Manuale Flow Relay

I

INSTRUCTION MANUAL

Electronic Buchholz Relay eBR

5COR472400 eBR REV01

0

CONTENT:

1 SAFETY 1.1 Safety instructions 1 1.2 Specified applications 1 1.3 Safety notes on the equipment operation 1

2 ELECTRONIC BUCHHOLZ RELAY TYPE eBR 2.1 Drawing 2 2.1.1 eBR 80 2

2.2 Operating principle 3 2.2.1 Adding features 3 2.2.2 Construction 3

2.3 Technical features 4

2.4 Test 5

3 INSTALLATION 6

4 ELECTRICAL CONNECTION 7

5 FUNCTIONAL TEST 9

5.1 Mechanical testing by test keys 9

5.1.1 Volume alarm verification 9 5.1.2 Trip verification 9 5.2 Pneumatic testing by pneumatic valve 10

6 WHAT TO DO IN THE CASE OF GAS ACCUMULATION 10

7 OPERATION AND MAINTENANCE 11 7.1 Operation 11 7.2 Maintenance 11 7.3 Movement, transport and storage 11

A APPENDIX A MODBUS (RTU) REGISTERS

A.1 Addressing 12 A.2 Registers Tables 13 A.2.1 Main registers Table 13 A.2.2 Memory registers 13 A.3 Register Description 14 A.3.1 Main registers Descriptions 14

B APPENDIX B PETCOCK

B.1 Connection 15

B.2 Contact Technical Data 15 C APPENDIX C GAS SAMPLING DEVICE C.1 Drawing 16 C.2 Construction 16 D APPENDIX D Order sheet 17

E APPENDIX E Figure and reference numbers key 18

1

1. SAFETY 1.1 Safety instructions

Make sure that any personnel installing and operating the electronic Buchholz relay:

x Are technically qualified and competent x Fully comply with these assembling instructions

Improper operations or misuse could cause danger to:

x Life and limb x To the equipment and other assets of the operator x To the proper function of the equipment

Safety instructions in this manual are shown in three different forms to emphasize important information. 1.2 Specified applications The Buchholz Relay is used to protect the transformer when a malfunction occurs (high eddy current, local overheating or partial discharges) inside the main tank It is important to observe the limit values indicated on the nameplate and in the operating instruction before commissioning the device. 1.3 Safety notes on the equipment operation Electrical installation is subject to the relevant national safety rules. It is mandatory to connect the grounding cable.

WARNING

This information indicates particular danger to life and health. Disregarding such a warning can lead to serious or fatal injury.

CAUTION

This information indicates particular danger to equipment and/or other property of the user. Serious or fatal injury cannot be excluded.

NOTE

This note gives important and specific information concerning the equipment.

CAUTION

Installation, electrical connection and fitting the device may only be performed by qualified personnel and only in accordance with this instruction manual. It is the responsibility of the user to ensure that the device is used for specified application only. For safety reasons, please avoid any unauthorized and improper usage.

WARNING

All relevant fire protection regulations must be strictly followed.

2

2. ELECTRONIC BUCHHOLZ RELAY TYPE eBR 2.1 Drawing 2.1.1 eBR 80 General dimensions for the electronic Buchholz Relay type eBR80

