1X00797H01L艾默生
廈門莫格電氣自動(dòng)化有限公司是一家專業(yè)提供工業(yè)自動(dòng)化領(lǐng)域的備件服務(wù)商,產(chǎn)品品種齊全、價(jià)格合理,公司實(shí)力雄厚,重信用、守合同、保證產(chǎn)品質(zhì)量,以多品種經(jīng)營特色和薄利多銷的原則,贏得了廣大客戶的信任。
我們主營PLC可編程控制器模塊,DCS卡件,ESD系統(tǒng)卡件,振動(dòng)監(jiān)測系統(tǒng)卡件,汽輪機(jī)控制系統(tǒng)模塊,燃?xì)獍l(fā)電機(jī)備件等,公司致力于為工業(yè)用戶提供自動(dòng)化解決方案,打造工控備件一站式供應(yīng)平臺(tái)。
我們與世界的多家PLC,DCS產(chǎn)品維護(hù)服務(wù)供應(yīng)商建立了緊密的合作關(guān)系。能直接從境外進(jìn)貨、能夠提供不同國別、廠商的設(shè)備以及備件、包括一些停產(chǎn)的老系統(tǒng)備件,解決您多處尋找的麻煩或?qū)Ξa(chǎn)品質(zhì)量問題的擔(dān)心等,在價(jià)格上我們有很大的優(yōu)勢(shì)、產(chǎn)品詳細(xì)信息、竭誠歡迎您來電查詢或使用 查詢!
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1 箱式開關(guān)站簡介
10kV無人值班箱式開關(guān)站(有些廠家又稱箱式變電站)是指將包括開關(guān)設(shè)備、站用變壓器等在內(nèi)的高壓一次系統(tǒng)和包括直流電源、控制、保護(hù)、計(jì)量、遠(yuǎn)動(dòng)等在內(nèi)的二次系統(tǒng)以及相應(yīng)的內(nèi)部連接線均用外殼封閉起來,預(yù)裝到一個(gè)防潮、防塵、防火、隔熱的鋼結(jié)構(gòu)箱殼內(nèi),從而組成一種全封閉、可移動(dòng)的箱型成套開關(guān)設(shè)備。作為一種適應(yīng)兩網(wǎng)改造推出的新產(chǎn)品,它符合農(nóng)網(wǎng)變電所"小容量、密布點(diǎn)、短半徑"的建設(shè)原則和"戶外化、小型化、造價(jià)低、安全可*、技術(shù)*"的發(fā)展方向,因而深受各部分青睞,近年來在農(nóng)網(wǎng)改造中獲得了廣泛的應(yīng)用。
縣級(jí)供電企業(yè)農(nóng)網(wǎng)改造用于高壓工程的投資十分緊缺,為在不減小工程規(guī)模的條件下,加快工程進(jìn)度、降低工程本錢選用箱式開關(guān)站就是一個(gè)很好的辦法。目前我局已投運(yùn)的箱式開關(guān)站10個(gè),它們進(jìn)步了農(nóng)網(wǎng)的綜合自動(dòng)化水平,為逐步實(shí)現(xiàn)變電所的無人值班打下了基礎(chǔ)。但是,在應(yīng)用過程中也發(fā)現(xiàn)了一些題目,現(xiàn)在結(jié)合這些工程中出現(xiàn)的題目,談一點(diǎn)設(shè)計(jì)體會(huì)。
2 部分箱式開關(guān)站存在的缺陷
截止2001年底,我局已有10個(gè)35kV變電所的箱式開關(guān)站投運(yùn)。
以上箱式開關(guān)站中,幾乎每一個(gè)開關(guān)站都是由不同的廠家生產(chǎn)的。各個(gè)開關(guān)站名稱、規(guī)格、型號(hào)不盡相同,如有些廠家稱之為"智能型箱式開關(guān)站";也有一些廠家稱之為"預(yù)裝式高壓成套開關(guān)柜";還有一些廠家稱之為"箱式變電站"或簡稱"箱變"。由于各個(gè)供貨廠家的技術(shù)水平和生產(chǎn)能力參差不齊,所提供的設(shè)備質(zhì)量差異也較大。部分產(chǎn)品存在或多或少的缺陷,有些小廠家甚至在中標(biāo)后不能生產(chǎn)出符合要求的設(shè)備,zui后轉(zhuǎn)包給其他廠家生產(chǎn)。綜合起來,筆者發(fā)現(xiàn)如下題目:
2.1 環(huán)境測控系統(tǒng)不完善
