CN206876803U - A kind of static reacance generator with lightning protection isolation with early warning of preventing fires - Google Patents
A kind of static reacance generator with lightning protection isolation with early warning of preventing fires Download PDFInfo
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- CN206876803U CN206876803U CN201720637867.7U CN201720637867U CN206876803U CN 206876803 U CN206876803 U CN 206876803U CN 201720637867 U CN201720637867 U CN 201720637867U CN 206876803 U CN206876803 U CN 206876803U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The utility model provides a kind of static reacance generator with lightning protection isolation with early warning of preventing fires, it is that a kind of ground potential counterattack isolation, fire prevention early warning, the device of SVG compensation functions, including voltage sensor, current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit, IGBT drive circuit, ground potential of having concurrently strikes back isolation module and SVG main circuits.The current detecting part of the current detecting of fault electric arc and reacance generator is shared, using same detection signal, fault electric arc analysis is carried out simultaneously using common main control unit and reactive current calculates, enable devices to be sampled out before fault electric arc characteristic current is compensated, ensure the accurate detection of fault electric arc.
Description
Technical field
Power Quality Detection administrative skill field is the utility model is related to, it is more particularly to a kind of that there is lightning protection isolation and prevent fires
The static reacance generator of early warning.
Background technology
With the continuous development of China's economy, various electrical equipments are on the increase needed for production and living, accordingly, power train
The part of system is more and more, and working condition is also more complicated and changeable, and this just greatly increases the hair of electric power system fault
Raw probability.Fault electric arc occupies sizable ratio in the electric information fire origin cause of formation, therefore, timely and accurately finds failure electricity
The appearance of arc to guarantee safe production and the lives of the people play the role of it is important.And static reacance generator (static var
Generator, SVG) new reactive-load compensation equipment is used as, with reactive current governing speed is fast, range of operation is wide, harmonic content
Low advantage, very important effect is served in terms of the quality of power supply and reactive-load compensation is improved.
Electric arc is a kind of gas discharge phenomenon, is that electric current passes through moment spark caused by some dielectrics.With me
The raising of state's economic level, domestic load increase is rapid, and distribution system also becomes increasingly complex.Because distribution line space has
Limiting, many wires bundle together in distribution box, cable insulation can be suffered damage when electricity consumption is in overload state, and then
Produce fault electric arc and trigger electrical fire.In addition, when loose contact between circuit and circuit or the influence of environment factor, use
Fault electric arc can be produced during electric break-make situation, at tie point and then triggers fire.Due to fault electric arc voltage effective value with it is non-
Voltage effective value approaches during failure, when break down electric arc when, protection device would become hard to find.
At the same time, as China is industrial constantly progressive, automatic control level also more and more higher is more and more
Distributed Control System and intelligence instrument extensive use, in order to prevent these automated productions by lightning hazards, power system
Take a large amount of lightning protection earthing measures, generally between lightning proof ground and protecting field install ground potential counterattack isolation, with it is anti-lightning strike when, by
Protecting field connection equipment is caused damage in ground potential counterattack.Ground potential counterattack isolation generally presents low in no surge current
Impedance, occur that high impedance is presented during surge current, buffer action is played to lightning current.But ground potential counterattack xegregating unit also has
Buffer action may be produced to high frequency electric caused by fault electric arc, influence the normal work of fault electric arc detection equipment.
Therefore, local potential counterattack xegregating unit, fault electric arc detection equipment, during reactive-load compensation equipment independent operating, have
May mutually have a negative impact, cause incalculable damage.
Utility model content
In order to solve problem described in background technology, the utility model provides a kind of with lightning protection isolation and early warning of preventing fires
Static reacance generator, it is that a kind of ground potential that has concurrently strikes back isolation, fire prevention early warning, the device of SVG compensation functions, by fault electric arc
Current detecting and the current detecting part of reacance generator shared, using same detection signal, use common master control
Unit processed carries out fault electric arc analysis simultaneously and reactive current calculates, and enables devices to before fault electric arc characteristic current is compensated
It is sampled out, ensures the accurate detection of fault electric arc.
In order to achieve the above object, the utility model is realized using following technical scheme：
It is a kind of with lightning protection isolation with prevent fires early warning static reacance generator, be one kind have concurrently ground potential counterattack isolation,
Prevent fires early warning, the device of SVG compensation functions, including voltage sensor, current sensor, sample circuit, signal processing circuit, master
Control MCU, arc fault warning circuit, switching value spacing output circuit, IGBT drive circuit, ground potential counterattack isolation module and
SVG main circuits.
