A time frequency remote measurement transmission terminal and method for electric energy metering device

Abstract

The present invention provides a time frequency remote transmission terminal and method for an electric energy metering device, the terminal comprising: a provincial time frequency reference standard module, providing a provincial time frequency reference standard; a prefecture-level common viewing device, tracing the provincial time frequency reference standard to the local area through a network using a satellite common viewing method; transmitting the local time frequency reference standard to the time frequency remote transmission terminal through an optical fiber; the time frequency remote transmission terminal generates a standard time frequency reference signal required by the electric energy metering device, and transmits the standard time frequency reference signal to the electric energy metering device through a cable. The present invention solves the technical problems that prefecture-level time synchronization equipment has no time synchronization capability, calibration consumes a lot of manpower and material resources, the clock source loss rate is high, and on-site calibration is subject to environmental interference, resulting in poor detection accuracy of the electric energy metering device.

Description

Technical Field

[0001] The present invention relates to the field of time and frequency synchronization, and in particular to a time and frequency remote measurement transmission terminal and method for an electric energy metering device. Background Art

[0002] In the current power system, the time and frequency reference of various types of electric energy meter detection devices directly uses crystal oscillators as the reference. This reference cannot be traced back to the reference time and frequency of the upper level in real time, and there is aging, and it does not have the ability to provide time. At the same time, the metering system time of the electric energy meter is not unified, and a lot of manpower and material resources are consumed during the calibration process, which also increases the loss of the clock source. The above phenomenon is common in the electric energy metering institutions at the prefecture level. In the power system, the electric energy metering device is a tool for realizing electric energy metering, and its accuracy depends on the internal time and frequency reference.

[0003] The current municipal-level electric energy metering devices face the following problems. On the one hand, the time and frequency reference standards of municipal-level electric energy metering devices are not unified. Due to the lack of a unified specification and standard system, electric energy metering devices in different regions and from different manufacturers use different time and frequency references, resulting in differences in metering results and uncertainty in the accuracy of electric energy metering. On the other hand, municipal-level electric energy metering devices are difficult to trace back to the provincial-level time and frequency reference standards. It is difficult to establish an effective connection and traceability mechanism between the time and frequency reference standards at the municipal and provincial levels, making it impossible to guarantee the accuracy of municipal-level electric energy metering devices, affecting the stable operation of the power system.

[0004] At the same time, the standard clock in the traditional electric energy meter calibration device needs to be disassembled for inspection and on-site calibration, and the above method has obvious disadvantages. Disassembly for inspection and on-site calibration requires a lot of time and cost. At the same time, due to the long distance and inconvenient transportation, the calibration cycle is extended, affecting the timeliness and accuracy of electric energy metering. Secondly, the cost of on-site calibration is high. The cost of on-site calibration includes: personnel travel expenses, equipment transportation fees, and on-site operation fees, which greatly increases the cost of electric energy meter calibration. Moreover, on-site calibration is also affected by environmental factors, including: temperature, humidity, and electromagnetic interference, which will have an adverse effect on the calibration results and further reduce the accuracy of electric energy metering.

[0005] The existing invention patent application document "Power System Time Synchronization Monitoring Device" with publication number CN118282554A discloses a power system time synchronization monitoring device, including a time source input module, an online monitoring module, a data processing module, an early warning module, a universal bus, an integrated power supply system and an online interactive system; the time source input module is connected to the online monitoring module, the data processing module and the online interactive system through the universal bus, the online monitoring module is connected to the early warning module, the integrated power supply system supplies power to the time source input module, the online monitoring module, the data processing module, the early warning module and the online interactive system through the communication bus, the time source input module is used to receive an external time reference signal; process the external time reference signal, and output the time reference and synchronization signal, and also to receive the monitoring results of the online monitoring module; the online interactive system is used to display conventional interface information and menu functions; the online monitoring module is used to monitor the working status of the source input module in real time. However, the existing power system time synchronization monitoring device in the aforementioned existing scheme does not mention the reference time standard and the specific scheme for marking and tracing to the first-level time, and cannot guarantee the unification of the reference time link, nor can it ensure the accuracy of the power system monitoring operation.

[0006] The existing invention patent application document "A satellite common-view timing system and method based on Beidou" with publication number CN116382058A, the existing system includes: a satellite common-view timing module, which obtains standard time, calculates the time deviation between the current time of the substation and the standard time, and corrects the local clock according to the time deviation, and outputs the time synchronization signal and time information to the slave clock; the slave clock receives the time synchronization signal sent by the satellite common-view timing module, and outputs the time synchronization signal and time information to the timed device; a verification device, which calculates the difference between the substation clock output time and the standard time, and verifies the time synchronization of the satellite common-view timing system. Satellite common-view technology is introduced, network communication is used to interact with information and data, and common-view data transmission is completed, so as to realize high-precision time synchronization that can be traced across regions for each dispersed time synchronization system. However, the aforementioned prior art only describes the satellite common-view taming of the local clock, and does not transmit the clock signal to the terminal electric energy metering device, and the detection accuracy of the electric energy metering device still needs to be improved.

[0007] The existing invention patent application document with publication number CN105137751A, "A calibration system and calibration method for time values ​​of a metrological production scheduling platform", includes: a satellite receiver at location A, a standard cesium atomic clock at location A, a micro-leap meter at location A, a precision counter at location A, a computer data processing system at location A, a satellite receiver of a system under test at location B, an atomic clock under test at location B, a micro-leap meter of a system under test at location B, a precision counter of a system under test at location B, and a computer data processing system at location B. The aforementioned prior art describes a remote calibration method for time values ​​in a metrological production scheduling platform, and its core method is also the satellite common view method. However, the prior art cannot tame the local crystal oscillator through the satellite common view method to reproduce the standard time frequency, nor can it transmit the time and frequency values ​​to the standard clock of the time-using terminal through optical fiber. At the same time, the prior art is difficult to perform remote traceability and remote calibration through two-way transmission of optical fiber.

