CN107359587A - The non-reliability earthed system self-adaption route selection leakage protection system of three-phase and method - Google Patents

The non-reliability earthed system self-adaption route selection leakage protection system of three-phase and method Download PDF

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Publication number
CN107359587A
CN107359587A CN201710659186.5A CN201710659186A CN107359587A CN 107359587 A CN107359587 A CN 107359587A CN 201710659186 A CN201710659186 A CN 201710659186A CN 107359587 A CN107359587 A CN 107359587A
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phase
circuit
earth leakage
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CN107359587B (en
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秦海鹏
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Ningbo Deqiao Electronic Technology Co., Ltd
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Jiangsu Normal University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006—Calibration or setting of parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors

Abstract

The present invention relates to a kind of non-reliability earthed system self-adaption route selection leakage protection system of three-phase and method; on the basis of the residual current protective unit detected based on power direction; add self-adaptive features collecting unit; when electric network composition changes; electric leakage characteristic parameter is captured by self-adaptive features collecting unit and adjustment circuit parameter is to adapt to the residual current protective unit; solve when network system structure changes, the problem of failure based on the earth leakage protective that power direction detects.

Description

The non-reliability earthed system self-adaption route selection leakage protection system of three-phase and method
Technical field
The present invention relates to earth leakage protective field, more particularly to a kind of non-reliability earthed system self-adaption route selection electric leakage of three-phase Protect system and method.
Background technology
The non-reliable ground system of three-phase is used for industrial and mining enterprises, and these units are high to electricity consumption reliability requirement, and it is general this The production overall situation of a little enterprises is complicated, and more or less presence is inflammable, explosion hazard gases or various dust are, it is necessary to there may be put Electric spark or the leak current fault of critical human life safety use necessary safety measure, should be timely once leak current fault occurs Fault branch is cut off, does not make failure propagation.The electrical leakage detecting method that the non-reliable ground system of three-phase uses at present has：Additional direct current Method, residual voltage method, zero sequence power direction method etc..Wherein, if realizing earth leakage protective by detecting residual voltage size, act Resistance value is unstable.Act selective, but act if realizing earth leakage protective by detecting zero-sequence current size, during single-phase earth leakage Resistance value is unstable, especially when grid branch is less, is also easy to produce malfunction；If judge to leak electricity by zero sequence power direction information Fault branch, then after carrying out secondary judgement by branch road zero-sequence current threshold value of leaking electricity, leak current fault branch road can be judged exactly, Therefore in practice, zero sequence power direction method is advantageously.Zero sequence power direction method combines zero-sequence voltage protection, zero-sequence current Protection and the principle of zero-sequence current direction protection, power supply system is not judged merely with the amplitude size of residual voltage and zero-sequence current Electric leakage whether occurs in system and which bar branch road leaks electricity, while also uses the phase of each branch road residual voltage and zero-sequence current Relation judges branch road, has so reached good selective purpose, and and can well prevent mistake using triple judgements Action.
With the development of microcontroller technology, currently there is some protection control circuits based on microcontroller, but work The production environment of ore deposit enterprise is miscellaneous, live power network insulation against ground resistance, distribution capacity etc. electronic component Parameters variation it is larger, These earth leakage protective device effects based on microcontroller are simultaneously unstable.Especially in the presence of compensation inductance or electric capacity three-phase it is non-can By in earthed system, once electric network composition changes in network system, there is situations such as back-off, undercompensation, then based on micro- Controller technology, power direction detection leakage protection system will fail.
The content of the invention
It is an object of the invention to provide a kind of non-reliability earthed system self-adaption route selection leakage protection system of three-phase and Method, solve when network system structure changes, the problem of failure based on the earth leakage protective that power direction detects.
