VALMET 421907-1B

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描述

VALMET 421907-1B
? 若不止一臺變壓器時,運行方式往往只允許1-2臺接地運行,設(shè)計采用中性點零序電流繼電器與經(jīng)相鄰變壓器中性點零序電流繼電器控制的零序電壓繼電器配合使用的變壓器保護(hù)方案,保護(hù)回路設(shè)計先跳中性點不接地變壓器,然后中性點跳直接接地的變壓器,以防止不接地系統(tǒng)故障點的間歇性弧光過電壓危及電氣設(shè)備的安全。為避免全廠所有變壓器全部被切的嚴(yán)重后果,保護(hù)時間應(yīng)逐級配合,先斷開母聯(lián)或分?jǐn)嗦菲?,再?jīng)零序電壓元件跳開中心點不接地主變,最后經(jīng)零序電流元件跳開中性點接地主變。對中性點有可能直接接地運行,也有可能不接地運行的主變,因失去接地中性點引起的電壓升高,應(yīng)裝設(shè)相應(yīng)的保護(hù)裝置。在直接接地時用零序電流保護(hù)。在中性點不接地時用零序電壓保護(hù)或裝設(shè)放電間隙保護(hù),放到間隙保護(hù)起到過電壓保護(hù)的作用,當(dāng)放電間隙被擊穿形成零序電流通路時,利用接在放電間隙回路的零序電流保護(hù),切除該變壓器。變壓器采用放電間隙保護(hù),放電間隙裝于變壓器中性點與地線之間、有棒形、球形、角形等多種形式,實際安裝中可以棒形用得最多,零序電壓保護(hù)動作電壓按發(fā)生單相接地故障時保護(hù)安裝處可能出現(xiàn)最大零序電壓整定。?對變壓器高壓側(cè)中性點直接接地的自耦變壓器和三繞組變壓器采用零序過電流保護(hù),取自變壓器中性點的零序CT安裝無方向零序保護(hù),在主變兩側(cè)分別裝上零序保護(hù),了為滿足選擇性可增設(shè)零序方向元件。方向元件用各斷路器側(cè)CT的自產(chǎn)零序電流。主變中性點零序電流互感器的極性接線可以將中性點零序電流保護(hù)指向本側(cè)母線或主變側(cè)。采用斷路器處的零序電流保護(hù),和一般高中壓側(cè)方向指向各自的母線,但當(dāng)中壓側(cè)不無源時,高壓側(cè)零序方向可指向主變。指向母線保護(hù)的范圍以為斷路器電流互感器安裝處開始,需要與線路零序保護(hù)配合。指向主變變壓器,需要主變壓器另一側(cè)出線的接地保護(hù)相配合。采用主變中性點處地零序電流保護(hù),則保護(hù)范圍比斷路器處零序電流保護(hù)比要寬一些。小浪底目前運行的主變中性點零序電流保護(hù)無方向,這樣的整定配合比較清晰方便,一是限制跳開母聯(lián)斷路器,二是限制跳開本側(cè)開關(guān)。

產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA
? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家

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Receptacle 4234BC Russellstoll 30A 480VAC Haz.Duty NOS

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ABB Robotics Cable Assy. 3E 032185 Vert. Arm Extend 2@

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GE Protective Capacitor 9L18BBB301 0-650VAC 3po thyrite

GE Protective Capacitor 9L15BCC003 0-650VAC 3po Thyrite

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Honeywell Protectorelay Control RA890G1288 Rebuilt CAPP

Kollmorgen Goldline XT MT322A1-R2D1 Servomotor400/4?80V

Joslyn Clark Motor Relay 5DP7-7030-11 75A 500VDC New

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Honeywell ST3000 Smart Transmitter w/manual NOS New

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AEG Schneider TSX Qantum 140DRA84000 Relay Out 16×1 NOS

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2801-YFX A Machine Vision Camera Body AB Recon.

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Endress Hauser Fluitector DTI 120 24V-240VAC 24VDC NEW

II-VI Laser Lens 1 3/8″ 3 1/2″ Brass Casing New NOS

Schaffner Power Supply FS4874-100-35 480VAC 100A New

Tosvert-130G2+ Transistor Inverter VFD .75hp AC NOS New

ASCO Under Voltage Monitor 3ph 214A293 120/208V NOS New

Killark KPJ-604 Receptacle + Base 115/230/460V 3ph 60A

DS1516FRAB Russellstoll Receptacle 100A 3ph 120/208Vac

Sprecher + Schuh Industrial Motor Control Starter New

Honeywell ST3000 Smart Transmitter NOS

SafeTnet Gas Monitor Type 100 Thermo GasTech

Appleton belt Alignment Switch AFA-20 SPDT 20A 120 480V

2608D25G01 Current Sensor MTR-1015-13 1200:.1 New

2608D25G02 Current Sensor MTR-1015-02 1600:.1 New

Reliance DutyMaster Motor P56H5040R-JF 1/3hp 208/230V

ABB Robotics Elmo Servo Motor PS130/6-50-P Sweden

CH Cutler Hammer KD Support Block 1482D11G04 3pole New

Phoenix Contact InterbBus-S IBSIPCDI3/24-F-?V3 24VDC Hub

Sine Filter BlockUSA SFB400/4 3ph LC 0-440/0-520V New

Namco EA180 31302 M Snap Lock Control Limit Switch,NIB

Compumotor Dynaserv SR5070B62 DD Servo Actuator 230VAC

96MPR03M Furnas 96M CPU Module Ser A NOS

3134-72 Russellstoll Receptacle 100A 480VAC 250VAC/DC

Scientific Columbus XL3-1K5-A2 CL31K5A2 transducer NEW

TSVG812A Micro Versa Trip GE Neutral Current Sensor NOS

96MRK04 Furnas 96M Modular 4 slot rack ( 45C-911 ) NOS

ABB Robotics Flexible Resistor w/fan 3HAB2844-1/2 New

Mitsubishi Melsec programmable controller AI61 NOS New

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GE EPM5300P Multifunction Power Monitor PL53002A0B* New

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140R-302 Current Transformer 3000:5 Square D 600V NOS

6ES7153-2AA02-0?XB0 Siemens Simatic S7 Module 24VDC

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Siemens Simatic TI315 DA CPU In:24VDC 315 Series

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Telemecanique VC5GU Main Switch in IP55 Enclosure 100A

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Watlow Panel Process Display 945A-2DA2-A000 Series 945

Red Lion Intelligent Meter IMD23107 IMD2 Series NOS

Sy/Max 8030 CRM21 Interface Module 30608-504-50

PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學(xué)習(xí)編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運算、實數(shù)運算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個物理回路驗證,比如變頻器+電機+測速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。