CN102780212A - Single-phase grounding traveling-wave protection device for distribution line - Google Patents
Single-phase grounding traveling-wave protection device for distribution line Download PDFInfo
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Abstract
The invention provides a single-phase grounding traveling-wave protection device for a distribution line, which comprises at least one convertor inserted on a circuit substrate, a protector, a monitor and an outlet relay, wherein the convertor is used for traveling-wave signal input and power frequency signal input, and a zero-mode current traveling-wave signal, a zero-mode voltage traveling-wave signal, a power frequency current signal and a power frequency voltage signal can be obtained; the protector comprises a traveling-wave module and a power frequency module; the traveling-wave module can obtain a zero-mode current traveling wave and a zero-mode voltage traveling wave under the line frequency range of 0-100KHz; meanwhile, according to the polarity of the zero-mode current traveling wave and the zero-mode voltage traveling wave, a protection criterion is formed; the power frequency module can be used for obtaining three-phase current and zero-sequence voltage for protecting a traveling-wave module from erroneous judgement; meanwhile, the device is locked when interphase faults are caused; and the outlet relay can give a tripping signal or an alarm signal according to the requirement. According to the technical scheme disclosed by the invention, when a neutral point non-effective grounding system of the distribution line is subjected to single-phase grounding faults, the faults can be quickly and accurately detected, and reliable protection action can be performed.
Description
Technical field
The present invention relates to protecting electrical power system and control technology, concrete, relate to a kind of distribution line single-phase earthing traveling-wave protection device.
Background technology
Behind the system with non effectively earth ed neutral distribution line generation single phase ground fault, can only constitute the loop through direct-to-ground capacitance, fault current is very little.Can't action message under this failure condition based on the overcurrent protection of traditional power frequency electric parameters, distance protection etc.The single-phase earthing traveling-wave protection is not owing to react the fault steady-state process, and after single phase ground fault took place, the polar relationship of voltage traveling wave and current traveling wave was all reliably set up in any earth neutral system, therefore can become the effective means that addresses this problem.The realization of protective device also becomes the key that addresses this problem.
The development of traveling-wave protection device is paid close attention to by Chinese scholars always.As far back as eighties of last century seventies, first capable ripple high-frequency orientation protector (traveling-wave protection of RALDA type) just succeeded in developing abroad.China introduces two cover RALDA type protections at the initial stage eighties from Sweden, and installs at distant line of brocade and Pingwu line respectively.But in fact RALDA type protection sample rate is merely 10KHz, can't effectively obtain travelling wave signal, lacks the mathematical measure that signal is effectively handled simultaneously, and final RALDA type protection ends in failure.The development of traveling-wave protection device subsequently is absorbed in low ebb.Because traveling-wave protection need be obtained the capable ripple of high frequency after the fault, so protective device need have high-speed data and obtains function; Hardware circuit should have stronger interference free performance simultaneously.In addition, under the situation of high sampling rate, data volume is bigger, and therefore also claimed apparatus has stronger Digital Signal Processing function.Along with the development of modern technologies, comprehensive utilization high speed digital signal processor (DSP) and complex programmable logic element (CPLD) are generally believed it is on hardware, to realize the effective means that travelling wave signal obtains and handles.
In addition; In order to solve the low problem of traveling-wave protection reliability, device need have also that power frequency component obtains and processing capacity, when guaranteeing to be expert at ripple protection module generation error starting; Give locking through power-frequency voltage, distinguish single phase ground fault and double earthfault through power current simultaneously.
Therefore; Need a kind of single-phase earthing traveling-wave protection device that is applicable to distribution line; Can obtain and handle travelling wave signal and power frequency component simultaneously, the other types fault takes place or reliable locking during with bus All other routes fault in action message when circuit generation single phase ground fault simultaneously.Cause the defective that the traditional protection device is insensitive or lost efficacy because of the single phase ground fault phenomenon is not obvious thereby overcome system with non effectively earth ed neutral, improve sensitivity and reliability that single phase ground fault detects.
Summary of the invention
The present invention just is being based on the problems referred to above; A kind of distribution line one-phase ground protection device has been proposed; Can obtain and handle travelling wave signal and power frequency component simultaneously; When system with non effectively earth ed neutral generation single phase ground fault, can accurately and fast detect fault, and make the protection action of response.