[0008] In summary, the existing municipal-level timing equipment has the following technical problems: it does not have the ability to provide timing, calibration consumes a lot of manpower and material resources, the clock source loss rate is high, and on-site calibration is subject to environmental interference, resulting in poor detection accuracy of electric energy metering devices. Summary of the invention

[0009] The technical problem to be solved by the present invention is: how to solve the technical problems that the existing municipal-level timing equipment has no timing capability, calibration consumes a lot of manpower and material resources, the clock source loss rate is high, and on-site calibration is subject to environmental interference, resulting in poor detection accuracy of the electric energy metering device.

[0010] The present invention adopts the following technical solution to solve the above technical problem: a time frequency remote measurement transmission terminal of an electric energy metering device comprises:

[0011] A provincial time and frequency reference standard module is used to provide a provincial time and frequency reference standard, and the provincial time and frequency reference standard module is connected to a prefecture-level common viewing device;

[0012] The prefecture-level common viewing device is used to trace the provincial time and frequency reference standard to the local area through the preset network by using the satellite common viewing method; the local time and frequency reference standard is transmitted to the time and frequency remote transmission terminal through the preset optical fiber; the prefecture-level common viewing device is connected to the time and frequency remote transmission terminal;

[0013] The time and frequency remote measurement transmission terminal is used to generate a standard time and frequency reference signal for the electric energy metering device, and transmit the standard time and frequency reference signal to the electric energy metering device through a preset cable. The time and frequency remote measurement transmission terminal is connected to the electric energy metering device;

[0014] The electric energy metering device is used to perform time and frequency remote measurement transmission operations according to standard time and frequency reference signals. The electric energy metering device is connected to the time and frequency remote measurement transmission terminal. The electric energy metering device includes: a calibration platform and a platform control computer; the calibration platform is connected to the platform control computer.

[0015] The present invention can realize the real-time traceability of the electric energy metering institutions at the prefecture level to the provincial time and frequency reference standards through the satellite common view method; the present invention can be applied to the clock synchronization of each link in the meter inspection operation of the electric energy metering system. At present, the provincial grid metering centers have established a link for remote real-time traceability of time and frequency values ​​to the national grid metering center. The present invention supplements and improves the method of establishing and transmitting the time and frequency values ​​to the next level link.

[0016] The present invention realizes the unification of the traceability link, which not only ensures the unification of the internal time and frequency reference of the electric energy metering device in the power system, but also improves the accuracy of electric energy metering; it can realize online testing and remote calibration of the electric energy metering device, improve production efficiency and greatly reduce maintenance costs.

[0017] In a more specific technical solution, the city-level common-view device includes: a common-view module and an atomic clock module; the common-view module is used to tame the atomic clock module.

[0018] In a more specific technical solution, the common view module is used to trace the local time and frequency reference standard to the provincial time and frequency reference standard through a preset network according to the following logic, using a satellite common view method, to obtain a time and frequency signal standard after tracing;

[0019]

[0020]

[0021] In the formula, is the time of clock A and clock B, in seconds; The time of BeiDou Navigation Satellite System (BDS), in seconds; Clock A and clock B are respectively i , i +1 time corresponding to the time deviation, unit is s; For the i , i +1 time interval, in seconds; is the relative frequency deviation between clock A and clock B;

[0022] The atomic clock module is used to tame the local atomic clock when the local time and frequency reference standard is traced back to the provincial time and frequency reference standard, so that the local atomic clock outputs a time and frequency signal consistent with the provincial time and frequency reference standard. The atomic clock module is connected to the common view module.

[0023] The present invention uses the satellite common view method to trace the local time and frequency reference standard of the prefecture-level city to the provincial time and frequency reference standard, and directly transmits the corresponding time and frequency to the time and frequency application terminal in real time, and can simultaneously carry out time and frequency synchronization services and metering test services. In the test bench of the electric energy meter automatic test line, the gateway electric energy meter and the standard electric energy meter, the standard clock source is replaced; at the same time, the existing standard clock source can be tested online to complete the clock quality monitoring. The present invention uses the satellite common view method to tame the local clock, and transmits the clock signal to the standard clock of the electric energy metering device through the optical fiber bidirectional transmission technology, so as to solve the real-time tracing and online monitoring problems of the standard clock of the electric energy metering device.

[0024] In a more specific technical solution, the time and frequency remote quantity transmission terminal includes: an optical fiber quantity transmission device, a time and frequency terminal device, an NTP (Network Time Protocol) network timing device and a data monitoring device; the data monitoring device is connected to the time and frequency terminal device; the optical fiber quantity transmission device is connected to the NTP network timing device and the time and frequency terminal device; the data monitoring device is connected to the optical fiber quantity transmission device;

[0025] The optical fiber transmission device obtains the time and frequency signal from the prefecture-level common viewing device and uses the following logic to process and send the 1PPS (Pulse Per Second, the number of pulses per second) and TOD (Time Of Day, the time mark of a specific time of day) timestamps to the NTP network timing device and the time and frequency terminal device according to the time and frequency signal standard after tracing.

[0026]

[0027]

[0028] In the formula, is the time deviation between clock A and clock B, in seconds; is the round trip delay of link transmission, in seconds; The first launch time, is the first receiving time, The second launch time, is the second receiving time;

[0029] The NTP network timing device processes and obtains reference 1PPS data based on 1PPS and TOD timestamps and sends it to the time and frequency terminal device;

[0030] The time-frequency terminal device processes and obtains the time difference data based on the reference 1PPS data and 1PPS and TOD timestamps and uploads it to the data monitoring device;

[0031] The data monitoring device processes the time difference data, obtains and sends the time code optical signal to the optical fiber quantity transmission transposition.

