TESTING, MAINTENANCE & PROTECTION OF DISTRIBUTION TRANSFORMERS

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● TESTING, MAINTENANCE & PROTECTION OF DISTRIBUTION TRANSFORMERS
● WHAT IS A TRANSFORMER?
● TYPES OF TRANSFORMER
BY APPLICATION
● DISTRIBUTION TRANSFORMER
● MAIN FEATURES
● PARTS OF TRANSFORMER
● TESTING OF TRANSFORMER
● TYPE TESTS
● SPECIAL TESTS
● ROUTINE TESTS
● TYPE TESTS
● SPECIAL TEST
● MAINTENANCE OF TRANSFORMER
● MAINTENANCE PROCEDURE
● MAINTENANCE
● PROTECTION OF TRANSFORMERS
● FAILURES & CAUSES

نوع زبان: انگلیسی حجم: 3.06 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 47 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/05/17 08:02:17

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

., test, transformer, voltage, wind, measurement, routine, hv, lv, current, impulse, ratio,

توجه: این مطلب در تاریخ 2019/05/17 08:02:17 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://transformertesting.info/dloadable/testingmaintenanceprotection2.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., test, transformer, voltage, wind, measurement, routine, hv, lv, current, impulse, ratio,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

testing maintenance protection of distribution transformers presented by prashant p. nankar trans delta electricals what is a transformer transformer is a static device which transforms a.c. electrical power from one voltage to another voltage keeping the frequency same by electromagnetic induction. types of transformer by application ۱. distribution transformer ۲.power transformer ۳.current transformer ۴.potential transformer ۵.furnace transformer ۶.booster transformer ۷.rectifier transformer ۸.locomotive transformer ۹.mining transformer ۱ .phase shifting transformer ۱۱.welding transformer ۱۲.high voltage testing sc testing trf. ۱۳.grounding transformers ۱۴.converter transformer distribution transformer transformer which is used for the purpose of distribution of power. ۱۱kv ۴۳۳v is the standard voltage rating. standard kva ratings are ۲۵ ۶۳ ۱ ۱۶ ۲ ۲۵ ۳۱۵ ۴ ۵ ۶۳ ۷۵ ۱ ۱۲۵ ۱۵ ۲ ۲۵ kva. is ۲ ۲۶ is the national i s standard. main features outdoor oil cooled ۳ phase ۵ hz primary is delta connected and secondary is star connected. naturaly cooled onan type . amongst all the types of transformers this is the most required and most used type. parts of transformer main tank radiators conservator explosion vent lifting lugs air release plug oil level indicator tap changer wheels hv lv bushings filter valves oil filling plug drain plug cable box testing of transformer testing is carried out as per is ۲ ۲۶. routine type tests special tests routine tests to be carried out on each job ۱.measurement of winding resistance ۲.measurement of insulation resistance ۳.seperate source voltage withstand test high voltage tests on hv lv ۴.induced over voltage withstand test dvdf test ۵.measurement of voltage ratio ۶.measurement of no load loss current. ۷.measurement of load loss impedence. efficiency regulation ۸.vector group verification ۹.oil bdv test. ۱ .tests on oltc if attached type tests these tests are carried out only on one transformer of the lot. all routine tests additionally following tests are included in type tests lightening impulse test. temperature rise test special tests additional impulse test short circuit test measurement of zero phase sequence impedance test. measurement of acoustic noise level. measurement of harmonics of the no load current. magnetic balance test. routine tests ۱.measurement of winding resistance this test measures the resistance of the hv lv winding. the values of resistance should be balance for all three phases and should match the designed values. equipment used digital resistance meter. routine tests ۲.measurement of insulation resistance measures the insulation resistance of hv lv windings with respect to earth body and between lv hv winding. insulation tester or megger is used. recommended values are ۲ mohms for hv ۵ mohms for lv. routine tests ۳.seperate source voltage withstand test high voltage tests on hv lv this test checks the insulation property between primary to earth secondary to earth and between primary secondary. hv high voltage test lv winding connected together and earthed. hv winding connected together and given ۲۸ kv for ۱۱kv transformer for ۱ minute. lv high voltage test hv winding connected together and earthed. lv winding connected together and given ۳ kv for ۱ minute. equipment used high voltage tester ۱ kv ۳kv routine tests ۴.induced over voltage withstand test dvdf test this test checks the inter turn insulation. for a ۱۱kv ۴۳۳v transformer ۸۶۶ volts are applied at the ۴۳۳v winding with the help of a generator for ۱ minute. this induces ۲۲kv on ۱۱kv side. the frequency of the ۸۶۶v supply is also increased to ۱ hz. equipment used motor generator set routine tests ۵.measurement of voltage ratio this test measures the voltage ratio as per the customer’s requirement. v۱ v۲ n۱ n۲ the voltage ratio is equal to the turns ratio in a transformer. using this principle the turns ratio is measured with the help of a turns ratio meter. if it is correct then the voltage ratio is assumed to be correct. equipment used turns ratiometer routine tests ۶.measurement of no load loss current. the iron losses and no load current are measured in this test. the ۴۳۳v winding is charged at ۴۳۳v supply the ۱۱kv winding is left open .the power consumed by the transformer at no load is the no load loss in the transformer. effect of actual frequency must be taken into account. equipment used wattmeters or power analyser. routine tests ۷.measurement of load loss impedence. efficiency regulation this test measures the power consumed by the transformer when the ۴۳۳v winding is short circuited and the rated current is passed through the ۱۱kv winding. equipment used wattmeters or power analyser. routine tests ۸.vector group verification test this test verifies the dyn ۱۱ vector group of a distribution transformer. equipment used voltmeter. routine tests oil bdv test. oil breakdown voltage is checked as per is ۳۳۵. ۱ mm l x ۷ mm b x ۸ mm ht. glass pot. ۵ ml oil sample. spherical electrodes with gap of ۲.۵ mm recommended value ۶ kv equipment used oil bdv test set. type tests lightening impulse test all the dielectric tests check the insulation level of the job. impulse generator is used to produce the specified voltage impulse wave of ۱.۲ ۵ micro seconds wave one impulse of a reduced voltage between ۵ to ۷۵ of the full test voltage and subsequent three impulses at full voltage. for a three phase transformer impulse is carried out on all three phases in succession. the voltage is applied on each of the line terminal in succession keeping the other terminals earthed. the current and voltage wave shapes are recorded on the oscilloscope and any distortion in the wave shape is the criteria for failure. special test short circuit withstand ability test. this tests measures the ability of the transformer to withstand the mechanical and thermal stresses caused by the external short circuit. hv terminals are connected to the supply bus of the testing plant. the lv is short circuited. the testing plant parameters are such adjusted to give the rated short circuit current. supply is made on and closed after specified duration of short circuit. the record of current wave form is noted. there should not be any mechanical distortion fire to the transformer during this test. …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., test, transformer, voltage, wind, measurement, routine, hv, lv, current, impulse, ratio,

این فایل پاورپوینت شامل 47 اسلاید و به زبان انگلیسی و حجم آن 3.06 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/17 08:02:17 استخراج شده است.

http://transformertesting.info/dloadable/testingmaintenanceprotection2.ppt

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