Meeting with BMRCL/KPTCL held on 31st December 2015 Page 1

SOUTHERN REGIONAL POWER COMMITTEE BENGALURU

Record Notes of the Meeting to discuss disruption of power supply affecting

BMRCL services

A Meeting to discuss disruption of power supply affecting BMRCL services was

held on 31st December 2015 with participation from BMRCL, KAR SLDC, KPTCL,

SRLDC & SRPC. The list of the participants is at Annexure-I.

Shri S.R. Bhat, Member Secretary, SRPC welcomed the participants to the

Meeting. He stated that BMRCL services were affected on 21st December 2015 and on

17th December 2015 due to power supply issues. He quoted the media reports which

stated that the problem was reportedly not in the grid side. He expressed concern and

emphasized that the issue needs to be deliberated to ensure that the services of BMRCL

are not affected either due to grid side problem or due to electrical side problems in

BMRCL network.

Agenda was taken-up for discussion. BMRCL point-wise reply of the agenda

items is at Annexure-II.

Disruption of BMRCL services/failure of Grid supply

Following were the major interruptions in BMRCL services :

07th April, 2014 - 675 passengers refunded fare amount after power outage for an hour.

15th April, 2015 - 72 passengers evacuated after power outage in same stretch.

17th Dec, 2015 - Services hit for 11hrs on Yeshwantpur – Mantri square Sampige road stretch due to power failure.

21st Dec, 2015 - Disruption of services on the Metro’s Green Line from 1.03 pm to 1.53 pm between Yeshwantpur and Mantri Square Sampige Road stations.

The list of Grid power supply failures of reach-1 and Peenya RSS failure

details were furnished( in Annexure-II). It was confirmed that there was no

de-boarding of the passengers from train due to incoming KPTCL/BESCOM

supply.

Meeting with BMRCL/KPTCL held on 31st December 2015 Page 2

It was confirmed by BMRCL that the incidents of 17th and 21st December were

due to internal grid problem of BMRCL and the grid supply from

KPTCL/BESCOM was intact. The designer and M/s. ABB have been called to

carry out the root cause analysis and identify and implement the remedial

measures. Once the report is finalized, it would be shared with SRPC/SRLDC.

KPTCL suggested that relay setting also needed to be reviewed, tested and

verified during this exercise. BMRCL agreed to carry out the same and would

furnish compliance report.

It was noted that as per Scheme, only faulty section should have been cut off in

the BMRCL network and this issue also needed to be addressed by the

designer/ABB.

Provision of DG of suitable capacity to ensure that the Metro train reaches the Railway Station

In earlier meetings BMRCL had been suggested to consider provision of DG of

suitable capacity so as to ensure that the Metro train reaches the nearest

Station in line with the Enquiry Committee recommendations. BMRCL vide

letter dated 14th February 2014 (Annexure-III) had informed that there was

no provision to extend DG supply to Traction network. This was an

internationally accepted practice. However, provision for ventilation and

passenger evacuation was ensured.

In the meeting, Dy.CEE (U/S), BMRCL stated that they had again contacted

Delhi Metro and there was no provision/plan for DG for traction loads. For

traction power supply, the redundancy of power system, through multiple

number of Receiving Sub-Station (one in each corridor) has been ensured in

BMRCL.

SRPC/SRLDC stated that keeping in view with the regional grid condition,

recommendations of Enquiry Committee, natural calamities like TN Flood,

Hud Hud cyclone etc. BMRCL and other Metros of SR were being advised to go

for DG for traction loads. BMRCL representative’s were suggested to appraise

their Management about the necessity/requirement and suitable call needs to

be taken.

Meeting with BMRCL/KPTCL held on 31st December 2015 Page 3

Intermediate power source at Majestic

Dy.CEE (U/S), BMRCL informed that based on the power supply simulation

study for Metro System by expert agencies, the location of intake power supply

from KPTCL and the location of receiving Sub-Station (one in each corridor)

was decided and it is designed for reliable operations.

However, the inter-linking sub-station of BMRCL at Majestic would be ready

by March 2016. Power supply through cables from receiving station could be

extended to other receiving station through Majestic SS of one stretch.

BMRCL was requested to revert back on whether supply from any of the

receiving stations could be extended to any of the other receiving station.

SRLDC observed that whether charging of such long cables was possible due to

capacitive switching. BMRCL agreed to revert back on this.

Two independent sources of power at BMRCL Receiving Stations

The diagram of infeed of BMRCL Receiving Stations furnished by BMRCL is

available in Annexure-II.

The power supply from Metro diagram furnished by SRLDC is at Annexure-

IV.

KPTCL informed that all the stations were having alternate supply (except 66

kV Welcast) to BMRCL at 66 kV and 220 kV levels. The supply could be

switched to alternate supply in less than 500 msec. Besides the alternate

supply, they were having redundant supply which could be made available in

around 5 minutes. This was being tested periodically and suitable instructions

have been communicated to the sub-stations.

KPTCL informed that few days back, Yelahanka 220 kV SS (two 220 kV buses

and 2 x 150 MVA transformers) have been energized and were idle

charged.220 kV Neelmangla - Hoody line had been LILOed at Yelahanka. The

station was under testing and it could be loaded shortly. Welcast SS was

planned to be connected to Yelahanka SS. Later this station was planned to be

connected to 400 /220 kV SS of PGCIL.

Mock Black start exercises

Meeting with BMRCL/KPTCL held on 31st December 2015 Page 4

Since the problem was in BMRCL network it was recommended that a mock

exercise of extending the supply from Main/Alternate/Redundant to different

TSS of BMRCL and further down- stream (DC system) would be carried out on

21st January 2016.

The exercise could be taken up during the time when Metro services are not

available in co-ordination with SLDC, BESCOM & KPTCL SS. Compliance

Report in this regard would be furnished to SRPC/SRLDC by BMRCL/SLDC.

It was agreed that mock exercise would be held in each quarter and report

would be furnished by BMRCL/SLDC to SRPC/SRLDC.

Other issues

BMRCL informed that Mr. G. Mani, DGM (Traction) was the new Nodal

Officer. BMRCL was requested to communicate the details like address, phone

number, mobile number, fax number, e-mail id etc of the Nodal Officer to

SLDC/SRLDC/SRPC.

BMRCL was requested to furnish the details of second in command.

SLDC & BMRCL confirmed that the hot line was working and healthiness was

being ensured.

Member Secretary, SRPC thanked the participants for their valued contribution

and requested BMRCL & KPTCL to address the issues at the earliest.

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