Fig. A

1

2

Fig. B

3

4

6 7 5

8

Fig. C

9

10 10

3

2.2 General information and operating principle The generation of gas in an oil filled transformer is a clear indication of a problem. The gas may be a result of the following: x Decomposition/degradation either of solid or liquid insulation inside the transformer due to overheating, or arcing. x From external environment through bad pipeline sealing x From the oil itself due to unsatisfactory de-gassing operations prior filling transformer main tank Fast and sudden oil movement in the pipeline towards the oil conservator is caused by an internal arc, short circuit, or hot spot which must be correctly addressed. Oil leaks from the transformer are environmentally unacceptable and a fire hazard will lead to transformer failure. The Buchholz relay is located in the pipework between the transformer and its conservator and it is filled with oil during normal transformer operation. When gas is generated in the transformer it rises towards the conservator and collects in the upper chamber of the relay. The oil level drops and the top float triggers alarm switch (oil level between 200 to 300 ml). Gas shall not freely pass from the relay body and escape into the pipework before the alarm contact has operated. The trip contact shall operate at a steady oil flow. This operation shall not be adversely affected when the alarm contact has already closed and gas is escaping freely. In the event of an oil leak the Buchholz relay will only operate after the conservator has exhausted all of its oil. 2.2.1 Adding features COMEM's proven expertise led to develop a new eBR Electronic Buchholz Relay that noticeably improves the performances, reliability and safety of your transformer thanks to advanced monitoring features. The reed based standard electro-mechanical features, an electronic transducer and a dedicated PCB allow you to constantly monitor the gas accumulation in the Buchholz relay by 4-20mA analog output or MODBUS RTU protocol. The double flow vanes ensure the detection of two thresholds of oil flow speed. In particular, an alarm and a trip signal are independently generated at two different values of oil flow (e.g. alarm at 1.5m/s and trip at 3m/s). A based on the use of dedicated reed contacts for the detection of the oil flow thresholds provides the possibility to immediately and remotely identify the trip causes (oil flow or oil leakage/gas accumulation) by means of 4-20mA analog output or MODBUS RTU protocol. As option there is the possibility to remotely control an electrical contact on the PCB in such a way to command the opening of valve for the gas discharge. 2.2.2 Construction eBR Electronic Buchholz Relay is built on a robust foundation which consists of a die casting aluminum main body with two tempered glass inspection windows (1/A) with graduated scale markings (cubic centimeters) that indicates the oil volume passing through the relay. The oil drain plug is located at the bottom of the main body (2/A). The top cover holds the frame which contains the moving parts of the eBR: two floats (3/B) and their associated switch reeds and magnets, two calibrated flow valves (4/B). Also: A gas discharge valve with G1/8 in male thread with protective cap (5/C) A valve for pneumatically testing the alarm and insulation circuits, with protective cap (6/C) A push rod for volume alarm mechanical verification of the reed switch with protective cap (7/C) A push rod for trip mechanical verification of the reed switch with protective cap (8/C) A terminal box (9/A)

4

2.3 Technical features

Material All the external parts are resistant to transformer oils, salt fog and UV rays.

Color White RAL 9002(1)

Ambient temperature -40C +80C

Degree of protection IP65 according to EN60529

Oil temperature -40C115C

Weight 6,5 Kg

Ventilation valve 1, to prevent the formation of condensation

Cable gland n2 x M25x1.5

Terminal box Screw terminal 2.5mm2

Wires Max 2.5mm2 advised 4x1mm2 o 6x1mm2 shielded twisted pair cable for analog/digital

output Oil flow speed (m/s) Alarm Trip

- 1.0

1.0 1.5

1.0/1.5 2.0

1.0/1.5/2.0 2.5

1.0/1.5/2.0/2.5 3.0

Electronic board features

Power supply (terminals 1-2) 24 Vdc 10% polarized

Power consumption 0,5 W

Analog output (terminals 41-42) 420 mA (dielectric strength between electronic card and analog output:1kV) Minimum / Maximum resistance: 100 / 470

Distance for analog output ~ 200m

Digital output (terminals 3-4) Serial RS485 (for more information contact COMEM assistance dept.)

