Midsun HVIC Technical Application Guide

1. MIDSUN’S
HVIC

2. C o n t e n t s
 Who we are
 RTV HVIC
 International projects

3. Midsun Group Inc. is a US based
company established in 1992 to
help power utility and
telecommunications industries by
providing services and products to
increase reliability and save
companies millions of repair
dollars. Midsun manufactures long
lasting RTV coating for high
voltage insulators, anti-corrosive
silicone coatings and wildlife
protective silicone covers.
Midsun Group
MIDSUN GROUP HEADQUARTERS,
SOUTHINGTON, CT, USA

4. Production centers
GACO WESTERN, WISCONSIN, USA
MIDSUN SPECIALTY PRODUCTS, CT, USA
MIDSUN GROUP, TIJUANA, MEXICO

5. Midsun IKM
the international
business unit
Out of desire to expand the expertise and
know-how successfully implemented in the
USA for the last 30 years, in 2015 we opened
Midsun IKM. The Vienna office has become the
hub of Midsun’s global business operations by
coordinating large international projects and
guiding the process of the implementation,
application and maintenance.

6. What we
offer
 Exclusive RTV silicone coating and covers
 Global applicators network
 Demonstrations and training
 Multilingual service and experts
 Custom-made solutions and products
 Fast delivery

7. E/Products
Silicone
protection
for wildlife
RTV High
Voltage
Insulator
Coatings
RTV Anti-
corrosion
Coatings
Extruded and
moulded protection
products to avoid
animal and weather-
related outages.
Line of silicone
coatings made to
avoid insulator
flashovers in highly
contaminated areas
and polluted regions.
Coatings
formulated with
silicone rubber to
restore metal
structures and
equipment

8. H V I C
High Voltage Insulator Coating

9. Source: Pixabay, Pexels

10. Source: Pixabay, Siemens

12. Source: RTV SILICONE INSULATOR COATINGS Technical Evaluation and Performance | Neelesh Arora
The
Problem
Contaminants like salt spray, cement dust, salt fog, industrial pollutants,
agricultural fertilizers and even desert sand can affect the performance of
high voltage insulators and lead to costly power interruptions.
When there is a contamination deposition on the insulators, it can cause
everything between leakage currents, dry-band arcing and air ionization,
and end up with power-threatening flashovers.

13.  Power Outage
 Disruption of Service & Business
 Equipment Damages
 Safety Implications
Consequences
of a Flashover

14. Water washing, which
is short-term
solution with
extensive life-time
costs and safety
implications.
Outdated
Solutions
Over insulation, that
extends the cleaning
cycle and flashovers
may still occur.
Silicone grease, which
still encapsulates
pollutants and needs to
be washed.

15. The
Solution
Our line of silicone coatings, provide superior protection in highly
contaminated areas and polluted regions by avoiding power interruptions
due to excessive leakage current.
RTV insulator coating is a one part hydrophobic, UV resistant coating. Its
hydrophobic surface prevents water filming and encapsulates the pollution,
avoiding the ability of the contaminant to combine with water to form an
ionic solution.

16. The
Features
 Hydrophobicity
 High resistance to arcing and corona
 Resistance to atmospheric and chemical degradation
 UV resistant
 Suppression of leakage current, discharges and pollution
flashover
 Non-toxic and environmentally friendly material
 High resistance to air, airborne pollutants, rain, humidity,
etc.

17.  Hydrophobic surface prevents water filming
 Surface oil (Cyclic) coats contaminant particles
and renders them hydrophobic
 Reduces the contaminants ability to combine with
water to form an ionic solution
 Maintains these features over the long life of the
installation
How does
HVIC protect?

18. How does
HVIC protect?
Un-coated Insulator Coated Insulator

19. How does
HVIC protect?
L.M.W
Layer of High Voltage Insulators Coating
Pollution particles
LMW silicone fluid diffuses from the bulk of the
coating to the surface acts to impart non-wetting
characteristics to deposited contaminants by
surrounding the particles with a monolayer of fluid.
Low molecular weight (LMW) components are
responsible for the hydrophobic surface of the
coating. Water repellence and a low surface energy
will be obtained on hydrophobic surfaces.

20. Contaminant
Water
Droplet
RTV
LMW
RTV
LMW
Rain
Contaminant
Encapsulating the Contaminant
Mitigation Process Recovery
Insulator’s
Surface

21. How does
HVIC protect?
Main characteristics of Midsun’s silicone coating: hydrophobicity
retention, recover and transfer across the contaminated layer
RTV provides a barrier between the insulator and potential contaminants

22. Applicatio
n
Applicatio
n

23. How to
Implement it?
Midsun HVIC can be applied in 4 different ways and they all maintain the
product’s effectiveness:
By paintbrush for small jobs
Air assisted / airless spray equipment
By dipping
Robot (Automated Application System)

24. The insulators’ surface must be totally clean and dry
before applying the coating to ensure proper adhesion of
the RTV coating to the insulator surface.
Surface
Preparati
on

25. Coating
Preparati
on
The material preparation involves the final mixing and
dispensing of the coating into the application equipment.
Midsun HVIC is supplied ready for use. There is no further
dilution necessary. The coating should be homogenized truly
to ensure an even dispersion for spraying. This can be done
by steering with mixer or by shaking or rolling of the
bucket.

