CN105226634B - A kind of (TT) distribution system - Google Patents
A kind of (TT) distribution system Download PDFInfo
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- CN105226634B CN105226634B CN201410226374.5A CN201410226374A CN105226634B CN 105226634 B CN105226634 B CN 105226634B CN 201410226374 A CN201410226374 A CN 201410226374A CN 105226634 B CN105226634 B CN 105226634B
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Abstract
The present invention is a kind of security of rural power grid protection system with breaking protection function, the end of incoming cables of main junction box 300 is connect by total line 200 with transformer 100, leading-out terminal is connect by main line 400 with branch distribution case 500；Setting at least one has the device 310 for 3P+N or the 4P defencive function with ground for protecting main line 400, at least a main line break line treatment device 320 in main junction box 300；400 end of main line is provided with electronic type signal acquisition/feedback device 410；It is provided with branch distribution case 500 between main line 400 and branched line 600,2P the or 3P+N breaker 510 and branched line break line treatment device 520 of protection branched line 600 are provided in branch distribution case 500；The end of incoming cables of family distribution box 700 is divided to connect by unique branch route 600 with branch distribution case 500.TT distribution system main line and branched line breaking protection can be achieved in the present invention, is suitble to use in the more rural power grids of overhead line, can effectively improve power voltage supply system safety in operation.
Description
Technical field
The present invention relates to a kind of, and the security of rural power grid with breaking protection function protects system, belongs to agricultural network field.
Background technique
Low-tension network by power-supply system can grounding point Grounding Types and protective grounding pattern it is different, be often divided into TN system
System, TT system and IT system.For secure context, IT system is safer with respect to TN, TT system, but IT system category phase three-wire three
System processed, can only be with a kind of 380V voltage for living load electricity consumption, so IT system and uneconomical, it is only applicable to require to compare
Safety, route are able to maintain higher dielectric level, capacitive earth current lesser place again.TN system divide again TN-S, TN-C,
Tri- kinds of patterns of TN-C-S, wherein TN-S is three-phase five-wire mode distribution system, and investment cost is somewhat expensive, general only to use in city.
So our, the most commonly used is TN-C or TN-C-S systems in rural area low-tension network past, it is in fact not tight to both earthing modes
Lattice are distinguished, and are referred to as connecing zero system.But practice have shown that, for the countryside low-voltage electric distribution network that load, route are grown again, adopt
It is more with problem when TN system, so the earthed system of the three-phase four-wire system distribution system of rural area low-tension network now
Be widely used TT system, i.e., power-supply system can grounding point with what electrical equipment exposed conductive part was directly grounded respectively be
System, that is, protection system to earth described in the past.Meanwhile power industry standard DL/T499 " rural area low-voltage power technology rule
Journey " in 3.4.1 also provide: " rural area low-tension network preferably uses TT system ".
It is provided according to professional standard, rural power grids must implement residual current protecting when using TT system.This is because in TT system
In system, the voltage-to-ground 110V of long-term existence danger is still had electric shock when people touches by electrical equipment exposed conductive part
Dangerous.Therefore, earth leakage protective device is preferably installed, when ground short circuit occurs, cuts off circuit rapidly to protect personal safety.This is just
It is to require the basic reason that we are user installation earth leakage protective device in the upgrading of rural power grids why.Establishing criteria regulation, general agriculture
Net TT system generally comprise residual current always protect, residual current middle rank protection (when necessary) and residual current final stage protect.Though
Right standard regulation installing Aftercurrent protecting equipment at different levels in agricultural network prevents electric shock accidents, but in recent years I
State's accident rate of getting an electric shock and dying still is much higher than developed country in the world, and electric shock accidents occurs mainly in rural area, rural area touching
Electrification is as many as 6 times of city, and is exactly overhead line, house lead in, temporary electricity in terms of the main performance of rural area electric shock
Route electric shock.Analysis according to statistics, the electric shock accidents occurred on rural area overhead line, service conductor, temporary electricity route are unexpectedly high
Up to 70% or more, and constitute electric shock accidents factors in, electric shock accidents caused by an only factor less than 10%,
90% or more electric shock accidents is as caused by two or more factors.For example, because of lightning stroke, strong wind, mud-rock flow, cunning
The force majeure such as slope cause the failures such as overhead line ground connection, broken string, and someone is then bare-handed to move with the hand, picks up the live wire for breaking and falling etc..
