CN108872921A - Device and method for verifying broadband characteristics of direct current transformer - Google Patents
Device and method for verifying broadband characteristics of direct current transformer Download PDFInfo
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- CN108872921A CN108872921A CN201810858336.XA CN201810858336A CN108872921A CN 108872921 A CN108872921 A CN 108872921A CN 201810858336 A CN201810858336 A CN 201810858336A CN 108872921 A CN108872921 A CN 108872921A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a device and a method for verifying broadband characteristics of a direct current transformer, and belongs to the key technology of intelligent equipment. The device of the invention comprises: the system comprises a clock synchronization device, a message analysis device, a high-speed acquisition card and a digital verification system, wherein the digital verification system receives discrete sampling data of the message analysis device and the high-speed acquisition card and calculates a broadband error result and a steady-state error result of the direct current transformer according to the discrete sampling data in a digital quantity verification mode, and the digital verification system receives the discrete sampling data output by the high-speed acquisition card and calculates the broadband error result and the steady-state error result of the direct current transformer according to the discrete sampling data in an analog quantity verification mode. The invention has the functions of realizing the broadband characteristic verification and the steady-state error verification of the direct current transformer outputting analog quantity signals and digital quantity signals, can accurately measure the broadband error of the direct current transformer, and provides a technical means for the accurate calibration of the broadband measurement characteristic of the direct current transformer.
Description
Technical field
The present invention relates to smart machine key technology areas, and relate more specifically to a kind of DC current transformer wideband
Checked for characteristics device and method.
Background technique
With the continuous development of propulsion and the direct current transportation of global energy Internet Construction, direct current instrument transformer application is also got over
Come it is more extensive, for guarantee DC transmission system safety and stability reliability service, need the measurement to direct current instrument transformer accurate and reliable
Property put forward higher requirements, direct current instrument transformer calibration detection needs will gradually increase.Standard GB/T/T 26216.1 and GB/
T 26216.2 defines the requirement such as direct current accuracy, frequency response, cutoff frequency and step response of DC current transformer,
Rapid survey and response to electric current are also the basic demand of direct current control and protection system, these are all to the wideband of DC current transformer
Measurement characteristic proposes strict requirements.But since experimental condition limits, existing test system has only carried out direct current instrument transformer
Direct current accuracy test, it is smaller to the calibration technology research of wideband measurement characteristic, cause the wideband of DC current transformer to verify
Attribute testing is carried out less.For the DC current transformer of digital output, due to needing to parse FT3 number message and being directed to
Discrete digital signal carries out Fourier and is calculated than difference and angular difference, therefore verifies compared to conventional AC mutual inductor wideband, direct current
The broadband properties verification difficulty of current transformer is higher, and the research of development is less.
As HVDC Transmission Technology is increasingly mature and the demand of DC current transformer broadband properties verification gradually increases, state
Inside be engaged in high accuracy, wideband current measurement research be mainly China National Measuring Science Research Inst., China Electric Power Research Institute and
Some universities are all actively developing the relevant scientific research of DC current transformer broadband properties verification at present.