[0032] The present invention realizes remote calibration of the clock source in the electric energy metering device, and the clock source can realize online remote calibration without disassembly and inspection. The present invention establishes a time-frequency calibration link from the provincial network time-frequency laboratory to the time-frequency application terminal of the prefecture-level city, and realizes remote calibration and online testing of the electric energy meter verification device. It improves production efficiency and reduces maintenance costs.

[0033] In a more specific technical solution, the optical fiber quantity transmission device includes: a time code generator and loop monitoring module, a time code decoder module;

[0034] The time code generator and loop monitoring module are used to receive the second pulses generated by the city-level common view device, set the timestamp and frequency signal, encode the time information through the time code encoding technology, convert it into a time code optical signal, and transmit the time code optical signal to the time code decoder module; the status monitoring module processes the time difference data to obtain the accuracy monitoring data and status monitoring data to uniformly manage the electric energy metering device;

[0035] The time code decoder module receives the time code optical signal through optical fiber, decodes the time code optical signal, generates 1PPS and TOD timestamps; transmits it to the NTP network timing device and time and frequency terminal device through optical fiber and cable to provide standard time and frequency reference signals.

[0036] In the process of tracing the local time and frequency reference standard to the provincial time and frequency reference standard, the present invention adopts the satellite common view method to transfer time and frequency; the local time and frequency reference standard clock of the prefecture-level city is transferred to the fixed inspection station by optical fiber.

[0037] In a more specific technical solution, the optical fiber transmission device is used to decode the time code optical signal to obtain 1PPS and TOD timestamps, and transmit the 1PPS and TOD timestamps to the time and frequency terminal device; the time and frequency terminal device is used to transmit the standard time and frequency reference signal to the electric energy metering device according to the 1PPS and TOD timestamps as the time and frequency reference of the calibration station.

[0038] In a more specific technical solution, the time-frequency terminal device includes:

[0039] The frequency generation module generates a standard frequency through a processor and a crystal oscillator according to the 1PPS and TOD timestamps in the time code optical signal, obtains a standard time and frequency reference signal, transmits the standard time and frequency reference signal to the electric energy metering device, and provides time and frequency reference information for the electric energy metering device;

[0040] The time difference measurement module is used to measure the standard time-frequency reference signal to obtain the time difference data, wherein the reference 1PPS data output by the time-frequency terminal device is measured, and the 1PPS phase difference between the internal clock module and the external time-frequency application terminal is measured; the frequency deviation of the frequency generation module and the external time-frequency application terminal is measured, and the time difference measurement module is connected to the frequency generation module.

[0041] In a more specific technical solution, the NTP network timing device is used to perform timing and monitoring on the station control computer, process the time-frequency signal, and uniformly manage the electric energy metering device according to the time-frequency signal. The NTP network timing device also includes:

[0042] The network time generation module is used to receive the 1PPS and TOD timestamps generated by the time code decoder module, generate NTP and SNTP network protocols through the processor and preset software, set up the network time server, and provide the time synchronization signal for the station control computer;

[0043] The timestamp generation module is used to receive 1PPS and TOD timestamps, and output 1PPS and TOD timestamps to the electric energy metering device through delay compensation circuit, protocol conversion, and level conversion to provide reference time; and output reference 1PPS data to the time difference measurement module for collecting accuracy monitoring information.

[0044] In a more specific technical solution, the data monitoring device includes: a status monitoring module, which is used to obtain a time code optical signal from the time difference data measured by the time difference measurement module, and report the time code optical signal to the time code generator and the loop monitoring module through the optical fiber loop.

[0045] The monitoring and metering device of the present invention detects faulty clock application terminals in real time according to the frequency deviation and time difference data of the time and frequency application terminals. After the provincial time and frequency reference standard of the present invention transmits the time and frequency data to the fixed inspection station, it has the functions of metering test and online calibration for the standard clock in the electric energy metering device of the prefecture-level city, and is suitable for the detection and quality monitoring of the time and frequency value of the standard clock in the current power equipment.

[0046] In a more specific technical solution, a time frequency remote measurement transmission method of an electric energy metering device includes:

[0047] Use the provincial time and frequency reference standard module to provide provincial time and frequency reference standards;

[0048] Using the prefecture-level common-view device, through the preset network, the provincial time and frequency reference standard is traced back to the local area using the satellite common-view method; the local time and frequency reference standard is transmitted to the time and frequency remote transmission terminal through the preset optical fiber;

[0049] A time-frequency remote measurement transmission terminal is used to generate a standard time-frequency reference signal for an electric energy metering device, and the standard time-frequency reference signal is transmitted to the electric energy metering device through a preset cable;

[0050] Utilize electric energy metering devices to perform time and frequency remote measurement transmission operations based on standard time and frequency reference signals.

[0051] Compared with the prior art, the present invention has the following advantages:

[0052] The present invention can realize the real-time traceability of the electric energy metering institutions at the prefecture level to the provincial time and frequency reference standards through the satellite common view method; the present invention can be applied to the clock synchronization of each link in the meter inspection operation of the electric energy metering system. At present, the provincial grid metering centers have established a link for remote real-time traceability of time and frequency values ​​to the national grid metering center. The present invention supplements and improves the method of establishing and transmitting the time and frequency values ​​to the next level link.

[0053] The present invention realizes the unification of the traceability link, which not only ensures the unification of the internal time and frequency reference of the electric energy metering device in the power system, but also improves the accuracy of electric energy metering; it can realize online testing and remote calibration of the electric energy metering device, improve production efficiency and greatly reduce maintenance costs.

