When the transformer operates in the power system, it is difficult to avoid some short-circuit events. Depending on the severity of the short-circuit event and the strength of the transformer's anti short-circuit ability, sometimes it is safe and sometimes it is damaged. The damage of a distribution transformer will affect a factory in a short time, while the short-circuit accident of a distribution transformer will affect an urban area, and the replacement is more difficult, and the repair takes 2 3 months. Therefore, improving the short-circuit resistance of power transformer has always been a matter of great concern to the power department, and it is also the main goal of the manufacturing department.
Before the 1990s, there were only four high current laboratories (stations) in Xi'an, Shenyang, Shanghai and Beijing in China. Their facilities are mainly for switching capacity test in the switching industry, but they can also test distribution transformers. Therefore, in the early and mid-1980s, Shenyang
Transformer Research Institute yog lub luag haujlwm rau kev sib koom ua ke ntawm sl7 thiab qub s9-30 1600KVA / 10kV tis transformers. Cov qauv kev sim ua los ntawm txhua lub Hoobkas tau ua luv luv- kev ntsuas hluav taws xob hauv cov chaw soj ntsuam saum toj no (chaw nres tsheb). 14 sl7 thiab 12 qub S9 dhau qhov kev xeem. Tom qab ua tiav ntawm qhov kev xeem, S9 hom tshiab tau sim ua. Thawj batch ntawm 37 units tau dhau qhov kev xeem, thiab qhov tsim nyog tus nqi ntawm cov tshiab S9 hom tau mus txog ntau tshaj 90 feem pua (Kema nyob rau hauv lub Netherlands tau sim txawv teb chaws transformers, nrog rau ib lub sij hawm tsim nyog tus nqi ntawm 50 feem pua). Los ntawm xyoo 1996, txog 300 qhov hloov pauv hloov pauv tau raug sim hauv ntau lub chaw soj nstuam (chaw nres tsheb), suav nrog S7 hom.
For more than ten years, China has done a lot of short-circuit tests on distribution transformers, and improved each damage condition, so that the qualified rate reaches more than 90 percent , much higher than the foreign qualified rate of 50 percent , which has been confirmed in the actual operation of power grid and achieved gratifying results. It can be said that the basic solution to the short-circuit strength of distribution transformer depends on "practical test", which is a very important experience.
Tsis muaj lub hauv paus rau kev sim fais fab transformers hauv Suav teb, yog li luv luv - Circuit Court tsis kam ntawm lub zog transformers yog qhov nyuaj los daws. Xyoo 1986, Lub Xeev Pawg Neeg Saib Xyuas Kev Npaj tau pom zoo rau kev tsim kho ntawm Shenyang Hushitai qhov chaw ntsuas siab tam sim no, uas tau qiv los ntawm lub xeev thiab tau pom zoo los sab laj los ntawm EDF tuam txhab ntawm Fabkis. Tom qab ntau xyoo ntawm kev ua haujlwm, thawj theem ntawm qhov project tau ua tiav thaum kawg ntawm xyoo 1993, 220kV network tau tsim thiab ob lub 1200mva / 0 224kv tau teeb tsa. Tom qab tau txais los ntawm pawg kws tshaj lij hauv lub xeev, nws tau muab tso rau hauv kev ua haujlwm thaum Lub Ib Hlis 1994 thiab ntau qhov kev faib hluav taws xob hloov pauv tau ua nyob rau xyoo 1994 thiab 1995, Tom qab tau txais kev paub dhau los, luv luv - ntsuas hluav taws xob ntawm 110kV fais fab transformer yog tau ua nyob rau hauv 1996.
Kev ntsuas luv luv ntawm 110kV fais fab tuag transformer
110kV power transformer is the main transformer in China's transmission and distribution system, and its output accounts for about 1 / 5 of the total output of transformer. According to the statistical data from 1995 to 1996, the short-circuit accident of 110kV transformer accounts for 5O percent of the total accident of this level, and shows an upward trend. Therefore, how to improve the short-circuit resistance of this level of power transformer has become the main topic at the Zengcheng conference in Guangdong. It is recognized that the best way is to verify it with short-circuit test.
