Product Overview
The TG2-10Q/182 (152×152) Bushing is an indoor epoxy resin high-voltage wall bushing manufactured as an integrated cast structure using the APG pressure gelation process.
It is designed for three-phase AC power systems rated at 10 kV and below. The bushing allows conductive busbars or cables to pass through grounded switchgear partitions, walls, and similar structures while providing electrical insulation, mechanical support, and conductor connection.
It is widely used in withdrawable switchgear, ring main units, and other complete power distribution equipment.
Model Description
| Model Code | Description |
|---|---|
| TG2 | Second-generation wall bushing series for withdrawable switchgear |
| 10Q | Rated voltage of 10 kV; Q indicates an indoor type |
| 182 | Parameter related to the creepage distance or structural height of the bushing body |
| 152×152 | Square mounting flange dimensions, 152 × 152 mm |
Technical Specifications
Electrical Parameters
| Parameter | Specification |
|---|---|
| Rated Voltage | 10 kV, suitable for systems rated from 10 to 35 kV |
| Rated Frequency | 50/60 Hz, suitable for systems from 15 to 60 Hz |
| Rated Insulation Level | 12/42/75 kV, rated voltage/power-frequency withstand voltage/lightning impulse withstand voltage |
| Power-Frequency Withstand Voltage | 42 kV for 1 minute under dry conditions |
| Lightning Impulse Withstand Voltage | 75 kV peak |
| Partial Discharge | ≤5 pC at rated voltage |
| Creepage Distance | ≥182 mm |
Structural and Dimensional Parameters
| Parameter | Specification |
|---|---|
| Mounting Flange Dimensions | 152 × 152 mm, square |
| Overall Height | 260 mm |
| Inner Opening Diameter | Suitable for standard busbars used in 10 kV withdrawable switchgear, typically approximately Ø100 mm |
| Shed Structure | Double shed groups at the upper and lower ends to improve surface insulation |
| Material | Glass-fibre-reinforced epoxy resin |
| Colour | Standard epoxy resin red; customizable |
Mechanical and Environmental Parameters
| Parameter | Specification |
|---|---|
| Flexural Strength | ≥120 MPa |
| Compressive Strength | ≥150 MPa |
| Operating Temperature Range | -40°C to +120°C for long-term operation |
| Flame-Retardant Rating | UL94 V-0 |
| Moisture and Pollution Resistance | Excellent, suitable for humid and dusty indoor environments |
Product Features
Excellent Insulation Performance
The bushing is integrally cast using the APG process, producing a dense structure without bubbles or visible defects.
It provides high dielectric strength and extremely low partial discharge, helping reduce the risk of surface flashover and maintain stable insulation performance.
High Mechanical Strength
The glass-fibre-reinforced epoxy resin structure provides excellent bending, compression, and impact resistance.
It can withstand busbar installation stress and the electrodynamic forces generated under short-circuit conditions.
Strong Environmental Adaptability
The product provides reliable resistance to moisture, contamination, high temperatures, and low temperatures.
No special maintenance is normally required. Periodic cleaning of the insulating surface is sufficient under standard operating conditions.
Optimized Structural Design
The double-shed structure increases the creepage distance and improves surface insulation performance.
The square mounting flange is compatible with standard switchgear openings, providing convenient installation and reliable sealing.
Safe and Environmentally Responsible
The product complies with RoHS environmental requirements and contains no toxic or hazardous substances.
Under standard operating conditions, its expected service life is at least 30 years.
Applications
Applicable Equipment
The product is suitable for indoor power distribution equipment rated at 10 kV and below, including:
- KYN28 withdrawable switchgear
- Ring main units
- Box-type substations
- Switchgear partitions
- Power distribution room walls
- Other indoor medium-voltage electrical assemblies
Main Functions
- Electrical insulation where conductive busbars or cables pass through grounded partitions or walls
- Mechanical support and fixation of busbars
- Transitional busbar connections inside or between switchgear cabinets
- Insulation separation between live conductors and grounded structures
- Conductor support in complete power distribution equipment
Applicable Systems
The bushing is suitable for three-phase AC power systems with a rated frequency of 50/60 Hz, including:
- Power stations
- Substations
- Industrial power distribution rooms
- Commercial and infrastructure power distribution systems
Operating Conditions
Normal Operating Conditions
- Ambient temperature: -5°C to +40°C
- Daily average ambient temperature: no more than +35°C
- Installation altitude: no more than 1,000 m
- Daily average relative humidity: no more than 95%
- Monthly average relative humidity: no more than 90%
- Condensation is not permitted
- Indoor installation only
- The environment should be free from severe pollution
- Corrosive gases are not permitted
- Flammable or explosive substances are not permitted
- Severe vibration and mechanical impact should be avoided
Special Operating Conditions
Customized products are required under the following conditions:
- Installation altitude above 1,000 m, with insulation correction according to GB/T 11022
- Ambient temperatures outside the range of -5°C to +40°C
- Severe pollution or salt-spray environments
- Chemically corrosive environments
- Applications involving severe vibration or mechanical impact
Installation and Maintenance
Installation Requirements
- Pre-installation inspection: Confirm that the bushing is free from cracks, damage, bubbles, and other visible defects. Check that the flange is flat and that the dimensions meet the installation requirements.
- Installation method: Insert the bushing through the switchgear partition or wall and secure the flange with bolts. Ensure that the sealing gasket, where provided, is correctly installed to prevent air movement between switchgear compartments.
- Busbar installation: Pass the busbar through the inner opening. Ensure that the busbar does not contact the inner wall or apply mechanical stress to the bushing. Maintain sufficient and even insulation clearance.
- Grounding requirements: The mounting flange must be reliably connected to the switchgear enclosure or grounded wall structure. The grounding resistance must comply with the applicable requirements.
Maintenance Requirements
- Routine maintenance: No special maintenance is normally required. Clean dust and contamination from the bushing surface every 6 to 12 months to keep the insulating surface clean and dry.
- Periodic testing: During scheduled switchgear maintenance, conduct insulation resistance and power-frequency withstand voltage tests to confirm that the insulation performance remains acceptable.
- Replacement conditions: Replace the bushing immediately if cracks, mechanical damage, severe contamination, or reduced insulation performance are found.
Applicable Standards
- GB/T 12944.1, High-Voltage Wall Bushings—Part 1: Porcelain and Glass-Fibre Bushings
- GB/T 11022, Common Specifications for High-Voltage Switchgear and Controlgear Standards
- IEC 60137, Insulated Bushings for Alternating Voltages Above 1,000 V
- JB/T 10686, Indoor Epoxy Resin Cast Wall Bushings for 1 kV to 35 kV Systems
Precautions
- This product is intended for indoor use only and must not be installed directly in exposed outdoor environments.
- Avoid severe impact, dropping, and rough handling during installation and transportation to prevent cracking.
- Do not drill, cut, or otherwise machine the bushing surface, as this may damage the insulating structure.
- For high-altitude, high-temperature, corrosive, or other special operating conditions, inform the manufacturer in advance so that a customized product can be supplied.
- Store the product in a dry, ventilated environment free from corrosive gases and protect it from moisture.
