馬頭發(fā)電總廠7主變壓器（以下簡稱主變）參數(shù)如下：型號為SFP8*240000/220，阻抗電壓13.7%空載電流0. 62%空載損耗252.7kW短路損耗646.7kW油質(zhì)量33.8t，冷卻方式為強迫油循環(huán)式。1982年8月保定變壓器廠生產(chǎn)，1983年投運。
~1985年發(fā)電機先后2次發(fā)生端部短路事故，主變都受到低壓側(cè)出口短路沖擊。該變壓器1983~1985年油色譜分析正常，從1985年開始，發(fā)現(xiàn)主變總烴升高，且C2H2含量升高，究其原因顯然與主變承受短路電流沖擊有關(guān)。為消除總烴超標故障，1986 ~1994年曾經(jīng)4次吊罩檢查，1994年在現(xiàn)場對該變壓器的上軛鐵進行了重新疊鐵。修后1994 ~1999年底運行比較穩(wěn)定，總烴含量一直在注意值（150ML/L）以內(nèi)，從2000年1月開始變壓器總烴逐步升高，6個月總烴上升到702.9ML/L，色譜分析數(shù)據(jù)見表1，1999 ~2001年負荷變化情況見表2. 1故障原因分析由表1、表2發(fā)現(xiàn)，隨著負荷的增長，變壓器總烴異常升高。按照三比值法（022）判斷變壓器內(nèi)部存在局部700 *C的高溫部位。從2000* 06―18脫氣開始，2001*01*29計算絕對產(chǎn)氣速率為53. 66mL/d，從2000年1月至6月，主變總烴升高與其所帶負荷的增加密不可分。發(fā)電機無功負荷增大，定子電流升高，發(fā)電機出口電壓升高。由變壓器原理可知，變壓器結(jié)構(gòu)確定后，鐵芯的磁通正比于端電勢（即近似電壓）由于電壓的升高造成總烴上升，根據(jù)變壓器的結(jié)構(gòu)設(shè)計資料，結(jié)合歷次檢修資料、歷年的油色譜分析報告及1994年處理上軛鐵的狀況，認為變壓器總烴升高的根本原因是變壓器鐵芯存在故表1色譜分析數(shù)據(jù)取樣油中所含氣體/WL/L三比值時間總烴編碼脫氣表2發(fā)電機負荷統(tǒng)計時間有功功率/MW無功功率/定子電流/kA時間有功功率/無功功率/定子電流/腿一10腿一11腿一12障點。變壓器無功負荷增大、磁通升高是引發(fā)鐵芯故障、造成總烴升高的直接原因。
2修復(fù)的必要性如果保持現(xiàn)狀，定期進行脫氣處理，不能消除設(shè)備存在的故障，給安全生產(chǎn)留下嚴重隱患。
鑒于機組通流改造及發(fā)電機增容方案已經(jīng)確定，發(fā)電機有功功率由200MW增容到220MW，發(fā)電機定子額定電流由8625A增加到9額定容量為240MV*A，實際利用轉(zhuǎn)移容量為213MV*A.發(fā)電機增容后視在功率為258.壓工作廠變消耗8%變壓器實際轉(zhuǎn)移容量238.1MV*A.隨著發(fā)電機增容改造，變壓器負荷電流的增大，如果不徹底處理主變鐵芯故障而維持現(xiàn)狀，很可能由于主變總烴含量過高而限制發(fā)電機的出力。
根據(jù)主變存在的鐵芯故障狀況，過去曾經(jīng)過4次吊罩處理，沒有從根本上消除故障點，本次大修如仍然就地解體根據(jù)歷次檢修經(jīng)驗很難保證徹底消除鐵芯故障點。因此，經(jīng)河北省電力公司組織專家3檢查結(jié)果修復(fù)方案3.1解體檢查情況經(jīng)解體檢查，變壓器三相線圈絕緣狀況良好，分接開關(guān)沒有燒痕和過熱跡象。拆下鐵芯上軛鐵后發(fā)現(xiàn)B相鐵芯立柱的低壓側(cè)有5~6片鐵芯過熱的痕跡，面積最大的約有200mmX130mm，有的芯片上的漆膜已脫落。另外，從拆下的軛鐵芯片和鐵芯立柱上明顯可見，鐵芯的穿心螺桿處孔洞大多已成喇叭口狀。
3.2修復(fù)方案3.2.1利用原鐵芯修復(fù)將變壓器芯片壓平、脫油、干燥、重新涂漆，再進行疊鐵。主變原硅鋼片型號為ZP脫落，片間絕緣電阻變小，引起渦流增大，鐵芯局部過熱故障將再次出現(xiàn)。
3.2.2更換故障鐵芯35硅鋼片市場上找不到，如果使用現(xiàn)在的硅鋼片，厚度為0. 3mm，相差比較大。2種硅鋼片混用，在45*接縫處薄厚不一，漏磁增大，也可能造成局部發(fā)熱，所以此方案不可行。
3全部更換鐵芯按新型變壓器技術(shù)參數(shù)設(shè)計，采用0.的硅鋼片，將原上下軛鐵穿釘螺絲結(jié)構(gòu)改為新型綁扎結(jié)構(gòu)，從根本上解決了穿釘螺絲孔周圍鐵芯過熱的問題。
4技術(shù)經(jīng)濟比較4.1技術(shù)分析使用原硅鋼片存在以下隱患：由于上軛鐵穿心螺桿處的鐵芯已成喇叭口狀，喇叭口高度大部分已達5 ~6mm，且喇叭口處芯片厚度已經(jīng)變薄，即使采用滾壓工藝，也難以將變形部分壓平，在疊鐵時就有可能損傷其他芯片的漆膜，由此可能在運行中造成鐵芯局部過熱，很難完成增容后機組發(fā)電量的傳輸，無疑將造成巨大的經(jīng)濟損失。
