SLDC Control Room Case Study
Lifting of Restrictions & Normalisation of System thereof
From Power Controller Desk
220 KV Khodri-Majri Line was out since 13:20 Hrs of 07-01-2010, due to outage of 220KV Khodri-Rishikesh Line. Due to this, system at Giri (H.P) was as under:
1. 132 KV Paonta was being through Jalandhar System.(Load restriction of ~8MW)
2. 132 KV Kala Amb was being fed through Jalandhar System.(Load restriction of ~35MW)
3. 132/33 KV Local Transformer-I was isolated.
4. 132/33 KV Local Transformer-I was being fed through Kulhal System.( 8MW Load allowed by SLDC, Rishikesh).
Apart from this, Load restriction to the tune of 15 MW on GACL & 15 MW on Barotiwala-II was in force as same Load was already on Jalandhar System.
On dated 09.01.2010 at about 14:40 Hours, Khodri supply was restored up to Giri & initially 40-50 MW Load was allowed. Thus initially following change over were done:
1. At 14:45 Hrs. Khodri Supply was taken on 132KV Bus through 220/132KV Transformers a/w 132 KV Kulhal Supply & Kulhal Supply was disconnected, thus feeding 132/33 KV Local Transformer-II through Khodri Supply.
2. 132 KV Paonta was shifted from Jalandhar System to Khodri- 14:47 Hrs.-14:49 Hrs.
3. 132/33 KV Local Transformer-I charged 15:02 Hrs.
4. All restrictions at Paonta, Kala Amb, Local Transformers-I&II and GACL lifted at 15:00 Hrs. Restrictions on Barotiwala-II kept as it is as Giri Machine was Scheduled Zero MW w.e.f. 15:45 Hrs.
5. At about 15:15 Hrs, on contacting SLDC, Rishikesh for drawing normal Load on 220KV Khodri-Majri line, same was allowed by Rishikesh. System at Giri was again changed as follows:
a. 15:25 Hrs.-15:30 Hrs.- Paonta Shifted from Khodri to Jalandhar System.
b. 15:26 Hrs.-15:28 Hrs.- Kala Amb Shifted from Jalandhar to Khodri System.
In the mean time normal load was allowed to Barotiwala-II at 15:26 Hrs. & with this all restrictions stands lifted and complete H.P. System normalized.
Points of reference compiled by: Er. Vikas Sharma SLDC Control Room
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