CN101576595A - Online monitoring and electricity testing method of switch cabinet lightning arrester and device for realizing same - Google Patents
Online monitoring and electricity testing method of switch cabinet lightning arrester and device for realizing same Download PDFInfo
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- CN101576595A CN101576595A CNA2009100596184A CN200910059618A CN101576595A CN 101576595 A CN101576595 A CN 101576595A CN A2009100596184 A CNA2009100596184 A CN A2009100596184A CN 200910059618 A CN200910059618 A CN 200910059618A CN 101576595 A CN101576595 A CN 101576595A
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Abstract
The invention discloses an online monitoring method of a switch cabinet lightning arrester, a double indirect electricity testing method of equipment at the wire outgoing side of a high-voltage switch cabinet, and a device for realizing the method. In the method and a matched device thereof, a voltage signal and a current signal are simultaneously taken as signal monitoring input signals of the switch cabinet lightning arrester, the input signal is subjected to digitalized processing so as to display a specific value of a primary voltage of the equipment at the wire outgoing side in real time, to be capable of collecting the action times of the lightning arrester in a switch cabinet, the accurate time of each action, the leakage full current and resistance current of each phase of the lightning arrester, and automatically recording the values of the full current and resistance current in a set time. The device is provided with three current indicating lamps which are directly connected with a three-phase lightning arrester. The current indicating lamps can be turned on by the leakage current of the lightning arrester directly so as to achieve the purpose of indicating electricity. The leakage current indicating lamps of the lightning arrester and line primary voltage form double indirect electricity testing so as to reach the standard of switch cabinet indirect electricity testing.
Description
Technical field
The present invention relates to the method for a kind of monitoring and electrical verification, be specifically related to a kind of method and the method for the dual indirect electrical verification of high-tension switch cabinet outlet side apparatus and device of realizing this method of high-tension switch cabinet lightning arrester on-line monitoring.
Background technology
The 10kV-35kV high-tension switch cabinet is an electrical equipment the most frequently used in the transformer station.But in actual applications, lack the detection means and of not having a power failure to occurring effectively dual indirect electroscopic device of side apparatus in the high-tension switch cabinet to lightning arrester in the high-tension switch cabinet.Have following problem in the existing cubicle switch cabinet: 1, lightning arrester counter, Leakage Current table or running LED are installed in the high-tension switch cabinet, are unfavorable for substation operation personnel's walkaround inspection.2, be not easy to after break down in its display part safeguard and change, need after switch cubicle and the power failure of outlet side, could safeguard and change.3, reveal the total current capacity current with lightning arrester and add the operation conditions that current in resistance property is judged lightning arrester, can not accurately reflect the physical features of lightning arrester operation conditions.Because capacity current is much larger than current in resistance property, and the preventative rules of power equipment require to detect the variation of arrester resistance current value.4, the lightning arrester counter only can write down the action frequency of lightning arrester, can not write down the time of the each action of lightning arrester, is unfavorable for the analysis of accident.5, the charged display device of outlet side on the existing switch cubicle can only or have, not have electricity demonstration reflection equipment charged state with pilot lamp, and can not be comparatively accurately, real-time and dynamic reflects the actual voltage value of equipment, judges whether the charged inconvenience of bringing accurately for the operations staff.After disconnecting when the line side switches disconnecting link, there is generator for electricity generation that electric energy is sent back on the line, but the voltage of sending back is lower, causes the indication of charged indicating device not obvious, thereby causes charged pernicious maloperation of drawing ground cutter ground connection even life casualty accident etc.6, since existing only be the indirect electroscopic device in single principle and loop, this also is the defective of a maximum of the charged display device existence of present switch cubicle, can only realize the indirect electrical verification of substance exactly, be difficult to satisfy the high reliability request of the indirect electrical verification of high-tension switch cabinet.This does not meet the electric power safety specified standard: when adopting indirect electrical verification, should have two and plural indication to take place change simultaneously at least.