26. This is for whom the
presentation is
Masking
Covering all the parts that are not intended to be
coated

27. Midsun’s coating
is sprayed in the
same manner as
many other
coatings.
Flat, white spray
patterns are good
for open
accessible surface
such as top of
insulator sheds.
Applicati
on
Technique

28. Two layers are typically
required to fill the
recommended layer thickness.
The coating surface must become
track-free before application
of subsequent coat, otherwise
flow will appear giving rise to
drops and icicles
Applicati
on
Technique

29. Applicati
on
Technique

30. TECHNICAL DATA

33. T E S T S

34. This is for whom the
presentation is
The above elements can be considered as a reference for type tests.
Type
TESTS
Test Reference
Dry Arc resistance IEC 61621
Inclined plan test IEC 60587, Clause 5.2
Hydrophobicity IEC TS 62073
Thickness See above section 2
Adherence by scratch EN ISO 2409
Adherence after 100h boiling
water
IEEE 1523 / LV/IWG-
02(96), Clause 5.1, Water
Penetration
Test
Tracking & Erosion test
IEC 62217 (2012), Clause
9.3.3

35. Sample
TESTS
Tests Reference
Visual inspection
Hydrophobicity IEC TS 62073
Thermal Gravimetric Analysis
(TGA)
CIGRE TB 595
FTIR CIGRE TB 595
Specific gravity CIGRE TB 595
Adherence EN ISO 2409
Thickness 280 µm – 430µm
The above tests can be used as sample tests
with sampling size E1+E2 as per IEC 60383,
with similar retesting conditions.

36. C A S E
S T U D I E S

37. TEN
Chile
Location: SINC-SING Interconnection, Chile
Problem: TEN wanted to interconnect the
central and north systems through a
double circuit of 500kV, while avoiding
electrical interruptions, maintenance tasks
and flashover outages, taking into account
extreme temperatures, desertic and coastal
locations. After calculating the costs for
this project, the utility would have needed
to wash the insulators a minimum of 4
times per year to ensure reliability of the
lines.
Solution: To coat their insulators with RTV
HVIC

38. B
e
f
o
r
e
D
u
r
I
n
g
Source: MidsunIKM

39. A
f
t
e
r
Source: MidsunIKM

40. NTDC
Pakistan
Location: Pakistan
Problem: Prevent the tripping of the 500kv
line between China’s power generation
plant and the electrical substation.
Solution: RTV HVIC

41. B
e
f
o
r
e
D
u
r
I
n
g
Source: MidsunIKM

42. A
f
t
e
r
Source: MidsunIKM

43. SIEMENS
Egypt
Location: Al Burull, 500kV, ETTC
Problem: Al Burullu’s power plant is
located in a coastal region, which
means it’s affected by the ocean spray,
salt fog and other contaminants.
Regardless of the high creepage
distance, regular maintenance and
continuous cleaning of the insulators, in
May 2017 the conditions from this
heavily polluted area led to flashovers
and significantly affected the power
plant’s operation.
Solution: RTV HVIC

44. B
e
f
o
r
e
D
u
r
I
n
g
Source: MidsunIKM

45. A
f
t
e
r
Source: MidsunIKM

46. G L O B A L
END-USERS

47. MidsunHVIC
End-Users in
Europe

48. MidsunHVIC
End-Users in USA &
Australia

49. MidsunHVIC
End-Users in East &
South Asia

50. MidsunHVIC
End-Users in Middle East &
Africa

51. MidsunHVIC
End-Users in South
America

52. P R O D U C T S
V A R I E T Y

53. Products
Variety
We provide + 100 different silicone tubes, tapes, sheets, preformed covers,
barriers which provide a solution to bird, animal and weather-related
outages. The categories are:
 Midsun HVIC W/Quartz Silica
 Midsun HVIC W/Ath
 MIDSUN HVIC W/Silica Quartz-Naphta
 MIDSUN HVIC Solventless VOC-Grey
 MIDSUN HVIC Energized
 MIDSUN E/Paintable

55. This unique silicone
rubber technology
formula offers high
dielectric strength in a
paintable insulation.
This is the only coating
offered that allows for
energized (live line)
applications.

56. WWW.MIDSUNIKM.COM