CN105388374A - Converter station DC field neutral bus lightning arrester charged analysis device and method - Google Patents

Abstract

The present invention discloses a converter station DC field neutral bus lightning arrester charged analysis device. The device comprises a neutral bus lightning arrester, a DC neutral bus, an energy absorbing checking device, and a current nonuniformity analyzer. The DC neutral bus generates an operation over-voltage signal in DC system debugging. The primary side of the neutral bus lightning arrester is electrically connected to the DC neutral bus, and after the operation over-voltage signal passes by the neutral bus lightning arrester, the grounding side of the neutral bus lightning arrester generates a discharge current signal. The high voltage end of an impact voltage divider is electrically connected to the DC neutral bus, and the measuring end of the impact voltage divider generates a converted impact voltage signal. The device comprises a plurality of current sampling modules, the input ends of the current sampling modules are electrically connected to the grounded circuit of the neutral bus lightning arrester. The input end of a voltage sampling module is electrically connected to the measuring end of the impact voltage divider. The device has the advantage that energy absorption and discharge current unevenness of the lightning arrester can be monitored in real time during debugging and operation.

Description

A kind of current conversion station DC fields charged analytical equipment of neutral bus lightning arrester and method

Technical field

The present invention relates to straight-flow system debugging and live monitoring technical field, particularly relate to the charged analysis technical field of current conversion station DC fields neutral bus lightning arrester.

Background technology

Along with the rapid development of Chinese society's economy and the continuous progress of science and technology, the demand of entire society to electric energy is increasing, and therefore electrical network scale constantly expands.But there is serious asymmetric problem in Chinese energy distribution and economic development, the economically developed energy in east and south is few, Western Energy Resources enriches but economy comparatively backwardness, therefore Western Energy Resources is effectively transported to east and south, contributes to the sustainable development of national economy.High-voltage direct-current technology of transmission of electricity is with the obvious advantage in remote Large Copacity conveying because of it, has many super extra-high voltage DC transmission systems put into operation in the large ground of China.

Neutral bus lightning arrester is a power equipment main in high-voltage direct-current technology of transmission of electricity; lightning arrester is mainly used in limiting the lightning surge transmitted by circuit or the internal overvoltage having operation to cause; be one of important proterctive equipment ensureing safe operation of power system, its safe power supply of normal operation to the system of guarantee plays an important role.DC converter station neutral bus is provided with and impacts a main equipment such as capacitor, DC circuit breaker, and neutral bus lightning arrester is mainly used in the superpotential limiting neutral bus arrangement.When producing higher superpotential at neutral bus, neutral bus lightning arrester will produce comparatively macro-energy stress, therefore neutral bus lightning arrester generally adopts the structure of multiple stage parallel connection, namely can on DC bus simultaneously multiple stage neutral bus lightning arrester in parallel, one end of each neutral bus lightning arrester is connected with DC bus respectively, the other end ground connection respectively of each neutral bus lightning arrester.Find in operational process that neutral bus surge arrester failure rate is higher, on the one hand because neutral bus lightning arrester needs the energy of releasing large; The number of units that another aspect is installed in parallel due to neutral bus lightning arrester is many, and current-sharing Characteristics Control is more difficult.But neutral bus lightning arrester discharge current monitor is not installed at the scene, cannot to each neutral bus surge arrester failure electric current and energy be analyzed and early warning, thus had a strong impact on the safe operation of DC transmission system.

Summary of the invention

The invention provides the charged analytical equipment of a kind of current conversion station DC fields neutral bus lightning arrester, apply this device at debugging and run duration Real-Time Monitoring current conversion station DC fields neutral bus lightning arrester, be convenient to Timeliness coverage neutral bus surge arrester failure, ensure the safe operation of DC transmission system.

The invention provides a kind of current conversion station DC fields neutral bus lightning arrester band electricity analytical method, the method can to each neutral bus surge arrester failure electric current and energy be analyzed and early warning, ensures the safe operation of DC transmission system.