The applying date is on January 26th, 2002, notification number is CN1267798C, name is called " establishes the switch cubicle of monitoring device or the Chinese invention patent of control box arrangement; disclose the switch cubicle that a kind of inside has monitoring device; it is the problem of also transmitting about the temperature in the switch cubicle, humidity detection that this patent emphasis solves, but can not solve above-mentioned several problem in having.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, and a kind of novel switch cubicle electrical verification lightning arrester on-Line Monitor Device is provided.This device can be in the on-the-spot running environment of high pressure effective isolation high pressure primary equipment, the dual indirect electrical verification of carrying out different principle and loop that can be safe and reliable, lightning arrester Leakage Current, current in resistance property, line side equipment voltage and the discharge time measured are true and reliable, and have good anti-electromagnetic field jamming performance.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of realization switch cabinet lightning arrester on-line monitoring and electricity-testing method are provided, may further comprise the steps 1 to step 5:
Step 1: the capacitive pillar insulation sensor that commonly used and switch cubicle high voltage display device in the present switch cubicle are used is as the voltage signal input block U of switch cabinet lightning arrester digital monitoring, utilize capacitance partial pressure from this voltage signal input block with three-phase voltage signal
Draw, simultaneously with the input block of switch cabinet lightning arrester as current signal, from the current signal input block with the three-phase Leakage Current signal of lightning arrester (
) draw; Utilize the three-phase Leakage Current signal of lightning arrester
Make three light emitting diode L1, L2, L3 luminous respectively;
Step 2: simulate voltage signal with above-mentioned
And analog current signal
Input current, voltage signal acquisition unit, electric current, voltage signal acquisition unit carry out outputing on the data bus after the signal digitalized processing;
Step 3: central processing controller MCU receives the digitized signal that draws in the step 2, can directly draw or computational analysis goes out
The leakage total current effective value and the primary voltage effective value of phase angle difference φ a, φ b, φ c and every phase;
Step 4: the data that draw in the step 3 are shown by liquid crystal indicator;
Step 5: the primary voltage value of the demonstration on the luminous signal of three light emitting diode L1, L2, L3 in the step 1 and the liquid crystal indicator is cooperated contrast, reach the effect of dual indirect electrical verification.
When carrying out above-mentioned steps 1, series connection one heavy-current discharge protective device Ih on the lightning arrester loop, every phase Ih provides a switch contact K
A, K
B, K
CGive discharge time collecting unit 3.When lightning arrester when discharge action, the switch contact closure of Ih, the discharge time collecting unit converts closing of contact action to signal that a level changes and inputs to MCU and count.
Further method is, in step 2, described electric current, voltage signal acquisition unit carry out digitized processing to signal, is that direct analytical calculation draws
The total current effective value and the voltage effective value of phase angle difference φ a, φ b, φ c and every phase send central processing controller MCU to;
In step 3, central processing controller MCU receives the digitized signal that draws in the step 2, and central processing controller MCU calculates the current in resistance property value of every phase etc. by the total current value of every phase and the phase angle difference of every phase.
Perhaps the present invention can also be in step 2, described electric current, voltage signal acquisition unit carry out digitized processing to signal, be meant that electric current, voltage signal acquisition unit are separately converted to digital signal by periodic sampling and analog to digital conversion with analog voltage signal and analog current signal, send central processing controller MCU then to and calculate;
MCU receives the digitized signal that draws in the step 2 in the step 3, by MCU corresponding voltage in three phases digital signal and current digital signal is carried out mathematical analysis calculating, obtains phase angle difference φ a, φ b, φ c and every total current effective value and voltage effective value mutually; Simultaneously, MCU calculates the current in resistance property value of every phase at least by the total current value of every phase and the phase angle difference of every phase.
The further again technical scheme of the present invention is:
In step 3, MCU by reality once the magnitude of voltage and the magnitude of voltage that draws of charged side be divided by, can draw the voltage change ratio coefficient of voltage signal input block U, show by step 4 again after utilizing this coefficient that the magnitude of voltage that obtains is revised.
