CN103630866A - Transient characteristic detection system and transient characteristic detection method for electronic voltage transformers - Google Patents
Transient characteristic detection system and transient characteristic detection method for electronic voltage transformers Download PDFInfo
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Abstract
The invention discloses a transient characteristic detection system and a transient characteristic detection method for electronic voltage transformers. The system comprises a transient test condition simulation unit, a high-frequency voltage divider, a merging unit and a transient characteristic detection unit. The transient test condition simulation unit outputs a primary high voltage U1, and the primary high voltage U1 is converted into a standard source signal U2 of the transient characteristic detection unit through the high-frequency voltage divider. A detected electronic voltage transformer is connected in parallel with the high-frequency voltage divider, and a sampling value of the detected electronic voltage transformer is sent to the transient characteristic detection unit through an optical fiber interface of the merging unit and used as a detected signal of the transient characteristic detection unit. The transient characteristic detection system and the transient characteristic detection method of the invention can be used for reliably and perfectly detecting the transient characteristic of the electronic voltage transformer to improve the transient performance of the electronic voltage transformer and provide technical support for safe and stable operation of the electronic voltage transformer.
Description
Technical field
The present invention relates to intelligent grid detection technique field, be specifically related to a kind of transient characterisitics detection system and method for electronic type voltage transformer.
Background technology
Fast development along with intelligent grid; electronic type voltage transformer (EVT) is widely applied in intelligent grid; undertaking the metering to secondary side by the progress of disease quickly and accurately of electric system primary side voltage; measure; protection; the IED equipment such as failure wave-recording, the quality of its performance directly affects the operation of IED equipment.
When power grid operation, the frequency of the primary voltage amplitude of electronic type voltage transformer all approaches nominal parameter value, but when superpotential appears in electrical network, or atmospheric discharge, or switching manipulation, or short trouble, or during the situation such as circuit re-switching, the voltage of network system all there will be transient state process, in this process, require electronic type voltage transformer can Millisecond in the time to be no more than the accurate progress of disease primary voltage of error limit, this is for the IED equipment of secondary side, most important.
The transient condition of electronic type voltage transformer is divided into two classes, one class is primary side short circuit, after power supply short circuit between HV Terminal and ground connection low-voltage terminal, the secondary output voltage of electronic type voltage transformer should drop to below 10% of short circuit previous peaks in 1 cycle of rated frequency, another kind of is the reclosing that circuit band is detained electric charge, quantity of electric charge when line switching disconnects depends on the phase place of voltage while disconnecting, the worst situation is in voltage peak moment disconnection, secondary output voltage u (t0) is at this moment variant for the voltage transformer (VT) of different principle, when circuit re-switching, u (t0) will be superimposed upon in sinusoidal signal, can cause transient error, if line disconnection when primary side voltage peak, again when voltage peak and symbol overlap when being detained opposite charge, requirement after coincidence in 2 to 3 cycles instantaneous voltage error be no more than 10%, in 3 to 4.5 cycles, instantaneous voltage error is no more than 5%.
But, because electronic type voltage transformer is output as digital interface, traditional test macro cannot access digital quantity, thereby seriously lag behind while causing the transient test of electronic type voltage transformer, at present both at home and abroad, also for the transient characterisitics of EVT, not carrying out special method of testing and system, is current urgent problem, to guarantee the long-term safety stable operation of electronic type voltage transformer.
Summary of the invention
Technical matters solved by the invention is to overcome test macro traditional in prior art cannot access digital quantity, thereby seriously lag behind while causing the transient test of electronic type voltage transformer, at present both at home and abroad, also for the transient characterisitics of EVT, do not carry out special method of testing and system, transient characterisitics detection system and the method for electronic type voltage transformer provided by the invention, the transient characterisitics to electronic type voltage transformer that can be reliably perfect detect, be intended to improve the transient performance of electronic type voltage transformer, improve the measuring technology of electronic type voltage transformer, for the safe and stable operation of electronic type voltage transformer provides technical guarantee.