In order to solve the above problems, the invention provides a kind of non-reliability earthed system self-adaption route selection electric leakage of three-phase to protect Protecting system, including the residual current protective unit detected based on power direction, in addition to self-adaptive features collecting unit, it is described adaptive Collection apparatus unit is used for leakage analog, to capture electric leakage feature, and passes through adjustment circuit parameter adaptation residual current protective unit, institute Stating self-adaptive features collecting unit includes：Collection apparatus primary circuit and control unit, wherein, the collection apparatus primary circuit bag Include two single-phase earth leakage analog circuits for connecting not isopen；The control unit includes receiving and handles gathered data and adjust electricity The master controller of road parameter, two hysteresis loop comparator, precision rectifer and the LPFs for corresponding to single-phase earth leakage analog circuit Device.
Further, the collection apparatus primary circuit includes two single-phase earth leakage analog circuits, i.e. the first single-phase earth leakage Analog circuit and the second single-phase earth leakage analog circuit, the first single-phase earth leakage analog circuit include resistance R in parallel1And electric capacity C1, and it is configured with the switch S of control circuit break-make1, the first single-phase earth leakage analog circuit one end ground connection；Described second is single-phase Leakage analog circuit includes resistance R in parallel2With electric capacity C2, and it is configured with the switch S of control circuit break-make2, described second is single-phase Leakage analog circuit on one side is grounded；Wherein, S is switched1And S2Opening and closing are controlled by control unit.
Further, the resistance R1=20K, the electric capacity C1=1nF, the resistance R2Value is in resistance R1Three / between half, the electric capacity C2Value is in electric capacity C11/3rd and half between.
Further, the master controller includes capture input module, phase shifting control module, A/D modular converters, man-machine Interface, communication interface and experiment sampling control module, wherein the capture input module is connected by hysteresis loop comparator respectively Single-phase earth leakage analog circuit, for depositing the circuit parameter received；The phase shifting control module is used for adjustment phase place, the people Machine interface is used to connect a terminal operating system, convenient to pass through main controller controls collection apparatus primary circuit.
The application further relates to a kind of non-reliability earthed system self-adaption route selection earth leakage protecting method of three-phase, based on power On the basis of the residual current protective unit of angle detecting, self-adaptive features collecting unit is added, when electric network composition changes, Electric leakage characteristic parameter is captured by self-adaptive features collecting unit and adjustment circuit parameter is to adapt to the residual current protective unit；Institute State residual voltage phase and zero-sequence current phase before self-adaptive features collecting unit obtains phase shift by simulating leak current fault Parameter, phase-shift circuit parameter is then adjusted, makes the residual voltage after phase shift and the same phase of zero-sequence current, to the zero-sequence current before phase shift Vector sum, and the spy using the electric signal after gained vector sum progress precision rectifer as route selection are asked with the residual voltage after phase shift Value indicative.
Further, the self-adaptive features collecting unit includes collection apparatus primary circuit, control unit and terminal behaviour Make system.The collection apparatus primary circuit includes the first single-phase earth leakage analog circuit and the second single-phase earth leakage analog circuit, institute Stating the first single-phase earth leakage analog circuit includes resistance R in parallel1With electric capacity C1, and it is configured with the switch S of control circuit break-make1, institute State first single-phase earth leakage analog circuit one end ground connection；The second single-phase earth leakage analog circuit includes resistance R in parallel2And electric capacity C2, and it is configured with the switch S of control circuit break-make2, the second single-phase earth leakage analog circuit one end ground connection；Wherein, S is switched1With S2Opening and closing are controlled by control unit.The control unit include receive and processing gathered data and adjustment circuit parameter master controller, Hysteresis loop comparator, precision rectifer and the low pass filter of two corresponding single-phase earth leakage analog circuits, wherein, the main control Device include two be used for deposit receive circuit parameter capture input modules, the phase shifting control module for adjustment phase place, A/D modular converters, man-machine interface, communication interface and experiment sampling control module, wherein capture input module is caught including first Input module and the second capture input module are obtained, is respectively used to deposit residual voltage and zero-sequence current.The terminal operating system The man-machine interface connection master controller is connected through, and passes through main controller controls collection apparatus primary circuit, the terminal Operating system is provided with the electric leakage parameter that the residual current protective unit is obtained by collection apparatus primary circuit and control unit The flow of operation.
