The invention discloses a clock synchronization method of network sampling intelligent substation, wherein double master clock redundancy backups are used; the master clock is composed of a master clock A and a master clock B; an extended clock is composed of clock 1 to clock n; all extended clocks uniformly select the master clock A as the default time source, and then are uniformly switched to the standby master clock B when the master clock A becomes invalid. The invention solves the problems of intelligent substation synchronization system, puts forward a comprehensive solution for the clock synchronization system of network sampling intelligent substation, puts forward a combination mode of clock sources of the intelligent substation time synchronization system, and puts forward a way to track the satellite time and a seamless switching strategy between a GPS time source and a Beidou time source, greatly optimizes an abnormal fault tree structure of the intelligent substation time synchronization and protection malfunction fault tree structure caused by abnormal time synchronization, and can effectively improve the stability and reliability of the time synchronization system of intelligent substation.

Clock synchronization method of network sampling intelligent substation

The invention provides a terminal system time updating method and device, and electronic equipment. The terminal system time updating method comprises the following steps: receiving a system time updating instruction, and confirming a target time source with the highest credibility in the currently available time sources; judging whether the credibility of the target time source is greater than the credibility of the time source used by the system time or not; and if so, updating the time source of the system time to the target time source, so that the time indicated by the target time source is used as the current system time. Therefore, the system time does not change with the change of the time taken by the television at random, on the contrary, the time with lower accuracy jumps to the time with higher accuracy; and when the system time is more accurate, the system time is not replaced by a low accuracy time, therefore, the stability of the television system time is improved.

Terminal system time updating method and device, and electronic equipment

A hand-held time synchronization tester is provided. The hand-held time synchronization tester comprises a signal pre processing unit, a protocol receiving inspection unit, a main control unit, a measuring unit and a man-machine interface unit. The hand-held time synchronization tester also comprises a PPS/PPM/PPH pulse signal decoding unit, an IRIG-B (AC/DC) TTL/422 time signal decoding unit, an RS232/485 time frequency signal decoding unit, a timed equipment alarm information decoding unit, and a controllable synchronization signal output and message automatic analysis unit. According to the hand-held time synchronization tester of the invention, integrated measurement technologies are adopted. The hand-held time synchronization tester is integrated with functions such as time and frequency standard and measurement data calculation and comparison as well as test result display, storage and output. With the hand-held time synchronization tester adopted, integrated test items including PPS/PPM/PPH accuracy, second pulse rising edge, serial port data accuracy, pulse signal accuracy, IRIG-series time message accuracy, serial protocol format correctness, PTP and NTP/SNTP synchronization accuracy, serial port time tick message transmitting delay measurement and the like can be completed. The hand-held time synchronization tester of the invention is applicable to field time synchronization tests of intelligent substations.

Hand-held time synchronization tester

The invention discloses a relay protection action delay time grading test system and method on the basis of Rogowski coil transient simulation. The system comprises an upper computer and a test host computer; the upper computer is provided with a data source generating module and a delay time test module; the test host computer comprises a master controller, a data generating module, a data acquisition module, a D/A module, an A/D module and an acquisition interface module. According to the system and method, firstly, a transient simulation model of the Rogowski coil under electrical power system failure conditions is established by the data source generating module, and then transient simulation data is sent to the test host computer in real time; differential small analog quantity signals are sent to a collector through the data generating module and the D/A module to establish whole interval dynamic analog data; at the same time, the small analog quantity signals are used as a standard source, and then serial data signals, merged unit 9-2 data, digital relay protected GOOSE data and intelligent terminal switching values are collected, and therefore, a whole set of test system is established; a delay time of those signals relative to the transient standard source and an overall action delay time can be tested.

Relay protection action delay time grading test system and method

The invention discloses a system and method for analyzing the transient characteristics of an electronic current transformer, and the system comprises a transient simulation signal transmission system, a verified electronic current transformer, a standard current transformer, and a transient characteristic verification system. The transient characteristic verification system comprises a response signal collection unit, a response signal A/D conversion unit, and a response signal verification unit, wherein the response signal collection unit, the response signal A/D conversion unit and the response signal verification unit are sequentially in electrical connection. The transient simulation signal transmission system transmits signals for simulating various types of faults of the verified electronic current transformer in actual use, and the signals are outputted as response signals of the verified electronic current transformer and the standard current transformer after being responded by the verified electronic current transformer and the standard current transformer. The response signals are collected by the response signal collection unit, and then are compared with an output value of the standard current transformer, thereby obtaining a verification conclusion. The above system employs the virtual technology for modeling, achieves a purpose of verifying the transient characteristics of any electronic current transformer, and provides great theoretical significance for the research of the transmission characteristics of the electronic current transformer and the impact of relay protection of the electronic current transformer.

