Insulated Metal-enclosed Combined Electrical RMU, Load break switch Unit:C,Load switch fuse combination electrical unit:F; vacuum circuit breaker Unit:V

EX-SRM-12/24/36(40.5)

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Insulated Metal-enclosed Combined Electrical RMU

PRODUCT DESCRIPTION

VAC-SRM-12/24 series of RMU is SF6 gas-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.

The Technical Specifications of this SF6 Gas Insulated RMU define its electrical and mechanical parameters for medium-voltage distribution networks. The VAC-SRM-12/24 Ring Main Unit is an SF6 gas-insulated metal common tank enclosed switchgear, consisting of load break switch units, load break switch fuse combination electrical units, vacuum circuit breaker units, and bus incoming line units. This Load Break Switch Fuse Combination Unit adopts a range of advanced technologies and materials, delivering excellent electrical and mechanical properties with minimal environmental and climate impact. The SF6 Gas Insulated RMU features a compact design, easy installation, simple operation, maintenance-free performance, and flexible combination options. The VAC-SRM-12/24 Ring Main Unit offers unit configurations including C (standard single casing load break switch unit), F (load break switch and fuse combination), V (vacuum circuit breaker unit), D (cable unit without switch), SL (bus coupler unit), M (metering unit), and PT (voltage transformer unit). This Load Break Switch Fuse Combination Unit supports double-sleeve outgoing load break switch configurations (1K2/4). Each SF6 Gas Insulated RMU provides large feeder connection capacity suitable for a variety of wiring systems, with clear and intuitive design ensuring simple and direct operation.

UNIT DEFINITION

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 SPECIFICATION

SF6 insulated ring main unit

ltem		Unit	Load break	Combination	Fuse unit
			switch unit	apparatus
Rated voltage		kV	12/24/36(40.5)	12/24/36(40.5)	12/24/36(40.5)
Rated frequency		Hz	50	50	50
Rated current		A	630	Depend on rated current of fuse	630
P.F.withstand voltage			42/65	42/65	42/65
(phase to phase,phase to earth)
Ated insulation levels	P,F.withstand voltage		48/79	48/79	48/79
	(Across open contacts)
	P.F.withstand voltage	kV	2/2	212	2/2
	(Control and auxiliary circuit)
	Lightning impulse withstand voltage		75/125	75/125	75/125
	(phase to phase,phase to earth)
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		A	63		63
Rated short circuit making current		kA	50 or63	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	630
		A	630
Rated active load breaking current		A	630
Rated Closed loop breaking current		Time
Mechanical life	Load break switch/breaker		5000	5000
	Isolating switch/earthing switch		5000	5000	5000
	Loop resistance	μΩ	≤120	1.3	≤120
Inflation pressure	Rated infation pressure(absolute pressure)		1.3		1.3
	Minimum inflation pressure	har	1.2	1.2	1.2
	(absolute pressure)
	Relative rate leakage of gas	%
			0.02	0.02	0.02
Remark;	1:Neutral point earthing system through low resistance
	II:Neutral point earthing/non-earthing system through arc suppression coil

Normal ambient conditions		Sf6 pressure	0.4bar,below 20℃

Ambient temperature		Leakage rate peryear	<0.25%/year
Maximum temperature	+50℃	Protection degree
24hours average	+35℃	SF6 gas chamber	Ip67
Minimum temperature	-40℃	Switchgear cover	Ip67
Humidity
Maximum relative
Average humidity

Load break switch Unit:C

PRODUCT OVERVIEW

The switch can be divided into single body,single body double casing outgoing line,two unit,three unit,four unit,five unit standard type,and with side inlet casing type.It adopts a structure that shares one SF6 gas box,and does not require external bus connection between each unit.Therefore,the structure is relatively simplified,easy to install,and more safe; Although the integrated structure of the air box is adopted,each unit still has independent intervals.

Six units or more are achieved by using insulated bus bars in parallel cabinets,which can be combined in front,back,or left and right directions.The cabinet type is a standard type with bus sleeves on the upper side.

STANDARD CONFIGURATION

●630A busbar

● Three position load/grounding switch

●Spring operating mechanism

●Position indication of load switch and grounding switch

●Outgoing conduit horizontally arranged at the front

● Incoming/busbar voltage indicator(single or busbar expansion type)

●Output voltage indicator

●All switch functions can be controlled by adding a padlock on the panel

● Interlocking between grounding switch and cable compartment door

●SF6 pressure gauge

●Grounding copper bar

● Explosion proof pressure relief valve

OPTIONAL CONFIGURATION

●Short circuit,ground fault indicator

●Ring current transformers and ammeters for measurement

●Ring current transformer for metering

●Switch position keylock

● Electric operating mechanism

● Reserved busbar extension

● External busbar

Load switch fuse combination electrical unit:F

PRODUCT OVERVIEW

The combined electrical unit is used for transformer protection with a capacity of 1250KVAR and below.This unit is equipped with an insulation sleeve that can be installed into a fuse.The insulation sleeve is placed inside the SF6 gas box to further improve its insulation performance.When the grounding switch is closed,the lower side of the fuse is grounded simultaneously,and the safety isolation between the upper side of the fuse and the power supply is achieved to ensure thee safety of personnel when replacing the fuse.
In order to ensure that the fuse does not cause the electrical equipment to run out of phase after one phase is blown,a trip linkage mechanism is configured in this unit.When the trip observation window displays red,it indicates that the trip device is operating or the fuse is blown and tripped.This unit can be combined with other units to achieve ring network power supply.

STANDARD CONFIGURATION

●630A busbar

●Three position load/grounding switch

●Spring operating mechanism

●Position indication of load switch and grounding switch

●Outgoing conduit horizontally arranged at the front

● Incoming/busbar voltage indicator(single or busbar expansion type)

●Output voltage indicator

●All switch functions can be controlled by adding a padlock on the panel

● Interlocking between grounding switch and cable compartment door

●SF6 pressure gauge

●Grounding copper bar

● Explosion proof pressure relief valve

OPTIONAL CONFIGURATION

●Optional configuration

●Short circuit,ground fault indicator

●Ring current transformers and ammeters for measurement

●Ring current transformer for metering

●Switch position keylock

● Electric operating mechanism

● Reserved busbar extension

● External busbar

Vacuum circuit breaker Unit:V

PRODUCT OVERVIEW

Using spring type vacuum circuit breaker.The mechanical life can reach 5000 times;(The protection action is fast,and the opening time is not more than 30ms),making it easy to achieve differential coordination.
Using a three-position load isolation switch instead of a regular isolation switch can break the normal load current in special circumstances,improving product reliability.
The vacuum circuit breaker and load switch are sealed together in an SF6 gas box made of 3mm thick stainless steel plate, achieving full insulation,sealing,and maintenance free throughout the entire system.

STANDARD CONFIGURATION

●630A busbar

●630A circuit breaker module ISM

●Controller CM (DC24V operating power supply)