Distance for digital output ~ 500m Switch electrical data (according to EN50126-1/2) Breaking capacity Voltage(3) Current Breaking capacity

24 d.c. to 220 V d.c. 2 A for 1000 maneuvers 250 W L/R0.5

Dielectric strength of contacts Short duration power frequency withstand voltage 1 min kV (r.m.s.) Lightning impulse withstand voltage

kV (peak) Between circuits and earth 2 4

Between contacts in open positions 1(2) 3(2)

(1)For critical environmental conditions please contact COMEM (2)This test cannot be performed between the flow vanes contacts in open position in case they are connected to the electronic board (3)In case the flow vanes contacts are connected to the electronic board (see order sheet in the appendix D, line Flow vane contacts status verification via Modbus selected YES), the available voltages are:

x 24-48 V a.c/d.c. x 110-220 V a.c./d.c.

Table 1

5

2.4 Tests

Description Reference standard Description Reference standard

Fast transient/burs immunity test IEC 61 000-4-4 Immunity test IEC 61 000-6-2

Conducted disturbances IEC 61 000-4-6 Emission standard IEC 61 000-6-4

Electrostatic discharge IEC 61 000-4-2 IP degree - IP 65 CEI EN 60259

Power-frequency magnetic field IEC 61 000-4-8 Vibration Test IEC 60068-3-3

Surge immunity test IEC 61 000-4-5 Vibration Test CEI EN 60721-3-4 (Class 4M4) Harmonic current emission IEC 61 000-3-2 Low temperature IEC 60068-2-1

Voltage fluctuations and flicker IEC 61 000-3-3 Dry heat IEC 60068-2-2

Magnetic field immunity test IEC 61 000-4-3 Damp heat, cyclic IEC 60068-2-30

Supply variation IEC 61 000-4-11 Damp heat, constant IEC 60068-2-78

Table 2

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3. Installation eBR Electronic Buchholz Relay (1/D) is installed in the pipe (2/D) between the transformer tank (3/D) and the oil conservator (4/D). Make sure that the pipe and the eBR Electronic Buchholz Relay have the same nominal diameters. The red arrow on the cover at the top of the relay should always point towards the oil conservator. The eBR must initially be full of oil which means that the minimum oil level of the conservator must be higher than the discharge valve on the top of the relay (5/C). The recommended angle of inclination of the eBR pipework should be between 0 to 5 degrees. The pipe from the transformer to the eBR must exit the transformer at the highest point, it must be straight and the recommended length to the relay should be 10 times the internal diameter of the pipe (L1). The distance between the eBR and the conservator should be at least 3 times the internal diameter of the pipe (L2). Make sure that: x eBR must initially be full of oil which means that the minimum oil level of the conservator must be higher than the discharge valve

on the top of the relay (5/C). x Gases produced in the insulating liquid can flow unimpeded to the eBR x The red arrow on the eBR points to the conservator. x The flanges are stressed evenly when tightening the screws. x The slope of the pipe to the conservator is between 0 and 5. x The position of the eBR in relation to the direction of flow does not deviate from the perpendicular by more than 5. x The pipe has no elbows, and bends are designed preferably with an inside pipe radius R > 100 mm. x The free pipe length between the eBR and the tank should be at least 10 times the internal diameter x The free pipe length between the eBR and the oil conservator should be at least 3 times the internal diameter (Should the distance

exceed the above values, a support has to be provided in the immediate vicinity of the eBR).

CAUTION

The operating and installation requirements described in this manual must be strictly followed. If not, the device can be damaged or a malfunction may occur.

Fig. D

1 2

3

4

CAUTION

Make sure during installation that no dirt, moisture or foreign matters get into the relay. The insulating liquid of the transformer/reactor may not contain conductive materials!

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4. Electrical Connection

Multicore signal leads can be fitted in the Buchholz relay through cable glands (M25x1.5 3/E). A conductor cross section of 1.5 mm2 (copper) is recommended (4x1mm2 o 6x1mm2 shielded twisted pair cable for analog/digital output). The maximum cross section that can be clamped is 2.5 mm2. Proceed following the actions:

x Unscrew the 5 un-losable M5 screws M5 (1/E)

x Remove the cap (2/E)

x Insert the lead through the cable gland (3/E)

x Connect the lead to the terminal board (4/E) according to the chosen electrical scheme (tab.3-4)

Notes (1) See Annex B (2) NO: normal open contact (3) NC: normal closed contact (4) C.O.: change over contact (5) For other specific electrical scheme please contact COMEM

CAUTION

Electrical connections should only be performed by qualified and skilled personnel trained in the applicable health and safety regulations of the relevant country.

