Model: 12kV SPT-CT-10/630-202 Rated current: 630A Material: Epoxy resin Application: SF6 Ring main unit Bushing model: EN50180 & 50181 Type“C” Execution Standards: IEC60502.4, GB/T12706.4

Product Introduction

• The SPT-CT-10/630-202 epoxy bushing is tailor-made for 12kV gas-insulated ring main units used by the Southern Power Grid. Manufactured via monolithic high-strength epoxy resin casting, this bushing integrates an embedded shielding induction network that facilitates grounding shielding and connection to live display indicators. It provides stable, secure mounting and electrical interconnection for cable elbow connectors and copper busbars. With a rated current of 630A, it is fully compatible with the layout of 12kV SF6 gas-insulated switchgear.
• All raw materials undergo strict aging validation testing. Its design service life aligns with the full lifespan of the ring main unit, requiring no regular maintenance under rated operating conditions. This significantly cuts the total lifecycle operational costs for customers. 

Product Features

• 1. Excellent Mechanical Strength

Monolithic epoxy casting body owns outstanding rigidity and crack resistance. It can bear huge electrodynamic force generated by normal operation and short-circuit current without deformation or damage. Stable dimensional stability under temperature fluctuation and long-term mechanical stress, enduring 50N·m standard tightening torque permanently.

• 2. Outstanding Environmental Adaptability

Jujube red epoxy shell has premium moisture-proof, salt-spray resistant, UV-resistant and hydrophobic performance. It fits high-temperature, high-humidity and heavily polluted indoor & outdoor power distribution environments. The low-contamination surface maintains stable insulation performance for long-term maintenance-free running.

• 3. Optimized Cable Interface Design

Tapered lower terminal perfectly matches T-type elbow cable connectors. Internal silver-plated conductive rod brings ultra-low contact resistance and stable connection. Plug-in force is precisely calibrated; operators can carry out safe live plugging & unplugging with special tools.

• 4. Strict Hermetic & Internal Quality Control

1. Mass spectrometer air tightness inspection before delivery, leakage rate ＜1Pa·cm³/s, avoiding SF6 gas leakage of gas insulated switchgear;
2. No shrinkage cavities, cracks or stress concentration inside casting; smooth & clean outer surface without dark spots, texture marks and mechanical scratches;
3. M16 conductive thread with silver plating thickness ≥3μm, stable conductive performance.

Electrical & Mechanical Technical Parameters 

Key Overall Dimensions

• Total height: 202mm
• Copper inner diameter：Φ30-20-25
• Max flange outer diameter: Φ97

Factory Full Inspection Items

1. Visual appearance inspection: scratch-free exterior, no internal shrinkage cavities or cracks
2. Mechanical torque durability test: 50N·m long-term tightening test
3. Power frequency withstand voltage test: 45kV / 1min without breakdown & flashover
4. Partial discharge test: ≤3pC at 14.4kV
5. Capacitance measurement: controlled within 18±3pF
6. Silver plating thickness test for M16 thread: ≥3μm
7. Mass spectrometer air tightness leakage test: leakage rate ＜1Pa·cm³/s
8. Lightning impulse withstand test: 85kV, ±10 impulses

Matching & Selection Remarks

1. Extended derivative model: SPT-CT-10/630-202 (1250A high-current version)
2. Supporting accessories: cable elbow connectors, live display sensors, grounding shielding components can be supplied as complete sets
3. Product advantage compared with standard OM303 bushing: stricter partial discharge and air tightness indicators, customized for Southern Power Grid engineering standards