In order to achieve the above object, the technical solution adopted in the present invention is:
A transient characterisitics detection system for electronic type voltage transformer, is characterized in that: comprise relay protection condition simulation unit, high frequency voltage divider, merge cells and transient characterisitics detecting unit, the primary side high voltage U of described relay protection condition simulation unit output
1provide test different electric pressures used to tested electronic type voltage transformer, primary side high voltage U
1also by high frequency voltage divider, be converted into low-voltage, as the standard source signal U of transient characterisitics detecting unit
2tested electronic type voltage transformer and high frequency voltage divider are in parallel, and be together in parallel with relay protection condition simulation unit, the sampled value of tested electronic type voltage transformer sends to transient characterisitics detecting unit by the optical fiber interface of merge cells, as the measured signal of transient characterisitics detecting unit.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, is characterized in that: described relay protection condition simulation unit comprises the primary side high voltage U of output
1power supply, the first switch CB1 and second switch CB2, described the first switch CB1 is connected in parallel on the two ends of power supply, connect with the positive pole of power supply in one end of described second switch CB2, the other end is the primary side high voltage U of relay protection condition simulation unit
1output terminal, wherein resistance R g is current-limiting resistance.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, is characterized in that: described transient characterisitics detecting unit comprises
Be positioned on high-tension side front-collection unit, for sampling and processing standard source signal, and send rearmounted processing unit to;
Be positioned at the rearmounted processing unit of low-pressure side, for receiving the standard source signal of measured signal and the collection of front-collection unit, and catch the Sudden Changing Rate of relay protection, carry out data record ripple and error and calculate;
Between described front-collection unit and rearmounted processing unit by optical fiber communication, described rearmounted processing unit also by optical fiber be positioned on high-tension side merge cells and communicate, all adopt IEC61850-9-1, IEC61850-9-2 or FT3 communication protocol.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, it is characterized in that: described front-collection unit comprises dsp processor, electric pressure converter, signal conditioning circuit, ADC Acquisition Circuit, electric battery, optical transmitter and optical receiver described standard source signal U
2by electric pressure converter, be connected with signal conditioning circuit, described signal conditioning circuit is also connected with dsp processor by ADC Acquisition Circuit, described dsp processor sends to rearmounted processing unit by optical transmitter by the standard source signal data of collection, described dsp processor receives by optical receiver the clock sync signal that rearmounted processing unit sends, and send clock sync signal to ADC Acquisition Circuit, control collection period, described electric battery is used for improving operating voltage.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, is characterized in that: described signal conditioning circuit is provided with the low-pass filter circuit that cutoff frequency is not less than 20kHz; The AD chip of described ADC Acquisition Circuit is 24 high-speed sampling chips.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, it is characterized in that: described rearmounted processing unit comprises the first fiber optical transceiver, the second fiber optical transceiver, FPGA, clock module and PowerPC primary processor, the standard source signal sampling value that described the first fiber optical transceiver sends for receiving front-collection unit, and send FPGA to; The measured signal sampled value that described the second fiber optical transceiver sends for receiving merge cells, and send FPGA to; Described clock module carries out synchronized sampling for control criterion source signal and measured signal, be connected with FPGA, described FPGA receives for offset data the additive error that link is brought in time domain, and by the data after time domain compensation, send PowerPC primary processor to, carry out data record ripple and error and calculate.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, it is characterized in that: described rearmounted processing unit also comprises man-machine interface, described man-machine interface is connected with PowerPC primary processor, described man-machine interface comprises high-resolution color LCD display, for completing graphical drafting, the error parameter of data, shows.
The detection method of the transient characterisitics detection system of the electronic type voltage transformer based on above-mentioned, is characterized in that: comprises the following steps,
Step (1), according to formula (1), determines primary side high voltage U
1the output voltage U of power supply
1,
Wherein, U
pfor primary side high voltage U
1the effective value of fundametal compoment, f is fundamental frequency,
for starting phase angle, U
dcfor DC component, U
res(t) be residual voltage component.
