CN109302049A - A kind of island power supply Multiple Protective Structure and its power supply protection method - Google Patents

A kind of island power supply Multiple Protective Structure and its power supply protection method Download PDF

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Publication number
CN109302049A
CN109302049A CN201810250843.5A CN201810250843A CN109302049A CN 109302049 A CN109302049 A CN 109302049A CN 201810250843 A CN201810250843 A CN 201810250843A CN 109302049 A CN109302049 A CN 109302049A
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CN
China
Prior art keywords
power supply
leakage current
island
leakage
magnet ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810250843.5A
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Chinese (zh)
Inventor
罗安
周乐明
陈燕东
戴瑜兴
伍文华
何志兴
徐千鸣
周小平
杨苓
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Hunan University
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Hunan University
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Publication date
Application filed by Hunan University filed Critical Hunan University
Priority to CN201810250843.5A priority Critical patent/CN109302049A/en
Publication of CN109302049A publication Critical patent/CN109302049A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00Details of emergency protective circuit arrangements
    • H02H1/0007Details of emergency protective circuit arrangements concerning the detecting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20909Forced ventilation, e.g. on heat dissipaters coupled to components
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0009Devices or circuits for detecting current in a converter

Abstract

The invention discloses a kind of island power supply Multiple Protective Structure island power supply Multiple Protective Structure and its power supply protection methods, including modularization totally-enclosed " three proofings " structure-design technique, liquid uniform heat conduction and forced convertion Compound cooling technology and highly sensitive adaptive magnetic to modulate electric leakage protection technology.In terms of three proofings: Ordnance Protection grade is increased to IP54 or more by modularization totally-enclosed " three proofings " structure-design technique.Heat dissipation aspect: liquid uniform heat conduction and forced convertion Compound cooling technology realize high-power special power supply in effective heat dissipation of hot environment.In terms of earth leakage protective: highly sensitive adaptive magnetic modulation electric leakage protection technology can accurately detect DC leakage current, have the function of mA grades of residual current protections.The highly reliable means of defence of island special power supply invented; solve the problems, such as that heat dissipation is mutually restricted with " three proofings "; Sensitive Detection and protection can be carried out to DC leakage current, realize special power supply disposition and its operation reliably and with long-term under the harsh environment of island.

