Buchholz Relay
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Transcript of Buchholz Relay
BUCHHOLZ RELAYSTR | FI | ES | MA | GM | MK | TN | EG | AZ | IQ |SY | SA | AE | YE | MZ
BUCHHOLZ RELAYSOrderin System
1
Purchase orders should be given in accordancewith the following chart.
COLOR DESCRIPTION
RAL 1016
RAL 7001
RAL 7012
RAL 7016
01
02
03
04
RAL 7022
RAL 7032
RAL 7033
RAL 7035
05
06
07
08
RAL 7037
RAL 7038
RAL 9002
09
10
11
Example:AMBR25-F50: 751. 1. 1. 2. 01- (01) BUCHHOLZ RELAY FOR CONTACT CONNECTION DETAILS 9 or 10 See page
TYPE
ABR25-V50 (DG-25)
ABR25-F50 (DR-25)
ABR50-F100 (DR-50)
ABR80-F100 (DR-80)
741
751
761
771
UPPER CONTACT SYSTEM
Standart Reed Switch Normally Open (R-NO)
Standart Reed Switch Normally Closed (R-NC)
Changeover Reed Switch (W)
Without Contact (0)
1
2
3
0
LOWER CONTACT SYSTEM
Standart Reed Switch Normally Open (R-NO)
Standart Reed Switch Normally Closed (R-NC)
Changeover Reed Switch (W)
1
2
3
OIL FLOW SPEED SETTING
1,00 m/s
1,50 m/s
2
3
2 Normally Open Contact 03
2
BUCHHOLZ RELAYSAN-50216-2
MATERIALBuchholz Relay casing, cover, terminal box cover, glass frame coverare produced from aluminum material and coated with electrostaticpowder paint. The glasses on the relay are produced from temperedglass to make them stronger against breakage. Markings andgraduations on the glass are written with special firing technique.
MOUNTING THE BUCHHOLZ RELAY TO THE TRANSFORMERBuchholz Relay is intended to work in a horizontal positions. it isconnected with a 5° positive angle to the horizontal axis with thearrow mark on the relay pointing to the oil conservator.Buchholz Relays are manufactured to allow both thread and flangeconnections. Thread connections types for flange connections are also shownin (Table 1).
WORKING PRESSUREBuchholz Relay is tested for an inner pressure of 50 kPA. In additionto that, it is tested with an extreme pressure of 250 kPA for 2 minutes.
MAGNETIC FIELD RESISTANCEBuchholz Relays operate perfectly up to 25m T magnetic fieldsAdditionally, they are resistant to any d.c. field value at any dşrectionand polarization.
WORKING CURRENTSThe working current is 2A. r.m.s and 30ms, The short circuit currentis 10A. r.m.s.
TERMINAL BOXIn the terminal box, there is 1 earthing terminal and depending on thenumber of contacts there are 4 to 10 electric terminals.These electric terminals allow connection of cables with 1,5 and 4mm 2cross sections. PG16 or M20X1,5 cable gland can be used for cableentry. Connection diagram of the electric terminals is shown on theelectric terminal cover.
OIL TUBE CONNECTION
INNER DIAMETER mm
25
STEADY OILFLOW FOR THE
RELAY TO WORK m/s
1
TOLERANCE
±15
50
80
1
1-1,5
±15
±15
VOLTAGE
48V-127V d.c
CURRENT
2A
SEPARATION CAPACITY
L/R <40ms
2A Cos c >0.5
250W
400VA
SEPARATION AND CLOSING CAPACITY
Table1 - STEADY OIL FLOW FOR THE RELAY TO WORK m/s
230V a.c
INTENDED USE OF BUCHHOLZ RELAYOn power and distribution transformers with oil conversator,protection relays manıfactured by Buchholz principle are mountedbetween transformer tank and oil conservator and protects thetransformer against the following conditions:1-Against gas accumulations in the transformer,2-Against potential oil leakages in the transformer,3-Against oil surge which can occur during overheatingsituations caused by failures in transformers.