This is mainly due to: in rural power grids, overhead line is disconnected when falling in dry plot, dry vegetation, suspension near the ground, will not be to big
Ground generates sufficiently large leakage current or leakage current, Aftercurrent protecting equipment cannot be made to trip, but in the case of above,
Serious accident potential can be generated to accessible people and animals.
In this regard, patent 201110144305.6 " distribution system break line detection device, system and method, meter copying device, relaying
Device, control device " a kind of broken wire detection system in high tension distribution system is proposed, the major defect of this system is system Pang
Greatly, applicability, poor reliability.Patent 01116465.4 " power supply line breaking accident potential method for removing and device " proposes one
Kind three-phase and four-line circuit breaking detection method, realizes breaking protection function by detection route moderate heat line Ground leakage current size
Can, therefore, it cannot achieve breaking protection function if firewire in route disconnects, and such as to realize breaking protection function, need
Distal tip signal is detected and differentiates that circuit is individually powered, therefore increases the complexity of system, reduces reliability.Meanwhile
Do not find the thread-breakage protecting for rural power grids distribution system also at present.In consideration of it, the present invention provides a kind of (TT) to match
Electric system, it can be achieved that (TT) distribution system main line and branched line breaking protection function, be particularly suitable for rural power grids frame
The more situation of ceases to be busy can effectively improve power voltage supply system safety in operation.
Summary of the invention
The present invention provides a kind of (TT) distribution system, it can be achieved that (TT) distribution system main line and branched line broken string are protected
Shield, is particularly suitable for using in the more rural power grids of overhead line.Specific technical solution is as follows:
A kind of (TT) distribution system, including transformer 100, total line 200, main junction box 300, at least one main line
400, more branch distribution casees 500, a plurality of branched line 600, the family Duo Taifen distribution box 700, a plurality of point of family route 800, multiple
User terminal 900.The end of incoming cables of main junction box 300 is connect by total line 200 with transformer 100, and leading-out terminal passes through main line
400 connect with branch distribution case 500；Branch distribution case 500 is provided between main line 400 and branched line 600；Divide family distribution
700 end of incoming cables of case is connect with branched line 600.
Setting at least one has protection main line 400 3P+N or 4P defencive function with ground in main junction box 300
Device 310, at least a break line treatment device 320,300 output end of main junction box connect main line 400,400 end of main line
Be provided with electronic type signal acquisition/feedback device 410, electronic type signal acquisition/feedback device 410 using communication or
It is communicated by main line 400 using carrier system and break line treatment device 320, realizes the breaking protection of main line.
It is provided with protection branched line 600 2P or 3P+N breaker 510 in branch distribution case 500 and branched line breaks
Processing unit 520.It is provided in point family distribution box 700 and provides the branch of disconnection signal to branched line break line treatment device 520
The high resistant resistant to device 710 of circuit breaking signal device realizes the breaking protection of branched line, branched line break line treatment device
520 are connected with branched line disconnection signal device 710 by unique branched line 600.
Further:
The device 310 of 3P+N or 4P defencive function with ground in main junction box 300 is breaker, can also have overload to protect
Shield, short-circuit protection and creepage protection function；
Break line treatment device 320 can be communicated with multiple electronic type signal acquisition/feedback devices 410 communicated,
When detecting at least one main line 400 generation disconnection fault, alarm signal can be outwardly issued, also can control at least one electronics
Formula breaker 310 disconnects, and can also be communicated with the external world.
