STB-L Series: Wall Bushing with CT

RHM is proposing a combined wall bushing and current transformer option for specific applications.  Very compact, it uses a toroidal type current transformer mounted around the bushing.

Performance

• Rated voltage: 40.5 - 252kV
• Rated transformation ratio: 100~2500/5A or 100~2500/1A
• Rated frequency: 50Hz-60Hz
• Rated output: 20-40VA
• Metering accuracy class: 0.2S, 0.2, 0.5S and 0.5 class
  Accuracy limit factor 5,10, 15, 20, 30, 40
• Protection accuracy class: 5P, 10P
• Secondary windings: 1-6

Operational Conditions

1. Environmental temparature: -50C / +45C
2. Altitude: <1000m above sea level (when higher than 1000m, specific design available. Please contact us)
3. Creepage distances: in the range 25 to 31 mm/kV

Typical dimensions – please contact us for custom designs:

Model and Specification	Highest Voltage for Equipment (kV)	Rated Current (A)			Dimensions		(mm)					Creepage Distance (mm)
			L	L1	L2	L3	L4	a1	a2	b1	b2
STB - L - 40.5 / 630	40.5	630	1640	350	450	350	1045	40	80	300	360	1015
STB - L - 40.5 / 2000	40.5	2000~2500	1740	350	450	350	1095	60	120	300	360	1015
STB - L - 72.5 / 630	72.5	630	2770	630	1000	630	1550	40	80	350	400	1925
STB - L - 72.5 /1600	72.5	1600	2820	630	1000	960	1575	50	100	350	400	1925
STB - L - 126 / 630	126	630	3470	960	1100	960	1850	40	80	350	400	3200
STB - L - 126 / 2000~2500	126	2000	3620	960	1100	960	1930	60	120	350	400	3200

 

More Information

To view our technical papers, click here.