箱式開關(guān)站本身的結(jié)構(gòu)決定了箱體內(nèi)電氣設(shè)備透風(fēng)散熱條件差的缺點(diǎn)。為了改善箱內(nèi)設(shè)備的運(yùn)行條件,適應(yīng)一年四季的工作環(huán)境,必須給開關(guān)站配置包括加熱器、凝露控制器、往濕調(diào)溫功能空調(diào)機(jī)等在內(nèi)的完善的環(huán)境測控系統(tǒng),使無人值班的開關(guān)站能自動(dòng)調(diào)節(jié)環(huán)境條件,將箱內(nèi)溫度控制在合乎要求的范圍之內(nèi);同時(shí),當(dāng)環(huán)境參數(shù)越*,相關(guān)設(shè)備能自動(dòng)啟動(dòng),可以將信號(hào)上傳到調(diào)度,調(diào)度職員能隨時(shí)把握開關(guān)站的運(yùn)行狀態(tài)。這些環(huán)境測控裝置對(duì)于開關(guān)站的安全穩(wěn)定運(yùn)行具有重要的作用,然而部分供貨廠家對(duì)此卻不重視。有的箱式開關(guān)站,由于內(nèi)部沒有設(shè)置空調(diào),僅在頂板上安裝了幾臺(tái)排風(fēng)扇用以透風(fēng)散熱,安裝完工后,夏天開關(guān)站在太陽暴曬下,箱體內(nèi)溫度遠(yuǎn)遠(yuǎn)高于正常情況下的溫度,這給箱體內(nèi)設(shè)備帶來了惡劣的運(yùn)行環(huán)境,不僅會(huì)縮短設(shè)備的使用壽命,降低其可*性,而且還給運(yùn)行維護(hù)帶來了麻煩:巡視檢驗(yàn)職員進(jìn)進(jìn)開關(guān)站如同進(jìn)進(jìn)蒸籠。此外,由于忽略了凝露控制器,外界溫度急劇變化時(shí)在箱體內(nèi)產(chǎn)生凝露,對(duì)設(shè)備也會(huì)造成不良影響。這些題目在相關(guān)部分的協(xié)調(diào)下得到了解決,但也影響了工程的施工進(jìn)度。
2.2 電容間隔存在安全隱患
選用10kV箱式開關(guān)站的35kV變電所盡大多數(shù)位于農(nóng)村電網(wǎng)的末端,為了進(jìn)步功率因素,降低電網(wǎng)損耗,一般都要求開關(guān)站配置Y形接線的密集型并聯(lián)電容器作為無功補(bǔ)償裝置。目前多數(shù)廠家配置的是密集式電容器;其抗擊穿性強(qiáng);但是采用的仍然是液體浸漬劑作為盡緣油,事故率較高,有發(fā)生電容器爆炸的危險(xiǎn),與開關(guān)站內(nèi)其他設(shè)備全部無油化不配套。另外,還有少數(shù)廠家以電壓互感器代替放電線圈供電容器斷電時(shí)放電之用,不能迅速、有效地將電容器上的剩余電壓降至安全值,不符合規(guī)程的要求,這些都成為開關(guān)站的安全隱患。為了*這些"安全殺手",建議選用新型干式無功補(bǔ)償電容,配置電容放電線圈,單獨(dú)放置在開關(guān)站內(nèi)一個(gè)具有防爆功能的加強(qiáng)型間隔內(nèi)。
2.3 箱體外殼不盡人意
一般來講,箱式開關(guān)站外殼防護(hù)等級(jí)不得低于IP2X,除了達(dá)到電氣五防要求外,還應(yīng)該具備防雨、防潮、防銹、防火、隔熱的功能。為了達(dá)到這些目的,開關(guān)站的外觀將頂板設(shè)計(jì)成為"人"字狀,采用整體式金屬框架結(jié)構(gòu),外露支柱部分及底座部分采用防銹工藝處理,外涂防腐性能良好的裝飾性面漆;內(nèi)部為金屬板件結(jié)構(gòu),并為各個(gè)主要元件焊接有可*的接地裝置;箱體設(shè)置采用新型復(fù)合材料有隔熱功能的夾層。部分廠家只留意箱內(nèi)電氣設(shè)備,而對(duì)箱體外殼沒有給予應(yīng)有的重視,雨天沒有相應(yīng)的排水措施,結(jié)果頂部經(jīng)常積水,不能排盡。后在箱體壁板上安裝了從頂部平臺(tái)引下來的排水管,才解決了這一題目。
3 箱式開關(guān)站的設(shè)計(jì)原則及留意事項(xiàng)
為了盡量將產(chǎn)品缺陷消滅在出廠之前,讓產(chǎn)品符合要求,使用部分應(yīng)與廠家通力合作,將當(dāng)?shù)毓╇娤到y(tǒng)的具體資料提供給廠家,以便廠家在生產(chǎn)時(shí)加以綜合考慮。
