CN104617563B - The special protective relaying device of ring main unit - Google Patents
The special protective relaying device of ring main unit Download PDFInfo
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- CN104617563B CN104617563B CN201510022283.4A CN201510022283A CN104617563B CN 104617563 B CN104617563 B CN 104617563B CN 201510022283 A CN201510022283 A CN 201510022283A CN 104617563 B CN104617563 B CN 104617563B
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- main unit
- ring main
- protective relaying
- relaying device
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Abstract
The invention discloses the special protective relaying device of ring main unit, it is characterised in that：Including hermetically sealed metal cabinet, the wide scope acquisition control circuit being arranged in hermetically sealed metal cabinet and draw line terminals, the hermetically sealed metal cabinet is integrally formed formula case body, the panel for being fixed on case body front end and the postnotum for being fixed on case body rear end, preceding sealing gasket, rear sealing gasket are respectively arranged between the case body and panel, postnotum, the extraction line terminals are arranged on postnotum by a waterproof assembling structure；The structure design that this product passes through optimization so that device degree of protection reaches IP65；Appearance and size is compact, and mounting means is flexible；Designed using pole wide scope Acquisition Circuit, ensure that electric current can meet acquisition precision under 0.02A ~ 100A scopes and have quick defencive function.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System, is exclusively used in more particularly, to one kind in urban power distribution network ring main unit
Protective relaying device.
Background technology
In urban power distribution network, medium voltage network largely uses ring network power supply pattern, and ring main unit is switchgear therein.Become
Power station send out electric energy each user terminal is fed to by ring main unit and power circuit, when user side breaks down need and
When disconnect corresponding ring main unit outlet switch, excision failure ensures main network system not by fault impact.
Protective relaying device obtains the operation conditions of power network by gathering electric current, voltage and status information, judges power network
Whether break down, as faulty, output signal controlling switch is disconnected to protect the safety of power network.Conventional relay protection dress
Put and be usually mounted on the switch board of special control room or on middle-placed switch cabinet, due to the temperature of running environment environment, humidity be in can
Control state, so not high to the protection level requirements of protective relaying device；Additionally due to the switch board of special control room or in put
The space of cabinet is bigger, therefore installation site, the size to protective relaying device are substantially unrestricted；And line load is run
It is relatively stable, to the current range requirement of protective relaying device collection than relatively low, typically require 0.2A ~ 100A.
And ring main unit is generally placed at open air, internal temperature range of operation is at -40 DEG C ~ 85 DEG C, interior humidity range of operation
0% ~ 100%；In addition, looped network cabinet is closely, cause to be available for the position of protective relaying device installation, size to have very much
Limit；And because the power consumption of urban distribution network electricity consumption user changes very greatly, therefore it is required that the collection electric current model of protective relaying device
Enclose higher, usually require that 0.02 A ~ 100A；Furthermore because the position of relay protection installation is in the end of distribution network, because
This requires the action response speed of relay protection, and The faster the better, causes expansion accident to avoid the failure of user terminal from spreading to major network
Scope.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of degree of protection to reach IP65；Appearance and size is compact, mounting means spirit
It is living；Current acquisition scope is big, precision is high and the special protective relaying device of ring main unit with quick defencive function.
The present invention is that technical scheme is used by solving its technical problem：
The special protective relaying device of ring main unit, it is characterised in that：Including hermetically sealed metal cabinet, it is arranged on hermetically sealed metal
Wide scope acquisition control circuit and extraction line terminals in casing, the hermetically sealed metal cabinet include being integrally formed formula case sheet
Body, the panel for being fixed on case body front end and the postnotum for being fixed on case body rear end, the case body and panel, postnotum it
Between be respectively arranged with preceding sealing gasket, rear sealing gasket, the extraction line terminals are arranged on postnotum by a waterproof assembling structure.
As the further improvement of such scheme, the waterproof assembling structure includes hole, the setting being opened on postnotum
In the sealing gasket drawn around line terminals and coordinate the boss of installation with hole and be set on boss, the sealing gasket is pressed on
Draw between line terminals boss and postnotum.