WARNING

Dangerous electrical voltages! It is imperative to deactivate the power supply during wiring of the device.

CAUTION

During the terminal box assembly, use caution not to damage the OR gasket. If this occurs it must be substituted. If you do not use all the 2 cable glands pay attention to close the free cable gland with a plug or gasket.

Fig. E

1

2

3

3

4

Scheme(5) Alarm level

Alarm Speed Trip

Analog output

MODBUS RTU

Petcock control (1)

F NO(2) NO NO Available Available On demand

K NO NO NC(3) Available Available On demand

Q NC NO NO Available Available On demand

R NC NO NC Available Available On demand

S NO NO C.O.(4) Available Available On demand

W C.O. NO NO Available Available On demand

X NC NO C.O Available Available On demand

U C.O NO NC Available Available On demand

Z C.O NO C.O Available Available On demand

Table 3

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Power supply (terminals 1-2): 24 Vdc 10% polarized Analog output (terminals 41-42): 420 mA - Minimum / Maximum resistance: 100 / 470 Digital output (terminals 3-4): RS485

x Tighten the cable gland

x Fit the cap

x Tighten 4 screws M5 (maximum torque 3 Nm)

Scheme F K Q R S W X U Z

24 VDC (+) 1 1 1 1 1 1 1 1 1

24 VDC (-) 2 2 2 2 2 2 2 2 2

RS485 (B) 3 3 3 3 3 3 3 3 3

RS485 (A) 4 4 4 4 4 4 4 4 4

GROUND

4-20mA (+) 41 41 41 41 41 41 41 41 41

4-20mA (-) 42 42 42 42 42 42 42 42 42

LEVEL ALARM

24 24 24 24 24 24

21 21 21 21 21 21

22 22 22 22 22 22 22 22 22

FLOW VANE

ALARM

31 31 31 31 31 31 31 31 31

32 32 32 32 32 32 32 32 32

TRIP

14 14 14 14 14 14

11 11 11 11 11 11

12 12 12 12 12 12 12 12 12

Table 4

NOTE

The inner side of the electrical cap accommodates a label with the electrical scheme. The schemes show the switching systems in their neutral position. The neutral position is the operating condition when the Buchholz relay is filled with insulating liquid up the required level and the device to be protected operates without any fault.

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5. Functional test The test can be performed with the help of a test key (mechanically) or by a special test pump (pneumatically). Perform the test while the eBR Electronic Buchholz Relay is filled with insulating liquid up to the required level. 5.1 Mechanical testing by test keys 5.1.1 Volume alarm verification 5.1.2 Trip verification

Proceed following the actions

x Remove the higher cap nut (1/F)

x Press the test key (2/F) (check of level alarm)

x Verification of correct function from the control room

x Release the test key

x Fit and tighten the higher cap nut

Fig. F

1

2

Proceed following the actions

x Remove the smaller cap nut (1/G)

x Pull toward the higher position the test key (2/G) (check of trip)

x Verification of correct function from the control room

x Push the test key (2/G) to re-arm the trip

x Fit and tighten the higher cap nut Damper functioning eBR Electronic Buchholz Relay with the feature damper held in response position are designed such that the damper after it was operated due to an unacceptable high flow rate of the insulating liquid is locked in its position and, hence is kept in this position even after the flow rate has been reduced. This means that the signal generated is

1

2

CAUTION

For electronic Buchholz relays the damper und hence the lower switching system has to be unlocked after the test by pushing the test key.