The technical solution adopted in the present invention is:

The charged analytical equipment of a kind of current conversion station DC fields neutral bus lightning arrester, for carrying out band electroanalysis to a plurality of neutral bus lightning arresters be connected in parallel on current conversion station DC fields neutral bus, when straight-flow system is debugged, neutral bus produces switching overvoltage signal, this device comprises: a plurality of current sample module, the input end of each current sample module is electrically connected with the ground loop of each described neutral bus lightning arrester respectively, for carrying out multiple repairing weld to the output signal of switching overvoltage, obtaining and sending the current data sequence of sampling; Impulse voltage divider, high-pressure side and the described neutral bus of this impulse voltage divider are electrically connected, for map function overvoltage signal, the surge voltage signal after the measuring junction of impulse voltage divider produces conversion; Voltage sample module, this voltage sample module input end and the measuring junction of impulse voltage divider be electrically connected, for carrying out multiple repairing weld to the output signal of switching overvoltage, obtaining and sending the voltage data sequence of sampling; Energy absorption checks instrument, for receive and show current data sequence, voltage data sequence information and display flows through the absorption energy of described neutral bus lightning arrester; Current unevenness even property analyser, for the information of received current data sequence and the leakage current skewness coefficient shown between each described neutral bus lightning arrester.

The present invention with neutral bus lightning arrester for subjects, with current conversion station DC fields neutral bus, current sample module, voltage sample module, energy absorption checks instrument and current unevenness even property analyser is hardware condition, obtain the current sequence signal in neutral bus arrester ground loop by current sample module and obtain DC busbar voltage sequence signal by voltage sample module, again correlated current sequence signal and contact potential series signal are sent to energy absorption and check instrument and current unevenness even property analyser, the absorption energy value that instrument obtains neutral bus lightning arrester is checked by energy absorption, judge the energy state of neutral bus lightning arrester.Decision method is: when the absorption energy value E of neutral bus lightning arrester is greater than the energy absorption value that lightning arrester producer specifies, stops debugging carrying out the test that has a power failure, determines neutral bus lightning arrester equipment state.Flow through the leakage current nonuniformity coefficient of different neutral bus lightning arrester by the display of current unevenness even property analyser, judge the flash-over characteristic of neutral bus lightning arrester.Decision method is: when the leakage current nonuniformity coefficient flowing through different neutral bus lightning arrester is greater than 10%, stops debugging, changes the lightning arrester that flash-over characteristic differs greatly.Thus ensure effective monitoring and the protection of DC bus lightning arrester, have directly perceived, fast, the advanced feature such as safety.

Described current sample module comprises Hall current sensor, #1 digiverter, #1 central processing unit and #1 wireless launcher; The sample pickup tongs brank of Hall current sensor is in the ground loop of described neutral bus lightning arrester, and the output terminal of Hall current sensor is connected with the input end of #1 central processing unit by #1 digiverter; For Hall current sensor is sent to #1 central processing unit to the current data sequence that impact discharge current signal carries out multiple repairing weld acquisition after analog to digital conversion; The output terminal of #1 central processing unit and the input end of #1 wireless launcher are electrically connected; #1 wireless launcher is used for the current data sequence after the analog to digital conversion of acquisition being sent to described energy absorption and checks instrument and described current unevenness even property analyser.

Described voltage sample module comprises voltage sensor, #2 digiverter, #2 central processing unit and #2 wireless launcher; The sampling probe of voltage sensor is serially connected in the measuring junction of described impulse voltage divider, and the output terminal of voltage sensor is connected with the input end of #2 central processing unit by #2 digiverter; For voltage sensor is sent to #2 central processing unit to the voltage data sequence that switching overvoltage output signal carries out multiple repairing weld acquisition after analog to digital conversion; The output terminal of #2 central processing unit and the input end of #2 wireless launcher are electrically connected; #2 wireless launcher is used for the voltage data sequence after the analog to digital conversion of acquisition being sent to described energy absorption and checks instrument and described current unevenness even property analyser.

