變壓器（Transformer）是一種利用電磁感應原理來改變交流電壓的設備，主要部件是初級線圈，次級線圈和鐵芯（磁芯）。 主要功能有：電壓變換，電流變換，阻抗變換，隔離，穩壓（磁飽和變壓器）等。它可分為電力變壓器和特殊變壓器（電爐變壓器，整流變壓器，工頻試驗變壓器，電壓）調壓器，採礦變壓器，音頻變壓器，中頻變壓器，高頻變壓器，衝擊變壓器，儀表變壓器，電子變壓器），電抗器，變壓器等）。 電路符號通常使用T作為數字的開頭。 示例：T01，T201等
輸出電抗器：當從逆變器到電動機的電纜輸出長度大於產品的規定值時，應增加一個輸出電抗器，以補償電氣時耦合電容的充電和放電的影響電纜正在運行，以避免逆變器流動。 輸出dv / dt電抗器：為了限制逆變器輸出電壓的上升速度，以確保電機絕緣正常。 正弦波濾波器：使逆變器的輸出電壓和電流接近正弦波，降低電機的諧波域係數和電機的絕緣壓力。 這些選件應安裝在變頻器的輸出側。
以下是產品型號及其介紹：
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4NC5112-0BC20；4NC5112-0CB21；4NC5112-2BC20；4NC5112-2CB21；4NC5113-0BC20；4NC5113-0CB21；4NC5113-2BC20；4NC5113-2CB21；4NC5115-0CC21；4NC5115-2CC21；4NC5117-0CC21；4NC5117-0DA21；4NC5117-2CC21；4NC5117-2DA21；4NC5121-0CC21；4NC5121-0DC21；4NC5121-2CC21；4NC5121-2DC21；4NC5121-2FA21；4NC5122-0CE21；4NC5122-0DE21；4NC5122-2CE21；4NC5122-2DE21；4NC5122-2FC21；4NC5123-0CE20；4NC5123-0CE21；4NC5123-0DE21；4NC5123-2CE20；4NC5123-2CE21；4NC5123-2DE21；4NC5123-2FC21；4NC5124-2FE21；4NC5125-2FE21；4NC5126-2FE21；4NC5222-0CE21；4NC5222-0DE21；4NC5222-2CE21；4NC5222-2DE21；4NC5223-0CE21；4NC5223-0DE21；4NC5223-2CE21；4NC5223-2DE21；4NC5224-0CE20；4NC5224-0CE21；4NC5224-0DE21；4NC5224-2CE20；4NC5224-2CE21；4NC5224-2DE21；4NC5225-0CE21；4NC5225-0DE21；4NC5225-2CE21；4NC5225-2DE21；4NC5227-2FE21；4NC5228-2FE21；4NC5231-2FE21；4NC5232-2FE21；4NC5325-0CE20；4NC5325-0CE21；4NC5325-0DE21；4NC5325-2CE20；4NC5325-2CE21；4NC5325-2DE21；4NC5326-0CE21；4NC5326-0DE21；4NC5326-2CE21；4NC5326-2DE21；4NC5327-0CE21；4NC5327-0DE21；4NC5327-2CE21；4NC5327-2DE21；4NC5328-2CE20；4NC5330-0CE21；4NC5330-0DE21；4NC5330-2CE21；4NC5330-2DE21；4NC5331-2DE21；4NC5431-0CH20；4NC5431-0CH21；4NC5431-0DH21；4NC5431-2CH21；4NC5431-2DH21；4NC5432-0CH21；4NC5432-0DH21；4NC5432-2CH21；4NC5432-2DH21；4NC5433-0CH20；4NC5433-0DH21；4NC5433-2CH20；4NC5433-2DH21；4NC5434-0CH21；4NC5434-2CH20；4NC5434-2CH21；4NC5435-0CH21；4NC5435-0DH21；4NC5435-2CH21；4NC5435-2DH21；4NC5436-2DK21；4NC5438-0CJ21；4NC5438-2CJ21；4NC5438-2DL21；4NC5440-0CJ21；4NC5440-2CJ21；4NC5440-2DM21；4NC5441-2CN21；4NC5441-2DN21；4NC5923-5LT21；4NC5925-5LT21；4NC5930-5LT21；4NC5940-5LT21；
