750/760馈线保护系统是一个用于管理的数字继电器一次保护和控制配电馈线。这很容易使用继电器提供保护馈线和后备保护功能用于母线、变压器和输电线路以降低产品生命周期成本。时间和瞬时过电流750/760具有两相TOC元件每相配备液位检测器。这个750/760还具有两个过电流元件常用于初级和背部向上保护。每个TOC元素都具有以下可编程特性:
•跳闸、报警或报警的拾取电流水平
控制
•选择15种曲线形状(包括
FlexCurves)和曲线乘数
•线性或瞬时复位
特征
•电压限制
GE SR750-P5-G1-S1-HI-A20-R
The 750/760 has two phase IOC elements with level detectors for each phase. Each IOC element has a programmable pickup current, a time delay during which current must exceed the pickup for operation, and the minimum number of phases required for operation.750/ 760 employed to provide transformer back up protection (grounded wye windings and autotransformers) using the RGF feature. Voltage Protection Overvoltage/Undervoltage protection features can cause a trip or generate an alarm when the voltage exceeds a specified voltage setting for a specified time. Voltage protection includes a negative sequence voltage element to detect abnormal system unbalance conditions, and a neutral displacement voltage element using the calculated zero sequence voltage (3V0) to detect ground faults
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3,《PLC可编程输送控制系统》
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750/760 provides functionality to improve network (grid) stability using voltage or frequency based techniques. Also allows to provide back up protection and trip breakers directly when protecting generators and other frequency sensitive power equipment. • 2 Under-frequency elements (81U) • 2 Over-frequency elements (81O) • Frequency decay: 4 df/dt elements (59/81) • 2 Undervoltage elements Reverse power detection 750/760 relay allows to trip or alarm when power flows against the intended direction. In systems having in-plant generation parallel to the utility supply, detection of power flow toward the utility is necessary. For such applications, 750/760 eliminates requirement for separate device to detect power flow direction and reduces overall cost. This feature can also be used to detect motoring power into the generator. Synchronism Check Breaker closing can be supervised by ∆V, ∆f and ∆Hz setpoints. Dead-source Phase directional (for phase A). alternatives are provided.