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BCU & BA

Bushing Accessories

Miscellaneous accessories are available for the ICMseries instruments such as bushing adapters and bushing coupling units for transformer testing and monitoring.

BCU2

Bushing Coupling Units

Miscellaneous accessories are available for the ICMseries instruments such as bushing adapters and bushing coupling units for transformer testing and monitoring.

Bushing Accessories

Bushing Coupling Units

The bushing coupling units are for permanent installation on power transformers. Together with a matching bushing adapter they serve to make different signals available for measurement and monitoring. The bandwidth of the partial discharge signals extends to 20 MHz. The voltage signal of the built-in capacitive divider serves to synchronize the partial discharge acquisition and to measure the voltage. However, the excellent bandwidth of the voltage signal allows also transfer impedance measurements and tan delta (power factor) measurements.

The bushing coupling unit comes in a IP65 protected enclosure with a PTFE insulated input cable. Thus, it is suitable for indoor and outdoor use. The voltage range and bushing capacitances (C1 and C2) have to be specified on order.

Bushing Adapters

Due to the many different versions of transformer bushings and, hence, bushing test tabs, individual adaptation and flexible installation of bushing accessories are required for testing. Power Diagnostix offers various bushing adapters fitting to many different models of bushing test tabs.

Type Thread Size Connection Size E. g. suitable for
BA2 inside G¾" female 4 mm Micafil standard, RTKF, RTKG
BA3 outside M45x2 female 8 mm ABB, GOB 1050-750-110-0.6-B
BA4
adapter
flange
inside
--
M76x1.5
male 8 mm Nanjing Electric, BRLW-500/1250-3
BA5 inside M24 male 4 mm HSP, ESKTFK 1050/245-A, OTFS 550/123-0
BA6 outside M38x1.5 male 4 mm Micafil, WTF 420/1800 (1978)
BA7C outside 2 ¼" - 12UNF female 8 mm Pcore, POC, CSA standard, Trench, (C)OTA
BA7D outside 2 ¼" - 12UNF female 3.5 mm Trench, OTA 363/1250/1300
BA8 inside 5/8" - 11UNC -- 3 mm ABB, GOB 650/1250/L
BA9 outside M30x1.5 female 4 mm HSP, SETFt 1550/420-1800, SETFt 600/123-2000
BA9B inside M30x1.5 female 8 mm Alstom Grid, P.F. tap
BA10 outside M16x1.5 female 4 mm Trench, COT 550/325/650-2500,
COT(C) 125-X...1800-X
BA10B outside M16x1.5 female 4 mm Trench, COT 550/325/650-2500,
COT(C) 125-X... 1800-X (≥ 123 kV)
BA11 flange -- female 8 mm ABB, GOA 650/1050,
ASEA, GOA 1550 400 KV
BA12 outside M30x2 female 6 mm NGK, R-D5350D-KEW
BA14 outside 1 1/16" - 12UN female 8 mm Transelectrix
BA15 outside M30x2 female 9 mm NGK, R-C6200V-LN
BA16 outside M30x2 female 4 mm ABB, GOB 1050
BA17 outside M30x2 female 4 mm ABB, GOB 1050-750-1100-0.6-B,
GSA 123-0A/1600/0.5,
GSA 52-0A/2000/0.5
BA18 flange -- female 8 mm Mosizolyator, GMTA-90-110/2000
BA19 flange -- female 8 mm Mosizolyator, GMTA-45-330/2500
BA21 outside M24x1.5 female 4 mm HSP, SETFt 03d, SETFt 1425-420-1600,
SETFt 750-170-4000
BA21B outside M24x1.5 female 4 mm HSP, OTF (420-800 kv)
BA23 internal M36x3 female 5 mm BHEL, Tap Inv. no. BCE-4-1232
BA25 outside 1¼'' - 12UNF spring Ø 5 mm PCORE, B-81515-57-70
BA26 outside 1 1/8" - 12UNF female ¼'' Electro Composites, 350-006-T-730-00

 

Other adapter models are available on request and will be custom made. For this, Power Diagnostix needs the dimensions of the bushing's test tap (at least a, b, e, and g) as shown with the images below.