Step (2), by controlling relay protection condition simulation unit, controls tested electronic type voltage transformer and enters the relay protection of primary side short circuit or the relay protection that circuit band is detained electric charge reclosing;
The specified phase deviation of step (3) to measured signal
with specified delay time t
drevised, each sampled value of measured signal is carried out to time calibrating, and markers correction
f wherein
rfor the rated frequency value of tested electronic type voltage transformer, thereby make revised measured signal sampled value synchronize and process by markers with standard source signal sampling value;
Step (4) catches mutation voltage Δ u by transient detection, and mutation voltage Δ u is formula (2),
Δu＝|u(t)-u(t-2T)| （2）
Wherein, t is current time, and T is a power frequency cycle time, and u (t) is current instantaneous voltage;
Step (5), when Δ u>Uset, Uset is threshold voltage, Uset=0.4U
p, be judged to be transient state initial;
Step (6) is if the relay protection of primary side short circuit is searched for the magnitude of voltage U of the previous cycle measured signal of transient state initial time
testpeak value U
max, and to instantaneous voltage and 0.1U after transient state initial time one cycle
maxcarry out amplitude judgement, whether qualified to judge the transient characterisitics of primary side short circuit, if the instantaneous voltage after transient state initial time one cycle is greater than 0.1U
max, the transient characterisitics of primary side short circuit are qualified.
Step (7) is if circuit band is detained the relay protection of electric charge reclosing, two cycles from transient state initial time start, whether the instantaneous voltage error ε of calculating in two to three cycle time windows is greater than 10%, whether the instantaneous voltage error ε in three to four half cycles time windows is greater than 5%, whether qualified to judge the transient characterisitics of circuit band delay electric charge reclosing, if the instantaneous voltage error ε in two to three cycle time windows is greater than 10%, instantaneous voltage error ε in three to four half cycles time windows is greater than 5%, and the transient characterisitics that circuit band is detained electric charge reclosing are qualified.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, it is characterized in that: step (2), by controlling relay protection condition simulation unit, controlling tested electronic type voltage transformer, to enter the method that the relay protection of primary side short circuit or circuit band be detained the relay protection of electric charge reclosing be closed second switch CB2, control the first switch CB1 by being disconnected to closure, making the voltage of tested electronic type voltage transformer primary side reduce to zero, is the relay protection of primary side short circuit; Disconnect the first switch CB1, control second switch CB2 at primary side high voltage U
1positive peak place by being closed into disconnection, at primary side high voltage U
1negative peak place by being disconnected to closure, be that circuit band is detained the relay protection of electric charge reclosing.
The transient characterisitics detection system of aforesaid electronic type voltage transformer, is characterized in that: the method for calculating instantaneous voltage error ε is,
(1) error voltage U
e=U
test-U
ref, U wherein
testfor the magnitude of voltage of measured signal, U
refmagnitude of voltage for standard source signal;
(2) by formula (3), obtain instantaneous voltage error ε, formula (3) is as follows,
Wherein, U
pfor primary side high voltage U
1the effective value of fundametal compoment.
The invention has the beneficial effects as follows: the transient characterisitics detection system of electronic type voltage transformer of the present invention, the transient characterisitics to electronic type voltage transformer that can be reliably perfect detect, be intended to improve the transient performance of electronic type voltage transformer, improve the measuring technology of electronic type voltage transformer, for the safe and stable operation of electronic type voltage transformer provides technical guarantee, and have the following advantages
1) detection system can be compatible without principle, different manufacturers, and the electronic type voltage transformer of different agreement interface, has very high versatility;
2) can test two kinds of relay protections that primary side short circuit and circuit band are detained electric charge reclosing, transient state examination is strict;
3) test macro does not rely on the current synchronous regime of electronic type voltage transformer, and specified phase deviation, the specified delay time of energy adaptive electro minor voltage transformer (VT), realizes synchronous;
4) by high precision high bandwidth analog quantity, sample, and the reception of the digital quantity based on FPGA, source data collection completed, by perfect Sudden Changing Rate, catch and filtering algorithm, completed the calculating of error, guaranteed the high precision of detection system, measuring error is no more than 1%;
5) transient characterisitics detecting unit is high and low pressure side separate type, has reduced interference and error that the long-distance transmissions of simulating signal is brought, the security that has greatly improved again detection system.