The present invention heavy-current discharge protective device Ih that can also connect on the lightning arrester loop, every phase Ih provides a switch contact K
A, K
B, K
CGive the discharge time collecting unit; When lightning arrester when discharge action, the switch contact closure of Ih, the discharge time collecting unit converts closing of contact action to signal that a level changes and inputs to MCU and count.
The present invention also comprises the monitoring device of realizing said method, and this device is divided into three unit at least,
First module is voltage, current acquisition unit, links to each other with circuit with voltage, current signal input block, is responsible for gathering the current/voltage simulating signal, and the data after simultaneously acquisition process being finished are exported on data bus with digital form;
Unit second is a MCU band liquid crystal indicator, and MCU partly links to each other with first by data bus, is responsible for being shown by display device then by predetermined data bus format reading of data successively and processing;
Unit the 3rd is the discharge time collecting unit, links to each other with Ih by circuit, be responsible for to gather the closure signal of switch contact, and switching signal is converted to the level translation signal imports to MCU, carries out the discharge time counting by MCU.
Further technical scheme is: described voltage, current acquisition unit comprise three groups of capacitor C 1, C2 and three-phase electric energy acquisition chip, and three groups of capacitor C 1, C2 are connected on voltage output unit respectively
Secondary circuit in, three-phase is simulated voltage signal
Send into the three-phase electric energy acquisition chip after the dividing potential drop.
And described three-phase voltage acquisition chip is electric energy computation chip or three electric energy computation chip or the AD conversion chips with automatic collection changing voltage current phase that can gather the three-phase voltage current phase simultaneously.
Described discharge time collecting unit comprises photoisolator GG of every phase, the input end of this photoisolator GG and the K of heavy-current discharge protective device
A, K
B, K
CAcquisition port link to each other, output termination voltage comparator or Schmidt's reverser, import a level variable signal by photoisolator GG to voltage comparator or Schmidt's reverser and import a level variable signal by voltage comparator or Schmidt's reverser to MCU again, and cause MCU and count.
Also be in series with LED light emitting diode L1, L2, L3 on the leakage current loop of described lightning arrester, LED light emitting diode L1, L2, L3 other end ground connection; Perhaps series connection one current transformer on lightning arrester Leakage Current loop inserts LED light emitting diode L1, L2, L3 on the secondary current loop of mutual inductor.
Certainly MCU links to each other with liquid crystal display by liquid crystal control interface unit YJDY at last.
Last liquid crystal display can also be installed in outside the switch cubicle housing.And the MCU part of voltage, current acquisition unit and second unit MCU band liquid crystal indicator, be the microprocessor that carries the AD acquisition interface, for example a DSP.
Principle of work of the present invention is as follows:
The present capacitive pillar insulation sensor that is used with the switch cubicle high voltage display device commonly used in the switch cubicle, as the CG series sensor as the three-phase voltage input block
The voltage of a charging equipment is isolated extraction through electric capacity convert the output of secondary voltage signal to, again the capacitor C 1 by two series connection, C2 with the secondary voltage dividing potential drop after, handling the voltage acquisition end that back output millivolt signal is given first of the present invention electric energy computation chip or A/D acquisition chip by filtering amplification etc.Simultaneously, with the lightning arrester in the switch cubicle and and the heavy-current discharge protective device that is cascaded of lightning arrester as the three-phase current input block
Leakage full current signal input with lightning arrester, by being connected on the small resistor R1 on the input Leakage Current loop, current signal is become the millivolt voltage signal by treatment conversion such as filtering amplifications, export to the current acquisition end of this device electric energy computation chip or A/D acquisition chip.After collecting voltage signal and current signal at the same time, electric energy computation chip or A/D acquisition chip calculate or analog to digital conversion automatically, electric energy computation chip calculates the phase angle difference of the effective value and the electric current and voltage of electric current and voltage, by data bus, digital signal is sent to the MCU of this device second portion then; Or the A/D acquisition chip carries out analog to digital conversion and periodic sampling to voltage and current signal, digital signal is sent to the MCU of this device second portion.After MCU receives the three-phase current voltage digital signal that the electric current and voltage collecting unit passes back by data bus, if carrying out calculated signals, previous step do not handle, also can corresponding voltage in three phases and current signal be carried out fast fourier transform calculating and integral and calculating, can obtain phase angle difference φ a, φ b, φ c and every total current effective value and voltage effective value mutually equally by MCU.Simultaneously, MCU can calculate the current in resistance property value of every phase by the phase angle difference of total current value and every phase, and by liquid crystal control interface unit YJDY three-phase total current, current in resistance property, the voltage value of lightning arrester directly is presented on the liquid crystal display.