Description

A kind of island power supply Multiple Protective Structure and its power supply protection method
Technical field
The present invention relates to island, bank base and ships etc. under harsh environment for electrical domain, and especially a kind of island power supply is multiple Safeguard structure and its power supply protection method.
Background technique
Island is located in national defence outpost, is the weight of the important barrier safeguarded national security and China's the Belt and Road strategy Want carrier.13 planning of " made in China 2025 ", country is explicitly pointed out key breakthrough island spatial synthesis energy supply network Pinch technology.Leading form one of of the island power supply as ocean future energy supply network is the weight on island, harbour and harbour exploitation It ensures, it is significant to make ocean power to China.
Island power-supply system is served in severe marine climate environment, and average annual humidity is up to 85%, and summer surface temperature is high Up to 60 DEG C, day and night temperature is big, and high salt fog, high humility, high temperature difference are run reliably and with long-term to power source equipment brings huge challenge: outdoor Water logging leads to plant capacity tube short circuit aircraft bombing, and high salt fog causes circuit board to be corroded to cause aircraft bombing damage, and excess temperature causes equipment fast Fast aging and Frequent Troubles.There are mainly three types of forms for common power supply heat sinking: natural cooling, air blast cooling, water are cooling.It considers Due to being influenced by factors such as volume, cost, reliabilities, the mode of air blast cooling is mostly used to be handled at present, but this gesture Must power source internal bring dust, salt fog etc. interfere.Heat dissipation and waterproof, salt spray proof, it is dust-proof the problems such as mutually restrict, it is equal both at home and abroad The problem is not yet thoroughly solved, the significant technology issues for breaking through special power supply adaptability under harsh environment are needed.
Meanwhile as island national defence and the specific gravity of civilian installation DC load are more and more big, it is desirable that island power supply is to direct current Leakage current also has defencive function.Conventional AC type earth leakage circuit-breaker uses electromagnetic induction principle, passes through inlet wire and outlet Alternating current is inconsistent to be formed by induced electromotive force to determine whether there are leakage current, can detect ac leakage stream, but as master There is DC leakage current in circuit, will cause the preparatory magnetization of magnet ring iron core, causes detection device drop-away value to deviate, into magnetic saturation Area, detects misalignment, and cisco unity malfunction brings huge security risk.And the application scenarios of the load of special type containing direct current are to island Source-drain protection requires high.For this purpose, Type B earth leakage circuit-breaker is proposed to detect the DC leakage under the scene Stream, by additionally introducing the driving source of size variation on magnet ring, so that magnet ring is alternately saturated, when DC leakage occurs in major loop Stream can detect the size of DC leakage current by identification output signal to determine whether there are rain supply, realize DC leakage current Protection.However, Type B earth leakage circuit-breaker is expensive, price is 150 times of AC type earth leakage circuit-breaker, is seriously restrict The construction and development in China island power supply field.Meanwhile conventional Hall and magneto-resistive transducing applied to Type B residual current protection switch The magnetic field strength detection range of technology is narrow, the leakage current of wide scope, polymorphic type is difficult to accurately detect, this will seriously jeopardize sea The safe handling of island special type load, brings huge security risk, it would be highly desirable to solve.
Summary of the invention
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of island power supply multiple-protection Structure and its power supply protection method solve power supply highly reliable powerup issue in island under harsh environment, realize sensitive DC leakage current Detection and protection, improve island power environment adaptability.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: a kind of island power supply Multiple Protective Structure, Including outer casing of power supply;Power supply inner casing, and the power supply inner shell left and right sides, bottom and the power supply are set in the outer casing of power supply Power supply inner cavity air duct is formed between shell;The multiple power module units of setting, each power module in the power supply inner casing The bottom of unit is provided with cooling fin;Gap is equipped between two adjacent power module units, and at left and right sides of the gap Power supply inner casing on be provided with radiator fan;The outer casing of power supply top setting power supply air inlet and power supply air outlet;It is described Four vertex of outer casing of power supply are provided with folding aerofoil;It is provided with and exchanges between power supply inner casing top and the outer casing of power supply Earth leakage circuit-breaker and DC leakage protective switch.
The power module unit is designed using totally-enclosed structure and aviation socket;The power supply air inlet and power supply outlet air It is mounted on Air Filter and shutter at mouthful, effectively prevent the intrusion and corrosion of water, salt fog, bulky grain dust.
