTRICT 6
Mindanao Operations and Maintenance

3. TRANSFORMER
CONSTRAINTS

4. GENERAL SANTOS SUBSTATION
Constraints
 General Substation lacks Transformer N-1 contingency if
SOCOTECO II’s embedded Sarangani Energy
Corporation (SEC) is not in operation. The peak load of
the substation is already 160MW but the capacity is only 2
x 100MVA
 If one of the transformers trips during this situation, the
other one will be overloaded

5. GEN. SANTOS
SUBSTATION
(NGCP)
100 MVA T5
100 MVA T4
GLAN (Sari and Glan SS)
LLEDO (Veranza and Main SS)
POBLACION TUPI (Polomolok, Tupi and DOLE SS)
KAMANGA
SUBSTATION
(SOCOTECO II)
TINOTO L1
TINOTO L2
Llido
SS
Lanoy SS
DOLE COBOX SS
Fishport SS
SEC
Cargill SS
Damalerio SS Airport SS
Maasim and
Kiamba SS
G
Scenario: SEC is Out, SIPS Not Activated
80MW
80MW
G
New Society SS
Peak Power
ADGI
G

6. GENERAL SANTOS SUBSTATION
Business Continuity Plan
 If only one transformer is available at Gen. Santos
Substation, SOCOTECO II will be requested to limit their
total load to only 85MW.
 SOCOTECO II may also maximize their nomination with
Peakpower and ADGI so they can load an additional
50MW.
 In this situation, 20MW of SOCOTECO II’s load will not be
supplied with power.

7. GENERAL SANTOS SUBSTATION
Long-Term Action Plan
 A 100MVA will be installed in place of the previously
decommissioned T1. Estimated completion May 2019
 A 100MVA Mobile Transformer is also scheduled to be
installed at Gen. Santos Substation. Estimated arrival
January 2019

8. GENERAL SANTOS SUBSTATION
Constraints
 Reduce reliable capacity of 100MVA Power Transformer
5. It is registering high primary and secondary winding
temperature at 80% loading only.
 Highest recorded is 119˚C, another 3˚C more will reach
the trip setting of the thermal protection.
 If T5 is truly overheating, loss of life of transformer is also
accelerating. Eventually will result to failure of paper
insulation and tripping of transformer.

9. GENERAL SANTOS SUBSTATION
Mitigations
 (Completed) MTD-B temporarily removed the trip signal of
the winding thermal protection with coordination from
manufacturer since the thermal sensor was suspected to
be defective.
 (Proposed) reconfiguration of 69KV Bus to operate T4 &
T5 independently taking loads 95% and 65% of capacity
respectively (see next slide).
 Conduct PMS of T5 on Sept. 22 for diagnostic testing and
correct any defect.

10. GENERAL SANTOS SUBSTATION
Business Continuity Plan
 If Transformer no. 5 fail, SOCOTECO II will be requested
to limit their total load to only 85MW. 85MW will curtailed
however.
 SOCOTECO II may maximize their nomination with
Peakpower and ADGI so they can load an additional
50MW thus reducing curtailment to 20MW.

11. GENERAL SANTOS SUBSTATION
Long-Term Action Plan
 A 100MVA will be installed in place of the previously
decommissioned T1. Request P&E to fast-tract the project
to be competed much earlier than May 2019
 A 100MVA Mobile Transformer is also scheduled to be
installed at Gen. Santos Substation. Estimated arrival
January 2019

12. GENERAL SANTOS SUBSTATION
Proposed reconfiguration of 69KV Bus

13. GENERAL SANTOS SUBSTATION
Possible Scenarios in Critical Loads
 Failure of aging Oil CB Z-CB04(5LI1GSA-TIN)GSA
Business Continuity Plan: Transfer power supply of
5LI1GSA-TIN to Z-CB04(5LI1GSA-SX1)GSA
 Failure of aging Oil CB Z-CB04(5LI1GSA-LLE)GSA
Business Continuity Plan: Transfer power supply of
5LI1GSA-TIN to Z-CB04(5LI1GSA-SX3)GSA which is
already on use

14. GENERAL SANTOS SUBSTATION
Possible Scenarios in Critical Loads
 Failure of aging Oil CB Z-CB04(5LI2GSA-TIN)GSA which
already happened
Business Continuity Plan: Immediately replaced by
transferring the spare GCB 5Z-CB04(7XF02GSA)

15. GENERAL SANTOS SUBSTATION
Possible Scenario in Matanao-Gensan 138KV Line 1
 Failure of 7Z-02CB08GSA which currently 7Z-
02CB24GSA and 7Z-02CB04GSA are open due to defect
in contact resistance of the later PCB.
Business Continuity Plan: Bypass 7Z-02CB04GSA by
connecting former transformer 2 overhead bus directly to
7BS01GSA.

