China GN30-12(D) Rotary Indoor High-Voltage Disconnector Manufacturer, Factory

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China GN30-12(D) Rotary Indoor High-Voltage Disconnector Manufacturer, Factory

The GN30-12 series rotary indoor high-voltage disconnector is a new type of rotary contact-blade disconnector. Its main structure consists of two sets of insulators and contacts fixed on the upper and lower planes of a common three-phase base frame, with opening and closing achieved by rotating the contact blade. The GN30-12D variant, based on the GN30-12, adds an earthing switch to meet diverse power system needs. Compact and space-saving, it offers strong insulation performance and easy installation/adjustment. Compliant with GB1985-2004 "AC High-Voltage Disconnectors and Earthing Switches", it is suitable for indoor 12kV, 50Hz power systems to switch circuits under energized, no-load conditions, and can be used with high-voltage switchgear or independently.

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Product Description

Type & Meaning

1	Disconnector
2	Indoor type
3	Design serial number
4	Rated voltage
5	With earthing device
6	Rated current
7	Rated short-time withstand current (4s)

Normal Service Conditions

Altitude: ≤ 1000 m.
Ambient air temperature: upper limit +40℃; lower limit -10℃.
Relative humidity: daily average ≤ 95%; monthly average ≤ 90%.
Seismic intensity: ≤ Grade 8.
Locations free from severe dust, chemical corrosion, and explosive substances.
Locations free from frequent severe vibration.

Product Display

Technical Parameters

Parameters		GN30-12/400-12.5	GN30-12/630-20	GN30-12/1000-31.5	GN30-12/1250-31.5	GN30-12/2000-31.5	GN30-12/3150-31.5
		GN30-12D/400-12.5	GN30-12D/630-20	GN30-12D/1000-31.5	GN30-12D/1250-31.5	GN30-12D/2000-31.5	GN30-12D/3150-31.5
Rated Voltage (kV)		12
Maximum Voltage (kV)		11.5
Rated Current (A)		400	630	1000	1250	2000	3150
Thermal Withstand Current (kA)		12.5	20	31.5
Thermal Withstand Duration (s)		4
Rated Peak Withstand Current (kA)		31.5	50		80
Rated Insulation Level	Lightning Impulse Withstand Voltage (kV)	75
	1min Power Frequency Withstand Voltage (kV)	42

Outline and Installation Dimension

Model	L	L1	L2	A	D	n	B	C
GN30-12/630	210	680	726	820	0	2	45	550
	230	720	766	860	0	2	45
	250	760	806	900	0	2	45
GN30-12/1000, 1250	210	680	726	820	40	4	80	575
	230	720	766	860	40	4	80
	250	760	806	900	40	4	80

Model	L	L1	L2	A	D	n	B
GN30-12D/630	210	680	726	820	0	2	45
	230	720	766	860	0	2	45
	250	760	806	900	0	2	45
GN30-12D/1000, 1250	210	680	726	820	40	4	80
	230	720	766	860	40	4	80
	250	760	806	900	40	4	80

Main Structure and Working Principle

The GN30-12 series disconnector is a new rotary-type disconnector. Its main body is fixed to the upper and lower planes of the base frame via two sets of insulators, separated completely by a partition plate mounted on the base. Opening and closing operations are achieved by rotating the contact blade.

The GN30-12D variant adds an earthing switch to meet different switchgear requirements. With contacts installed on both upper and lower planes, live and non-live parts are fully isolated inside the switchgear, ensuring absolute safety for maintenance personnel.

The conductive part consists mainly of contact blades and contacts. Each blade, made of two copper plates fixed inside a rotating porcelain bushing with additional magnetic locking plates, has enhanced rigidity and excellent dynamic and thermal stability under short-circuit currents.

Ball-point contact between blades and contacts reduces assembly difficulty and ensures reliable connection. The switch can be operated with JS×GN-12 or CS6-2 operating mechanisms, or with custom-designed mechanisms.

Frequently Asked Questions

Q1: What is the primary operational mechanism of the GN30-12 series disconnector?

The GN30-12 is a rotary-type disconnector where circuit opening and closing operations are achieved through the rotation of its contact blades, operated via JS×GN-12, CS6-2, or custom-designed operating mechanisms.

Q2: What is the main difference between the GN30-12 and GN30-12D models?

The GN30-12D variant includes an integrated earthing switch device, allowing it to ground disconnected circuits and fully isolate live parts from non-live sections to ensure technician safety.

Q3: What are the standard ambient operating temperature limits?

The disconnector is designed to perform safely in ambient air temperatures ranging from an upper limit of +40℃ to a lower limit of -10℃.

Q4: How does the switch maintain thermal and dynamic stability during short circuits?

Each conductive blade consists of two copper plates fixed within a rotating porcelain bushing combined with magnetic locking plates, which significantly enhance mechanical rigidity and stability under short-circuit currents.

Q5: What are the insulation withstand voltage levels for this switchgear series?

The series features a lightning impulse withstand voltage rating of 75 kV and a 1-minute power frequency withstand voltage rating of 42 kV.