REB670智能化微机保护装置专为电力系统母线、T接线路、支接线路的保护、监视而设计。从中压到超高压网络均可适用。其可扩展的输入/输出硬件模块，能满足单母线及双母线带或不带旁母后的接线、双断路器接线及一个半断路器接线的各种需要。
针对直接接地或低阻抗接地的电力系统，保护区内各种类型的相-相及相-地故障REB670均能有选择地、可靠地快速切除故障。REB 670对大多数区内故障、无论母线上连接间隔的数量多少，它均能在极短的时间内动作，典型为12ms;同时对区外故障，即使CT严重饱和，仍能保证其稳定。而且REB670对于不接地或高阻接地的电力系统，保护区内各种类型多相故障均能正确动作。
REB670能提供完整的母线保护，除了差动保护功能，装置还内置灵活的动态故障区域自动选择（对应隔离开关位置），能实现CT动态连接至不同的母线保护段、母线保护和断路器失灵跳闸出口的选择、隔离开关用断路器的状态监视等功能。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要求更低。
REB670所具有的平台和理念是基于670系列产品的共性：
1-phase bus differential relay using auxiliary summation CT's
REB 101 is a high-speed differential relay of the percentage stabilised type for phase and earth-fault detection and can be used for busbars at all voltage levels. Internal faults are measured before saturation of the current transformer. Stability for external faults is guaranteed also at instantaneous saturation of the current transformer.
In gas insulated switchgears the current transformer cores in the bushings can preferably be used. The total gas insulated switchgear will then be included in the measuring zone of the bus protection.
Intermediate summation current transformers are used for adjustment of the CT-ratios and to reduce the secondary current. They are also used to galvanically separate the primary from the measuring circuit of the relay.
Main Features:
- Percentage restrained differential relay for phase-to-phase and phase-earth faults
- Microprocessors in logic- and time-circuits with self supervision
- Measuring time 1-3 ms and trip impulse from REB 101 within 6-9 ms
- Full stability for through-going fault currents even when current transformers are totally saturated
The fully numerical decentralized busbar protection REB500 with integrated breaker failure protection is designed for the high-speed and selective protection of MV, HV and EHV busbar installations at a rated frequency of 50, 60 and 16.7 Hz. The structure of both hardware and software is modular enabling the protection to be easily configured to suit the layout of the primary system. The flexibility of the system enables all configurations of busbars from single busbars to quadruple busbars with transfer buses, ring busbars and 1½ breaker schemes to be protected. The capacity is sufficient for up to 60 feeders (bay units) and a total of 32 busbar zones.
The numerical busbar protection REB500 detects all phase and ground faults in solidly grounded and resistive-grounded power systems and phase faults in ungrounded systems and systems with Petersen coils. The main CTs supplying the currents to the busbar protection have to fulfill only modest performance requirements. The protection operates discriminatively for all faults inside the zone of protection and remains reliably stable for all faults outside the zone of protection.
Main features:
- Multiple and reliable measurement criteria to achieve maximum security
- Continuous self-supervision enhances reliability and availability
- Functionality is mainly defined by software
- Integrated monitoring capabilities
- Integrated disturbance recording for optimal fault evaluation
- Integrated event recording for sequence of events analysis
- Modular design reduces spares stocking levels
- Integration into substation automation / monitoring systems (IEC61850-8-1 / LON / IEC60870-5-103)
Customer benefits:
- Fast and selective clearance of busbar faults
- Reliable fault isolation
- Avoid heavy damages of primary and secondary equipment
- Prevent cascading trips
- Keep power losses small
- Maintain maximum power availability
REB103
3-phase bus differential relay
The REB 103 bus differential relay is a high-speed percentage restrained differential relay. The operating time for an internal bus fault is 1-3 ms and trip impulse is sent to the breakers within 6-9 ms. The high speed of operation ensures power system stability also for busbar faults with very high fault currents.
REB 103 is suitable for all types of bus configurations: 1, 2, 3 and 6-zones, with switching of CT secondary circuits. Full stability is guaranteed during the switching operations, owing to the method of reconnecting the circuits and, also, by the percentage operating and starting relay features.
Intermediate current transformers are used for adjustment of the CT-ratios, other relays can be inserted in the same CT-loop.
Main Features:
- Percentage restrained differential relay for phase-to-phase and phase-earth faults
- Very high E/F-sensitivity of the differential relay element in directly earthed networks
- High speed of operation, detecting an internal fault within 1-3 ms and sending an output trip signal within 6-9 ms
- Fully stable in the event of faults outside the protected zone
REB500sys
The fully numerical decentralized station protection REB500sys combines busbar- and breaker failure protection with integrated line- and transformer protection incl. station monitoring.
REB500sys is designed for the high-speed and selective protection of MV, HV and EHV busbar installations at a rated frequency of 50 and 60 Hz. The capacity is sufficient for up to 60 feeders (bay units) and a total of 32 busbar zones and it covers the protection and monitoring of the whole substation, i.e. busbars, line and transformer feeders.
The station protection REB500sys is foreseen for all single or double busbar configurations. Triple busbars configurations are also possible, but require some attention regarding the I/O configuration. In 1½ breaker configurations, the bay level functions autoreclosure and synchrocheck bring significant advantages.
The REB500sys detects all bus faults in solidly and low resistive-grounded power systems, all kind of phase faults in ungrounded and compensated power systems as well as feeder faults in solidly, low resistive-grounded, compensated and ungrounded power systems. The protection operates selectively for all faults inside the zone of protection and remains reliably stable for all faults outside the zone of protection.
REB500sys is perfectly suited for retrofit concepts and stepwise upgrades. The bay unit can be used as a stand-alone unit for bay protection functions (e.g. line protection, autoreclosure, synchrocheck or transformer protection). The central unit can be added at a later stage for full busbar and breaker failure protection functionality.
REB500sys applications
Depending on the voltage level and protection philosophy, the following protection concepts are frequently encountered:
- Main 1 and main 2 protection devices per feeder and one busbar protection
The REB500sys station protection enables this protection concept to be simplified, thanks to a higher degree of functional integration. By replacing one of the two main protection devices, the same level of substation protection is maintained whilst cost and space of an extra device are saved and the costs over the complete life cycle are reduced.
- One main protection device and a back-up protection per feeder, no busbar protection
For this situation in the future, REB500sys enables the availability of your energy supply to be increased by additional busbar and breaker failure protection in substations where this was not possible up to now for economical reasons.
- In retrofit projects
The protection scheme is enhanced and comprehensive monitoring added
Main features:
- Combined busbar- and breaker failure protection with integrated line or transformer protection incl. station monitoring
- De-central & modular architecture
- All measurements such as current, voltage, busbar zone differential currents, etc. are displayed centrally for status monitoring
- Integrated event - and disturbance recorder supports a quick analysis of fault situations of the complete substation
- Integration into substation automation / monitoring systems (IEC61850-8-1 / LON / IEC60870-5-103)
- All applications are covered by a common PC-based configuration and setting program.
Customer benefits:
- Improved availability of energy supply
- Significant reduction of project execution time, installation and life – cycle cost due to higher integration of functionality
- The protection concepts with REB500sys are simpler and provide at the same time an increase in security
- Fast fault isolation and clearance to prevent cascading trips and keep the power losses small
- Avoiding heavy damages of primary and secondary equipment
- The system is more uniform due to the reduction in the number and type of devices.
- The monitoring of breaker and isolator positions, transducers and of the REB500sys itself permits a reduction in periodic maintenance work, but nevertheless provides an immediate recognition of failures
