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SF₆-Free Gas-Insulated RMU

Product Description

The HXGNA-12 type eco-friendly gas-insulated metal-enclosed AC switchgear is a new-generation power distribution switchgear developed based on the national achievement of the ‘dual-carbon’ goals. Its technical characteristics are utilizing synthesized dry air to replace SF₆ gas as the insulating medium, and employing vacuum switches for the switching of load currents and fault currents. The equipment layout features a three-position switch designed at the upper end of the vacuum switch to convert between conduction, isolation, and grounding functions. The prospective grounding short-circuit current of the line is closed by the vacuum switch within the loop, which can effectively prevent arc pollution to the internal environment of the enclosure during the closing process. The overall dimensions, operating sequence, and ‘five-proofing’ interlocks of the ring main unit fully comply with the regulations of the State Grid typical design schemes.

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Product Advantages

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Eco-Gas Insulated

Replacing traditional SF₆ gas with eco-friendly alternatives—such as dry air, nitrogen, or mixed gases—to mitigate the greenhouse effect.

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High Reliability

Featuring high mechanical and electrical performance to ensure long-term stable operation.

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Modular Design

It adopts a modular structure, making it easy to install, maintain, and expand.

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Smart Capabilities

Can be integrated with smart monitoring systems, enabling remote monitoring and fault diagnosis.

SF₆-Free Gas-Insulated RMU

HXGNA-12（紧凑型）

Product Parameter Table

Technical Parameters	12KV Circuit Breaker
Rated Voltage kV	12
Rated Current A	630
Rated Frequency Hz	50
Rated Short-Circuit Breaking Current kA	20
Phase-to-Phase/Phase-to-Ground kV	42
Across the Open Contact kV	48
Phase-to-Phase/Phase-to-Ground kV	75
Across the Open Contact kV	85
Rated Short-Time Withstand Current and Duration kA/s	20/4
Rated Peak Withstand Current kA	50
Rated Short-Circuit Making Current kA	50
Mechanical Life times	20000

DTU Technical Specifications

Item	Configuration
Power Supply	AC/DC220V + Backup Power
	AC/DC110V + Backup Power
Maximum Monitoring Capacity	Digital Input Channels: 105
	AC Analog Input Channels: 56
	DC Analog Input Channels: 2
	Digital Output Channels: 34
	Line/Switch Monitoring Quantity: 16
Communication Interface	2 Ethernet Ports, 4 RS232/RS485 Ports
	DLT634.5101, DLT634.5104, MODBUS, DNP3.0
Relay Protection	Phase-to-Phase Short Circuit and Single-Phase Ground Fault Monitoring
	Three-Stage Three-Phase Overcurrent and Two-Stage Zero-Sequence Overcurrent, Reclosing, Post-Acceleration
Fault Recording	Sampling Frequency: 6.4 kHz, 1128 Points/Cycle
	Configurable Number of Cycles, Comtrade 1999 Standard Format
Historical Data Storage	Event Sequence Recording, Remote Control Operation Recording
	Load Curve, Fixed-Point and Extreme Value Recording
	Fault Recording Data
Information Security	Dedicated Security Chip Hardware Encryption
	X.509 Standard Format SM2 Digital Certificate
Performance Indicators	Analog Accuracy: Voltage/Current 0.5%, Others 1%
	Remote Signal Resolution: 2 ms

Product Dimensions and Packaging

Name	Equipment Dimensions
Equipment Dimensions	150011002000
Packaging Method	Wood-Steel Edge Box
Packaging Dimensions (mm)	190015002200
Packaging Weight (kg)	650
Eco-Friendly Gas-Insulated Ring Main Unit (Example: Three-Compartment Combined Cabinet)	20ft Container Capacity LWH: 5.892.392.69m
	40ft Container Capacity LWH: 12.032.352.69m

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