05 security and control#

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SECURITY AND CONTROL

Oil level indicator

1. TYPE

032-003-11 (1 x NO/NG -min.)032-049-11 - codenr. 0696-545 (2 x NO/NG

min+max)

2. PURPOSE

Control of oil level in conservator.

3. CHARACTERISTICS

3.1 . MECHANICAL:

-for outdoor installation (IP 54)

- aluminiumcasing

-painting RAL 7033

3.2 . ELECTRICAL:

-test voltage: 2 kV/1 min.

- screw for earth connection in the indicator

4. OPERATION

Principle:

Radial floatmovement is transmitted to a drivingmagnet, a second magnet is connected with thedial hand.

5. DESCRIPTION

Flange:

- anti-magnetic, non-porous metal. Driving magnet:- built into metal case, protected against foreign fields.

Float:- material : Nitrophyl.

Dial:-max.;+ 20 o C; min.- yellow indicationson black background.

05 Security and Control

Contacts:

-Change over contact(s).

Diagram:

~ : = r @ T

MIN MAX

Switching power :

Rated voltage Switching power

250V-- 15A

50-60Hz125 V= 0,5A not

250V= 0,25A inductive

6. ADJUSTMENTS

-minimum (321-003-11)

-minimum+ maximum (032-049-11)

7. ELECTRICAL CONNECTION

- terminal : max. 4 mm2

-cable entry: PG 16

8. MOUNTING

-mounting flange on conservator (4 bolts M 12),indication ''TOP" top side.

-mount float

-mount case on flange (4 bolts)

9. MAINTENANCE

At least once a year :- check the contacts- check the electrical connection- tighten the compression gland

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65 25 max.I

I--;-.,

~ d+--f}- I

I 55 ~ L / Jll 0(') ~ :::t:: Il l co'lSl 1"-'ln..-l:.J. - .,..I

-.= r ~ - T - -

--1 - - - - t - - - - lSl 0!

L..el "'$- ~I

I' 0 3- : . -I

~ 4 - rl)

I : I'I . - - .(. - - i..

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Buchholz relay

1. TYPEAG25BG25BF 50/10BF 80/10

2. PURPOSE

Code number 0241/020Code number 0241/022Code number 0241/024Code number 0241/026

To detect defects in oil-cooled conservator-equippedtransformers.

3. CHARACTERISTICS

3.1. MECHANICAL

-According to Din 42566-For outdoor installation. (IP 44)- Light metal-alloy casing.- Built-in mechanism mainly made of steel.- 1 of 2 (synthetic) floats and a chock valve.- Different type according to the transformers' ratedpower:25$5000kVa

50;:::5000 kVa $10000 kVa80 ;:::1 0000 kVa-Ventilation in terminal box-Sighting glasses for checking of the built-in system.-With oildrain valve in the bottom-Vibration-proof: 10 g (10 m/s)

3.2. ELECTRICAL

-Test voltage: 2 kV/1 min.- 1 or 2 contacts (signalization and/or switch off)- Earth connection inside and outside of the ter-

minal box.-2 coupling nuts Pg 16. 4. OPERATION- Normal condition : Buchholz completely filled with0il.- Small gas development: upper float moves thesignal contact.- Heavy gas development: causes oil displacement;shock valve moves the trip contact.- Oil level drops: upper float first operates the signal contact; in case the oil level drops still further, the lower float will then operate the trip

contact.


