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        • [field:alttext /]LHT8000抗干擾介質損耗測試儀
        • [field:alttext /]
        LHT8000抗干擾介質損耗測試儀
        在線咨詢客服 187 7100 2614
        詳細描述


        概   述Brief Introduction

            LHT8000型異頻介損自動測試儀是發電廠、變電站等現場或實驗室測試各種高壓電力設備介損正切值及電容量的高精度測試儀器。儀器為一體化結構,內置介損測試電橋,可變頻調壓電源,升壓變壓器和SF6 高穩定度標準電容器。測試高壓源由儀器內部的逆變器產生,經變壓器升壓后用于被試品測試。頻率可變為45Hz或55Hz,55Hz或65Hz,采用數字陷波技術,避開了工頻電場對測試的干擾,從根本上解決了強電場干擾下準確測量的難題。同時適用于全部停電后用發電機供電檢測的場合。該儀器配以絕緣油杯可測試絕緣油介質損耗。

            LHT8000 Non-power-frequency Dielectric Loss Tester is a high-precision instrument, which can be applied to automatically measure electrical loss tangent () and capacitance of all kinds of high voltage electrical equipments on the spot of power plants, substations,laboratory, etc. The instrument has an integrative structure with inner-placed dielectric loss bridge.Mains voltage, which is generated by frequency-shift power inside the instrument and is boosted by transformer, is applied to test equipments. The frequency of main power is 45Hz or 55Hz, 55Hz or 65Hz, adapted with digital technology, which avoids the disturbance of the electric field with industrial frequency to the specimen and had thoroughly resolved the problem how to measure correctly in the strong electric field. Meanwhile, it can be used on the occasion of generator supplying power after power down. Furthermore, it also can be applied to measure the dielectric loss of electric oil with insulating oil cap.

         

        儀器主要具有如下特點It characterized as the following:

        l 超大液晶中文顯示Super big LED Chinese display screen

            儀器配備了大屏幕(105mm×65mm)中文菜單界面,屏顯分為左右兩部分,左邊為功能菜單區,右邊為相關狀態信息提示,每一步都非常清楚,操作人員不需要專業培訓就能使用。一次操作,微機自動完成全過程的測量,是目前非常理想的介損測量設備。

             With big screen of Chinese menu, the LED display has been divided into left and right parts, the left side is functional menu, and the right side is the status information accordingly, which could be clearly operated step by step without official training. Furthermore, Microcomputer can accomplish the entire measuring process with being operated for once. So the bridge is a perfect instrument for measuring dielectric loss at present.

        l 海量存儲數據Tremendous Data Storage

        儀器內部配備有日歷芯片和大容量存儲器,能將檢測結果按時間順序保存,隨時可以查看歷史記錄,并可以打印輸出;

        Equipped with calendar CMOS chip and tremendous storage inside the instrument, so the test result can be kept chronologically for checking and printing out.

        l 科學先進的數據管理Scientific and advanced data management

        儀器數據可以通過U盤導出,可在任意一臺PC機上通過我公司專用軟件,查看和管理數據并可生成工作報告。

        The data could be outputted via U disk so as to be checked and managed and even reports generated at any computer with our software.

        l 多種測試模式Multi- model test

        儀器能夠分別使用內高壓、外高壓、內標準、外標準、正接法、反接法、自激法等多種方式測試;在外標準外高壓情況下可以做高電壓(大于10kV)介質損耗。

             Inner high-voltage, outer high-voltage, inner standard, outer stander, mode-positive, mode-reverse, self-excited test method could be applied; it also can be applied to measure the dielectric loss on condition of outer standard high-voltage.

        l CVT測試一步到位CVT one step test

        該儀器還可以測試全密封的CVT(電容式電壓互感器)C1、C2的介損和電容量,實現了C1、C2的同時測試。該儀器還可以測試CVT變比和電壓角差。

        The instrument can also test the whole sealed CVT (of a capacitor voltage transformer) C1,C2 of dielectric loss and its capacitance, to realize testing C1, C2 simutaneously.The instrument can also test the CVT ratio and voltage angle difference.

        l 高速采樣信號 High speed sampling signal

        儀器內部的逆變器和采樣電路全部由數字化控制,輸出電壓連續可調。

        The internal inverter and sampling circuit of the instrument are digital controlled, the output voltage is continuous and adjustable.

        l 多重保護安全可靠Multiple protection to guarantee safety

        儀器具備輸入電壓波動、輸出短路、過壓、過流、溫度等多重保護措施,保證了儀器安全、可靠。儀器還具備接地檢測功能,確保不接地設備不允許升壓。

        The equipment has the function of input voltage fluctuation, short circuit, overvoltage, overcurrent, temperature and other multiple protection measures to ensure its safety and reliability.It also has the function of grounding detection to ensure that the voltage not allowed to be increased without grounding device.