1-AGAINST GAS ACCUMULATIONS IN THE TRANSFORMERTwo float systems exist in the Buchholz Relay. These two floatsystems activate dry type Reed switches connected to them. Thefloat system which is at the Buchholz Relay’s upper sideactivates the alarm reed switch. In case between 100 cm3 and300 cm3 or 400 cm3 amounts accumulate in the Buchholz Relay,or in case of an oil leakage with these amounts, the alarm switch isactivated and sends a signal. As this alarm reed switch can be usedas one normal open or two normal open, one switch can be usedas changeover as well.
3-OIL SURGE WHICH CAN OCCUR DURINGOVERHEATING SITUATIONS CAUSEDBY TRANSFORMER FAILURESIn case of overhating situations caused by transformer failures,if the oil flow rate (table-1) in the Buchholz Relay exceeds thespecified values, the lower float system described in item two isactivated and sends a signal. This signal (trip) is also used to deactivate the transformer.
2-AGAINST POTENTIAL OIL LEAKAGESIN THE TRANSFORMERAs mentioned in item 1, when oil leakages that occur in thetransformer are more than 100 cm3, 300 cm3 and 400 cm3 thecontact system connected to upper float activates, the reed switchconnected to the second float system in the Buchholz Relayactivates and sends a signal. This signal means that the oil leakage in the transformer reached to critical level and there isnot enounh oil in the oil conservator to protect the transformer.Therefore this contact is called the “trip contact”.This is the contact used to deactivate the transformer.Thiscontact working in connection to the lower float can be used asone or two or can be preferred as changeover reed switch as well.
SAMPLE TAPThere is the sample tap over the Buchholz Relay. This tap allowstaking oil from within the transformer and degassing the gassesaccumulated in the relay as well. The tap is manufactured withglob valve principle in order to prevent gas leakage.
CONTROL-TEST BUTTONUsed to test if the contacts are working properly by moving theupper and lower floats in the Buchholz Relay up and down.Additionally, when the lower float is activated because of the oilflow rate, the signal doesn’t disappear from the system unless thesystem is reset by the test button.The systems are reset and the signal disappears when the test button is pressed.
3
Figure B: casing with thread connectionFigure A: casing with flange connection
Thread (B) and flange (A) connection types.
Inspection sight glass cover.
Strong and speciallygradualed inspection glass.
Terminal box
Sample tap
Control-test button
Product label area
Earthing screw
Electric terminal
Electric terminal connection scheme
Terminal box cover
Cable coupling(PG16 or M20x1,5)
Blind plug
BUCHHOLZ RELAYSAN 50216-2
Connection Hanger
Lower Float
Upper FloatUpper Reed Switch
Lower Reed Switch
Control-Test Button
Flow Speed Control Element
4
BUCHHOLZ RELAYSAN 50216-2
2812
5
18
185
6788
65
223
G1½
A
91 178.5
351
166
R92Ø25
Type NoDIN CODE
Type NoDIN CODE
ConnectionNom.Pipesize
(mm.) D1Weight(kg.)
TransformerPowerClass
741ABR25-V50
(DG-25)(AN50216-2)
ScrewedG 1½A
25 3,9 �5000 KVA
5
BUCHHOLZ RELAYSAN 50216-2
Type NoDIN CODE
Type NoDIN CODE
ConnectionNom.Pipesize
(mm.) D1Weight(kg.)
TransformerPowerClass
751ABR25-F50
(DR-25)(AN50216-2)
FLANGED 25 4,7 �5000 KVA
Ø11
5
Ø68
200
178.5
R92Ø85
Ø25
Ø14
166
351
16
88 223
67
91
65
2812
5
6
BUCHHOLZ RELAYSAN 50216-2
Type NoDIN CODE
Type NoDIN CODE
ConnectionNom.Pipesize
(mm.) D1Weight(kg.)
TransformerPowerClass
761ABR50-F100
(DR-50)(AN50216-2)
FLANGED 50 5,8 �10000 KVA
195
Ø10
2
Ø16
5
Ø18
351
90°
166
75.
5
R92Ø50
Ø125
68
18
28
178.5
112.
5
91
226
82.5
�5000 KVA
7
BUCHHOLZ RELAYSAN 50216-2
Type NoDIN CODE
Type NoDIN CODE
ConnectionNom.Pipesize
(mm.) D1Weight(kg.)