5. DESCRIPTION5.7. CHOICE AND EXPLANATION OF THE TYPE NAME:

A : Buchholz with 1 float (1 contact)B : Buchholz with 2 floats (2 contacts)G : fixing by means of screw-thread R11/2".F : fixing by means of flanges25 : inner diameter of inlet and outlet (25 mm)50 : ditto (50 mm)80 : ditto (80 mm)/10 : rated pressure 1 0 kp/cm (in connection

the flanges)

5.2. CONTACTS

- normally open-magnetic operated switches- switching power

Rated voltage Rated current

~ 4 - 2 3 0 V- 50-60 Hz ~ Aco s phi ;::: 0,2

~ 4 - 2 3 0V= ~ A r$ 10 0 ms

6.SENSITIVITY OF THE DAMPER- with 1 float : 1 m/s- with 2 floats : 1.5 m/s

7. CHANGING THE POLARITY OF THECONTACTS (SEE FIG.1)That is, change NO-contacts to NC :- dismount case : for this purpose unscrew the

six bolts (2 in the terminal box)- Loosen the fixing bolts (indicated in fig.1) adjusted to "S" (Schliesser), turn magnet till boltsis adjusted to "0" (Oeffner), fasten.

8. ELECTRICAL CONNECTION-Terminals 23-24: switching-off

13- 14: alarm-Wire max. 4 mm 2

9. MOUNTING-I n the duct between tank and conservator.-As close to the transformer as possible-Arrow indicator on relay pointing to the conservator.- Connecting pipe and Buchholz relay risingangle: max. 5- min.1 -Fixing: 4 bolts M16 per flange. 10.

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10. TESTING

-By means of a test button: push in button; thealarm contact and the trip contact are moved.- By means of a pump: pump air into Buchholz viathe air release plug till the alarm contact works.- Check contacts: remove the locking plug from thetest button if they are in a position other thanprovided.

11 . MAINTENANCE

At least once a year :- Check the contacts- Check the connections, tighten them ifneed be.-Also tighten the compression glands.


12. MAKING USE OF THE BUCHHOLZ RELAY

Switch the transformer off and take a gas.- Gas incombustible, acetylene test negative :gasses are air rests, transformer can be switchedon again. Air invades the transformer: look for thedefect.- Gas combustible, acetylene test positive : trans-former shows signs of an electrical defect whichshould be tracked down immediately.- No gas escapes, air is sucked in by open screw,oil level drops: oil level too low, add oil, fix anyleakages.

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Buchholz Relay



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Thermal image

1. TYPE

Thermometer: MT- ST160 F (2 cts.) -code0697/043

Thermometer: MT-ST160 F (4 cts.) -code0697/063Protection cap : 1 " -code 0697/07 4 2.

2.PURPOSE

To measure the winding temperature by means ofindirect measurement.

3. CHARACTERISTICS

3.1. MECHANICAL

-For outdoor installation, IP 55, tropical design.- Thermometer casing : sheetsteel, galvanised.

- Painting RAL 7033.-Capillary line, length 6 m, with PVC mantle.- Cableglands : 4 x PG 16- brass .- Compensated up to an ambient temperature of

- 40Ctill +80C.- Max. humidity: 80 %.-Max. height: 2000 m.- Mounted with vibration damper.- Earthquake resistant till2 g.

3.2. ELECTRICAL-Test voltage: 2,5 kV/1 min.- Capillary electrically insulated.- Secondary current transformer 5 A- Screw for earth connection in the apparatus.

4. OPERATIONMeasures the winding temperature by means ofsimulation.The volumetrical expansion of the capillary liquiddrives the measuring unit.The sensor is heated by the oil and a resistance fedby a current transformer (mounted under oil).Temperature difference between winding and oil issimulated by current adiustment bV means of theheating resistance.Independent of the external feeding.


5. DESCRIPTION

5.1. PRINCIPLE

Detailed drawing1. casing for terminal image1a.sensor1 b. heating resistance1 c. adjustment resistance2. transformer2a. transformer winding2b. current transformer3. indication

r - - - - - - - - - - - ,

1c

-- - .,

3

: - - jI

'I I . 1 b I... - f. - ... ...

1a1

I2a

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5.2. SCALE-Linear : -20C t i l l +14 0C.-Accuracy: 2 o C.-Black indications on white background. 5.3.

MAX POINTER-Color: red.- Indicates the max. reached temperature.- No de-regulation of the measuring unit whensetting back; please don't push the pointer withthe calibration pointer to a lower indication !

