CN104698278A - Alternating current line alternating current lightning arrester live detection system and method - Google Patents

Abstract

The invention discloses an alternating current line alternating current lightning arrester live detection system. The system comprises a high-voltage alternating current bus, a pole and tower, an alternating current lightening arrester, a bus voltage transformer, a current sampling module, a voltage sampling module, an alternating current line resistance measuring module, a bus current transformer and a processing module, wherein a current data sequence, a voltage data sequence and a bus current data sequence extracted by the current sampling module and the voltage sampling module through the alternating current lightning arrester, the bus voltage transformer and the bus current transformer respectively and an alternating current line current value of the alternating current line resistance measuring module are received by the processing module and are calculated to judge the reliability of the alternating current lightening arrester. The invention also discloses a method for detecting the reliability by using the live detection system. According to the system and the method, the adverse effects of factors such as aging and damping on the alternating current lightning arrester are reduced, and the safety for operation of the alternating current system is improved.

Description

A kind of alternating current circuit alternating-current lightning arrestor electrification detection system and method

Technical field

The present invention relates to AC system detection technique field, be specifically related to the on-line detecting system of a kind of alternating current circuit alternating-current lightning arrestor and adopt this system to carry out the method for reliability detection.

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 UHV AC transmission technique is with the obvious advantage in the conveying of short distance electric power because of it, has many 10kV ~ 1000kV surpass ultra-high voltage AC transmission system and put into operation in the large ground of China.

In order to improve transmission line of electricity operational reliability, particularly the super safe and stable operation of (spy) high pressure to whole electrical network is most important.Rose to 1980, abroad propose and install leakage conductor to reduce line tripping accident on transmission line of electricity, leakage conductor is successively successfully applied on transmission line of electricity by the U.S. and Japan, is is domesticly also installing and using in a large number in recent years.But, alternating current circuit lightning arrester is installed in the middle of transmission line of electricity, the supply of for want of overhauling power supply can not carry out the duty that year prevention preventive trial judges AC line lightning arrester, also live monitoring and the on-line monitoring of alternating-current lightning arrestor is not carried out by the method for on-line monitoring, the measurement of the leakage current under 1mA canonical reference voltage and 0.75 reference voltage can only be carried out at present by self-powered device to the judgement of alternating current circuit lightning arrester state, but current method instrument is heavy, transmission line of electricity is many through alpine belt, current blackouts monitoring method difficulty maybe cannot be implemented greatly.Therefore, develop a kind of alternating current circuit lightning arrester on-line detecting system, the impedance threshold of alternating current circuit lightning arrester can be determined in real time, the safe and stable operation of AC electric power systems is had great significance, electric power supply is ensured there is important technical support, brings great economic benefit simultaneously.

Summary of the invention

The object of the invention is to for above-mentioned alternating current circuit lightning arrester feature, the alternating current circuit lightning arrester on-line detecting system providing a kind of good stability, reliability high and adopt this system to carry out the method for reliability detection, for determining the running status of alternating-current lightning arrestor.

For realizing above object, this invention takes following technical scheme:

A kind of alternating current circuit alternating-current lightning arrestor electrification detection system, it comprises:

High voltage AC bus, for generation of ac voltage signal;

Exchanging wire, for connecting high voltage AC bus and shaft tower, realizing electric energy conveying;

Shaft tower, for carrying out shoring of foundation to interchange wire;

Bus-bar potential transformer, the primary side of described bus-bar potential transformer and high voltage AC bus are electrically connected, for converting described ac voltage signal, the alternating voltage output signal after the secondary side of bus-bar potential transformer produces a conversion;

Alternating-current lightning arrestor, be installed on described shaft tower side, the primary side of described alternating-current lightning arrestor with exchange wire and be electrically connected, form current signal measurement point, described ac voltage signal produces an ac current signal in the ground side of alternating-current lightning arrestor after flowing through alternating-current lightning arrestor by interchange wire;

Voltage sample module, the input end of described voltage sample module and the secondary side of bus-bar potential transformer are electrically connected, and for carrying out multiple repairing weld to described alternating voltage output signal, obtain the voltage data sequence of sampling;

Current sample module, the input end of described current sample module and the ground loop of alternating-current lightning arrestor are electrically connected, for carrying out multiple repairing weld to described ac current signal, obtain the current data sequence of sampling, the quantity of described current data sequence and voltage data sequence is equal;

Exchange conductor impedance parameters measurement module, for measuring the current vector and voltage vector that exchange wire, to obtain the impedance parameter exchanging wire;

Busbar current transformer, the primary side of described busbar current transformer and high voltage AC bus are electrically connected, for producing a bus current signal at the secondary side of busbar current transformer;

Processing module, for receiving described current data sequence, voltage data sequence, exchanging the current vector of wire and voltage vector and bus current signal and calculate it, to judge the reliability of alternating-current lightning arrestor.

Described current sample module comprises the first current sensor, first a/d conversion device, first central processing unit and the first wireless transceiver terminal, the sampling probe of described first current sensor is serially connected in the ground loop of alternating-current lightning arrestor, the output terminal of described first current sensor is connected with the input end of the first central processing unit by the first a/d conversion device, for the first current sensor is sent to the first central processing unit to the current data sequence that described ac current signal carries out multiple repairing weld acquisition after analog to digital conversion, the output terminal of described first central processing unit and the input end of the first wireless transceiver terminal are electrically connected, for the current data sequence after the analog to digital conversion of acquisition is sent to processing module by the first wireless transceiver terminal.