Described energy absorption checks instrument and described current unevenness even property analyser all carries out wireless telecommunications by wireless receiver and described voltage sample module, described current sample module, the input end of wireless receiver respectively with the output terminal wireless connections of #1 wireless launcher, #2 wireless launcher, output terminal and the described energy absorption of wireless receiver are checked instrument and are connected respectively with described current unevenness even property analyser.

Described wireless receiver, described #1 wireless launcher, described #2 wireless launcher are wireless router.

Described neutral bus lightning arrester is Zinc-Oxide Arrester.

A kind of current conversion station DC fields neutral bus lightning arrester band electricity analytical method, comprises the following steps:

Step 1, described neutral bus lightning arrester carried out to straight-flow system debugging, when the current signal collected in the ground loop of described neutral bus lightning arrester is more than or equal to 1mA, automatic triggering described voltage sample module and described current sample module, start voltage and current signals collecting respectively; When the current signal collected in the ground loop of described neutral bus lightning arrester is less than 1mA, automatically stop voltage and current signals collecting, the sampling time is T;

Step 2, the voltage signal that described voltage sample module is collected from described impulse voltage divider, after analog to digital conversion, coating-forming voltage data sequence U (t); By the current signal that each described current sample module collects from the ground loop of each described neutral bus lightning arrester, after analog to digital conversion, form current data sequence I ₁(t), I ₂(t) ... I _n(t); The sample frequency of the sampling probe of described voltage sensor and described Hall current sensor is 4000Hz;

Step 3, to described voltage data sequence U (t) and current data sequence I ₁(t), I ₂(t) ... I _nt () arranges, form new current data sequence with voltage data sequence U ¹(t):

$U^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}U\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(1\right)$

$I_1^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}{I}_1\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(2\right)$

$I_2^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}{I}_2\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(3\right)$

……

Step 4, extract the leakage current nonuniformity coefficient β of described neutral bus lightning arrester:

$\mathrm{\β}\left(t\right)=\frac{n\×\max \left(I_1^1\right(t),I_2^1\left(t\right),...I_n^1\left(t\right))}{\underset{N=1}{\overset{n}{\mathrm{\Σ}}}{I}_n^1\left(t\right)}---\left(4\right)$

β＝max(β(t)),t＝(0,T)(5)

Step 5, extract the absorption ENERGY E of each described neutral bus lightning arrester:

$E\left(n\right)={\∫}_o^T{U}^1\left(t\right)\×I_n^1\left(t\right)dt,n=1,2,...n---\left(6\right)$

Step 6, judge the equipment state of described neutral bus lightning arrester, the method judged as:

When meeting following condition for the moment, stopping straight-flow system being debugged and is carried out insulation resistance and the reference voltage test of neutral bus lightning arrester:

The leakage current nonuniformity coefficient β of described neutral bus lightning arrester is greater than 1.1;

The absorption ENERGY E of described neutral bus lightning arrester is greater than Er, and wherein, Er is the rated energy that lightning arrester manufacturer declares.

Utilize said method can ensure effective monitoring and the protection of DC bus lightning arrester, can to each neutral bus surge arrester failure electric current and energy be analyzed and early warning, ensure the safe operation of DC transmission system.

The beneficial effect that the present invention brings is:

Apply this device at debugging and run duration Real-Time Monitoring current conversion station DC fields neutral bus lightning arrester, be convenient to Timeliness coverage neutral bus surge arrester failure, ensure the safe operation of DC transmission system.Ensure effective monitoring and the protection of DC bus lightning arrester, have directly perceived, fast, the advanced feature such as safety.

Accompanying drawing explanation

Fig. 1 is the structure principle chart of the charged analytical equipment of current conversion station DC fields neutral bus lightning arrester of the present invention;

Reference numeral:

1, neutral bus; 2, neutral bus lightning arrester; 3, impulse voltage divider; 4, current sample module; 41, Hall current sensor; 42, #1 digiverter; 43, #1 wireless launcher; 44, #1 central processing unit; 5, voltage sample module; 51, voltage sensor; 52, #2 digiverter; 53, #2 wireless launcher; 54, #2 central processing unit; 6, wireless receiver; 7, energy absorption checks instrument; 8, current unevenness even property analyser.

