High Voltage Insulation Sheets
Bus Sheet GMHS & GHHS is an adhesive coated heat shrinkable sheet, which provides insulation enhancement & protection against accidentally induced discharge. It is suitable to insulate almost any sizes or shapes of busbar joint like busbar tees, elbows and other connections where tubing and tape can not be used.
After applying heat, this sheet shrinks to tightly conform to complicated shapes. Gala mastic tape can also be added to ensure that protruding shapes are insulated. The sheet is manufactured from high quality non tracking crosslinked polyolefin material & meets ANSI C37.20.2 standards for MV application upto 36KV. GMHS sheet shall provide flashover protection up to 17.5KV. & GHHS sheet shall provide protection up to 36KV.
Standards
- Easy to install on site using a gas torch or hot air gun.
- Prevents Busbar from chemical corrosion effected by strong acid, alkali, salt, etc.
- Halogen free, flame retardant.
- High dielectric strength.
- Excellent UV & weather resistant properties, & hence suitable for indoor or outdoor use.
- Reduces BusBar Clearance.
- No Special Mould / Tool required.
Diagram
Technical Specification
| Test Description | Recorded Value | Test Method |
|---|---|---|
| Physical | ||
| Tensile Strength | 12 N/mm² (MPa) (min.) | ASTM D638 |
| Ultimate Elongation | 300% (min.) | ASTM D638 |
| Water Absorption | 0.5% (max.) | ASTM D570 |
| Hardness | 45 ± 10 Shore D | ASTM D2240 |
| Thermal | ||
| Accelerated Ageing | 120°C for 500 Hrs. | ASTM D2671 |
| Tensile Strength | 10 N/mm² (MPa) (min.) | ASTM D638 |
| Ultimate Elongation | 250% (min.) | ASTM D638 |
| Low Temp. Flexibility (-40°C for 4 Hrs.) | No Cracking | ASTM D2671 |
| Heat Shock (250°C for 30 Min.) | No Cracking or Flowing | ESI 09-11 |
| Shrink Temperature | 125°C | IEC 216 |
| Continuous Temp. Limit | -40°C to +105°C | IEC 216 |
| Electrical | ||
| Dielectric Strength | 22 KV/mm. (min.) | ASTM D149 |
| Volume Resistivity | 1 x 10¹⁴ Ohm.cm (min.) | ASTM D257 |
| Dielectric Constant | 5 (max.) | ASTM D150 |
| Resistant to Track & Erosion | No Tracking, erosion or flame failure up to 3.25 KV for 20 min. | ASTM D2303 |
Clearances with Insulation
| Voltage | Medium Wall Sheet (GMHS) | Heavy Wall Sheet (GHHS) | Extra Heavy Wall Sheet (GEHHS) | UN-Insulated Bus Bars | |||
|---|---|---|---|---|---|---|---|
| Ph. to Ph. (mm) | Ph. to Gr. (mm) | Ph. to Ph. (mm) | Ph. to Gr. (mm) | Ph. to Ph. (mm) | Ph. to Gr. (mm) | ||
| 12 KV | 65 | 75 | 35 | 45 | – | – | 120 |
| 17.5 KV | 85 | 105 | 55 | 65 | – | – | 160 |
| 24 KV | 115 | 150 | 70 | 100 | – | – | 220 |
| 36 KV | 200 | 285 | 140 | 190 | – | – | 320 |
| 66 KV | – | – | – | – | 390 | 520 | 630 |
Product Selection
| Tube Size | Busbar Width (mm) | No. of Busbar Run | Cut Size Needed | GMHS (11 kV) Thickness (mm) | GHHS (36 kV) Thickness (mm) | GEHHS (66 kV) Thickness (mm) | No. of Installation Per Sheet | Length (mm) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A (min.) | For T Joint | For L Joint | For T Joint | For L Joint | |||||||
| B (min.) | B (min.) | ||||||||||
| 65/45 | 25 | 1 | 205 | 85 | 85 | 1.5 | 2.3 | 3.5 | 14 | 14 | 1200 |
| 95/60 | 50 | 1 | 295 | 130 | 120 | 1.5 | 2.3 | 3.5 | 9 | 10 | 1200 |
| 120/70 | 75 | 1 | 345 | 150 | 150 | 1.5 | 2.3 | 3.5 | 8 | 8 | 1200 |
| 150/110 | 100 | 1 | 455 | 240 | 200 | 1.5 | 2.3 | 3.5 | 5 | 6 | 1200 |
| 180/110 | 150 | 1 | 555 | 300 | 240 | 1.5 | 2.3 | 3.5 | 4 | 5 | 1200 |
Note : The above table should be used as a guideline only. Please try with one or two joints before adopting final cut size. The busbars are assumed to be insulated to 25mm. from the joint. Cut size should extend minimum of 100mm. on each leg of the joint before shrinking and should overlap existing insulation by 65mm. after shrinking.
Ordering Information
| Optional Components | Length (mm) |
|---|---|
| Void Filling Mastic Piece | 300 |
| Sealant Filling Mastic Piece | 300 |
| Tool Kit | (Basic Clamp & Bracket Kit) |
Note : If required, one piece of Red sealing mastic is applied on each leg of the joint and one or two pieces of Black sealing mastic is used to cover uneven shapes.
Certificates
FAQs
1. What is a Screened Separable Connector?
A Screened Separable Connector is a medium-voltage cable accessory used to connect power cables to transformers, switchgear, or other equipment. It is fully screened and separable, allowing safe installation, disconnection, and maintenance.
2. What voltage levels are Screened Separable Connectors used for?
They are commonly used for 3.6 kV to 36 kV medium-voltage applications, depending on the connector design and standards.
3. Where are Screened Separable Connectors typically used?
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