Described voltage sample module comprises voltage sensor, second a/d conversion device, second central processing unit and the second wireless transceiver terminal, the sampling probe of described voltage sensor is serially connected in the secondary side of bus-bar potential transformer, the output terminal of described voltage sensor is connected with the input end of the second central processing unit by the second a/d conversion device, for voltage sensor is sent to the second central processing unit to the voltage data sequence that described alternating voltage output signal carries out multiple repairing weld acquisition after analog to digital conversion, the output terminal of described second central processing unit and the input end of the second wireless transceiver terminal are electrically connected, for the voltage data sequence after the analog to digital conversion of acquisition is sent to processing module by the second wireless transceiver terminal.

Described interchange wire comprises A phase conductor, B phase conductor and C phase conductor, wherein, the disconnected chalaza that A phase conductor, B phase conductor and C phase conductor are formed with high voltage AC bus is respectively designated as D point, E point and F point respectively, the primary side of described alternating-current lightning arrestor with exchange current signal measurement point that wire formed and lay respectively at X point, Y point and Z point on A phase conductor, B phase conductor and C phase conductor; Described A phase conductor, B phase conductor and disconnected conjunction place between C phase conductor and high voltage AC bus are respectively equipped with K switch 1, K switch 2 and K switch 3, and described X point, Y point and Z point are respectively equipped with K switch 4, K switch 5 and K switch 6 with exchanging on wire between shaft tower.

Described interchange conductor impedance parameters measurement module comprises measures power supply, current measuring device, voltage measuring apparatus, earthing device, the 3rd a/d conversion device, the 3rd wireless transceiver terminal; Wherein, the three-phase output end measuring power supply is connected to D point, E point and F point respectively by three phase terminals, and described three phase terminals are connected with current measuring device and voltage measuring apparatus; Described earthing device comprises K switch 7, K switch 8, K switch 9 and K10, and one end of described K switch 9, K switch 8, K switch 7 is connected to X point, Y point and Z point respectively, and the other end of three is all by K switch 10 ground connection; The output terminal of described current measuring device and voltage measuring apparatus all via the 3rd wireless transceiver terminal the two is recorded current vector respectively by the 3rd a/d conversion device and voltage vector is sent to processing module.

Described processing module comprises:

Wireless transceiver master station, the input end of described wireless transceiver master station respectively with the output terminal wireless connections of the first wireless transceiver terminal, the second wireless transceiver terminal and the 3rd wireless transceiver terminal, the output terminal of described wireless transceiver master station is connected with server, for set up current sample module with between server, voltage sample module is with between server and the communication exchanged between conductor impedance parameters measurement module and server;

Server, for receiving from the current data sequence of wireless transceiver master station, voltage data sequence, the current vector exchanging wire and voltage vector and bus current signal, and by calculating the reliability judging alternating-current lightning arrestor.

Described wireless transceiver master station, the first wireless transceiver terminal, the second wireless transceiver terminal and the 3rd wireless transceiver terminal are wireless router.

The secondary side of described busbar current transformer is connected to the input end of one second current sensor, after the output terminal of the second current sensor carries out analog to digital conversion by one the 4th a/d conversion device, by one the 4th central processing unit, described bus current signal is sent to processing module by the 4th wireless transceiver terminal.

A kind of alternating current circuit alternating-current lightning arrestor live detection method, it comprises the following steps:

Step 1, carry out the measurement of AC line voltage vector sum current vector by exchanging conductor impedance parameters measurement module, and calculating interchange conductor impedance parameter, described interchange conductor impedance parameter is the impedance parameter of the alternating current circuit between high voltage AC bus and current signal measurement point; Described current signal measurement point is the contact that the primary side of the alternating-current lightning arrestor being positioned at shaft tower side is connected on alternating current circuit; Described interchange wire comprises A phase conductor, B phase conductor and C phase conductor, wherein, the disconnected chalaza that A phase conductor, B phase conductor and C phase conductor are formed with high voltage AC bus is respectively designated as D point, E point and F point respectively, the primary side of alternating-current lightning arrestor with exchange current signal measurement point that wire formed and lay respectively at X point, Y point and Z point on A phase conductor, B phase conductor and C phase conductor; Described A phase conductor, B phase conductor and disconnected conjunction place between C phase conductor and high voltage AC bus are respectively equipped with K switch 1, K switch 2 and K switch 3, and described X point, Y point and Z point are respectively equipped with K switch 4, K switch 5 and K switch 6 with exchanging on wire between shaft tower; Described interchange conductor impedance parameters measurement module comprises measures power supply, current measuring device, voltage measuring apparatus, earthing device; Wherein, the three-phase output end measuring power supply is connected to D point, E point and F point respectively by three phase terminals, and described three phase terminals are connected with current measuring device and voltage measuring apparatus; Described earthing device comprises K switch 7, K switch 8, K switch 9 and K10, and one end of described K switch 9, K switch 8, K switch 7 is connected to X point, Y point and Z point respectively, and the other end of three is all by K switch 10 ground connection;

Described step 1 comprises the following steps:

Step 11, cut-off switch K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10, obtain current vector by current measuring device voltage vector is obtained by voltage measuring apparatus now impedance Z is calculated according to formula (1) ₁:

$Z_1=\frac{{\stackrel{\·}{U}}_1}{{\stackrel{\·}{I}}_1}---\left(1\right)$

Step 12, cut-off switch K1, K2, K3, K4, K5 and K6, Closing Switch K7, K8, K9 and K10, obtain current vector by current measuring device voltage vector is obtained by voltage measuring apparatus now impedance Z is calculated according to formula (2) ₀:

$Z_0=\frac{{\stackrel{\·}{U}}_0}{{\stackrel{\·}{I}}_0}---\left(2\right);$

Step 2, the sampling probe of the first current sensor is taked ac current signal from the ground loop of alternating-current lightning arrestor, after analog to digital conversion, form current data sequence I (k); Alternating voltage is taked to output signal from bus-bar potential transformer secondary side the sampling probe of voltage sensor, after analog to digital conversion, coating-forming voltage data sequence U (k); The sampling probe of the second current sensor is taked bus ac current signal from busbar current transformer secondary side, after analog to digital conversion, forms bus current data sequence I ¹(k); The sample frequency of the sampling probe of the first current sensor, the sampling probe of the second current sensor and the sampling probe of voltage sensor is 500Hz, and the sampling number of three is 500, and wherein, the value of k is 0,1,2 ... 499;

Step 3, through type (3)-(5), respectively to described current data sequence I (k), voltage data sequence U (k), bus current data sequence I ¹k () arranges respectively, form new current data sequence I ₀(k), voltage data sequence U ₀(k) and bus current data sequence

$I_0\left(k\right)=\underset{n=0}{\overset{499}{\mathrm{\Σ}}}I\left(n\right)e^{-j\frac{2\mathrm{\πk}}{500}}---\left(3\right)$

$U_0\left(k\right)=\underset{n=0}{\overset{499}{\mathrm{\Σ}}}U\left(n\right)e^{-j\frac{2\mathrm{\πk}}{500}}---\left(4\right)$

$I_0^1\left(k\right)=\underset{n=0}{\overset{499}{\mathrm{\Σ}}}{I}^1\left(n\right)e^{-j\frac{2\mathrm{\πk}}{500}}---\left(5\right)$

Voltage data sequence U in step 4, formula (4) ₀k () is the magnitude of voltage of high voltage AC bus side, need the alternating current circuit lightning arrester magnitude of voltage being converted into shaft tower side, and reduction formula is such as formula shown in (6):

$U_0^{\′}\left(k\right)=\frac{U_0\left(k\right)\sqrt{Z_0/Z_1}}{250}+\frac{I_0^1\left(k\right)\sqrt{Z_0{Z}_1}\sinh \left({\coth }^{-1}\sqrt{Z_0/Z_1}\right)}{250}---\left(6\right)$

In formula (6), sinh is hyperbolic sine function, coth ^-1for the inverse function of cosh;

Step 5, based on formula (2)-(6), extract the 50Hz of alternating-current lightning arrestor, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, the resistance value of 400Hz, 450Hz and angle, respectively such as formula shown in (7) and formula (8):

$Z_l=\frac{{({\left(\mathrm{Re}\left({U_0}^{\′}\left(l\right)\right)\right)}^2+{\left(\mathrm{Im}\left({U_0}^{\′}\left(l\right)\right)\right)}^2)}^{\frac{1}{2}}*e^{j\arctan \left(\frac{\mathrm{Im}\left(U_{0^{\′}}\left(l\right)\right)}{\mathrm{Re}\left(U_{0^{\′}}\left(l\right)\right)}\right)}}{{({\left(\mathrm{Re}\left(I_0\left(l\right)\right)\right)}^2+{\left(\mathrm{Im}\left(I_0\left(l\right)\right)\right)}^2)}^{\frac{1}{2}}*e^{j\arctan \left(\frac{\mathrm{Im}\left(I_0\left(l\right)\right)}{\mathrm{Re}\left(I_0\left(l\right)\right)}\right)}}---\left(7\right)$

${\mathrm{\θ}}_l=\arctan \left(\frac{\mathrm{Im}\left(I_0\left(l\right)\right)}{\mathrm{Re}\left(I_0\left(l\right)\right)}\right)---\left(8\right)$

In formula (7) and formula (8), l gets 50,100,150,200,250,300,350,400 and 450Hz respectively;

The reliability of step 6, judgement alternating-current lightning arrestor, the method for judgement:

When meeting following condition for the moment, having a power failure and changing described alternating-current lightning arrestor:

The current value I of 50Hz ₀(50) 50mA is greater than;

The resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change be greater than 100%;

When meeting following condition for the moment, the cycle of the adjacent secondary live detection of reduction alternating-current lightning arrestor is to strengthen monitoring:

The resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change be greater than 50% and be less than 70%;

Between adjacent twice live detection, the change of the angle of 50Hz, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, 400Hz and 450Hz is all greater than 10 °.

If the 50Hz of alternating-current lightning arrestor, when the resistance value of 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, 400Hz, 450Hz and angle are for measuring first, then only consider the current value I of 50Hz ₀(50) whether 50mA is greater than.

The present invention compared with prior art, tool has the following advantages: the present invention compared with prior art, tool has the following advantages: the present invention with alternating current circuit lightning arrester for subjects, with high voltage AC bus, bus-bar potential transformer, current sensor, voltage sensor, a/d conversion device, central processing unit, wireless transceiver terminal, wireless transceiver master station and server are hardware condition, the current sequence signal in arrester ground loop and voltage sampling apparatus is taked to take busbar voltage sequence signal by current sampling device, deliver to by wireless telecommunications the 50Hz that server carries out alternating-current lightning arrestor after process, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, 400Hz, the resistance value of 450Hz and angle, judge the running status of alternating-current lightning arrestor.Thus ensure the available protecting effect of alternating-current lightning arrestor, have directly perceived, fast, the advanced feature such as safety, decrease the aging factor such as to make moist to the adverse effect of alternating-current lightning arrestor.