System and method for analyzing transient characteristics of electronic current transformer

Intelligent substation clock synchronization reliability method capable of improving network sampling

The invention discloses a transient characteristic test system of a mutual inductor based on digital simulation of a Rogowski coil. The system comprises a signal conditioning module, an optical fiber sending module, an optical fiber Ethernet module, a digital analog converter, an FPGA (Field Programmable Gate Array), a POWERPC, a crystal oscillator, a human-computer interface and a storage module, wherein the crystal oscillator is connected with the FPGA and the POWERPC, the FPGA is connected with the digital analog converter, the optical fiber sending module, the optical fiber Ethernet module and the POWERPC, the POWERPC is connected with the storage module and the human-computer interface, and the digital analog converter is connected with the signal conditioning module. The FPGA comprises a synchronization module, a data receiving module and a DAC (Digital-to-Analog Converter) control module. The POWERPC comprises a digital simulation model module of the Rogowski coil, a parameter configuration module, a test data processing module and a transient characteristic analyzing module. Based on an ideal Rogowski coil model, a differential signal output is established for all-digital simulation test to be not limited in individual professional laboratories. Advantages of hardware integration and software integration can be compared, and all-around simulation test of transient characteristics of the electronic mutual inductor can be realized.

Transient characteristic test system and method of mutual inductor based on digital simulation of Rogowski coil

High-accuracy synchronous system detection device applied to intelligent transformer substation

The utility model relates to a time characteristic examining apparatus for an intelligent transformer station. The time characteristic examining apparatus comprises an access unit, a characteristic examining unit, a controllable signal output unit. The access unit and the controllable signal output unit are connected with the characteristic examining unit. The access unit is used for accessing an external time reference and using the external time reference as a time reference. The characteristic testing unit receives and examines the characteristic of a signal synchronizing signal of the intelligent transformer station, and analyzes and performs statistic on important indexes. The controllable signal output unit controllably outputs the characteristic and content of the time synchronizing signal or manually outputs a required characteristic signal. The time characteristic examining apparatus analyzes and performs statistic on the time synchronizing signal of the intelligent transformer station by using the accessed signal reference signal as a reference, provides a reliable basis for transformer station data synchronization abnormality and fault maintenance, debugging, and regular examination, shortens overhaul time, and outputs a controllable time signal to verify the abnormal response characteristics of various apparatus in the transformer station and have a key effect on power grid fault prevention.

Time characteristic examining apparatus for intelligent transformer station

The utility model discloses a mutual inductor transient characteristic testing device based on Rogowski coil digital simulation, characterized by comprising a signal conditioning module (1), a fiber sending module (2), a fiber ethernet module (3), a digital analog converter (4), a synchronous module (5), a data receiving module (6), a Rogowski coil digit simulation module (8), a crystal oscillator (7), a storage module (9), a control module (10), a human-computer interface (11) and an output interface (12); the Rogowski coil digit simulation module (8), the digital analog converter (4) and the signal conditioning module (1) are successively in connection with an output simulation signal standard source. The Rogowski coil digit simulation module (8) is in connection with the fiber sending module (2) to output a data signal standard source. The mutual inductor transient characteristic testing device tests transient characteristics of an electronic mutual inductor under the condition of not generating heavy current, and collects transient characteristics data of separating a gatherer and a merging unit of the electronic mutual inductor.

Gao Jipu

Papers

Intelligent substation clock synchronization reliability method capable of improving network sampling

Transient characteristic test system and method of mutual inductor based on digital simulation of Rogowski coil

High-accuracy synchronous system detection device applied to intelligent transformer substation

Time characteristic examining apparatus for intelligent transformer station

Mutual inductor transient characteristic testing device based on Rogowski coil digital simulation