有資料記載變壓器返廠大修時，也曾采用原鐵芯片重新涂漆工藝，但組裝后鐵芯空載損耗驟增，最后不得不被迫更換鐵芯。若該主變采用此工藝，也存在這種風險，一旦這種現(xiàn)象重演，肯定會延誤較長時間，不能按預(yù)定工期完成變壓器檢修任務(wù)，影響發(fā)電機組的投運，造成的經(jīng)濟損失不可估量。
因此，從安全運行角度和檢修工藝的可靠性方面綜合考慮，更換鐵芯方案應(yīng)為首選方案。
4.2經(jīng)濟效益比較新鐵芯采用日本進口的硅鋼片，厚度為0.3mm，技術(shù)指標明顯優(yōu)于原0.35mm厚的芯片。新鐵芯采用全斜接捆綁式結(jié)構(gòu)，與原來穿心式結(jié)構(gòu)相比，鐵耗明顯降低。新鐵芯損耗的設(shè)計值為164kW，而舊鐵芯的銘牌損耗值為252. 7kW，而鐵芯經(jīng)涂漆處理再疊鐵后，損耗值要增加6%~8%，按7%計算，使用舊鐵芯其損耗值將達到270.4kW. 500h、平均上網(wǎng)電價0. 3196元/（kW*h）計算采用新鐵芯后，年減少的空載損耗折合人民幣：（270.4*164）X5500X0.3196=18.7（萬元）此電價按全公司平均售電價，因為空載損耗為無成本電價。（下轉(zhuǎn)第54頁）色印刷，雙月25日出版是由河北省電力公司主管河北省電機工程學會、河北省電力研究院合辦的河北省唯一的電力科技刊物是河北省優(yōu)秀科技期刊并入編中國學術(shù)期刊（光盤版）主要刊登發(fā)電、輸配電（包括農(nóng)電）用電、電力建設(shè)、科研設(shè)計、技術(shù)改造等方面的論文與經(jīng)驗成果，主要欄目有：科技論文、經(jīng)驗介紹、計算機應(yīng)用、討論與建議、設(shè)計與施工、事故分析、科技管理、產(chǎn)品信息等。
來稿要求：1稿件內(nèi)容力求理論聯(lián)系實際，重點突出層次分明，數(shù)據(jù)可靠文句通順簡練數(shù)學推導(dǎo)簡明扼要，避免冗長的公式推導(dǎo)，每篇文章一般不超過5000字。
2來稿請?zhí)峁╇娮影娓寮瑫r附打印稿H份每頁字數(shù)不超過400字，留出行距與字距3文章題名應(yīng)力求簡潔（不宜超過20字）確切地展現(xiàn)文章的中心內(nèi)容和重要論點并附英文標題超過3000字的稿件應(yīng)附有150~300字的與3~8個。
4文章署名不宜超過3人。
5文章層次用阿拉伯數(shù)字分級編號層次標題應(yīng)簡短明確，題末不用標點符號。層次劃分不宜超過4節(jié)，每兩層次編號數(shù)字之間加右下角圓黑點末數(shù)字后不加點。如：第1層次用1、2、…，第2層次用1.1、1.2、…，依此類推層次的編號均應(yīng)左頂格寫后空一格寫標題另起一行縮進兩格寫內(nèi)文。分行并列敘述的用小寫英文字母a、b.、c、……順序表示此編號均應(yīng)左起空兩格書寫在編號的圓點后空一字母字距再寫具體內(nèi)容。
6外文字母的正斜體、大小寫必須寫清楚；上下角碼的相應(yīng)位置及各種符號必須區(qū)別明顯形狀相似而容易混淆的外文需在打印稿上注明文種與大小寫。
7計量單位一律采用國家法定計量單位及符號，技術(shù)術(shù)語要用國內(nèi)通用名稱8表格與插圖應(yīng)科學、簡潔、自明。表格使用三線表表序與表題應(yīng)寫在表格上方表內(nèi)數(shù)字的單位和百分號等歸并在欄目中，如果表格內(nèi)全部欄目中的單位均相同則可把單位標示在表格頂線上方的右端。表內(nèi)空白代表未測或無此項，“一”代表無*0*代表實測結(jié)果為零。
9公式的順序號用阿拉伯數(shù)字排在行末頂格。公式的說明接寫說明文字。說明文字與量綱之間用逗號隔開。
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** ABB SACE Tmax T7 S 1000 MAIN 1000 AMP 3 POLE PR231/P Breaker/ Disconnector **
ABB PS 130/6-50-T-LSS-4371 API ELMO Servomotor
ABB PS 130/6-50-T-LSS-4370 API ELMO Servomotor
LOT OF 23 ABB STAB MODULE ZLS183BB *NEW*
ABB 419M6573 CIRCUIT SHIELD *USED*
ABB 426E1170 RELAY *USED*
ABB 425D1071 CIRCUIT SHIELD *USED*
ABB 468S1375 CIRCUIT SHIELD *USED*
ABB 410D4470 CIRCUIT SHIELD *USED*
ABB 202D6141-UL CIRCUIT SHIELD *USED*
ABB 410D4477 CIRCUIT SHIELD *USED*
