72.5kV – 252kV Dry-Type Capacitive Wall Bushing for Transformers

Our Dry-Type Capacitive Wall Bushings are engineered for power stations and substations, providing a high-performance solution for conductors passing through grounded partitions or walls while maintaining superior insulation to ground.

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72.5kV – 252kV Dry-Type Capacitive Wall Bushing for Transformers

Electrical Products

Features
Technical Specifications
Ordering Instructions

Core Engineering Advantages of Dry-Type Capacitive Wall Bushings

Insulation Technology: Utilizes dry-type capacitive cores for stable electric field distribution without the risk of oil leakage.

Voltage Range: Specifically designed for system voltages including 72.5kV, 126kV, and 252kV.

Mechanical Integrity: Certified for bending test loads up to 5000 N for 252kV/2000A configurations.

Dielectric Performance: Maintains a low dielectric loss tangent (tan δ) of ≤ 0.6% and partial discharge levels ≤ 10pC at 1.05Ur/√3

Technical Specifications & Performance Data of Dry-Type Capacitive Wall Bushings

These bushings are tested to meet rigorous international standards for electrical and mechanical endurance.

Table I: Electrical Performance of Dry-type Capacitive Wall Bushings

Nominal System Voltage (Un) kV		110	220	330	420	500
Rated Voltage (Ur) kV		126	252	363	420	550
Highest Phase Voltage of Equipment (Ur/√3) kV		73	146	210	242	317
60s Power-Frequency Withstand Voltage	Dry kV (r.m.s)	230	460	570	695	870
60s Power-Frequency Withstand Voltage	Wet kV (r.m.s)	230	460	535	680	790
Lightning Impulse Withstand Voltage	Full Wave kV (Peak)	550	1300	1425	1425	1800
Dielectric Loss Angle Tangent %	Max Value (Not Greater Than) 40.5kV ~ 363kV	1.05Ur/√3 -Ur: 0.1
Dielectric Loss Angle Tangent %	Max Value (Not Greater Than) 420kV ~ 550kV	1.05Ur/√3 · Measured: 0.6
Partial Discharge at U_r (Not Greater Than) pC		10

Table II: Bending Test Load Table

Rated Voltage Ur (kV)	Rated Current Ir A
	Ir ≤ 800	800 < Ir ≤ 1600	2000 ≤ Ir
	Bending Test Load N (N)
126	2000	2000	4000
252	4000	4000	5000

Overall Dimensions

Why Specify Our Dry-Type Bushings?
Unlike traditional oil-impregnated paper (OIP) bushings, our dry-type capacitive technology eliminates explosion risks and environmental hazards from oil leaks. With a focus on technical precision, we ensure that every unit meets specific creepage distance and withstand voltage requirements for diverse global climates, including high-pollution environments