Described main control MCU connects voltage sensor and current sensor by signal processing circuit with sample circuit, main
Control MCU is also connected with arc fault warning circuit and IGBT drive circuit, and SVG main circuits, master control are connected by IGBT drive circuit
MCU exports IGBT trigger pulse by IGBT drive circuit, controls the reactive current in SVG main circuit real-Time Compensation power networks.
Main control MCU by same voltage and current sample signal respectively by fault electric arc analysis and reactive current calculate after,
Fault electric arc warning output and IGBT control outputs are carried out respectively；Enable devices to before fault electric arc characteristic current is compensated
It is sampled out, ensures the accurate detection of fault electric arc.
The ground potential counterattack isolation module is made up of a lightning current frequency impedance device, is installed in series in lightning proof ground with protecting
Shield forms thunder and lightning insulation blocking between ground, and Low ESR is presented under normal circumstances, ensures the normal safety ground of equipment；Work as thunder and lightning
Stream from lightning protection ground terminal strike back when, under lightning current frequency, the element shows high impedance, isolates the counterattack of thunder and lightning, forces thunder and lightning
Stream can only be released to earth mat so that protection ground terminal exempt from back flashover harm, after the completion of lightning current is released, the lightning protection every
Low impedance state is returned to again from element.
Described main control MCU also controls power supply while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of breaker, cut off the electricity supply during failure.
Described SVG major loops are electronic power convertor, including multigroup IGBT units, form two level or three level three
Phase voltage source type transverter topology, can also form split-phase H bridge structural topologies.
Compared with prior art, the beneficial effects of the utility model are：
1st, a kind of static reacance generator with lightning protection isolation with early warning of preventing fires of the present utility model, by fault electric arc
The current detecting part of current detecting and reacance generator is shared, and using same detection signal, is enabled devices in failure
Arc characteristic electric current is sampled out before being compensated, and ensures the accurate detection of fault electric arc.
2nd, a kind of static reacance generator with lightning protection isolation with early warning of preventing fires of the present utility model, utilizes same master control
MCU is handled same current data, fault electric arc characteristic value and reactive current value is calculated respectively, respectively to fault electric arc report
The IGBT drive circuit of alert circuit and SVG is controlled, and is perfectly realized simultaneous while realizing two kinds of functions with individual equipment
Care for and use, effectively solve the problems, such as to cause fault electric arc to be failed to judge, judged by accident due to the use of reacance generator.
3rd, a kind of static reacance generator with lightning protection isolation with early warning of preventing fires of the present utility model, ground potential is struck back
Xegregating unit is integrated into the static reacance generator with isolation fire prevention warning function, makes integral device have ground potential anti-
Isolation features are hit, and do not influence the detection of fault electric arc, carry out fault electric arc Detection results during independently installed situation than each
It is good.
Brief description of the drawings
Fig. 1 is a kind of structural representation with lightning protection isolation with the static reacance generator for early warning of preventing fires of the present utility model
Figure；
Fig. 2 is a kind of main control MCU with lightning protection isolation with the static reacance generator for early warning of preventing fires of the present utility model
Control structure schematic diagram；
Fig. 3 is of the present utility model a kind of anti-with lightning protection isolation and the ground potential of the static reacance generator for early warning of preventing fires
Hit isolation module structural representation；
Fig. 4 is a kind of embodiment with lightning protection isolation with the static reacance generator for early warning of preventing fires of the present utility model
Two level SVG major loop structure figures；
Fig. 5 is a kind of embodiment with lightning protection isolation with the static reacance generator for early warning of preventing fires of the present utility model
Three level SVG major loop structure figures；
Fig. 6 is a kind of embodiment with lightning protection isolation with the static reacance generator for early warning of preventing fires of the present utility model
Split-phase H bridge structure SVG major loop structure figures；
Fig. 7 is of the present utility model a kind of with lightning protection isolation and the failure electricity in the static reacance generator for early warning of preventing fires
Arc detection method flow chart.
Embodiment
Embodiment provided by the utility model is described in detail below in conjunction with accompanying drawing.