Accompanying drawing explanation

Fig. 1 is the structure principle chart of a kind of alternating current circuit of the present invention alternating-current lightning arrestor electrification detection system;

Fig. 2 is the circuit theory diagrams exchanging conductor impedance parameters measurement module;

Fig. 3 is the schematic diagram of measuring state in Fig. 2.

Wherein: 1, high voltage AC bus; 2, shaft tower; 3, bus-bar potential transformer; 4, alternating-current lightning arrestor; 5, voltage sample module; 51, voltage sensor; 52, a/d conversion device; 53, central processing unit; 54, wireless transceiver terminal; 6, current sample module; 61, current sensor; 62, a/d conversion device; 63, central processing unit; 64, wireless transceiver terminal; 7, conductor impedance parameters measurement module is exchanged; 71, wire is exchanged; 72, power supply is measured; 73, current measuring device; 74, voltage measuring apparatus; 75, earthing device; 76, a/d conversion device; 77, wireless transceiver terminal; 8, wireless transceiver master station; 9, server; 10, busbar current transformer; 101, current sensor; 102, a/d conversion device; 103, central processing unit; 104, wireless transceiver terminal.

Embodiment

Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.

Embodiment:

Please refer to shown in Fig. 1, a kind of alternating current circuit alternating-current lightning arrestor electrification detection system, is applicable to the performance test of leakage conductor, in use breaks down to prevent it.This electrification detection system comprises: for providing ac voltage signal to do the high voltage AC bus 1 analyzed, the alternating-current lightning arrestor connected is for providing the shaft tower 2 of ac current signal, for converting alternating voltage so that voltage sensor 51 takes the bus-bar potential transformer 3 of data, for providing the ac current signal flowing through lightning arrester to do the alternating-current lightning arrestor 4 analyzed, for taking voltage transformer secondary side (for current transformer, voltage transformer (VT) and alternating-current lightning arrestor, in the present invention, primary side all refers to a winding side and high-pressure side, secondary side all refers to Secondary Winding side and low-pressure side) ac voltage signal and carry out the voltage sample module 5 of AD conversion process etc., for taking the current signal of alternating-current lightning arrestor 4 ground side and carrying out the current sample module 6 of AD conversion process, conductor impedance parameters measurement module 7 is exchanged from the alternating current circuit resistance between voltage signal measurement point with current signal measurement point for measuring, one end is connected with voltage sample module 5, current sample module 6 respectively, the other end is connected with server 9, for realizing between voltage sample module 5 with server 9, between current sample module 6 with server 9, between busbar current transformer 10 with server 9 and exchanging the wireless transceiver master station 8 of conductor impedance parameters measurement module 7 and the communication of server 9, for the treatment of receiving the electric current and voltage data-signal of coming from wireless transceiver master station 8 and carrying out the server 9 of corresponding computing.

Current sample module 6 comprises current sensor 61, a/d conversion device 62, central processing unit 63 and wireless transceiver terminal 64, the sampling probe of current sensor 61 is serially connected in the ground loop of alternating-current lightning arrestor 4, the output terminal of current sensor 61 is connected with the input end of central processing unit 63 by a/d conversion device 62, current data sequence for current sensor 61 pairs of ac current signals being carried out multiple repairing weld acquisition is sent to central processing unit 63 after analog to digital conversion, the output terminal of central processing unit 63 and the input end of wireless transceiver terminal 64 are electrically connected, for the current data sequence after the analog to digital conversion of acquisition is sent to processing module by wireless transceiver terminal 64.

Voltage sample module 5 comprises voltage sensor 51, a/d conversion device 52, central processing unit 53 and wireless transceiver terminal 54, the sampling probe of voltage sensor 51 is serially connected in bus-bar potential transformer secondary side, the output terminal of voltage sensor 51 is connected with the input end of central processing unit 53 by a/d conversion device 52, voltage data sequence for voltage sensor 51 pairs of alternating voltage output signals are carried out multiple repairing weld acquisition is sent to central processing unit 53 after analog to digital conversion, the output terminal of central processing unit 53 and the input end of wireless transceiver terminal 54 are electrically connected, for the voltage data sequence after the analog to digital conversion of acquisition is sent to processing module by wireless transceiver terminal 54.

The primary side of busbar current transformer 10 is connected with high voltage AC bus 1, for gathering the bus current signal of high voltage AC bus 1, its secondary side connects the sampling probe of current sensor 101, multi collect is carried out by the bus current signal of this current sensor 101 pairs of high voltage AC bus 1, form bus current data sequence, then, after this bus current data sequence carries out digital-to-analog conversion by a/d conversion device 102, processing module is sent to by central processing unit 103 via wireless transceiver terminal 104.

