CN107290628A - A kind of line-selected earthing device based on low current - Google Patents
A kind of line-selected earthing device based on low current Download PDFInfo
- Publication number
- CN107290628A CN107290628A CN201710554377.5A CN201710554377A CN107290628A CN 107290628 A CN107290628 A CN 107290628A CN 201710554377 A CN201710554377 A CN 201710554377A CN 107290628 A CN107290628 A CN 107290628A
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- CN
- China
- Prior art keywords
- microcomputer
- master control
- control borad
- display module
- input terminal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
The invention discloses a kind of line-selected earthing device based on low current, it includes microcomputer and multiple ZCTs, serial communication interface is provided with microcomputer, ZCT is connected by serial communication interface with microcomputer, is connected in parallel with each other between ZCT on microcomputer；Voltage transformer is connected with the open delta on microcomputer, and voltage transformer, microcomputer and ZCT composition loop are simultaneously connected in bus outlet；Microcomputer includes master control borad, power panel, display module, IR remote controller, external analog amount input terminal, outside and opened into control button and warning circuit, outside intake input terminal, relay output end, CAN communication terminal, insulaion resistance monitor input terminal is integrated with master control borad；External analog amount input terminal is connected by power panel with master control borad；Warning circuit is connected by communication cable with master control borad；Outside is opened to be connected into control button by display module with master control borad；IR remote controller is connected by display module with master control borad.
Description
Technical field
Present invention relates particularly to a kind of line-selected earthing device based on low current.
Background technology
China's 3KV-66KV power distribution networks use small current neutral grounding mode, i.e. neutral non-effective grounding mode mostly, including
Isolated neutral system and neutral by arc extinction coil grounding system；The advantage of system with non effectively earth ed neutral is, sends out
Blow-out and it can recover to insulate automatically in most cases during raw single-phase earthing.But when occurring permanent earth fault, in order to anti-
Only cause failure propagation because non-faulting phase voltage is raised, it is necessary to determine faulty line as early as possible and cut off, this poses
Single-phase earth fault line selection problem；Current selection method, most of is all that earth fault is occurring for separate unit protective relaying device
When, steady-state characteristic when detection, analysis failure carries out route selection；But when actually occurring earth fault, protective relaying device can be by
To the influence of many factors such as system operation mode, circuit length and Load harmonic, and cause to falsely drop, leak choosing, multiselect.
The content of the invention
The purpose of the present invention for provide one kind can accurate and effective judge Small Electric Current Earthing And Routing Device falsely drop, leak choosing, it is many
Choosing, and can be widely used for the electric power system of power plant, power transformation large factories and mines enterprises in one's power as circuit and bus single-phase earthing therefore
Barrier alarm or the line-selected earthing device based on low current tripped for one-phase ground protection.
In order to reach foregoing invention purpose, the technical solution adopted by the present invention is：A kind of ground connection based on low current is provided
Line selection apparatus, it includes microcomputer and multiple ZCTs, and serial communication interface is provided with microcomputer, and ZCT passes through
Serial communication interface is connected with microcomputer, is connected in parallel with each other between ZCT on microcomputer；On voltage transformer and microcomputer
Open delta connection, voltage transformer, microcomputer and ZCT composition loop simultaneously be connected in bus outlet.
Microcomputer include master control borad, power panel, display module, IR remote controller, external analog amount input terminal, outside open into
Outside intake input terminal, relay output end, CAN communication end are integrated with control button and warning circuit, master control borad
Son, insulaion resistance monitor input terminal；External analog amount input terminal is connected by power panel with master control borad；Display module passes through
Communication cable is connected with master control borad；Warning circuit is connected by communication cable with master control borad；Outside, which opens to pass through into control button, to be shown
Show that module is connected with master control borad；IR remote controller is connected by display module with master control borad.
Further, master control borad by digital signal processor DSP, ferroelectric memory, sample circuit, relay group into, after
Electrical equipment is made up of protection divide-shut brake relay, guard relay, signal relay；Power panel is by transformer module and power module
Composition, transformer module is a kind of current-to-voltage converter module；Display module by it is active open into button, indicator lamp, LCD and
Infrared remote receiver is constituted.
Beneficial effects of the present invention are：Opening on the voltage transformer and microcomputer of the line-selected earthing device based on low current
Mouth triangle joint, to obtain its residual voltage, ZCT is connected in bus outlet, to obtain zero sequence electricity in bus outlet
Stream；Voltage transformer, microcomputer and ZCT composition loop are simultaneously connected in bus outlet；When earth fault occurs in circuit
When, all protection devices for detecting abnormality share the stable state zero-sequence component data of itself simultaneously by CAN network, and
By route selection principle, most possible earth fault is found out, failure is reliably cut off；The earthing wire-selecting dress based on low current
Put using many protection devices to earth fault when steady state data analysis judge, be effectively prevented because site environment and
The limitation of protecting single device route selection condition, causes the situation of large area malfunction or tripping.
Brief description of the drawings
Fig. 1 is the structural representation of the line-selected earthing device based on low current.
Wherein：1st, voltage transformer；2nd, microcomputer；3rd, ZCT.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only an embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, protection scope of the present invention is belonged to.
To make the purpose, technical scheme and advantage of the application clearer, below in conjunction with drawings and the specific embodiments, to this
Application is described in further detail.
In the following description, the reference to " one embodiment ", " embodiment ", " example ", " example " etc. shows
The embodiment or example so described can include special characteristic, structure, characteristic, property, element or limit, but not each real
Applying example or example all necessarily includes special characteristic, structure, characteristic, property, element or limit.In addition, reuse phrase " according to
One embodiment of the application " is not necessarily referring to identical embodiment although it is possible to refer to phase be the same as Example.
