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User manual - Annex II

High Voltage Instrument Transformers | DDB/DFK/DDN/DFN

ANNEX II

SCREW

TYPE

TORQUE WRENCH SETTING (Nm)

USE

TORQUE WRENCH SETTING

M12/16/20

Fixing the insulator to the base

30 Nm

M12

Support between capacitor units

30 Nm

M12

Insulator fl ange to intermediate plate

30 Nm

M6

Connection cable between capacitor units

12 Nm

M8

Tank Lid

30 Nm

M8

Primary Terminals

20 Nm

M8

Secondary terminals (if they are of the screw type)

12 Nm

M6

Grounding (inside secondary terminal box)

12 Nm

M10

HF terminal

12 Nm

M6

Cable gland

12 Nm

M8

Terminal Block Cover

20 Nm

M6

Bottom closing lid of the terminal block

12 Nm

TIGHTENING TORQUES

NOTE: If a torque diff erent from that indicated in this table is indicated on the drawing or plates of the equipment, the torque indicated on the drawing 
or plate must be applied.

Содержание DDB Series

Страница 1: ...NTENTS PRELIMINARY CONSIDERATIONS INTRODUCTION TRANSPORT AND HANDLING INSTALLATION INSPECTION AND MONITORING QUICK TROUBLESHOOTING GUIDE ANNEX I ANNEX II ANNEX III HIGH VOLTAGE INSTRUMENT TRANSFORMERS DDB DFK DDN DFN ...

Страница 2: ...improper use o handling may result in physical damage to the equipment serious injury or even death SAFETY PRECAUTIONS For safety reasons only qualified personnel can carry out maintenance and commissioning or operation Read the instruction manual and other documents before using the equipment Become acquainted with every aspect of the equipment and its safety precautions before using it Do not use...

Страница 3: ...eactance and auxiliary elements The tank is fitted with a box containing the secondary terminals and the adjustment compensations they are protected by a sealed cover Oil volume variations in the capacitor unit s are compensated for in one or more metal diaphragms located at the top of each unit In the inductive part tank the oil level is displayed by a direct indicator Each insulator is hermetical...

Страница 4: ...nstruction site Unpacking Remove the top and sides of the box to allow free handling of the unit Annex I contains the figures mentioned below The movements are to be carried out as shown in fig 1 For transformers consisting of a single capacitor unit the slings must be placed in the holes prepared for this purpose in the base and before lifting the screws that join the unit to the base of the packag...

Страница 5: ...essarily the result of a leak In most cases the stains are nothing more than oil residues from the manufacturing process The stain should be cleaned with a degreaser and the equipment should be kept under observation If the stain reappears or spreads contact the manufacturer TRANSFORMER MOUNTING when the unit consists of several capacitor units The assembly of the transformer made up of several ca...

Страница 6: ...cted to the ground terminal of the housing fig 8a If there are carrier accessories this high frequency HF terminal shall be connected to the carrier accessory block While this equipment is not in use the grounding switch must remain closed fig 8b A faulty contact or a bad connection can lead to rapid transformer deterioration Avoid excessive torque as the connector may suffer damage such as cracks w...

Страница 7: ...r the test procedure see Annex III 3 Thermographic testing e Use of thermographic cameras ARTECHE offers a diagnostic service for capacitive voltage transformers in the field More information www arteche com INSPECTION AND MONITORING DANGER ELECTRIC SHOCK AND OR INJURY Everything should only be carried out by personnel who is qualified in the maintenance and verification of the equipment Do not touch...

Страница 8: ...mary terminals surrounding area Dielectric tests D1 PF DDF tgδ The limit values of this parameter depend on the transformer s voltage level The recommended values are given with the order It is also important to control this parameter s change over time A change in the value of this parameter indicates a change in the properties of insulation but it is not definitive proof of faulty insulation For ...