In view of this, the present invention proposes a kind of distribution line single-phase earthing traveling-wave protection device, comprise at least one converter, protector, watch-dog and the exit relay that are inserted on the circuit substrate; Said converter will convert secondary side current signal and secondary side voltage signal into from current signal on the loop to be measured and voltage signal; Wherein, said converter comprises travelling wave signal input and power frequency component input, can obtain zero mould current traveling wave signal, zero mode voltage travelling wave signal, power current signal and power-frequency voltage signal; Said secondary side current and secondary side voltage signal that said protector acceptance is converted to from said converter; And signal handled; Execute protection algorithm then; And then judge whether said loop to be measured single phase ground fault takes place, if break down, then export the result to said watch-dog and said exit relay; Said watch-dog is connected to said protector, shows and store the fault message of said protector transmission, demonstration and the definite value of setting to said protector transmission user, and the running status that detects said protector; Said exit relay is connected to said protector, receives the result of determination of said traveling-wave protection device, determines whether to send trip signal or alarm command according to said result of determination.
In such scheme, preferably, said protector comprises capable mode piece and power frequency module; Wherein, said capable mode piece is used for travelling wave signal is obtained and handles, and said power frequency module is used for power frequency component is obtained and handles.
In such scheme, preferably, said capable mode piece comprises that capable wave datum is obtained the loop, the row ripple starts loop and travelling wave signal treatment loop; Wherein said capable wave datum is obtained the loop can be with the sampling rate of 200KHz, and obtaining zero mould current traveling wave and the frequency range that said loop to be measured medium frequency scope is 0 ~ 100kHz in real time is the zero mode voltage row ripple of 0 ~ 100kHz; Said capable wave datum is obtained the loop and is obtained the loop and comprise second order active low-pass filter module, multicircuit switch module, A/D modular converter and dual port RAM module; Wherein, The free transmission range of said second order active low-pass filter module is 0 ~ 100KHz; Said secondary side current signal and secondary side voltage signal are carried out filtering, and said secondary side current signal and said secondary side voltage signal comprise zero mould current traveling wave signal and zero mode voltage travelling wave signal; Said multicircuit switch module is connected to said second order active low-pass filter module, is used for exporting said zero mould current traveling wave signal and zero mode voltage travelling wave signal to said A/D modular converter successively; Said A/D modular converter is connected to said multicircuit switch module; Said capable mode analog signal is carried out the A/D conversion; Every road signal A/D switching rate is 200KHz; After the A/D conversion, obtain the digital signal of zero mould current traveling wave signal and zero mode voltage travelling wave signal, and transformation result is transferred to the dual port RAM module; Said dual port RAM module; Have two groups of data/address buss and two group address buses; Be used to store, and read the digital signal transformation result of said zero mould current traveling wave signal and zero mode voltage travelling wave signal by the travelling wave signal treatment loop from the said zero mould current traveling wave signal of said A/D modular converter and the digital signal transformation result of zero mode voltage travelling wave signal; Said capable ripple starts the loop, comprises active bandpass filtering modules block of second order and voltage comparison module; The free transmission range of the active bandpass filtering modules block of said second order is 500Hz ~ 3KHz, and the component that can obtain 500Hz ~ 3KHz in the zero mould current traveling wave signal is as the signal that is used to start judgement; Said voltage comparison module is connected to said second order active low-pass filter module; Reception is from the said signal that is used to start judgement of the active bandpass filtering modules block of said second order; And confirm whether the said signal amplitude that is used to start judgement is higher than first predetermined amplitude; When the said signal amplitude that is used to start judgement is higher than said first predetermined amplitude, send enabling signal to said travelling wave signal treatment loop; Said travelling wave signal treatment loop comprises data acquisition module, wavelet transformation module, fault distinguishing module and power frequency communication module; So said data acquisition module receives the enabling signal from said voltage comparison module, and from said dual port RAM, reads the digital signal of zero mould current traveling wave signal and zero mode voltage travelling wave signal; Said wavelet transformation module; Said zero mould current traveling wave digital signal to said data acquisition module obtains is carried out wavelet transformation with zero mode voltage row wave number word signal; Obtain the polarity of the modulus maximum and the modulus maximum of wavelet transformation, and obtain the wave head polarity of zero mould current traveling wave and zero mode voltage row ripple according to the polarity of said modulus maximum; Said fault initiating discrimination module; The said zero mould current traveling wave that said wavelet transformation module is obtained and the wave head polarity of zero mode voltage row ripple compare, if polarity is identical, and the said protective device of involution then; If polarity is opposite, then start said power frequency communication module.Said power frequency communication module if receive the enabling signal of said fault initiating discrimination module, then with the power frequency module communication, starts said power frequency module.