在我局選用箱式開關(guān)站的均為各縣(市)級(jí)供電企業(yè)的35kV變電所,各個(gè)變電所的總體規(guī)模大同小異,基本情況如下:35kV部分為單母線接線,一般終期規(guī)模有2回35kV進(jìn)出線。變壓器為"一控一"運(yùn)行方式,均采用35kV真空或SF6斷路器控制。變壓器終期規(guī)模2臺(tái),單臺(tái)容量都在5000kVA以下。10kV部分均采用單母線接線,一般饋線4~5回,電容器1組,電壓互感器1組??紤]到上述實(shí)際情況,結(jié)合對(duì)具體工程所總結(jié)的經(jīng)驗(yàn),筆者以為,設(shè)計(jì)10kV箱式開關(guān)站時(shí)應(yīng)該把握好以下幾個(gè)方面:
3.1 10kV部分可不設(shè)站變
考慮到35kV變電所規(guī)劃,*將實(shí)現(xiàn)雙回路"手拉手"環(huán)網(wǎng)供電的模式,安裝在35kV電源進(jìn)線或35kV母線上的直配變已經(jīng)能夠滿足站內(nèi)用電可*性及容量的需要。因此,箱式開關(guān)站內(nèi)10kV部分可不設(shè)站用變,這樣不但可以節(jié)約資金,還可以減少開關(guān)站的占地面積和體積,使其結(jié)構(gòu)更加緊湊。
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NEW YARWAY INSTRUMENT 8110 3-WAY VALVE MANIFOLD 1500/5000 PSI 250/850°F (YY2)
SIEMENS 599-06050 Flange Valve 2 1/2" model # 010106 (F6)
LOT OF 2 NEW IN BOX COLONIAL FULL BLOCK BALL VALVE V08102N 3/4" GRAY PVC (215-1)
NEW IN BOX ASCO RED HAT SOLENOID VALVE 8600A014 1/2 750 PSI (170-1)
NEW IN BOX SMC AIR VALVE VPA4250 PRESS MAN 0.2-0.9MPa(2~9.?2KGF/CM2) (108)
NEW IN BOX ASCO RED HAT 8600A014 1/2 T144308 (187-1)
NEW ALCO SOLENOID VALVE 222CB 1B1B INLET/OUTLET 1" FRP STRAIGHT THRU (122)
NEW MAX-AIR SOLENOID VALVE SV61-24V DC 2-8 BAR 30-120 PSI (M3-1)
PARKER VALVE 73312BN4UNJONOC?111P3 110/50 120/60 10 W 70-1240 KPA 10-180PSI (D4)
NEW IN BOX ROSS VALVE H21VXBH023C (D2)
NEW IN PKG PARKER FC702-6 BRASS 90 DEGREE FLOW CONTROL VALVE 3/8 CON (133-10)
NIB GS DEZURIK B16.34 COMPAK ACTUATOR & 3-WAY 1/2" PERMASEAL VALVE 9390613 (T3)
NEW IN BOX ASCO RED HAT VALVE HBX8263G210L T04672 A45380 3/8 120/60 (207-1))
NEW PARKER PS411117ACP SUB BASE H2 1/2 NPT SB SD 6" LDS VALVE KIT (Q5)
NEW, UE H400-453 400 Series Pressure Switch 0 -20 psi (WL19-1)
ASCO RedHat 1/4" 3 way Solenoid Valve EF8320G174MS (BIN13)
NIB E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV175 (280-3)
NEW PARKER GOLD RING SOLENOID VALVE 08F2502132ACF (187-2)
NEW IN BOX PARKER UNIT VALVE 16F24O2164ACF 1 NPT A 5/125 W 5/125 O15/125 (231-1)
NEW IN BOX LEGEND VALVE S-655 PVC BALL CHECK VALVE 3/4" (133-3)
