Radisys EPC-16数字量输入卡件

产品详细资料
限制性接地故障的745实现（如下所示）是一种低阻抗电流差动方案，其中通过类似于百分比差动的负载偏置来处理由于CT公差引起的“溢出”电流。745计算残余电流和接地电流的矢量差（即3I0-Ig），并将其除以大线路电流（Imax）以产生百分比斜率值。斜率设置允许用户根据所使用CT的类别和质量来确定元件的灵敏度。对于额定负载下的保护级CT，通常假设由于CT“溢出”导致的总体误差不超过4%。注：限制接地故障保护也适用于具有接地输入的三角形绕组，如表3.2所示。由于严重外部故障导致CT饱和而导致的误操作问题由可编程定时器处理。定时器为外部故障提供了必要的延迟，以便通过适当的外部保护来清除，并具有额外的好处，即如果RGF元件在定时器到期后仍被拾取，则745操作并清除故障。这种方法提供了备份保护。由于受限接地故障元件的目标是检测低幅值的内部绕组故障电流，因此内部故障的时间延迟无关紧要，因为灵敏度和安全性是关键参数。例如，考虑具有以下规格的变压器：对于离中性点5%距离处的绕组故障点：从图5-24：故障电流与离中性点之间的关系（第5-73页），我们可以看出，由于故障导致的I p增加可以忽略不计，因此3I o=0（近似）。因此，大相电流=I max=I额定值=525 A（大约）The 745 implementation of restricted ground fault (shown below) is a low impedance current differential scheme where “spill” current due to CT tolerances is handled via load bias similar to the percent differential. The 745 calculates the vectorial difference of the residual and ground currents (i.e. 3I 0 - I g) and divides this by the maximum line current (I max) to produce a percent slope value. The slope setting allows the user to determine the sensitivity of the element based on the class and quality of the CTs used. Typically no more than 4% overall error due to CT “spill” is assumed for protection class CTs at nominal load. Note The restricted ground fault protection is also available for delta windings with ground inputs as shown in table 3.2.The issue of maloperation due to heavy external faults resulting in CT saturation is handled by a programmable timer. The timer provides the necessary delay for the external fault to be cleared by the appropriate external protection with the added benefit that if the RGF element remains picked up after the timer expires, the 745 operates and clears the fault. This approach provides backup protection. Since the restricted ground fault element is targeted at detecting low magnitude internal winding fault currents, the time delay for internal faults is of little consequence, since sensitivity and security are the critical parameters. For example, consider a transformer with the following specifications:For a winding fault point at 5% distance from the neutral:rom FIGURE 5–24: Fault currents vs. points from neutral on page 5–73, we see that the I p increase due to the fault is negligible and therefore 3I o = 0 (approximately). Therefore, the maximum phase current = I max = I rated = 525 A (approximately)
主营产品简介
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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.

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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

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●除了产品特性以及功能，还需了解产品的使用寿命环境。

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

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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