5.4. CONTACTS- NO/NG contacts adjustable over complete dial.(max. 4NO/NG-contacts)- Switching difference : 2%.

-Switching power:

Voltage Current

Resist. load. Induct. load.

250V/40-60 Hz 5 A 2,5A

110V= 0,4A 0,15A

250V=( option) 0,1 A (option)

5.5. DISTANCE INDICATION (OPTION)-B y a ZT-F1 temperature indicator by means of aPt1 00-measuring (option).

6. TEMPERATURE ADJUSTMENTS

General Temperature adjustments

averaQe alarm 105 ocambient temp.

trip 120 oc-- --temperature rise ON 95C

coolingin oil60 oc OFF 85C


7. CONTACT ADJUSTMENTS-Dismount frontring (bayonet catch) with leftturn:glass, with max. indicating pointer, is fastened tothe frontrina.- Contacts can now be changed.- Turn indicating pointer clockwise and check thecontacts.- Remount glass and frontring.

8. ADJUSTMENT- Heating resistance is adjusted and can not bechanged anymore.-Indication can be adjusted by means of screwon dial (max. 5 C).

9. ELECTRICAL CONNECTION

- Current transformer lead through transformercover by means of epoxy terminals.-Contacts of temp. simulator: min. 0,25 mm 2 , max.2,5 mm 2 .

10. MOUNTING

10.1 . THERMOMETER:

- Case: 2 bolts MS,horizontal distance between their axes 140 mm- Capillary line:

. unroll without impairing or breaking,

. fold angles with min. 10 mm radius; . fixat 300mm ;

. roll up the rest with a 150 mm diameter.

10.2. CASING FOR TEMP SIMULATOR-Sensor:

. mount heating resistance sideways in themilled protection cap

. fill DIN thermometer pocket with transformeroil (50 ml 10%)

. screw protectioncap (with heating resistance)

in the DIN thermometer pocket.. push the sensor through the compression

gland at the foot of the protection cap . screw onthe compression gland-Connect heating resistance and current transformer to the terminals according to the diagram.

11. TESTING-Open apparatus (cfr. pnt. ?Adjus tments ).- Heatup sensor.-Test contacts.

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12. MAINTENANCE

At least once a year:

- Check the contacts.- Check electrical connections, iften.- Ifnecessary fasten compression glands.

13.DEFECTS

-Indication does not change: heating upno reaction = capillary interrupted;replace thermal image.

- Other defects: replace thermal image.


p(W) Heating resistance : 0,620 Qlc r = 5 A (max.)

1 6 ~ - - - r - - - - . - - - - . - - - - , - - - ~

1 5 ~ - - + - - - 4 - - - ~ - - - + - - ~ ~ '

1 4 1 - - - 1 - - - - - - 1 1 - - - - - - 1 1 - - - 1 - - + / - l

I I1 3 1 - - - 1 - - - - - - 1 1 - - - - - - 1 1 - - - 1 - / + - - l1 2 1 - - - i - - - - - - 1 1 - - - - - - , 1 - - - l ' t - 1 - : - - 1

1 1 r - - - - - + - - - - + - - - ~ r - - - - 7 1 ' ~ 1 - - - - ~

1 0 ~ - - ~ - - - - + - - - - + - - 7 - , _ - - ~

I' I9 ~ - + - - ~ - - ~ v ~ - + - - ~8 1 - - ~ - - - + - - - r / - - - r - - ~

7 ~ - + - - ~ - ~ + 4 - - - + - - - l

i6 ~ - 4 - - - + v ~ - r - - ~ - - ~5 ~ - 4 - - - + v - - - r - - - ~ - - - - ~

4 1 - - ~ - / - r ~ - - + - - - r - - - l

3 r - - - ~ / ~ - - r - - - - r - - ~ - - ~

2 / _

1 /

t IdA)-r - 5

- 1- 4

- - 3

_,_ 2

10 20 30 40 50 ~ W C )

~ t :temperature rise in ec referred to top-oilP(w): power supply of the current transformer to the

heating resistance11 : current supply by the current transformer

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Switch 1red

Switch 2blue\

' - - - r - - - . . . 1 .