A kind of wideband current transformer calibrator of utility model patent of Co., Ltd of China Electric Power Research Institute application
(the patent No.：201420466252.9) using lock-in amplifier be used as and digital multimeter for analog output wideband electric current
The broadband properties of mutual inductor verify, and calibration frequency range is 50Hz~3000Hz, are not suitable for the DC current of digital output
Mutual inductor；A kind of DC voltage transformer frequency of patent of invention of Electric Power Research Institute of Yunnan Power System Co., Ltd application
Response detection device (the patent No.：201621373266.1) defeated using frequency detection circuit and Waveform Matching circuit realization digital quantity
Direct current instrument transformer broadband properties are verified out, are not suitable for analog output direct current instrument transformer.Guangdong Power Grid Limited Liability is public
Take charge of a kind of high-precision high voltage DC mutual inductor verification instrument (patent No. of patent of invention of Electric Power Research Institute's application：
201510007457.X) and the DC mutual inductor verification instrument (patent No. of a kind of compatible analog amount and digital quantity verifying function：
201510270926.7) using double A/D sampling module and network communication module based on IEC61850 agreement for analog quantity or
The frequency characteristic of the direct current instrument transformer of digital output verifies, and frequency range is 50Hz~1200Hz.China Power scientific research
Institute has accumulated many experiences in terms of direct current instrument transformer broadband properties verification, currently takes the lead and drafts multinomial direct current instrument transformer phase
Vertification regulation, power industry standard and the company standard of pass improve the technical specification and calibration examination criteria of direct current instrument transformer.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of DC current transformer broadband properties calibration equipment, it is of the present invention
Device includes：Clock synchronization apparatus, to packet parsing device transmission synchronous triggering signal synchronous with high-speed collection card, synchronous triggering
Signal triggering high-speed collection card and packet parsing device receive analog signals and the direct current mutual inductance of standard mutual inductor output simultaneously
The digital quantity signal of device output；Synchronous triggering signal triggering high-speed collection card receives standard mutual inductor simultaneously and direct current instrument transformer is defeated
Analog signals out；
Packet parsing device, when packet parsing device receives synchronous triggering signal, packet parsing device receives direct current
The digital quantity signal of mutual inductor output is simultaneously parsed into discrete sampling data, and discrete sample signals are transferred to number by Ethernet
Check system
High-speed collection card, an analog input channel of high-speed collection card receive the analog quantity letter of standard mutual inductor output
Number and be converted into discrete sampling data after sampling to analog signals, discrete sampling data are arrived by PXI bus transfer
Digit check system, two analog input channels of high-speed collection card receive the mould of standard mutual inductor and direct current instrument transformer output
Analog quantity signal is simultaneously converted into discrete sampling data after sampling to analog signals, and discrete sampling data are passed through PXI bus
It is transferred to digit check system；
Digit check system receives the discrete sampling data of packet parsing device and high-speed collection card in digital quantity calibration mode
The wideband error and steady-state error for calculating direct current instrument transformer according to discrete sampling data under formula are as a result, digit check system receives
The discrete sampling data of high-speed collection card output calculate direct current mutual inductance according to discrete sampling data under analog quantity checking mode
The wideband error and steady-state error result of device.
Optionally, digital quantity signal is IEC61850 message or FT3 message.
Optionally, packet parsing device uses FPGA Parallel processing designs framework and PPC8313 embeded processor.
Optionally, packet parsing device has the ST optical fiber end of the ethernet port, FT3 message of supporting IEC61850 message
The phototiming port and ethernet communication port of mouth, PPS and IRIG-B.
Optionally, packet parsing device receive direct current instrument transformer output IEC61850 message or FT3 message, FPGA simultaneously
It is decoded and serioparallel exchange in row processing design architecture, the message received is subjected to buffered, then passes through parallel bus
It is transmitted to PPC8313 embeded processor, the message that PPC8313 embeded processor transmits FPGA Parallel processing designs framework
It is packaged into discrete sampling data.
Optionally, high-speed collection card is PXIe-5922 capture card, and the high-speed collection card includes that two analog signals are defeated
Inbound port, an external sync triggering port and a PXI bus interface, the high-speed collection card sample rate are set as 2MHz.
Optionally, digit check system is the hardware platform based on X86 framework and Windows operating system, is equipped with base
In the upper computer software of LabVIEW software development.
Optionally, analog quantity checking mode and digital quantity checking mode are set in the upper computer software of digit check system,
Realize the verifying function of analog quantity and digital output direct current instrument transformer.
Optionally, digit check system is in the discrete sampling data for receiving packet parsing device and high-speed collection card output
Afterwards, discrete Fourier transforms are carried out to two groups of discrete sampling data respectively, obtains the discrete of standard mutual inductor and direct current instrument transformer
The amplitude and phase information of sampled signal at each frequency.
Optionally, the upper computer software of digit check system shows the sample waveform of standard mutual inductor and direct current instrument transformer,
With packet parsing device and high-speed collection card parameter setting function and error result display function, measurement result is exported to
In Excel file.