Fig. G

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5.2 Pneumatic testing by pneumatic valve This is performed by injecting air using a pump (furnished by COMEM on request as an accessory kit, causing the oil level inside the eBR to drop down and actuate the alarm float. Proceed as follows when using the kit:

x Remove plug (2/H), screw valve (3/H) and relative nipple on relay valve (1/H) x Remove cap (4/H), insert pump (5/H) using the threaded connection and turn the lever to OFF, inject air as necessary to

activate internal mechanisms. x To restore the oil level and simultaneously bleed out internal air remove plug (7/H) and open ball cock (6/H). x After these procedures close cock (6/H) and plug (7/H), remove pump (5/H) and relative accessories (3/H) and (4/H) and

close valve (1/H) using plug (2/H).

6. What to do in the case of gas accumulation In case of alarm, the gas should be checked immediately to determine the cause of the fault and avoid additional damages. To this end, withdraw the gas from the eBR and analyze it. For gas sampling and transport it is recommended to use the Gas Sampling device supplied by COMEM (see Annex C).

Fig. H

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7. Operation and maintenance The eBR Electronic Buchholz Relay is ready for immediate operation after installation, electrical connection and power supply. 7.1 Operation It is possible to detect the gas accumulation in different way:

x Checking the graduated windows x Checking the gas accumulation alarm signal x Continuously via analog output 4-20 mA x Continuously via digital output RS 485 (MODBUS RTU protocol)

It is possible to verify the dampers status:

x Checking the alarm/trip signal x Via digital output RS 485 (MODBUS RTU protocol)

It is possible to activate a relay (optional, see annex B) to switch an external electrical petcock

7.2 Maintenance The eBR Electronic Buchholz Relay is insensitive to ambient conditions, provided these conditions were considered when selecting the particular design of the Buchholz relay. Therefore, no special maintenance is required during operation. eBR should be inspected and tested at specified intervals as described in the maintenance instructions of the plant operator. COMEM recommends performing the following checks: x Check the exterior condition of the device x To verify the contacts function following the chapter 5 x Check the gaskets condition and if any leakage exists 7.3 Movement, transport and storage The eBR storage must remain in the original packaging and in a dry place with temperature range between -10C to 40C. Upon receiving the eBR, please check:

x The outer surface of the packaging to check that it is intact x That there are no breakages to the packaging

If damages are found, please contact COMEM, providing the data given on the shipping list and the serial number of the eBR. When you install the device please follow section 3, 4 and 5.

CAUTION

Not to paint the device. In this case any guarantees concerning the corrosion resistance decline.

Only mild soap and water should be used to clean the electrical box cover. Solvents must not be used for any reason as they will degrade the performance of the paint. Use of solvents on the unit will immediately void the warranty.

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Appendix A Modbus (RTU) Registers A.1 Addressing

DIPSWITCHES

ADDRESS 1 2 3 4

32 OFF OFF OFF OFF

33 ON OFF OFF OFF

34 OFF ON OFF OFF

35 ON ON OFF OFF

36 OFF OFF ON OFF

37 ON OFF ON OFF

38 OFF ON ON OFF

39 ON ON ON OFF

40 OFF OFF OFF ON

41 ON OFF OFF ON

42 OFF ON OFF ON

43 ON ON OFF ON

44 OFF OFF ON ON

45 ON OFF ON ON

46 OFF ON ON ON

47 ON ON ON ON

Table 5

This electronic Buchholz relay has a default address equal to 32 and its address can be changed from 32 to 47. It is not possible to give an address outside of range from 32 to 47. The address can be modified from default value by dipswitches on electronic board. The dipswitches involved are ones from 1 to 4 and they can be modified according to table 1.

