简介

其他

简介

Closed Transition Transfer Switch (CTTS)

CTTS(闭路过渡式)转换开关

In a typical emergency system, there is an inherent momentary interruption of power to the load when it is transferred from one available

source to another. In most cases this outage is inconsequential, particularly if it is less than 1/6 of a second.

在一个典型的应急系统中，一个正常运行的电路通常会发生内部暂时的电源中断。绝大多数情况这种暂时的中断无足轻重，特别是当时间小于六分之一

秒时。

There are some loads, however, that are affected by even the slightest loss of power. There are also operational conditions where it may be

desirable to transfer loads with zero interruption of power when conditions permit. For these applications, closed transition transfer

switches can be provided.

当然会有一些负荷受任何微小的电源中断都会有影响。也有一些操作环境要求当条件允许时，某些负荷需由不停电电源供电。只有在这些应用中，CTTS

才有使用的必要。

When transferring loads in this manner during a test or when re-transferring to normal after power is restored, the switch will operate in a

make-before-break mode provided both sources are acceptable and in synchronism.

当电源恢复正常后，在测试状态下或正在以这种方式供电的负荷恢复正常时，在“make-before-break”（“动作于中断前”）模式下的开关就会动作

，同步恢复双路供电。

Typical parameters determining synchronism are: voltage difference less than 5%, frequency difference less than 0.2 Hz, and relative phase

angle between the sources of 5 electrical degrees.

决定同步动作的典型参数有：电压差小于百分之五，频率差小于0.2赫兹，相对相位与电源电角度相差在5度。

Since the maximum frequency difference is 0.2 Hz, the engine will generally be required to be controlled by an isochronous governor.

如果最大频率差大于0.2赫兹，那么同步控制器就会控制发电机启动。

It is generally required that the closed transition, or overlap time be less than 100 milliseconds. If either source is not present, or not

acceptable, such as when normal fails, the switch must operate in a break-before-make mode (standard open transition operation).

装置的闭路开启及重叠时间通常响应小于100毫秒。如果其中任何之一的电源不存在或者不合适，诸如常用电源中断，处在“make-before-break”（

“动作于中断前”）模式下的CTTS切换开关都会动作。（“make-before-break”，标准的开启传输切换）

Closed transition transfer makes code-mandated monthly testing less objectionable because it eliminates the interruption to critical loads,

which occur during traditional open transition transfer.

由于忽略了对重要负荷的电源中断，CTTS开关使得原来每月的逐条测试变得不那么令人反感。

其他

韩国汉萨株式会社生产制造的HANpro2000 和HANpro3000（最新产品）由上海韩发电气有限公司负责在中国销售。