Further, when being tested self-adaptive features collecting unit to obtain electric leakage characteristic parameter, terminal behaviour The operating process for making system comprises the following steps：
1) electric leakage signal collection or experimental order are inputted；
2) the switch S in the first single-phase earth leakage analog circuit is controlled1Closure；
3) residual voltage A is captured1Value is stored in the first capture input module, if time-out will move out, terminal operating system User trial failure is prompted, checks circuit, if it is successful, preparing capture zero-sequence current B1；
4) zero-sequence current B is captured1Value is stored in the second capture input module, if time-out will move out, terminal operating system User trial failure is prompted, checks circuit；
5) residual voltage A is calculated1With zero-sequence current B1Phase difference ψ1；
6) phase-shift circuit parameter is adjusted, the residual voltage after phase shift is moved and zero-sequence current B1Same phase, after gathering phase shift Residual voltage；
7) the A/D modular converters of master controller are started to the zero-sequence current B before phase shift1With the residual voltage after phase shift to Amount and SaCarry out 64 conversions；
8) leak(age) test switch S is cut off1；
9) digital filtering processing is carried out to the sampled value of gained in step 7, and calculates arithmetic mean of instantaneous value E1；
10) E is stored1With phasor difference ψ1Information；
11) the switch S in the second single-phase earth leakage analog circuit is controlled2Closure；
12) residual voltage A is captured2Value is stored in the first capture input module, if time-out will move out, prompts user trial Failure, check circuit；If it is successful, prepare capture zero-sequence current B2；
13) zero-sequence current B is captured2Value is stored in the second capture input module, if time-out will move out, prompts user trial Failure, check circuit；
14) capture A is calculated2With B2Phase difference ψ2；
15) phase-shift circuit parameter is adjusted, makes the residual voltage shifting after phase shift and zero-sequence current in the second leakage analog circuit Same phase, gather the residual voltage after phase shift；
16) the A/D modular converters of master controller are started to the residual voltage after phase shift in the second leakage analog circuit and shifting The zero-sequence current B of phase front2Vector sum SbCarry out 64 conversions；
17) leak(age) test switch S is cut off2；
18) digital filtering processing is carried out to the sampled value of gained in step 15, and calculates arithmetic mean of instantaneous value E2；
If 19) 0.85 ψ1<ψ2<1.1ψ1,E2>0.9E1Then think adaptive success；
20) the adaptive success of display.
Compared with prior art, there is following technique effect in the present invention：
The present invention provides a kind of non-reliability earthed system self-adaption route selection leakage protection system of three-phase, when electric network composition is sent out During raw change, self-adaptive features collecting unit capture electric leakage characteristic value, so as to adapt to residual current protective unit, earth leakage protective is avoided There is overcompensation or under-compensated situation in unit.
The present invention also provides a kind of three-phase non-reliability earthed system self-adaption route selection earth leakage protecting method, passes through artificial mould Intend leak current fault capture electric leakage characteristic value, so as to realize the accurate route selection of residual current protective unit.
Brief description of the drawings
Fig. 1 is the collection apparatus primary circuit figure of the present invention；
Fig. 2 is the electric leakage signal handling principle block diagram of the adaptive collecting unit of the present invention；
Fig. 3 is the algorithm pattern of the adaptive collecting unit experiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, lift a specific embodiment and described in detail.
As depicted in figs. 1 and 2, the invention provides a kind of non-reliability earthed system self-adaption route selection earth leakage protective of three-phase System, including (residual current protective unit is existing mature technology to the residual current protective unit detected based on power direction, therefore is not gone to live in the household of one's in-laws on getting married herein State) and self-adaptive features collecting unit.