[0054] The present invention uses the satellite common view method to trace the local time and frequency reference standard of the prefecture-level city to the provincial time and frequency reference standard, and directly transmits the corresponding time and frequency to the time and frequency application terminal in real time, and can simultaneously carry out time and frequency synchronization services and metering test services. In the test bench of the electric energy meter automatic test line, the gateway electric energy meter and the standard electric energy meter, the standard clock source is replaced; at the same time, the existing standard clock source can be tested online to complete the clock quality monitoring. The present invention uses the satellite common view method to tame the local clock, and transmits the clock signal to the standard clock of the electric energy metering device through the optical fiber bidirectional transmission technology, so as to solve the real-time tracing and online monitoring problems of the standard clock of the electric energy metering device.

[0055] The present invention realizes remote calibration of the clock source in the electric energy metering device, and the clock source can realize online remote calibration without disassembly and inspection. The present invention establishes a time-frequency calibration link from the provincial network time-frequency laboratory to the time-frequency application terminal of the prefecture-level city, and realizes remote calibration and online testing of the electric energy meter verification device. It improves production efficiency and reduces maintenance costs.

[0056] In the process of tracing the local time and frequency reference standard to the provincial time and frequency reference standard, the present invention adopts the satellite common view method to transfer time and frequency; the local time and frequency reference standard clock of the prefecture-level city is transferred to the fixed inspection station by optical fiber.

[0057] The monitoring and metering device of the present invention detects faulty clock application terminals in real time according to the frequency deviation and time difference data of the time and frequency application terminals. After the provincial time and frequency reference standard of the present invention transmits the time and frequency data to the fixed inspection station, it has the functions of metering test and online calibration for the standard clock in the electric energy metering device of the prefecture-level city, and is suitable for the detection and quality monitoring of the time and frequency value of the standard clock in the current power equipment.

[0058] The invention solves the technical problems that the existing municipal-level timing equipment has no timing capability, calibration consumes a lot of manpower and material resources, the clock source loss rate is high, and on-site calibration is subject to environmental interference, resulting in poor detection accuracy of the electric energy metering device. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of a basic module of a time and frequency remote measurement transmission terminal of an electric energy metering device according to Embodiment 1 of the present invention;

[0060] Figure 2 This is a schematic diagram of a detailed submodule of a time and frequency remote measurement transmission terminal of an electric energy metering device according to embodiment 1 of the present invention;

[0061] Figure 3 This is a schematic diagram of the satellite common viewing principle of Example 1 of the present invention;

[0062] Figure 4 This is a schematic diagram of the principle of optical fiber time-frequency transmission according to Embodiment 1 of the present invention;

[0063] Figure 5 A schematic diagram of basic steps of a time and frequency remote measurement transmission method for an electric energy metering device according to Embodiment 2 of the present invention;

[0064] Figure 6 This is a schematic diagram of an application scenario of a time and frequency remote measurement transmission method of an electric energy metering device according to Embodiment 2 of the present invention in an electric energy meter testing station. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] Example 1

[0067] like Figure 1 and Figure 2 As shown, a time and frequency remote measurement transmission terminal of an electric energy metering device includes the following basic modules:

[0068] A provincial time and frequency reference standard module 1 is used to provide a provincial time and frequency reference standard, and the provincial time and frequency reference standard module 1 is connected to a prefecture-level co-viewing device 2;

[0069] In this embodiment, the connection method between the provincial time and frequency reference standard module 1 and the prefecture-level common viewing device 2 includes but is not limited to: a satellite common viewing network.

[0070] The prefecture-level common viewing device 2 is used to trace the provincial time and frequency reference standard to the local area through the preset network by using the satellite common viewing method; the local time and frequency reference standard is transmitted to the time and frequency remote transmission terminal through the preset optical fiber; the prefecture-level common viewing device 2 is connected to the time and frequency remote transmission terminal 3;

[0071] The prefecture-level common-view device 2 includes: a common-view module 21 and an atomic clock module 22 ; the common-view module 21 is used to perform a taming operation on the atomic clock module 22 .

[0072] In this embodiment, the common viewing module 21 uses a satellite common viewing method to trace the local time and frequency reference standard to the provincial network time and frequency reference standard through a satellite common viewing network. The atomic clock module 22 traces back to the provincial network time and frequency reference standard, tames the local atomic clock, and makes the local atomic clock output a time and frequency reference signal consistent with the provincial network time and frequency reference standard.

[0073] In the satellite common-view time transfer process adopted in this embodiment, for example, the signal of a GNSS (Global Navigation Satellite System) satellite can be used as a common resource. Users in two locations measure the time difference between the local clock and the same satellite clock at the same time, and the clock deviations of the two locations are calculated by comparing the observation results of the two locations.

[0074] like Figure 3As shown, in this embodiment, the common view module 21 is used to trace the local time and frequency reference standard to the provincial time and frequency reference standard through a preset network according to the following logic, using a satellite common view method, to obtain a time and frequency signal standard after tracing. Specifically, in the principle of the common view method, the clocks located at AB are respectively connected to satellite common view receivers, and the satellite common view receiver calculates the deviation of clock A, clock B and satellite time at the same time through pseudo-range observations. Through data interaction, the time deviation is subtracted to obtain the time deviation of clock A and clock B. :

[0075]

[0076] By time deviation within a preset time , calculate the relative frequency deviation of clock A and clock B , see Figure 3 Then according to the relative frequency deviation Adjusting clock B can lock clock B to clock A, remotely reproduce the time and frequency of clock A, and realize remote transmission of time and frequency values:

[0077]

[0078] in, is the time of clock A and clock B, in seconds; Navigation Satellite System BDS The moment, in s; Clock A and clock B are respectively i , i +1 time corresponding to the time deviation, unit is s; For the i , i +1 time interval, in seconds; is the relative frequency deviation between clock A and clock B;

[0079] The atomic clock module 22 is used to tame the local atomic clock when the local time and frequency reference standard is traced back to the provincial time and frequency reference standard, so that the local atomic clock outputs a time and frequency signal consistent with the provincial time and frequency reference standard. The atomic clock module 22 is connected to the common view module 21.

