CN104614696A - Transient sampling pre-unit for transient testing of electronic transformer and merging unit - Google Patents
Transient sampling pre-unit for transient testing of electronic transformer and merging unit Download PDFInfo
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- CN104614696A CN104614696A CN201510018321.9A CN201510018321A CN104614696A CN 104614696 A CN104614696 A CN 104614696A CN 201510018321 A CN201510018321 A CN 201510018321A CN 104614696 A CN104614696 A CN 104614696A
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Abstract
The invention provides a transient sampling pre-unit for transient testing of an electronic transformer and a merging unit. The transient sampling pre-unit is composed of a precision current converter, a signal processing circuit, a synchronous AD converter, a constant-temperature crystal oscillator and an FPGA (field-programmable gate array). The signal processing circuit comprises is used for performing signal conditioning on a standard source transient current signal converted by the precision current converter, signal conditioning on the transient low voltage signal of the standard source and signal conditioning on the low voltage signal of an electronic transformer test object; the three signals conditioned are sent into the synchronous AD converter; the synchronous AD converter is connected with the FPGA and outputs signals via an optical fiber serial transmitter. The transient sampling pre-unit has the characteristics of high-speed sampling, high testing precision, good saturation characteristic, good real-time testing property, excellent anti-interference performance, good safety and the like. The transient sampling pre-unit is capable of accurately testing the transient precision of the digital quantity transmitted by the merging unit based on discrete data and providing detection basis for large-area promotion of intelligent substations.
Description
Technical field
The transient state that the present invention relates to a kind of electronic mutual inductor and merge cells transient test is sampled front end units, belongs to electric-power metering technical field of measurement and test.
Background technology
At present, the development of intelligent substation and digital transformer substation has entered into the large area engineer applied stage, along with the extensive application of electronic mutual inductor, traditional mutual inductor+merge cells pattern, merge cells will formally become the smart machine of intelligent substation and digital transformer substation.Along with the issue of State Grid Corporation of China Q/GDW 441-2010 " intelligent substation Protection Technology specification ", the characteristic test of merge cells becomes abnormal important.Even it is substantially all test based on the transient state process of small area analysis that current domestic merge cells mainly carries out testing transient test in stable state aspect, and the restriction that the transient state of big current is impacted owing to being limited by the factors such as the ability restriction of tester own and personal safety is never well carried out.And whether merge cells transient heavy current in case of a fault correctly the progress of disease can directly have influence on the safety of intelligent substation digital relay protection.Electronic mutual inductor due to current value ratio during transient test comparatively conference have influence on personal safety.
So from current present situation, accurately measure the transient state process of fault current in the urgent need to a kind of device and measurement result will be delivered to merge cells tester to test the progress of disease precision of merge cells in transient state process, and the transient state input test of compatible electronic formula mutual inductor.
Summary of the invention
The object of the invention is, in order to solve intelligent substation and the test request of digital transformer substation for merge cells and electronic mutual inductor in transient state Transfer characteristic in transient state situation etc., and for the state of the art that current existing electronic mutual inductor and merge cells are applied, develop the transient state front end units of electronic mutual inductor and merge cells transient test, to meet merge cells tester for intelligent substation electronic mutual inductor and merge cells transient state Transfer characteristic test in case of a fault.
Technical scheme of the present invention is, a kind of electronic mutual inductor of the present invention and the transient state of merge cells transient test front end units of sampling is made up of precision current converter, signal processing circuit, synchronous AD converter, constant-temperature crystal oscillator and FPGA field programmable gate array.
Precision current converter, for realizing the accurate transformation of transient current, is converted to transient state small voltage signal by transient current signal;
Signal processing circuit, suppresses to realize signals collecting, to guarantee the fidelity of transient state process electric current and attenuation constant thereof according to identical bandwidth after carrying out signal condition to the small voltage signal of separate sources;
Synchronous AD converter, for realizing the synchronous acquisition of multiple signals;
FPGA field programmable gate array, for realizing data transformations and timed sending; And,
For ensureing the constant-temperature crystal oscillator of the accuracy of FPGA sequential.
Precision current converter connection signal treatment circuit; Signal processing circuit connects synchronous AD converter; Synchronous AD converter connects FPGA; FPGA is exported by fiber optic serial transmitter; Constant-temperature crystal oscillator connects FPGA.
Signal processing circuit of the present invention comprises the signal condition of the signal condition of standard source transient current signal, the signal condition of transient state small voltage signal of standard source and the small voltage signal of electronic mutual inductor test product changed through precision current converter; Synchronous AD converter is entered after three road signal conditions.
The present invention gathers standard source transient current signal, the transient state small voltage signal of standard source and the small voltage signal of electronic mutual inductor test product simultaneously, utilize high precision antisaturation CT original big current signal is transformed into can be collected small voltage signal, suppress to realize signals collecting according to identical bandwidth after carrying out signal condition to the small voltage signal of above three separate sources, cutoff frequency is 10kHz, to guarantee the fidelity of transient state process electric current and attenuation constant thereof.