The cooling fin is using liquid uniform heat conduction and three face radiator structures (i.e. bottom surface, left side, right side are radiated), benefit The even heat that power module generates is conducted to fin surface with liquid thermal convection;Power supply inner cavity air duct, power supply into Air port, power supply air outlet, folding aerofoil and interstitial radiator fan will form the heat dissipation path of a plurality of forced convertion;Wherein, institute Stating liquid is pure water.Island power supply Multiple Protective Structure
The ac leakage protective switch and DC leakage protective switch include magnet ring probe, adaptive square wave excitation Source, isolated power supply module, leakage current test and control unit, leakage current judging unit, executing agency and relay;It is described every It is connected from power module with the adaptive square wave excitation source, the isolation electricity of the isolated power supply module offer+5V, -5V and GND Source;Input terminal of the adaptive square wave excitation source as magnet ring probe;The leakage current test unit and control unit conduct The output end of magnet ring probe;The leakage current test unit and control unit, leakage current judging unit, executing agency, relay It is sequentially connected.
Correspondingly, the present invention also provides a kind of power supply protection method of above-mentioned island power supply Multiple Protective Structure, the party Method is main the realization process includes: adaptive square wave excitation source block is motivated input voltage signal uinIt is superimposed to magnet ring probe On induction coil, so that the magnetic field of magnet ring probe is alternately saturated;Once magnet ring probe magnetic saturation, the impedance of induction coil tend to 0, Sensed current signal is then exported since existing driving source will increased dramatically, at this point, leakage current test and control unit will at once The drive level of automatic turning driving source;As the electric current i of major loop DC+ and DC-L1And iL2It is equal, i.e., not there is leakage current, The waveform for exporting sensed current signal is that low and high level is symmetrical;As the electric current i of major loop DC+ and DC-L1And iL2It is unequal, i.e., There are when leakage current, inductive coil is by the induced electromotive force of lasting superposition certain orientation, so that under the induced electromotive force direction Magnet ring probe enters magnetic saturation in advance, causes output signal low and high level asymmetric;Once leakage current judging unit recognizes defeated The asymmetric phenomenon of sensed current signal out, executing agency will provide cut-off signals J, so that relay acts at once, shutdown master The route of circuit DC+ and DC-.
Compared with prior art, the advantageous effect of present invention is that: it is tight on island that the present invention is able to achieve special power supply Operation reliably and with long-term under cruel environment.Configuration aspects: modularization totally-enclosed " three proofings " structure-design technique is used, can be effectively prevent Ordnance Protection grade is increased to IP54 or more by the intrusion and corrosion of water, salt fog, bulky grain dust;Heat dissipation aspect: liquid is proposed There is the phenomenon that thermal accumlation and temperature exceeding standard in body uniform heat conduction and forced convertion Compound cooling technology, avoidable interior of the cabinet, High-power special power supply is realized in effective heat dissipation of hot environment, solves the problems, such as that heat dissipation is mutually restricted with " three proofings ";Leakage In terms of electric protection: proposing highly sensitive adaptive magnetic modulation electric leakage protection technology, it is straight can accurately to detect wide scope, the friendship of polymorphic type Leakage current is flowed, has the function of mA grades of residual current protections.
Detailed description of the invention
Fig. 1 is one embodiment of the invention island power supply multiple-protection and highly reliable power supply cabinet body structural schematic diagram;
Fig. 2 is the totally-enclosed of one embodiment of the invention power module unit " three proofings " structural schematic diagram;
Fig. 3 is one embodiment of the invention power module cooling fin " heat dissipation of three faces " and " liquid uniform heat conduction " structural representation Figure;
Fig. 4 is that the highly sensitive adaptive magnetic of one embodiment of the invention modulates electric leakage protection technology block diagram;
Fig. 5 is excitation input voltage waveform and output detection current wave of the one embodiment of the invention without DC leakage current Shape;
Fig. 6 is excitation input voltage waveform of the one embodiment of the invention containing DC leakage current and output detection current waveform.
Specific embodiment
One embodiment of the invention island power supply multiple-protection and highly reliable power supply cabinet body structure are as shown in Figure 1, the cabinet body Design mainly includes: (1) outer casing of power supply, (2) power supply inner cavity air duct, (3) power supply inner casing, (4) power module unit, (5) power supply Module heat dissipating piece, (6) ac leakage protective switch, (7) DC leakage protective switch, (8) power supply air inlet, (9) power supply outlet air Mouth, (10) module heat dissipating fan, (11) folding aerofoil etc., above-mentioned component, which is sequentially connected, constitutes power supply cabinet body.In structure, the power supply Inner cavity air duct is located among outer casing of power supply and power supply inner casing, and the power supply air outlet and power supply air inlet are located at outer casing of power supply The left and right sides at top;The power module unit is located in power supply inner casing, and the power module cooling fin is located at power module The bottom of unit, the