Product Specifications:

Overall Model Explanation

• EZH-12： 12kV Dry air /  High-purity nitrogen, an environmentally friendly gas-insulated switchgear (without …) SF₆ )
• (V 、 V 、 PT) : Three-Unit Combination Cabinet = 2 Line-in/line-out unit for vacuum circuit breakers (V)+1 Line bus voltage transformer PT Measurement and Monitoring Unit
• 630 : One-time busbar rated current 630A；20 Rated short-time withstand current 20kA/4s
• KE-7120-B : Colin Electric Standardized Centralized DTU Substation terminal, fully integrated with primary and secondary equipment, compliant with State Grid’s “three-remote” standard configuration.

Basic parameters of an environmentally friendly gas-insulated switchgear

KE-7120-B DTU Terminal Parameters

Application scenarios:

1. Urban municipal switchgear stations and cable ring network nodes   Dual circuit breakers enable bidirectional power supply in a ring network. PT Complete busbar voltage monitoring, DTU Upload data to the distribution network master station to enable rapid isolation of line faults and restoration of power to non-faulted sections.
2. Industrial and commercial parks, factory premises 10kV Distribution Room   The two incoming feeders serve as backups for each other, PT It provides metering and protection voltage signals, features integrated primary–secondary functionality, eliminates on-site secondary wiring installation, and shortens the commissioning cycle of the distribution room.
3. Critical loads such as data centers, hospitals, and large commercial complexes   Relying on circuit breakers to quickly clear short-circuit faults, DTU Remote monitoring of operating status enhances power supply continuity; environmentally friendly gas-free. SF₆ Asphyxiation risk; suitable for the enclosed environment of indoor switchgear rooms.
4. Underground utility tunnels, tunnels, and electrical distribution facilities for underground parking garages   The fully sealed gas-insulated switchgear is resistant to moisture, water accumulation, and dust contamination. Its integrated, packaged design occupies a small footprint, making it well-suited for compact underground distribution spaces.
5. Switching stations supporting distributed photovoltaic and wind power projects   It monitors and aggregates line voltage and current, detects photovoltaic grid‑connection faults, and collaborates with the master station to implement grid‑connection protection and feeder automation control.
6. Old Distribution Network Intelligent Upgrade Project   The factory has completed the primary and secondary integrated assembly and commissioning, leaving only a single cable connection and communication interface on site, thereby significantly reducing the on-site installation and commissioning workload.

Product Advantages:

Single-cabinet design: environmentally friendly + highly reliable and maintenance-free

1. None SF₆ Environmental Protection Plan : Use dry air / Nitrogen insulation, zero greenhouse gas emissions, compliance with dual-carbon goals and grid‑level environmental procurement requirements, and no need for gas recovery or treatment upon equipment decommissioning.
2. Fully sealed stainless steel air tank : All live components are fully sealed within the enclosure, effectively isolating them from moisture, salt spray, small animals, and condensation, ensuring stable long-term operation in harsh environments; laser-welded gas chamber 30 Annual free gas-replenishment maintenance.
3. Comprehensive Security Protection : Standard equipment includes a mechanical five‑point interlock to prevent misoperation, and a built-in directional pressure‑relief channel that directs the release of internal arc faults, ensuring the cabinet will not rupture.
4. Compact modular structure ： V+V+PT The three-unit integrated arrangement occupies less floor space and reduces civil engineering costs compared to a split-type switchgear cabinet.

4.2 KE-7120-B DTU: Standardized Intelligent Integration, Compatible with State Grid Specifications

1. OEM-matched integrated design : A current transformer and DTU Factory‑calibrated integration resolves on-site mismatches between primary and secondary parameters and untidy wiring, clarifies responsibility boundaries, and facilitates operation, maintenance, and troubleshooting.
2. Advanced Feeder Automation FA Ability : Accurately detects phase-to-phase short circuits and high‑impedance ground faults, achieves fault isolation within hundreds of milliseconds, rapidly restores power to non‑faulted areas, and minimizes the scope of outages.
3. Multi-mode communication networking : Supports fiber optic, wireless, 5G Slice-based transmission, with low-latency data upload and scheduling at the master station, supports both local manual and remote telecontrol modes.
4. High-Stability Industrial Hardware : Full-loop electrical isolation, high strength EMC Anti-interference, wide-temperature operation, and suitable for long-term, uninterrupted use inside indoor and outdoor enclosures.

4.3 Comprehensive Integrated System Advantages

1. Factory‑ready as a complete set, ready to install and use. : One switch, PT 、 DTU All secondary wiring is assembled, commissioned, and tested to acceptance standards at the factory before leaving the premises, thereby reducing on-site installation work. 70% That’s all—delivery is fast.
2. Unified Operations and Maintenance Management : All primary equipment status, gas pressure data, switch positions, and electrical quantity data are aggregated to DTU Centralized uploading enables operations and maintenance personnel to interface with a single intelligent system, ensuring standardized management.
3. Lower total lifecycle cost : Maintenance-free once + Secondary intelligent centralized monitoring reduces the frequency of manual inspections and outage‑related maintenance, resulting in a substantial decrease in overall operations and maintenance costs.