In such scheme, preferably, said wavelet transformation decomposes said zero mould current traveling wave digital signal with following form:
Wherein, I (n) is said zero mould current traveling wave digital signal;
approaches coefficient for the small echo of said zero mould current traveling wave digital signal i (n),
be the wavelet conversion coefficient of said zero mould current traveling wave digital signal i (n).
Through after the said dyadic wavelet transform, said zero mode voltage row wave number word signal decomposition is become following form:
Wherein, U (n) is said voltage traveling wave digital signal;
approaches coefficient for the small echo of said zero mode voltage row wave number word signal u (n),
be the wavelet conversion coefficient of said zero mode voltage row wave number word signal u (n).
Said dyadic wavelet transform adopts the derived function of three subcenter B-spline functions as wavelet function, wavelet coefficient Xu Lie ﹛ hk ﹜
K ∈ z， ﹛ gk ﹜
K ∈ zFor:
﹛h
k﹜
k∈z=（0.125，0.375，0.375，0.125）（k=-1，0，1，2），﹛g
k﹜
k∈z=（-2，2）（k=0，1）。
In such scheme, preferably, said wavelet transformation modulus maximum is defined as: for any given positive number ε; 0, when satisfying | n-n
0|<during ε, to n ≠ n arbitrarily
0, have
Set up,
Be the wavelet transformation modulus maximum of said zero mould current traveling wave, it is positive and negative to be the wavelet transformation modulus maximum polarity of said zero mould current traveling wave; For any given positive number ε＞0, when satisfying | n-n
0|<during ε, to n ≠ n arbitrarily
0, have
Set up,
Be the wavelet transformation modulus maximum of said zero mode voltage row ripple, it is positive and negative to be the wavelet transformation modulus maximum polarity of said zero mode voltage row ripple.
In such scheme, preferably, said power frequency module comprises that the power frequency data obtain loop and power frequency component treatment loop; Wherein, said power frequency data are obtained the loop and are comprised second order active low-pass filter module, multicircuit switch module and A/D modular converter; Wherein, said second order active low-pass filter module cut-off frequency is 1.2KHz, and said secondary side voltage signal is carried out filtering, and said secondary side voltage signal comprises three-phase current signal and residual voltage signal; Said multicircuit switch module is connected to said second order active low-pass filter module, is used for said three-phase current signal and residual voltage signal are transferred to the A/D modular converter successively; Said A/D modular converter is connected to said multicircuit switch module; Said three-phase current signal and residual voltage signal are carried out the A/D conversion; Obtain three-phase current digital signal and residual voltage digital signal; Every road A/D switching rate is 2.4KHz, and transformation result is transferred to said power frequency component treatment loop; Said power frequency component treatment loop comprises that Fourier transform module, residual voltage determination module, phase current determination module and signal leave module; Wherein, said Fourier transform module is carried out Fourier transform with three-phase current digital signal and residual voltage digital signal, obtains three-phase current amplitude and residual voltage amplitude; Said residual voltage determination module compares the said residual voltage amplitude and first predetermined amplitude, if said residual voltage amplitude then starts the phase current determination module greater than said first predetermined amplitude, otherwise the protective device involution; Said phase current determination module compares the said three-phase current amplitude and second predetermined amplitude, if said three-phase current amplitude all less than said second predetermined amplitude, then enabling signal is left module, otherwise the protective device involution; Said signal is left module and is set according to the user, can provide trip signal or alarm signal, and signal is transferred to said exit relay.
Description of drawings
Fig. 1 shows the block diagram of distribution line single-phase earthing traveling-wave protection device according to an embodiment of the invention;
Fig. 2 shows the hardware structure diagram of protection module according to an embodiment of the invention;
Fig. 3 shows protection module software flow pattern according to an embodiment of the invention.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with accompanying drawing and embodiment.
Set forth a lot of details in the following description so that make much of the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to following disclosed specific embodiment.
Fig. 1 shows the block diagram of distribution line single-phase earthing traveling-wave protection device according to an embodiment of the invention.