Please refer to shown in Fig. 2, exchange conductor impedance parameters measurement module 7 and comprise measurement power supply 72 (three-phase alternating-current supply), current measuring device 73 (three-phase alternating current table), voltage measuring apparatus 74 (three phase current AC voltmeter), earthing device 75, a/d conversion device 76, wireless transceiver terminal 77, the resistance exchanging wire 71 is the target measured, exchange wire 71 and comprise A phase conductor, B phase conductor and C phase conductor, wherein, A phase conductor, the disconnected chalaza that B phase conductor and C phase conductor are formed with high voltage AC bus 1 is respectively designated as D point respectively, E point and F point, the primary side of alternating-current lightning arrestor 4 with exchange the current signal measurement point that wire 71 formed and lay respectively at A phase conductor, X point on B phase conductor and C phase conductor, Y point and Z point, A phase conductor, B phase conductor and disconnected conjunction place between C phase conductor and high voltage AC bus 1 are respectively equipped with K switch 1, K switch 2 and K switch 3, X point, Y point and Z point and are respectively equipped with K switch 4, K switch 5 and K switch 6 with exchanging on wire 71 between shaft tower 2.The three-phase output end measuring power supply 72 is connected to D point, E point and F point respectively by three phase terminals, three phase terminals is connected with current measuring device 73 and voltage measuring apparatus 74; Earthing device 75 comprises K switch 7, K switch 8, K switch 9 and K10, and one end of K switch 9, K switch 8, K switch 7 is connected to X point, Y point and Z point respectively, and the other end of three is all by K switch 10 ground connection; The output terminal of current measuring device 73 and voltage measuring apparatus 74 all via the 3rd wireless transceiver terminal 77 three is recorded current vector respectively by the 3rd a/d conversion device 76 and voltage vector is sent to processing module.It should be noted that, this interchange conductor impedance parameters measurement module 7 only need carry out one-shot measurement, later without the need to again measuring before alternating-current lightning arrestor live detection.

Wireless transceiver master station 8 one end is connected with server 9, and the other end is then by wireless network and voltage, current sample module 5,6 and exchange conductor impedance parameters measurement module 7 and to be connected with the wireless transceiver terminal 54,64,77,104 in busbar current transformer 10 and to realize communication.

Described wireless transceiver terminal 54,64,77,104 and wireless transceiver master station 8 are wireless router.

In embodiment, high voltage AC bus 1 can adopt the one pole H type aluminium trolley HXPnR-H of Tian Bao, Yangzhou group company, bus-bar potential transformer 3 can adopt the TAK type of Yao Hua Dechang Electronics Co., Ltd., alternating-current lightning arrestor 4 can adopt the AM type alternating current power supply lightening protector of Guangdong An Xun lightning protection Science and Technology Co., Ltd., the voltage sensor 51 HV series voltage sensor of Beijing New Chuang Si Fang Electronic Co., Ltd., current sensor 61 and current sensor 101 can adopt the B1 ac leakage flow sensor LF-MI11-35B1-1.0/0 ~ ± 10mA model of Shenzhen Xin Ruida company, a/d conversion device 52, 62, 76 and the 102 AD876 models that can adopt Wei Xue Electronics Co., Ltd. of Shenzhen, central processing unit 53, 63 and 103 single-chip microcomputers that can adopt Weisheng, Shenzhen hundred million generation Science and Technology Ltd., measure the i/iX series II general AC power supply that power supply 72 can adopt California instrument company, current measuring device 73 and voltage measuring apparatus 74 can adopt the KR-3VA intelligent three-phase voltage/reometer of Xin Kerui Electric Applicance Co., Ltd of Shenzhen, earthing device 75 can adopt the TB series of ground module of Beijing Guo electricity Tianbang Science and Technology Co., Ltd., wireless transceiver terminal 54, 64, 77, 104 and wireless transceiver master station 8 all can adopt the SOHO wireless router of B-Link, server 9 Dell PowerEdge R410.

The present embodiment is for the live detection first of the alternating current circuit alternating-current lightning arrestor of certain 500kV electric pressure, similar with it in the method for the repeatedly live detection every certain live detection cycle, after exceeding time live detection, can according to the resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change and adjacent twice live detection between the change of angle of 50Hz, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, 400Hz and 450Hz be all greater than 10 ° of rate of change and judge.The process that above-mentioned alternating current circuit alternating-current lightning arrestor electrification detection system of sampling carries out reliability detection is as follows:

Step 1, measure by exchanging conductor impedance parameters measurement module 7 interchange conductor impedance parameter, its process is as follows:

Please refer to shown in Fig. 2, cut-off switch K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10, obtain current vector by current measuring device 73 voltage vector is obtained by voltage measuring apparatus 74 now impedance Z is calculated according to formula (1) ₁=78.2 ∠ 83.7 °;

Please refer to shown in Fig. 3, cut-off switch K1, K2, K3, K4, K5 and K6, Closing Switch K7, K8, K9 and K10, obtain current vector by current measuring device 73 voltage vector is obtained by voltage measuring apparatus 74 now impedance Z is calculated according to formula (2) ₀=3.81 ∠ 90 °;

Step 2, the sampling probe of current sensor 61 is taked ac current signal from the ground loop of alternating-current lightning arrestor 4, after analog to digital conversion, form current data sequence I (k); Alternating voltage is taked to output signal from bus-bar potential transformer secondary side the sampling probe of voltage sensor, after analog to digital conversion, coating-forming voltage data sequence U (k); The sampling probe of the second current sensor is taked bus ac current signal from busbar current transformer secondary side, after analog to digital conversion, forms bus current data sequence I ¹(k); The sample frequency of the sampling probe of the first current sensor, the sampling probe of the second current sensor and the sampling probe of voltage sensor is 500Hz, and the sampling number of three is 500, and wherein, the value of k is 0,1,2 ... 499;

Step 3, through type (3)-(5), respectively to described current data sequence I (k), voltage data sequence U (k), bus current data sequence I ¹k () arranges respectively, form new current data sequence I ₀(k), voltage data sequence U ₀(k) and bus current data sequence with reference to shown in formula (9)-(11):

