NR Electric Co., Ltd.
NR Electric Co., Ltd.
Function Index
Transformer Protection
PCS-978 Transformer Protection The PCS-978 provides a full-scheme protection and control solution for any type of transformer as well as shunt reactor applications. The PCS-978 can be implemented across a variety of transformers including, two-winding, three-winding, and autotransformers.
PCS-974 Mechanical Protection The PCS-974 mechanical protection provides sixteen high-power-pickup binary inputs dedicated to the mechanical relays in field, so as to realize the mechanical tripping/alarm with or without time delay.
PCS-9671 Transformer Current Differential Protection The PCS-9671 is a numerical relay designed for the protection of two-winding or threewinding transformers with a maximum of three CT inputs. It also can be used to protect reactors or implemented as a stub current differential protection in a one-and-a-half breaker arrangement.
Function
PCS-974
PCS-9671
Transformer restrained current differential protection
87PT
√
√
87UT
√
√
Transformer DPFC differential protection
87DT
√
Reactor restrained current differential protection
87PR
√
Reactor unrestrained current differential protection
87UR
√
Reactor DPFC differential protection
87DR
√
Inrush blocking
√
√
CT saturation blocking
√
√
Overexcitation blocking
√
√
CT failure blocking
√
√
Amplitude compensation
√
√
Phase angle compensation
√
√ √
Restricted earth fault protection
REF
√
Winding differential protection
87W/87N
√
Inter-turn fault protection for reactor
32G/21G
√
Overexcitation protection
24
√
Four stage underfrequency protection
81U
√
Four stage overfrequency protection
81O
√
Mechanical protection based on high-power-pickup binary inputs
MR
√
Temperature protection
26
√
Phase-to-phase impedance protection
21P
√
Phase-to-ground impedance protection
21G
√
68
√
Phase overcurrent protection
67P, 50/51P
√
Neutral overcurrent protection
67NP, 50/51N
√
Power swing blocking
50/51Q
√
Phase overvoltage protection
59P
√
Ground overvoltage protection
59G
√
Positive-sequence undervoltage protection
27P
√
49
√
Breaker failure protection
50BF
√
Pole discrepancy protection
62PD
√
Phase overcurrent alarm element
50PAlm
√
Ground overvoltage alarm element
59GAlm
√
Thermal protection
Read more on the web www.nrelect.com
PCS-978
Transformer unrestrained current differential protection
Negative sequence overcurrent protection
66
Functional Code
√
√
Voltage and current drift auto adjustment
√
√
Frequency tracking
√
√
IDMT characteristic for overcurrent
√
√
CT failure supervision
√
√
VT failure supervision
√
Fault recorder
√
√
√
GPS clock synchronization (IRIG-B, SNTP, PPS, PPM)
√
√
√
Configurable I/O and LED
√
√
√
Programmable logic
√
√
√
Up to four Ethernet ports using IEC 61850, DNP 3.0 or IEC 60870-5103 over TCP/IP
√
√
√
Up to two serial ports using IEC 60870-5-103
√
√
√
Optional sampling Value & GOOSE module with six optical Ethernet ports using IEC 61850-9-2 and IEC 61850-8-1 GOOSE
√
√
√
Read more on the web www.nrelect.com
67