VARIAN 110531004备件工控模块

产品详情资料

本附录说明了如何使用两个CT来感测三相电流。显示了使用两个CT而不是三个CT来检测相电流的正确配置。两个CT中的每一个都充当电流源。从A相CT流出的电流流入标记为A的继电器上的插入式CT。从那里，电流与从C相CT流出、刚刚通过标记为C的继电器上插入式CT的电流相加。该“相加”电流流过标记为B的插入式电流，电流分裂以返回到其各自的源（CT）。极性非常重要，因为相位B的值必须是A+C的负等效值，以便所有矢量的和等于零。注意，如图所示，只有一个接地连接。如果进行了两个接地连接，则已创建电流的并行路径。在双CT配置中，电流将在两个CT的公共点矢量相加。该图说明了两种可能的配置。如果在已知平衡的系统上，一个相位读数高达1.73倍，只需反转两个相位CT之一处的导线极性（注意CT在某一点仍接地）。极性很重要。This appendix illustrates how two CTs may be used to sense three phase currents. The proper configuration for the use of two CTs rather than three to detect phase current is shown. Each of the two CTs acts as a current source. The current that comes out of the CT on phase A flows into the interposing CT on the relay marked A. From there, the current sums with the current that is flowing from the CT on phase C which has just passed through the interposing CT on the relay marked C. This ‘summed’ current flows through the interposing CT marked B and from there, the current splits up to return to its respective source (CT). Polarity is very important since the value of phase B must be the negative equivalent of A + C in order for the sum of all the vectors to equate to zero. Note that there is only one ground connection as shown. If two ground connections are made, a parallel path for current has been created. In the two CT configuration, the currents will sum vectorially at the common point of the two CTs. The diagram illustrates the two possible configurations. If one phase is reading high by a factor of 1.73 on a system that is known to be balanced, simply reverse the polarity of the leads at one of the two phase CTs (taking care that the CTs are still tied to ground at some point). Polarity is important.

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主营产品简介
专注于DCS、PLC、机器人控制系统、大型伺服四大系统领域。

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●使用前:

在操作和维护，安装设备之前，请阅读并严格遵守安全相关的信息。

Read and strictly follow safety-related information before operatingmaintainingand installing equipment.

●使用者要求:

必须从事安装，组装或维护设备等相关工控电气机械以及其他相关技术的人员。

Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.应用范围:

应用于品牌本系列工业以及生产生活自动化设备产品。

Used in the brand of this series of industriaand production automation eauipment products

适用于场景:系统集成，非标定制，产线升级改造，原设备电气替换等等。

Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.

●操作人员:

应该由本品牌专业培训操作员来安装、操作和维修设备。专业人员具有技术能力强，熟悉安全信息和安全实施:

熟悉设备的安装加工、操作和维护:熟悉处理所有的潜在危险情况。

Equipment should be installed,operated and maintained by trained operators from the brand

●危险情况

警告

.请注意使用人员的人身安全。

●除了产品特性以及功能，还需了解产品的使用寿命环境。

●充分学习产品使用手册，否则非专业人员可能会造成人身危险。

Study the product instruction manual thoroughlyotherwise it may cause personal danger to non-professionals.

●服务行业

适用水泥，木业，石业，橡胶，石油，化工，发电，环保，水处理，制冷，交通，钢铁，食品，饮料，船舶，制冷等行业

Applicable to cementwood,stone,rubber,petroleumchemical, power generation,