Страница 9: ...sts contact ARTECHE Loose junctures Tighten the screws and bolts clean the area and keep it under observation If the leak persists contact ARTECHE Cracks or damage to components Contact ARTECHE Non visible oil level Oil leakage or overpressure Remove the transformer from service and contact ARTECHE Cracks in resin parts Blows or improper handling Contact ARTECHE When What On arrival of the transfo...

Страница 10: ...User manual Annex I High Voltage Instrument Transformers DDB DFK DDN DFN ANNEX I DDB 72 170 HANDLING AND CONNECTION DFN 245 765 DFK 245 765 DDN 72 170 ...

Страница 11: ...K DDN DFN 1a 1b 1c 1d Fig 2 Loosen only these screws Fig 1 Handling FIXING SCREW 4 FIXING SCREWS DO NOT TOUCH OILTIGHTNESS DO NOT TOUCH OILTIGHTNESS THE UNIT IS FIXED BY MEANS OF THE 4 FIXING SCREWS 4 NUTS ARE USED TO FIX IT TO THE PACKAGING REMOVE THEM FOR UNPACKING ...

Страница 12: ...2 User manual Annex I High Voltage Instrument Transformers DDB DFK DDN DFN Fig 3 Protective cover Fig 5 Assembly between capacitor units Fig 4 Connection cable for capacitor units ...

Страница 13: ...B DFK DDN DFN Fig 6 Level indicator Fig 7 Neutral grounding connection Fig 9 Short circuit cable of capacitor unit Remove only before energizing Fig 10 Grounding switch Fig 8b HF connection with carrier accessories Fig 8a HF grounding without carrier accessories ...

Страница 14: ...e between capacitor units 12 Nm M8 Tank Lid 30 Nm M8 Primary Terminals 20 Nm M8 Secondary terminals if they are of the screw type 12 Nm M6 Grounding inside secondary terminal box 12 Nm M10 HF terminal 12 Nm M6 Cable gland 12 Nm M8 Terminal Block Cover 20 Nm M6 Bottom closing lid of the terminal block 12 Nm TIGHTENING TORQUES NOTE If a torque different from that indicated in this table is indicated...

Страница 15: ...ity system certified under ISO 9001 However it is normal for pre operative tests to be performed in order to confirm certain important equipment values The following is a guide to the most common on site tests and the proper way to perform them on ARTECHE brand transformers This annex applies to the following equipment Capacitive Voltage Transformers DDB Series Models DDB 72 170 Capacitive Voltage T...

Страница 16: ...2 Disconnect the HF connection to ground The HV power cable of the measuring equipment must be connected to the primary terminal A H1 The measurement cable must be connected to the high frequency terminal HF C1 High voltage capacitance The high voltage capacitance C1 corresponds to the part of the capacitor connected between the line terminal number 1 in the fig 1 and the intermediate voltage termi...

Страница 17: ...e connected to the lower flange of the capacitor unit Test procedure for the lower capacitor unit Disconnect the HF connection to ground The HV power cable of the measuring equipment must be connected to the primary terminal A H1 or the higher flange The measurement cable must be connected to the high frequency terminal HF 1 3 TERMINAL A H1 10 kV Cn FP GST GND AF HF TERMINAL A H1 10 kV C1 FP GST GND...

Страница 18: ...e It is not recommended to repeat this test often as the internal insulation could be damaged INSULATION RESISTANCE MEASUREMENT CAPACITIVE VOLTAGE TRANSFORMERS Neutral against Secondaries Ground N S G The line cable of the measuring equipment must be connected to the terminal N H2 disconnecting the grounding link of the primary winding The ground cable of the measuring instrument must be connected...

Страница 19: ...SFORMER RATIO TEST This test verifies the transformer ratio and polarity and displays a signal if correct and a signal if inverted To carry out the test proceed as follows fig 5 The excitation terminals clamps marked H will be connected to the transformer s primary circuit H1 will be connected to the primary terminal of equipment A H1 H2 will be connected to the ground terminal located at the base o...

Страница 20: ...User manual Visit our website at arteche com for more information ARTECHE Subject to changes without notice MU_HV_DDB_DFK_DDN_DFN_EN V A0 09 04 2021 ...

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