Namdar Sanat Azar Asa (NA. S.A) is an Iranian company that provides power engineering services and high voltage equipment like multi-chamber arresters for protection of distribution and transmission lines against lightning. The company was founded in 1998 by managers and experts from government institutes and private sector to meet needs of Iranian electrical market. It offers products and services for electrical networks up to 400kV, including novel multi-chamber arresters, composite insulators, room temperature vulcanizing silicone rubber coating for insulator maintenance, and transmission line engineering services to improve reliability.

1. NAMDAR SANAT AZAR ASA ENG. CO.
(NA.S.A.)
No.10, West 7Th St., Ettehad Ave. Damavand Rd, Tehran 1658735711 Iran
Tel :(+98 21) 77348623 and (+98 21) 77348816 and (+98 21) 77339630
Fax :( +98 21) 77326833

2. Namdar Sanat Azar Asa (NA. S.A) with the main scope of working in the
areas of power engineering services and providing high voltage
equipment especially Multi Chamber Arrester (MCA) new innovation of
streamer co. for protection of distribution and transmission line against
lightning.
Introduce

3. • The core idea to found this company was to gather individual managers and experts
from governmental institutes and private section to meet the needs of Iranian market of
electrical industry, whom are in a position to recommend special products to regional
utility companies and industrial cases. The company’s management and partners enjoy
long experience, background and connections in the related sketch of business.

4. • Long presence of the company’s partners in the industry which has been
established on 1998, has welcomed potentiality for occasional business
joint activities and financial support from private section with huge
investment possibilities in case needed as additional advantage we rely on.

5. • These days, Company's activities are an amalgam of electrical power
industries and engineering services and marketing and trading of new
products for power electrical network up to 400 kV.

6. Product description
A novel Multi chamber arrester has been developed and as a unique
network component help utilities companies to decrease lightning
effects.

7. • Detailed description
• Prevent insulator and conductor breakage
• Protect sensitive component (Surge arrester, transformer)
• Avoid outage on the line
• Avoid short circuit (follow current)
•
• No grounding to adjust and control
• No copper ground lead required
• Self-protected product
• No maintenance required
•
• Application of SI Composite will make it possibe to protect 35 kV and 110 kV power overhead lines
from direct lightning strokes and backflashovers as well as their consequences
• Developed for protection of overhead power lines from outages caused by lightning activity.

8. Product description
Composite insulators have become a highly developed alternative to conventional
insulators in all transmission level voltage classes for AC and DC applications around the
world.

11. Service description
RTV covering presented as an effective and economic maintenance method. In addition, this
method compares with. HVIC is the only appropriate method for high NSDD and “very
heavy” pollution degree regions and recommended.

12. Detailed description
High voltage insulators have to be used as insulating supporters in various
environments in polluted area. The electrical performance of insulators will be
degraded. The polluted insulators will have over withstand voltage, flashover can occur
easily when the air becomes wet by humidity or fog, which affects on the reliability of the
power systems. In order to define effective counter measures against pollution flashovers
there are conventional methods such as periodically water washing and also using silicone
grease for insulation. Water washing of insulators which is normally recommended so as
to remove the pollution from the insulator surface needs to be done more frequently
than other maintenance methods. Though involves some limitation in practice from the
technical and economical point of view. Applying of silicon grease on insulators with high
cost of performance also is not recommended for use in an environment where high
level of NSDD pollution is present. In this paper room temperature vulcanizing (RTV) silicone
rubber coating have been presented as a novel approach for improvement of outdoor
substation insulators maintenance in polluted area. This method can be used in areas
characterized with “Instantaneous pollution” and or with “High or Low level of NSDD”
with long life expectancy. Financial analysis shows that this method is also economic and
optimal choice.

15. Service description
Transmission line engineering services could improve reliability
of network.
Deicing of Transmission line ,Reduction of galloping effects
Interphase spacer development

16. Detailed description
Line compaction is a proven method not only for reducing line width, but also for increasing the
transmission capability of the line due to lower surge impedance. In addition, the electric and
magnetic field at the edges of the line corridor are reduced to such an extent that they are not
expected to have any negative effects on the environment.
As already explained in the chapter on compact lines, line compaction is pri- marily based on the
principle of minimizing interphase spacing. As a result of this, and also since the interphase
spacings are somewhat smaller than those encoun- tered in the case of normal overhead
transmission lines, there is greater risk of interphase flashover with a compact design when two
conductors are moved close to one another, for example as a result of wind, ice shedding or
short circuit; this may lead to an interruption in service. Interphase spacers (IPS) are used to
avoid this.
In the last few years, increased use of interphase spacers of composite design has been made
possible due to the generally massive advances made in the development and acceptance of
composite insulators. In this application, it has thus been possible to utilize the specific
properties of composite technology, such as low weight, high flexibility and excellent
hydrophobicity to name just a few.