As shown in Figure 1, distribution line single-phase earthing traveling-wave protection device according to the present invention comprises at least one converter, protector, watch-dog and the exit relay that is inserted on the circuit substrate; Said converter will convert secondary side current signal and secondary side voltage signal into from current signal on the loop to be measured and voltage signal; Wherein, said converter comprises travelling wave signal input and power frequency component input, can obtain zero mould current traveling wave signal, zero mode voltage travelling wave signal, power current signal and power-frequency voltage signal; Said secondary side current and secondary side voltage signal that said protector acceptance is converted to from said converter; And signal handled; Execute protection algorithm then; And then judge whether said loop to be measured single phase ground fault takes place, if break down, then export the result to said watch-dog and said exit relay; Said watch-dog is connected to said protector, shows and store the fault message of said protector transmission, demonstration and the definite value of setting to said protector transmission user, and the running status that detects said protector; Said exit relay is connected to said protector, receives the result of determination of said traveling-wave protection device, determines whether to send trip signal or alarm command according to said result of determination.
In such scheme, preferably, said protector comprises capable mode piece and power frequency module; Wherein, said capable mode piece is used for travelling wave signal is obtained and handles, and said power frequency module is used for power frequency component is obtained and handles.
In such scheme, preferably, said capable mode piece comprises that capable wave datum is obtained the loop, the row ripple starts loop and travelling wave signal treatment loop; Wherein said capable wave datum is obtained the loop can be with the sampling rate of 200KHz, and obtaining zero mould current traveling wave and the frequency range that said loop to be measured medium frequency scope is 0 ~ 100kHz in real time is the zero mode voltage row ripple of 0 ~ 100kHz; Said capable wave datum is obtained the loop and is obtained the loop and comprise second order active low-pass filter module, multicircuit switch module, A/D modular converter and dual port RAM module; Wherein, The free transmission range of said second order active low-pass filter module is 0 ~ 100KHz; Said secondary side current signal and secondary side voltage signal are carried out filtering, and said secondary side current signal and said secondary side voltage signal comprise zero mould current traveling wave signal and zero mode voltage travelling wave signal; Said multicircuit switch module is connected to said second order active low-pass filter module, is used for exporting said zero mould current traveling wave signal and zero mode voltage travelling wave signal to said A/D modular converter successively; Said A/D modular converter is connected to said multicircuit switch module; Said capable mode analog signal is carried out the A/D conversion; Every road signal A/D switching rate is 200KHz; After the A/D conversion, obtain the digital signal of zero mould current traveling wave signal and zero mode voltage travelling wave signal, and transformation result is transferred to the dual port RAM module; Said dual port RAM module; Have two groups of data/address buss and two group address buses; Be used to store, and read the digital signal transformation result of said zero mould current traveling wave signal and zero mode voltage travelling wave signal by the travelling wave signal treatment loop from the said zero mould current traveling wave signal of said A/D modular converter and the digital signal transformation result of zero mode voltage travelling wave signal; Said capable ripple starts the loop, comprises active bandpass filtering modules block of second order and voltage comparison module; The free transmission range of the active bandpass filtering modules block of said second order is 500Hz ~ 3KHz, and the component that can obtain 500Hz ~ 3KHz in the zero mould current traveling wave signal is as the signal that is used to start judgement; Said voltage comparison module is connected to said second order active low-pass filter module; Reception is from the said signal that is used to start judgement of the active bandpass filtering modules block of said second order; And confirm whether the said signal amplitude that is used to start judgement is higher than first predetermined amplitude; When the said signal amplitude that is used to start judgement is higher than said first predetermined amplitude, send enabling signal to said travelling wave signal treatment loop; Said travelling wave signal treatment loop comprises data acquisition module, wavelet transformation module, fault distinguishing module and power frequency communication module; So said data acquisition module receives the enabling signal from said voltage comparison module, and from said dual port RAM, reads the digital signal of zero mould current traveling wave signal and zero mode voltage travelling wave signal; Said wavelet transformation module; Said zero mould current traveling wave digital signal to said data acquisition module obtains is carried out wavelet transformation with zero mode voltage row wave number word signal; Obtain the polarity of the modulus maximum and the modulus maximum of wavelet transformation, and obtain the wave head polarity of zero mould current traveling wave and zero mode voltage row ripple according to the polarity of said modulus maximum; Said fault initiating discrimination module; The said zero mould current traveling wave that said wavelet transformation module is obtained and the wave head polarity of zero mode voltage row ripple compare, if polarity is identical, and the said protective device of involution then; If polarity is opposite, then start said power frequency communication module.Said power frequency communication module if receive the enabling signal of said fault initiating discrimination module, then with the power frequency module communication, starts said power frequency module.