Self-adaptive features collecting unit is used for leakage analog, to capture electric leakage feature, and passes through adjustment circuit parameter adaptation Residual current protective unit, so that it is guaranteed that the accurate route selection of residual current protective unit.Self-adaptive features collecting unit includes collection apparatus once Circuit, control unit and PC.As Fig. 1 be characterized collection primary circuit circuit diagram, collection apparatus primary circuit be used for simulate leak Electric fault, to capture the basic parameters such as residual voltage phase, zero-sequence current phase.Collection apparatus primary circuit includes being connected to not The the first single-phase earth leakage analog circuit and the second single-phase earth leakage analog circuit of isopen.First single-phase earth leakage analog circuit is included simultaneously The resistance R of connection1With electric capacity C1, and it is configured with the switch S of control circuit break-make1, first single-phase earth leakage analog circuit one end ground connection； Second single-phase earth leakage analog circuit includes resistance R in parallel2With electric capacity C2, and it is configured with the switch S of control circuit break-make2, second Single-phase earth leakage analog circuit one end is grounded.The value of resistance and electric capacity and the tolerable single-phase Leaked Current of Line to Ground resistance value of industry spot Relevant, the application selects C1=20K, C1=1nF, resistance R2Value is in resistance R1Three/with between half, it is described Electric capacity C2Value is in electric capacity C11/3rd and half between.
Control unit include master controller, the hysteresis loop comparator of two corresponding single-phase earth leakage analog circuits, precision rectifer with And low pass filter, wherein, master controller can realize controlling feature collection primary circuit, receive gathered data, processing data with And adjustment circuit parameter, connection PC, controlling switch S2With switch S2, the function such as communication, including storage gathered data first catches Obtain input module and the second capture input module, the phase shifting control module of adjustment phase place, A/D modular converters, man-machine interface, communication Interface and experiment sampling control module.Wherein, man-machine interface is used to connect PC, is easy to manual control collection apparatus once electric Road；Capture input module has two, for receiving the collection signal of primary circuit；First capture input module is used to catch zero sequence Voltage, the second capture input module are used to capture zero-sequence current.
PC connects master controller and passes through main controller controls collection apparatus primary circuit.PC, which is provided with, passes through feature Primary circuit and control unit are gathered to obtain the operating process of the electric leakage parameter of the residual current protective unit.
When electric network composition changes, self-adaptive features collecting unit capture electric leakage characteristic parameter, self-adaptive features are adopted The operation principle for collecting unit is as shown in Figure 2.Closure switch S1Or switch S2, gather residual voltage and carry out digital filtering and put Big processing, is then deposited in the first capture input module through a hysteresis loop comparator；Zero-sequence current is gathered again and carries out numeral Filtering and enhanced processing, are then deposited in the second capture input module through another hysteresis loop comparator；According to the zero sequence of collection Its phase difference can be calculated in voltage and zero-sequence current, and the scope of controllable phase shift is judged according to the phase difference, and passes through main control The phase shifting control module of device carries out phase shift so that the same phase of residual voltage and zero-sequence current after phase shift；To the electric current before phase shift and Voltage after phase shift seeks vector sum, carries out precision rectifer and low pass filter processing successively to gained vector sum, then passes through The A/D modular converters of master controller carry out 64 conversions.
The non-reliability earthed system self-adaption route selection leakage protection system of three-phase provided by the invention, when electric network composition occurs During change, self-adaptive features collecting unit capture electric leakage characteristic value, so as to adapt to residual current protective unit, earth leakage protective list is avoided There is overcompensation or under-compensated situation in member.
