RET670 1MRK004816-AC 发电机变压器块单元

【产品详情】

RET670为二绕组和三绕组变压器，自耦变压器，升压变压器和发电机变压器块单元，移相变压器，特种铁路变压器和并联电抗器提供快速和选择性保护，监测和控制。IED被设计为在很宽的频率范围内正确工作，以适应电力系统在干扰和发电机启动和关闭期间的频率变化。

RET670具有快速、低阻抗差动保护功能，对ct的要求非常低。它适用于具有多达六个约束CT输入的多断路器安排的差分应用。差动保护功能具有二次谐波和波形块约束功能，以避免CT饱和和变压器涌流跳闸，并具有五次谐波约束功能，以避免变压器过励磁跳闸。

差分功能通过使用基于幅度测量和负序分量方向比较的灵敏差分保护功能，为低电平内部故障提供了高灵敏度。

RET670 1MRK004816-AC 发电机变压器块单元

【英文介绍】

The RET670 provides fast and selective protection, monitoring and control for two - and three-winding transformers, autotransformers, booster transformers and generator transformer block units, phase shifting transformers, special railway transformers and shunt reactors. IED is designed to work correctly over a wide frequency range to accommodate frequency changes in the power system during interference and generator start-up and shutdown.

The RET670 features fast, low-impedance differential protection with very low ct requirements. It is suitable for differential applications in multi-circuit breaker arrangements with up to six constrained CT inputs. Differential protection features second harmonic and waveform block restraint to avoid CT saturation and transformer inrush current tripping, and fifth harmonic restraint to avoid transformer overexcitation tripping.

Differential function provides high sensitivity for low-level internal faults by using sensitive differential protection based on amplitude measurement and negative sequence component direction comparison.

RET670 1MRK004816-AC 发电机变压器块单元

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