In such scheme, preferably, said power frequency module comprises that the power frequency data obtain loop and power frequency component treatment loop; Wherein, said power frequency data are obtained the loop and are comprised second order active low-pass filter module, multicircuit switch module and A/D modular converter; Wherein, said second order active low-pass filter module passband is 0 ~ 1.2KHz, and said secondary side voltage signal is carried out filtering, and said secondary side voltage signal comprises three-phase current signal and residual voltage signal; Said multicircuit switch module is connected to said second order active low-pass filter module, is used for said three-phase current signal and residual voltage signal are transferred to the A/D modular converter successively; Said A/D modular converter is connected to said multicircuit switch module; Said three-phase current signal and residual voltage signal are carried out the A/D conversion; Obtain three-phase current digital signal and residual voltage digital signal; Every road A/D switching rate is 2.4KHz, and transformation result is transferred to said power frequency component treatment loop; Said power frequency component treatment loop comprises that Fourier transform module, residual voltage determination module, phase current determination module and signal leave module; Wherein, said Fourier transform module is carried out Fourier transform with three-phase current digital signal and residual voltage digital signal, obtains three-phase current amplitude and residual voltage amplitude; Said residual voltage determination module compares the said residual voltage amplitude and first predetermined amplitude, if said residual voltage amplitude then starts the phase current determination module greater than said first predetermined amplitude, otherwise the protective device involution; Said phase current determination module compares the said three-phase current amplitude and second predetermined amplitude, if said three-phase current amplitude all less than said second predetermined amplitude, then enabling signal is left module, otherwise the protective device involution; Said signal is left module and is set according to the user, can provide trip signal or alarm signal, and signal is transferred to said exit relay.
Fig. 2 shows the hardware structure diagram of protection module according to an embodiment of the invention;
As shown in Figure 2; Zero mould current traveling wave signal at first gets into second order active low-pass filter module after getting into protector with zero mode voltage travelling wave signal, and the cut-off frequency of this second order active low-pass filter module is 100kHz; Major function is the filtering High-frequency Interference, prevents frequency alias simultaneously.Multicircuit switch MAX4639 can realize the alternative high speed diverter switch of zero mould current traveling wave signal and zero mode voltage travelling wave signal; Export the two-way analog signal to the A/D modular converter successively; Adopt 1 AD9240 high speed A switch to realize high speed A in the A/D modular converter, the data sampling rate of each road analog signal is reached 200KHz analog signal.Dual port RAM IDT7028 is used to store 2 way word signals after the A/D conversion is changed, and memory space is 128Kbyte.
In addition; Zero mould current traveling wave signal is after process second order active low-pass filter module; Also get into the active bandpass filtering modules block of second order; The logical frequency of the band of the active bandpass filtering modules block of second order is 500Hz ~ 3kHz, extracts the signal of 500Hz ~ 3kHz in the capable ripple of current failure, as the enabling signal of traveling-wave protection hardware.After the active bandpass filtering modules block of second order; Signal gets into one through operational amplifier formation level comparison loop; After the signal level of 500Hz ~ 3kHz in the capable ripple of current failure behind the process band pass filter surpasses preset hardware-initiated level; The capable ripple of hardware starts the loop and sends enabling signal to CPLD EMP7128S, and CPLD EMP7128S triggers high speed digital signal processor TMS320C6713 and interrupts, and begins to carry out capable ripple criterion.
CPLD EMP7128S is that the row wave datum is obtained the core control section in loop; It is realized the coordination control of multicircuit switch module, A/D modular converter and dual port RAM module and the decoding of address/data signal; And then realize analog signal conversion is become in digital signal and storage and the dual port RAM IDT7028 module, while CPLD EMP7128S triggers high speed digital signal processor TMS320C6713 in the hardware-initiated back of traveling-wave protection and begins to carry out capable ripple criterion.
Row ripple criterion is that core is accomplished with DSP TMS320C6713; This is a high-speed digital signal process chip, and 32 of data/address buss can carry out floating-point operation; Precision is high; Chip internal has 8 arithmetic elements, and per second can be carried out 1,600,000,000 instructions, can satisfy the requirement of ultrahigh speed traveling-wave protection to data processing speed and precision simultaneously.When the capable ripple criterion of the exception handles among the DSP TMS320C6713 was met, DSP sent to processor MCF5282 through interrupt signal, carries out the processing of power frequency criterion.
The three-phase current analog signal at first gets into second order active low-pass filter module after getting into protector, and the cut-off frequency of this second order active low-pass filter module is 1.2KHz, and major function is the filtering High-frequency Interference, prevents frequency alias simultaneously.Adopt 1 MAX125 mould/number conversion chip in the A/D modular converter, the built-in chip type high-speed analog switch can be realized the high speed A to multichannel analog signals, is 2.4KHz to the data sampling rate of each road analog signal.Storage after the sampling is in the internal RAM of MCF5282.After MCF5282 receives the DSP interrupt signal, begin to carry out the power frequency criterion.When the power frequency criterion satisfied, MCF5282 control was left module and is provided outlet information, and the action of operation exit relay.