As shown in figure 1, a kind of static reacance generator with lightning protection isolation with early warning of preventing fires, is that one kind has ground potential concurrently
Counterattack isolation, fire prevention early warning, at the device of SVG compensation functions, including voltage sensor, current sensor, sample circuit, signal
Circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit, ground potential counterattack isolation module, IGBT is managed to drive
Dynamic circuit and SVG main circuits.
As shown in Fig. 2 described main control MCU connects voltage sensor and electric current by signal processing circuit with sample circuit
Sensor, main control MCU are also connected with arc fault warning circuit and IGBT drive circuit, and SVG master is connected by IGBT drive circuit
Circuit, main control MCU export IGBT trigger pulse by IGBT drive circuit, control in SVG main circuit real-Time Compensation power networks
Reactive current.
Main control MCU by same voltage and current sample signal respectively by fault electric arc analysis and reactive current calculate after,
Fault electric arc warning output and IGBT control outputs are carried out respectively；Enable devices to before fault electric arc characteristic current is compensated
It is sampled out, ensures the accurate detection of fault electric arc.
As shown in figure 3, the ground potential counterattack isolation module is made up of a lightning current frequency impedance device, it is installed in series
Thunder and lightning insulation blocking is formed between lightning proof ground and protecting field, Low ESR is presented under normal circumstances, ensures the normal safety of equipment
Ground connection；When lightning current is struck back from lightning protection ground terminal, under lightning current frequency, the element shows high impedance, isolates the anti-of thunder and lightning
Hit, force lightning current to be released to earth mat so that protection ground terminal exempts from back flashover harm, when lightning current is released completion
Afterwards, the lightning protection isolation element returns to low impedance state again.
Described lightning current frequency impedance device is a kind of reactor, and its core material can be FERRITE CORE such as MnZn system
Material, Ni-Zn series material, magnesium zinc system material etc. or alloy type magnetic core such as silicon (silicon) steel, ferrocart core, sendust, iron nickel
Alloy, molybdenum permalloy, amorphous, microcrystallizing alloy etc..Wire rod can be polyurethanes enamel-covered wire, polyester enamelled wire from adhesive aggregation
Carbamate enamel-covered wire, silk-covered wire, twisted wire, plating copper cash, three layer insulation wire, PVC lines etc..Its equivalent model is represented by managing
Think inductance series equivalent resistance parallel parasitic capacitance again, high resistant now is presented for the frequency range of lightning current energy-intensive to external characteristic table
Anti-, other frequency ranges show as Low ESR.Conducting state is shown as under normal circumstances, and impedance is low, ensures the normal peace of equipment
Full ground connection；When earthed system have lightning current by when, under lightning current frequency, the element is high impedance, blocks the counterattack of thunder and lightning,
So that lightning current can only be released to earth mat.After the completion of lightning current is released, ground potential counterattack isolation element returns to again
Low impedance state.
Described main control MCU also controls power supply while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of breaker, cut off the electricity supply during failure.
Described SVG major loops are electronic power convertor, including multigroup IGBT units, form two level or three level three
Phase voltage source type transverter topology, can also form split-phase H bridge structural topologies.
As shown in figure 4, to use two level three-phase voltage source type transverters topology in embodiment.Six groups are included in topology
IGBT units.
As shown in figure 5, to use three-level three-phase voltage source converter topology in embodiment.12 groups are included in topology
IGBT units.
As shown in fig. 6, to use split-phase H bridge structure three-phase voltage source types transverter topology in embodiment.Included in topology
Three groups of IGBT units.
Described main control MCU is single chip machine controlling circuit, is made up of singlechip chip and its peripheral circuit.
Described IGBT drive circuit is the IGBT drive circuit of prior art.
Described arc fault warning circuit includes buzzer and its drive circuit.
Described switching value spacing output circuit is made up of optocoupler.
A kind of control method with lightning protection isolation with the static reacance generator for early warning of preventing fires, comprises the following steps：
Step 1: system initialization, electricity on device；
Step 2: acquisition system three-phase voltage and three-phase current, and signal is delivered into signal modulation process circuit；
Step 3: signal modulation process circuit is modulated processing to voltage and current signal respectively, and will be modulated after
Signal deliver to main control MCU unit；
Step 4: main control MCU unit is calculated the reactive current numerical value of system by sample rate current, voltage parameter；It is meanwhile right
Current signal processing, extracts arc current characteristic value；
Step 5: reactive current of the main control MCU unit according to calculating, draws the compensation magnitude of current that SVG needs, generation triggering
Pulse, IGBT is controlled, reactive current in real-Time Compensation power network；
Meanwhile main control MCU unit carries out analysis judgement, such as according to by logical calculated to extraction arc current characteristic value
Meet fault electric arc signal, then send instruction to fault electric arc warning module, and cut off the electricity supply breaker by output signal, cut
Disconnected fault electric arc；As do not met, instruction, and return to step two are not sent.