In addition, three-phase current input block
Except that the leakage total current of input lightning arrester, also the Ih by three-phase provides a pair of passive switching signal acquisition interface K to device
A, K
B, K
CPassive switching signal acquisition interface K
A, K
B, K
CThe photoisolator GG input end of this device of termination discharge time collecting unit, the other end inserts the common of electric current and voltage signal.When the leakage conductor action; heavy-current discharge protective device Ih in the current signal input block is with the excess current the earth of directly releasing; the switch contact closure of its switching signal acquisition interface of while; photoisolator GG input end conducting over the ground in the feasible electricity time counting collection unit; photoisolator GG is by the current signal of input; make phototriode conducting wherein; light becomes the INT interruption input port that low level enters MCU every the output signal of GG by high level; the interruption counting procedure that causes MCU thus carries out the accumulative total of corresponding every phase discharge number of times; simultaneously MCU reads clock data with the clock chip of transformer station gps clock signal Synchronization by clock chip predetermined data bus, is stored in together with discharge time among the ROM of MCU.Collection lightning arrester action frequency and the function of time have just been reached by said process.
The three-phase current input block
The leakage total current of input lightning arrester, not only to provide current signal to gather to voltage, current acquisition unit, the LED light emitting diode L1 that also utilizes Leakage Current directly to light simultaneously to be connected on the Leakage Current loop, L2, L3 or as the former limit of current transformer allow the secondary of mutual inductor light LED.When the operations staff carries out dual indirect electrical verification, check the numerical value of the voltage signal that passes through the input of CG series sensor on the liquid crystal display on the one hand, check whether L1, L2, L3 light on the one hand, so just can pass through the double check of the voltage of monitoring of lightning arrester loop current and CG sensor loop and judge whether line side equipment is charged.
In sum: the invention has the beneficial effects as follows:
1, the concrete numerical value of the primary voltage of the real-time circuit outlet side apparatus of energy, the numerical accuracy error of its demonstration are no more than real-time voltage ± 150V.
2, can gather the action frequency of lightning arrester in the switch cubicle and the precise time that at every turn moves, the leakage total current of every phase lightning arrester, current in resistance property, the time period that can pass through to be provided with is write down the value of total current and current in resistance property automatically.
3, having three alternator indicators directly is connected with three-phase lightning protector.Alternator indicator can directly be lighted by the leakage current of lightning arrester, thereby reach electric purpose of indicating is arranged.Simultaneously, leakage current of an arrester pilot lamp and circuit primary voltage value have constituted dual indirect electrical verification, have reached the industry standard of the indirect electrical verification of switch cubicle.
Solved the electrical verification display device of using on the present switch cubicle and all do not realized dual indirect electrical verification problem, electrification in high voltage has not been realized quantitative demonstration, problems such as the monitoring of lightning arrester is comprehensive inadequately.