16. TACURONG SUBSTATION
Constraints
 A 100MVA Power Transformer T4 will be installed at
Tacurong Substation but cannot be utilized since 69kV
Bay High Voltage Equipment were not included in the
contract. T4 was supposed to be a replacement for T2 but
T2 is still currently fit for operation
 Defective mechanical linkage of 5Z-DS03(7Z-XF03TAC)

17. TACURONG SUBSTATION
Short-Term Action Plan
 Temporarily Utilize the 69kV HVEs of 50MVA T1
 T1 shall be temporarily decommissioned
 A proposal for reconfiguration has already been prepared by Mr.
Benjamin B. Miranda.
 Follow-up P & E for the repair of 5Z-DS03(7Z-XF03TAC)

18. TACURONG SUBSTATION
Long-Term Action Plan
 Procure 69kV HVEs for T4 c/o OMMD-MOM.

19. KIDAPAWAN SUBSTATION
Constraints
 The Transformer Load at Kidapawan Substation is
already at 85.1%
 Lack of N-1 contingency for Transformer T2 since T1 was
decommissioned due to a defective bushing based on
MTD-B’s test results.
 Two 69kV Bushings of T2 needs to be replaced.

20. KIDAPAWAN SUBSTATION
Business Continuity Plan
 If the remaining T2 of Kidapawan Substation will be
isolated, the load of Kidapawan Substation can be
temporarily shifted to Tacurong Substation.
 However, during this situation, Kidapawan Substation
Customers will experience low system voltage.

21. TACURONG
SUBSTATION
50 MVA T1
50 MVA T2
SURALLAH
KALANDAGAN
DATU SAUDI AMPATUAN
KIDAPAWAN
SUBSTATION
BAGONTAPAY
Line Limit = 40 MW
M2GPP
SUKELCO M3
G
Shifting of Load from KID to TAC SS
34MW
100 MVA T3
M1GPP
G
MAT L2
MAT L1
50 MVA T1
50 MVA T2
SUKELCO M4
COTELCO M5
34MW
47MW
COTELCO M2
COTELCO M5
COTELCO M4
COTELCO M8
COTELCO M1
SURALLAH (SPARE)

22. KIDAPAWAN SUBSTATION
Business Continuity Plan
 To maintain reliability of Tacurong-Bagontapay 69kV Line,
40MW load must be maintained. Therefore, with an
existing load of Tacurong Substation which is 9MW,
Kidapawan Substation can only transfer 31MW out of
their 43.4MW load.
 COTELCO (Main) has to implement load curtailment to
prevent overloading of the line and to improve system
voltage.

23. KIDAPAWAN SUBSTATION
Short-Term Action Plan
 Replace the defective bushings of 50MVA T2
 1 replacement bushing is already available at Baloi S/S
 Scout for 1 more bushing

24. KIDAPAWAN SUBSTATION
Long-Term Action Plan
 Installation of 50MVA Transformer from Culaman S/S to
restore N-1 Contingency (c/o P & E)
 Expedite the construction of Kabacan Substation (c/o P &
E) to reduce some of the load of Kidapawan Substation
(already currently at 86.8% of capacity)

25. SULTAN KUDARAT SUBSTATION
Constraints
 Lack of N-1 contingency for 75 MVA T1 since 30MVA T1
and T2 were decommissioned due to defective bushings
 Lack of N-1 contingency for 138kV Transmission Line

26. SULTAN KUDARAT SUBSTATION
Business Continuity Plan
 If the remaining T1 of Sultan Kudarat Substation will be
isolated or if Kibawe-Sultan Kudarat 138kV Line is not
available, the load of Sultan Kudarat Substation can be
temporarily shifted to Tacurong Substation
 However, during this situation, Sultan Kudarat Substation
Customers will experience low system voltage

27. TACURONG
SUBSTATION
50 MVA T1
50 MVA T2
SURALLAH
KALANDAGAN
DATU SAUDI
AMPATUAN
Line Limit = 40 MW
SULTAN KUDARAT
SUBSTATION
BAGONTAPAY
SUKELCO M6
Shifting of Load from SKU to TAC SS
29MW
100 MVA T3
KIBAWE
30 MVA T2
75 MVA T3
SUKELCO M2
29MW
47MW
MAGELCO M5
LPC
G
SIMUAY MIDSAYAP
SURALLAH (SPARE)
30 MVA T1
MAGELCO M2
MAGELCO M4
CLPC
Salimbao
CLPC
Sinsuat
CLPC
Malagapas
G

28. SULTAN KUDARAT SUBSTATION
Business Continuity Plan
 To maintain reliability of Tacurong-Datu Saudi Ampatuan
69kV Line, 40MW load must be maintained. Therefore,
with an existing load of Tacurong Substation which is
18.4MW, Sultan Kudarat Substation can only transfer
21.6MW out of their 57.3MW load.
 Lamsan Power Corporation can supply 15MW while
CLPC’s Diesel Plant can generate 12MW.

29. SULTAN KUDARAT SUBSTATION
Business Continuity Plan
 MAGELCO and COTELCO-PPALMA will need to
proportionally curtail 8.7MW of load.

30. SULTAN KUDARAT SUBSTATION
Short-Term Action Plans
 Re-evaluate the possibility of energizing T1
 Scout for replacement of defective bushings of T2
 Split the 69kV Bus of Sultan Kudarat Substation
 Expedite the commissioning of Capacitor Bank Nos. 3
and 4 to address low system voltage

31. SULTAN KUDARAT SUBSTATION
Long-Term Action Plans
 Installation of 75MVA Transformer from Sta. Barbara
Substation
 Expedite the Construction of Tacurong-Sultan Kudarat
138kV Line to address lack of N-1 contingency