Fig. I

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A.2 Registers Tables In the tables 6 are showed the visible via Modbus (RTU) registers. A.2.1 Main register Table REGISTER TYPE R/W FUNCTION

0x2000 W R Electronic board input

0x2001 W R/W Electronic board output

0x2002 W R Level probe value (mml)mml

0x2003 W R Operation number IN1

0x2004 W R Operation number IN2

0x2005 W R Relay operation number

0x2006 W R Time (minutes) electronic board switched on

0x2007 W R Time (days) electronic board switched on

0x2008 W R Max level current day

0x2009 W R Min level current day

0x200A W R Software version

A.2.2 Memory registers Maximum and Minimum values are stored and saved from register 0x2100 to register 0x215F. The last four weeks data (from current day) are stored and saved daily, at the beginning of the 5th week the maximum and minimum values of the entire older week are stored and saved in 0x2138 and 0x2139 registers and so on. Summarizing, in this table (7) the data are collected as follows: 1) In the first 28 rows are saved max and min of the latest 28 days; 2) In the remaining rows are saved max and min of the oldest 19 weeks. REGISTER TYPE R/W FUNCTION

0x2100 W R Level Sensor Maximum Value Day 1

0x2101 W R Level Sensor Minimum Value Day 1





.. .. ..





0x2138 W R Level Sensor Maximum Value Week 5

0x2139 W R Level Sensor Minimum Value Week 5

... ..

0x215C W R Level Sensor Maximum Value Week 23

0x215D W R Level Sensor Minimum Value Week 23

0x215E W R Level Sensor Maximum Value Week 24

0x215F W R Level Sensor Minimum Value Week 24

Table 6

Table 7

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A.3 Register Description A.3.1 Main Register Description 0x2000 Electronic board input This register shows the input status: BIT 0: shows the status of the input IN1 or JP10 (0=voltage on, 1 = voltage off). BIT 1: shows the status of the input IN2 or JP12 (0=voltage on, 1 = voltage off). BIT between 2 and 15: always 0. 0x2001 Electronic board output This register shows the output status: BIT 0: shows the status of the output JP13 (0=output switched off, 1 = output switched on). BIT between 1 and 15: always 0. 0x2002 Level probe value (mml)mml This register shows the level probe value. 0x2003: Operation number IN1 This register shows the operations of the input IN1 or JP10 (operation means the passage from switched on to switched off status) input status). This value can be from 0 to 65535 (from 0x0000 to 0xFFFF). 0x2004: Operation number IN2 This register shows the operations of the input IN2 or JP12 (operation means the passage from switched on to switched off status) input status). This value can be from 0 to 65535 (from 0x0000 to 0xFFFF). 0x2005: Relay operation number This register shows the operations of the relay (operation means the passage from switched on to switched off status) input status). This value can be from 0 to 65535 (from 0x0000 to 0xFFFF). 0x2006: Time (minutes) electronic board switched on This register shows the minutes passed from the last electronic board powering. This value can be from 0 to 1439 (from 0x0000 to 0x059F). After I it will reset. 0x2007: Time (days) electronic board switched on This register shows the days passed from the last electronic board powering. This value can be from 0 to 65535 (from 0x0000 to 0xFFFF). 0x2008: Max level current day This register shows the max level of the current day (this value will be saved in the EEprom when the day finishes). This value can be from 0 to 1023 (from 0x0000 to 0x03FF). 0x2009: Min level current day This register shows the min level of the current day (this value will be saved in the EEprom when the day finishes). This value can be from 0 to 1023 (from 0x0000 to 0x03FF). 0x200A: Software version This register shows the software version of the electronic board.