[0080] The time and frequency remote transmission terminal 3 is used to generate a standard time and frequency reference signal for the electric energy metering device, and transmit the standard time and frequency reference signal to the electric energy metering device through a preset cable. The time and frequency remote transmission terminal 3 is connected to the electric energy metering device 4;

[0081] See also Figure 2In this embodiment, the time and frequency remote quantity transmission terminal 3 includes: an optical fiber quantity transmission device 31, a time and frequency terminal device 32, an NTP network timing device 33 and a data monitoring device 34; the data monitoring device 34 is connected to the time and frequency terminal device 32; the optical fiber quantity transmission device 31 is connected to the NTP network timing device 33 and the time and frequency terminal device 32; the data monitoring device 34 is connected to the optical fiber quantity transmission device 31;

[0082] The optical fiber transmission device 31 obtains the time and frequency signal from the prefecture-level common viewing device 2 and processes it according to the time and frequency signal standard after tracing the source, and uses the following logic to obtain and send the 1PPS and TOD timestamps to the NTP network timing device 33 and the time and frequency terminal device 32; specifically, in the optical fiber time and frequency transmission process, by modulating the time signal onto the carrier, bidirectionally transmitting through the optical fiber, and eliminating the link delay, the time deviation of the clocks of the two places can be obtained, so as to achieve the purpose of remote transmission and calibration of time and frequency. For details, see Figure 4 . The first modulation and demodulation module A is used to modulate the first transmission time T1 of clock A onto the carrier, and transmits it to the second modulation and demodulation module B through the optical fiber, and records the first receiving time T2; the modulation and demodulation module B transmits the time information of the first transmission time T1, the first receiving time T2 and the second transmission time T3 to the modulation and demodulation module A, and records the second receiving time T4. The time deviation between clock A and clock B is calculated according to the following formula based on the first transmission time T1, the first receiving time T2, the second transmission time T3 and the second receiving time T4, and remote transmission and calibration are realized based on the time deviation:

[0083]

[0084]

[0085] in, is the time deviation between clock A and clock B, in seconds; is the round trip delay of link transmission, in seconds; The first launch time, is the first receiving time, The second launch time, is the second receiving time;

[0086] The NTP network timing device 33 processes and obtains reference 1PPS data according to 1PPS and TOD timestamps and sends the reference 1PPS data to the time and frequency terminal device 32;

[0087] The time-frequency terminal device 32 processes and obtains the time difference data based on the reference 1PPS data and the 1PPS and TOD timestamps and uploads it to the data monitoring device 34;

[0088] The data monitoring device 34 processes the time difference data to obtain and send the time code optical signal to the optical fiber data transmission device 31 .

[0089] In this embodiment, a time code optical signal Time code signal is used to determine a binary coded signal of time information of a frame reference mark. Specifically, the units of the aforementioned time information include but are not limited to: year, month, day, hour, minute and second.

[0090] The optical fiber data transmission device 31 includes: a time code generator and loop monitoring module 311, a time code decoder module 312;

[0091] The time code generator and loop monitoring module 311 is used to receive the second pulse generated by the city-level common viewing device, set the timestamp and frequency signal, encode the time information through the time code encoding technology, convert it into a time code optical signal, and transmit the time code optical signal to the time code decoder module 312; the state monitoring module 341 processes the time difference data to obtain the accuracy monitoring data and the state monitoring data, so as to uniformly manage the electric energy metering device 4;

[0092] The time code decoder module 312 receives the time code optical signal through optical fiber, decodes the time code optical signal, generates 1PPS and TOD timestamps, and transmits them to the NTP network timing device 33 and the time and frequency terminal device 32 through optical fiber and cable to provide a standard time and frequency reference signal.

[0093] The optical fiber transmission device 31 is used to decode the time code optical signal to obtain 1PPS and TOD timestamps, and transmit the 1PPS and TOD timestamps to the time and frequency terminal device 32; the time and frequency terminal device 32 is used to transmit the standard time and frequency reference signal to the electric energy metering device 4 according to the 1PPS and TOD timestamps as the time and frequency reference of the calibration station 41.

[0094] In this embodiment, the time code generator and loop monitoring module 311 sets 1PPS, TOD timestamp and frequency signal by receiving the second pulse generated by the city-level common viewing device 2 after tracing. Specifically, the frequency signal can be set to, for example, 10MHz. Through the time code encoding technology, the time information is encoded and then converted into a time code optical signal for transmission to the time code decoder module 312. At the same time, the accuracy monitoring data and status monitoring data output by the status monitoring module are received for unified management of the aforementioned electric energy metering device 4.

[0095] The time code decoder module 312 receives the time code optical signal from the time code generator and the loop monitoring module 311 through optical fiber, decodes it, generates 1PPS and TOD timestamps, and then transmits them to the network time generation module 332, the frequency generation module 321, the timestamp generation module 332 and the time difference measurement module 322 through optical fiber or cable to provide them with a standard reference time signal.

[0096] The time-frequency terminal device 32 includes:

[0097] The frequency generation module 322 generates a standard frequency through a processor and a crystal oscillator according to the 1PPS and TOD timestamps in the time code optical signal, obtains a standard time-frequency reference signal, transmits the standard time-frequency reference signal to the electric energy metering device 4, and provides time-frequency reference information for the electric energy metering device 4;

[0098] In this embodiment, the time code optical signal input by the optical fiber transmission device 31 generates a standard frequency through a processor and a crystal oscillator circuit. The standard frequency can be set to, for example, 100KHz or 500KHz. The standard time and frequency reference signal is transmitted to the electric energy metering device 4 to provide a standard time and frequency reference for the electric energy metering equipment.

[0099] The time difference measurement module 321 is used to measure the standard time-frequency reference signal to obtain the time difference data, wherein the reference 1PPS data output by the time-frequency terminal device 32 is measured, and the 1PPS phase difference between the internal clock module and the external time-frequency application terminal; the frequency deviation of the frequency generation module 322 and the external time-frequency application terminal is measured, and the time difference measurement module 321 is connected to the frequency generation module 322.