I ₀(k)＝{1.3×10 ^-13,4.2×10 ^-14,,6.7×10 ^-14} (9)

U ₀(k)＝{2.4×10 ^-14,3.6×10 ^-15,,8.1×10 ^-16} (10)

$I_0^1\left(k\right)=\{5.3\×{10}^{-13},2.1\×{10}^{-15},...,2.4\×{10}^{-13}\}---\left(11\right)$

Voltage data sequence U in step 4, formula (10) ₀k () is the magnitude of voltage of high voltage AC bus side, need the alternating current circuit lightning arrester magnitude of voltage being converted into shaft tower side, and reduction formula is such as formula shown in (6), and the result of calculation of acquisition is with reference to formula (12):

U ₀′(k)＝{7.2×10 ^-12,2.7×10 ^-14,…,3.5×10 ^-13} (12)

Step 5, based on formula (2)-(6), through type (7) and formula (8), extract the 50Hz of alternating-current lightning arrestor, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, the resistance value of 400Hz, 450Hz and angle, the structure of acquisition is respectively such as formula shown in (13) and formula (14):

Z _l＝{0,0,…,0} (13)

θ _l＝{81.49,84.31,…,83.98} (14)

The reliability of step 6, judgement alternating-current lightning arrestor, the method for judgement:

When meeting following condition for the moment, having a power failure and changing described alternating-current lightning arrestor:

The current value I of 50Hz ₀(50) 50mA is greater than;

The resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change be greater than 100%;

When meeting following condition for the moment, the cycle of the adjacent secondary live detection of reduction alternating-current lightning arrestor is to strengthen monitoring:

The resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change be greater than 50% and be less than 70%;

Between adjacent twice live detection, the change of the angle of 50Hz, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, 400Hz and 450Hz is all greater than 10 °.

This alternating-current lightning arrestor, owing to being DATA REASONING and analysis first, only analyzes the current value I of its 50Hz ₀(50) be 0.618mA, be less than 50mA, therefore, the running status of this alternating-current lightning arrestor is good.

Above-listed detailed description is illustrating for possible embodiments of the present invention, 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 (10)

1. an alternating current circuit alternating-current lightning arrestor electrification detection system, is characterized in that, it comprises:

High voltage AC bus (1), for generation of ac voltage signal;

Exchanging wire (71), for connecting high voltage AC bus (1) and shaft tower (2), realizing electric energy conveying;

Shaft tower (2), for carrying out shoring of foundation to interchange wire (71);

Bus-bar potential transformer (3), primary side and the high voltage AC bus (1) of described bus-bar potential transformer (3) are electrically connected, for converting described ac voltage signal, the alternating voltage output signal after the secondary side of bus-bar potential transformer (3) produces a conversion;

Alternating-current lightning arrestor (4), be installed on described shaft tower (2) side, the primary side of described alternating-current lightning arrestor (4) with exchange wire (71) and be electrically connected, form current signal measurement point, described ac voltage signal produces an ac current signal in the ground side of alternating-current lightning arrestor (4) after flowing through alternating-current lightning arrestor (4) by interchange wire (71);

Voltage sample module (5), the input end of described voltage sample module (5) and the secondary side of bus-bar potential transformer (3) are electrically connected, for carrying out multiple repairing weld to described alternating voltage output signal, obtain the voltage data sequence of sampling;

Current sample module (6), the input end of described current sample module (6) and the ground loop of alternating-current lightning arrestor (4) are electrically connected, for carrying out multiple repairing weld to described ac current signal, obtain the current data sequence of sampling, the quantity of described current data sequence and voltage data sequence is equal;

Exchange conductor impedance parameters measurement module (7), for measuring the current vector and voltage vector that exchange wire (71), to obtain the impedance parameter exchanging wire (71);

Busbar current transformer (10), primary side and the high voltage AC bus (1) of described busbar current transformer (10) are electrically connected, for producing a bus current signal at the secondary side of busbar current transformer (10);

Processing module, for receiving described current data sequence, voltage data sequence, the current vector exchanging wire (71) and voltage vector and bus current signal and calculating it, to judge the reliability of alternating-current lightning arrestor.

2. alternating current circuit according to claim 1 alternating-current lightning arrestor electrification detection system, it is characterized in that, described current sample module (6) comprises the first current sensor (61), first a/d conversion device (62), first central processing unit (63) and the first wireless transceiver terminal (64), the sampling probe of described first current sensor (61) is serially connected in the ground loop of alternating-current lightning arrestor (4), the output terminal of described first current sensor (61) is connected with the input end of the first central processing unit (63) by the first a/d conversion device (62), for the first current sensor (61) is sent to the first central processing unit (63) to the current data sequence that described ac current signal carries out multiple repairing weld acquisition after analog to digital conversion, the output terminal of described first central processing unit (63) and the input end of the first wireless transceiver terminal (64) are electrically connected, for the current data sequence after the analog to digital conversion obtained is sent to processing module by the first wireless transceiver terminal (64).

3. alternating current circuit according to claim 2 alternating-current lightning arrestor electrification detection system, it is characterized in that, described voltage sample module (5) comprises voltage sensor (51), second a/d conversion device (52), second central processing unit (53) and the second wireless transceiver terminal (54), the sampling probe of described voltage sensor (51) is serially connected in the secondary side of bus-bar potential transformer (3), the output terminal of described voltage sensor (51) is connected with the input end of the second central processing unit (53) by the second a/d conversion device (52), for voltage sensor (51) is sent to the second central processing unit (53) to the voltage data sequence that described alternating voltage output signal carries out multiple repairing weld acquisition after analog to digital conversion, the output terminal of described second central processing unit (53) and the input end of the second wireless transceiver terminal (54) are electrically connected, for the voltage data sequence after the analog to digital conversion obtained is sent to processing module by the second wireless transceiver terminal (54).