Fig. 3 shows protection module software flow pattern according to an embodiment of the invention.
As shown in Figure 3, after receiving capable ripple enabling signal:
Directly obtain the zero mould current traveling wave in said loop to be measured, the zero mould current traveling wave that is obtained carried out dyadic wavelet transform,, zero mould current traveling wave is resolved into following form through after the dyadic wavelet transform:
Wherein,
for the small echo of current traveling wave approaches coefficient,
is the wavelet conversion coefficient of zero mould current traveling wave.Ask for current traveling wave wavelet transformation modulus maximum according to wavelet conversion coefficient, modulus maximum is defined as: for any given positive number ε＞0, when satisfying | n-n
0|<during ε, to n ≠ n arbitrarily
0, have
Set up,
It is zero mould current traveling wave wavelet transformation modulus maximum; Utilize the polarity of the positive negative indication zero mould current traveling wave of zero mould current traveling wave wavelet transformation modulus maximum;
Directly obtain the zero mode voltage row ripple in said loop to be measured, the zero mode voltage row ripple that is obtained carried out dyadic wavelet transform,, zero mode voltage row ripple is resolved into following form through after the dyadic wavelet transform:
Wherein,
is that the small echo of zero mode voltage row ripple approaches coefficient, and
is the wavelet conversion coefficient of zero mode voltage row ripple.Ask for zero mode voltage row ripple wavelet transformation modulus maximum according to wavelet conversion coefficient, modulus maximum is defined as: for any given positive number ε＞0, when satisfying | n-n
0|<during ε, to n ≠ n arbitrarily
0, have
Set up,
It is zero mode voltage row ripple wavelet transformation modulus maximum; Utilize the polarity of the positive negative indication voltage traveling wave of zero mode voltage row ripple wavelet transformation modulus maximum.
In such scheme, dyadic wavelet transform adopts the derived function of three subcenter B-spline functions as wavelet function, wavelet coefficient Xu Lie ﹛ h
k﹜
K ∈ z， ﹛ g
k﹜
K ∈ zFor:
﹛h
k﹜
k∈z=（0.125，0.375，0.375，0.125）（k=-1，0，1，2），﹛g
k﹜
k∈z=（-2，2）（k=0，1）。
With positive and negative the comparing of zero mode voltage row ripple and zero mould current traveling wave wavelet transformation modulus maximum, under both opposite polarity situation, start protection power frequency module; Otherwise protection involution.
Meanwhile, directly obtain three-phase current and residual voltage power frequency component.Under the situation that protection power frequency module starts, utilize Fourier transform to ask for three-phase current and residual voltage amplitude.Utilize residual voltage amplitude and described first predetermined amplitude to compare, if the residual voltage amplitude greater than setting value, is then protected and carried out next step criterion; Otherwise protection involution.Subsequently the three-phase current amplitude and second predetermined amplitude are compared, if the three-phase current amplitude then is judged as single phase ground fault all less than second predetermined amplitude, enabling signal is left module, otherwise the said protective device of involution.
More than be described with reference to the accompanying drawings technical scheme of the present invention, considered in the correlation technique, the single phase ground fault phenomenon of system with non effectively earth ed neutral is not obvious; And cause the traditional protection method insensitive or lost efficacy; The traveling-wave protection reliability is lower, the present invention proposes a kind of distribution line single-phase earthing traveling-wave protection device, when distribution line system with non effectively earth ed neutral generation single phase ground fault; Can accurately and fast detect fault, and make action message.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a distribution line single-phase earthing traveling-wave protection device is characterized in that, comprises at least one converter, protector, watch-dog and the exit relay that are arranged on the circuit substrate;
Said converter will convert secondary side current signal and secondary side voltage signal into from current signal on the loop to be measured and voltage signal;
Said protector is accepted said secondary side current signal and said secondary side voltage signal; Then according to said secondary side current signal and said secondary side voltage signal; Obtain wave head polarity and the power current and the power-frequency voltage amplitude of zero mould current traveling wave and zero mode voltage row ripple; Judge according to said wave head polarity and said amplitude whether institute's protection circuit single phase ground fault takes place at last,, then transmit trip signal to said exit relay if single phase ground fault takes place; If single phase ground fault does not take place, the said distribution line one-phase ground protection of involution device then;
Said exit relay is connected to said protector, if receive said trip signal, then sends trip signal or alarm command.