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Appendix B Petcock On demand the electronic eBR Electronic Buchholz Relay can be supplied with the possibility to manage via MODBUS an output relay. This output relay could be utilized for the gas discharge valve opening for example B.1 Connection The connection can be done directly on the electronic board following the picture below NO: normal opent NC: normal closed C: common B.2 Contact technical data Contact Specification

Rated current/Maximum peak current (A) 10/15

Rated voltage/Maximum switching voltage (V AC) 250/400

Rated load AC1 (VA) 2500

Rated load AC15 (230 V AC) (VA) 500

Breaking capacity DC1: 30/110/220 V (A) 10/0.3/0.12

Minimum switching load mW (V/mA) 300 (5/5)

Technical data

Mechanical life AC/DC (cycles) -/10x106

Electrical life at rated load AC1 (cycles) 100000

Operate/release time (ms) 6/4 Insulation between coil and contacts (1.2/50 s) kV 6(10 mm)

Dielectric strength between open contacts (V AC) 1000

Ambient temperature range C -40 +80C

Fig. L

Table 8

NO

NC

C

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Appendix C Gas Sampling Device C.1 DRAWING C.2 CONSTRUCTION The COMEM Gas Sampling device is manufactured from an aluminum alloy casting with the following fittings:

x A tempered glass inspection window with graded markings for volume indication.

x A gas sampling valve (2/M).

x A bleed valve (3/M).

x A gas inlet valve for pneumatic testing (5/M).

x A valve for draining oil from the relay (this can be mounted on the right or left hand side of the body (6/M) or (7/M). As a routine test all castings are tested by injecting ambient air at 2.5 bar for 2 minutes. A certificate to this effect is supplied with the unit. For the sake of standardization the device is fitted with the left and right hand valve supports but only one valve. Customer can then choose which side he prefers.

x With fittings for outside dia. 6 tubes, code 1RDPG00006 (on request);

x with fittings for outside dia. 8 tubes, code 1RDPG00007 (on request);

x with fittings for outside dia. 10 tubes, code 1RDPG00005 (standard).

Fig. M

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Appendix D Order Sheet

Size and Model BR80 BS80

Electrical scheme (see chapter 4)

F K Q

R S W

U Z X

Seal NBR -40C HNBR VITON

Flow Speed

Alarm 1.0 / 1.5 / 2.0 / 2.5 m/s

Speed 1.0 / 1.5 / 2.0 / 2.5 / 3.0 m/s

Flow vane contacts status verification via Modbus

YES NO

Contact supply 24/48V AC/DC 110/220V AC/DC

Table 9

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Appendix E Figure and Reference number key Picture Description A eBR 80 overall dimension B Internal frame (floats and flow vanes position) C Buchholz relay cover D Buchholz relay installation E eBR terminal board F Alarm volume mechanical test G Trip mechanical test H Pneumatic testing I Dip switches L Petcock connection on the electronic board M Gas sampling device Picture Number Description

A

1 Electronic Buchholz relay graduated windows 2 Drain plug 9 Electrical box cover 10 Cable gland M25x1.5

B 3 Floats 4 Flow vanes

C

5 Discharge valve 6 Pneumatic valve 7 Mechanical test key (alarm) 8 Mechanical test key (trip)

D

1 Buchholz relay 2 Pipe 3 Transformer tank 4 Transformer conservator

E

1 Un-losable screw 2 Electrical box cover 3 Cable gland M25x1.5 4 Terminal board

F 1 Mechanical test key cover (alarm) 2 Mechanical test key (alarm)

G 1 Mechanical test key cover (trip) 2 Mechanical test key (trip)

H

1 Pneumatic valve 2 Plug 3 Screw valve 4 Cup 5 Pump 6 Discharge valve 7 Plug

M

1 Upper GSD discharge valve 2 Gas sampling valve 3 Bleed valve 4 Lower GSD discharge valve 5 Valve for pneumatic testing 6 Valve for draining oil 7 Valve for draining oil 8 Upper Buchholz relay discharge valve 9 Lower Buchholz relay discharge valve 10 Pipe 11 Pipe

Table 10

Table 11

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Strada Regionale 11, Signolo 22 36054 Montebello Vic.No (VI) - Italy

Tel. +39 0444 449311 - Fax -39 0444 449352 440359

http://www.comem.com e-mail:[email protected]

Manuale Flow Relay

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