From 1996 to the first half of 2005, due to the attention of power departments and manufacturing enterprises, More than 60 factories have successively conducted short-circuit tests on 80 110kV power transformers (including 4 from Shenyang Transformer Co., Ltd., 3 from Xinjiang TBEA Co., Ltd., 2 from Nantong AIA Transformer Co., Ltd., 2 from Changzhou transformer factory, 3 from Yunnan Transformer Factory, 2 from Baoding, 3 from Huapeng, etc.) with a pass rate of >96 feem pua. Distribution transformers nrog kev tsim nyog tus nqi siab dua 10kV.
Yuav kom dhau qhov kev xeem thawj zaug, cov chaw tsim khoom no tau nqis peev ntau ntawm tib neeg thiab cov khoom siv. Nyob rau hauv cov txheej txheem ntawm kev tsim khoom, lawv tau ua qee yam kev siv zog hauv kev tsim, txheej txheem, kev tsim khoom thiab kev tswj hwm, uas yog undoubtedly ib qho kev txhim kho zoo rau cov kev lag luam zoo. 28 ntawm 45 cov khoom tau sim nyob rau hauv thawj ib nrab ntawm 2001 tau khiav ntawm daim phiaj hluav taws xob, thiab ib qho uas muaj lub sij hawm luv tshaj plaws tau khiav ntau lub hlis. Ntawm lawv, cov khoom tshiab ntawm Shenyang substation, 50000kVA / 110kV transformer, tau ua haujlwm rau ntau tshaj tsib xyoos thiab tau txais tos los ntawm cov neeg siv khoom. Raws li kev tau txais cov ntaub ntawv xeem, cov chaw tsim khoom no tau txhim kho cov khoom tsim qauv. Ua qhov no raws li tus qauv, lawv tau muab tso rau hauv kev tsim khoom loj thiab muab tso rau hauv daim phiaj hluav taws xob, yog li tsis muaj luv luv - kev sib tsoo hauv Circuit Court yav tom ntej.
Cov ntaub ntawv txheeb cais ntawm Wuhan High Voltage Research Institute of State Power Corporation thiab Tuam Tshoj Hluav Taws Xob Tshawb Fawb Lub Tsev Haujlwm los ntawm 1995 txog 1999 qhia tias luv luv -kev sib tsoo ntawm lub tshuab hluav taws xob tau txo qis los ntawm 50 feem pua yav dhau los mus rau 40 feem pua, uas yog Feem ntau yog vim muaj kev txhim kho ntawm kev ua haujlwm kev ntseeg siab vim yog kev ua haujlwm ntawm cov khoom siv saum toj no ntawm cov khoom siv hluav taws xob zoo heev. Nws yuav tsum tau hais tias luv luv -circuit kev huam yuaj ntawm 110V transformer tau pib curbed.
Qhov luv luv -kev ntsuas hluav taws xob ntawm 110kV transformer yuav tsum tau nthuav dav ntxiv
Tam sim no, muaj 60 lub Hoobkas uas ib txwm muab 110V fais fab hloov pauv hauv Suav teb, thiab tsuas yog ntau tshaj 100 lub Hoobkas tau ua 110kV transformer luv luv - Circuit Court test, suav txog li 55 feem pua. Ob peb lub chaw tsim khoom tab tom npaj cov xwm txheej rau luv luv- kev ntsuas hluav taws xob, uas yuav tsum muaj kev txhawb nqa zoo los ntawm cov neeg siv khoom thiab nquag siv cov khoom kuaj los ua lub luag haujlwm hauv lub cev. Hais txog kev tsim cov chaw tsim khoom, peb yuav tsum ua haujlwm raws li kev tsim thiab thev naus laus zis, npaj cov khoom siv txaus, nrhiav nyiaj txiag thiab muab tso rau hauv kev xyaum. Nws tseem yuav tsum tau taw qhia tias cov chaw tsim khoom uas tsis tau ua lub tshuab hluav taws xob luv luv - qhov ntsuas hluav taws xob yuav tsum tuav lub sijhawm, kom tsis txhob cuam tshuam rau kev txiav txim thiab txawm tias poob qhov tsim nyog ntawm kev tsim khoom.