Description of drawings
Fig. 1 is the schematic block circuit diagram of monitoring device of the present invention;
Fig. 2 is the circuit theory diagrams of the specific embodiment of the present invention;
Fig. 3 is the amplification circuit diagram of discharge time collecting unit among Fig. 2 of the present invention;
Fig. 4 is the amplification circuit diagram of MCU band liquid crystal display unit cell among Fig. 2 of the present invention;
Fig. 5 is the amplification circuit diagram of voltage in the diagram of the present invention, electric current input block and collecting unit;
Fig. 6 is the vector relations figure of lightning arrester total current, current in resistance property, primary voltage;
Fig. 7 is the concrete components and parts figure of LCD LCDs of the present invention.
Embodiment
The present invention is further elaborated below in conjunction with accompanying drawing.The concrete embodiment that realizes the method for the invention device of introducing: as depicted in figs. 1 and 2, device is divided into three unit,
First module is voltage, current acquisition unit 1, link to each other with circuit with voltage, current signal input block, be responsible for gathering the current/voltage simulating signal, simultaneously A/D sampling and conversion carried out in simulation, the data after finishing dealing with are exported on data bus with digital form;
Unit second is a MCU band liquid crystal indicator 2, MCU partly links to each other with first by data bus, be responsible for by predetermined data bus format reading of data successively and carry out corresponding voltage in three phases and the current signal fast fourier transform is calculated and integral and calculating, draw phase angle difference φ a, φ b, φ c and every total current effective value, current in resistance property value and voltage effective value mutually.Show by display device then;
Unit the 3rd is a discharge time collecting unit 3, link to each other with Ih in the electric current input block by circuit, be responsible for to gather the switch contact closure signal that Ih provides, and the variation that the closed action of this contact converts level signal to is imported to MCU, by MCU counting discharge time.
Liquid crystal display is mounted in outside the switch cubicle housing, and being convenient to display result is people's finding.
Fig. 4 is the circuit theory diagrams of one embodiment of the present invention, introduces the physical circuit and the principle of work of switch cabinet lightning arrester on-line monitoring of the present invention and electricity-testing method and this square law device of realization below more in detail in conjunction with Fig. 4.
As shown in Figure 4, with CG sensor commonly used in the switch cubicle as the three-phase voltage input block
The voltage of a charging equipment is isolated extraction by electric capacity convert the output of secondary voltage signal to, capacitor C 1 by two series connection, C2 with the secondary voltage dividing potential drop after, doing processing and amplifying by amplifier chip LM353, enter analog switch device ADG429BN after the signal Processing, the timesharing by ADG429BN is switched the millivolt signal that will amplify and is flowed to and follow device LM353 and carry out sending into voltage A/D acquisition chip AD977BN after the impedance matching and carry out analog to digital conversion.Lightning arrester in the switch cubicle and and the heavy-current discharge protective device that is cascaded of lightning arrester as the three-phase current input block
Leakage full current signal input with lightning arrester, on input Leakage Current loop, be in series with small resistor R1, the voltage signal that the Leakage Current that flows through on the R1 produces is done processing and amplifying by amplifier chip LM353, enter analog switch device ADG429BN after the signal Processing, the timesharing by ADG429BN is switched the millivolt signal that will amplify and is flowed to and follow device LM353 and carry out sending into voltage A/D acquisition chip AD977BN after the impedance matching and carry out analog to digital conversion.Two AD977BN chips are finished the A/D sampling and are changed the central signal processor A TMEGA64 that the back is sent to digital signal by data bus this device second portion.After ATMEGA64 receives the three-phase current voltage digital signal that the electric current and voltage collecting unit passes back by data bus, voltage and current is carried out fft algorithm to be changed, can calculate the phasing degree, multiply by the phase place cosine of an angle with electric current then, can draw the arrester resistance current of every phase, and three-phase total current, current in resistance property, voltage value directly are presented on the liquid crystal display LCD by liquid crystal control interface control chip HT1621B.
