春晨 YCB扁电缆 3*11+2*11
江苏春晨电缆有限公司
中国 淮安
产品属性
图文详情
品牌推荐
品牌
春晨
型号
YCB
特殊用途
功能化
导体材质
铜
护套材质
橡胶
型式
扁形
软硬
软
芯数
3
拉伸强度
12N
使用温度
70℃
电线最大外径
50mm
标称截面
50mm2
绝缘厚度
1.5mm
产品认证
加工定制
加工定制
jy
40
ht
20
dt
12
hh
10
rr
4
江苏春晨电缆有限公司生产春晨 YCB扁电缆 3*11+2*11，内部过电压
Internal Overvoltage
当电力系统内进行开关操作或者发生事故使系统内部参数发生变化时，电力系统将由一种稳定状态过渡到另一种稳定状态，在这个过程中，系统由于内部参数变化而引发电磁能量的振荡、传递和积累，并导致在某些设备上或系统中出现很高的过电压，称为内部过电压。内部过电压的大小与电网结构春晨 YCB扁电缆 3*11+2*11、系统容量及参数、中性点接地方式、故障性质、断路器性能、母线出线回路数以及操作方式等因素有关。内部过电压具有明显的统计性，研究各种内部过电压出现的概率及其幅值的分布不仅对于确定电力系统的绝缘水平具有非常重要的意义，而且是决定带电作业绝缘配合的主要依据。
When the internal parameters of power system change due to switch operation or accident, the power system will transition from one stable state to another. In this process, the system will cause electromagnetic energy oscillation, transmission and accumulation due to the change of internal parameters, and lead to high over-voltage on some equipment or system, which is called internal over-voltage Pressure. The magnitude of internal over-voltage is related to the grid structure, system capacity and parameters, neutral point grounding mode, fault nature, breaker performance, number of bus outgoing circuits and operation mode. Internal over-voltage is statistically significant. It is very important to study the probability and amplitude distribution of various internal over-voltage not only to determine the insulation level of power system, but also to determine the insulation coordination of live working.
内部过电压又可分为暂时过电压和操作过电压两大类，而暂时过电压包括工频 电压升高及谐振过电压。
Internal over-voltage can be pided into temporary over-voltage and operation over-voltage, while temporary over-voltage includes power frequency voltage rise and resonance over-voltage.
工频电压升高的主要原因有：空载长线路的电容效应、不对称短路引起的工频电压升尚、甩负荷引起的工频电压升局等。
The main reasons for the rise of power frequency voltage are: capacitance effect of no-load long line, power frequency voltage rise caused by asymmetric short circuit, power frequency voltage rise caused by load rejection, etc.
谐振过电压的产生则是由于电力系统中有许多电感、电容元件，其组合可以构成一系列不同自振频率的振荡回路，因此，在开关操作或故障时，只要某部分电路的自振频率与电源基波或某一谐波频率相等或接近，这部分电路就会出现谐振现 象。串联谐振通常会在系统内某一部分造成过电压。而且谐振过电压持续时间比较 长，往往造成严重后果，因此在设计时必须进行计算，防止产生谐振或降低谐波幅 值、缩短其存在时间。
Resonance over-voltage is produced because there are many inductors and capacitors in the power system. The combination of them can form a series of oscillation circuits with different natural frequencies. Therefore, when switching operation or fault, as long as the natural frequency of a part of the circuit is equal to or close to the fundamental frequency or a harmonic frequency of the power supply, resonance phenomenon will appear in this part of the circuit. Series resonance usually causes over-voltage in some part of the system. Moreover, the duration of resonance over-voltage is relatively long, which often causes serious consequences. Therefore, calculation must be carried out in the design to prevent resonance or reduce the harmonic amplitude and shorten its existence time.
Internal Overvoltage
当电力系统内进行开关操作或者发生事故使系统内部参数发生变化时，电力系统将由一种稳定状态过渡到另一种稳定状态，在这个过程中，系统由于内部参数变化而引发电磁能量的振荡、传递和积累，并导致在某些设备上或系统中出现很高的过电压，称为内部过电压。内部过电压的大小与电网结构春晨 YCB扁电缆 3*11+2*11、系统容量及参数、中性点接地方式、故障性质、断路器性能、母线出线回路数以及操作方式等因素有关。内部过电压具有明显的统计性，研究各种内部过电压出现的概率及其幅值的分布不仅对于确定电力系统的绝缘水平具有非常重要的意义，而且是决定带电作业绝缘配合的主要依据。
When the internal parameters of power system change due to switch operation or accident, the power system will transition from one stable state to another. In this process, the system will cause electromagnetic energy oscillation, transmission and accumulation due to the change of internal parameters, and lead to high over-voltage on some equipment or system, which is called internal over-voltage Pressure. The magnitude of internal over-voltage is related to the grid structure, system capacity and parameters, neutral point grounding mode, fault nature, breaker performance, number of bus outgoing circuits and operation mode. Internal over-voltage is statistically significant. It is very important to study the probability and amplitude distribution of various internal over-voltage not only to determine the insulation level of power system, but also to determine the insulation coordination of live working.
内部过电压又可分为暂时过电压和操作过电压两大类，而暂时过电压包括工频 电压升高及谐振过电压。
Internal over-voltage can be pided into temporary over-voltage and operation over-voltage, while temporary over-voltage includes power frequency voltage rise and resonance over-voltage.
工频电压升高的主要原因有：空载长线路的电容效应、不对称短路引起的工频电压升尚、甩负荷引起的工频电压升局等。
The main reasons for the rise of power frequency voltage are: capacitance effect of no-load long line, power frequency voltage rise caused by asymmetric short circuit, power frequency voltage rise caused by load rejection, etc.
谐振过电压的产生则是由于电力系统中有许多电感、电容元件，其组合可以构成一系列不同自振频率的振荡回路，因此，在开关操作或故障时，只要某部分电路的自振频率与电源基波或某一谐波频率相等或接近，这部分电路就会出现谐振现 象。串联谐振通常会在系统内某一部分造成过电压。而且谐振过电压持续时间比较 长，往往造成严重后果，因此在设计时必须进行计算，防止产生谐振或降低谐波幅 值、缩短其存在时间。
Resonance over-voltage is produced because there are many inductors and capacitors in the power system. The combination of them can form a series of oscillation circuits with different natural frequencies. Therefore, when switching operation or fault, as long as the natural frequency of a part of the circuit is equal to or close to the fundamental frequency or a harmonic frequency of the power supply, resonance phenomenon will appear in this part of the circuit. Series resonance usually causes over-voltage in some part of the system. Moreover, the duration of resonance over-voltage is relatively long, which often causes serious consequences. Therefore, calculation must be carried out in the design to prevent resonance or reduce the harmonic amplitude and shorten its existence time.