[0100] In the optical fiber time and frequency transfer process adopted in this embodiment, optical fiber is used as a transmission medium to perform time and frequency transfer.

[0101] In this embodiment, the time difference measurement module 322 measures the phase difference between the reference 1PPS output by the time-frequency terminal device 32 and the 1PPS of the internal clock module or the external time-frequency application terminal; measures the frequency deviation of 100KHz and 500KHz of the frequency signal generating module or the external time-frequency application terminal. And transmits the status and measurement results to data monitoring.

[0102] The NTP network timing device 33 is used to perform timing and monitoring on the station control computer, process the obtained time-frequency signals, and uniformly manage the electric energy metering devices according to the time-frequency signals.

[0103] The NTP network timing device 33 also includes:

[0104] The network time generation module 331 is used to receive the 1PPS and TOD timestamps generated by the time code decoder module 312, generate NTP and SNTP network protocols through the processor and preset software, set up a network time server, and provide a time synchronization signal for the station control computer 42;

[0105] In this embodiment, the NTP network time protocol (network time protocol), a protocol defined by the RFC (Request For Comments)-1305 standard, is used for time synchronization between a group of distributed time servers and clients. SNTP (Simple Network Time Protocol) is a simplified protocol of NTP.

[0106] The timestamp generation module 332 is used to receive 1PPS and TOD timestamps, and output 1PPS and TOD timestamps to the electric energy metering device 4 through delay compensation circuit, protocol conversion, and level conversion to provide reference time; and output reference 1PPS data to the time difference measurement module 321 for collecting accuracy monitoring information.

[0107] In this embodiment, TOD (Time Of Day) indicates a time mark of a specific time of a day. The representation form of TOD includes but is not limited to: hour, minute, and second.

[0108] The data monitoring device 34 includes: a state monitoring module 341 for obtaining a time code optical signal from the time difference data measured by the time difference measurement module 321, and reporting the time code optical signal to the time code generator and the loop monitoring module 311 through an optical fiber loop.

[0109] In this embodiment, the prefecture-level common-view device 3 traces back to the provincial time and frequency reference standard through the satellite common-view method, and transmits the traced time and frequency signal standard to the optical fiber transmission device 31 and the NTP network timing device 33 as the standard time and frequency reference signal. The optical fiber transmission device 31 transmits the decoded time code optical signal to the time and frequency terminal device 32, and the time and frequency terminal device 32 transmits the generated frequency signal to the electric energy metering device 4 as the time and frequency reference of the calibration station 41. At the same time, the NTP network timing device 32 also performs time and monitoring on the station control computer 42 in the electric energy metering device. The time difference measurement module measures the frequency signal generated by each time and frequency terminal device 32, uploads the time difference data to the status monitoring module 341, and uploads the status monitoring data and accuracy monitoring data obtained by monitoring to the time code generator and loop monitoring module 311 for unified management.

[0110] In this embodiment, the working principles of the time and frequency remote measurement transmission terminal 3 include: satellite common view principle and optical fiber measurement transmission principle; the time and frequency remote measurement transmission terminal 3 adopts the satellite common view principle to realize real-time comparison with the previous level time reference, and by obtaining the comparison result of the time difference data, the internal atomic clock is corrected for phase and frequency difference, thereby generating a time and frequency signal consistent with the previous level standard time and frequency reference signal, and then transmitting the time and frequency signal to the optical fiber measurement transmission device 31.

[0111] The aforementioned fiber optic quantity transmission principle belongs to the time and frequency transmission technology, which uses optical fiber as the transmission medium, and realizes the long-distance transmission and synchronization of time and frequency signals through signal encoding and modulation, optical fiber transmission, signal reception and demodulation, and time and frequency synchronization. The fiber optic quantity transmission device 31 encodes and modulates the received time and frequency signals, converts the electrical signals into time code optical signals, and transmits them through optical fiber to the electric energy metering devices 4 that require time reference.

[0112] The electric energy metering device 4 is used to perform time and frequency remote measurement transmission operations according to the standard time and frequency reference signal. The electric energy metering device 4 is connected to the time and frequency remote measurement transmission terminal 3; the electric energy metering device 4 includes: a calibration platform 41 and a platform control computer 42; the calibration platform 41 is connected to the platform control computer 42.

[0113] Example 2

[0114] like Figure 5 As shown, in this embodiment, a time frequency remote measurement transmission method of an electric energy metering device includes the following basic steps:

[0115] S1. Use provincial time and frequency reference standard module 1 to provide provincial time and frequency reference standards;

[0116] S2, using the prefecture-level common viewing device 2, through the preset network, using the satellite common viewing method to trace the provincial time and frequency reference standard to the local area; through the preset optical fiber, the local time and frequency reference standard is transmitted to the time and frequency remote transmission terminal 3;

[0117] S3, using the time and frequency remote measurement transmission terminal 3 to generate a standard time and frequency reference signal of the electric energy metering device, and transmitting the standard time and frequency reference signal to the electric energy metering device 4 through a preset cable;

[0118] S4. Using the electric energy metering device 4, according to the standard time and frequency reference signal, remote time and frequency measurement transmission operation is performed.

[0119] like Figure 6 As shown, in this embodiment, the application objects of a time and frequency remote measurement transmission method for an electric energy metering device include but are not limited to: a metering mechanism test line of a prefecture-level city electric energy meter, a standard electric energy meter and an ordinary electric energy meter.