When branched line 600 breaks, break line treatment device 520 is filled by the driving that an electric energy is converted into electromagnetic energy
Setting 540 disconnects breaker 510, guarantees 600 no-voltage of branched line.
In addition to this:
When dividing the master switch of family distribution box 700 not have creepage protection function, should be arranged in the branch distribution case 500
Earth leakage protective device 530, earth leakage protective device 530 should disconnect branch line by driving breaker 520 when electrical leakage is more than design value
Road 600, or (and) outwardly issue leakage-current alarm signal.
The settable earth leakage protective device 330 of main junction box 300, earth leakage protective device 330 can be separately provided, can also be with electronics
310 cooperating of formula breaker, may also be arranged on inside electronic breaker 310.
Detailed description of the invention
Fig. 1 is (TT) distribution system schematic diagram；
Fig. 2 is 1 main line burn out detection realization principle block diagram of embodiment；
Fig. 3 is 1 branched line burn out detection realization principle block diagram 1 of embodiment；
Fig. 4 is 1 branched line burn out detection realization principle block diagram 2 of embodiment；
Fig. 5 is 2 main line burn out detection realization principle block diagram of embodiment；
Fig. 6 is the main line burn out detection realization principle block diagram of embodiment 4.
Specific embodiment
Specific implementation of the invention is specifically described below by specific embodiment, and by attached drawing.
Embodiment 1:
A kind of (TT) distribution system, is shown in attached drawing 1, including transformer 100, total line 200, main junction box 300, at least one
Main line 400, more branch distribution casees 500, a plurality of branched line 600, the family Duo Taifen distribution box 700, a plurality of point of family route
800, multiple user terminals 900.The end of incoming cables of main junction box 300 is connect by total line 200 with transformer 100, and leading-out terminal is logical
Main line 400 is crossed to connect with branch distribution case 500；Branch distribution case 500 is provided between main line 400 and branched line 600；
Distribution box 700 end of incoming cables in family is divided to connect with branched line 600.
Main line burn out detection function is by being located at a main line break line treatment device 320 of main line head end and being located at master
Several electronic type signal acquisitions of line end/feedback device 410 is realized, sees attached drawing 2.Electronic type signal acquisition/feedback dress
It sets 410 and is responsible for acquisition main line line state for the inquiry of main line break line treatment device 320, or when disconnection fault occurs to main line
Break line treatment device 320 issues information.Main line break line treatment device 320, can be to when receiving the information of main line failure
The external world issues alarm or disconnects Main line signals, achievees the purpose that Electrical Safety.410 benefit of electronic type signal acquisition/feedback device
It is got in touch with power line carrier by main line 400 and main line break line treatment device 320, completes data communication between the two.
320 timing of main line break line treatment device issues inquiry instruction, electronic type signal to electronic type signal acquisition/feedback device 410
Acquisition/feedback device 410 is when receiving inquiry instruction, to 320 response feedback main line of main line break line treatment device, 400 shape
State, in confirmation main line 400 there are when disconnection fault, main line break line treatment device 320 is alarmed or is disconnected according to default sending
Main line 400 instructs, and is not received by electronic type signal acquisition/feedback device 410 in main line break line treatment device 320 and answers
When answering signal, it is believed that there are disconnection faults, according to default sending alarm signal or/and can also disconnect main line 400.
Main line break line treatment device 320 is mainly by power circuit unit, carrier signal modulation demodulating unit, logic calculation
Unit and output control unit composition.Power circuit unit is powered by major loop three-phase and four-line AC power source, and AC power source is turned
Low-voltage dc power supply is changed to use for wire breakage detector.As long as ensure that any phase has electric control using three-phase and four-line power supply
Device can work normally.Carrier signal modulation demodulating unit is responsible for inquiry instruction is modulated rear by being transmitted to electronics under power line
Formula signal acquisition/feedback device 410, while the information that electronic type signal acquisition/feedback device 410 is fed back is received, it is demodulated
Logic computing unit is given in processing；Logic computing unit is by carrier signal modulation demodulating unit to electronic type signal acquisition/anti-
It presents device 410 and sends inquiry instruction, inquiry main line whether there is disconnection fault；Pass through carrier signal modulation demodulating unit simultaneously
The information that electronic type signal acquisition/feedback device 410 after receiving demodulation is fed back.Output control unit receives logic calculation
The alarm or action command that unit issues, carry out sound/optical electrical alarm or driving execute component and cut off main line, can also pass through
Communication modes issue alarm signal.
