CN205724867U - A kind of small current grounding system single-phase grounding selecting protection device - Google Patents
A kind of small current grounding system single-phase grounding selecting protection device Download PDFInfo
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- CN205724867U CN205724867U CN201620643836.8U CN201620643836U CN205724867U CN 205724867 U CN205724867 U CN 205724867U CN 201620643836 U CN201620643836 U CN 201620643836U CN 205724867 U CN205724867 U CN 205724867U
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Abstract
The utility model discloses a kind of small current grounding system single-phase grounding selecting protection device, including data detecting unit and control unit, described data detecting unit includes the first microcontroller and telecommunication circuit, the input of described first microcontroller is connected to A/D change-over circuit, arc light detecting circuit and clock circuit, described control unit includes the second microcontroller, data storage and Ethernet module, the input of described second microcontroller is connected to button operation circuit, the outfan of described second microcontroller is connected to warning circuit, LCDs and relay protection circuit, the input of described A/D change-over circuit is connected to zero sequence voltage detection module and zero-sequence current detection module.This utility model circuit is simple, reasonable in design, determines earth fault line in time and disconnects, and preventing forming short-circuit loop affects load supplying, improves the safety and reliability of small current neutral grounding system, practical.
Description
Technical field
This utility model belongs to single-phase grounding selecting protection device technical field in power system, is specifically related to a kind of little electricity
Stream grounding system single-phase grounding selecting protection device.
Background technology
Power distribution network many employings small current neutral grounding system of China, small current neutral grounding system includes isolated neutral, neutrality
Point is through grounding through arc or through high resistance ground system.In distribution network failure, it mostly is singlephase earth fault, supplies in operating mode enterprise
In electricity system, requirements at the higher level are proposed power supply reliability.During small current neutral grounding system generation singlephase earth fault, healthy phases electricity
Pressure raises, and line insulation requires height；Meanwhile, process if faulty line can not be determined in time to complete faulty line, easily expand
Greatly two-phase or multiphase shorted to earth, threatens the safe operation of power system.Even there will be intermittent arc overvoltage, easily
Cause insulation breakdown, equipment time serious, can be punctured, cause phase fault, accidents caused expansion.Singlephase earth fault is power distribution network
The fault that occurrence probability is most, when fault occurs, it is necessary to failure judgement branch road accurately, i.e. route selection；And excise fault branch.Mesh
Before, for the process of singlephase earth fault, need manually to judge and it needs to manually fix a breakdown.Therefore, nowadays lack
A kind of simple in construction, low cost, small current grounding system single-phase grounding selecting protection device reasonable in design, easy-operating, pass through
Zero sequence voltage detection module is set and zero-sequence current detection module detects residual voltage and zero-sequence current in real time, determine earth fault
Circuit, and give selective ablation, to guarantee to be formed without short-circuit loop, do not affect load supplying, by arranging arc light detecting electricity
Arc light is detected on road in real time, by relay protection circuit timely open failure circuit, it is to avoid send out the expansion of accident, improves small area analysis
The safety and reliability of earthed system.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, it is provided that a kind of little electricity
Stream grounding system single-phase grounding selecting protection device, this utility model design circuit is simple, reasonable in design, by arranging zero sequence electricity
Pressure detection module and zero-sequence current detection module, detection residual voltage and zero-sequence current, determine earth fault line, prevent in real time
Form short-circuit loop and affect load supplying, detect arc light in real time by arranging arc light detecting circuit, pass through relay protection circuit
Open failure circuit in time, it is to avoid send out the expansion of accident, improves the safety and reliability of small current neutral grounding system, practicality
By force, it is simple to promote the use of.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is: a kind of small current neutral grounding system is single-phase
Selective grounding protection device, it is characterised in that: include data detecting unit and the control list being connected with described data detecting unit
Unit, described data detecting unit includes the first microcontroller and the telecommunication circuit connected with the first microcontroller, described first micro-
The input of controller is connected to A/D change-over circuit, arc light detecting circuit and clock circuit, and described control unit includes the second micro-control
Device processed and the data storage connected with the second microcontroller and for the Ethernet module communicated with host computer, described
The input of the second microcontroller is connected to button operation circuit, and the outfan of described second microcontroller is connected to warning circuit, liquid
Crystal display screen and relay protection circuit, described first microcontroller carries out data by telecommunication circuit and the second microcontroller and leads to
Letter, the input of described A/D change-over circuit is connected to zero sequence voltage detection module and zero-sequence current detection module, described residual voltage
Detection module includes voltage transformer and the first signal conditioning circuit connected with voltage transformer outfan, described zero-sequence current
Detection module includes current transformer and the secondary signal modulate circuit connected with current transformer outfan, described first signal
The outfan of modulate circuit and the outfan of secondary signal modulate circuit all inputs with A/D change-over circuit connect；
Described first signal conditioning circuit includes that amplifier U1 and amplifier U2, the in-phase input end of described amplifier U1 divide two-way,
One tunnel connects with one end of resistance R4, and another road is through electric capacity C6 ground connection；The other end of described resistance R4 divides two-way, and a road is through electric capacity
C4 ground connection, another road connects with the signal output part of voltage transformer through resistance R3；The outfan of described amplifier U1 divides two-way, and one
Road connects with the inverting input of described amplifier U1, and another road connects with one end of resistance R5；The other end of described resistance R5 divides
Two-way, a road connects through resistance R1 and 3.3V power output end, and another road connects with the in-phase input end of amplifier U2；Described amplifier
The outfan of U2 divides two-way, and a road connects with the inverting input of described amplifier U2, and another road connects with one end of resistance R2；Institute
