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This proposal envisages establishment of 765/400 KV Substation along with associated lines at Ariyalur (Kilpennathur) in Villupuram District for the purpose of transfer of power either way which have been pooled at North Chennai Pooling station and the Udangudi Pooling station to the load centers at an estimated cost of Rs.213145.45 Lakhs (Gross & Nett.).
2.0 NEED:
2.1 In the 36th Standing Committee Meting on Power System Planning for Southern Region held on 04.09.2013 at New Delhi, the comprehensive transmission evacuation scheme for the proposed projects viz., NCTPS Stage III (1x800 MW), NCTPS Stage IV (2x660) projects, ETPS expansion (1x660MW) and ETPS Replacement (1x660MW) has been agreed in-principle. It has been proposed to establish 765/400KV pooling station in North Chennai complex with pooling of all the above mentioned generation Projects. In the above scheme, establishment of Kilpennathur (i.e. Ariyalur in Villupuram Dt.) 765/400 KV SS has also been approved with 765 KV DC line from North Chennai pooling station to the proposed Ariyalur 765/400 KV substation.
2.2 As the establishment of North Chennai Pooling Station may take time to materialise, it is now proposed to link the Ariyalur 765/400 KV SS with the proposed Thiruvalam PGCIL 765/400 KV substation with 765 KV DC line which has also been agreed in principle in the above 36th Standing Committee Meting.
2.3 On the 400 KV side, it is proposed to make LILO of the proposed Pugalur- Ottiampakkam 400 KV DC Quad Line via Kalivanthapattu at the 765/400 KV SS as per the principle approval of CEA.
2.4 Approval has been accorded in the 34th Standing Committee Meting on Power System Planning for Southern Region held on 16.04.2012 at Hyderabad for establishing Rasipalayam- Singarapet 2x400 DC line and for making LILO of of one Rasipalayam- Singarapet 400kV D/c line at Salem 765/400KV (POWERGRID) substation for additional interconnection with ISTS and system reliability. However, as execution of 400 KV Rasipalayam- Salem (Dharmapuri) 400 KV DC Line has been taken up it is proposed to make LILO of one of the above line at Ariyalur 765 KV SS as an interim arrangement with pending CEA approval.
2.5 The Ariyalur 765 KV SS is proposed to be connected to New Neyveli Thermal power project 400 KV Switch Yard by 400 KV DC Line which has already been cleared by CEA. Also, the Ariyalur 765 KV DC line to Alundur PGCIL 400 KV SS pending CEA approval.
2.6 Further, the 765 KV connectivity from Ariyalur 765 KV SS to the proposed Coimbatore 765/400 KV SS which has been agreed in principle by CEA will be included while getting administrative approval for establishment of the proposed 765/400 KV SS at Coimbatore.
2.7 Similarly, the 765 KV connectivity from Ariyalur 765 KV SS to the proposed North Chennai 765 KV pooling Station which has been agreed in principle by CEA will be included while getting administrative approval for establishment of the proposed North Chennai Pooling Station.
2.8 The availability of space for 400KV Bays at Alundur (PGCIL) 400 KV SS and
765 KV bays at Thiruvalam (PGCIL) SSis ensured and the abay cost will be dealt separately.
2.9 The establishment of a 765 KV SS is necessary to transfer of power either way which have been pooled at North Chennai Pooling station and the Udangudi pooling station to the load centers.
2.10 Hence, this proposal for establishment of 765 KV SS at Ariyalur with 2x1500 MVA, 765/400 KV ICTs has been evoled.
5.0 BRIEF DETAILS OF WORKS INVOLVED:
5.1 765/400 KV SS AT ARIYALUR
i) Establishment of 765/400 KV SS at Ariyalur with 2x1500 MVA ICTs with associated switchgears and accessories.
ii) Erection of 3 nos 765 KV feeder bays including one no. spare and one no.765 KV bus reactor bay.
iii) Erection of 10 nos 400 KV feeder bay provision for 400 KV DC line from Neyveli switchyard, one no.spare feeder bay and one no.bus reactor bay (Total 12 Nos.400 KV bays.
iv) Erection of Bus Reactors at 765KV & 400 KV Buses and line reactors for 400 KV feeders.
5.2 Associated Transmission Lines:
i) Erection of 765 KV DC line on DC tower (wind zone 4, TC-1) with Hexa Zebra conductor from Ariyalur to Thiruvalam PGCIL 765/400 KV SS-160 kms.
ii) Erection of 2x400 KV DC Quad line by making LILO of Pugalur-Kalivanthapattu/ Ottiyambakkam feeder 400 KV DC line (wind zone 4, TC-2) with Quad moose conductor (Both circuits) at proposed Ariyalur 765/400 KV SS. (Cost as per BP No.59 dt3.12.12) – 20 kms (2x10 Kms).
iii) Erection 400 KV DC Quad line by making LILO of Rasipalayam (Coimbatore) –Dharmapuri 400 KV DC line (wind zone 4, TC-2) with Quad moose conductor (One circuit only) at proposed Ariyalur 765/400 KV SS- 180 kms.
iv) Erection of 400 KV DC line on DC towers (wind zone 5, TC-1) with twin moose conductor from proposed Ariyalur 765/400 KV SS- to Alundur-170 kms.
6.0 LAND AVAILABILITY:
Approval has been accorded vide Per, CMD TANGEDCO Proc. No. 424 Dt.30.09.13 for payment of Rs.6,83,05,999/- (Rupees six core eighty three lakh five thousand nine hundred and ninety nine only) towards the cost of 42.54.5 hectares of Patta land from 42 different land owners comprised in various survey numbers in Ariyalur village, Sankarapuram Taluk, Villupuram District for the establishment of a 400 KV SS and the same can be utilized for establishment of the 765 KV substation. Land is under process of acquisition.
7.0 COST ESTIMATE DETAILS
The cost of the estimate works out to Rs.213145.45 lakhs (Gross and Nett) (Detailed) estimate in annexed). Estimate is prepared based on 2013-14 cost data for the 400 KV equipments and PGCIL rate for 765 KV equipments. The rates furnished by the Field is adopted for Civil works and for other materials which are not available in cost data.