NIB ASCO RED-HAT 3/4 SOLENOID 2 WAY VALVE 8041C3 (PP4)
NEW, "Apollo" 1" Ball Valve 83-405-01A 1500PSI WOG-150 PSI STEAM (K5-1)
NEW IN BOX DELTROL FLUID CONTROL VALVE 10000-78 N20B (223-2)
SPORLAN MA2493 SOLENOID VALVE WATTS 18 NEW (TT2-1)
PARKER CHECK VALVE NEW NIB 4F-C04L-1-V-SS CO4L 1”? 27PH (I5-1)
NEW SS 2 WAY NC PILOT OPERATED SOLENOID VALVE W/ COIL D264DBUN +7400 (187-2)
NEW ITT K3E59A2 SOLENOID VALVE 2" NPT 5 PSI 110/120V 50/60HZ .56A 28W (M2)
NEW NO BOX ASCO RED HAT SOLENOID VALVE SK-1955-48 AIR/WATER/OIL 120V 60HZ (H1)
NEW JACKES-EVANS GEN PURP SOLENOID VALVE RB3P3 1/4"3/8” (HH2-2)
NEW A LOT OF 2 E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV158 (BIN63)
NEW A LOT OF 3 E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV194 (BIN63)
NEW A LOT OF 3 E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV231 (BIN64)
NEW A LOT OF 4 E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV237 (BIN64)
NEW A LOT OF 3 E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV290 (BIN64)
NEW, NELES-JAMESBURY 1/2" Ball Valve 9NB 2236 MT MTFE 316SS 250 WSP-PSIG (BIN35)
NEW IN BOX GOYEN SOLENOID VALVE 1B6M3-AUBNA-628?1 0-125 PSI 110/120V (PP1-1)
NIB* PARKER H1165BKA23001B 120VAC/60HZ 145 PSI PNEUMATIC HYDRAULIC VALVE (T7)
NEW IN BOX ASCO RED HAT VALVE 8262C1 2NC 1/8 120/60 21702 (193-1)
NEW IN BOX PARKER UNIT VALVE 16F24O2164ACF 1" A5/125 W 5/125 L5/125 (187-2)
NIB* ASCO RED-HAT JKP8262G230 110/120V 50/60HZ 1/4" 2-WAY SOLENOID VALVE (X1)
NEW A LOT OF 4 E-TRON COMPONENTS PCV VALVE TUNE-UP PART FV112 V112 (BIN63)
NEW IN BOX ALCO FOUR WAY REVERSING VALVE 401RD 4-57 VLC (201)
NEW ROCKWOOD SAFETY RELIEF VALVE 1/2 X 3/4 RXSO 68E BD3 (116-2)
NEW SMC AS4000 IN LINE AIR FLOW MANUAL CONTROL VALVE (298-2)
NEW SMC SY5120-3DZ-01 BASE MOUNTED BODY 1/8" PORT SOLENOID VALVE (W1)
NEW IN BOX ASCO RED HAT VALVE 831655 3/8 NPT 120V 125 PSI (199-2)
Used, Magnatrol Valve 33A53 Type "A" Full Port Solenoid Valve NC 3/4" (O4)