Switch 3,_ - - - " ' & L - - ~

26 i~ ~Switch4yellow

; . . - - - - - - - - ;

Vibration damper

_ _ _ Pointer

Adjustercalibration pointer

Aeration

- - - - ~ , - - - - - - - - - - - , _ J- - f - - - - - - - - - 3 f

\P916

S+

__ j _

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Silicagel air dryer

1 . T Y P E

DIN 42567DIN 42562E5H

code 0693/040

EH6"MAIER"

2 . P U R P O S E

0693/0300693/0100693/0110693/050

To protect transformer oil against humidity.

3. OPERATION

Underpressure develops when oil temperature inthe transformer drops.Moist outside air is sucked in via the oil lock andpasses through the drying medium. Air reachedthe transformer dry. Overpressure develops whenthe oil expands. This process forces the air fromthe conservator via the air dryer.

4. FABRICATIONComposed of a cylindrical glass holder filled with adrying medium and locked up at the bottom bymeans of an oil lock.A sieve at the lower edge of theholder prevents contact between oil in the oil lockand drying medium.The drying medium:Is called "blue-gel". It is of glassy nature, almostchemically neutral and has got a great absorptivecapacity. It is a silicagel that, drenched in cobalt salt,has got an azure crystalline appearance in drycondition. In this condition it absorbs 40% of its ownweight in water. When humidity increases, the bluecolor changes to red. When the fill is completelyre-colored it should be renewed.

AVOID CONTACTBElWEEN OIL AND DRYINGMEDIUM,OTHERWISETHE BLUECOLORCHANGESTO BROWN ORBLACKWHEN DRY-ING THE MEDIUM.THIS MAKES CONTROLIM-POSSIBLE.


5.MOUNTING

The DIN air dryers and "MAIER" are mounted tothe tube lining by means of flanges.The HH type is mounted with a wire connection 01"G.

6. RENEWING THE FILL

This must be accomplished quickly.Transport is done in dry and airtight packing.DIN 42562: Loosening nut (26) unlocks the oil

lock.EH 5/6/7: Loosen nuts (22) to free silicagel holder

(5).DIN 42567: Remove oil lock (4) by loosening

guard (5). Loosen nut (12) in order tofree holder (7).

The numbers refer to the drawings in the appendix.- The upper cover is constructed in such a way

that emptying (respectively filling) the holder isnow possible.

"MAIER":-Unscrew CAP on lower part (item 1) for empty

ing.- Unscrew CAP on upper part (item 2) for filling.

Important note:After filling with new and dry silicagel it is requiredthe check the oil level in the oil lock on the bottom ofthe air dryer also. Each type of silicagel dryer isprovided with marks, indicating the proper oil levelduring operation.

7. REACTIVATING OR RETRIEVING OF "BLUE-GEL'

This occurs at temperatures between 12 C and200 C. Any pure gas can be used to heat the silicagel. Pure smoke gas from a gassy fuel or hot airunder a pressure of 100-200 WC also give satisfaction.It is also possible to heat the blue-gel in a meltingpot by means of one fuel or another. This processcan be accelerated by stirring the gel. Drying

comes to an end when blue-gel has regained itsoriginal blue color

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loft...

N+ I

22

I=I

DIN 42567

D

EH 5, EH 6, EH 7


C>c:>...

+I

Typ

EH5

EH6

EH7

A

1"

1"

1"

D H

166 290

166 450

166 650

156

DIN 42562

Silicagel Oil weightkg tranf. kg

1,70 10000

3,40 20000

5 30000

Weightkg

5

7,3

10,15

c:>...

...

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05 security and control#

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