ABB SPAJ140C 继电保护装置

SPAJ140C是一种组合式过电流与接地故障继电器，属于继电保护装置的一种。它主要用于直接接地、电阻接地或阻抗接地电力系统中的辐射式馈线，作为有选择性的短路和接地故障保护。当电力系统中的电力元件或电力系统本身发生故障危及电力系统安全运行时，SPAJ140C能够及时向运行值班人员发出警告信号，或者直接向所控制的断路器发出跳闸命令以终止这些事件发展。

SPAJ140C继电保护装置包括一个过流单元和一个接地故障单元，具有灵活的跳闸和信号设施。过流和接地故障继电器还可用于需要单相、两相或三相过流保护的其他应用。它是ABB配电自动化概念的一部分，是ABB控制和管理电力系统的完整解决方案。

SPAJ140C继电保护装置的设计使其能够连接到被保护对象的电流互感器上，三相过流装置和接地故障装置连续测量物体的相电流和中性线电流。当检测到故障时，继电器会根据应用要求和继电器配置启动、跳闸断路器、提供报警信号、记录故障数据等。当设定的操作时间结束后，过流装置开始工作。当接地故障电流超过低设定级I0>的设定启动电流时，接地故障单元启动，并在接地故障电流超过低设定级I0>的设定启动电流后，发出启动信号。

总之，SPAJ140C继电保护装置是一种重要的电力系统保护设备，能够提高电力系统的安全性和可靠性，避免故障对电力系统造成损害。

SPAJ140C is a combination overcurrent and ground fault relay, belonging to a type of relay protection device. It is mainly used for radiation type feeders in directly grounded, resistance grounded, or impedance grounded power systems as selective short-circuit and ground fault protection. When power components in the power system or the power system itself fail and endanger the safe operation of the power system, SPAJ140C can promptly issue warning signals to the operating duty personnel, or directly issue trip commands to the controlled circuit breakers to terminate the development of these events. The SPAJ140C relay protection device includes an overcurrent unit and a ground fault unit, with flexible tripping and signal facilities. Overcurrent and ground fault relays can also be used in other applications that require single-phase, two-phase, or three-phase overcurrent protection. It is part of ABB’s distribution automation concept and a complete solution for ABB’s control and management of power systems. The design of the SPAJ140C relay protection device enables it to be connected to the current transformer of the protected object, and the three-phase overcurrent device and ground fault device continuously measure the phase current and neutral line current of the object. When a fault is detected, the relay will start, trip the circuit breaker, provide alarm signals, record fault data, etc. according to the application requirements and relay configuration. After the set operating time is over, the overcurrent device begins to operate. When the ground fault current exceeds the set starting current of the low setting level I0>, the ground fault unit starts and sends a starting signal when the ground fault current exceeds the set starting current of the low setting level I0>. In summary, the SPAJ140C relay protection device is an important power system protection device that can improve the safety and reliability of the power system, and avoid damage caused by faults to the power system.

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