In addition, lightning arrester and protector also provide a pair of passive switching signal acquisition interface K to monitoring device except that the leakage total current of input lightning arrester
A, K
B, K
CK
A, K
B, K
CA termination photoisolator PC817 input end, the other end inserts the common of electric current and voltage signal.When the leakage conductor action; heavy-current discharge protective device Ih is with the excess current the earth of directly releasing; the switch contact closure of its switching signal acquisition interface of while; the input end of photoisolator PC817 in the feasible electricity time counting collection unit is by pull-up resistor R2 conducting over the ground; PC817 is by the current signal of input; make phototriode conducting wherein, output signal becomes low level by high level.Its level signal is through the processing of RC filtering circuit and two Schmidt's reverser 74HC14, become at last the INT interruption input port that low level signal enters middle ATMEGA64 again, the interruption counting procedure that causes ATMEGA64 thus carries out the accumulative total of corresponding every phase discharge number of times, simultaneously ATMEGA64 reads clock data with the clock chip DS1302Z of transformer station gps clock signal Synchronization by data bus, is stored in together with discharge time among the ROM of ATMEGA64.Collection lightning arrester action frequency and the function of time have just been reached by said process.Simultaneously, ATMEGA64 changes Transistor-Transistor Logic level chip SP3232EEN by PC817 with serial ports and is connected, and the data that are stored among the ROM are passed to host computer by the RS232 oral instructions.
In addition, the leakage total current of lightning arrester not only will provide signal to gather to voltage, current acquisition unit, the LED light emitting diode that also utilizes Leakage Current directly to light simultaneously to be connected on the Leakage Current loop.When the operations staff carries out dual indirect electrical verification, check the numerical value of the voltage signal that passes through the input of CG series sensor on the liquid crystal display on the one hand, on the one hand check whether L1, L2, L3 light, so just can monitor and the double check of the voltage in circuit sensor " CG " loop is judged that line side equipment is whether charged and shown by the lightning arrester loop current.Therefore satisfied in " State Grid Corporation of China's electric power safety working regulation " standard " 4.3.3 bar " about indirect electrical verification, the i.e. regulation that ", and should have two and above indication to take place change simultaneously at least " to carrying out the equipment of direct electrical verification; can carry out indirect electrical verification; promptly check the mechanical indicating positions of disconnector disconnecting link; electric indication; the variation of instrument and charged display device indication.
Certain physical circuit embodiment of the present invention never only limits to above-mentioned optimal way, and all physical circuit designs that can reach above-mentioned each Elementary Function module all belong to the simple transformation of above-mentioned embodiment.
Claims (12)
1. switch cabinet lightning arrester on-line monitoring and electricity-testing method is characterized in that through step 1 to step 5:
Step 1: the capacitive pillar insulation sensor that will be used with the switch cubicle high voltage display device is as the voltage signal input block (U) of switch cabinet lightning arrester digital monitoring, utilize capacitance partial pressure from this voltage signal input block with three-phase voltage signal
Draw, simultaneously with the input block (I) of switch cabinet lightning arrester as current signal, from the current signal input block with the three-phase Leakage Current signal of lightning arrester
Draw; Utilize the three-phase Leakage Current signal of lightning arrester
Make that respectively three light emitting diodes (L1, L2, L3) are luminous;
Step 2: simulate voltage signal with above-mentioned
And analog current signal
Input current, voltage signal acquisition unit (1), signal digitalized processing is carried out in electric current, voltage signal acquisition unit (1), obtains outputing on the data bus after the digitized signal;
Step 3: central processing controller (MCU) receives the digitized signal that draws the step 2 from data bus, directly draws or computational analysis goes out
The leakage total current effective value and the primary voltage effective value of phase angle difference φ a, φ b, φ c and every phase;
Step 4: the data that draw in the step 3 are shown by display device;
Step 5: the primary voltage value of the demonstration on the luminous signal of three light emitting diodes (L1, L2, L3) in the step 1 and the liquid crystal indicator is cooperated contrast.