Electronic type signal acquisition/feedback device 410, mainly by power circuit unit, signal acquisition unit, logic calculation list
Member and carrier signal modulation demodulating unit composition.Power circuit unit is powered by major loop three-phase and four-line AC power source, exchange
Power supply is converted to low-voltage dc power supply and uses for wire breakage detector.As long as ensure that any both threads using three-phase and four-line power supply
There is electricity to can guarantee that controller works normally.Increase storage capacitor in power circuit unit DC low-voltage circuit end, it is ensured that
There are enough energy to issue feedback signal to wire breakage detector after three-phase and four-line breaks completely.Signal acquisition unit is to connection
It is sampled in the three-phase and four-line power supply system of power end, determines that there are two types of acquisition modes with the presence or absence of disconnection fault in circuit:
It is a kind of directly to acquire three phase lines to the voltage zero curve, it can not only be detected in system in this way with the presence or absence of broken string, moreover it is possible to
Enough detect that failure occurs in that phase line or zero curve.Another kind is three-phase four wire system to be divided into two groups, and one group is to appoint
It anticipates a phase voltage between phase line and zero curve, another group of line voltage for other two phase lines composition, signal acquisition process electricity
Broken voltage line signal is transformed to digital signal by road, is identified for logic computing unit.Carrier signal modulation demodulating unit receives master
Circuit breaking processing unit instruction and it is demodulated give electronic type signal acquisition/feedback device 410 logic computing unit, together
When can also the feedback signal of signal acquisition unit it is modulated after issue main line break line treatment device.Logic computing unit receives
After the inquiry instruction that main line break line treatment device issues, signal acquisition unit treated result is fed back by main line and is arrived
Main line break line treatment device actively can also issue broken string letter to main line break line treatment device after detecting main line broken string
Breath.
Branched line broken string takes the mode of head end detection electric current to sentence branched line 600 with the presence or absence of disconnection fault
Disconnected, both branched line break line treatment device 520 and branched line disconnection signal device 710 are one-to-one relationship, and the two is logical
It crosses unique branched line 600 to connect, for detect branched line 600 between the two with the presence or absence of the situation that breaks, sees attached drawing
3.By whether there is 710 He of branched line disconnection signal device in 520 detection branches route 600 of branched line break line treatment device
The current signal that other loads generate, if electric current is not present in branched line 600, there are voltage signals between line, then it is assumed that point
There are disconnection fault, branched line break line treatment devices 520 to cut off the power supply of branched line 600 for branch line 600, ensures electricity consumption peace
Normally open it can break between full branched line disconnection signal device 710 and branched line break line treatment device 530 without any
Point prevents from artificially disconnecting breakpoint and causes 530 erroneous judgement of branched line break line treatment device.Branched line disconnection signal device 710
Low current can be generated in 600 normal power supply of branched line, for preventing after branched line 600 without other load time-divisions
520 erroneous judgement of branch line break line treatment device.
Branched line break line treatment device 520 includes logic computing unit, output control unit, power circuit unit, electricity
Flow signal acquisition unit and current signal processing unit.Current signal acquisition unit uses the mutual inductor with high permeability iron core
Current signal is acquired, main circuit current signal is converted to the voltage signal that signal processing unit can receive, then
Signal is transmitted to current signal processing unit.Current signal processing unit provides signal acquisition unit using operational amplifier
Small voltage signal amplify processing, and analog signal is converted to the digital signal that characterization judges whether broken string, then
Digital signal sends logic computing unit, the voltage and current signals in logic computing unit comprehensive descision circuit, judgement point to
Control signal is then exported if there is disconnection fault with the presence or absence of disconnection fault in branch line.Output control unit, which receives, patrols
Pass through acousto-optic electric alarm or cutting branched line power supply after collecting the action signal of computing unit output.
