REB670 1MRK002820-AC REB670 智能微机保护装置

确保正确动作
REB670实现了快速性与稳定性的完美结合，这对母线保护来讲尤为重要。对大多数区内故障，无论母线上连接的间隔数量多少，REB670均能在极短的时间内动作，典型为12ms；同时对于区外故障，即使CT严重饱和，仍能保证极其稳定。由于其独特的测量原理，REB670装置与其它数字式差动保护装置相比，对主CT的要求更低，可与其它保护装置共用一组CT，从而有效的降低成本。在一个周波内，只要CT在2ms内不饱和，REB670就能保证稳定、正确动作。同时，REB670针对区内故障极其灵敏，保护您的电气装置免受各种损害，相应缩短了维修时间。另外，REB670还能快速检测、正确切除各种发展性或转换性故障。
卓越性能
REB670集成了多种算法，包括两种差动原理：一种是标准的低阻抗差动，另一种是灵敏动作特性的差动。后者适用于低阻抗接地的电力系统，其接地电流由于中性点电阻或电抗器限制为300-2000A时，REB670能可靠检测到区内各种接地故障。另外，灵敏动作特性也适用于长线路对母线充电，需要高灵敏
度的场合。REB670以其新颖的、快速的算法，在CT回路开路时能及时检测并闭锁母线保护。可以利用CT回路开路监视选择复归逻辑，CT回路恢复正常时母线保护功能可以重新恢复。CT监视回路功能也能发告警信号并触发录波。

REB670

REB670 Intelligent microcomputer protection device is known for flexibility of application. It is specially designed for the protection and monitoring of power system busbars, T-connected lines and branch lines, and has a wide range of applications from medium voltage to ultra-high voltage. Its expandable input and output hardware modules
The REB670 is designed to meet the needs of the bus differential protection in a variety of wiring types including single bus, double bus with or without side bus, double circuit breaker and one and a half circuit breaker.
The REB670 can be selectively and reliably removed quickly for all types of phase ground or ground in protected areas in power systems with direct or low impedance ground. For ungrounded or high-resistance grounded power systems, various types of multiphase faults in the protection area can operate correctly.
The REB670 provides complete busbar protection in addition to differential protection and built-in flexible automatic selection of dynamic zones (corresponding to isolation switch position). This enables the device to dynamically connect CT to different busbar protection areas, and simultaneously realize the functions of busbar protection and circuit breaker failure trip selection and status monitoring of isolation switch and circuit breaker. Due to its unique measurement principle, the REB670 device requires less master CT than other digital differential protection devices.
Sophisticated busbar protection technology
ABB busbar protection has a very good supply record and user reputation. ABB busbar protection devices started with analog relays such as INX2/5, RADSS, REB101/103, which have been in successful operation for more than 40 years, while ABB digital busbar protection devices REB500 and RED521 have more than 10 years of operation experience. All of these devices create an impressive record: there has never been a misoperation due to device reasons. Today, more than 20,000 busbars around the world are using ABB’s busbar protection.

Ensure correct action
REB670 achieves the perfect combination of speed and stability, which is particularly important for busbar protection. For most regional faults, REB670 can operate in a very short time, typically 12ms, regardless of the number of intervals connected on the bus. At the same time, for out-of-area faults, even if the CT is heavily saturated, it can still ensure extremely stable. Due to its unique measurement principle, the REB670 device requires less master CT than other digital differential protection devices and can share a set of CT with other protection devices, thus effectively reducing costs. As long as CT is not saturated within 2ms in a cycle, REB670 ensures stable and correct action. At the same time, REB670 is extremely sensitive to faults in the area, protecting your electrical installations from all kinds of damage and reducing repair time accordingly. In addition, REB670 can quickly detect and correctly remove a variety of developmental or transformational faults.
Excellent performance
REB670 integrates a variety of algorithms, including two differential principles: a standard low-impedance differential and a differential with sensitive action characteristics. The latter is suitable for power systems with low impedance ground, where the ground current is limited to 300-2000A due to neutral resistance or reactor, REB670 reliably detects a variety of ground faults in the area. In addition, the sensitive action characteristics are also suitable for long lines to charge the bus, which requires high sensitivity
Degree of occasion. With its novel and fast algorithm, REB670 can detect and lock the busbar protection in time when the CT circuit is open. CT circuit open monitoring can be used to select the return logic, and the bus protection function can be restored when CT circuit returns to normal. The CT monitoring loop function can also send alarm signals and trigger wave recording.