As the further improvement of such scheme, the upper and lower surface of the case body is respectively arranged with installing blind, described
Also installing blind is offered on postnotum.
Wherein, the wide scope acquisition control circuit include power module, CPU module and respectively with centre
Manage the connected power-frequency voltage acquisition module of device module, power current acquisition module, switching value acquisition module, tripping operation pulse output mould
Block, human-computer interface module, communication module.
Further, the CPU module includes the microprocessor and peripheral clock circuit that bus is 32,
The microprocessor includes memory, A/D modular converters, serial communication interface, real-time clock and power management module.
Further, the power-frequency voltage acquisition module include voltage transformer and by the voltage that A1 operational amplifiers form with
With device circuit, external voltage signal is connected to voltage transformer, and the voltage follower of A1 operational amplifiers composition is accessed after isolation
The input of circuit, the A/D converter of the output end access CPU module of voltage follower circuit complete voltage signal
Collection.
Further, the power current acquisition module includes current transformer and be made up of A2, A3 operational amplifier two
Road synchronizing amplifier circuit, foreign current are signally attached to current transformer, and A2, A3 operational amplifier composition are linked into after isolation
Two-way synchronizing amplifier circuit, the output of two-way synchronizing amplifier is connected respectively to the A/D converter of CPU module
Two inputs.
Further, the amplifier circuit multiplication factor that the A2 operational amplifiers are formed is putting for A3 operational amplifiers composition
10 times of big device circuit multiplication factor.
Further, the tripping operation pulse output module includes triode, tripping relay, current-limiting resistance, pulse energy storage electricity
Hold C and charging circuit, the base stage of the triode are connected with CPU module, the grounded emitter of triode, triode
Colelctor electrode be connected with tripping relay coil, the normally opened contact of tripping relay coil connects after being connected with pulse storage capacitor C
Faulty line is connected to, the normally opened contact of the tripping relay coil passes through current-limiting resistance with pulse storage capacitor C junction
It is connected with charging circuit, charging circuit and pulse storage capacitor C are also connected with power module respectively.
As the further improvement of such scheme, the microprocessor employs difference half-wave Fourier algorithms and calculates failure
Electric current.
The beneficial effects of the invention are as follows：The special protective relaying device of ring main unit of the present invention is made by the structure design of optimization
Obtain device degree of protection and reach IP65；Appearance and size is compact, and mounting means is flexible；Designed, protected using pole wide scope Acquisition Circuit
Card electric current can meet acquisition precision under 0.02A ~ 100A scopes and have quick defencive function.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described.Obviously, described accompanying drawing is the part of the embodiment of the present invention, rather than is all implemented
Example, on the premise of not paying creative work, other that can also be obtained according to these accompanying drawings are set those skilled in the art
Meter scheme and accompanying drawing：
Fig. 1 is structure decomposition figure of the embodiment of the present invention；
Fig. 2 is circuit theory diagrams of the embodiment of the present invention.
Embodiment
1 ~ Fig. 2 of reference picture, the special protective relaying device of ring main unit, including hermetically sealed metal cabinet, it is arranged on hermetically sealed gold
Belong to the wide scope acquisition control circuit in casing and draw line terminals, the hermetically sealed metal cabinet includes being integrally formed formula case sheet
Body 12, it is fixed on the panel 11 of the front end of case body 12 by preceding fixing screws 16 and is fixed on case body by rear fixing screws 17
The postnotum 13 of 12 rear ends, sealing gasket 14, rear sealing before being respectively arranged between the case body 12 and panel 11, postnotum 13
Pad 15, the extraction line terminals are arranged on postnotum 13 by a waterproof assembling structure；In order to ensure that the perforate has sealing anti-
Water effect, the waterproof assembling structure include be opened on postnotum 13 hole, be arranged on draw line terminals around and with hole coordinate
The boss of installation and the sealing gasket being set on boss, the sealing gasket be pressed on draw line terminals boss and postnotum 13 it
Between, fill out the space being filled with around leading-out terminal.Such a integral seal structure, it ensure that protection device degree of protection reaches
IP65 ranks.
