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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 Ø E. g. suitable for
BA2 inside G¾" female 4 mm Micafil: RTKF, RTKG, RTKK, RTF, RTFX 21, RTFX 36
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 series 2, CSA standard;
ABB: GOE, GSB (245–550 kV)
BA7D outside 2 ¼" - 12UNF female 3.5 mm Trench: OTA 363/1250/1300,
OTA (72.5–1200 kV),
COTA 1675-H016-23-AG3-01
BA8 inside 5/8" - 11UNC -- 3 mm ABB: GOB 650/1250/L
BA9 outside M30x1.5 female 4 mm HSP: SETFt 600/123-2000, SETFt 1550/420-1800,
SETFt 1550/420-2200
BA9B inside M30x1.5 female 8 mm Alstom Grid: P.F. tap
BA10 outside M16x1.5 female 4 mm Trench: COT 125-X...1800-X (≥ 123 kV)
BA10B outside M16x1.5 female 4 mm Trench: COT(C) 125-X... 1800-X (< 123 kV)
BA10C outside M16x1.5 female 4 mm Trench: COT 750-800
BA11 flange -- female 8 mm ABB: GOA 650, GOA 1050,
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
BA17 outside M30x2 female 4 mm ABB: GOB 250 ... 750/1250,
GOB 1050-750-1100-0.6-B,
GSA-OA 52/2000, GSA-OA 73/2000,
GSA-OA 123-1600, GSA 145/1600, GSA-OA 170/1600
BA18 flange -- female 8 mm Mozisolyator: GMTA-90-110/2000
BA19 flange -- female 8 mm Mozisolyator: GMTA-45-330/2500
BA21 outside M24x1.5 female 4 mm HSP: SETFt 750-170-4000, SESTFt 1050-245-B E6 B, SETFt 1200/245-1250, SETFt 1200/245-3000, SETFt 1425-420-1600, EKTG (72.5-800 kV)
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 5 mm PCORE: B-81515-57-70
BA26 outside 1 1/8" - 12UNF female ¼'' Electro Composites: 350-006-T-730-00
BA27 outside 1 1/8" - 12UNF female 8 mm Passoni Villa: PNO, POBO, PAO (<110 kV)

 

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.