High impedance load realization of the branched line disconnection signal device 710 using concatenation between online, for single phase poaer supply, directly
It connects and is concatenated between L, N, see attached drawing 3.For three-phase four wire system, two loads can be increased, a load is added in any one
Between phase line and zero curve, another is serially connected between other two phase lines, is guaranteed when there is supply voltage, branched line
Any conducting wire has electric current to pass through, and sees attached drawing 4.
Embodiment 2
Relative to embodiment 1, the transmission of main line burn out detection signal uses wireless communication mode in embodiment 2, in main line
It is designed with wireless transport module inside road break line treatment device 320 and electronic type signal acquisition/feedback device 410, sees attached drawing 5.
Electronic type signal acquisition/feedback device 410 is detecting that main line 400 there are when disconnection fault, fills to main line break line treatment
320 sending main line disconnection informations are set, main line break line treatment device 320 is when receiving disconnection information, according to user preset,
Instruction is issued, alarm signal or/and cutting main line 400 is outwardly issued, guarantees Electrical Safety.
The polarity free capacitor with certain pressure resistance of the branched line disconnection signal device 710 using concatenation between online.Other
Part is same as Example 1, and details are not described herein.
Embodiment 3
The main line breaking protection function implementation of embodiment 3 is identical as embodiment 1 or 2.Relative to embodiment 1 and in fact
Example 2 is applied, branched line breaking protection function implementation is also realized using mode identical with main line breaking protection function, i.e.,
In a break line treatment device of the head end of every branched line, while electronic type signal acquisition/feedback device is arranged in end, leads to
Collection voltages signal is crossed to realize breaking protection function.
Embodiment 4
The main line breaking protection function implementation of embodiment 4 is same as Example 3.Relative to embodiment 3, in main line
Each node increases setting electronic type signal acquisition/feedback device on the road, each node will be between processing unit 320
It is communicated, processing unit 320 judges the broken string state and broken position of distribution line according to the operation conditions of node comprehensively, tool
Body implementation is shown in Fig. 6.
Claims (7)
1. a kind of TT distribution system, including transformer (100), total line (200), main junction box (300), at least one main line
(400), more branch distribution casees (500), a plurality of branched line (600), the family Duo Taifen distribution box (700), a plurality of point of family route
(800), multiple user terminals (900), it is characterised in that:
The end of incoming cables of the main junction box (300) is connect by total line (200) with transformer (100), and leading-out terminal passes through main line
Road (400) is connect with branch distribution case (500)；
Setting at least one has protection main line (400) 3P+N or 4P protection function with ground in the main junction box (300)
The device (310) of energy, at least a main line break line treatment device (320)；
Main line (400) end is provided with electronic type signal acquisition/feedback device (410)；The electronic type signal acquisition/
Feedback device (410) is responsible for acquisition main line line state and is inquired for the main line break line treatment device (320), or is breaking
Information is issued to the main line break line treatment device (320) when failure；
It is provided with branch distribution case (500) between the main line (400) and branched line (600), in branch distribution case (500)
It is provided with protection branched line (600) 2P or 3P+N breaker (510) and branched line break line treatment device (520)；It is described
The end of incoming cables of family distribution box (700) is divided to connect by unique branch route (600) with branch distribution case (500), leading-out terminal passes through
Family route (800) are divided to connect at least one user terminal (900),
The main line break line treatment device (320) is a kind of electronic device, the electronic type signal that can be communicated with one or more
Acquisition/feedback device (410) is communicated；When detecting at least one main line (400) generation disconnection fault, outwardly issue
Alarm signal, or device (310) disconnection of at least one defencive function with ground is controlled, or communicated with the external world,
When branched line (600) breaks, the branched line break line treatment device (520) passes through a driving device
(540) breaker (510) are disconnected, guarantee branched line (600) no-voltage.