Accompanying drawing explanation
Fig. 1 is the system chart of the transient characterisitics detection system of electronic type voltage transformer of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, a kind of transient characterisitics detection system of electronic type voltage transformer, comprises relay protection condition simulation unit, high frequency voltage divider, merge cells and transient characterisitics detecting unit, the primary side high voltage U of relay protection condition simulation unit output
1provide test different electric pressures used to tested electronic type voltage transformer, primary side high voltage U
1also by high frequency voltage divider, be converted into low-voltage, as the standard source signal U of transient characterisitics detecting unit
2high frequency voltage divider has high bandwidth and high-precision characteristic, can guarantee the high-fidelity progress of disease to transient voltage, by tested electronic type voltage transformer and high frequency voltage divider, be in parallel, and be together in parallel with relay protection condition simulation unit, the sampled value of tested electronic type voltage transformer sends to transient characterisitics detecting unit by the optical fiber interface of merge cells, as the measured signal of transient characterisitics detecting unit.
Described relay protection condition simulation unit comprises the primary side high voltage U of output
1power supply, the first switch CB1 and second switch CB2, described the first switch CB1 is connected in parallel on the two ends of power supply, connect with the positive pole of power supply in one end of described second switch CB2, the other end is the primary side high voltage U of relay protection condition simulation unit
1output terminal.
Described transient characterisitics detecting unit comprises and is positioned on high-tension side front-collection unit, for sampling and processing standard source signal, and sends rearmounted processing unit to; Be positioned at the rearmounted processing unit of low-pressure side, for receiving the standard source signal of measured signal and the collection of front-collection unit, and catch the Sudden Changing Rate of relay protection, carry out data record ripple and error and calculate;
Between described front-collection unit and rearmounted processing unit by optical fiber communication, described rearmounted processing unit also by optical fiber be positioned on high-tension side merge cells and communicate, all adopt IEC61850-9-1, IEC61850-9-2 or FT3 communication protocol.
Described front-collection unit comprises dsp processor, electric pressure converter, signal conditioning circuit, ADC Acquisition Circuit, electric battery, optical transmitter and optical receiver, described standard source signal U
2by electric pressure converter, be connected with signal conditioning circuit, electric pressure converter is by standard source signal U
2output can be for the peak value 10V gathering with interior voltage U
3described signal conditioning circuit is also connected with dsp processor by ADC Acquisition Circuit, described dsp processor sends to rearmounted processing unit by optical transmitter by the standard source signal data of collection, described dsp processor receives by optical receiver the clock sync signal that rearmounted processing unit sends, and send clock sync signal to ADC Acquisition Circuit, control collection period, described electric battery is used for improving operating voltage, and described signal conditioning circuit is provided with the low-pass filter circuit that cutoff frequency is not less than 20kHz, the AD chip of described ADC Acquisition Circuit is 24 high-speed sampling chips, select 24 analog to digital converter AD7765 chips of ADI company, sampling rate is decided to be 78kHz, now dynamic range is up to being 115dB, this turns AD chip and has outstanding DC characteristic, be highly suitable in the situation that simultaneously needs DC data AC signal is carried out to high-speed data acquisition, the built-in FIR wave filter of full range, can on nyquist frequency point, obtain the full stopband attenuation of wave filter, this characteristic can prevent that the signal aliasing that is greater than nyquist frequency from feeding back in input signal bandwidth better, AD7765 chip provides low-power consumption mode, can significantly reduce power consumption, but can not reduce output data rate or available input bandwidth, dsp processor is selected 32 floating-point TMS320C6745 chips of TI company low-power consumption, this dsp processor be take C674x DSP core as basis, possess the floating-point advantage online periphery unique with past fixed DSP, the characteristics such as low-power consumption and low cost, frequency can reach 300MHz, comprise the multichannel message serial port (McASP) that a group system is controlled dedicated serial port and reached 16 serial devices and fifo buffer, in addition more comprise two external memory interfaces: 8 external asynchronous memory interfaces (EMIFA) and the applicable high speed 16 bit synchronization external memory interfaces (EMIFB) of SDRAM that NAND/NOR flash memory is applicable.
The low power dissipation design of front-collection unit has reduced the energy consumption of electric battery, extended power-on time, avoided external power source to be linked into high-pressure side, equipment and the personal safety of test have been increased, by optical fiber communication, receive the clock signal that rearmounted processing unit sends over, each sampled value is all stamped to markers, and with serial protocol, sampled value is sent to rearmounted processing unit by optical fiber interface.