2. distribution line single-phase earthing traveling-wave protection device according to claim 1; It is characterized in that current signal and voltage signal input that said converter is treated on the survey time road are changed, and obtain said secondary side current signal and said secondary side voltage signal; Wherein
Said secondary side current signal comprises: zero mould current traveling wave signal, power current signal; Said secondary side voltage signal comprises: zero mode voltage travelling wave signal, power-frequency voltage signal.
3. distribution line single-phase earthing traveling-wave protection device according to claim 1 is characterized in that, also comprises:
Watch-dog is connected to said protector, shows and store the fault message of said protector transmission, receives the also operation information of explicit user, and transmits said operation information to said protector, and the running status of monitoring said protector.
4. distribution line single-phase earthing traveling-wave protection device according to claim 1 is characterized in that said protector comprises capable mode piece and power frequency module; Wherein,
Said capable mode piece is used for travelling wave signal is handled, and said power frequency module is used for power frequency component is handled.
5. distribution line single-phase earthing traveling-wave protection device according to claim 4 is characterized in that, said capable mode piece comprises that capable wave datum is obtained the loop, the row ripple starts loop and travelling wave signal treatment loop; Wherein,
Said capable wave datum is obtained the loop, and to obtain zero mould current traveling wave signal and the frequency range that said converter medium frequency scope is 0 ~ 100kHz in real time be the zero mode voltage travelling wave signal of 0 ~ 100kHz; And said zero mould current traveling wave signal and said zero mode voltage travelling wave signal carried out filtering, transmission and A/D conversion;
Said startup loop obtains from said capable wave datum according to predetermined band and to extract the signal that is used to start judgement the output signal in loop, and judges whether to send enabling signal according to first predetermined amplitude;
Said travelling wave signal treatment loop; Receive said enabling signal and be that the zero mould current traveling wave signal of 0 ~ 100kHz and zero mode voltage travelling wave signal that frequency range is 0 ~ 100kHz carry out wavelet transformation the said frequency range that said capable wave datum is obtained the output in loop; To obtain the wave head polarity of zero mould current traveling wave and zero mode voltage row ripple; Judge then whether said zero mould current traveling wave is identical with the wave head polarity of said zero mode voltage row ripple; If identical, the said distribution line one-phase ground protection of involution device then; If inequality, then start the power frequency module.
6. distribution line single-phase earthing traveling-wave protection device according to claim 5 is characterized in that said capable wave datum is obtained the loop and specifically comprised: second order active low-pass filter module, multicircuit switch module, A/D modular converter and dual port RAM module; Wherein,
The free transmission range of said second order active low-pass filter module is 0 ~ 100kHz; Said zero mould current traveling wave signal and said zero mode voltage travelling wave signal are carried out filtering, and obtaining said frequency range is the zero mould current traveling wave signal of 0 ~ 100kHz and the zero mode voltage travelling wave signal that frequency range is 0 ~ 100kHz;
Said multicircuit switch module is connected to said second order active low-pass filter module, and being used for said frequency range is that the zero mould current traveling wave signal of 0 ~ 100kHz and zero mode voltage travelling wave signal that frequency range is 0 ~ 100kHz transfer to said A/D modular converter successively;
Said A/D modular converter is connected to said multicircuit switch module; To said frequency range is that the zero mould current traveling wave signal of 0 ~ 100kHz and zero mode voltage travelling wave signal that frequency range is 0 ~ 100kHz carry out the A/D conversion; Obtaining said frequency range is the zero mould current traveling wave digital signal of 0 ~ 100kHz and the zero mode voltage row wave number word signal that frequency range is 0 ~ 100kHz, then transformation result is transferred to the dual port RAM module;
Said dual port RAM module has two groups of data/address buss and two group address buses, is used to store the said transformation result from said A/D modular converter, and is read said transformation result by said travelling wave signal treatment loop.
7. distribution line single-phase earthing traveling-wave protection device according to claim 6 is characterized in that, said capable ripple starts the loop and specifically comprises: active bandpass filtering modules block of second order and voltage comparison module, wherein,
The active bandpass filtering modules block of said second order is connected to said second order active low-pass filter module, be used for from the frequency range of said second order active low-pass filter module output be the zero mould current traveling wave signal of 0 ~ 100kHz extract 500Hz ~ 3kHz component as the said signal that is used to start judgement;
Said voltage comparison module receives the said signal that is used to start judgement from the active bandpass filtering modules block of said second order; And judge whether the said amplitude that is used to start the signal of judgement is higher than said first predetermined amplitude; When the said amplitude that is used to start the signal of judgement is higher than said first predetermined amplitude, send enabling signal to said travelling wave signal treatment loop.
