Protection&Control Transmission Line Protection Busbar Protection Transformer Protection Circuit Breaker Protection Generator Protection Feeder Protection Capacitor Protection Motor Protection Transfer & Synchronization Arc Protection
Digital Substation PCS-221S Merging Unit PCS-221 Merging Unit PCS-222 Circuit Breaker Controller PCS-9250 AC Electronic CT/VT
Automation PCS-9700 Automation System PCS-9700 HMI Software PCS-9705 Bay Control Unit PCS-9705S Bay Control Unit PCS-9799 Station Manager PCS-9799S Station Manager PCS-9710 Remote Terminal Unit PCS-9710S Remote Terminal Unit PCS-9794 Protocol Converter PCS-9785 Satellite-Synchronized Clock PCS-9882 Ethernet Switch PCS-9882Rx DIN Rail Managed Ethernet Switch PCS-9882XD Managed Ethernet Switch PCS-9884 Managed Ethernet Switch Supporting HSR and PRP MUX-2M/64 Communication Interface
Phasor Measurement PCS-997S Fault Line Locator PCS-996S-G Phasor Data Concentrator PCS-996 Phasor Measurement Unit
Disturbance Fault Recording PCS-996RC Disturbance Fault Recorder PCS-996R Disturbance Fault Recorder PCS-986 Disturbance Fault Recorder PCS-9013 DFR Management System
Stability Control System PCS-992 Power Stability Control System PCS-993 Out-of-Step Controller PCS-994 Frequency & Voltage Controller PCS-994S Frequency and Voltage Controller
Power Grid Monitoring and Control PCS-9000 Energy Management System PCS-9000 Distribution Management System
Configuration Tool PCS-Torch MOT Tool PCS-Studio Configuration Tool PCS-Explorer IED Configuration & Debugging Tool PCS-SCD Configuration Tool PCS-COMM Configuration & Debugging Tool
Accessories MD1501 Series Auxiliary Relays MD1701 Series Test Blocks MD1701S Test Block
FACTS PCS-9580 Static Var Compensator PCS-9583 Static Synchronous Compensator PCS-9570 Series Compensation PCS-9590 DC De-Icer PCS-9578 Controllable Shunt Reactor PCS-8200 Unified Power Flow Controller PCS-9571 Fault Current Limiter PCS-9564A Dynamic Voltage Restorer PCS-9569 Shore Power System
HVDC PCS-8600 UHVDC Converter Valve System PCS-9550 LCC-HVDC Control and Protection System PCS-8100 VSC-HVDC IGBT Valve PCS-9520 VSC-HVDC Control and Protection System PCS-9510 Cooling System PCS-8300 High-voltage DC Circuit Breaker PCS-9250 DC Electronic CT/VT
PV & Wind Power Grid-Connection PCS-9700 Renewable Energy SCADA PCS-9726 Generation Management Unit PCS-9700F Power Forecast System PCS-9700R AGC/AVC
Battery Energy Storage System PCS-9567TU-1000/1250/1375/1575/1750 1500V Series Outdoor Power Conversion System PCS-8811CB Centralized energy storage system PCS-8812PB Liquid cooled energy storage cabinet PCS-8813CPB High voltage directly connected energy storage system PCS-9567A Power Conversion System PCS-9567C BESS Control Unit PCS-9700 Energy Storage System
Microgrid PCS-9617MG Microgrid Controller
Static Frequency Converter PCS-9575 Static Frequency Converter
Protection,Automation&Control DMS EMS Stability Control & WAMS Digital Substation
HVDC & FACTS De-Icing Unified Power Flow Controller (UPFC) Series Compensation Static Synchronous Compensator(STATCOM) Static Var Compensator (SVC) LCC-HVDC Transmission VSC-HVDC Transmission
Renewable & Microgrid Energy Storage System Microgrid PV Generation SFC
Power Generation Pumped Storage Power Plant Nuclear Power Plant Hydro Power Plant Thermal Power Plant
Transmission System AC Transmission LCC-HVDC Transmission VSC-HVDC Transmission
Distribution System Distribution Network
Industrial Consumer Urban Track Traffic Electrified Railway Oil & Petrochemical Metals & Mining
PCS-8351 fast switching fault current limiter developed by NR was officially put into operation after 168 hours of stable operation in Xinjiang，China on September 25, 2021.
This project solves the problem of excessive short-circuit current caused by centralized transmission of renewables, reduces the impact of short-circuit current on electrical equipment of main power grid, and improves the flexibility and reliability of power grid regulation.
In recent years, northwest power grid, as the main base of renewable energy transmission in China, the power grid capacity is increasing. The expected short-circuit current of many high-voltage substation buses exceeds the breaking capacity of circuit breakers, which poses a threat to the safe and stable operation of the power grid.
NR gives full play to the advantages of multi-disciplinary integration, relies on the rich experience accumulated in the field of system analysis and protection system for many years, and provides a package of solutions for Xinjiang power grid users in combination with the key research and practical application of emerging technologies such as high-voltage AC and DC fast switching.
NR participated in the whole process from the comparison and selection of multiple schemes in the initial stage, the planning of installation and site selection, to the analysis of system stability and relay protection impact, to the formulation of the final scheme, and the acceptance and operation of on-site installation and commissioning. Through the installation of PCS-8351 fault current limiter in the first and second lines of 220kV Shixilu respectively, the current limiting reactor is put into operation in case of fault. The short-circuit current of 220 kV side bus of Fenghuang transformer is effectively limited, and the critical problem of excessive short-circuit current is solved, which has been unanimously recognized by users.
NR PCS-8351 fault current limiter adopts modular design, which can cover multiple voltage levels from 10kV to 500kV and meet the different current limiting requirements. It has simple structure and is compatible with open and enclosed layout. The maximum breaking current can reach 63kA and the fastest fault response time is less than 10ms.
No additional system loss is added during steady-state operation of the system, so as to save energy and increase efficiency. In case of fault, the vacuum breaker is tripped, and the current limiting reactor is quickly put into operation to limit the short-circuit current.
No harmful gas is generated during disconnection, which is environment-friendly and maintenance free. After the fault is cleared, it will automatically reclose and restore the lossless operation state to minimize the impact on the system.
The successful application of PCS-8351 fault current limiter in Xinjiang power grid highlights the leading position of NR fast switching products in the field of high-voltage power grid, and provides a practical and innovative solution to the increasingly prominent problem of power grid short-circuit current exceeding the limit.