According to one embodiment of the application there is provided a kind of line-selected earthing device based on low current, as shown in figure 1, should
Line-selected earthing device based on low current includes microcomputer 2 and multiple ZCTs 3, and being provided with serial communication on microcomputer 2 connects
Mouthful, ZCT 3 is connected with microcomputer 2 by serial communication interface, is connected in parallel with each other between ZCT 3 in microcomputer 2
On；Voltage transformer 1 is connected with the open delta on microcomputer 2, voltage transformer 1, microcomputer 2 and the composition of ZCT 3 loop
And be connected in bus outlet.
Microcomputer 2 is opened including master control borad, power panel, display module, IR remote controller, external analog amount input terminal, outside
Enter to be integrated with outside intake input terminal, relay output end, CAN communication on control button and warning circuit, master control borad
Terminal, insulaion resistance monitor input terminal；External analog amount input terminal is connected by power panel with master control borad；Display module leads to
Communication cable is crossed with master control borad to be connected；Warning circuit is connected by communication cable with master control borad；Outside is opened to be passed through into control button
Display module is connected with master control borad；IR remote controller is connected by display module with master control borad.
The ZCT 3 of the line-selected earthing device based on low current include Fig. 1 in T1, T2, T3, T4,
T5 ... Tn, and it is parallel with one another；Voltage transformer 1 is connected with the open delta on microcomputer 2, to obtain its residual voltage, zero sequence
Transformer 3 is connected in bus outlet, to obtain zero-sequence current in bus outlet；Voltage transformer 1, microcomputer 2 and zero-sequence mutual inductance
Device 3 constitutes loop and is connected in bus outlet.
When earth fault occurs in circuit, all protection devices for detecting abnormality are shared simultaneously by CAN network
The stable state zero-sequence component data of itself, and by route selection principle, most possible earth fault is found out, reliable excision event
Barrier；The analysis of steady state data judges when the line-selected earthing device based on low current utilizes many protection devices to earth fault,
The limitation because site environment and protecting single device route selection condition is effectively prevented, large area malfunction or tripping is caused
Situation.
According to one embodiment of the application, master control borad is by digital signal processor DSP, ferroelectric memory, sampling electricity
Road, relay group are into relay is made up of protection divide-shut brake relay, guard relay, signal relay；Power panel is by mutual inductance
Device module and power module composition, transformer module is a kind of current-to-voltage converter module；Display module by it is active open into by
Key, indicator lamp, LCD and infrared remote receiver composition.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will make it will be apparent that defined herein one for those skilled in the art
As principle can in other embodiments be realized in the case where not departing from the spirit or scope of invention.Therefore, the present invention will not
It can be limited and the embodiments shown herein, and be to fit to consistent with principles disclosed herein and novel features
Most wide scope.
Claims (2)
1. a kind of line-selected earthing device based on low current, it is characterised in that：Including microcomputer and multiple ZCTs, in microcomputer
On be provided with serial communication interface, ZCT is connected by serial communication interface with microcomputer, between ZCT mutually
It is connected in parallel on microcomputer；Voltage transformer is connected with the open delta on microcomputer, voltage transformer, microcomputer and ZCT
Composition loop is simultaneously connected in bus outlet；The microcomputer includes master control borad, power panel, display module, IR remote controller, outside
Analog input terminal, outside are opened into control button and warning circuit, and outside intake input is integrated with the master control borad
Son, relay output end, CAN communication terminal, insulaion resistance monitor input terminal；The external analog amount input terminal passes through
The power panel is connected with master control borad；The display module is connected by communication cable with the master control borad；The warning circuit
It is connected by communication cable with the master control borad；The outside is opened to be connected into control button by display module with master control borad；Institute
IR remote controller is stated by display module with master control borad to be connected.
2. the line-selected earthing device according to claim 1 based on low current, it is characterised in that：The master control borad is by numeral
Signal processor DSP, ferroelectric memory, sample circuit, relay group are into the relay is by protection divide-shut brake relay, guarantor
Hold relay, signal relay composition；The power panel is made up of transformer module and power module, and the transformer module is
A kind of current-to-voltage converter module；The display module is opened into button, indicator lamp, LCD and infrared remote receiver group by active
Into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710554377.5A CN107290628A (en) | 2017-07-10 | 2017-07-10 | A kind of line-selected earthing device based on low current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710554377.5A CN107290628A (en) | 2017-07-10 | 2017-07-10 | A kind of line-selected earthing device based on low current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107290628A true CN107290628A (en) | 2017-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710554377.5A Pending CN107290628A (en) | 2017-07-10 | 2017-07-10 | A kind of line-selected earthing device based on low current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107290628A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266827Y (en) * | 2008-09-12 | 2009-07-01 | 南京因泰莱电器股份有限公司 | Microcomputer comprehensive protector for mining |
| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| CN104515934A (en) * | 2014-12-22 | 2015-04-15 | 安徽凯川电力保护设备有限公司 | HHT (Hilbert-Huang transform)-based microcomputer small-current earth-fault line selection device |
-
2017
- 2017-07-10 CN CN201710554377.5A patent/CN107290628A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266827Y (en) * | 2008-09-12 | 2009-07-01 | 南京因泰莱电器股份有限公司 | Microcomputer comprehensive protector for mining |
| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| CN104515934A (en) * | 2014-12-22 | 2015-04-15 | 安徽凯川电力保护设备有限公司 | HHT (Hilbert-Huang transform)-based microcomputer small-current earth-fault line selection device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171024 |