Gas insulated switchgear (Switchgear) | Reliable Power Distribution

XGW-12KV environmental protection gas insulated ring main unit / primary and secondary fusion complete sets of ring main unit

Gas insulated switchgear (Switchgear)

XGW-12 environmental protection gas insulated ring main box, is the pure air / nitrogen (environmental protection gas) ring main unit, current transformer, voltage transformer, automation station terminal (DTU) and indicating instruments installed and debugged into a movable, sealed, moisture-proof and condensation-proof box, so as to realize the integration of the primary and secondary systems in the urban distribution network, shorten the construction period, and greatly improve the reliability of the operation of the urban power grid.

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Feature

The environmental protection gas insulated ring main unit can be used unit cabinet or common box scheme pure air/nitrogen (environmental protection gas) ring main unit, the typical scheme has two in and two out, two in and four out of the cabinet combination, can also be designed and produced according to user requirements of more unit combination of customized ring main unit.

The outer box is made of stainless steel, sprayed cold-rolled plate and GRC, and the outer box of landscape or spray painting can also be produced according to the needs to better integrate with the surrounding environment.

The dimensions and performance indicators of the outdoor environmental protection gas insulated ring main unit meet the requirements of "12,000 volt ring main unit (box) standardized design customized scheme (2019 edition)", GB/T17467 "high voltage/low prefabricated substation" and IEC466: "AC insulated enclosed switchgear and control equipment with rated voltage above 1KV and below 38KV".

The product has the characteristics of low carbon, environmental protection, reliability, safety and compactness.

Parameter

Electricity			Circuit breaker cabinet	Load switchgear
Projects		unit	numeric value
Rated voltage		kV	12
Rated frequency		Hz	50 60
Current rating		A	630 1250
Arc extinguishing method		/	vacuum
Insulation method		/	Pure air/pure nitrogen (Note: Pure air/pure nitrogen refers to the preparation of synthetic high-purity air or nitrogen with a moisture content of less than 15ppm)
Rated power frequency	To the ground, interphased	kV	42
Withstand voltage	Between the fractures	kV	48
Rated for lightning	To the ground, interphased	kV	75
Impulse voltage	Between the fractures	kV	85
Short-term tolerance	Main circuit	kA/s	20/4 25/4
	Ground loop	kA/s	17.4/2
Peak rating	Main circuit	kA	50 63
Withstands currents	Ground loop	kA	43.5
Rated short-circuit closing current (peak)		kA	50 63
Rated short-circuit interrupting current		kA	20 25	/
Rated short-circuit breaking current, breaking times, E2 level		Times	30	/
Circuit breaker unit rated operating sequence		/	0-0.3s-C0-180s-C0	/
Rated cable/line charging breaking tes		/	C2级	/
Out-of-phase ground fault interrupting current		kA	17.4	/
Rated active load breaking current		A	/	630
Rated closed-loop interrupting current		A	/	630
Rated cable charging breaking test		A	/	10
5% rated active load switch breaking current		A	/	31.5
The number of times the ground switch is closed		Times	5 (Note: XGN118C-12, XGN118D-12 series of lower separation height grounding scheme is 2 times)
Loop resistance		μΩ	≤140
Rated gas pressure (20°C gauge)		Mpa	0.02
Minimum operating gas pressure		MPa	0
Mechanical life	Circuit breakers/load switches	Times	10000 30000
	Disconnector	Times	3000 6000
	Grounding switch	Times	3000 6000
Ingress protection	Airbox	/	IP67
	enclosure	/	IP4X
Rated annual air leakage rate		%	0.01
Resistant to internal arc faults		kA/s	20/0.5(20/1) 25/0.5(25/1)
The moisture content in the airbox		ppm	≤150

Environmental conditions of use
1. Ambient temperature: upper limit +55°C, lower limit -40°C.
2. Altitude: no more than 3000m.
3. Relative humidity: the daily average value < 95%, the monthly average value ≤ 90%.
4. Water vapor pressure: daily average ≤ 22kPa; The monthly average ≤ 1.8kPa.
5. Workplace: The surrounding air is not visibly polluted by dust, smoke, corrosive and/or combustible gas, steam or salt spray; There is no fire explosion, serious pollution, serious chemical corrosion and severe vibration.
6. The amplitude of electromagnetic interference induced in the secondary system ≤ 1.6kV.
7. Note: When the altitude is greater than 3000m or under special use conditions, customized product solutions are required.