Kev Tiv Thaiv Cov Khoom Siv Hluav Taws Xob rau Roj-Immersed Fais Fab Transformers

1. Chromatographic Analysis ntawm Dissolved Gases nyob rau hauv Transformer Roj

Kev ceev faj yuav tsum tau them yog tias ib qho ntawm cov pa hauv qab no ntau tshaj:

Tag nrho cov hydrocarbons (CH₄, C₂H₆, C₂H₄, C₂H₂): 150 μL / L

Acetylene (C₂H₂): 5 μL / L (1 μL / L rau 500 kV transformers)

Hydrogen (H₂): 150 μL / L

Yog hais tias qhov kev nce hauv cov roj concentration tau pom, cov roj tsim cov nqi yuav tsum tau txiav txim siab. Yog tias tsim nyog, lub sijhawm xeem yuav tsum luv rau kev taug qab.A transformer yog suav tias yog txawv txav yog:

Tag nrho cov hydrocarbon tsim tus nqi siab tshaj 0.25 mL / h (qhib hom) lossis 0.5 mL / h (hom kaw), lossis

Tus txheeb ze tiam tus nqi tshaj 10% ib hlis.

 

2. Transformer Oil Tests

Xws li lub zog dielectric, tanδ, thiab ntsuas qhov ntsuas qhov ntsuas.

Dielectric lub zog kuaj ntsuas cov roj muaj peev xwm tiv taus qhov hluav taws xob tawg.

tanδ yog qhov ntsuas tseem ceeb ntawm cov roj zoo.

Volume resistivity qhia txog theem ntawm impurities thiab noo noo nyob rau hauv cov roj.

 

3. DC Resistance Ntsuas ntawm Windings thiab Bushings

Rau transformers siab tshaj 1600 kVA:

Qhov sib txawv ntawm theem Tsawg dua lossis sib npaug li 2% ntawm qhov nruab nrab;

Qhov sib txawv ntawm cov kab (tsis muaj nruab nrab) Tsawg dua lossis sib npaug li 1% ntawm qhov nruab nrab.

Rau transformers 1600 kVA thiab hauv qab no:

Qhov sib txawv ntawm theem Tsawg dua lossis sib npaug li 4% ntawm qhov nruab nrab;

Qhov sib txawv ntawm cov kab (tsis muaj nruab nrab) Tsawg dua lossis sib npaug li 2% ntawm qhov nruab nrab.

Hloov ntawm cov ntaub ntawv keeb kwm (kho rau tib qhov kub thiab txias) yuav tsum tsis pub tshaj 2%.

 

4. Insulation Resistance, Absorption Ratio, thiab Polarization Index

Ntsuas rwb thaiv tsev tiv thaiv ntawm txhua qhov cua thiab hauv av, thiab nruab nrab ntawm windings.

Cia cov roj teeb tsa ua ntej ntsuas: 6 h rau cov hloov pauv me me, 24 teev rau cov chav loj.

Siv 2500V lossis 5000V megohmmeter. Tshem tawm ntau dua lossis sib npaug li 5 min (loj) lossis Ntau dua lossis sib npaug li 2 min (me) tom qab ntsuas.

Rwb thaiv tsev tiv thaiv yuav tsum tsis txhob txo qis dua 30% piv nrog cov txiaj ntsig yav dhau los.

Absorption ratio ≥1.3 or polarization index ≥1.5 (waived if insulation resistance >10000 MΩ).

 

5. tanδ Kev ntsuas ntawm Windings thiab Bushings

Siv QS1 Schering choj lossis M-hom dielectric tester.

Short-circuit qhov kuaj winding thiab av lwm windings.

Kev txwv ntawm 20 degree:

Tsawg dua lossis sib npaug li 1.5% rau Tsawg dua lossis sib npaug li 35 kV

Tsawg dua lossis sib npaug li 0.8% rau 66-220 kV

Tsawg dua lossis sib npaug li 0.6% rau 330-500 kV

Kev hloov ntawm cov ntaub ntawv keeb kwm yuav tsum tsis pub tshaj 30%.

 

6. Kev ntsuas tam sim no

High DC voltage yog siv los ntsuas qhov ntsuas cua sov.

Siv cov polarity tsis zoo, nyeem tam sim no tom qab 1 min.

Test voltages:

6-10 kV: 10 kV

20-35 kV: 20 kV

66-330 kV: 40 kV

500 kV: 60 kV Ib nrab voltage rau un- oiled transformers.