Further, the upper and lower surface of the case body 12 is respectively arranged with installing blind 18, is also opened on the postnotum 13
Provided with installing blind, installing blind is embedded in described tank surface, and internal thread is tapped with hole；Installed using such three face
Blind hole structure, on the one hand ensure the sealing property of casing, on the other hand also cause protection device that there are three direction crystallized abilities,
Ensure unrestricted in narrow space installation.
With further reference to Fig. 2, the wide scope acquisition control circuit include power module 28, CPU module 21 and
Power-frequency voltage acquisition module 22, power current acquisition module 23, the switch acquisition being connected respectively with CPU module 21
Module 24, tripping operation pulse output module 25, human-computer interface module 26, communication module 27.
Wherein, the CPU module 21 includes the microprocessor and peripheral clock circuit that bus is 32,
The microprocessor includes memory, A/D modular converters, serial communication interface, real-time clock and power management module；This causes
Circuit structure is greatly simplified, and reduces circuit board size.
Further, the power-frequency voltage acquisition module 22 includes voltage transformer and the voltage being made up of A1 operational amplifiers
Follower circuit, external voltage signal are connected to voltage transformer, and the voltage follow of A1 operational amplifiers composition is accessed after isolation
The input of device circuit, the A/D converter of the output end access CPU module of voltage follower circuit complete voltage letter
Number collection.
Further, the power current acquisition module 23 includes current transformer and is made up of A2, A3 operational amplifier
Two-way synchronizing amplifier circuit, foreign current are signally attached to current transformer, and A2, A3 operational amplifier group are linked into after isolation
Into two-way synchronizing amplifier circuit, two-way synchronizing amplifier, which exports, is connected respectively to the A/D converter of CPU module
Two inputs；Wherein, the amplifier circuit multiplication factor that A2 operational amplifiers are formed is putting for A3 operational amplifiers composition
10 times of big device circuit multiplication factor, the A/D converter of CPU module gather the output letter of this two-way amplifier simultaneously
Number, the current signal result of calculation so obtained improves 10 times after integrated treatment than common single channel Acquisition Circuit precision.
Therefore, under equal accuracy requirement, the scope of current acquisition accordingly have also been enlarged 10 times, meets ring main unit and relay protection is filled
Put the requirement of current acquisition wide scope.
Further, the switching value acquisition module 24 includes photoelectric isolated chip, accesses the status signal of outside line, should
The input of photoelectric isolated chip is signally attached to, the output end of photoelectric isolated chip is directly connected to CPU module
I/O pins；The status signal of switching value acquisition module collection typically refers to the division state of line switching, or artificial division behaviour
Make the state switched, these signals participate in the logic discrimination of protection device as input quantity.
Further, the tripping operation pulse output module 25 includes triode, tripping relay, current-limiting resistance, pulse energy storage
Electric capacity C and charging circuit, the base stage of the triode are connected with CPU module, the grounded emitter of triode, three poles
The colelctor electrode of pipe is connected with tripping relay coil, after the normally opened contact of tripping relay coil is connected with pulse storage capacitor C
Faulty line is connected to, the normally opened contact of the tripping relay coil passes through current limliting electricity with pulse storage capacitor C junction
Resistance is connected with charging circuit, and charging circuit and pulse storage capacitor C are also connected with power module 28 respectively；Trip pulse output mould
The input of block is connected to the I/O pins of CPU module, receives the trip signal of controller；Output end is directly connected to
The breaking coil of line switching.During circuit normal operation, the charging circuit of module is filled by current-limiting resistance to pulse storage capacitor C
Electricity, when CPU module by monitoring voltage, electric current, switch input quantity signal analysis to line failure when, pass through
The I/O pins for being connected to tripping operation pulse output module input send 30ms tripping operation pulse signal, and the pulse signal passes through three
Pole pipe controls tripping relay R adhesives so that is connected to the pulse storage capacitor C on relay R contacts to outside breaking coil
High energy tripping operation pulse is released, control circuit switch trip completes line fault excision process.