8. distribution line single-phase earthing traveling-wave protection device according to claim 7 is characterized in that said travelling wave signal treatment loop specifically comprises: data acquisition module, wavelet transformation module, fault initiating discrimination module and power frequency communication module, wherein,
Said data acquisition module receives the said enabling signal that starts the loop from said capable ripple, and obtains the loop from said capable wave datum and read the zero mode voltage row wave number word signal that zero mould current traveling wave digital signal that said frequency range is 0 ~ 100kHz and frequency range are 0 ~ 100kHz;
Said wavelet transformation module; To said frequency range is that the zero mould current traveling wave digital signal of 0 ~ 100kHz and zero mode voltage row wave number word signal that frequency range is 0 ~ 100kHz carry out wavelet transformation; Obtain polarity and second modulus maximum of said zero mode voltage row ripple and the polarity of second modulus maximum of first modulus maximum and first modulus maximum of said zero mould current traveling wave respectively; According to the polarity of said first modulus maximum and the polarity of said second modulus maximum, obtain first wave head polarity of said zero mould current traveling wave and the second wave head polarity of said zero mode voltage row ripple then;
Said fault initiating discrimination module compares said first wave head polarity and the said second wave head polarity, if the said first wave head polarity is identical with the said second wave head polarity, and the said distribution line one-phase ground protection of involution device then; If the said first wave head polarity is opposite with the said second wave head polarity, then start said power frequency communication module;
Said power frequency communication module if receive the enabling signal of said fault initiating discrimination module, then with the power frequency module communication, informs that said power frequency module protection starts.
9. distribution line single-phase earthing traveling-wave protection device according to claim 4 is characterized in that, said power frequency module comprises that the power frequency data obtain loop and power frequency component treatment loop, wherein,
Said power frequency data are obtained the loop said power current signal and said power-frequency voltage signal are carried out filtering, transmission and A/D conversion; Said power current signal comprises three-phase current signal, and said power-frequency voltage signal comprises the residual voltage signal;
Said power frequency component treatment loop is after said power frequency module protection starts; Said three-phase current signal and residual voltage signal are carried out Fourier transform; Obtain residual voltage signal amplitude and three-phase current signal amplitude, and judge, if said residual voltage signal amplitude is greater than first predetermined amplitude; And said three-phase current signal amplitude is all less than second predetermined amplitude; Then provide trip signal or alarm signal, and signal is transferred to said exit relay, otherwise the said distribution line one-phase ground protection of involution device.
10. distribution line single-phase earthing traveling-wave protection device according to claim 9 is characterized in that said power frequency data are obtained the loop and specifically comprised: second order active low-pass filter module, and multicircuit switch module and A/D modular converter, wherein,
Said second order active low-pass filter module is carried out filtering to said three-phase current signal and residual voltage signal;
Said multicircuit switch module is connected to said second order active low-pass filter module, is used for said three-phase current signal and residual voltage signal are transferred to said A/D modular converter successively;
Said A/D modular converter is connected to said multicircuit switch module; Said three-phase current signal and residual voltage signal are carried out the A/D conversion; Obtain three-phase current digital signal and residual voltage digital signal, then transformation result is transferred to said power frequency component treatment loop.
11. distribution line single-phase earthing traveling-wave protection device according to claim 10; It is characterized in that; Said power frequency component treatment loop specifically comprises: Fourier transform module, residual voltage determination module, phase current determination module and signal are left module, wherein
Said Fourier transform module is carried out Fourier transform to said three-phase current digital signal and said residual voltage digital signal, obtains three-phase current amplitude and residual voltage amplitude;
Said residual voltage determination module compares said residual voltage amplitude and said first predetermined amplitude; If said residual voltage amplitude is greater than said first predetermined amplitude; Then start preface phase current determination module, otherwise the said distribution line one-phase ground protection of involution device;
Said phase current determination module compares said three-phase current amplitude and said second predetermined amplitude; If said three-phase current amplitude is all less than said second predetermined amplitude; Then enabling signal is left module, otherwise the said distribution line one-phase ground protection of involution device;
Said signal is left module and is set according to the user, can provide trip signal or alarm signal, and signal is transferred to said exit relay.
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