Present invention also provides a kind of non-reliability earthed system self-adaption route selection earth leakage protecting method of three-phase, its department of physics System is based on the above-mentioned non-reliability earthed system self-adaption route selection leakage protection system of three-phase.This method is based on power side To on the basis of the residual current protective unit of detection, self-adaptive features collecting unit is added, when electric network composition changes, is led to Cross self-adaptive features collecting unit capture electric leakage characteristic parameter and adjustment circuit parameter is to adapt to residual current protective unit.It is adaptive special The parameter that collecting unit obtains residual voltage phase and zero-sequence current phase before phase shift according to simulation leak current fault is levied, is then adjusted Whole phase-shift circuit parameter, make the residual voltage after phase shift equal with zero-sequence current, after the zero-sequence current before phase shift and phase shift Residual voltage asks vector sum, and the characteristic value using the electric signal after gained vector sum progress precision rectifer as route selection, entirely Electric leakage signal is gathered or experiment process is operated via PC and completed, as shown in figure 3, specific operating procedure is as follows：
1) electric leakage signal collection or experimental order are inputted；
2) the switch S in the first single-phase earth leakage analog circuit is controlled1Closure；
3) residual voltage A is captured1Value is stored in the first capture input module, if time-out will move out, terminal operating system User trial failure is prompted, checks circuit, if it is successful, preparing capture zero-sequence current B1；
4) zero-sequence current B is captured1Value is stored in the second capture input module, if time-out will move out, terminal operating system User trial failure is prompted, checks circuit；
5) residual voltage A is calculated1With zero-sequence current B1Phase difference ψ1；
6) phase-shift circuit parameter is adjusted, the residual voltage after phase shift is moved and zero-sequence current B1Same phase, after gathering phase shift Residual voltage；
7) the A/D modular converters of master controller are started to the zero-sequence current B before phase shift1With the residual voltage after phase shift to Amount and SaCarry out 64 conversions；
8) leak(age) test switch S is cut off1；
9) digital filtering processing is carried out to the sampled value of gained in step 7, and calculates arithmetic mean of instantaneous value E1；
10) E is stored1With phasor difference ψ1Information；
11) the switch S in the second single-phase earth leakage analog circuit is controlled2Closure；
12) residual voltage A is captured2Value is stored in the first capture input module, if time-out will move out, prompts user trial Failure, check circuit；If it is successful, prepare capture zero-sequence current B2；
13) zero-sequence current B is captured2Value is stored in the second capture input module, if time-out will move out, prompts user trial Failure, check circuit；
14) capture A is calculated2With B2Phase difference ψ2；
15) phase-shift circuit parameter is adjusted, makes the residual voltage shifting after phase shift and zero-sequence current in the second leakage analog circuit Same phase, gather the residual voltage after phase shift；
16) the A/D modular converters of master controller are started to the residual voltage after phase shift in the second leakage analog circuit and shifting The zero-sequence current B of phase front2Vector sum SbCarry out 64 conversions；
17) leak(age) test switch S is cut off2；
18) digital filtering processing is carried out to the sampled value of gained in step 15, and calculates arithmetic mean of instantaneous value E2；
If 19) 0.85 ψ1<ψ2<1.1ψ1,E2>0.9E1Then think adaptive success；
20) the adaptive success of display.
The non-reliability earthed system self-adaption route selection earth leakage protecting method of three-phase provided by the invention, by artificially simulating Lou Electric fault capture electric leakage characteristic value, realizes the accurate route selection of residual current protective unit.
Disclosed above is only the specific embodiment of the application, but the application is not limited to this, any this area Technical staff can think change, should all fall in the protection domain of the application.

Claims (7)

1. a kind of non-reliability earthed system self-adaption route selection leakage protection system of three-phase, including the leakage detected based on power direction Electric protection unit, it is characterised in that also including self-adaptive features collecting unit,
The self-adaptive features collecting unit is used for leakage analog, to capture electric leakage feature, and passes through adjustment circuit parameter adaptation Residual current protective unit, the self-adaptive features collecting unit include：
Collection apparatus primary circuit, the collection apparatus primary circuit include two single-phase earth leakage for connecting not isopen simulation electricity Road；
Control unit, the control unit includes receiving and the master control group master controller of processing gathered data and adjustment circuit parameter, two Hysteresis loop comparator, precision rectifer and the low pass filter of individual corresponding single-phase earth leakage analog circuit.
2. the non-reliability earthed system self-adaption route selection leakage protection system of three-phase as claimed in claim 1, it is characterised in that The collection apparatus primary circuit includes：
First single-phase earth leakage analog circuit, the first single-phase earth leakage analog circuit include resistance R in parallel1With electric capacity C1, and match somebody with somebody It is equipped with the switch S of control circuit break-make1, the first single-phase earth leakage analog circuit one end ground connection；
Second single-phase earth leakage analog circuit, the second single-phase earth leakage analog circuit include resistance R in parallel2With electric capacity C2, and match somebody with somebody It is equipped with the switch S of control circuit break-make2, the second single-phase earth leakage analog circuit one end ground connection；
Wherein, S is switched1And S2Opening and closing are controlled by control unit.