        工作原理Principle of Operation

        在交流電壓作用下,電介質要消耗部分電能,這部分電能將轉變為熱能產生損耗。這種能量損耗叫做電介質的損耗。當電介質上施加交流電壓時,電介質中的電壓和電流間成在相角差ψ,ψ的余角δ稱為介質損耗角,δ的正切tgδ稱為介質損耗角正切。tgδ值是用來衡量電介質損耗的參數。儀器測量線路包括一標準回路(Cn)和一被試回路(Cx),如圖2—1所示。標準回路由內置高穩定度標準電容器與測量線路組成,被試回路由被試品和測量線路組成。測量線路由取樣電阻與前置放大器和A/D轉換器組成。通過測量電路分別測得標準回路電流與被試回路電流幅值及其相位差,再由數字信號處理器運用數字化實時采集方法,通過矢量運算得出試品的電容值和介質損耗正切值。

           儀器內部已經采用了抗干擾措施,保證在外電場干擾下準確測量。

             Part of electric energy, which transforms to heat energy and then causes energy loss, was consumed by dielectric in the effect of AC voltage. The energy loss above-mentioned is called dielectric loss. When the AC voltage was loaded on the dielectric, phase difference, , between phases of voltage and current in the dialectic exists.  Here, complement of , , is called dielectric loss angle and tangent of , , is called dielectric-loss tangent, which is the parameter to evaluate the dielectric loss. The total circuit is composed of a standard loop- Cn and a test loop-Cx, where the standard loop is constituted of internal high-stability standard capacitances and measuring lines and the test loop is constituted of the sample and measuring lines. The measuring lines above-mentioned is composed of sampling resistance, prefix amplifier and A/D switcher. Magnitude of standard-loop current and that of test-loop current, and the phase difference between them can be measured with measuring line. By a digital signal processor, the observed data above are obtained with real-time digitally collecting and capacitance and are obtained with vector calculating.

        Notice: Anti-interference measures, which ensure measuring correctly even under the interference of external electric field, are taken inside the instrument

         

        圖 2—1  測量原理圖 Fig.1 Measuring Schematic Diagram

        主要技術參數Technical Parameter

         

        1

        使用條件Condition of Use

         

         

         of Use

        -15℃∽40℃

        RH<80%

        2

         

        抗干擾原理

        Principle of Anti-interference

        變頻法frequency conversion

        3

        電源Power Source

        AC 220V±10%

        允許發電機generator can be used

        4

        高壓輸出

        High Voltage Output

        0.5KV∽10KV

        每隔Each 0.1kV

        精 度Precision

        2%

        最大電流Maximum Current      

        200mA

        容量Capacity

        1500VA

        5

        自激電源Self-Excited Power

        AC 0V∽50V/15A

        45HZ/55HZ

        6

        分辨率Definition

        tgδ: 0.001%

        Cx: 0.01pF

        7

        精度Precision

        △tgδ:±(讀數Reading*1.0%+0.040%)

        △C x :±(讀數Reading*1.0%+1.00PF)

        8

        功耗分辨率Watt coss Definition

        Pr: 0.1mW

        9

        電流分辨率

        Electric current Definition

        Ix: 0.1mA

         

        10

        測量范圍Measuring Range

        tgδ

        無限制Without Limit

        C x

        15pF < Cx < 300nF

         

        10KV

        Cx < 60  nF

         

         5KV

        Cx < 150 nF

         

         1KV

        Cx < 300 nF

        CVT測試 CVT Test

        Cx < 300 nF

        11

        CVT變比范圍CVT Test

        10∽10000

        CVT變比精度CVT Precision ratio

        0.1%

        CVT變比分辨率

        CVT resolution ratio

        0.01°

        12

        外型尺寸Dimension

        430(L)×330(W)×330(H)