As shown in fig. 7, a kind of detect with lightning protection isolation and the fault electric arc in the static reacance generator for early warning of preventing fires
Method, judged jointly using four kinds of conditions, and one of which decision condition by the use of current difference parameter result of determination as
Premise, fault electric arc is judged using relative harmonic content rate of change, effective detection can be out of order electricity in complex situations
Arc, comprise the following steps：
Step 1：Persistently electric current is sampled (according to actual hardware situation, each cycle adopts 64 or 128 points)；
Step 2：The sampled value of electric current is 128 each cycles or 64 each cycles.Exemplified by 64 points, current sampling data is remembered
For I0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(sampled value and normal value be perunit value).Calculate
The difference parameter of current sampling period electric current and normal cycle electric current：
By IperWith threshold value S1Compare, if Iper≤S1, then sampled current value width is given to normal cycle current value, renewal is normally
Periodic current value；If Iper＞ S1, then calculating is further analyzed to judge whether to be occurred by fault electric arc；
Step 3：The average value of calculating current：
Judge whether the positive-negative half-cycle of electric current is symmetrical with the average value of electric current.If IaveMore than given threshold value S2, then it is assumed that
Waveform symmetry is unsatisfactory for requiring, indicates parameter m1 assignment 1 for waveform symmetry, be otherwise m1 assignment 0；
Step 4：Calculate the difference of the two neighboring sampled value of sample rate current：
ΔIk=Ik+1-Ik(k=0,1,2 ... 62) (3)
With the maximum K of the differencev=max [Δ I0, Δ I1..., Δ I62] represent the maximum rate of change of electric current.If Kv
More than threshold value S3, then it is assumed that current changing rate is excessive, is current changing rate parameter m2 assignment 1, and otherwise m2 is entered as zero；
Step 5：The wave mode parameter of calculating current：
Wherein, α is configured according to actual current, typically takes normal current peak value.Can be with table with the wave mode parameter of electric current
Show whether electric current contains flat shoulder.If KpMore than threshold value S4, then it is assumed that electric current contains flat shoulder, and parameter m3 is indicated for flat shoulder
Assignment 1, otherwise m3 be entered as zero；
Step 6：Sample rate current harmonic wave is detected with FFT, sample rate current higher hamonic wave is calculated and (calculates the 3rd, 5,7,9 time herein
Harmonic wave) containing ratio rate of change Δ PnIf Δ PnMore than threshold value S4, then it is assumed that sample rate current harmonic content is abnormal, is indicated for harmonic wave
Parameter m4 is entered as 1, is otherwise entered as 0；
Step 7：Calculate the sum of four instruction parameters in 3~step 6 of above-mentioned steps, i.e. m=m1+m2+m3+m4；If m>=
2, fault electric arc cycle instruction parameter sum=sum+1, if sum>=6, then trigger alarm signal；If sum<6, then return to step
Rapid 2 continue to differentiate；If m<2, then it is assumed that there is no fault electric arc, be sum assignment 0, and normal current is updated to now
Sample rate current.
Step 6 comprises the following steps that：
Step 601. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave
Containing ratio is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M is sampling number, taken in this example 3,5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 602. is based on the 1st normal power frequency sampling period electric current odd harmonic containing ratio P that step 2 is judged
Value, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change Δ Pn, Δ Pn=Pn- P, double sampling week
The difference of electric current odd harmonic containing ratio is sampling period odd harmonic containing ratio rate of change Δ P between phasen。
A kind of static reacance generator with lightning protection isolation with early warning of preventing fires of the present utility model, by the electricity of fault electric arc
Stream detection and the current detecting part of reacance generator are shared, and using same detection signal, are enabled devices in failure electricity
Arc characteristic current is sampled out before being compensated, and ensures the accurate detection of fault electric arc.
A kind of static reacance generator and its control method with lightning protection isolation with early warning of preventing fires of the present utility model, profit
Same current data is handled with same main control MCU, calculates fault electric arc characteristic value and reactive current value respectively, it is right respectively
Fault electric arc warning circuit and SVG IGBT drive circuit are controlled, and are perfectly realized and are realized two kinds of work(with individual equipment
Use is taken into account while energy, effectively solves the problems, such as to cause fault electric arc to be failed to judge, judged by accident due to the use of reacance generator.
