ATTENDING BREAKDOWN BY INTERNAL INSPECTION AND REPLACEMENT OF REQUIRED GASKET AND ALL TESTING OF 160 MVA TRANSFORMER AT 220 KV SUB-STATION BARAHUWA UNDER ETD-II GORAKHPUR

Amount

Shifting of 40/50 KL oil tanker from anywhere to 220 KV S/S Barahua near Transformer plinth with the help private crane for internal inspection of 160 MVA Transformer (distance upto 200 Km)

Shifting, Loading, Carriage and unloading of Transformer oil drums as per requirement anywhere to 220 KV Substation Barahua by private truck upto 200 Km.

Partly dismantling of 160 MVA Transformer accessories for internal inspection at 220 KV Substation Barahua.

Drain out of complete Transformer oil from 160 MVA Transformer main tank to empty oil tanker with help of centrifuging machine (Centrifuging machine with operator shall be arranged by the contractor)

Providing of dry air generator at time of internal inspection of 160 MVA Transformer main tank.

Opening of inspection plate for internal inspection of 160 MVA Transformer and re-fitting with replacement of new gaskets of good quality Nu-Cork/ Turboze make & proper tightening of nuts & bolts for complete the job.

Replacement of HV/LV side bushing gasket of 160 MVA Transformer by good quality of rubberized cork sheet Kotika/Telbroze/Nu-Cork make at 220KV Substation Barahua.

Providing and fixing of Y-Phase turret bushing tertiary CT Terminal plate of 160 MVA Transformer.

Erection of HV/LV side 160 MVA 220/132 KV Transformer Bushing at 220 KV Sub-Station Barahua (Crane with Operator shall be arrange by the contractor).

Internal inspection of 160 MVA Transformer, and checking of HV/LV side winding lead of Transformer, tightening of joints, connections and all other components inside the main tank of 160 MVA Transformer at 220 KV sub-station Barahua.(As per instruction of service Engineer)

Cleaning of slugs and flushing of Transformer core winding in main tank with hot Transformer oil through centrifuging machine(As per instruction of service Engineer).

Complete evacuation of 160 MVA Transformer main tank and filling of Dry air /Nitrogen of dew point -500 C or better in vacuum up to pressure of 0.25Kg/Cm2 and the again evacuating the Transformer tank after required time interval (approx. 12-24 Hrs) using centrifuging machine the work shell including connecting pipe of machine as required measuring Due Point values of dry air during every cycle job ( One job is defined as complete cycle of evacuation, filling and maintaining of dry air in the Transformer main tank ), till the required value is achieved.

Create the vacuum inside the main tank of 160 MVA Transformer & stand at 24 hrs before filling the Transformer oil including vacuum standing test.

Centrifuging of Transformer oil in 40 KL oil tanker by Ultra high vacuum oil filtration plant after connecting the centrifuging the pipe with oil tanker to oil filtration plant including taking the BDV value of oil periodically till the required value is achieved. (approx.50 KL)

Sampling and testing of Transformer oil at CPRI testing lab including cost of transportation of samples in standard sampling bottles (adequate number of bottles to be arranged by contractor), Samples to be taken at following intervals (as per actual requirement) Before filling in transformer main tank &OLTC i. Breakdown voltage ii. Particle Count iii. Dissolved Gas Analysis. iv. Sediment &Sludge v. Dieelectric Dissipation factor(Tan Delta)

Sampling and testing of Transformer oil at CPRI testing lab including cost of transportation of samples in standard sampling bottles (adequate number of bottles to be arranged by contractor), Samples to be taken at following intervals (as per actual requirement) ( 01 Job for each sample) Before charging of T/F main tank and OLTC Samples i. Breakdown voltage ii. Particle Count iii. Dissolved Gas Analysis. iv. Sediment &Sludge v. Dieelectric Dissipation factor(Tan Delta)

Sampling and testing of Transformer oil at CPRI testing lab including cost of transportation of samples in standard sampling bottles (adequate number of bottles to be arranged by contractor), Samples to be taken at following intervals (as per actual requirement) After charging of transformer main tank &OLTC i. Breakdown voltage ii. Particle Count iii. Dissolved Gas Analysis. iv. Sediment &Sludge v. Dieelectric Dissipation factor(Tan Delta)

Testing of 160 MVA Transformer at 220 KV Sub-station Barahua (Testing team with testing kit shall be arranged by the contractor). i. Insulation Resistance Measurement ii. Polarization Index iii. Magnetizing current iv. Magnetic Balance v. Vector Group Test vi. Voltage ratio test vii. Winding resistance measurement viii. Tan delta and capacitance measurement ix. Sweep frequency response Analysis

Filling of Transformer oil from oil tanker to Transformer main tank top up in conservator tank up to required level and taking the IR/BDV value oil T/F oil at an interval of 6 hrs. As per norms of T/F manufacturer. After achieving the desired value (machine shall be provide by the contractor) (Approx. 50 KL).

Jumpering of HV/LV side bushings and ready for energize of Transformer.

Strenghtening of T/F body earthing and neutral earthing of transformer (As per instruction of Junior Engineer

Versha and Brothers

Meena Elect & Engg. Works

Perfect Power Transformer Associates

Preeti Enterprises