ZW8-12(G) Outdoor High-Voltage Vacuum Circuit Breaker

Product Overview

The ZW8-12(G) series outdoor AC high-voltage vacuum circuit breaker is a reliable switching device designed for power distribution automation. It can be integrated with various control units and is widely used in secondary network transformation projects. The breaker can also function as a recloser, providing dependable protection and automation support for distribution systems.

ZW8-12(G) Outdoor High-Voltage Vacuum Circuit Breaker

Key Technical Parameters

No.	Item	Unit	Parameter
1	Rated Voltage	kV	12
2	Rated Current	A	630
3	Lightning Impulse Withstand Voltage (Peak)	kV	-
4	Rated Switching Endurance	Times	-
5	Opening Time	ms	5
6	Closing Bounce Time	ms	≤2
7	Opening/Closing Synchronism	ms	≤2
8	Built-in Current Transformer Ratio	-	10/0.22
9	Control Voltage	V	-220

Main Features

1. Core Protection and Control Functions

• Microcomputer Protection:
Equipped with three-stage current protection, including instantaneous, definite-time, and inverse-time overcurrent protection. Users can flexibly configure the protection values and time delays based on system requirements.

• Reclosing Function:
Supports up to three automatic reclosing operations, with adjustable reclosing intervals and acceleration sequences. It offers pre- and post-reclosing acceleration options for improved coordination.

• Network Reconfiguration:
In a ring network system it provides distributed intelligent control. In case of a fault, it automatically isolates the fault area and restores power supply to non-faulty sections. It includes functions such as undervoltage tripping lockout, automatic reclosing, delayed reclosing, automatic reset, and alternative protection settings.

• Measurement Function:
Measures voltage, current, and other electrical parameters while recording operational data and events for analysis.

• FTU (Feeder Terminal Unit):
Implements the four remote functions—remote control, remote measurement, remote signaling, and remote setting. Supports remote operation, condition monitoring, data display, and parameter adjustment.

• Communication Interface and Protocol:
Equipped with one standard data interface supporting multiple communication methods such as fiber optic, cable, and wireless. It can serve as a remote terminal for power distribution automation systems.

• Remote Control:
An optional wireless remote controller allows safe, short-range operations for opening and closing.

• Backup Battery:
An optional built-in battery maintains normal operation for up to 12 hours after AC power loss.

• Dual Power Switching Function:
Provides automatic dual power supply transfer control with features such as delayed closing, delayed opening after power failure, output-side voltage interlock, and dual-side switch position interlocking.

2. Additional Intelligent Functions

The ZW8-12(G) series includes multiple protection and automation functions:
• Instantaneous and overcurrent protection
• Three-time automatic reclosing
• Event recording and anti-inrush protection
• Zero-sequence protection
• Real-time clock and operational status monitoring
• Local and remote parameter setting
• Fault self-reporting and GSM message alerts
• Smart handheld terminal operation

Environmental Conditions

• Altitude: ≤2000 m
• Ambient Temperature: -40°C to +80°C
• Average Annual Temperature: 20°C; daily average 30°C
• Seismic Resistance: Horizontal acceleration 0.3g; vertical acceleration 0.15g (three sine waves, safety factor 1.67)
• Climatic Conditions:

Maximum daily temperature difference: 25°C
Solar radiation: 0.1 W/cm² (at wind speed 0.5 m/s)
Maximum wind speed: ≤25 m/s
Maximum ice thickness: 10 mm
• Installation Site: Outdoor use, free from flammable, explosive, or corrosive environments, and severe vibrations
• Neutral Grounding Methods:
Ungrounded neutral system
Arc-suppression coil grounding
Low-resistance grounding

Applications

The ZW8-12(G) vacuum circuit breaker is ideal for urban and rural power distribution networks, particularly in areas where the grid structure is weak, load fluctuations are significant, or voltage regulation precision is high. It is widely used in industrial plants, substations, airports, ports, and municipal power systems requiring reliable and intelligent distribution automation.