Described rearmounted processing unit comprises the first fiber optical transceiver, the second fiber optical transceiver, FPGA, clock module and PowerPC primary processor, the standard source signal sampling value that described the first fiber optical transceiver sends for receiving front-collection unit, and send FPGA to; The measured signal sampled value that described the second fiber optical transceiver sends for receiving merge cells, and send FPGA to; Described clock module carries out synchronized sampling for control criterion source signal and measured signal, be connected with FPGA, described FPGA receives for offset data the additive error that link is brought in time domain, and by the data after time domain compensation, send PowerPC primary processor to, carrying out data record ripple and error calculates, FPGA selects the XC3S1000 chip of xilinx company, the sampled value of the measured signal that merge cells (MU) sends, by FPGA, stamped markers, the capability of sequential control that FPGA is good, has greatly reduced the additive error that data receiver link is brought in time domain; PowerPC primary processor is selected the MPC8247 embedded microprocessor of Freescale company, adopt embedded real-time operating system vxworks, adopt ANSI C procedural language to write application program, the real time data that can guarantee to greatest extent system receives, Sudden Changing Rate is differentiated, and data record ripple and error are calculated.
Described rearmounted processing unit also comprises man-machine interface, described man-machine interface is connected with PowerPC primary processor, described man-machine interface comprises high-resolution color LCD display, be used for the graphical drafting of data, error parameter shows, shape library WindML based on vxworks carries out the exploitation of interface and interactive software, WindML provides basic figure, video, audion technic, display mode setting is provided, standard input output is controlled, the functions such as point-line-surface mapping, and provide the framework of a design standards device driver, provide a series of instruments to be used for processing input equipment and process event.
The detection method of the transient characterisitics detection system of the electronic type voltage transformer based on above-mentioned, comprises the following steps,
Step (1), according to formula (1), determines primary side high voltage U
1the output voltage U of power supply
1,
Wherein, U
pfor primary side high voltage U
1the effective value of fundametal compoment, f is fundamental frequency,
for starting phase angle, U
dcfor DC component, U
res(t) be residual voltage component.
Step (2), by controlling relay protection condition simulation unit, control tested electronic type voltage transformer and enter the relay protection of primary side short circuit or the relay protection that circuit band is detained electric charge reclosing, method is closed second switch CB2, control the first switch CB1 by being disconnected to closure, making the voltage of tested electronic type voltage transformer primary side reduce to zero, is the relay protection of primary side short circuit; Disconnect the first switch CB1, control second switch CB2 at primary side high voltage U
1positive peak place by being closed into disconnection, at primary side high voltage U
1negative peak place by being disconnected to closure, be that circuit band is detained the relay protection of electric charge reclosing.
The specified phase deviation of step (3) to measured signal
with specified delay time t
drevised, each sampled value of measured signal is carried out to time calibrating, and markers correction
f wherein
rfor the rated frequency value of tested electronic type voltage transformer, thereby make revised measured signal sampled value synchronize and process by markers with standard source signal sampling value;
Step (4) catches mutation voltage Δ u by transient detection, and mutation voltage Δ u is formula (2),
Δu＝|u(t)-u(t-2T)| （2）
Wherein, t is current time, and T is a power frequency cycle time, and u (t) is current instantaneous voltage.
Step (5), when Δ u>Uset, Uset is threshold voltage, Uset=0.4U
p, be judged to be transient state initial;
Step (6) is if the relay protection of primary side short circuit is searched for the magnitude of voltage U of the previous cycle measured signal of transient state initial time
testpeak value U
max, and to instantaneous voltage and 0.1U after transient state initial time one cycle
maxcarry out amplitude judgement, whether qualified to judge the transient characterisitics of primary side short circuit, if the instantaneous voltage after transient state initial time one cycle is greater than 0.1U
max, the transient characterisitics of primary side short circuit are qualified.