Optionally, clock synchronization apparatus use the FPGA system based on NIOS kernel, by receive outer synchronous signal or
Internal High Precision Crystal Oscillator generates high-frequency pulse signal, and the pulse signal of 1Hz is generated after frequency dividing, is input to packet parsing device
With high-speed collection card for direct current instrument transformer digital quantity signal or analog signals and standard mutual inductor analog signals it is same
Step acquisition, exports clock sync signal to direct current instrument transformer by ST fiber port or BNC coaxial cable port outward, makes direct current
Mutual inductor synchronism output digital quantity signal.
Optionally, the synchronization pulse that clock synchronization apparatus is generated by receiving outer synchronous signal, calibration equipment
Signal acquisition is synchronous with external realization.
The present invention also provides a kind of direct current instrument transformer broadband properties method of calibration, the method includes：
Clock synchronization apparatus is believed to packet parsing device transmission synchronous triggering signal synchronous with high-speed collection card, synchronous triggering
Number triggering high-speed collection card and packet parsing device simultaneously receive standard mutual inductor output analog signals and direct current instrument transformer
The digital quantity signal of output；Synchronous triggering signal triggering high-speed collection card receives standard mutual inductor and direct current instrument transformer output simultaneously
Analog signals；
Under digital quantity checking mode, when packet parsing device and high-speed collection card receive synchronous triggering signal, message
Resolver receives the digital quantity signal of direct current instrument transformer output and is parsed into discrete sampling data, is adopted by Ethernet by discrete
Sample signal is transferred to digit check system, and an analog input channel of high-speed collection card receives the mould of standard mutual inductor output
Analog quantity signal is simultaneously converted into discrete sampling data after sampling to analog signals, and discrete sampling data are passed through PXI bus
It is transferred to digit check system；
Under analog quantity checking mode, when high-speed collection card receives synchronous triggering signal, two simulations of high-speed collection card
After amount input channel receives the analog signals of standard mutual inductor and direct current instrument transformer output and samples to analog signals
Discrete sampling data are converted into, discrete sampling data are passed through into PXI bus transfer to digit check system；
Digit check system receives the discrete sampling data of packet parsing device and high-speed collection card in digital quantity calibration mode
The wideband error and steady-state error for calculating direct current instrument transformer according to discrete sampling data under formula are as a result, digit check system receives
The discrete sampling data of high-speed collection card output calculate direct current mutual inductance according to discrete sampling data under analog quantity checking mode
The wideband error and steady-state error result of device.
The advantage of the invention is that：
The wideband that the present invention has the DC current transformer that can be realized analog signals and digital quantity signal output is special
Property verification and steady-state error verifying function, support IEC61850 and FT3 number message protocol, have standard mutual inductor and tested mutual
Sensor sample waveform is shown and measurement result exports to Excel function, and the wideband for capableing of precise measurement DC current transformer misses
Difference provides a kind of technological means for the wideband measurement characteristic accurate calibration of DC current transformer.
Detailed description of the invention
Fig. 1 is a kind of direct current instrument transformer broadband properties calibration equipment structure chart of the present invention；
Fig. 2 is a kind of direct current instrument transformer broadband properties method of calibration flow chart of the present invention.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
The present invention provides a kind of direct current instrument transformer broadband properties calibration equipment, as shown in Figure 1, this hair invention device includes：
Clock synchronization apparatus, clock synchronization apparatus use the FPGA system based on NIOS kernel, by receiving external sync
Signal or internal High Precision Crystal Oscillator generate high-frequency pulse signal, and the pulse signal of 1Hz is generated after frequency dividing, is input to message solution
Digital quantity signal or analog signals and standard mutual inductor the analog quantity letter of analysis apparatus and high-speed collection card for direct current instrument transformer
Number synchronous acquisition, export clock sync signal outward to direct current instrument transformer by ST fiber port or BNC coaxial cable port,
Make direct current instrument transformer synchronism output digital quantity signal.The lock-out pulse that clock synchronization apparatus is generated by receiving outer synchronous signal
Signal, the signal acquisition of calibration equipment are synchronous with external realization.