The present invention adopts synchronous acquisition mode, is realized the synchronous acquisition of multiple signals by the multi pass acquisition of same a slice AD, and AD sampling rate is every cycle 400 point.
The present invention adopts FPGA as the terminal core CPU of test macro, so have good browsing real-time data, respond fast, temporal resolution can reach 20ns, realizes gathering preposition precise time transfer.The present invention realizes data transformations and timed sending by FPGA, ensures the accuracy of FPGA sequential with constant-temperature crystal oscillator; FPGA sends data acquisition Manchester's cde according to serial mode and realizes synchrodata and send, and sampling bandwidth is 10M, and data bandwidth is 5M, to guarantee the real-time transmission of transmitting high speed sampled data.Determine delay value at message header quota in message transmission so that electronic mutual inductor and merge cells tester to realize the data time that transient state samples between preposition data and the digital quantity signal of merge cells test product synchronous.
Precision current converter of the present invention is for realizing the accurate transformation of transient current, transient current signal is converted to transient state small voltage signal, adopt high precision antisaturation iron core, make front end units can bear 50 times of specified interchanges and superpose the transient current of 50 times of direct currents under attenuation constant 200ms and accurately change.
Employing internal battery is powered, and designs floatingly, and fibre optic data transmission realizes separate men from machines, to improve security and the reliability of whole system.
The invention has the beneficial effects as follows, the transient state of compatible electronic formula mutual inductor of the present invention and merge cells transient test is sampled front end units, accurately can measure the transient state process of fault current and measurement result will be delivered to merge cells tester to test the progress of disease precision of merge cells in transient state process, apparatus of the present invention have following characteristics: sampling at a high speed, adopt the sampling rate of 20k, meet the transient test demand of merge cells test product 4k sampling rate completely; Measuring accuracy is high, adopts a point loop design, carries out a point loop design, can guarantee that different merge cells can be tested, meet the transient current precision under different range simultaneously according to the specified transient current size different from 5A rated current of 1A; Saturation characteristic is good, adopts antisaturation iron core, makes front end units can bear 50 times of specified interchanges and superpose the accurate progress of disease of the transient current of 50 times of direct currents under attenuation constant 200ms.Real-time is good.Because adopt FPGA as the terminal core CPU of test macro, so have good browsing real-time data, respond fast, temporal resolution can reach 20ns, realizes gathering preposition precise time transfer.Time precision is high, and built-in constant temperature essence is shaken, and the temperature stability of its time reaches 0.01ppm.Interference free performance is superior, adopts powered battery, designs floatingly, stop the impact of undesired signal on sampling system.Security is good, adopts serial optical fiber to sample and to be prepositionly connected with merge cells tester, make transient test away from operating personnel, avoid transient heavy current and impact the personal injury caused, can compatible electronic formula mutual inductor.
Apparatus of the present invention accurately can test the digital quantity transient state precision of merge cells based on discrete data transmission, and the spread for intelligent substation provides detection foundation.
Accompanying drawing explanation
fig. 1 is that the transient state of electronic mutual inductor of the present invention and merge cells transient test is sampled front end units structured flowchart.
Embodiment
The specific embodiment of the invention as shown in Figure 1.The present embodiment electronic mutual inductor and the transient state of merge cells transient test front end units of sampling is made up of precision current converter, signal processing circuit, synchronous AD converter, constant-temperature crystal oscillator and FPGA field programmable gate array, part in dotted line as shown in Figure 1.
In the present embodiment, precision current converter connection signal treatment circuit; Signal processing circuit connects synchronous AD converter; Synchronous AD converter connects FPGA; FPGA exports merge cells tester to by fiber optic serial transmitter; Constant-temperature crystal oscillator connects FPGA; Tested merge cells connects merge cells tester by fiber optic serial transmitter.Main frame and the test product merge cells of merge cells tester beyond block diagram dotted portion in Fig. 1, the main frame of merge cells tester is responsible for receiving the collection signal from transient state sampling front end units, and the digital quantity signal accepted from the IEC61850-9-2 of test product merge cells, complete the transient test for test product merge cells.
The present embodiment precision current converter adopts the iron core of band air gap to realize transient current and really changes, superposition 50 times of decaying dcs are exchanged at 50 times, when damping time constant is less than 200ms, the instantaneous precision of transient state reaches 1%, and transient state combination misalignment precision is higher than 0.2%.Signal condition loop adopts 4 rank Bezier filtering, and its cutoff frequency is 10kHz.The hi-fi of transient signal can be ensured.A/D chip adopts AD company 18 multi-channel A/D chip AD7982 to ensure its FR transient state sampling precision, and multichannel gathers simultaneously and realizes precise synchronization.