4. alternating current circuit according to claim 3 alternating-current lightning arrestor electrification detection system, it is characterized in that, described interchange wire (71) comprises A phase conductor, B phase conductor and C phase conductor, wherein, the disconnected chalaza that A phase conductor, B phase conductor and C phase conductor are formed with high voltage AC bus (1) is respectively designated as D point, E point and F point respectively, the primary side of described alternating-current lightning arrestor (4) with exchange current signal measurement point that wire (71) formed and lay respectively at X point, Y point and Z point on A phase conductor, B phase conductor and C phase conductor; Disconnected conjunction place between described A phase conductor, B phase conductor and C phase conductor and high voltage AC bus (1) is respectively equipped with K switch 1, K switch 2 and K switch 3, and described X point, Y point and exchanging on wire (71) between Z point with shaft tower (2) are respectively equipped with K switch 4, K switch 5 and K switch 6.

5. alternating current circuit according to claim 4 alternating-current lightning arrestor electrification detection system, it is characterized in that, described interchange conductor impedance parameters measurement module (7) comprises measures power supply (72), current measuring device (73), voltage measuring apparatus (74), earthing device (75), the 3rd a/d conversion device (76), the 3rd wireless transceiver terminal (77); Wherein, the three-phase output end measuring power supply (72) is connected to D point, E point and F point respectively by three phase terminals, described three phase terminals is connected with current measuring device (73) and voltage measuring apparatus (74); Described earthing device (75) comprises K switch 7, K switch 8, K switch 9 and K10, and one end of described K switch 9, K switch 8, K switch 7 is connected to X point, Y point and Z point respectively, and the other end of three is all by K switch 10 ground connection; The output terminal of described current measuring device (73) and voltage measuring apparatus (74) all via the 3rd wireless transceiver terminal (77) the two is recorded current vector respectively by the 3rd a/d conversion device (76) and voltage vector is sent to processing module.

6. alternating current circuit according to claim 5 alternating-current lightning arrestor electrification detection system, it is characterized in that, described processing module comprises:

Wireless transceiver master station (8), the input end of described wireless transceiver master station (8) respectively with the first wireless transceiver terminal (64), the output terminal wireless connections of the second wireless transceiver terminal (54) and the 3rd wireless transceiver terminal (77), the output terminal of described wireless transceiver master station (8) is connected with server (9), for setting up between current sample module (6) and server (9), between voltage sample module (5) and server (9), and the communication exchanged between conductor impedance parameters measurement module (7) and server (9),

Server (9), for receiving from the current data sequence of wireless transceiver master station (8), voltage data sequence, the current vector exchanging wire and voltage vector and bus current signal, and by calculating the reliability judging alternating-current lightning arrestor.

7. alternating current circuit according to claim 6 alternating-current lightning arrestor electrification detection system, it is characterized in that, described wireless transceiver master station (8), the first wireless transceiver terminal (64), the second wireless transceiver terminal (54) and the 3rd wireless transceiver terminal (77) are wireless router.

8. the alternating current circuit alternating-current lightning arrestor electrification detection system according to any one of claim 1-7, it is characterized in that, the secondary side of described busbar current transformer (10) is connected to the input end of one second current sensor (101), described bus current signal is sent to processing module by the 4th wireless transceiver terminal (104) by one the 4th central processing unit (103) after carrying out analog to digital conversion by one the 4th a/d conversion device (102) by the output terminal of the second current sensor (101).

9. an alternating current circuit alternating-current lightning arrestor live detection method, it is characterized in that, it comprises the following steps:

Step 1, carry out the measurement of AC line voltage vector sum current vector by exchanging conductor impedance parameters measurement module, and calculating interchange conductor impedance parameter, described interchange conductor impedance parameter is the impedance parameter of the alternating current circuit between high voltage AC bus and current signal measurement point; Described current signal measurement point is the contact that the primary side of the alternating-current lightning arrestor being positioned at shaft tower side is connected on alternating current circuit; Described interchange wire comprises A phase conductor, B phase conductor and C phase conductor, wherein, the disconnected chalaza that A phase conductor, B phase conductor and C phase conductor are formed with high voltage AC bus is respectively designated as D point, E point and F point respectively, the primary side of alternating-current lightning arrestor with exchange current signal measurement point that wire formed and lay respectively at X point, Y point and Z point on A phase conductor, B phase conductor and C phase conductor; Described A phase conductor, B phase conductor and disconnected conjunction place between C phase conductor and high voltage AC bus are respectively equipped with K switch 1, K switch 2 and K switch 3, and described X point, Y point and Z point are respectively equipped with K switch 4, K switch 5 and K switch 6 with exchanging on wire between shaft tower; Described interchange conductor impedance parameters measurement module comprises measures power supply, current measuring device, voltage measuring apparatus, earthing device; Wherein, the three-phase output end measuring power supply is connected to D point, E point and F point respectively by three phase terminals, and described three phase terminals are connected with current measuring device and voltage measuring apparatus; Described earthing device comprises K switch 7, K switch 8, K switch 9 and K10, and one end of described K switch 9, K switch 8, K switch 7 is connected to X point, Y point and Z point respectively, and the other end of three is all by K switch 10 ground connection;