Embodiment

Embodiment:

Consult Fig. 1, the charged analytical equipment of a kind of current conversion station DC fields neutral bus lightning arrester, for carrying out band electroanalysis to a plurality of neutral bus lightning arresters 2 be connected in parallel on current conversion station DC fields neutral bus 1, when straight-flow system is debugged, neutral bus 1 produces switching overvoltage signal, this device comprises: a plurality of current sample module 4, the input end of each current sample module 4 is electrically connected with the ground loop of each neutral bus lightning arrester 2 respectively, for carrying out multiple repairing weld to the output signal of switching overvoltage, obtaining and sending the current data sequence of sampling; Impulse voltage divider 3, high-pressure side and the neutral bus 1 of this impulse voltage divider 3 are electrically connected, for map function overvoltage signal, the surge voltage signal after the measuring junction of impulse voltage divider 3 produces conversion; Voltage sample module 5, this voltage sample module 5 input end and the measuring junction of impulse voltage divider 3 be electrically connected, for carrying out multiple repairing weld to the output signal of switching overvoltage, obtaining and sending the voltage data sequence of sampling; Energy absorption checks instrument 7, for receive and show current data sequence, voltage data sequence information and display flows through the absorption energy of neutral bus lightning arrester 2; Current unevenness even property analyser 8, for the information of received current data sequence and the leakage current skewness coefficient shown between each neutral bus lightning arrester 2.

The present invention with neutral bus lightning arrester 2 for subjects, with current conversion station DC fields neutral bus 1, current sample module 4, voltage sample module 5, energy absorption checks instrument 7 and current unevenness even property analyser 8 is hardware condition, obtain the current sequence signal of neutral bus lightning arrester 2 ground loop by current sample module 4 and obtain DC bus 1 contact potential series signal by voltage sample module 5, again correlated current sequence signal and contact potential series signal are sent to energy absorption and check instrument 7 and current unevenness even property analyser 8, the absorption energy value that instrument 7 obtains neutral bus lightning arrester 2 is checked by energy absorption, judge the energy state of neutral bus lightning arrester 2.Decision method is: when the absorption energy value E of neutral bus lightning arrester 2 is greater than the energy absorption value that lightning arrester producer specifies, stops debugging carrying out the test that has a power failure, determines neutral bus lightning arrester 2 equipment state.Flow through the leakage current nonuniformity coefficient of different neutral bus lightning arrester 2 by the display of current unevenness even property analyser 8, judge the flash-over characteristic of neutral bus lightning arrester 2.Decision method is: when the leakage current nonuniformity coefficient flowing through different neutral bus lightning arrester 2 is greater than 10%, stops debugging, changes the lightning arrester that flash-over characteristic differs greatly.Thus ensure effective monitoring and the protection of DC bus lightning arrester 2, have directly perceived, fast, the advanced feature such as safety.

Current sample module 4 comprises Hall current sensor 41, #1 digiverter 42, #1 central processing unit 44 and #1 wireless launcher 43; The sample pickup tongs brank of Hall current sensor 41 is in the ground loop of neutral bus lightning arrester 2, and the output terminal of Hall current sensor 41 is connected with the input end of #1 central processing unit 44 by #1 digiverter 42; For Hall current sensor 41 is sent to #1 central processing unit 44 to the current data sequence that impact discharge current signal carries out multiple repairing weld acquisition after analog to digital conversion; The output terminal of #1 central processing unit 44 and the input end of #1 wireless launcher 43 are electrically connected; #1 wireless launcher 43 checks instrument 7 and current unevenness even property analyser 8 for the current data sequence after the analog to digital conversion of acquisition being sent to energy absorption.

