ABB的REG670数字式保护继电装置是一款高性能的继电保护设备，具有以下特点：

1. 保护功能强大：支持多种保护功能，包括过流保护、过压保护、欠流保护、零序保护等，能够全面保障电力系统的安全。
2. 测量精度高：采用高精度的测量元件和算法，能够实时准确地测量电力系统的电流、电压、频率等参数。
3. 通讯能力强：支持多种通讯协议，如Modbus、CAN等，方便与其他的控制系统或智能设备进行数据交换和联动控制。
4. 人性化设计：具有易于操作的人机界面，支持多语言显示和定制化设置，满足不同国家和地区的需求。
5. 可靠性高：采用高品质的元器件和严格的质量控制，确保装置在各种恶劣环境下都能够稳定可靠地工作。

在应用场景方面，REG670数字式保护继电装置广泛应用于电力系统中的各种设备和线路保护，如变压器、发电机、电动机、高低压开关柜等。

至于其保护作用，REG670数字式保护继电装置能够实时监测电力系统的运行状态，一旦发现异常情况，如电流、电压超过设定值，设备温度异常等，立即采取相应的保护措施，如切断故障线路，通知运维人员等，从而保障整个电力系统的安全。

综上所述，ABB的REG670数字式保护继电装置具有强大的保护功能、高精度的测量能力、便捷的通讯能力和人性化的设计等特点，适用于各种电力系统的设备和线路保护。同时，它还能够实时监测电力系统的运行状态，采取相应的保护措施，保障电力系统的安全稳定运行。

ABB's REG670 digital protection relay device is a high-performance relay protection device with the following characteristics:

Powerful protection function: supports multiple protection functions, including overcurrent protection, overvoltage protection, undercurrent protection, zero sequence protection, etc., which can comprehensively ensure the safety of the power system.

High measurement accuracy: By using high-precision measurement components and algorithms, it is possible to accurately measure parameters such as current, voltage, and frequency of the power system in real time.

Strong communication capability: Supports multiple communication protocols such as Modbus, CAN, etc., facilitating data exchange and linkage control with other control systems or intelligent devices.

Humanized design: With an easy-to-use human-machine interface, supporting multilingual display and customized settings, it meets the needs of different countries and regions.

High reliability: By using high-quality components and strict quality control, the device can operate stably and reliably in various harsh environments.

In terms of application scenarios, the REG670 digital protection relay device is widely used in various equipment and line protection in power systems, such as transformers, generators, motors, high and low voltage switchgear, etc.

As for its protective function, the REG670 digital protection relay device can monitor the operating status of the power system in real time. Once abnormal situations are found, such as current and voltage exceeding the set value, abnormal equipment temperature, etc., corresponding protective measures are immediately taken, such as cutting off faulty lines, notifying operation and maintenance personnel, etc., to ensure the safety of the entire power system.

In summary, ABB's REG670 digital protection relay device has strong protection functions, high-precision measurement capabilities, convenient communication capabilities, and user-friendly design, making it suitable for equipment and line protection in various power systems. At the same time, it can also monitor the operating status of the power system in real time, take corresponding protective measures, and ensure the safe and stable operation of the power system.