Clock synchronization apparatus is believed to packet parsing device transmission synchronous triggering signal synchronous with high-speed collection card, synchronous triggering
Number triggering high-speed collection card and packet parsing device simultaneously receive standard mutual inductor output analog signals and direct current instrument transformer
The digital quantity signal of output；Synchronous triggering signal triggering high-speed collection card receives standard mutual inductor and direct current instrument transformer output simultaneously
Analog signals；
Packet parsing device, packet parsing device use FPGA Parallel processing designs framework and PPC8313 embedded processing
Device has the phototiming end for supporting the ethernet port of IEC61850 message, the ST fiber port of FT3 message, PPS and IRIG-B
Mouth and ethernet communication port, when packet parsing device receives synchronous triggering signal, it is mutual that packet parsing device receives direct current
Sensor exports IEC61850 message or FT3 message, is decoded in FPGA Parallel processing designs framework and serioparallel exchange, will receive
The message arrived carries out buffered, and then by parallel bus transfers to PPC8313 embeded processor, PPC8313 is embedded
The message that processor transmits FPGA Parallel processing designs framework is packaged into discrete sampling data, by Ethernet by discrete sampling
Signal is transferred to digit check system
High-speed collection card, high-speed collection card are PXIe-5922 capture card, and high-speed collection card includes that two analog signals are defeated
Inbound port, an external sync triggering port and a PXI bus interface, high-speed collection card sample rate are set as 2MHz, high speed
One analog input channel of capture card receives the analog signals of standard mutual inductor output and adopts to analog signals
It is converted into discrete sampling data after sample, discrete sampling data are passed through into PXI bus transfer to digit check system, high-speed collection card
Two analog input channels receive standard mutual inductor and direct current instrument transformer output analog signals and to analog signals
It is converted into discrete sampling data after being sampled, discrete sampling data are passed through into PXI bus transfer to digit check system；
Digit check system, digit check system are the hardware platforms based on X86 framework and Windows operating system, number
The upper computer software of word check system shows the sample waveform of standard mutual inductor and direct current instrument transformer, have packet parsing device and
High-speed collection card parameter setting function and error result display function, measurement result are exported in Excel file, digit check
System is equipped with the upper computer software based on LabVIEW software development, and analog quantity checking mode sum number is arranged in upper computer software
Word amount checking mode realizes the verifying function of analog quantity and digital output direct current instrument transformer, receives packet parsing device and height
The discrete sampling data of fast capture card calculate the width of direct current instrument transformer under digital quantity checking mode according to discrete sampling data
Frequency error and steady-state error are as a result, the discrete sampling data that digit check system receives high-speed collection card output are verified in analog quantity
The wideband error and steady-state error for calculating direct current instrument transformer according to discrete sampling data under mode are as a result, specifically, digital school
Check system is after the discrete sampling data for receiving packet parsing device and high-speed collection card output, respectively to two groups of discrete samplings
Data carry out discrete Fourier transform, obtain the width of the discrete sample signals of standard mutual inductor and direct current instrument transformer at each frequency
Value and phase information.
The present invention also provides a kind of direct current instrument transformer broadband properties methods of calibration, as shown in Fig. 2, specifically including：
Clock synchronization apparatus is believed to packet parsing device transmission synchronous triggering signal synchronous with high-speed collection card, synchronous triggering
Number triggering high-speed collection card and packet parsing device simultaneously receive standard mutual inductor output analog signals and direct current instrument transformer
The digital quantity signal of output；Synchronous triggering signal triggering high-speed collection card receives standard mutual inductor and direct current instrument transformer output simultaneously
Analog signals；
Under digital quantity checking mode, when packet parsing device and high-speed collection card receive synchronous triggering signal, message
Resolver receives the digital quantity signal of direct current instrument transformer output and is parsed into discrete sampling data, is adopted by Ethernet by discrete
Sample signal is transferred to digit check system, and an analog input channel of high-speed collection card receives the mould of standard mutual inductor output
Analog quantity signal is simultaneously converted into discrete sampling data after sampling to analog signals, and discrete sampling data are passed through PXI bus
It is transferred to digit check system；
Under analog quantity checking mode, when high-speed collection card receives synchronous triggering signal, two simulations of high-speed collection card
After amount input channel receives the analog signals of standard mutual inductor and direct current instrument transformer output and samples to analog signals
Discrete sampling data are converted into, discrete sampling data are passed through into PXI bus transfer to digit check system；
Digit check system receives the discrete sampling data of packet parsing device and high-speed collection card in digital quantity calibration mode
The wideband error and steady-state error for calculating direct current instrument transformer according to discrete sampling data under formula are as a result, digit check system receives
The discrete sampling data of high-speed collection card output calculate direct current mutual inductance according to discrete sampling data under analog quantity checking mode
The wideband error and steady-state error result of device.