ABB 412A1175 VOLTAGE BALANCE RELAY *NEW IN A BOX*
ABB 424K1105 CIRCUIT SHIELD *USED*
ABB 443S2144 CIRCUIT SHIELD *USED*
ABB 439S0045 CIRCUIT SHIELD *USED*
ABB 6632003A1 6632002D1 PC ANALOG CONTROL 12 SLOT CARD MODULE RACK B345253
ABB ACS-BRK-C BRAKE MODULE 2KW 200-850VDC **XLNT**
ABB DSQC 236 YB56010B-CB/11 Robotics Drive Control Board (60 Day Warranty)
ABB DSQC 266G 3HAB 8801-1/2B New Product
ABB DSQC 266C 3HAB 8798-1/2B
ABB Bailey IMDSM04 Digital Input Slave Module
ABB 1 FT3074-5AZ21-9-Z N 1FT30745AZ219ZN MOTOR
ABB CI626A-1 FIELDBUS ADMINISTRATOR CONTROLLER PCB CIRCUIT BOARD B417464
New ACS150-03E-07A3-4 ABB 3 Phase Inverter 380-480V 3000W 3KW 90 days warranty
USED ABB YTE 102A Servo Drive Unit YT213001-AA/3 5月10日
USED ABB DSQC 249B Servo Amplifier 3HAA3563-AHA/2
USED ABB YTE 102B Servo Drive Unit YT213001-AB/6 5月18日早上
ABB ROBOTICS PS 60/4 90 P LSS 4307 SERVO MOTOR WITH BRAKE INDUSTRIAL ELECTRONICS
ABB ROBOTICS PS 60/4 90 P L SS 4667 R SERVO MOTOR WITH BRAKE INDUSTRIAL SWEDEN
ABB Commander 200 Process Controller, C201A30301U
LAUER: PCS812 S7-MPI MODUL PX 812 101.6BM
1PCS ABB MODULE PP18017HS GOOD CONDITION
ABB ROBITICS ELMO PS130/6-200-P-LSS-4101 3HAC2148-1 Servo Motor
ABB IPFAN14 MPS II SYMPHONY 120/240V-AC 7 IN COOLING FAN B440035
ABB DSQC266T 3HAB8802-1/2B ROBOT SERVO 3HAB880212B REMAN
ABB 0-460VAC 5A AC DRIVE G00500A00
ABB 10DS3111EDE15P1B2DA11321 4" MAGNETIC FLOW METER TUBE HASTELLOY 285PSI 25425
ABB EHW 160C-AF1L WELDING ISOLATION CONTACTOR, 3 POLE SIZE W4, NNB
ABB AC Drive ACS401601632 20HP *Broken Cover*
ABB CHART RECORDER COMMANDER 1900 TYPE 1911JA001100000STD
ABB ACS501 AC Drive ACS501-010-4-00P2 10HP Used
ABB Combination starter Type 1 Enclosure 480V 10Hp - new 60 day warranty
ABB 3HAB-2214-8/4 I/O BOARD 5601-03 3HAB221484
NEW ORIGINAL 1PCS ABB MODULE 5STP27L1800
NEW ABB EH145C-1 Contactor 3 Pole 110/120V Coil
ABB Rectifier Board 3HAB2215-1 DSQC314A
ABB FLOWMETER FCM 2000 TRANSMITTER D674A868U05 USED
ALLEN BRADLEY MOTOR 1326AB-B420H-21 A326ABB420H21
ABB C485G50-U CAPACITOR *NEW OUT OF BOX*
ABB Advanced Recloser Power Control Device RER620
ABB DSQC 252 Safety Board 3HAA3563
ABB DSQC 314A Rectifier DC-Link 3HAB2215-1