module heat dissipating fan are located at the left and right sides of any two power modules cell gap, convenient for conducting the electricity The heat of source module cooling fin;The folding aerofoil is located at four apex angles of outer casing of power supply, and angled with outer casing of power supply, just Flowing in power supply inner cavity air duct.Above-mentioned special Duct design will form the heat dissipation path of a plurality of forced convertion, be in from dextrad Left semicircular.Meanwhile the power supply air inlet and air outlet install Air Filter and shutter additional, the power module unit uses Totally-enclosed structure can effectively prevent the intrusion and corrosion of water, salt fog, bulky grain dust.The power module unit nominal loss Generated heat is discharged by designed cooling fin and special air duct, realizes high-power special power supply in high temperature ring Effective heat dissipation in border solves the problems, such as that heat dissipation is mutually restricted with " three proofings ".
One embodiment of the invention power module unit totally-enclosed " three proofings " structure is as shown in Fig. 2, the power module unit Using multilayer salt spray proof paint guard technology, coating system design are as follows: among spraying rich zinc anti-rust paint priming paint 1-spraying epoxy 1-spraying salt spray proof epoxy finish 1 is painted, all coating spraying thickness of dry film are 80-120 μm.Meanwhile the power module Unit uses totally-enclosed structure, realizes electric energy for giving the communication between modular unit, the structure by the aviation socket of its backboard It is effectively prevent the intrusion of water, bulky grain dust, in conjunction with the design of Fig. 1 power supply cabinet body, entire Ordnance Protection grade is increased to IP54 More than.
One embodiment of the invention power module cooling fin " heat dissipation of three faces " and " liquid uniform heat conduction " structure as shown in figure 3, The power module cooling fin is the design of three faces, is close to the cabinet surface of the power module unit, heat dissipation area is big;The electricity Source module cooling fin bottom is embedded in heat-conductive thermo tube, and the present invention utilizes the liquid thermal convection of heat pipe in cooling fin by power module unit The even heat of generation is conducted to three surfaces of cooling fin;In combination with special Duct design and strong convection designed by Fig. 1 Technology guarantees that heat can quickly shed from cabinet body ventilation hole, interior of the cabinet is avoided the phenomenon that thermal accumlation and temperature exceeding standard occur.
The highly sensitive adaptive magnetic modulation electric leakage protection technology of one embodiment of the invention is as shown in figure 4, the ac leakage is protected Shield switch and DC leakage protective switch are respectively positioned on the top of island power supply cabinet body, and the two includes magnet ring probe, adaptive square wave Driving source, isolated power supply module, leakage current test and control unit, leakage current judging unit, executing agency and relay etc. Component, for realizing the alternating current-direct current earth leakage protective under the complex working condition of island.Wherein, the isolated power supply module and described adaptive Square wave excitation source is connected, the former provides the isolated power supply of+5V, -5V and GND for the latter;The adaptive square wave excitation source conduct The input terminal of magnet ring probe;The leakage current test and output end of the control unit as magnet ring probe, and be adaptive square wave Driving source provides drive level energizing signal;The leakage current test and control unit and leakage current judging unit, executing agency, Relay is sequentially connected.Implement step are as follows:
(1) adaptive square wave excitation source block is motivated input voltage signal uinIt is superimposed to the induction coil of magnet ring probe On, so that the magnetic field of magnet ring probe is alternately saturated;
(2) once magnet ring probe magnetic saturation, the impedance of induction coil tend to 0, then sensed current signal is exported due to existing Driving source will increased dramatically, at this point, leakage current test and control unit are by the drive level of automatic turning driving source at once;
(3) as the electric current i of major loop DC+ and DC-L1And iL2It is equal, i.e., not there is leakage current, output detection electric current letter Number waveform should be that low and high level is symmetrical;
(4) work as the electric current i of major loop DC+ and DC-L1And iL2It is unequal, that is, when there is leakage current, even mA grades, sense Property coil also by the induced electromotive force of lasting superposition certain orientation so that magnet ring probe under the induced electromotive force direction in advance into Enter magnetic saturation, causes output signal low and high level asymmetric.
(5) once leakage current judging unit recognizes the output asymmetric phenomenon of sensed current signal, executing agency will be given Cut-off signals J out turns off the route of major loop DC+ and DC- so that relay will act at once.
Fig. 5 is excitation input voltage waveform and output detection current wave of the one embodiment of the invention without DC leakage current Shape.When there is no leakage current, excitation input voltage waveform and the low and high level of output detection current waveform are symmetrical.
Fig. 6 is excitation input voltage waveform of the one embodiment of the invention containing DC leakage current and output detection current waveform. When there are leakage current, excitation input voltage waveform and the low and high level of output detection current waveform are obviously asymmetric.

