ABB?5SHY3545L0010?3BHB13088R0001?3BHE009681R0101?GVC750BE101?勵磁控制單元
確定未來功率半導體通常是設計的第一步電力電子設備。5SHY3545L0010 3BHB013088R0001如果額定值太接近操作值故障的風險將很大，
對設備可用性產生不利影響。如果選擇了額定電壓，總體而言，安全余量過大
效率和性能將受到影響，因為更高額定設備需要：硅越厚，產生的功率越高損失。
1.導言
5SHY3545L0010 3BHB013088R0001供電網絡條件和設備設計均決定
半導體將暴露的預期電壓。沒有簡單的規則涵蓋所有應用程序和
評級必須根據具體情況確定。本申請說明
通過根據年份對最常見變頻器類型的各種建議進行整理，為電壓選擇提供指導
電力電子領域的經驗。
這些建議僅適用于單個設備。復雜性
設備串聯引入不在范圍內
本應用說明的。
1.1.參數定義3BHE009681R0101 GVC750BE101
以下數據表中定義了幾種阻斷電壓：
高功率半導體。各種
本節對評級進行了說明。當然，
標準化，可在各種國際標準中找到
例如IEC 60747。
區分重復過電壓非常重要
VDR/VRR（在線路頻率出現的換向過電壓）和出現的非重復過電壓浪涌VDS/VRS
應用說明53BHE009681R0101 GVC750BE101隨機地（例如，由于雷電和網絡瞬態）。
單個電壓浪涌過高將導致半導體雪崩擊穿，重復電壓峰值過高
即使這些重復電壓的電壓水平低于雪崩擊穿極限，也可能導致熱“失控”。直流電壓以不同的方式對半導體施加應力，將對此進行解釋后來
The circuit designer encounters the problem of over-voltages in two different electrical contexts.The first,which may be referred to as a?controlled environment?is one in which a transient is generated within a known piece of equipment and by a specific circuit component,such as a mechanical or solid state switch operating in an inductive circuit.Such transients can be quantified in current,voltage,time and wave-shape by circuit analysis or measurement.In these circumstances the electrical environment is known or?controlled?.By contrast,the second case,considered to be an?uncontrolled environment?defies circuit analysis and also,in general,measurement.This is the case of equipments peripheral to large distributed networks such as power grids.Such?infinitely?distributed networks act as vast?aerials?capturing and transmitting electrical disturbances either from lightning strokes,distribution faults or load-switching by other users.The rational choice of semiconductor voltage rating in such environments starts with a statistical knowledge of the transients in the system.It should be noted that IEC 60664 uses the terms?controlled?and?uncontrolled?in a wider sense to differentiate between systems where transients are completely unknown(unprotected,line-operated)and those where they are either known(internally generated)or limited to well defined levels(protected line-operated systems).