3. the non-reliability earthed system self-adaption route selection leakage protection system of three-phase as claimed in claim 2, it is characterised in that The resistance R1=20K, the electric capacity C1=1nF,
The resistance R2Value is in resistance R1Three/with between half, the electric capacity C2Value is in electric capacity C1Three points One of between half.
4. the non-reliability earthed system self-adaption route selection leakage protection system of three-phase as claimed in claim 2, it is characterised in that The master controller includes：
Input module is captured, the capture input module connects single-phase earth leakage analog circuit by hysteresis loop comparator respectively, is used for Deposit the circuit parameter received；
Phase shifting control module, for adjustment phase place；
A/D modular converters；
Man-machine interface；
Communication interface；
Test sampling control module.
5. a kind of non-reliability earthed system self-adaption route selection earth leakage protecting method of three-phase, it is characterised in that based on power side To on the basis of the residual current protective unit of detection, self-adaptive features collecting unit is added, when electric network composition changes, is led to Cross self-adaptive features collecting unit capture electric leakage characteristic parameter and adjustment circuit parameter be to adapt to the residual current protective unit,
The self-adaptive features collecting unit obtains residual voltage phase and zero-sequence current before phase shift by simulating leak current fault The parameter of phase, phase-shift circuit parameter is then adjusted, makes the residual voltage after phase shift and the same phase of zero-sequence current, to zero before phase shift Residual voltage after sequence electric current and phase shift seeks vector sum, and using the electric signal after gained vector sum progress precision rectifying as route selection Characteristic value.
6. the non-reliability earthed system self-adaption route selection earth leakage protecting method of three-phase as claimed in claim 5, it is characterised in that The self-adaptive features collecting unit includes：
Collection apparatus primary circuit, the collection apparatus primary circuit include two single-phase earth leakage analog circuits, i.e., first is single-phase Leakage analog circuit and the second single-phase earth leakage analog circuit；The first single-phase earth leakage analog circuit includes resistance R in parallel1With Electric capacity C1, and it is configured with the switch S of control circuit break-make1, the first single-phase earth leakage analog circuit one end ground connection；Described second Single-phase earth leakage analog circuit includes resistance R in parallel2With electric capacity C2, and it is configured with the switch S of control circuit break-make2, described second Single-phase earth leakage analog circuit one end is grounded；Wherein, S is switched1And S2Opening and closing are controlled by a control unit；
The control unit includes receiving and the master controller of processing gathered data and adjustable circuit parameter, two single-phase leakages of correspondence The hysteresis loop comparator of electrical analogue circuit and the accurate reorganizer that master controller is connected by a low pass filter；Wherein, it is described Master controller includes two and is used to deposit the capture input module of the circuit parameter received, the phase shifting control for adjustment phase place Module, A/D modular converters, man-machine interface, communication interface and experiment sampling control module, wherein capture input module includes the One capture input module and the second capture input module；
Terminal operating system, the terminal operating system connects master controller by the man-machine interface, and passes through master controller Controlling feature gathers primary circuit, and the terminal operating system is provided with obtains institute by collection apparatus primary circuit and control unit State the operating process of the electric leakage parameter of residual current protective unit.