Human-computer interface module 26 is connected by a plurality of I/O lines with CPU module 21, including liquid crystal display panel, and five
Key board and signal lamp；Liquid crystal display panel shows the information such as the voltage of circuit, electric current, state, setting value, event,
Five key boards receive the operational order of operating personnel, and signal lamp indicates the operation letter of protection device in a manner of more eye-catching
Breath, generally includes power supply status, protection device tripped condition etc..
Communication module 27 by receive and dispatch two I/O lines be connected with CPU module, signal after isolation with it is other
Intelligent terminal connects, and realizes the remote measurement and control function of protection device.
Power module 28 uses isolating switch power, including two groups of isolation and amplifiers, and one group of low-voltage output is supplied to above-mentioned
Each module is as working power；Another group of high voltage output is connected to the charging circuit of tripping operation pulse output module, gives tripping operation arteries and veins
Rush storage capacitor C chargings.
The quick protection of the microprocessor employs difference half-wave Fourier algorithms and calculates fault current method, due to this
The data window width that algorithm needs is equal to central processing unit per cycle sampling number/2 plus 1, therefore central processing unit is only in theory
Needing to wait for half of power frequency period or so time can detect that line fault, and this at least needs than conventional full wave Fourier algorithm
The acquisition time of one power frequency period shortens half or so.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalent variations on the premise of without prejudice to spirit of the invention or replace
Change, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (9)
1. the special protective relaying device of ring main unit, it is characterised in that：Including hermetically sealed metal cabinet, it is arranged on hermetically sealed metal box
Internal wide scope acquisition control circuit and extraction line terminals, the hermetically sealed metal cabinet include being integrally formed formula case body
(12), it is fixed on the panel (11) of case body (12) front end and is fixed on the postnotum (13) of case body (12) rear end, the case
Preceding sealing gasket (14), rear sealing gasket (15), the extraction are respectively arranged between body (12) and panel (11), postnotum (13)
Line terminals are arranged on postnotum (13) by a waterproof assembling structure；The waterproof assembling structure includes being opened in postnotum
(13) hole on, the sealing gasket drawn around line terminals and coordinate the boss of installation with hole and be set on boss, institute are arranged on
Sealing gasket is stated to be pressed between extraction line terminals boss and postnotum (13).
2. the special protective relaying device of ring main unit according to claim 1, it is characterised in that：The case body (12) it is upper
Lower two sides is respectively arranged with installing blind (18), and installing blind is also offered on the postnotum (13).
3. the special protective relaying device of ring main unit according to any one of claims 1 to 2, it is characterised in that：The wide scope
Acquisition control circuit includes power module (28), CPU module (21) and is connected respectively with CPU module (21)
Power-frequency voltage acquisition module (22), power current acquisition module (23),
Switching value acquisition module (24), tripping operation pulse output module (25), human-computer interface module (26), communication module (27).
4. the special protective relaying device of ring main unit according to claim 3, it is characterised in that：The CPU module
(21) comprising the microprocessor that bus is 32 and the clock circuit of periphery, the microprocessor includes memory, A/D is changed
Module, serial communication interface, real-time clock and power management module.
5. the special protective relaying device of ring main unit according to claim 4, it is characterised in that：The power-frequency voltage gathers mould
Block (22) includes voltage transformer and the voltage follower circuit being made up of A1 operational amplifiers, and external voltage signal is connected to electricity
Transformer is pressed, the input of the voltage follower circuit of A1 operational amplifiers composition is accessed after isolation, voltage follower circuit
The A/D converter of output end access CPU module completes voltage signal acquisition.
6. the special protective relaying device of ring main unit according to claim 4, it is characterised in that：The power current gathers mould
Block (23) includes current transformer and the two-way synchronizing amplifier circuit being made up of A2, A3 operational amplifier, foreign current signal
Current transformer is connected to, the two-way synchronizing amplifier circuit of A2, A3 operational amplifier composition is linked into after isolation, two-way is synchronous
Amplifier output is connected respectively to two inputs of the A/D converter of CPU module.