Voltage sample module 5 comprises voltage sensor 51, #2 digiverter 52, #2 central processing unit 54 and #2 wireless launcher 53; The sampling probe of voltage sensor 51 is serially connected in the measuring junction of impulse voltage divider 3, and the output terminal of voltage sensor 51 is connected with the input end of #2 central processing unit 54 by #2 digiverter 52; Voltage data sequence for voltage sensor 51 pairs of switching overvoltage output signals are carried out multiple repairing weld acquisition is sent to #2 central processing unit 54 after analog to digital conversion; The output terminal of #2 central processing unit 54 and the input end of #2 wireless launcher 53 are electrically connected; #2 wireless launcher 53 checks instrument 7 and current unevenness even property analyser 8 for the voltage data sequence after the analog to digital conversion of acquisition being sent to energy absorption.

Energy absorption checks instrument 7 and current unevenness even property analyser 8 all carries out wireless telecommunications by wireless receiver 6 and voltage sample module 5, current sample module 4, the input end of wireless receiver 6 respectively with the output terminal wireless connections of #1 wireless launcher 43, #2 wireless launcher 53, output terminal and the energy absorption of wireless receiver 6 are checked instrument 7 and are connected respectively with current unevenness even property analyser 8.

Wireless receiver 6, #1 wireless launcher 43, #2 wireless launcher 53 are wireless router.

Neutral bus lightning arrester 2 is Zinc-Oxide Arrester.

A kind of current conversion station DC fields neutral bus lightning arrester band electricity analytical method, comprises the following steps:

Straight-flow system debugging carried out by step 1, centering bus lightning arrester 2, when the current signal collected in the ground loop of neutral bus lightning arrester 2 is more than or equal to 1mA, automatic trigger voltage sampling module 5 and current sample module 4, start voltage and current signals collecting respectively; When the current signal collected in the ground loop of neutral bus lightning arrester 2 is less than 1mA, automatically stop voltage and current signals collecting, the sampling time is T;

Step 2, the voltage signal that voltage sample module 5 is collected from impulse voltage divider 3, after analog to digital conversion, coating-forming voltage data sequence U (t); By the current signal that each current sample module 4 collects from the ground loop of each neutral bus lightning arrester 2, after analog to digital conversion, form current data sequence I ₁(t), I ₂(t) ... I _n(t); The sample frequency of the sampling probe of voltage sensor 51 and Hall current sensor 41 is 4000Hz;

Step 3, to voltage data sequence U (t) and current data sequence I ₁(t), I ₂(t) ... I _nt () arranges, form new current data sequence with voltage data sequence U ¹(t):

$U^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}U\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(1\right)$

$I_1^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}{I}_1\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(2\right)$

$I_2^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}{I}_2\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(3\right)$

……

The leakage current nonuniformity coefficient β of step 4, extraction neutral bus lightning arrester 2:

$\mathrm{\β}\left(t\right)=\frac{n\×max\left(I_1^1\right(t),I_2^1\left(t\right),...I_n^1\left(t\right))}{\underset{N=1}{\overset{n}{\Σ}}{I}_n^1\left(t\right)}---\left(4\right)$

β＝max(β(t)),t＝(0,T)(5)

Step 5, extract the absorption ENERGY E of each neutral bus lightning arrester 2:

$E\left(n\right)={\∫}_o^T{U}^1\left(t\right)\×I_n^1\left(t\right)dt,n=1,2,...n---\left(6\right)$

Step 6, judge the equipment state of neutral bus lightning arrester 2, the method judged as:

When meeting following condition for the moment, stopping straight-flow system being debugged and is carried out insulation resistance and the reference voltage test of neutral bus lightning arrester 2:

The leakage current nonuniformity coefficient β of neutral bus lightning arrester 2 is greater than 1.1;

The absorption ENERGY E of neutral bus lightning arrester 2 is greater than Er, and wherein, Er is the rated energy that lightning arrester manufacturer declares.