7KT1223；7KT1222；7KT1260；7KT1542；7KT1548；7KT9030；7KT1546；7KT1545；7KT1543；7KT1540；7KT1242；7KT1238；7KT1900；7KT1664；7KT1666；7KT1533；7KT1668；7KT1236；7KT1662；7KT1682；7KT1531；7KT1673；7KT1233；7KT1671；7KT1665；7KT1907；7KT1667；7KT1530；7KT1908；7KT1661；7KT1663；7KT1681；7KT1672；7KT1670；7KT1652；7KT1654；7KT1656；7KT1110；7KT1120；7KT1200；7KT1651；7KT1653；7KT1655；7KT1202；7KT1201；7KT5600；7KT5823；7KT5833；7KT5822；7KT5821；7KT5801；7KT1255；7KT5500；7KT1254；7KT9010；7KT9011；7KT5812；7KT5814；7KT5811；7KT5601；7KT5602；7KT5603；7KT5604；7KT5802；7KT5803；7KT5804；7KT5806；7KT5807；7KT5505；7KT5501；7KT5502；7KT5503；7KT5504；7KT9000；7KT9021；7KT9020；
工作準則：
變壓器由鐵芯（或磁芯）和線圈組成。 線圈具有兩個或多個繞組。 連接到電源的繞組稱為初級線圈，其餘的繞組稱為次級線圈。 它可以轉換交流電壓，電流和阻抗。 最簡單的鐵芯變壓器由軟磁材料製成的鐵芯和覆蓋鐵芯的兩個匝數不同的線圈組成。
鐵芯的作用是加强两個線圈之間的磁耦合。 為了減少鐵中的渦流和磁滯損耗，鐵芯由疊層矽鋼板製成。 兩個線圈之間沒有電連接，並且線圈由絕緣的銅線（或鋁線）製成。 連接到交流電源的一個線圈稱為初級線圈（或初級線圈），連接到電器的另一個線圈稱為次級線圈（或次級線圈）。 實際的變壓器非常複雜，不可避免地存在銅損（線圈電阻發熱），鐵損（鐵芯發熱）和漏磁（被空氣封閉的感應線）等。為了簡化討論，僅這裡介紹理想的變壓器。 建立理想變壓器的條件是：忽略漏磁通，忽略初級和次級線圈的電阻，忽略鐵芯的損耗，並忽略空載電流（次級線圈初級線圈中的電流）線圈斷開）。 例如，當電力變壓器滿負荷運行時（次級線圈輸出額定功率），它接近理想變壓器。
變壓器是使用電磁感應原理製造的靜電電器。 當變壓器的原始線圈連接到交流電源時，鐵芯中會產生交變磁通，通常用φ表示。 初級線圈和次級線圈中的φ相同，並且φ也是簡單的諧波函數。 表格為φ=φmsinωt。 根據法拉第電磁感應定律，初級線圈和次級線圈中的感應電動勢分別為e1 =-N1dφ/ dt和e2 =-N2dφ/ dt。 在公式中，N1和N2是初級線圈和次級線圈的匝數。 可以看出，U1 ＝ -e1並且U2 ＝ e2（原始線圈的物理量由下標1表示，並且次級線圈的物理量由下標2表示）。 = N1 / N2，稱為變壓器的變壓比。 根據上式，U1 / U2 = -N1 / N2 = -k，即變壓器初級和次級線圈電壓的有效值之比等於其匝數比和初級與次級線圈之間的相位差電壓為π。
進一步得出結論：
U1 / U2 = N1 / N2
在可以忽略空載電流的情況下，存在I1 / I2 = -N2 / N1，即，初級和次級線圈電流的有效值與匝數成反比，並且相位差為π。
依次可用
I1 / I2 = N2 / N1
理想變壓器的初級和次級線圈的功率等於P1 = P2。 它表明理想的變壓器本身沒有功率損耗。 實際的變壓器總是有損耗，其效率為η= P2 / P1。 電力變壓器的效率非常高，高達90％以上
特性參數：
工作頻率
變壓器鐵芯損耗與頻率有很大關係，因此應根據使用頻率進行設計和使用。 該頻率稱為工作頻率。
額定功率
在規定的頻率和電壓下，變壓器可以長時間工作，而不會超過規定溫升的輸出功率。
額定電壓
指允許在變壓器線圈上施加的電壓，在操作過程中該電壓不得大於規定值。
電壓比
指變壓器一次電壓與二次電壓之比，空載電壓比與負載電壓比之間存在差異。
空載電流
當變壓器的次級線圈斷開時，初級線圈仍具有一定的電流。 電流的這一部分稱為空載電流。 空載電流由勵磁電流（產生磁通量）和鐵損電流（由鐵心損耗引起）組成。 對於50Hz的電源變壓器，空載電流基本上等於勵磁電流。
負載損失
指變壓器次級斷開時在初級測得的功率損耗。 主要損耗是鐵心損耗，其次是空載電流損耗（銅損耗）對初級線圈的銅電阻的影響，這部分損耗很小。
效用
指的是次級功率P2與初級功率P1之比的百分比。 通常，變壓器的額定功率越大，效率越高。
絕緣電阻
它表示變壓器每個線圈之間以及每個線圈與鐵芯之間的絕緣性能。 絕緣電阻的水平與所用絕緣材料的性能，溫度水平和濕度有關。