2. a kind of TT distribution system as described in claim 1, it is characterised in that:
The electronic type signal acquisition/feedback device (410) utilizes carrier wave using communication or by main line (400)
Mode is communicated with main line break line treatment device (320).
3. a kind of TT distribution system as described in claim 1, it is characterised in that:
The branched line disconnection signal device (710) being arranged in described point of family distribution box (700) be connected to phase line and zero curve or
High resistant resistant to device or electronic type signal acquisition/feedback device (410) between phase line and phase line.
4. a kind of TT distribution system as described in claim 1, it is characterised in that:
The device (310) of the 3P+N or 4P defencive function with ground is electronic breaker, has overload protection, short-circuit protection
And creepage protection function.
5. a kind of TT distribution system as described in claim 1, it is characterised in that:
When dividing the master switch of family distribution box (700) not have creepage protection function, should be arranged in the branch distribution case (500)
Earth leakage protective device (530)；Earth leakage protective device (530) driving breaker (510) when electrical leakage is more than design value, which disconnects, to divide
Branch line (600), and/or outwardly issue leakage-current alarm signal.
6. a kind of TT distribution system as described in claim 1, it is characterised in that:
The driving device (540) is the device for converting electrical energy into electromagnetic energy, drives breaker (510) separating brake open-circuit line.
7. a kind of TT distribution system as claimed in claim 4, it is characterised in that: main junction box (300) the setting electric leakage is protected
Protection unit (330), earth leakage protective device (330) are separately provided, with electronic breaker (310) cooperating；It is arranged in electronics
Formula breaker (310) is internal.
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| CN201410226374.5A CN105226634B (en) | 2014-05-27 | 2014-05-27 | A kind of (TT) distribution system |
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| CN201410226374.5A CN105226634B (en) | 2014-05-27 | 2014-05-27 | A kind of (TT) distribution system |
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| CN105226634B true CN105226634B (en) | 2019-05-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105870891B (en) * | 2016-04-25 | 2018-06-22 | 华北电力大学（保定） | Fault detect and partition method suitable for multiple-limb low-voltage direct distribution system |
| CN112653118B (en) * | 2020-12-18 | 2023-12-22 | 重庆瑞盾科技发展有限公司 | Custom individual selection unit and intelligent standby electric control system for custom individual |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2755833Y (en) * | 2004-03-28 | 2006-02-01 | 华南理工大学 | Fire-proof safety electricity energy central metering device against electric shock and steal |
| CN101102056A (en) * | 2007-08-07 | 2008-01-09 | 李乾伟 | Multi-level switch system for power line disconnection protection |
| CN201733067U (en) * | 2010-04-20 | 2011-02-02 | 山东卓尔电气有限公司 | Multi-path residual current monitoring device with wireless or carrier transmission module |
| JP5455786B2 (en) * | 2010-05-27 | 2014-03-26 | 株式会社日立製作所 | Distribution system disconnection detection device, distribution system disconnection detection system, meter-reading device, relay device, control device, and distribution system disconnection detection method |
| CN202383230U (en) * | 2011-12-31 | 2012-08-15 | 代建军 | Open circuit detection device for distribution circuits |
| CN102938558A (en) * | 2012-11-26 | 2013-02-20 | 保定供电公司 | Low-voltage distribution system with leakage protection device |
| CN103280784A (en) * | 2013-05-30 | 2013-09-04 | 孟津县电业公司 | Neutral line breakage protection method and neutral line breakage protector |
| CN203983988U (en) * | 2014-05-27 | 2014-12-03 | 首瑞（北京）投资管理集团有限公司 | A kind of (TT) distribution system |
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2014
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| 浅谈低压配电线路的断线保护;王义刚;《建材发展导向（下）》;20101130;第8卷(第6期);第93-94页 |
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