It is of the present utility model a kind of with lightning protection isolation and the arc-detection side in the static reacance generator for early warning of preventing fires
Method, by the use of the result of determination of current difference parameter as premise, fault electric arc is judged using relative harmonic content rate of change,
The interference of nonlinear load can be effectively excluded, while is judged using four kinds of judging means, can be in complex device situation
Accurately detect fault electric arc down.
It is of the present utility model it is a kind of with lightning protection isolation with prevent fires early warning static reacance generator, by ground potential counterattack every
From integration of equipments into the static reacance generator with isolation fire prevention warning function, make integral device that there is ground potential counterattack
Isolation features, and the detection of fault electric arc is not influenceed, than each, progress fault electric arc Detection results are good during independently installed situation.
Above example is implemented under premised on technical solutions of the utility model, gives detailed embodiment
With specific operating process, but the scope of protection of the utility model is not limited to the above embodiments.Side used in above-described embodiment
Method is conventional method unless otherwise instructed.
Claims (3)
1. a kind of static reacance generator isolated with lightning protection with early warning of preventing fires, it is that one kind has ground potential counterattack isolation concurrently, prevented
Fiery early warning, the device of SVG compensation functions, including voltage sensor, current sensor, sample circuit, signal processing circuit, master control
MCU, arc fault warning circuit, switching value spacing output circuit, ground potential counterattack isolation module, IGBT drive circuit and SVG
Main circuit；
Characterized in that, described main control MCU connects voltage sensor with sample circuit by signal processing circuit and electric current passes
Sensor, main control MCU are also connected with arc fault warning circuit and IGBT drive circuit, and the main electricity of SVG is connected by IGBT drive circuit
Road, main control MCU export IGBT trigger pulse by IGBT drive circuit, control the nothing in SVG main circuit real-Time Compensation power networks
Work(electric current；
Main control MCU respectively by fault electric arc analysis with after reactive current calculating, distinguishes same voltage and current sample signal
Carry out fault electric arc warning output and IGBT control outputs；Enable devices to be adopted before fault electric arc characteristic current is compensated
Sample comes out, and ensures the accurate detection of fault electric arc；
The ground potential counterattack isolation module is made up of a lightning current frequency impedance device, is installed in series in lightning proof ground and protecting field
Between formed thunder and lightning insulation blocking.
2. a kind of static reacance generator with lightning protection isolation with early warning of preventing fires according to claim 1, its feature exist
In described main control MCU also controls electric power disconnection while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of device, cut off the electricity supply during failure.
3. a kind of static reacance generator with lightning protection isolation with early warning of preventing fires according to claim 1, its feature exist
It is electronic power convertor in, described SVG major loops, including multigroup IGBT units form two level or three-level three-phase electricity
Potential source type transverter topology, can also form split-phase H bridge structural topologies.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720637867.7U CN206876803U (en) | 2017-06-02 | 2017-06-02 | A kind of static reacance generator with lightning protection isolation with early warning of preventing fires |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720637867.7U CN206876803U (en) | 2017-06-02 | 2017-06-02 | A kind of static reacance generator with lightning protection isolation with early warning of preventing fires |
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| CN206876803U true CN206876803U (en) | 2018-01-12 |
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ID=61338242
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111192429A (en) * | 2020-01-20 | 2020-05-22 | 天津合极电气科技有限公司 | Fire early warning detection method based on charge trajectory tracking technology |
| CN114094545A (en) * | 2021-11-24 | 2022-02-25 | 江苏莱提电气股份有限公司 | APF/SVG driving circuit fault rapid protection system and method |
-
2017
- 2017-06-02 CN CN201720637867.7U patent/CN206876803U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111192429A (en) * | 2020-01-20 | 2020-05-22 | 天津合极电气科技有限公司 | Fire early warning detection method based on charge trajectory tracking technology |
| CN114094545A (en) * | 2021-11-24 | 2022-02-25 | 江苏莱提电气股份有限公司 | APF/SVG driving circuit fault rapid protection system and method |
| CN114094545B (en) * | 2021-11-24 | 2024-04-09 | 江苏莱提电气股份有限公司 | APF/SVG driving loop fault rapid protection system and method |
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