Shenzhen Shuanghe SH-DFR Power Fault Recording Device

Product Introduction
The SH-DFR series power fault recording device is a new type of power fault recording device developed by Shenzhen Shuanghe Electric Co., Ltd. based on the original series of fault recorders. This device is mainly suitable for substations with voltage levels of 110kV and above, enabling the access of SV and GOOSE digital signals or mixed access with conventional quantities. It features various functions such as transient recording, steady-state recording, message recording, real-time operation monitoring, waveform analysis, and fault location. The SH-DFR series power fault recording device strictly follows IEC61850-7 and the State Grid Corporation's IEC61850 implementation specifications for modeling. The station control layer communication adopts the MMS method, fully complying with the requirements of IEC61850 conformance testing. 

1.2.1. Technical Features
1) Comprehensive support for IEC 61850
 Supports SV data input according to IEC 61850-9-1, IEC 61850-9-2, and GB/T 20840.8, as well as status input via the GOOSE protocol; flexibly supports point-to-point and networked sampling input;
 The server is modeled according to IEC61850-7-x, and the client maps the model related to customer requests. System configuration is strictly implemented according to IEC61850-6, with an independently usable configuration tool;
Supports the new generation of substation communication standard IEC 61850, with communication protocols compliant with IEC 61850-8, mapped to MMS services, providing flexible and reliable networking and remote data transmission capabilities.
2) High-reliability industrial-grade fully embedded structure:
The device adopts an embedded hardware platform and embedded software platform, fundamentally ensuring system stability and reliability;
Uses SMP multi-core processing architecture and serial bus interface hard drives, with massive data processing and storage capabilities;
Real-time software is designed and developed based on embedded concepts, using the real-time operating system RTLinux to ensure the real-time performance and stability of the device software;
Transient recording, steady-state recording, and message recording adopt identical hardware architectures;
Message acquisition is fully implemented by FPGA hardware, enabling intelligent packet assembly strategies, effectively improving the reception efficiency of processing units;
Fully implemented with FPGA circuits, resulting in low system power consumption.
3) Free combination of multiple recording methods:
Supports transient recording, steady-state recording, and message recording;
Transient recording: Triggered by startup quantities, with no less than 160 channels of selected SV sampling values combined; no less than 512 channels of selected GOOSE signals combined for switch quantities;
Steady-state recording: Continuous data recording after the device starts operation, capable of recording data for at least 7 days;
Message recording: SV network raw messages can be continuously recorded for at least 24 hours; GOOSE raw messages and MMS network raw messages can be continuously recorded for at least 14 days.
4) Backend management software can serve as an engineering station to manage multiple recording devices:
This software system can simultaneously control and manage multiple recording devices and multiple IEC 61850 logical devices, such as line recording and main transformer recording, reducing user training costs.
5) Powerful offline analysis software:
Graphical interface design, capable of running on Linux or Windows 2000 and above operating system platforms, with a powerful online help system for user convenience;
Features editing and roaming functions, providing analysis tools such as waveform display, superposition, combination, comparison, clipping, and annotation, with selective printing and print preview;
 Supports harmonic analysis, sequence quantity analysis, vector analysis, frequency analysis, power analysis, over-excitation analysis, differential current analysis, impedance diagram analysis, and displays impedance change trajectories;Features virtual channel analysis;Supports automatic fault data analysis and manual advanced analysis, generating fault reports in XML format, with detailed and clear fault analysis output results; Features relay protection characteristic analysis and switch status change sequence analysis.

6) Supports mixed access of digital and traditional quantities
Acquisition units can be inserted with analog or switch quantity boards, enabling mixed access of SV and GOOSE digital signals with conventional analog and switch quantities.
7) High-precision sampling timestamp:
 Each frame of data carries an independent absolute timestamp. Due to the use of high-precision time synchronization technology, the time accuracy error of each sampling point is <1us, which can be used for synchronized phasor measurement and improving dual-end fault location accuracy.
8) GPS high-precision time synchronization:
 Supports multiple time synchronization methods such as IRIG-B and SNTP, with IRIG-B synchronization error not exceeding ±1μs.
9) Unique data recording format:
For mid-term state data (Segment C) after major system disturbances and dynamic process data (Segment D), traditional recording methods only record RMS values. This device uses fundamental phasor values (real + imaginary parts) for analog channel recording, enabling rich dynamic analysis functions, such as outputting RMS values, phase, active power, reactive power, and differential current; it also supports phasor analysis, sequence quantity analysis, impedance analysis, and frequency analysis.
10) Long pre-fault recording time:
Traditional fault recording methods record 0.1s before a fault. This device adds an A2 segment before the fault, recording the state of electrical quantities for an extended period using fundamental phasor values (real + imaginary parts), which can be set to a maximum of 10 seconds, aiding in the analysis of slowly evolving faults.
11) Lossless compression recording storage
Efficient real-time lossless data compression technology, custom message data file storage format (DGR format), with SV network message data compression ratio greater than 9.