Test method of the present invention is as follows:

When carrying out straight-flow system debugging, neutral bus 1 will produce higher superpotential, by impulse voltage divider 3, switching overvoltage signal is converted to the measuring-signal that can be used for analyzing, voltage sensor 51 is used to extract overvoltage signal at impulse voltage divider 3 measuring junction, the voltage data sequence after signal conversion is carried out through #2 digiverter 52, reach #2 central processing unit 54, #2 central processing unit 54, by #2 wireless launcher 53, voltage data sequence is passed through wireless transmission.The superpotential that neutral bus 1 produces makes neutral bus lightning arrester 2 flow through electric current, Hall current sensor 41 is used to extract discharge current signal at neutral bus lightning arrester 2 earth terminal, the current data sequence after signal conversion is carried out through #1 digiverter 42, reach #1 central processing unit 44, #1 central processing unit 44, by #1 wireless launcher 43, current data sequence is passed through wireless transmission.Wireless receiver 6 receives the voltage data sequence from #2 wireless launcher 53 and the current data sequence from #1 wireless launcher 4343, after when two data sequences to be carried out pair, on the one hand voltage data sequence is multiplied with current data sequence and quadratures, calculate the absorption energy flowing through neutral bus lightning arrester 2, and energy datum is sent to energy absorption check instrument 7, compare the discharge current from different neutral bus lightning arrester 2 on the other hand, calculate its leakage current nonuniformity coefficient, be sent to current unevenness even property analyser 8.

Above-listed detailed description is illustrating for one of the present invention possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.

Claims (7)

1. the charged analytical equipment of current conversion station DC fields neutral bus lightning arrester, for carrying out band electroanalysis to a plurality of neutral bus lightning arresters (2) be connected in parallel on current conversion station DC fields neutral bus (1), when straight-flow system is debugged, this neutral bus (1) produces switching overvoltage signal, it is characterized in that: this device comprises:

A plurality of current sample module (4), the input end of each current sample module (4) is electrically connected with the ground loop of each described neutral bus lightning arrester (2) respectively, for carrying out multiple repairing weld to the output signal of switching overvoltage, obtaining and sending the current data sequence of sampling;

Impulse voltage divider (3), high-pressure side and the described neutral bus (1) of this impulse voltage divider (3) are electrically connected, for map function overvoltage signal, the surge voltage signal after the measuring junction of impulse voltage divider (3) produces conversion;

Voltage sample module (5), this voltage sample module (5) input end and the measuring junction of impulse voltage divider (3) be electrically connected, for carrying out multiple repairing weld to the output signal of switching overvoltage, obtaining and sending the voltage data sequence of sampling;

Energy absorption checks instrument (7), for receive and show current data sequence, voltage data sequence information and display flows through the absorption energy of described neutral bus lightning arrester (2);

Current unevenness even property analyser (8), for the information of received current data sequence and the leakage current skewness coefficient shown between each described neutral bus lightning arrester (2).

2. the charged board separating device of current conversion station DC fields neutral bus lightning arrester according to claim 1, is characterized in that: described current sample module (4) comprises Hall current sensor (41), #1 digiverter (42), #1 central processing unit (44) and #1 wireless launcher (43);

The sample pickup tongs brank of Hall current sensor (41) is in the ground loop of described neutral bus lightning arrester (2), and the output terminal of Hall current sensor (41) is connected with the input end of #1 central processing unit (44) by #1 digiverter (42); For Hall current sensor (41) is sent to #1 central processing unit (44) to the current data sequence that impact discharge current signal carries out multiple repairing weld acquisition after analog to digital conversion;

The output terminal of #1 central processing unit (44) and the input end of #1 wireless launcher (43) are electrically connected; #1 wireless launcher (43) checks instrument (7) and described current unevenness even property analyser (8) for the current data sequence after the analog to digital conversion of acquisition being sent to described energy absorption.

3. the charged board separating device of current conversion station DC fields neutral bus lightning arrester according to claim 1 and 2, is characterized in that: described voltage sample module (5) comprises voltage sensor (51), #2 digiverter (52), #2 central processing unit (54) and #2 wireless launcher (53);

The sampling probe of voltage sensor (51) is serially connected in the measuring junction of described impulse voltage divider (3), and the output terminal of voltage sensor (51) is connected with the input end of #2 central processing unit (54) by #2 digiverter (52); For voltage sensor (51) is sent to #2 central processing unit (54) to the voltage data sequence that switching overvoltage output signal carries out multiple repairing weld acquisition after analog to digital conversion;

The output terminal of #2 central processing unit (54) and the input end of #2 wireless launcher (53) are electrically connected; #2 wireless launcher (53) checks instrument (7) and described current unevenness even property analyser (8) for the voltage data sequence after the analog to digital conversion of acquisition being sent to described energy absorption.