The present embodiment fiber optic serial transmitter adopts the HFBR-1414 of Agilent, ensures enough bandwidth sum response speeds, and adopt the Manchester's cde of 10M baud rate, data bandwidth is 5M.FPGA adopts the Spartan3 series of products XC3S1500 of Xilinx, and the data serial realizing transient state sampling front end units sends.FPGA, based on 0.01ppm constant-temperature crystal oscillator, carries out precise time demarcation to each sampled value, and the time jitter receiving link can control in nanosecond rank by the capability of sequential control that FPGA is good.Constant-temperature crystal oscillator adopts its temperature frequency degree of stability of JKOC36 to reach ± 5E-9.
The present embodiment built-in rechargeable battery, rechargeable battery adopts 220V AC charging, exports as 5V direct current, and once charging can allow sampling front end units work 7 × 24 hours.Ensure that transient state front end units completes whole test process without the need to externally fed with when artificially interfering.
Claims (7)
1. the transient state of electronic mutual inductor and merge cells transient test is sampled a front end units, it is characterized in that, comprising:
Precision current converter, for realizing the accurate transformation of transient current, is converted to transient state small voltage signal by transient current signal;
Signal processing circuit, suppresses to realize signals collecting, to guarantee the fidelity of transient state process electric current and attenuation constant thereof according to identical bandwidth after carrying out signal condition to the small voltage signal of separate sources;
Synchronous AD converter, for realizing the synchronous acquisition of multiple signals;
FPGA field programmable gate array, for realizing data transformations and timed sending; And,
For ensureing the constant-temperature crystal oscillator of the accuracy of FPGA sequential.
2. the transient state of electronic mutual inductor according to claim 1 and merge cells transient test is sampled front end units, it is characterized in that, described precision current converter adopts high precision antisaturation iron core, make front end units can bear 50 times of specified interchanges, superpose the transient current of 50 times of direct currents under attenuation constant 200ms and accurately change.
3. the transient state of electronic mutual inductor according to claim 1 and merge cells transient test is sampled front end units, it is characterized in that, described signal processing circuit comprises the signal condition of the signal condition of standard source transient current signal, the signal condition of transient state small voltage signal of standard source and the small voltage signal of electronic mutual inductor test product changed through precision current converter; Described signal condition loop adopts 4 rank Bezier filtering, and its cutoff frequency is 10kHz.
4. the transient state of electronic mutual inductor according to claim 1 and merge cells transient test is sampled front end units, it is characterized in that, described FPGA sends data by fiber optic serial transmitter according to serial mode, adopt Manchester's cde to realize synchrodata to send, sampling bandwidth is 10M, data bandwidth is 5M, to guarantee the real-time transmission of transmitting high speed sampled data; Determine delay value at message header quota in message transmission so that electronic mutual inductor and merge cells tester to realize the data time that transient state samples between preposition data and the digital quantity signal of merge cells test product synchronous.
5. the transient state of electronic mutual inductor according to claim 1 and merge cells transient test is sampled front end units, it is characterized in that, described synchronous AD converter adopts 18 multi-channel A/D chip AD7982, and ensure its FR transient state sampling precision, multichannel gathers simultaneously and realizes precise synchronization; AD sampling rate is every cycle 400 point.
6. the transient state of electronic mutual inductor according to claim 1 and merge cells transient test is sampled front end units, it is characterized in that, described precision current converter connection signal treatment circuit; Signal processing circuit connects synchronous AD converter; Synchronous AD converter connects FPGA; FPGA is exported by fiber optic serial transmitter; Constant-temperature crystal oscillator connects FPGA.
7. the transient state of electronic mutual inductor according to claim 1 and merge cells transient test is sampled front end units, and it is characterized in that, described constant-temperature crystal oscillator is for ensureing the accuracy of FPGA sequential.
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| CN105116213A (en) * | 2015-09-30 | 2015-12-02 | 三峡大学 | On line measuring device for voltage and current differential signals |
| CN105974351A (en) * | 2016-06-14 | 2016-09-28 | 贵州电网有限责任公司电力科学研究院 | Mutual inductor transient testing device and method with controllable amplification of Rogowski coil differential signals |
| CN107525978A (en) * | 2016-06-22 | 2017-12-29 | 辽宁省送变电工程公司 | A kind of combining unit transient current method of testing and device based on transient state source |
| CN108693495A (en) * | 2018-09-06 | 2018-10-23 | 广东电网有限责任公司 | A kind of DC electronic transformer detection converter that sampling is adaptive |
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| CN107525978A (en) * | 2016-06-22 | 2017-12-29 | 辽宁省送变电工程公司 | A kind of combining unit transient current method of testing and device based on transient state source |
| CN108693495A (en) * | 2018-09-06 | 2018-10-23 | 广东电网有限责任公司 | A kind of DC electronic transformer detection converter that sampling is adaptive |
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Application publication date: 20150513 |