Described step 1 comprises the following steps:

Step 11, cut-off switch K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10, obtain current vector by current measuring device voltage vector is obtained by voltage measuring apparatus now impedance Z is calculated according to formula (1) ₁:

$Z_1=\frac{{\stackrel{\·}{U}}_1}{{\stackrel{\·}{I}}_1}---\left(1\right)$

Step 12, cut-off switch K1, K2, K3, K4, K5 and K6, Closing Switch K7, K8, K9 and K10, obtain current vector by current measuring device voltage vector is obtained by voltage measuring apparatus now impedance Z is calculated according to formula (2) ₀:

$Z_0=\frac{{\stackrel{\·}{U}}_0}{{\stackrel{\·}{I}}_0}---\left(2\right);$

Step 2, the sampling probe of the first current sensor is taked ac current signal from the ground loop of alternating-current lightning arrestor, after analog to digital conversion, form current data sequence I (k); Alternating voltage is taked to output signal from bus-bar potential transformer secondary side the sampling probe of voltage sensor, after analog to digital conversion, coating-forming voltage data sequence U (k); The sampling probe of the second current sensor is taked bus ac current signal from busbar current transformer secondary side, after analog to digital conversion, forms bus current data sequence I ¹(k); The sample frequency of the sampling probe of the first current sensor, the sampling probe of the second current sensor and the sampling probe of voltage sensor is 500Hz, and the sampling number of three is 500, and wherein, the value of k is 0,1,2 ... 499;

Step 3, through type (3)-(5), respectively to described current data sequence I (k), voltage data sequence U (k), bus current data sequence I ¹k () arranges respectively, form new current data sequence I ₀(k), voltage data sequence U ₀(k) and bus current data sequence

$I_0\left(k\right)=\underset{n=0}{\overset{499}{\mathrm{\Σ}}}I\left(n\right)e^{-j\frac{2\mathrm{\πk}}{500}}---\left(3\right)$

$U_0\left(k\right)=\underset{n=0}{\overset{499}{\mathrm{\Σ}}}U\left(n\right)e^{-j\frac{2\mathrm{\πk}}{500}}---\left(4\right)$

$I_0^1\left(k\right)=\underset{n=0}{\overset{499}{\mathrm{\Σ}}}{I}^1\left(n\right)e^{-j\frac{2\mathrm{\πk}}{500}}---\left(5\right)$

Voltage data sequence U in step 4, formula (4) ₀k () is the magnitude of voltage of high voltage AC bus side, need the alternating current circuit lightning arrester magnitude of voltage being converted into shaft tower side, and reduction formula is such as formula shown in (6):

${U_0}^{\′}\left(k\right)=\frac{U_0\left(k\right)\sqrt{Z_0/Z_1}}{250}+\frac{I_0^1\left(k\right)\sqrt{Z_0{Z}_1}\sinh \left({\coth }^{-1}\sqrt{Z_0/Z_1}\right)}{250}---\left(6\right)$

In formula (6), sinh is hyperbolic sine function, coth ^-1for the inverse function of cosh;

Step 5, based on formula (2)-(6), extract the 50Hz of alternating-current lightning arrestor, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, the resistance value of 400Hz, 450Hz and angle, respectively such as formula shown in (7) and formula (8):

$Z_l=\frac{{\left(\left(\mathrm{Re}\left({U_0}^{\′}\left(l\right)\right)\right)\right)}^2+{\left(\mathrm{Im}{\left({U_0}^{\′}\left(l\right)\right))}^2\right)}^{\frac{1}{2}}*e^{j\arctan \left(\frac{\mathrm{Im}\left(U_0^{\′}\left(l\right)\right)}{\mathrm{Re}\left(U_0^{\′}\left(l\right)\right)}\right)}}{{({\left(\mathrm{Re}\left(I_0\left(l\right)\right)\right)}^2+{\left(\mathrm{Im}\left(I_0\left(l\right)\right)\right)}^2)}^{\frac{1}{2}}*e^{j\arctan }\left(\frac{\mathrm{Im}\left(I_0\left(l\right)\right)}{\mathrm{Re}\left(I_0\left(l\right)\right)}\right)}---\left(7\right)$

${\mathrm{\θ}}_l=\arctan \left(\frac{\mathrm{Im}\left(I_0\left(l\right)\right)}{\mathrm{Re}\left(I_0\left(l\right)\right)}\right)---\left(8\right)$

In formula (7) and formula (8), l gets 50,100,150,200,250,300,350,400 and 450Hz respectively;

The reliability of step 6, judgement alternating-current lightning arrestor, the method for judgement:

When meeting following condition for the moment, having a power failure and changing described alternating-current lightning arrestor:

The current value I of 50Hz ₀(50) 50mA is greater than;

The resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change be greater than 100%;

When meeting following condition for the moment, the cycle of the adjacent secondary live detection of reduction alternating-current lightning arrestor is to strengthen monitoring:

The resistance value Z of the 50Hz of alternating-current lightning arrestor between adjacent twice live detection ₅₀rate of change be greater than 50% and be less than 70%;

Between adjacent twice live detection, the change of the angle of 50Hz, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, 400Hz and 450Hz is all greater than 10 °.

10. alternating current circuit according to claim 9 alternating-current lightning arrestor live detection method, it is characterized in that, if the 50Hz of alternating-current lightning arrestor, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz, 350Hz, when the resistance value of 400Hz, 450Hz and angle are for measuring first, then only consider the current value I of 50Hz ₀(50) whether 50mA is greater than.