Tam sim no yuav tsum tsis pub tshaj 150% ntawm qhov tseem ceeb ntawm keeb kwm (tsis piv yog tias<10 μA).

 

7. Qhov ntsuas hluav taws xob ntsuas ntawm txhua qhov kais dej

Kev sib piv yuav tsum sib npaug ntawm daim ntawv teev npe.

Tolerances:

± 1% rau<35 kV and ratio <3

± 0.5% rau cov kais dej ntawm lwm cov transformers

Lwm cov kais dej: hauv 1/10 ntawm impedance voltage (%), max ± 1%

Cov hau kev: ob-voltmeter txoj kev (tseem siv), tig tus choj piv txoj kev (nyiam dua).

 

8. On-Load Tap Changer Tests

Tshawb xyuas cov haujlwm ua ntu zus thiab lub kaum sab xis.

Tshawb xyuas kev ua haujlwm ib txwm muaj thiab muaj peev xwm thauj khoom.

Cov kev ntsuam xyuas muaj xws li kev hloov pauv hloov, hloov lub sij hawm, kev sib cuag, cov resistors uas tsis yog-linear, thiab tawm qhov khoob.

Txheeb xyuas cov contactors, lub cev muaj zog, lub zog, cov chaw pabcuam, cov ntsuas, thiab cov txee.

Rwb thaiv tsev roj tawg voltage Ntau dua lossis sib npaug li 25 kV.

Secondary Circuit Court rwb thaiv tsev tsis kam Ntau tshaj los yog sib npaug rau 1 MΩ (2500 V).

 

9. Pawg Vector (Peb-theem) lossis Polarity (Ib theem ib zaug) Tshawb xyuas

Vector pab pawg yuav tsum phim lub npe phaj rau kev ua haujlwm sib luag.

Txoj kev: DC txoj kev, ob-voltmeter txoj kev, theem meter txoj kev, lem ratio choj txoj kev.

Ib-theem transformers muaj kev rho tawm lossis ntxiv polarity.

Txoj kev ntsuas polarity: DC thiab AC.

 

10. Tsis-Load Tam sim no thiab Poob ntsuas

Ib-theem: I₀(%)=I₀ / I_N × 100%

Ib-theem poob: p₀=p₀' × KTA × KTV

Peb theem: I₀(%)=(I₀A + I₀B + I₀C) / (3I_N) × 100%

Peb-theem poob: p₀=p₀1 + p₀2

 

11. Short-Circuit Voltage thiab Poob Measurement

Ib-theem: U_K(%)=U_K / U_N × 100%

Ib-theem poob: P_K=P_K' × KTA × KTV

Peb theem: U_K(%)=U_K / U_N × 100%

Peb theem poob: P_K=P₁ + P₂

 

12. Winding Deformation Test

Yuav tsum muaj ntau dua los yog sib npaug rau 110 kV transformers tom qab winding hloov los yog nyob ze luv luv Circuit Court.

Khaws qhov chaw kais dej thiab qhov ntev ntawm cov hlau lead zoo ib yam thaum lub sijhawm kuaj.

Siv qhov kev sib txuas ruaj khov.

Sib piv nrog cov thawj lossis siv cov lus teb zaus curves.

Nws tuaj yeem ua ke nrog lwm txoj hauv kev xws li nqa lub tank, ib-theem impedance, thiab xau inductance.

 

13. Fais Fab Zaus Nrog Kev Ntsuas Hluav Taws Xob

Ntsuas cov rwb thaiv tsev tseem ceeb thiab pom cov dej noo, tawg, thiab xoob.

Short-circuit qhov kev sim winding thiab av lwm tus.

Siv voltage rau 60s:

6 kv:21v

10 kV: 30 kV

35kv:72 qw

Tsis txhob cuam tshuam qhov voltage thaum lub sijhawm kuaj.

 

14. Kev Ntsuas Kev Tso Tawm Ib Feem

Kev tso tawm ib nrab ua kom lub rwb thaiv tsev laus thiab tsis tuaj yeem kuaj pom los ntawm cov qauv ntsuas ntsuas.

Khaws cov qauv kom huv si thiab qhuav.

txwv:

Tsawg dua lossis sib npaug li 500 pC ntawm 1.5 Um / √3

Tsawg dua lossis sib npaug li 300 pC ntawm 1.3 Um / √3