TransformerPowerClass
771ABR80-F100
(DR-80)(DIN 42566)
FLANGED 80 6,5 �10000 KVA
195
Ø13
8
Ø20
0
Ø18
351
Ø80
166
R92
Ø160
178.5
60.5
65
18
2897
.5
229
100
M16
8
BUCHHOLZ RELAYSAN 50216-2
Lower
Yellow11 12
Lower
Yellow14 11 12
Lower
Yellow11 12
Upper
Red21 22
Lower
Yellow14 11 12
Upper
Red24 21 22
Lower
Yellow11 12
Lower
Blue31 32
Upper
Red21 22
Upper
Green41 42
Lower
Yellow11 12
Lower
Blue31 32
Upper
Red24 21 22
Upper
Green34 31 32
(Lover float)(Single Contact)
1 Normally Open Contact
01(Lover float)
(Single Contact)1 Changeover Contact
(2 Normally Open Contact)1 Normally Open Contact Lower1 Normally Open Contact Upper
(2 Changeover Open Contact)1 Changeover Open Contact Lower1 Changeover Open Contact Upper
(4 Normally Open Contact)2 Normally Open Contact Lower2 Normally Open Contact Upper
(4 Changeover Open Contact)2 Normally Open Contact Lower
2 Changeover Open Contact Upper
NORMALLY OPEN CONTACT
02 03 04
05 06
9
BUCHHOLZ RELAYSAN 50216-2
NORMALLY CLOSED CONTACT
07
Lower
Yellow11 12
(Lover float)(Single Contact)
1 Normally Closed Contact
(2 Normally Closed Contact)1 Normally Closed Contact Lower1 Normally Closed Contact Upper
Lower
Yellow11 12
Upper
Red21 22
08
(4 Normally Closed Contact)2 Normally Closed Contact Lower2 Normally Closed Contact Upper
Lower
Yellow11 12
Lower
Blue31 32
Upper
Red21 22
Upper
Green41 42
09
Upper
Red24 21 22 34
Lower
Yellow11 12
Lower
Blue31 32
Upper
Green31 32
(4 Contact)2 Normally Closed Contact Lower
2 Changeover Closed Contact Upper
10
10
BUCHHOLZ RELAYSAN 50216-2
Buchholz Relay Sectional Views
Sample Tap
Control-Test Button
Oil Speed Control Element
Float Seating
Control - Test Button
Contact Locking Magnet
11
BUCHHOLZ RELAYSAN 50216-2
DATAPARAMETER NOTES
AC 230VDC 230V
Nominal voltage 12 V to 250 V12 V to 250 V
Nominal current
AC 1000 VContact voltage capacity -
AC 2000 VInsulation voltage capacity Contact against casing
AC 230VDC 230V
12 V to 250 V12 V to 250 V
TECHNICAL DATA
Temperature range:
(-40°C to +55°C)-(40°F to +131°F)-ambient temperature Climate acc. to DIN EN 60068-2-78:2002-09
-working range:
(-40°C to +155°C)-(-40°F to +239°F)(*temperature of the insulation fluid) Others on request
<1100 mm²/s(*viscosity of the insulation fluid)
class 4M6Shock resistance
2g(peak value) frequency range 2Hz to 200 Hz-Earthquake / Vibration -
25g/shocl duration 11 ms-Impact -
0.25 MPaResistance to pressure -
<2.5 kPaResistance to vacuum -
25mTInsensitivity to magnetic fields -
-Flow of insulation fluid
1.00 m/s+15%nominal diamenter (DN) 25 mm -
1.00 m/s+15%nominal diamenter (DN) 50 mm -
1.00 m/s+15% or 1.50 m/s+15% or 2.00 m/s+15%nominal diamenter (DN) 80 mm -
M20x1.5Cable gland Others on request
1° accending towards expansion vesselNominal installation position 0° to 5°
IP54Degree of protection Others on request
Switching system:
1-Number or switching contacts per switching system More on request
magnet contact tube-Switching contact -
hold by magnets-Flow speed control element -
<0.1s-Response time of speed control element -
Response of switching system in case of:
200 cm³ to 300 cm³-Gas accumulation -