The wideband that the present invention has the DC current transformer that can be realized analog signals and digital quantity signal output is special
Property verification and steady-state error verifying function, support IEC61850 and FT3 number message protocol, have standard mutual inductor and tested mutual
Sensor sample waveform is shown and measurement result exports to Excel function, and the wideband for capableing of precise measurement DC current transformer misses
Difference provides a kind of technological means for the wideband measurement characteristic accurate calibration of DC current transformer.
Claims (13)
1. a kind of direct current instrument transformer broadband properties calibration equipment, described device include：
Clock synchronization apparatus, to packet parsing device transmission synchronous triggering signal synchronous with high-speed collection card, synchronous triggering signal
Triggering high-speed collection card and packet parsing device receive the analog signals that standard mutual inductor exports simultaneously and direct current instrument transformer is defeated
Digital quantity signal out；Synchronous triggering signal triggering high-speed collection card simultaneously receive standard mutual inductor and direct current instrument transformer output
Analog signals；
Packet parsing device, when packet parsing device receives synchronous triggering signal, packet parsing device receives direct current mutual inductance
The digital quantity signal of device output is simultaneously parsed into discrete sampling data, and discrete sample signals are transferred to digit check by Ethernet
System
High-speed collection card, an analog input channel of high-speed collection card receive the analog signals of standard mutual inductor output simultaneously
It is converted into discrete sampling data after sampling to analog signals, discrete sampling data are passed through into PXI bus transfer to number
Check system, two analog input channels of high-speed collection card receive the analog quantity of standard mutual inductor and direct current instrument transformer output
Signal is simultaneously converted into discrete sampling data after sampling to analog signals, and discrete sampling data are passed through PXI bus transfer
To digit check system；
The discrete sampling data of digit check system, reception packet parsing device and high-speed collection card are under digital quantity checking mode
The wideband error and steady-state error for calculating direct current instrument transformer according to discrete sampling data are as a result, digit check system receives high speed
The discrete sampling data of capture card output calculate direct current instrument transformer according to discrete sampling data under analog quantity checking mode
Wideband error and steady-state error result.
2. the apparatus according to claim 1, the digital quantity signal is IEC61850 message or FT3 message.
3. the apparatus according to claim 1, the packet parsing device using FPGA Parallel processing designs framework and
PPC8313 embeded processor.
4. the apparatus according to claim 1, the packet parsing device has the Ethernet for supporting IEC61850 message
Port, the ST fiber port of FT3 message, PPS and IRIG-B phototiming port and ethernet communication port.
5. the apparatus according to claim 1, the packet parsing device receives the IEC61850 of direct current instrument transformer output
Message or FT3 message, are decoded and serioparallel exchange in FPGA Parallel processing designs framework, and the message received is buffered
Processing, then by parallel bus transfers to PPC8313 embeded processor, PPC8313 embeded processor is parallel to FPGA
The message of processing design architecture transmission is packaged into discrete sampling data.
6. the apparatus according to claim 1, the high-speed collection card is PXIe-5922 capture card, the high speed acquisition
Card includes that two analog signals input ports, an external sync triggering port and a PXI bus interface, the high speed are adopted
Truck sample rate is set as 2MHz.
7. the apparatus according to claim 1, the digit check system is based on X86 framework and Windows operation system
The hardware platform of system is equipped with the upper computer software based on LabVIEW software development.