2. a kind of switch cabinet lightning arrester on-line monitoring as claimed in claim 1 and electricity-testing method is characterized in that:
In step 2, digitized processing is carried out to signal in described electric current, voltage signal acquisition unit (1), is that direct analytical calculation draws
The total current effective value and the voltage effective value of phase angle difference φ a, φ b, φ c and every phase send central processing controller (MCU) to;
In step 3, central processing controller MCU receives the digitized signal that draws in the step 2, and central processing controller (MCU) calculates the current in resistance property value of every phase etc. by the total current value of every phase and the phase angle difference of every phase.
3. a kind of switch cabinet lightning arrester on-line monitoring as claimed in claim 1 and electricity-testing method is characterized in that:
In step 2, digitized processing is carried out to signal in described electric current, voltage signal acquisition unit (1), be meant that electric current, voltage signal acquisition unit (1) are separately converted to digital signal by periodic sampling and analog to digital conversion with analog voltage signal and analog current signal, send central processing controller MCU then to and calculate;
MCU receives the digitized signal that draws in the step 2 in the step 3, by MCU corresponding voltage in three phases digital signal and current digital signal is carried out mathematical analysis calculating, obtains phase angle difference φ a, φ b, φ c and every total current effective value and voltage effective value mutually; Simultaneously, MCU calculates the current in resistance property value of every phase at least by the total current value of every phase and the phase angle difference of every phase.
4. as claim 2 or 3 described a kind of switch cabinet lightning arrester on-line monitoring and electricity-testing methods, it is characterized in that: in step 3, once the magnitude of voltage and the magnitude of voltage that draws of charged side are divided by MCU by reality, can draw the voltage change ratio coefficient of voltage signal input block (U), show by step 4 again after utilizing this coefficient that the magnitude of voltage that obtains is revised.
5. a kind of switch cabinet lightning arrester on-line monitoring as claimed in claim 1 and electricity-testing method is characterized in that: series connection one heavy-current discharge protective device (Ih) on the lightning arrester loop, every phase (Ih) provides a switch contact (K
A, K
B, K
C) to discharge time collecting unit (3); When lightning arrester when discharge action, switch contact closure (Ih), discharge time collecting unit (3) converts closing of contact action to signal that a level changes and inputs to MCU and count.
6. monitoring device of realizing switch cabinet lightning arrester on-line monitoring as claimed in claim 1 and electricity-testing method, this device is divided into three unit at least, it is characterized in that:
First module is voltage, current acquisition unit (1), links to each other with circuit with voltage, current signal input block, is responsible for acquisition process current/voltage simulating signal, and the signal after simultaneously acquisition process being finished is exported on data bus with digital form;
Unit second is a MCU band liquid crystal indicator (2), and MCU links to each other with first by data bus, is responsible for being shown by display device then by predetermined data bus format reading of data successively and processing;
Unit the 3rd is discharge time collecting unit (3), links to each other by the switch contact of circuit with (Ih), be responsible for to gather the closure signal of switch contact, and switching signal is converted to the level translation signal imports to MCU, carries out the discharge time counting by MCU.
7. monitoring device as claimed in claim 6 is characterized in that: described voltage, current acquisition unit
(1) voltage acquisition unit in comprises three groups of electric capacity (C1, C2) and three-phase electric energy acquisition chip, and three groups of electric capacity (C1, C2) are connected on voltage output unit respectively
Secondary circuit in, three-phase is simulated voltage signal
Send into the three-phase electric energy acquisition chip after the dividing potential drop; The current acquisition unit then is to count protector with three-phase current signal with the electric current that line is connected below lightning arrester
Draw, be connected in the three-phase electric energy acquisition chip.
8. described monitoring device as claimed in claim 7 is characterized in that: described three-phase electric energy acquisition chip is the electric energy computation chip that can gather the three-phase voltage current phase simultaneously or three electric energy computation chips with automatic collection changing voltage current phase or AD conversion chip etc.
