12/24kV Solid Insulated Metal-enclosed ring main unit

Product Detail

Description

CKSS-12/24 series of ring main unit is insulated metal common tank enclosed switchgear, consisting of load break switch unit, load break switch fuse combination electrical unit, vacuum circuit breaker unit, and the incoming line unit of bus. It adopts a range of advanced technologies and materials, with excellent electrical and mechanical properties, less affected by environment and climate, in small size, easy to install, easy to operate, with no need of maintenance, and can be flexibly combined. Its clear and intuitive design ensures simple and direct operation, the feeder's connection capacity is large, suitable for a variety of wiring systems.

Feature

Excellent solid insulation performance: Adopts advanced solid insulating materials such as epoxy resin to fully encapsulate internal high-voltage live components, featuring high insulation strength that can effectively withstand electrical stress at 12kV or 24kV voltage levels. Unlike traditional insulation methods, it is not affected by environmental factors such as humidity, dust, and pollution, greatly reducing the risk of flashover and breakdown, and ensuring long-term stable operation of the equipment in complex environments.
Compact and space-efficient design: The metal-enclosed structure is extremely compact with a small footprint, suitable for installation in space-constrained locations such as urban distribution stations, commercial building switchrooms, and industrial park substations. By optimizing the internal layout, various functional modules are closely integrated, reducing installation space requirements while facilitating transportation and on-site installation and commissioning, thus improving the utilization efficiency of the site space.
Multiple safety protection mechanisms: The cabinet body adopts a fully enclosed metal shell, which can effectively shield the internal high-voltage electric field and prevent accidental electric shock to personnel. It is equipped with complete internal mechanical and electrical interlocking devices to strictly prevent dangerous situations such as incorrect switching operations, on-load switching, and entry into live compartments. Some products are also equipped with live display devices to intuitively show the live status of the equipment in real-time, further ensuring the safety of operators and equipment.
Low maintenance and long service life: The solid insulating materials have strong stability, and internal components are sealed in the metal shell, effectively isolating external erosion, reducing component aging and failures caused by environmental factors, and achieving long-term maintenance-free operation. Under normal circumstances, the service life of the equipment can reach 20 years or more, reducing the life-cycle maintenance costs and equipment replacement frequency, and providing users with reliable long-term investment returns.
Flexible power distribution adaptability: Supports multiple wiring methods such as ring network power supply and radial power supply, and can be easily connected with 12kV or 24kV transformers, cables, and other power equipment, flexibly adapting to different medium-voltage distribution network topologies. It can easily meet the needs of various power distribution scenarios, whether for urban power grid upgrading projects or complex power supply requirements in industrial plants.
Outstanding environmental performance: Different from SF6 gas-insulated ring main units, this equipment does not use SF6 gas, avoiding potential environmental hazards caused by SF6 gas leakage, and conforming to the current concept of green environmental protection. It is especially suitable for the construction of power distribution facilities in areas with strict environmental requirements, such as ecological protection zones and urban core areas.

Unit code	Meaning
C	Standard single casing load break switch unit
F	Load break switch and fuse combination
V	Apparatus unit
D	Cable unit(without switch)
+	Side casing of busbar
-	Top casing of busbar
SL	Bus couple unit
M	Metering unit
PT	PT unit
1K2(4)	Double-sleeve outgoing load break switch unit

Technical Sheet

ltem		Unit	Load break switch unit	Combination apparatus	Fuse unit
Rated voltage		kV	12/24	12/24	12/24
Rated frequency		Hz	50	50	50
Rated current		A	630	Depend on rated current of fuse	630
P.F.withstand voltage (phase to phase.phase to earth)		kV	42/65	42/65	42/65
Ated insulation levels	P.F.withstand voltage(Across open contacts)		48/79	48/79	48/79
	P.F.withstand voltage (Control and auxiliary circuit)		2/2	2/2	2/2
	Lightning impulse withstand voltage (phase to phase, phase to earth)		75/125	75/125	75/125
	Across open contacts		85/145	85/145	85/145
Ogauge pressure test		—	Pass	Pass	Pass
Rated short time withstand current		kA	20/4s/20/3s	—	20/4s/20/4s
Rated peak withstand current		kA	63	——	63
Rated short circuit making current		kA	50 or 63	Subject to high-voltage fuse	50
Rated short circuit breaking current		kA	—	Subject to high-voltage fuse	20/20
Rated transform current		A	—	1750/1400	—
Rated active load breaking current		A	630	—	—
Rated Closed loop breaking current		A	630	—	630
Mechanical life	Load break switch/breaker	Time	5000	5000	10000
Mechanical life	Isolating switch/earthing switch	Time	5000	5000	5000
Loop resistance		μΩ	≤120	—	≤120
Inflation pressure	Rated inflation pressure(absolute pressure)	bar	1.3	1.3	1.3
Inflation pressure	Minimum inflation pressure(absolute pressure)	bar	1.2	1.2	1.2
Relative rate leakage of gas		%	≤0.02	≤0.02	≤0.02

Remark: l :Neutral point earthing system through low resistance

Brand	ROCKWILL
Model NO.	12/24kV Solid Insulated Metal-enclosed ring main unit
Rated voltage	12kV
Rated frequency	50/60Hz
Series	CKSS