ABB 60155749-002 PC BOARD 60155750-001 *USED*
ABB 10DX3111EDE07P1A2FAA1132 FLOW TUBE *USED*
ABB 61580-002 PC BOARD *USED*
ABB NBUB-61 REV. C *USED*
ABB Size W6 Welding Coantctor 600 Amp 120 VAC Coil
ABB TZIDC V18345-2027120001 Electro-Pneumatic valve ber New
ASEA BROWN BOVERI YB 161 101-CB DSQU 128 Robotic Controller Card holder w/ Cards
ABB 498A020G01 FT Switch Flextest New
NEW - ABB CONTROL SACE ISOMAX S3N15TW CIRCUIT BREAKER
ABB EH450 MAGNETIC 480V-AC 400HP 525A AMP AC CONTACTOR B453541
ABB 3HAB8802-1/2 DSQC266T
ABB Circuit Breaker 400amp SACES5 AC00263104
ABB Sace PR211 600A BKR
ABB PLC PM564-R-AC 2 month warranty
ABB AC Drive ACH401601632 20HP *Missing Keypad* Used
264C899A07 ABB Type CO-7 HILO Overcurrent Relay NIB
ABB SDCS-IOB-3 3BSE004086R1 CONTROL CONNECTION REV G PCB CIRCUIT BOARD B453500
ABB 3BSE004086R1 SDCS-IOB-3 CONNECTION REV H PCB CIRCUIT BOARD B453508
ABB 57160001-ADF PC BOARD DSDP 170 57160001ADF
ABB SDCS-IOB-3 3BSE004086R1 CONTROL CONNECTION REV H PCB CIRCUIT BOARD B454266
ABB 3BSC980006R89 MEMORY BOARD DSQC-317
ABB DSQC 325 3HAB2241-1 BOARD
ABB ACS - 500 AC DRIVE # ASC501-010-4-00P5 5月18日下午
NEW 1PCS ABB MODULE PP30012HS6A
ABB 3BSE008544R1 AI820 ANALOG 10V-DC INPUT MODULE B454670
New ABB Circuit Breaker 150 Amp Sace S3 240 480 600 volt
ABB ASEA BROWN BOVERI LS600 600 AMP CIRCUIT BREAKER
ABB Drive ACS501-002-4-00P2 Series B ACS501002400P2 _ SNAT7640
ABB ES34100 Circuit Breaker
ABB CONTROL BOARD DS0C331-3HAB7215-1/04 1821
ABB CONTROL BOARD DS0C331-3HAB7215-1/06-2808 6月16日下午到這
ABB CONTROL BOARD DS0C331-3HAB7215-1/06-2808
ABB CONTROL BOARD DS0C331-3HAB7215/2-1/03 824
ABB CONTROL BOARD DS0C331-3HAB7218-1/04 162
ABB 3HAB6107-1 Robot Cable
ABB 57310256-ER/1 BACK PLANE BOARD DSBB-175-B 57310256ER1
ABB K Line Arc Chute for K-1600/2000 Air Circuit Breaker (706775T12) New in box
USED ABB 48199880 Relay Communication Board V509 481997-001A L
ABB CONTACTOR AF260-20 AF26020 AF260 20 20VDC - 60VDC COIL 600V
ABB circuit breaker Tmax T5N 400, 300A, E93565, 3 Pole, IEC60947-2, #123A2
ABB Breaker Disconnect Switch S6H-D SACE S6 600A 600V 3P Used
ABB AF460W-30 Welding Isolation Contactor
