Product Overview

The ZCW10-40.5L(G) Outdoor Open-Type SF₆ Gas-Insulated Switchgear (GIS) is an integrated high-voltage switching solution designed for 40.5kV, 50Hz three-phase AC power systems. It utilizes air as the external insulation medium and SF₆ (Sulfur Hexafluoride) gas for arc interruption and internal insulation, providing excellent switching performance, compact installation, and high operational reliability.

The complete assembly integrates an SF₆ circuit breaker, disconnect switch, earthing switch, built-in current transformers (optional), steel support frame, and control cabinet into a factory-assembled unit, significantly reducing installation time and substation footprint.

It is an ideal solution for urban substations, industrial power distribution systems, renewable energy substations, and space-constrained power facilities.

Model Designation

Code	Description
Z	SF₆ Circuit Breaker
C	Open-Type Combined Switchgear
W	Outdoor Type
10	Design Series
40.5	Rated Voltage (40.5kV)
T	Spring Operating Mechanism
3150	Rated Current (3150A)
40	Rated Short-Circuit Breaking Current (40kA)
L(G)	Customized Structure with Enhanced Corrosion Protection

Key Features

Integrated Compact GIS Design

The ZCW10-40.5L(G) combines multiple primary components into one compact outdoor assembly, including:

SF₆ Circuit Breaker
Disconnect Switch
Earthing Switch
Built-in Current Transformers (Optional)
Steel Support Base
Secondary Control Cabinet

The factory pre-assembled design minimizes on-site installation work, requiring only foundation fixing and electrical connections before commissioning.

High-Performance SF₆ Circuit Breaker

The switchgear incorporates a compact dead tank SF₆ circuit breaker equipped with a CT35 spring operating mechanism.

Features include:

Factory-adjusted operating mechanism
Stable opening and closing performance
Mechanical life exceeding 10,000 operations
Suitable for frequent switching applications

Advanced Self-Blast Arc Interruption Technology

The breaker adopts a self-blast compressed-gas arc extinguishing chamber, delivering outstanding interruption performance.

Key advantages include:

Rated short-circuit breaking current up to 40kA
Up to 12 full short-circuit interruptions at 40kA
No restrike when switching unloaded transmission lines up to 50 km
Excellent performance for cable circuits and capacitor bank switching

Reliable SF₆ Gas Sealing System

The gas tank is designed with premium sealing technology to ensure long-term operational reliability.

Features include:

Imported sealing gaskets
V-type spring compensation seals
Annual SF₆ leakage rate ≤ 0.5%
Integrated SF₆ gas density monitoring device
Total SF₆ gas charge approximately 8 kg

The advanced sealing system maintains stable insulation and arc-quenching performance throughout the equipment's service life.

Integrated Current Transformer Solution

Optional built-in current transformers eliminate the need for external CT installation.

Advantages include:

Up to 12 built-in CTs
Nanocrystalline alloy magnetic cores
Metering accuracy up to Class 0.2 / 0.2S
Reduced substation footprint
Simplified installation
Lower overall project cost

Three-Position Mechanical Interlocking

The integrated disconnect switch and earthing switch provide:

Closed position
Open position
Grounded position

A mechanical interlocking system prevents incorrect operating sequences, significantly improving personnel safety during maintenance.

Technical Specifications

Electrical Ratings

Item	Specification
Rated Voltage	40.5kV
Rated Frequency	50Hz
Rated Current	2000A (3150A Optional)
Lightning Impulse Withstand Voltage	185kV
Power Frequency Withstand Voltage (1 min)	95kV
Rated Short-Circuit Breaking Current	40kA
Rated Peak Withstand Current	100kA
Rated Short-Time Withstand Current (4 s)	40kA
Rated Out-of-Phase Breaking Current	10kA
Capacitor Bank Switching Current	400A
Operating Sequence	C–0.3s–CO–180s–CO
Mechanical Life	≥10,000 Operations
SF₆ Rated Filling Pressure (20°C)	0.50 MPa
Alarm / Lockout Pressure	0.45 MPa
Annual SF₆ Leakage Rate	≤0.5%
SF₆ Moisture Content	≤150 × 10⁻⁶ V/V
Total Weight	Approx. 1400 kg

Mechanical Performance

Item	Specification
Total Contact Travel	95 ±2 mm
Contact Separation	60 ±1.5 mm
Pole Opening Synchronization	≤2 ms
Phase Opening Synchronization	≤3 ms
Main Circuit Resistance	≤120 μΩ
Closing Speed	3.2 ±0.2 m/s
Opening Speed	3.4 ±0.2 m/s
Closing Time	≤0.15 s
Opening Time	≤0.06 s

Operating Mechanism

Item	Specification
Trip/Close Coil Voltage	DC110V / DC220V
Energy Storage Motor Voltage	AC/DC110V, AC/DC220V
Motor Operating Voltage Range	85%–110% Rated Voltage
Energy Storage Time	<15 s
Motor Rated Current	5 A