Claims (5)

1. a kind of island power supply Multiple Protective Structure, which is characterized in that including outer casing of power supply (1);It is set in the outer casing of power supply (1) It sets power supply inner casing (3), and forms power supply inner cavity between the power supply inner casing (3) left and right sides, bottom and the outer casing of power supply (1) Air duct (2);The multiple power module units (4) of setting, the bottom of each power module unit (4) in the power supply inner casing (3) Portion is provided with cooling fin (5);Gap is equipped between two adjacent power module units (4), and at left and right sides of the gap Radiator fan (10) are provided on power supply inner casing (3);Outer casing of power supply (1) top setting power supply air inlet (8) and power supply Air outlet (9);(1) four vertex of the outer casing of power supply is provided with folding aerofoil (11);Power supply inner casing (3) top and institute It states and is provided with ac leakage protective switch (6) and DC leakage protective switch (7) between outer casing of power supply (1).
2. power supply Multiple Protective Structure in island according to claim 1, which is characterized in that the power module unit (4) It is designed using totally-enclosed structure and aviation socket;Air Filter is mounted at the power supply air inlet (8) and power supply air outlet (9) With shutter, it effectively prevent the intrusion and corrosion of water, salt fog, bulky grain dust.
3. power supply Multiple Protective Structure in island according to claim 1, which is characterized in that the cooling fin (5) uses liquid Body uniform heat conduction and three face radiator structures, are conducted the even heat that power module generates to cooling fin table using liquid thermal convection Face;Power supply inner cavity air duct (2), power supply air inlet (8), power supply air outlet (9), folding aerofoil (11) and interstitial radiation air Fan the heat dissipation path that (10) form a plurality of forced convertion;Wherein, the liquid is pure water.
4. power supply Multiple Protective Structure in island according to claim 1, which is characterized in that the ac leakage protective switch It include magnet ring probe, adaptive square wave excitation source, isolated power supply module, leakage current test and control with DC leakage protective switch Unit, leakage current judging unit, executing agency and relay processed;The isolated power supply module and the adaptive square wave excitation Source is connected, the isolated power supply of the isolated power supply module offer+5V, -5V and GND;The adaptive square wave excitation source is as magnetic The input terminal of ring probe;The leakage current test unit and output end of the control unit as magnet ring probe;The leakage current inspection Unit is surveyed to be sequentially connected with control unit, leakage current judging unit, executing agency, relay.
5. the power supply protection method of island power supply Multiple Protective Structure described in a kind of claim 4, which is characterized in that this method master It wants the realization process includes: adaptive square wave excitation source block is motivated input voltage signal uinIt is superimposed to the induction of magnet ring probe On coil, so that the magnetic field of magnet ring probe is alternately saturated;Once magnet ring probe magnetic saturation, the impedance of induction coil tend to 0, then defeated Sensed current signal will be increased dramatically due to existing driving source out, at this point, leakage current test and control unit will be automatic at once Overturn the drive level of driving source;As the electric current i of major loop DC+ and DC-L1And iL2It is equal, i.e., not there is leakage current, exports The waveform of sensed current signal is that low and high level is symmetrical;As the electric current i of major loop DC+ and DC-L1And iL2It is unequal, that is, exist When leakage current, inductive coil is by the induced electromotive force of lasting superposition certain orientation, so that the magnet ring under the induced electromotive force direction Probe enters magnetic saturation in advance, causes output signal low and high level asymmetric;Once leakage current judging unit recognizes output inspection The asymmetric phenomenon of current signal is surveyed, executing agency will provide cut-off signals J, so that relay acts at once, turn off major loop The route of DC+ and DC-.
CN201810250843.5A 2018-03-26 2018-03-26 A kind of island power supply Multiple Protective Structure and its power supply protection method Pending CN109302049A (en)

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CN201810250843.5A CN109302049A (en) 2018-03-26 2018-03-26 A kind of island power supply Multiple Protective Structure and its power supply protection method

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Application Number Priority Date Filing Date Title
CN201810250843.5A CN109302049A (en) 2018-03-26 2018-03-26 A kind of island power supply Multiple Protective Structure and its power supply protection method

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Cited By (1)

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Application publication date: 20190201