9. monitoring device as claimed in claim 6 is characterized in that: described discharge time collecting unit (3) comprises a photoisolator of every phase (GG), the input end of this photoisolator (GG) and (K of heavy-current discharge protective device
A, K
B, K
C) acquisition port link to each other, output termination voltage comparator or Schmidt's reverser, import a level variable signal by photoisolator (GG) to voltage comparator or Schmidt's reverser and import a level variable signal by voltage comparator or Schmidt's reverser to MCU again, and cause MCU and count.
10. monitoring device as claimed in claim 6 is characterized in that: be in series with LED light emitting diode (L1, L2, L3) on the leakage current loop of described lightning arrester, LED light emitting diode (L1, L2, L3) other end ground connection; Perhaps series connection one current transformer on lightning arrester Leakage Current loop inserts LED light emitting diode (L1, L2, L3) on the secondary current loop of mutual inductor.
11. monitoring device as claimed in claim 10 is characterized in that: MCU links to each other with liquid crystal display by liquid crystal control interface unit (YJDY), and liquid crystal display is installed in outside the switch cubicle housing.
12. described monitoring device as claimed in claim 6 is characterized in that: the MCU part of voltage, current acquisition unit (1) and second unit MCU band liquid crystal indicator (2) is a microprocessor that carries the AD acquisition interface.
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| CN102608409A (en) * | 2012-04-01 | 2012-07-25 | 江西省电力科学研究院 | Digital compensation method for measuring resistive current of MOA (metal oxide arrester) |
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| CN103048529A (en) * | 2011-10-14 | 2013-04-17 | 四川蓝讯宝迩电子科技有限公司 | Discharge counter with simple structure and capable of remotely transmitting data for lightning arrester |
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| CN104714128A (en) * | 2015-02-26 | 2015-06-17 | 南京南瑞继保电气有限公司 | Online arrester monitoring system |
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2009
- 2009-06-16 CN CN2009100596184A patent/CN101576595B/en not_active Expired - Fee Related
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| CN103323750A (en) * | 2013-05-30 | 2013-09-25 | 孟津县电业公司 | Detection method and device for abnormal sounds of high-voltage sealing switch cabinet or sealing bus |
| CN103675615A (en) * | 2013-11-13 | 2014-03-26 | 国家电网公司 | Ultra-wideband detection device for realizing zinc oxide arrester partial discharge detection and method thereof |
| CN104122490A (en) * | 2014-07-16 | 2014-10-29 | 国家电网公司 | Transformer bushing insulation state online monitoring device and method |
| CN104714128A (en) * | 2015-02-26 | 2015-06-17 | 南京南瑞继保电气有限公司 | Online arrester monitoring system |
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| CN105158706A (en) * | 2015-09-18 | 2015-12-16 | 成都比善科技开发有限公司 | Multifunctional power monitoring system and method for three-phase power supply |
| CN106353557A (en) * | 2016-08-09 | 2017-01-25 | 许继集团有限公司 | Method and device for measuring resistive currents of metal oxide arresters |
| CN106154015A (en) * | 2016-08-10 | 2016-11-23 | 国网江苏省电力公司南通供电公司 | Distributed power source circuit middle-placed switch cabinet miniaturized circuitry voltage collecting device |
| CN107247178A (en) * | 2017-08-02 | 2017-10-13 | 安徽明都电气有限公司 | Sensor indirect method of checking electricity system and its inspection method for electrically that KYN28-12 is switched |
| CN110471016A (en) * | 2019-09-10 | 2019-11-19 | 浙江华电器材检测研究所有限公司 | A kind of secondary control cabinet of FTU test |
| CN110471016B (en) * | 2019-09-10 | 2022-05-13 | 浙江华电器材检测研究所有限公司 | Secondary control cabinet for FTU test |
| CN112147435A (en) * | 2020-09-02 | 2020-12-29 | 国网天津市电力公司 | Online detection device for lightning arrester in switch cabinet |
| CN112684244A (en) * | 2020-11-10 | 2021-04-20 | 国网宁夏电力有限公司 | Method, medium and system for detecting action current type of lightning arrester |
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