Rhb-Outdoor Sf6 Gas Circuit Breaker (66kV/132kV)

• Breaking Capacity: High Voltage Circuit Breakers
• Operation: Electric Type
• Speed: Normal Type Circuit Breaker
• Arc-extinguishing Medium: SF6
• Installation: Fixed/Drawable
• Structure: Conventional Circuit Breaker
• Model NO.: RHB
• Poles Number: 3
• Type: Circuit Breaker
• Function: Overcurrent Protection, Circuit-Breaker Failure P
• Certification: ISO9001-2000, CE
• Transport Package: Wooden
• Specification: IEC, ANS
• Trademark: Rockwill
• Origin: China
• HS Code: 85352100
• Production Capacity: 5000 PCS/Year

Product Description

Summary
 

ROCKWILL® Electric strives to bring our customers the latest technology and competitive pricing and best service for distribution automatic.
RHB medium voltage circuit-breakers for outdoor installation use sulphur hexafluoride gas (SF6) to extinguish the electric arc and as the insulating medium.
Breaking in SF6 gas takes place without current chopping or generation of overvoltages.
These characteristics guarantee a long electrical life for the circuit-breaker and limited dynamic, di-electric and thermal stresses on the installation.
The GSH type of stored energy and free release mechanical operating mechanism allows opening and closing operations through local and remote control.
The operating mechanism, the activating kinematics of the moving contacts and the anti-condensation heater are located inside a tight metal enclosure which also acts as the support for the poles.
The above-mentioned structure is supported by a frame made of telescopic metal sections which allow the height of the circuit-breaker terminal to be adapted from 2800 mm to 3700 mm.
The metal enclosure has IP 54(*) degree of protection and is fitted with a tight door with an inspection window. The circuit-breaker is compact and ensures a high level of sturdiness and excellent mechanical reliability.
The enclosure is made out of a steel plate with adequate surface protection by a special metalising and painting process. The support structures are hot dip galvanised.
 

Breaking technique

The breaking principle of RHB circuit-breakers is based on compression and self-blast technique to obtain top performances at all breaking current values, with minimum arc times, gradual arc extinction without chopping, and no restriking or switchingovervoltages.
This breaking technique - already widely appreciated and used in high voltage circuit-breakers, has been introduced into medium voltage with the HM4 series circuit-breakers for indoor installation.
 

Main contact separation

No electric arc is struck because the current flows through the arcing contacts. During its run downwards, the moving apparatus compresses the gas in the lower chamber. The compressed gas flows from the lower to the upper chamber, thereby taking both the chambers to the same pressure.

Arcing contact separation

The current flows due to the electric arc which has struck between the arcing contacts. The gas cannot escape through the nozzle because the hole is still closed by the fixed arcing contact and cannot even escape through the inside of the arcing contact, because of the clogging effect of the electric arc.

Standards and service

The RHB circuit-breakers comply with the IEC 62271- 100 standard as well as of other major industrialised countries. They have undergone the tests indicated ensure service safety and reliability of the apparatus in all installations.
The mechanical and electrical locking devices have been provided to prevent incorrect operations and to carry out inspection of the installations while guaranteeing maximum operator safety.
  

Main technical data
 

Circuit-breaker on column		RHB-12/24		RHB-36		RHB-40
Standards	IEC 62271-100	•		•		•
Rated voltage	Ur [kV]	12/24		36		40.5
Rated insulation voltage	Us [kV]	12/24		36		40.5
Withstand voltage at 50 Hz	Ud (1 min) [kV]	70 (dry) / 60 (wet)		95 (dry) / 80 (wet)		95 (dry) / 80 (wet)
Impulse withstand voltage	Up [kV]	125/150		200		200
Rated frequency	fr [Hz]	50-60		50-60		50-60
Rated normal current (400C)	lr [A]	1250	2500	1250	2500	1250	2500
Rated breaking capacity	Isc [kA]	25	25	25	25	25	25
		31.5	31.5	31.5	31.5	31.5	31.5
Rated short-time	Ik [kA]	25	25	25	25	25	25
withstand current (3 s)		31.5	31.5	31.5	31.5	31.5	31.5
Making capacity	Ip [kA]	63	63	63	63	63	63
		80	80	80	80	80	80
Operation sequence	[O-0, 3s-CO-15s-CO]	•		•		•
Opening time	[ms]	45+10		45+10		45+10
Arcing time	[ms]	10-15		10-15		10-15
Total breaking time	[ms]	55-60		55-60		55-60
Closing time	[ms]	75+10		75+10		75+10
Overall dimensions	on frame	3090 - 3840		3090 - 3840		3090 - 3840
	H [mm]
	L [mm]	900		900		900
	P [mm]	686		686		686
Weight	[Kg]	900		900		900
SF6 gas absolute pressure	Rated service value [kPa]	380		380		550
Operating temperature (1)	[0C]	-25...+40		-25...+40		-25...+40
Tropicalisation	IEC: 60068-2-30, 721-2-1	•		•		•
Electromagnetic compatibility	IEC: 60694, 61000-6-2, 61000-6-4	•		•		•
Solar radiation	[W/m2]	1000		1000		1000
Presence of pollution	IEC 815 - table 1	Level III		Level III		Level III
Creepage distance	[cm/kV]	2.5		2.5		2.75
Ice coating	[mm]	10		10		10
Wind speed	[m/s]	34		34		34
Earthquake resistance	[g]	0.3		0.3		0.3
Static force on the terminals	Longitudinal [N]	750		750		750
	Transversal [N]	500		500		500
	Vertical [N]	750		750		750
(1) For lower operating temperatures, please consult us.