        13

        存儲器大小Storage Size

        80組支持U盤數據存儲

        80GroupSupport Disk U

        14

        重    量Weight

        28 Kg


        l 產品簡介

        滿足DLT962-2005《高壓介質損耗測試儀通用技術條件》的標準要求,是在我公司生產的變頻抗干擾介質損耗測試儀之后,成功研制的第五代新型的測量儀;隨著城鄉電網改造的不斷深入,更高電壓等級電站越來越多,倒相法、移相法,已不能完全滿足現場測試需求,該新型介質損耗測試儀,可在不改變測試電壓頻率的情況下,能得到50HZ條件下電容值cx及tgδ值,提高了測量可靠性和準確性,并可基本抑制電場干擾,滿足現場的使用要求。

        產品特性

        u 儀器采用復數電流法,測量電容、介質損耗及其它參數。測試結果精度高,便于實現自動化測量。

        u 儀器采用了變頻技術來消除現場50Hz工頻干擾,即使在強電磁干擾的環境下也能測得可靠的數據。

        u 儀器采用大屏幕液晶顯示器,測試過程通過漢字菜單提示既直觀又便于操作。

        u 儀器操作簡便,測量過程由微處理器控制,只要選擇好合適的測量方式,數據的測量就可在微處理器控制下自動完成。

        u 一體化機型,內附標準電容和高壓電源,便于現場測試,減少現場接線。

        u 儀器測量準確度高,可滿足油介損測量要求,因此只需配備標準油杯,和專用測試線即可實現油介損測量。

        u 設CVT測試功能,可實現CVT的自激法測試,無需外置附件,一次測量C1,C2的電容和介損全部測出。

        u 反接線測試采用ivddv技術,消除了以往反接線數據不穩定的現象。

        u 具有反接線低壓屏蔽功能,在220kVCVT 母線接地情況下,對C11 可進行不拆線10kV 反接線介損測量

        u 過流保護功能,在試品短路或擊穿時儀器不受損壞。

        u 接地保護功能,當儀器不接地線或接地不良時,儀器不進入正常程序,不輸出高壓。

        u 觸電保護功能,當儀器操作人員不小心觸電時候,儀器會立即切斷高壓,保障試驗人員的安全.

        l 技術參數

        u 準確度:Cx:±(讀數×1%+1pF)

        tgδ:±(讀數×1%+0.00040)

        u 抗干擾指標:變頻抗干擾,在200%干擾下仍能達到上述準確度

        u 電容量范圍:內施高壓: 3pF~60000pF/10kV 60pF~1μF/0.5kV

        外施高壓: 3pF~1.5μF/10kV 60pF~30μF/0.5kV

        分辨率:最高0.001pF,4位有效數字

        u tgδ范圍:不限,分辨率0.001%,電容、電感、電阻三種試品自動識別。

        u 試驗電流范圍:10μA~5A

        u 內施高壓:設定電壓范圍:0.5~10kV

        最大輸出電流:200mA

        升降壓方式: 連續平滑調節

        電壓精度: ±(1.5%×讀數+10V)

        電壓分辨率: 1V

        試驗頻率: 45、50、55、60、65Hz單頻

        45/55Hz、55/65Hz、47.5/52.5Hz自動雙變頻

        頻率精度: ±0.01Hz

        u 外施高壓:正接線時最大試驗電流1A,工頻或變頻40-70Hz

        反接線時最大試驗電流10kV/1A,工頻或變頻40-70Hz

        u CVT自激法低壓輸出:輸出電壓3~50V,輸出電流3~30A

        u 測量時間:約40s,與測量方式有關

        u 輸入電源: 180V~270VAC,50Hz/60Hz±1%,市電或發電機供電

        u 計算機接口:標準RS232接口

        u 打印機:煒煌A7熱敏微型打印機

        u 環境溫度: -10℃~50℃

        u 相對濕度:<90%


        ?

        武漢市瀾海豚電力科技有限公司 版權所有

        ICP備案編號:鄂ICP備19009915

        鄂公網安備 42011202001988號

        網站備案號:鄂ICP備19009915號-1

        地址:湖北省武漢市東西湖區五環大道31號

        電話:027-83084700  027-83399796 手機:18771002614

        電子郵箱:hbwhlht@163.com

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