Step (7) is if circuit band is detained the relay protection of electric charge reclosing, two cycles from transient state initial time start, whether the instantaneous voltage error ε of calculating in two to three cycle time windows is greater than 10%, whether the instantaneous voltage error ε in three to four half cycles time windows is greater than 5%, whether qualified to judge the transient characterisitics of circuit band delay electric charge reclosing, if the instantaneous voltage error ε in two to three cycle time windows is greater than 10%, instantaneous voltage error ε in three to four half cycles time windows is greater than 5%, and the transient characterisitics that circuit band is detained electric charge reclosing are qualified, the method of wherein calculating instantaneous voltage error ε is,
(1) error voltage U
e=U
test-U
ref, U wherein
testfor the magnitude of voltage of measured signal, U
refmagnitude of voltage for standard source signal;
(2) by formula (3), obtain instantaneous voltage error ε, formula (3) is as follows,
Wherein, U
pfor primary side high voltage U
1the effective value of fundametal compoment.
More than show and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. the transient characterisitics detection system of an electronic type voltage transformer, it is characterized in that: comprise relay protection condition simulation unit, high frequency voltage divider, merge cells and transient characterisitics detecting unit, the primary side high voltage U of described relay protection condition simulation unit output
1provide test different electric pressures used to tested electronic type voltage transformer, primary side high voltage U
1also by high frequency voltage divider, be converted into low-voltage, as the standard source signal U of transient characterisitics detecting unit
2tested electronic type voltage transformer and high frequency voltage divider are in parallel, and be together in parallel with relay protection condition simulation unit, the sampled value of tested electronic type voltage transformer sends to transient characterisitics detecting unit by the optical fiber interface of merge cells, as the measured signal of transient characterisitics detecting unit.
2. the transient characterisitics detection system of electronic type voltage transformer according to claim 1, is characterized in that: described relay protection condition simulation unit comprises the primary side high voltage U of output
1power supply, the first switch CB1 and second switch CB2, described the first switch CB1 is connected in parallel on the two ends of power supply, connect with the positive pole of power supply in one end of described second switch CB2, the other end is the primary side high voltage U of relay protection condition simulation unit
1output terminal, wherein resistance R g is current-limiting resistance.
3. the transient characterisitics detection system of electronic type voltage transformer according to claim 1, is characterized in that: described transient characterisitics detecting unit comprises
Be positioned on high-tension side front-collection unit, for sampling and processing standard source signal, and send rearmounted processing unit to;
Be positioned at the rearmounted processing unit of low-pressure side, for receiving the standard source signal of measured signal and the collection of front-collection unit, and catch the Sudden Changing Rate of relay protection, carry out data record ripple and error and calculate;
Between described front-collection unit and rearmounted processing unit by optical fiber communication, described rearmounted processing unit also by optical fiber be positioned on high-tension side merge cells and communicate, all adopt IEC61850-9-1, IEC61850-9-2 or FT3 communication protocol.
4. the transient characterisitics detection system of electronic type voltage transformer according to claim 3, it is characterized in that: described front-collection unit comprises dsp processor, electric pressure converter, signal conditioning circuit, ADC Acquisition Circuit, electric battery, optical transmitter and optical receiver described standard source signal U
2by electric pressure converter, be connected with signal conditioning circuit, described signal conditioning circuit is also connected with dsp processor by ADC Acquisition Circuit, described dsp processor sends to rearmounted processing unit by optical transmitter by the standard source signal data of collection, described dsp processor receives by optical receiver the clock sync signal that rearmounted processing unit sends, and send clock sync signal to ADC Acquisition Circuit, control collection period, described electric battery is used for improving operating voltage.
5. the transient characterisitics detection system of electronic type voltage transformer according to claim 4, is characterized in that: described signal conditioning circuit is provided with the low-pass filter circuit that cutoff frequency is not less than 20kHz; The AD chip of described ADC Acquisition Circuit is 24 high-speed sampling chips.
6. the transient characterisitics detection system of electronic type voltage transformer according to claim 3, it is characterized in that: described rearmounted processing unit comprises the first fiber optical transceiver, the second fiber optical transceiver, FPGA, clock module and PowerPC primary processor, the standard source signal sampling value that described the first fiber optical transceiver sends for receiving front-collection unit, and send FPGA to; The measured signal sampled value that described the second fiber optical transceiver sends for receiving merge cells, and send FPGA to; Described clock module carries out synchronized sampling for control criterion source signal and measured signal, be connected with FPGA, described FPGA receives for offset data the additive error that link is brought in time domain, and by the data after time domain compensation, send PowerPC primary processor to, carry out data record ripple and error and calculate.
