List of Substations been constructed for transmission so far during the years…

Substations:

• 400Kv dc quad transmission line – Kudankulam Nuclear power plant
• 230KV Bahoor substation
• 110KV Vanur substation
• 230KV Mullodai sub station
• 230KV Villianur sub station
• 110KV Marapalam sub station
• 110KV Thirukovalai sub station (Awarded medal best design and for fast completion of work)
• 110KV Voimedu sub station
• LILO Mayiladurai to thanjavur 230KV line
• Gas Turbine Power Plant Kuthalam to Mayiladudurai
• 110KV Vadavathimangalam to thiruvarur substation
• Thiruvarur 230KV auto substation H type and J type towers
• 110KV Aripakam sub station
• Transmission Line
• 110KV Sedarapet to thethampakam foundation, erection and stringing of conductors in towers
• 110Kv transmission line trichrembalam to Vanur
• 110Kv marapalam to villianur sub station.
• 110KV Vadavathimangalam to thiruvarur line and substation
• 110KV line Thiruvarur to Thiruthuraipoodi
• 110KV line from Kumbakonam to Kodavasal
• 110KV line Mayiladurai to Arora sugars, Kulumankudi
• 110KV Ambika sugars to Thirupunanthal
• 230kv Transmission Line from villiyanur to Neyveli thermal II

                                                               
Services :

1. 400KV DC quad transmission line – Gammon India Ltd.

400kv dc quad line veeramanur village to ottiyambakkam. Portion of Pugalur Substation to Ottiyambakkam Substation and line portion to kalivanthapattu 400Kv SS transmission line of TANTRANSCO.

2. 400KV DC quad transmission line – KEC Ltd.

A foundation work on 400KV double circuit line Pandiyankuppam village to Veeramanur 110KV Transmission line Sub setting, concreting, earthing of towers Reach 6 from location 64 to 80 Madurapakkam to tiruchitembalam 110KV line

1. Subsetting, concreting earthing of towers Location 8 to 19 Kadanlankudi to vaitheeswaran kovi 110 line
2. Stringing of power conductors and earthing wire in reach from location 12 to 26 LILO of aadudurai to Manalmedu 110kv line at MAyiladurai(kadalankudi 230KV SS
3. Transport and erection of twoers from location of 46 to 68 and stringing of conductors of from location 67 to 90 from Kadankudi to Manalmedu
4. Subsetting, concreting, refilling earthing of towers location 1 to 25 110kv line dc line LILO of existing manarkudi to pattukottai – Gas turbine power project near the existing vadacheri 33/11kv SS
5. Subsetting concreting and earthing of towers reach 2 from location 16 to 47 of 110kv sc line on dc line from sedarapet SS to theythampakkam SS 110Kv, Pondicherry
6. Tower Erection from location 105, 34 and stringing of power conductors and earth wires from location 14 to 134. PPnalur to thirukadaiyur GTPP kadankudi
7. 230kv dc line reach 11, subsetting concreting and earthing of twowers of location 45 to 70 LILO neyveli thermal station to thiruvarur 23KV Sc line to Mayiladurai 230KV SS
8. Conctruction of additional, retaining walls, providing plinth for equipments in extended area of 11kv line MAylidurai 110Kv SS
9. Exavation of towers from Kodavasal 110KV Sc line
10. Providing GI barbed wire fencing around boundary of SS, filling of low lying area. Construction of reatinig walls for filling area of 110KV/11KV SS
11. Construction of control room and transform plinth, breaker plinth at thirukovalai 110Kv SS
12. Subsetting and concreting reach 3 loaction 23 to 48 of villianur to thirubuvanai line
13. Transport and erection of towers of and stringing 21 to 52 and hosting of insulator, stringing of power conductors location 22 to 42 at kodavasal. SC line on Dc tower
14. Construction of control room, transform plinth, breaker, yard leveling at vadathimangalam 110KV SS
15. Construction of cable duct at 33kv side at aripakkam 110/22kv SS
16. Subsetting, concreting and earthing of towers Madurapakkam location 68 to 109 Thiruchirterbalam
17. Earth wprk, excavation, subsetting, concreting, Transport of towers and conductors from location 11 to 44 of MRL Nagapattinam reach 1 and 2.
18. Control room and J type, breaker plinth, switch yards at Mayiladurai 230KV Auto SS.

Services for Designing and Modeling:

Modelling of synchronous & induction generators and motors in MATLAB for TNEB projects which is being carried out in various parts of Tamil Nadu especially for kudankulam power plant project.

We plan to review three different generator technologies for comparison: permanent magnet (PM), induction, and switched reluctance (SR). All these three are suitable for highspeed operation in the speed range considered here. There are other technologies such as synchronous reluctance and homopolar that are suitable for high-speed operation but are not
considered in this paper. We also limit our discussion to radial geometric configurations for the three technologies. Axial gap geometric configurations are not considered.

Permanent Magnet (PM)

Micropower systems currently in the market use the generator designs based on the PM
technology. The generator itself has two electromagnetic components: the rotating magnetic field constructed using permanent magnets; and the stationary armature constructed using electrical windings located in a slotted iron core.

The PM’s are made using high-energy rare earth materials such as Neodymium Iron Boron or
Samarium Cobalt. Retention of the PM”S on the shaft is provided by high strength metallic or
composite containment ring. The stationary iron core is made of laminated electrical grade steel. Electrical windings are made from high purity copper conductors insulated from one another and from the iron core. The entire armature assembly is impregnated using high temperature resin or epoxy.

The voltage output from the generator is unregulated, multiple phase ac. This voltage
varies as a function of the speed and load. This voltage output is connected to a solid state power conditioning system. Typically, the solid state power conditioning system uses buck/boost techniques and regulates the entire power output.

Induction:

The technology of induction generator is based on the relatively mature electric motor technology. Induction motors are perhaps the most common types of electric motors used throughout the industry. Early developments in induction generators were made using fixed capacitors for excitation, since suitable active power devices were not available. This resulted in unstable power output since the excitation could not be adjusted as the load or speed deviated from the nominal values. This approach became possible only where a large power system with infinite bus was available, such as in a utility power system. In this case the excitation was provided from the infinite bus. With the availability of high power switching devices, induction generator can be provided with adjustable excitation and operate in isolation in a stable manner with appropriate controls.

Induction generator also has two electromagnetic components: the rotating magnetic field constructed using high conductivity, high strength bars located in a slotted iron core to form a squirrel cage; and the stationary armature similar to the one described in the previous paragraph for PM technology.

The technology of SR generator is based on the concepts that magnetically charged opposite poles attracts. Typically, there are unequal number of salient poles on the stator and rotor. Both are constructed of laminated electrical grade steel. Figure 4 shows a cross sectional view of the construction of the SR generator. The number of poles shown on the stator is 6. The
number of poles shown the rotor is 4. Other pole combinations such as 8/6, 10/8 are possible.There is no winding on the rotor. Armature coils located on stator poles are concentric and are isolated from one another. When the coils on opposite poles such as 1 and 1 shown in Figure 4, are excited the corresponding stator poles are magnetized. The rotor poles A-A are closest to the stator poles 1 and 1. These are magnetized to opposite polarity by induction and are attracted to the stator poles. If the prime mover drives the rotor in the opposite direction, voltage is generated in the stator coil to produce power.