Tan Delta Tester yog ib qho cuab yeej tseem ceeb rau kev sim cov rwb thaiv tsev zoo ntawm transformer bushings. Kab lus no yuav piav qhia txog cov txheej txheem rau kev ua Tan Delta (C&DF) cov kev sim ntawm 220/132kV transformer bushings.
1. Kev npaj kev nyab xeeb
1.1 Pre-test Safety Requirements
- Tau txais daim ntawv tso cai ua haujlwm thiab tshem tawm
- Xyuas kom cov transformer thiab bushings yog cais kiag li
- Txhim kho av kom raug
- Tsim kom muaj kev tiv thaiv kev nyab xeeb thiab cov cim ceeb toom
- Txheeb xyuas txhua tus neeg ua haujlwm muaj PPE tsim nyog
- Ntxuav bushings kom huv si ua ntej kuaj
1.2 Cov khoom siv yuav tsum tau muaj
- Lub zog Factor (Tan Delta) kuaj teeb (12kV yam tsawg kawg nkaus li ISA TDX5000 thiab lwm yam)
- Coj mus rhaub adapter rau bushing kais txuas
- Kuaj cov hlau lead thiab cables
-Grounding cables
- Kub thiab humidity meters
- Cov ntaub ntawv pov thawj
- Cov ntawv xeem cov ntaub ntawv
2. Kev Xeem
2.1 Environmental Requirements
- Ambient kub: 10 degree txog 40 degree
- txheeb ze humidity: <85%
- Tsis muaj nag los yog condensation
- Bushing nto yuav tsum huv si thiab qhuav
- Sau cov roj kub rau kev kho yam
3. Test Configurations
3.1 220kV Bushings Test Hom
1. UST Hom (C1 Test)
- Txuas qhov ntsuas hluav taws xob rau bushing kais
- av bushing conductor thiab tank
- Ntsuas C1 capacitance thiab Tan δ
2. GST hom (C2 Test)
- Txuas qhov ntsuas hluav taws xob rau bushing conductor
- Hauv av bushing kais thiab tank
- Ntsuas C2 capacitance thiab Tan δ
3.2 132kV Bushings Test Hom
1. UST Hom (C1 Test)
- Txuas qhov ntsuas hluav taws xob rau bushing kais
- av bushing conductor thiab tank
- Ntsuas C1 capacitance thiab Tan δ
2. GST hom (C2 Test)
- Txuas qhov ntsuas hluav taws xob rau bushing conductor
- Hauv av bushing kais thiab tank
- Ntsuas C2 capacitance thiab Tan δ
4. Cov txheej txheem xeem
4.1 Cov kauj ruam dav dav
1. Sau npe cov ntaub ntawv ntawm txhua lub bushing
2. Nco ntsoov lub Hoobkas ntsuas qhov tseem ceeb rau kev sib piv
3. Ntxuav bushings thiab kais sib txuas
4. Txheeb xyuas cov kais npog gasket
4.2 Kev Xeem Xeem
1. Ntsuas txhua lub bushing ib tus zuj zus
2. Rau txhua bushing:
- Ua C1 xeem (UST hom)
- Ua C2 xeem (GST hom)
- Sau qhov ntsuas qhov ntsuas hluav taws xob, tam sim no, thiab lub zog muaj zog
- Ntsuas cov nqi capacitance
- Siv peb qhov kev nyeem kom sib xws
4.3 Test Voltage Levels
-C1 xeem: 10kV
-C2 xeem: 10kV
- Khaws qhov hluav taws xob ruaj khov thaum kuaj
5. Kev lees txais
5.1 Tshiab Bushings (ntawm 20 degree)
- Lub zog Factor (Tan δ):
- C1 Tsawg dua lossis sib npaug rau 0.4%
- C2 Tsawg dua lossis sib npaug rau 0.7%
- Capacitance sib txawv los ntawm daim ntawv teev npe:
- C1: ±5%
- C2: ±10%
5.2 Kev pabcuam hnub nyoog Bushings (ntawm 20 degree)
- Lub zog Factor (Tan δ):
- C1 Tsawg dua lossis sib npaug rau 0.7%
- C2 Tsawg dua lossis sib npaug rau 1.0%
- Tshawb nrhiav yog tias:
- Hloov ntawm kev xeem dhau los > 0.3%
- Kev hloov pauv peev> 3%
6. Cov ntaub ntawv kaw tseg
6.1 Yuav tsum ntsuas
- Ntsuam xyuas qhov voltage thiab tam sim no
- Lub zog muaj zog (Tan δ)
- Capacitance qhov tseem ceeb (C1 thiab C2)
- Kub thaum kuaj
- Humidity thaum kuaj
- Lub sijhawm thiab hnub xeem
6.2 Cov ntaub ntawv
- Bushing serial tooj
- Cov ntaub ntawv ntsuas cov khoom siv
- Kuaj cov duab kos duab
- Tus neeg ua haujlwm thiab cov neeg ua pov thawj kos npe
7. Kev kho qhov kub thiab txias
1. Sau qhov ntsuas kub tiag tiag
2. Siv cov chaw tsim khoom kho qhov nkhaus
3. Siv cov qauv kho kom raug:
PF(20 degree)=PF(T) × K
qhov twg K yog qhov kho qhov kub thiab txias
Piv nrog rau cov txiaj ntsig qub thiab FAT cov ntawv ceeb toom.Tom qab qhov kev xeem tiav, cov bushings tau txuas nrog lub zog thiab hauv av. Cov kev nyeem ntawv tau txais los ntawm Tan Delta Tester yuav tsum muab piv rau cov qauv tsim nyog muab los ntawm cov chaw tsim khoom los txiav txim siab qhov rwb thaiv tsev zoo ntawm bushings. Yog tias qhov tseem ceeb nyob rau hauv qhov kev lees paub, cov bushings raug suav tias yog nyob rau hauv qhov zoo. Txawm li cas los xij, yog tias qhov tseem ceeb nyob sab nraum qhov kev lees paub, kev tshawb nrhiav ntxiv yuav tsum tau kuaj xyuas qhov teeb meem.