NR Electric Co., Ltd.
PCS-9656
Arc Flash Relay
The PCS-9656 relay provides a fast busbar protection in It integrates the protection calculation, tripping output, event
substations, power plants and industrial enterprises. In case of recording, and human-machine interaction etc. This device can
short circuit faults in switchgear, the arc faults in the protected be installed in a protection panel or local switchgear.
area which is covered by arc sensors can be quickly cleared via
arc protection, avoiding harm to personnel and assets. The arc Arc sensor is locally installed in appropriate points in the case of
protection uses arc sensors to detect the arc light caused by the cubicles inside of the switchgear, to transmit arc signals to
short circuit faults. arc protection, which will perform optic-electric conversion. The
optical signal transmission between sensors and arc protection
PCS-9656 relay can acquire the incoming line currents and arc can avoid electromagnetic interference and improve reliability
Arc Protection
flash signals via localized arc sensors to reliably discriminate the during transmission.
arc faults. Up to 12 current inputs can be integrated in one unit.
PCS-9656
Cabinet X Cabinet Y
Busbar
PCS-9656 PCS-9656
Arc Arc Arc Arc Arc Arc
probe probe probe probe probe probe
Cabinet M …… Cabinet N Cabinet K …… Cabinet L Cabinet S …… Cabinet T
Figure 1 PCS-9656 Functional Block Diagram
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Single-unit or multi-unit arc protections are supported by PCS-
9656 relays. Single-unit protection can provide up to 24 arc
sensors, as well multi-unit protection can provide over 24
sensors. Series connection of several units can be performed
to realize the protection with 24+ arc sensors, implementing
multi-unit arc protection. Up to 3 point-to-point optical ports are
provided in one unit for series connections among the units.
Typical applications are as follows:
• Single Busbar
The single-unit or multi-unit of PCS-9656 can be chosen
according to the number of bay units.
• Single Busbar with Section, no more than 24 Sensors
• Single Busbar with Section, Over 24 Sensors
Figure 2 PCS-9656 Functional Block Diagram
Functions
Protections
• Arc Protection
• Breaker Failure Protection for up to 6 breakers (50BF)
Monitoring
• Arc intensity supervision
• CT failure supervision
• Transfer/Receive module supervision
• Self-Diagnostic
Measurement
• Phase current: Ia, Ib, Ic
• Sequence current: positive/negative/zero sequence current
Figure 3 PCS-9656 Functional Block Diagram (I1, I2, I0)
• Phase angle: Ia^Ib, Ib^Ic, Ic^Ia
Recording
• 64 trip reports
• 1024 self-diagnostic reports
• 1024 logging reports
• 1024 SOE
• 64 fault records with oscillograms compatible with
COMTRADE
Communication
• Up to four (4) Ethernet ports for automation (Optional)
• Two (2) RS-485 serial ports for automation
• One (1) faceplate RJ-45 port for commissioning
• Complying with IEC 61850-8-1 MMS, IEC 60870-5-103 and
Figure 4 PCS-9656 Functional Block Diagram DNP 3.0
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Features • The tripping outputs can be configured via tripping matrix to
set different tripping zones. The relay can trip different zones
sequentially in order to minimize the outage area.
• The innovative technology of Deviation of Power Frequency
Component (DPFC) is adopted in this relay. The current
• Up to six breaker failure protections (50BF) are integrated
criteria based on DPFC technology utilize the change-of- in this relay. Two criteria can be selected for breaker failure
current to realize the fast detection of faults. protection: one is circuit breaker position; the other is both
circuit breaker position and feeder currents.
• The relay provides both single-criteria (arc) and dual-criteria
(current and arc) to guarantee fast and reliable operation. • Clock synchronization supports pulse per second, SNTP and
When dual-criteria is enabled, the typical operation time IRIG-B.
(including output relay time) is less than 10ms.
• Continuous self-diagnostics is integrated in this relay,
• The passive optic sensor, based on photometry cosine including hardware/software self-diagnostic, communication
principle, realizes the analog optic signal transmission and monitoring and arc sensor connection monitoring.
has a strong immunity against interference.
• Up to four 100Mbps Ethernet ports or two RS-485 serial
• Arc sensor continuously monitors ambient light intensity ports are provided for SCADA communication, complying
during normal service state. This device will continuously with IEC 61850-8-1 MMS, IEC 60870-5-103 and DNP 3.0
track ambient light, and automatically change operating
threshold. • Simulation outputs without current/voltage injection are
provided to make on-site maintenance easier.
• Fault locator function is provided in this relay. Fault position
and fault information can be displayed on the LCD screen. • Up to 64 trip reports, 1024 self-diagnostic reports,1024
logging reports and 1024 SOE are provided.
• Tripping outputs adopt high-speed contacts using combined
IGBT and output relay, the delay time of output contacts is • Up to 64 fault oscillograms compatible with COMTRADE
less than 1ms. As well, the conventional output contacts can format are provided, each oscillogram includes AC quantities,
be supplied according to customer specifications. Binary Inputs/Outputs and arc intensity.
Arc Protection
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