Product Overview
The HXGN15-12 series fixed metal-enclosed switchgear (referred to as "Ring Main Unit" for short) is suitable for AC 50Hz, 10kV power grids. It is used for breaking load current and short-circuit current, as well as closing short-circuit current.

This ring main unit is equipped with a spring operating mechanism, enabling both electric and manual operation of the load switch. The earthing switch and disconnector are equipped with manual operating mechanisms.

It is widely applied in power distribution systems requiring high power supply reliability, such as urban commercial centers, industrial concentration areas, airports, electrified railways, and expressways. It can be used independently indoors or outdoors, and can also be integrated into prefabricated substations.
Model and Its Meaning

Main Features
1、The switchgear is equipped with reliable "five-prevention" functions, and a live display device is installed on the cabinet.
2、The enclosure protection class is not lower than IP2X.
3、Each cabinet is provided with a wiring diagram simulation on its front panel, which clearly reflects the configuration of primary components in the switchgear.
4、It is assembled from high-quality galvanized steel plates and divided into a busbar chamber, a switch chamber, a cable chamber, and an instrument chamber. Each chamber is relatively independent and equipped with a pressure relief channel.
5、Two sets of dedicated installation and commissioning tools are provided.
6、All components in the HXGN15-12 series ring main unit comply with the requirements of relevant national standards.
7、Valid type test reports and product certification certificates for the product are provided.
8、Upon delivery, certificates of conformity and test reports for all electrical components in the switchgear are provided.
Main Technical Parameters

Name	Unit	Parameter
Rated Voltage / Maximum Operating Voltage	KV	10/12
Rated Current	A	630
Main Busbar Current Incoming Line Cabinet Outgoing Line Cabinet (Combined Electrical Appliance)	A	630 125
Rated Short-Time Withstand Current	KA	20
Rated Short-Circuit Duration	S	4
Rated Peak Withstand Current	KA	50
Rated Short-Circuit Making Current	KA	50
Rated Active Load Breaking Current	A	630
Closed-Loop Breaking Current	A	630

Rated Cable Charging Breaking Current	KA	20
Rated Short-Time Withstand Current of Earthing Switch	KA	20
Rated Short-Circuit Duration of Earthing Switch	S	4(2)
Rated Peak Withstand Current of Earthing Switch	KA	50
Rated Short-Circuit Making Current of Earthing Switch	KA	50

1-minute Rated Power-Frequency Withstand Voltage	Between Phases, Phase-to-Earth, Vacuum Load Switch Interrupting Gap	KV	42
	Disconnector Interrupting Gap		48
Rated Lightning Impulse Withstand Voltage	Between Phases, Phase-to-Earth, Vacuum Load Switch Interrupting Gap Disconnector Interrupting Gap	KV	75 85
Mechanical Life	Vacuum Load Switch Earthing Switch (Blade), Disconnector (Blade)	time	10000 2000

Making Current

A

3150

Structure and Working Principle
It is mainly equipped with the ZFN-10 type vacuum load switch, and the main configurations include incoming line cabinets and outgoing line cabinets.

1、Incoming Line Cabinet Configuration: The main circuit inside the cabinet consists of one ZFN-10 type vacuum load switch, which is equipped with an isolating switch and optionally an earthing switch (depending on requirements). These three components are mounted on a single frame and interlocked with each other. Thus, it can realize operations for three working positions: busbar connection, isolation, and earthing. Components such as current transformers (CT) and potential transformers (PT) can also be flexibly installed inside the cabinet.
2、Outgoing Line Cabinet Configuration: The main circuit inside the cabinet consists of one ZFN-10 type vacuum load switch, a fuse with an impactor (serving as an isolating switch), and an earthing switch. It can also realize three-position operations. Components such as current transformers (CT), potential transformers (PT), and ZNO arresters can be flexibly installed inside the cabinet. Therefore, the metering cabinet can sometimes be omitted.
Outline and Installation Dimensions of HXGN15-12 Ring Main Unit

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