Medium-voltage transformer bushing

Main product features

• The primary-secondary integrated bushing combines a voltage sensor, a current sensor and a power pickup module into the bushing to achieve a compact, integrated design.
• Adopts a mainstream rear-insertion modular structure: voltage sensor and pickup unit share uniform dimensions and appearance for good interchangeability and easy replacement; high casting yield for finished bushings.
• The voltage sensor uses a capacitive divider scheme with no ferromagnetic resonance, providing high accuracy and good consistency.
• The current sensor uses an LPCT dual-coil design with independent zero-sequence synthesis; accuracy meets State Grid standardized 1S class requirements.
• Embedded equipotential shielding ensures excellent insulation performance; partial discharge per single bushing <3 pC (1.2Ur), whole device <10 pC (1.2Ur).

Main technical parameters
Rated voltage ratio: Phase voltage: (10kV/√3)/(3.25V/√3); Zero-sequence: (10kV/√3)/(6.5V/3)
Accuracy class: Phase voltage: 0.5 class; Zero-sequence voltage: 3P
Rated load: 2 MΩ ±5%
Rated transformation ratio: Phase: 600A/1V; Zero-sequence: 20A/0.2V
Rated primary voltage: 10/√3 kV (capacitive pickup unit)
Secondary output voltage: DC27V
Pickup power: 6W–8W

Features / Technical specifications

• Integration of voltage sensor, current sensor and pickup module for a compact, unified product design.
• Rear-insertion modular structure for easy maintenance and high interchangeability.
• Voltage measurement via capacitive divider for stable performance and high accuracy.
• Current measurement via LPCT dual-coil design, compliant with State Grid 1S accuracy standards.
• Embedded equipotential shield for superior insulation and low partial discharge characteristics.