4. the charged board separating device of current conversion station DC fields neutral bus lightning arrester according to claim 3, it is characterized in that: described energy absorption check instrument (7) and described current unevenness even property analyser (8) are all by wireless receiver (6) and described voltage sample module (5), described current sample module (4) carries out wireless telecommunications, the input end of wireless receiver (6) respectively with #1 wireless launcher (43), the output terminal wireless connections of #2 wireless launcher (53), output terminal and the described energy absorption of wireless receiver (6) are checked instrument (7) and are connected respectively with described current unevenness even property analyser (8).

5. the charged analytical equipment of current conversion station DC fields neutral bus lightning arrester according to claim 4, is characterized in that: described wireless receiver (6), described #1 wireless launcher (43), described #2 wireless launcher (53) are wireless router.

6. the charged analytical equipment of current conversion station DC fields neutral bus lightning arrester according to claim 1 and 2, is characterized in that: described neutral bus lightning arrester (2) is Zinc-Oxide Arrester.

7., based on a current conversion station DC fields neutral bus lightning arrester band electricity analytical method for device described in claim 1-4, it is characterized in that: comprise the following steps:

Step 1, described neutral bus lightning arrester (2) carried out to straight-flow system debugging, when the current signal collected in the ground loop of described neutral bus lightning arrester (2) is more than or equal to 1mA, automatic triggering described voltage sample module (5) and described current sample module (4), start voltage and current signals collecting respectively; When the current signal collected in the ground loop of described neutral bus lightning arrester (2) is less than 1mA, automatically stop voltage and current signals collecting, the sampling time is T;

Step 2, the voltage signal that described voltage sample module (5) is collected from described impulse voltage divider (3), after analog to digital conversion, coating-forming voltage data sequence U (t); By the current signal that each described current sample module (4) collects from the ground loop of each described neutral bus lightning arrester (2), after analog to digital conversion, form current data sequence I ₁(t), I ₂(t) ... I _n(t); The sample frequency of the sampling probe of described voltage sensor (51) and described Hall current sensor (41) is 4000Hz;

Step 3, to described voltage data sequence U (t) and current data sequence I ₁(t), I ₂(t) ... I _nt () arranges, form new current data sequence with voltage data sequence U ¹(t):

$U^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}U\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(1\right)$

$I_1^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}{I}_1\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(2\right)$

$I_2^1\left(t\right)=\underset{t=0}{\overset{T}{\Σ}}{I}_2\left(t\right)e^{-j\frac{2\mathrm{\π}t}{T}}---\left(3\right)$

……

Step 4, extract the leakage current nonuniformity coefficient β of described neutral bus lightning arrester (2):

$\mathrm{\β}\left(t\right)=\frac{n\×max(I_1^1\left(t\right),I_2^1\left(t\right),...I_n^1\left(t\right))}{\underset{N=1}{\overset{n}{\Σ}}{I}_n^1\left(t\right)}---\left(4\right)$

β＝max(β(t)),t＝(0,T)(5)

Step 5, extract the absorption ENERGY E of each described neutral bus lightning arrester (2):

$E\left(n\right)={\∫}_o^T{U}^1\left(t\right)\×I_n^1\left(t\right)dt,n=1,2,...n---\left(6\right)$

Step 6, judge the equipment state of described neutral bus lightning arrester (2), the method judged as:

When meeting following condition for the moment, stopping straight-flow system being debugged and is carried out insulation resistance and the reference voltage test of neutral bus lightning arrester (2):

The leakage current nonuniformity coefficient β of described neutral bus lightning arrester (2) is greater than 1.1;

The absorption ENERGY E of described neutral bus lightning arrester (2) is greater than Er, and wherein, Er is the rated energy that lightning arrester manufacturer declares.