[0120] In this embodiment, the prefecture-level city electric energy metering system is used as a node, and the prefecture-level common viewing device 2 can use, for example, the Beidou satellite common viewing method to trace back to the provincial time and frequency reference standard through the satellite common viewing network. After the prefecture-level common viewing device 2 traces back to the source, the time and frequency reference standard is transmitted to the time and frequency remote transmission terminal 3 through optical fiber. The time and frequency remote transmission terminal 3 performs optical fiber loop data verification through a processor and an electronic circuit, and transmits the time and frequency value in the standard time and frequency reference signal to the first electric energy metering device, the second electric energy metering device to the nth electric energy metering device in the electric energy metering device 4 in real time. Specifically, the time and frequency remote transmission terminal 3 performs NTP network time synchronization on the electric energy metering device 4, provides a time synchronization signal for the computer control system of the electric energy metering device, and the computer control system of the electric energy metering device controls the clock source status of the first electric energy metering device, the second electric energy metering device to the nth electric energy metering device; the time and frequency remote transmission terminal 3 collects NTP timing data and performs NTP data monitoring. The time and frequency remote measurement transmission terminal 3 transmits the aforementioned time and frequency values ​​to each electric energy metering device 4 in real time, and uploads the accuracy monitoring data and status monitoring data of the standard clock source in the electric energy metering device 4 to the time and frequency remote measurement transmission terminal 3 to form a unified management. Through the time and frequency remote measurement transmission terminal 3, the frequency characteristics of the existing standard clock source are calibrated online in real time. Specifically, the aforementioned frequency characteristics include but are not limited to: relative frequency deviation and daily time error.

[0121] The solution in this embodiment can be applied to the renovation and new construction of the standard clock source for electric energy meter detection, and can complete the remote real-time traceability operation of time and frequency, online measurement and calibration of time and frequency parameters, and monitoring operation.

[0122] In this embodiment, the satellite common view system at the municipal level is remotely calibrated in accordance with the "JJF 1206-2018 Time and Frequency Standard Remote Calibration Specification" to improve the calibration accuracy and efficiency of the electric energy metering device 4.

[0123] In summary, the present invention can realize the real-time traceability of the electric energy metering institutions at the prefecture level to the provincial time and frequency reference standards through the satellite common view method; the present invention can be applied to the clock synchronization of each link in the meter inspection operation of the electric energy metering system. At present, the provincial grid metering centers have established a link for remote real-time traceability of time and frequency values ​​to the national grid metering center. The present invention supplements and improves the method of establishing and transmitting the time and frequency values ​​to the next level link.

[0124] The present invention realizes the unification of the traceability link, which not only ensures the unification of the internal time and frequency reference of the electric energy metering device in the power system, but also improves the accuracy of electric energy metering; it can realize online testing and remote calibration of the electric energy metering device, improve production efficiency and greatly reduce maintenance costs.

[0125] The present invention uses the satellite common view method to trace the local time and frequency reference standard of the prefecture-level city to the provincial time and frequency reference standard, and directly transmits the corresponding time and frequency to the time and frequency application terminal in real time, and can simultaneously carry out time and frequency synchronization services and metering test services. In the test bench of the electric energy meter automatic test line, the gateway electric energy meter and the standard electric energy meter, the standard clock source is replaced; at the same time, the existing standard clock source can be tested online to complete the clock quality monitoring. The present invention uses the satellite common view method to tame the local clock, and transmits the clock signal to the standard clock of the electric energy metering device through the optical fiber bidirectional transmission technology, so as to solve the real-time tracing and online monitoring problems of the standard clock of the electric energy metering device.

[0126] The present invention realizes remote calibration of the clock source in the electric energy metering device, and the clock source can realize online remote calibration without disassembly and inspection. The present invention establishes a time-frequency calibration link from the provincial network time-frequency laboratory to the time-frequency application terminal of the prefecture-level city, and realizes remote calibration and online testing of the electric energy meter verification device. It improves production efficiency and reduces maintenance costs.

[0127] In the process of tracing the local time and frequency reference standard to the provincial time and frequency reference standard, the present invention adopts the satellite common view method to transfer time and frequency; the local time and frequency reference standard clock of the prefecture-level city is transferred to the fixed inspection station by optical fiber.

[0128] The monitoring and metering device of the present invention detects faulty clock application terminals in real time according to the frequency deviation and time difference data of the time and frequency application terminals. After the provincial time and frequency reference standard of the present invention transmits the time and frequency data to the fixed inspection station, it has the functions of metering test and online calibration for the standard clock in the electric energy metering device of the prefecture-level city, and is suitable for the detection and quality monitoring of the time and frequency value of the standard clock in the current power equipment.

[0129] The invention solves the technical problems that the existing municipal-level timing equipment has no timing capability, calibration consumes a lot of manpower and material resources, the clock source loss rate is high, and on-site calibration is subject to environmental interference, resulting in poor detection accuracy of the electric energy metering device.

[0130] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A time and frequency remote measurement transmission terminal for an electric energy metering device, characterized in that: The terminal comprises: A provincial time and frequency reference standard module is used to provide a provincial time and frequency reference standard, and the provincial time and frequency reference standard module is connected to a prefecture-level common viewing device; The prefecture-level common viewing device is used to trace the provincial time and frequency reference standard to the local area through a preset network using a satellite common viewing method; transmit the local time and frequency reference standard to the time and frequency remote transmission terminal through a preset optical fiber; the prefecture-level common viewing device is connected to the time and frequency remote transmission terminal; The time and frequency remote quantity transmission terminal is used to generate a standard time and frequency reference signal of the electric energy metering device, and transmit the standard time and frequency reference signal to the electric energy metering device through a preset cable. The time and frequency remote quantity transmission terminal is connected to the electric energy metering device; the time and frequency remote quantity transmission terminal includes: an optical fiber quantity transmission device, a time and frequency terminal device, an NTP network timing device and a data monitoring device; the data monitoring device is connected to the time and frequency terminal device; the optical fiber quantity transmission device is connected to the NTP network timing device and the time and frequency terminal device; the data monitoring device is connected to the optical fiber quantity transmission device; The electric energy metering device is used to perform time and frequency remote measurement transmission operations according to the standard time and frequency reference signal, and the electric energy metering device is connected to the time and frequency remote measurement transmission terminal; the electric energy metering device includes: a calibration platform and a platform control computer; the calibration platform is connected to the platform control computer.

2. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 1, characterized in that: The prefecture-level common-view device comprises: a common-view module and an atomic clock module; the common-view module is used to perform a taming operation on the atomic clock module; The common-view module is used to trace the local time and frequency reference standard to the provincial time and frequency reference standard through the preset network according to the following logic, using the satellite common-view method, to obtain the traced time and frequency signal standard: In the formula, is the time of clock A and clock B; Navigation Satellite System BDS moment; The clock A and the clock B are respectively i , i +1 time deviation corresponding to the moment; For the i , i +1 time interval; is the relative frequency deviation between the clock A and the clock B.

3. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 2, characterized in that: The atomic clock module is used to tame the local atomic clock when the local time and frequency reference standard is traced back to the provincial time and frequency reference standard, so that the local atomic clock outputs a time and frequency signal consistent with the provincial time and frequency reference standard. The atomic clock module is connected to the common view module.

4. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 1, characterized in that: The optical fiber data transmission device obtains the time and frequency signal from the prefecture-level common viewing device and processes and sends the 1PPS and TOD timestamps to the NTP network timing device and the time and frequency terminal device according to the time and frequency signal standard after tracing the source using the following logic: In the formula, is the time deviation between clock A and clock B; is the round trip delay of link transmission; The first launch time, is the first receiving time, The second launch time, is the second receiving time; The NTP network timing device processes and obtains reference 1PPS data according to the 1PPS and TOD timestamps and sends the reference 1PPS data to the time and frequency terminal device; The time-frequency terminal device processes and obtains the time difference data according to the reference 1PPS data and the 1PPS and TOD timestamps and uploads the time difference data to the data monitoring device; The data monitoring device processes the time difference data to obtain and send a time code optical signal to the optical fiber data transmission device.

5. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 4, characterized in that: The optical fiber data transmission device includes: a time code generator and a loop monitoring module, and a time code decoder module; The time code generator and loop monitoring module are used to receive the second pulse generated by the city-level common view device, set the timestamp and frequency signal, encode the time information through the time code encoding technology, convert it into a time code optical signal, and transmit the time code optical signal to the time code decoder module; the status monitoring module processes the time difference data to obtain the accuracy monitoring data and the status monitoring data, so as to uniformly manage the electric energy metering device; The time code decoder module receives the time code optical signal through optical fiber, decodes the time code optical signal, generates the 1PPS and TOD timestamps; transmits them to the NTP network timing device and the time and frequency terminal device through optical fiber and cable to provide the standard time and frequency reference signal.

6. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 4, characterized in that: The optical fiber transmission device is used to decode the time code optical signal to obtain the 1PPS and TOD timestamps, and transmit the 1PPS and TOD timestamps to the time and frequency terminal device; using the time and frequency terminal device, according to the 1PPS and TOD timestamps, the standard time and frequency reference signal is transmitted to the electric energy metering device as the time and frequency reference of the calibration station.

7. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 4, characterized in that: The time-frequency terminal device comprises: A frequency generation module generates a standard frequency through a processor and a crystal oscillator according to the 1PPS and TOD timestamps in the time code optical signal, obtains the standard time-frequency reference signal, transmits the standard time-frequency reference signal to the electric energy metering device, and provides time-frequency reference information for the electric energy metering device; The time difference measurement module is used to measure the standard time-frequency reference signal to obtain the time difference data, wherein the reference 1PPS data output by the time-frequency terminal device is measured, and the 1PPS phase difference between the internal clock module and the external time-frequency application terminal is measured; the frequency deviation of the frequency generation module and the external time-frequency application terminal is measured, and the time difference measurement module is connected to the frequency generation module.

8. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 4, characterized in that: The NTP network timing device is used to perform timing and monitoring on the platform control computer, process to obtain time-frequency signals, and uniformly manage the electric energy metering device according to the time-frequency signals, wherein the NTP network timing device also includes: The network time generation module is used to receive the 1PPS and TOD timestamps generated by the time code decoder module, generate NTP and SNTP network protocols through the processor and preset software, set up the network time server, and provide the time synchronization signal for the station control computer; The timestamp generation module is used to receive the 1PPS and TOD timestamps, and output the 1PPS and TOD timestamps to the electric energy metering device through delay compensation circuit, protocol conversion, and level conversion to provide reference time; and output the reference 1PPS data to the time difference measurement module for collecting accuracy monitoring information.

9. The time and frequency remote measurement transmission terminal of an electric energy metering device according to claim 4, characterized in that: The data monitoring device includes: a state monitoring module, which is used to obtain a time code optical signal from the time difference data measured by the time difference measurement module, and report the time code optical signal to the time code generator and the loop monitoring module through the optical fiber loop.

10. A time and frequency remote measurement transmission method for an electric energy metering device, used to control a time and frequency remote measurement transmission terminal for an electric energy metering device as claimed in any one of claims 1 to 9, characterized in that: The method comprises: Use the provincial time and frequency reference standard module to provide provincial time and frequency reference standards; Using the prefecture-level common-view device, through the preset network, the provincial time and frequency reference standard is traced back to the local area by using the satellite common-view method; the local time and frequency reference standard is transmitted to the time and frequency remote transmission terminal through the preset optical fiber; Using the time and frequency remote measurement transmission terminal, a standard time and frequency reference signal of an electric energy metering device is generated, and the standard time and frequency reference signal is transmitted to the electric energy metering device through a preset cable; The electric energy metering device is used to perform time and frequency remote measurement transmission operations according to the standard time and frequency reference signal.

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