7. the non-reliability earthed system self-adaption route selection earth leakage protecting method of three-phase described in claim 6, it is characterised in that Self-adaptive features collecting unit is tested when leaking electricity characteristic parameter to obtain, the operating process of terminal operating system include with Lower step：
1) electric leakage signal collection or experimental order are inputted；
2) the switch S in the first single-phase earth leakage analog circuit is controlled1Closure；
3) residual voltage A is captured1Value is stored in the first capture input module, if time-out will move out, terminal operating system prompting is used Family test failure, circuit is checked, if it is successful, preparing capture zero-sequence current B1；
4) zero-sequence current B is captured1Value is stored in the second capture input module, if time-out will move out, terminal operating system prompting is used Family test failure, check circuit；
5) residual voltage A is calculated1With zero-sequence current B1Phase difference ψ1；
6) phase-shift circuit parameter is adjusted, the residual voltage after phase shift is moved with the same phase of zero-sequence current, the zero sequence electricity after collection phase shift Pressure；
7) the A/D modular converters of master controller are started to the zero-sequence current B before phase shift1With the vector sum of the residual voltage after phase shift SaCarry out 64 conversions；
8) leak(age) test switch S is cut off1；
9) to carrying out digital filtering processing to the sampled value of gained in step 7, and arithmetic mean of instantaneous value E is calculated1；
10) E is stored1With phasor difference ψ1Information；
11) the switch S in the second single-phase earth leakage analog circuit is controlled2Closure；
12) residual voltage A is captured2Value is stored in the first capture input module, if time-out will move out, prompts user trial failure, Check circuit；If it is successful, prepare capture zero-sequence current B2；
13) zero sequence electric power B is captured2Value is stored in the second capture input module, if time-out will move out, prompts user trial failure, Check circuit；
14) capture A is calculated2With B2Phase difference ψ2；
15) phase-shift circuit parameter is adjusted, makes the residual voltage shifting after phase shift and the same phase of zero-sequence current in the second leakage analog circuit, Gather the residual voltage after phase shift；
16) before the A/D modular converters of startup master controller are to the residual voltage after phase shift in the second leakage analog circuit and phase shift Zero-sequence current B2Vector sum SbCarry out 64 conversions；
17) leak(age) test switch S is cut off2；
18) digital filtering processing is carried out to the sampled value of gained in step 16, and calculates arithmetic mean of instantaneous value E2；
If 19) 0.85 ψ1<ψ2<1.1ψ1,E2>0.9E1Then think adaptive success；
20) the adaptive success of display.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111585244A (en) * 2020-05-26 2020-08-25 芯海科技（深圳）股份有限公司 Leakage protection circuit, integrated circuit, electronic device, and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2063309U (en) * 1990-03-12 1990-10-03 郑秉阳 Multifunction protector for high-voltage electric leakage
US6025980A (en) * 1998-08-10 2000-02-15 General Electric Company Earth leakage protective relay
CN101026295A (en) * 2006-12-21 2007-08-29 王小华 Non-grounding neutral point system low-voltage leakage protection method and its equipment
CN202940556U (en) * 2012-09-04 2013-05-15 北京矿能科技有限公司 Mining explosion-proof type low-voltage power grid multi-level electric leakage protector
CN204167872U (en) * 2014-11-25 2015-02-18 山西潞安环保能源开发股份有限公司常村煤矿 Underground coal mine electrical network selective earth leakage protection checkout gear
CN104934925A (en) * 2015-06-01 2015-09-23 沈阳基辅新能源科技发展有限公司 Selective electric leakage protection system for low-voltage power grid of underground coal mine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2063309U (en) * 1990-03-12 1990-10-03 郑秉阳 Multifunction protector for high-voltage electric leakage
US6025980A (en) * 1998-08-10 2000-02-15 General Electric Company Earth leakage protective relay
CN101026295A (en) * 2006-12-21 2007-08-29 王小华 Non-grounding neutral point system low-voltage leakage protection method and its equipment
CN202940556U (en) * 2012-09-04 2013-05-15 北京矿能科技有限公司 Mining explosion-proof type low-voltage power grid multi-level electric leakage protector
CN204167872U (en) * 2014-11-25 2015-02-18 山西潞安环保能源开发股份有限公司常村煤矿 Underground coal mine electrical network selective earth leakage protection checkout gear
CN104934925A (en) * 2015-06-01 2015-09-23 沈阳基辅新能源科技发展有限公司 Selective electric leakage protection system for low-voltage power grid of underground coal mine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王其军: "基于零序功率方向原理的矿井漏电保护装置设计", 《煤炭科学技术》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111585244A (en) * 2020-05-26 2020-08-25 芯海科技（深圳）股份有限公司 Leakage protection circuit, integrated circuit, electronic device, and method
CN111585244B (en) * 2020-05-26 2022-09-16 芯海科技（深圳）股份有限公司 Leakage protection circuit, integrated circuit, electronic device, and method

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