Transmission Post Insulators

Transcription

1 MPS offers 2 distinctive silicone line post insulator designs to comply with all the requirements of the market place. Standard designs, from 69kV to 230kV, are supplied using an injection molding process. These post products are manufactured to forecast in high volumes with standard lengths & leakages. Custom designs and ratings 230kV & above are produced using the extruded rod shed process, where the posts are produced to customer order, per customer specification (custom strength, length, & leakage). Injection Molded Line Posts The insulator silicone housing is injection molded, using high temperature and high pressure injection, onto the FRP rod. The end fittings are crimped onto the molded sub-assembly using the MPS P-S-T triple seal to prevent moisture ingress to the core. The standard leakage distances offered on these products provide were designed for use in high contamination environments. These heavy contamination designs provide between 25mm/kv to 31mm/kV leakage. Features Standard Designs / Lengths Standard Leakages [25mm/kV] Produced to Forecast Injection Molded Products 30XH Class Standard Strength Posts 2.5 Rod [NPK, NBK, NBS Series] 40XV Class High Strength Posts 3.5 Rod [NBS Series] Extruded Design Line Posts The Extruded design line post insulator offers the unique ability to custom design for any application, with the flexibility to produce custom section lengths and leakage distances. Insulator section lengths can be customized to customer requirements in 1 inch increments. Variable shed count and spacing is used to provide custom leakage distances, or leakage in accordance to the IEC815 Recommendation for Polluted Areas. [Pollution Class: Low = 16mm/kV, Medium = 20mm/kV, Heavy = 25mm/kV, Very Heavy = 31mm/kV] Features Custom Designs (Variable Lengths & Leakage) Custom Leakage Distances (per IEC815) Produced to Order Extruded Seamless silicone sheath Extruded Products H1 Class Low Strength Posts 2.0 Rod [H1C1, H1C2, H191 Series] H2 Class Standard Strength Posts 2.5 Rod [H291 Series] H3 Class High Strength Posts 3.0 Rod [H391 Series] Silicone Rubber MPS uses a Silicone formulation that has been unchanged since the early 80 s. The Si-O molecular bonds (inorganic backbone of silicone) are very stable and have bond strengths higher than sunlight, making the silicone resistant to UV degradation. In addition to providing protection against ultraviolet radiation, electrical aging, and corona effect, silicone exhibits hydrophobic properties; which provide excellent recovery characteristics to control leakage currents in highly polluted or coastal environments. Line Post Insulators Page LP-1 of LP-15

2 Catalog No. Definition Injection Molded Design N P K G 30 XH 028 S 0 ANSI Class Line End Fitting Attachment Rod Size Shed Profile Number of Sheds Material Choice Corona Ring Requirement P = Fixed B = Bendable K = Trunnion S = Drop Tongue V = Vertical Trunnion G= Gain F = Flat 30 = = 3.5 XH = Series 30 XV = Series 40 S = Silicone 0 = No Ring 1 = One Ring N P K G 30 XH S 0 Injection Catalog Number Example No Corana Ring Silicone Rubber 28 Sheds Series 30 Insulator 2.5" Rod Diameter Gain Clamp Top Fixed ANSI Class To order a 28 shed, 2.5 diameter rod, Trunnion/Fixed Gain Line Post Insulator, the Catalog number would be NPKG30XH028S0 Typical End Fittings B P S K V Bendable Fixed Drop Tongue [Slotted Blade] Horizontal Trunnion [Clamp Top] Vertical Trunnion Line Post Insulators Page LP-2 of LP-15

3 Catalog No. Definition- Reliable Extruded Design H V A 00 INSULATOR TYPE BASE LINE END FITTING TYPE SECTION LENGTH (Inches) VARIABLE LEAKAGE CORONA RINGS MPS INTERNAL USE Post Orientation Type Line End Fitting Tower Line H - Horizontal V - Vertical Rod Diameter pc Flat (Steel) 3 3 Bolt Circle 4 3 Stud 5 5 Bolt Circle 8 No (Anchor only) 9 2pc Bendable Gain C 2pc Fixed Gain X - none 1 Drop Tongue 2 Horizontal Trunnion 3 3 Bolt Circle 5 5 Bolt Circle 6 Vertical Trunnion 7 F-Neck C Extended Drop Tongue D Double Trunnion X - None A - None 6 B - None 12 X - None None H V A 0 0 Reliable Catalog Number Example MPS Identification 6" Corona Ring on the Line End Variable Leakage 40" Insulator Section Length 2 Hole Drop Tongue 2 pc Gain 2.5" Rod Diameter Horizontal Post Typical End Fittings To order a 40, 2.5 diameter rod, Drop Tongue/Bendable Gain Line Post Insulator with a 6 Corona Ring, the Catalog number would be H291040VA C Anchor 5 Bolt Circle Drop Tongue Horizontal Trunnion Extended Drop Tongue Line Post Insulators Page LP-3 of LP-15

4 Line Post Options (Typical Applications) H1 / H2 / NB_G30XH - Bendable Gain (Steel) H3 (*NB_G40XV) Bendable Gain (Steel) H1 / H2 / NB_F30XH - Bendable Flat (Steel) H3 (**NB_F40XV) Bendable Flat (Steel) * NB_G40XV Bendable Gain = 12 & 14 Hole Spacing ** NB_F40XV Bendable Flat = 10 x 15 Hole Pattern *** Additional bendable base designs / mounting patterns available, contact MPS for details *** Bendable / Anchor H1 & H2 Fixed Gain (Cast Ductile Iron) Bendable Formed steel base that mates with an anchor end fitting of the insulator via 2 mounting bolts. Bendable bases come in gain and flat designs, with 0 & 12 upsweep angles, as required. Fixed Cast iron base that mates with a 5 bolt circle end fitting of the insulator (4 bolts). Where the bendable designs allow for some articulation of the insulator, the fixed base does not. The fixed design comes in gain and flat designs, with a standard 12 upsweep angle. Gain base design used to mate the insulator to a round pole surface. This base is attached to the pole through the center bolt mount holes. Flat base design used to mate the insulator to a flat surface, using either the 4 bolt holes along the ears of the base, or the 2 center mount bolt holes. Line Post Insulators Page LP-4 of LP-15

5 Corona Rings for Line Post Insulators High voltages can result in unwanted noise (RIV) and corona. To minimize the effects of corona, corona rings are applied to one or both ends of the insulator (attached onto the end fittings). Typically, for system voltages 230kV and above a corona ring or combination of rings is necessary. However, some applications may require rings at lower system voltages. Refer to the Corona Ring section of the Application Guide for detailed information or contact the factory. Recommended Corona Ring Application Class End Fitting 138kV 161kV 230kV 345kV 400kV H1 & H2 Line End None None 6" 12" 12" 30XH Tower End None None None None 12" H3 Line End None None None 12" 12" 40XV Tower End None None None None 12" For Insulators 230kV and above, MPS recommends use of Corona Rings. The Application Table above depicts typical corona ring usage on MPS suspension Insulators. For corona ring usage on special applications, environments, and elevations; please contact MPS. Trunnion Clamps ACTS Series / FCTS Series / HC Universal Clamp For clamp catalog numbers and details see ACTS, FCTS, and HC (Universal) series trunnion clamps in the Connector & Clamps section of this catalog. Clamps and Insulators can be ordered as assemblies, for details, contact your local MPS Sales Representative. Line Post Insulators Page LP-5 of LP-15