8. device according to claim 7, setting analog quantity is verified in the upper computer software of the digit check system
Mode and digital quantity checking mode realize the verifying function of analog quantity and digital output direct current instrument transformer.
9. the apparatus according to claim 1, the digit check system is receiving packet parsing device and is adopting at a high speed
After the discrete sampling data of truck output, discrete Fourier transform is carried out to two groups of discrete sampling data respectively, it is mutual to obtain standard
The amplitude and phase information of the discrete sample signals of sensor and direct current instrument transformer at each frequency.
10. device according to claim 7, the upper computer software of the digit check system show standard mutual inductor and
There is the sample waveform of direct current instrument transformer packet parsing device and high-speed collection card parameter setting function and error result to show function
Can, measurement result is exported in Excel file.
11. the apparatus according to claim 1, the clock synchronization apparatus uses the FPGA system based on NIOS kernel,
High-frequency pulse signal is generated by receiving outer synchronous signal or internal High Precision Crystal Oscillator, the pulse of 1Hz is generated after frequency dividing
Signal is input to packet parsing device and high-speed collection card digital quantity signal or analog signals and mark for direct current instrument transformer
It is synchronous to export clock by ST fiber port or BNC coaxial cable port outward for the synchronous acquisition of quasi- mutual inductor analog signals
Signal makes direct current instrument transformer synchronism output digital quantity signal to direct current instrument transformer.
12. the apparatus according to claim 1, the clock synchronization apparatus is by receiving the same of outer synchronous signal generation
Step pulse signal, the signal acquisition of calibration equipment are synchronous with external realization.
13. a kind of direct current instrument transformer broadband properties method of calibration, the method includes：
Clock synchronization apparatus is touched to packet parsing device transmission synchronous triggering signal synchronous with high-speed collection card, synchronous triggering signal
Hair high-speed collection card and packet parsing device receive analog signals and the direct current instrument transformer output of standard mutual inductor output simultaneously
Digital quantity signal；Synchronous triggering signal triggering high-speed collection card receives the mould of standard mutual inductor and direct current instrument transformer output simultaneously
Analog quantity signal；
Under digital quantity checking mode, when packet parsing device and high-speed collection card receive synchronous triggering signal, packet parsing
Device receives the digital quantity signal of direct current instrument transformer output and is parsed into discrete sampling data, is believed discrete sampling by Ethernet
It number is transferred to digit check system, an analog input channel of high-speed collection card receives the analog quantity of standard mutual inductor output
Signal is simultaneously converted into discrete sampling data after sampling to analog signals, and discrete sampling data are passed through PXI bus transfer
To digit check system；
Under analog quantity checking mode, when high-speed collection card receives synchronous triggering signal, two analog quantitys of high-speed collection card are defeated
Enter the analog signals of channel reception standard mutual inductor and direct current instrument transformer output and is converted after being sampled to analog signals
At discrete sampling data, discrete sampling data are passed through into PXI bus transfer to digit check system；
The discrete sampling data of digit check system reception packet parsing device and high-speed collection card are under digital quantity checking mode
The wideband error and steady-state error for calculating direct current instrument transformer according to discrete sampling data are as a result, digit check system receives high speed
The discrete sampling data of capture card output calculate direct current instrument transformer according to discrete sampling data under analog quantity checking mode
Wideband error and steady-state error result.
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| CN111610482A (en) * | 2020-06-10 | 2020-09-01 | 国网四川省电力公司电力科学研究院 | Converter station direct-current voltage transformer broadband transfer characteristic test system and method |
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| CN111679238B (en) * | 2020-06-16 | 2022-07-22 | 国网四川省电力公司电力科学研究院 | System and method for testing broadband transmission characteristics of direct current transformer |
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| CN113281692A (en) * | 2021-06-30 | 2021-08-20 | 广东电网有限责任公司 | Error self-calibration method and system of direct current transformer calibrator checking device |
| CN113884966A (en) * | 2021-10-27 | 2022-01-04 | 云南电网有限责任公司电力科学研究院 | Alternating current-direct current sensor broadband calibrator and performance detection calibration method thereof |
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