7. the special protective relaying device of ring main unit according to claim 6, it is characterised in that：The A2 operational amplifiers structure
Into amplifier circuit multiplication factor be that A3 operational amplifiers are formed 10 times of amplifier circuit multiplication factor.
8. the special protective relaying device of ring main unit according to claim 4, it is characterised in that：The tripping operation pulse output mould
Block (25) includes triode, tripping relay, current-limiting resistance, pulse storage capacitor C and charging circuit, the base stage of the triode
It is connected with CPU module, the grounded emitter of triode, the colelctor electrode of triode is connected with tripping relay coil, jumps
The normally opened contact of lock relay coil is connected to faulty line, the tripping relay coil after being connected with pulse storage capacitor C
Normally opened contact be connected with pulse storage capacitor C junction by current-limiting resistance with charging circuit, charging circuit and pulse storage
Energy electric capacity C is also connected with power module (28) respectively.
9. the special protective relaying device of ring main unit according to claim 4, it is characterised in that：The microprocessor employs
Difference half-wave Fourier algorithms calculate fault current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022283.4A CN104617563B (en) | 2015-01-16 | 2015-01-16 | The special protective relaying device of ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022283.4A CN104617563B (en) | 2015-01-16 | 2015-01-16 | The special protective relaying device of ring main unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104617563A CN104617563A (en) | 2015-05-13 |
| CN104617563B true CN104617563B (en) | 2018-02-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510022283.4A Active CN104617563B (en) | 2015-01-16 | 2015-01-16 | The special protective relaying device of ring main unit |
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| Country | Link |
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| CN (1) | CN104617563B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895930B (en) * | 2017-11-26 | 2023-11-07 | 湖北恒晶电气有限公司 | Intelligent on-site general microcomputer protection device and control method thereof |
| CN111063531A (en) * | 2020-01-07 | 2020-04-24 | 南方电网科学研究院有限责任公司 | Voltage transformer |
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|---|---|---|---|---|
| CN201852882U (en) * | 2010-09-29 | 2011-06-01 | 南京安能电气控制设备有限公司 | Module for protecting sampling of measurement signal in relay protection device |
| CN102810824A (en) * | 2012-08-31 | 2012-12-05 | 北京华电瑞通电力工程技术有限公司 | Solid-insulating fully-sealed device |
| CN203039436U (en) * | 2013-01-10 | 2013-07-03 | 浙江华健电子科技有限公司 | Microcomputer comprehensive protector for ring network cabinet |
| CN103545722A (en) * | 2012-07-16 | 2014-01-29 | 国家电网公司 | Secondary control device of intelligent ring main unit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2574208Y (en) * | 2002-04-09 | 2003-09-17 | 丁文军 | Integrative earth leakage protector |
| CN2826441Y (en) * | 2005-09-12 | 2006-10-11 | 江苏省电力公司常州供电公司 | Capacitance voltage-dividing sampling circuit of indoor looped network cabinet |
| CN201478715U (en) * | 2009-08-31 | 2010-05-19 | 山东泰开成套电器有限公司 | Low-voltage switch cabinet with high protection grade |
| WO2011080546A1 (en) * | 2009-12-31 | 2011-07-07 | Abb Technology Ltd | Electrical ring main unit |
-
2015
- 2015-01-16 CN CN201510022283.4A patent/CN104617563B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201852882U (en) * | 2010-09-29 | 2011-06-01 | 南京安能电气控制设备有限公司 | Module for protecting sampling of measurement signal in relay protection device |
| CN103545722A (en) * | 2012-07-16 | 2014-01-29 | 国家电网公司 | Secondary control device of intelligent ring main unit |
| CN102810824A (en) * | 2012-08-31 | 2012-12-05 | 北京华电瑞通电力工程技术有限公司 | Solid-insulating fully-sealed device |
| CN203039436U (en) * | 2013-01-10 | 2013-07-03 | 浙江华健电子科技有限公司 | Microcomputer comprehensive protector for ring network cabinet |
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| CN104617563A (en) | 2015-05-13 |
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