7. the transient characterisitics detection system of electronic type voltage transformer according to claim 6, it is characterized in that: described rearmounted processing unit also comprises man-machine interface, described man-machine interface is connected with PowerPC primary processor, described man-machine interface comprises high-resolution color LCD display, for completing graphical drafting, the error parameter of data, shows.
8. the detection method of the transient characterisitics detection system of electronic type voltage transformer according to claim 1, is characterized in that: comprises the following steps,
Step (1), according to formula (1), determines primary side high voltage U
1the output voltage U of power supply
1,
Wherein, U
pfor primary side high voltage U
1the effective value of fundametal compoment, f is fundamental frequency,
for starting phase angle, U
dcfor DC component, U
res(t) be residual voltage component.
Step (2), by controlling relay protection condition simulation unit, controls tested electronic type voltage transformer and enters the relay protection of primary side short circuit or the relay protection that circuit band is detained electric charge reclosing;
The specified phase deviation of step (3) to measured signal
with specified delay time t
drevised, each sampled value of measured signal is carried out to time calibrating, and markers correction
f wherein
rfor the rated frequency value of tested electronic type voltage transformer, thereby make revised measured signal sampled value synchronize and process by markers with standard source signal sampling value;
Step (4) catches mutation voltage Δ u by transient detection, and mutation voltage Δ u is formula (2),
Wherein, t is current time, and T is a power frequency cycle time, and u (t) is current instantaneous voltage;
Step (5), when Δ u>Uset, Uset is threshold voltage, Uset=0.4U
p, be judged to be transient state initial;
Step (6) is if the relay protection of primary side short circuit is searched for the magnitude of voltage U of the previous cycle measured signal of transient state initial time
testpeak value U
max, and to instantaneous voltage and 0.1U after transient state initial time one cycle
maxcarry out amplitude judgement, whether qualified to judge the transient characterisitics of primary side short circuit, if the instantaneous voltage after transient state initial time one cycle is greater than 0.1U
max, the transient characterisitics of primary side short circuit are qualified.
Step (7) is if circuit band is detained the relay protection of electric charge reclosing, two cycles from transient state initial time start, whether the instantaneous voltage error ε of calculating in two to three cycle time windows is greater than 10%, whether the instantaneous voltage error ε in three to four half cycles time windows is greater than 5%, whether qualified to judge the transient characterisitics of circuit band delay electric charge reclosing, if the instantaneous voltage error ε in two to three cycle time windows is greater than 10%, instantaneous voltage error ε in three to four half cycles time windows is greater than 5%, and the transient characterisitics that circuit band is detained electric charge reclosing are qualified.
9. the transient characterisitics detection system of electronic type voltage transformer according to claim 1, it is characterized in that: step (2), by controlling relay protection condition simulation unit, controlling tested electronic type voltage transformer, to enter the method that the relay protection of primary side short circuit or circuit band be detained the relay protection of electric charge reclosing be closed second switch CB2, control the first switch CB1 by being disconnected to closure, making the voltage of tested electronic type voltage transformer primary side reduce to zero, is the relay protection of primary side short circuit; Disconnect the first switch CB1, control second switch CB2 at primary side high voltage U
1positive peak place by being closed into disconnection, at primary side high voltage U
1negative peak place by being disconnected to closure, be that circuit band is detained the relay protection of electric charge reclosing.
10. the transient characterisitics detection system of electronic type voltage transformer according to claim 1, is characterized in that: the method for calculating instantaneous voltage error ε is,
(1) error voltage U
e=U
test-U
ref, U wherein
testfor the magnitude of voltage of measured signal, U
refmagnitude of voltage for standard source signal;
(2) by formula (3), obtain instantaneous voltage error ε, formula (3) is as follows,
Wherein, U
pfor primary side high voltage U
1the effective value of fundametal compoment.
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| CN110018435A (en) * | 2019-02-21 | 2019-07-16 | 国网山东省电力公司临沂供电公司 | Electronic mutual inductor calibration system and calibration method |
| CN111751604A (en) * | 2020-07-01 | 2020-10-09 | 国网江苏省电力有限公司营销服务中心 | Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider |
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