Performance Data

Performance Data

Designation Index
DE
Double Element Relay
SE
Single Element Relay
V
Unit fitted with reed switches (Vibration)
O
Switches normally open
K
Switches normally closed
AKTO
Alarm switch normally closed and Trip switch normally open
c/o
Change-over state reed switches fitted
HF
High Flow calibration units
ML
Mechanical latched element
3 DE/ HF 2
Special high calibration relay to meet the requirements of C.E.G.B. Standard 993412 TPS4/25.

Note: ‘Normally’ means with the relay full of oil under normal conditions i.e. not operating.

Operational Characteristics for PBwel Buchholz Relays

Model Designation Steady Oil Flow (mm/sec) to) Operate Trip Element Switch Oil Level (cc) to operate Alarm Element Switch @ 5° Inclination For Equipment Containing
Pipe Angle 1° not less than
Pipe Angle 9° not more than
min
max
1 SE
650
900
140
200
1 SE/VO
650
900
120
160
1 SE/VK/ML
900
1050
150
230
1 SET
450
600
n/a
1 SET/ K
1 SET/VO
1 SET/HF
650
750
n/a
n/a
1 DE
1000
1300
200
300
up to 1000 litres 1000 KVA
1 DE/ K
1 DE/ AKTO
1 DE/ VO
1 DE/ Vc/o
2 DE
1100
1400
200
300
1,001/ 10,000 litres 1,001/ 10,000 kVA
2 DE/K
2 DE/AKTO
2 DE/VO
2 DE/Vc/o
3 DE
1200
1600
200
300
10,000/ 50,000 litres 10,001 kVA/99 MVA
3 DE/K
3 DE/AKTO
3 DE/VO
3 DE/Vc/o
3 DE/HF2
1900
2500
250
350
10,000/ 50,000 litres 10,001 kVA/99 MVA
3 DE/HF2/VO

Operational Characteristics for DIN Variant Buchholz Relays

Relay Designation Steady Oil Flow (mm/sec) to Operate Trip Element Switch Oil Level (cc) to operate Alarm Element Switch @ 5° Inclination For Equipment Containing
Pipe Angle 1° not less than
Pipe Angle 9° not more than
min
max
Suitable for Equipment Containing
25 DE
1000
1300
200
300
1001/10,000 litres 1001/10,000 kVA
25 DE/VO
25 DE/Vc/o
50 DE
1100
1400
200
300
1001/10,000 litres 1001/10,000 kVA
50 DE/VO
50 DE/Ve/o
75 DE
1200
1600
200
300
10,001/50,000 Iitres 10,001 kVA / 99MVA
75 DE/VO
75 DE/Vc/o
75 DE/HF2
1900
2500
250
350
50,000 litres plus 100 MVA and above
75 DE/HF2/VO
75 DE/HF2/Vc/o

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