The other end stating resistance R2 divides three tunnels, and a road connects with the negative electrode of Zener diode DW1 through electric capacity C5 ground connection, another road, and the 3rd
Road connects with the input of A/D change-over circuit.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described secondary signal
Modulate circuit includes that amplifier U3 and amplifier U4, the in-phase input end of described amplifier U3 divide two-way, one end phase of a road and resistance R11
Connecing, another road is through electric capacity C13 ground connection；The other end of described resistance R11 divides two-way, and a road is through electric capacity C11 ground connection, another Lu Yu electricity
One end of resistance R10 connects, and the other end of described resistance R10 divides two-way, and a road is through resistance R13 ground connection, another road and Current Mutual Inductance
The signal output part of device connects；The outfan of described amplifier U3 divides two-way, and a road connects with the inverting input of described amplifier U3,
Another road connects with one end of resistance R12；The other end of described resistance R12 divides two-way, and a road is defeated through resistance R8 and 3.3V power supply
Going out end to connect, another road connects with the in-phase input end of amplifier U4；The outfan of described amplifier U4 divides two-way, a road and described fortune
The inverting input putting U4 connects, and another road connects with one end of resistance R9；The other end of described resistance R9 divides three tunnels, a road warp
Electric capacity C12 ground connection, another road connects with the negative electrode of Zener diode DW2, and the 3rd tunnel connects with the input of A/D change-over circuit.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described mutual induction of voltage
Device includes that sensor ZMPT101B, described current transformer include sensors A CS712ELC-20A.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described arc light detecting
Circuit includes silicon photoelectric diode PD1 and audion Q2, the negative electrode of described silicon photoelectric diode PD1 and+5V power output end phase
Connecing, the anode of described silicon photoelectric diode PD1 divides two-way, a road through resistance R16 ground connection, the base stage phase of another road and audion Q2
Connect；The colelctor electrode of described audion Q2 divides two-way, and a road connects through resistance R14 and+5V power output end, and another road is micro-with first
Controller connects；The grounded emitter of described audion Q2.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described A/D changes electricity
Road includes chip MAX125.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described relay is protected
Protection circuit includes that relay K 1 and audion Q1, the base stage of described audion Q1 connect through resistance R15 and the second microcontroller, institute
The emitter stage stating audion Q1 connects with+5V power output end, and the colelctor electrode of described audion Q1 divides three tunnels, and a road is through electric capacity
C14 ground connection, another road connects with the anode of commutation diode D1, and the 3rd tunnel connects with one end of the coil of relay K 1；Described
The other end of the coil of relay K 1 and the equal ground connection of negative electrode of commutation diode D1.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described telecommunication circuit
For RS232 serial communication circuit.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described clock circuit
Including chip DS1302.
Above-mentioned a kind of small current grounding system single-phase grounding selecting protection device, it is characterised in that: described first micro-control
Device processed is DSP microcontroller, and described second microcontroller is ARM microcontroller.
This utility model compared with prior art has the advantage that
1, this utility model is by arranging zero sequence voltage detection module and zero-sequence current detection module, detects in real time and gathers
Residual voltage signal in small current neutral grounding system and zero sequence current signal, when there is singlephase earth fault, determine ground connection event
Barrier circuit, and give selective ablation, prevent short-circuit loop from affecting load supplying.
2, this utility model is by arranging arc light detecting circuit, and the arc light in detection small current neutral grounding system, works as inspection in real time
When measuring arc light, and by relay protection circuit, timely disengagement failure circuit, it is to avoid send out the expansion of accident, improve small area analysis
The safety and reliability of earthed system.
3, this utility model is responsible for the data such as zero-sequence current, residual voltage and arc optical signal by arranging the first microcontroller
Gather, and by telecommunication circuit, the zero-sequence current collected, residual voltage and arc optical signal data are sent to the second microcontroller
Device, the second microcontroller is responsible for the process of data, is shown in real time by LCDs, synchronizes to store to data storage
In, the parameter not meeting setting value is passed through warning circuit alarm, and by Ethernet module and host computer number
According to communication, facilitate the staff's remote monitor in Control Room.
In sum, this utility model circuit is simple, reasonable in design, by arranging zero sequence voltage detection module and zero sequence electricity
Stream detection module, detection residual voltage and zero-sequence current, determine earth fault line in real time, prevents forming short-circuit loop impact negative
Carry power supply, detect arc light in real time by arranging arc light detecting circuit, by relay protection circuit timely open failure circuit, keep away
Exempt from the expansion of accident of sending out, improve the safety and reliability of small current neutral grounding system, practical, it is simple to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of this utility model the first signal conditioning circuit.
Fig. 3 is the circuit theory diagrams of this utility model secondary signal modulate circuit.
Fig. 4 is the circuit theory diagrams of this utility model arc light detecting circuit.
Fig. 5 is the circuit theory diagrams of this utility model relay protection circuit.
Description of reference numerals:
1 first microcontroller；2 voltage transformers；3 first signal conditioning circuits；
4 A/D change-over circuits；5 current transformers；6 secondary signal modulate circuits；
7 arc light detecting circuit；8 clock circuits；9 telecommunication circuits；
10 button operation circuit；11 data storages；12 LCDs；
13 second microcontrollers；14 warning circuits；15 relay protection circuits；
16 Ethernet modules；17 host computers.
Detailed description of the invention
As it is shown in figure 1, this utility model includes data detecting unit and the control list being connected with described data detecting unit
Unit, described data detecting unit includes the first microcontroller 1 and the telecommunication circuit 9 connected with the first microcontroller 1, described first
The input of microcontroller 1 is connected to A/D change-over circuit 4, arc light detecting circuit 7 and clock circuit 8, and described control unit includes
Two microcontrollers 13 and the data storage 11 connected with the second microcontroller 13 and for communicating with host computer 17
Ethernet module 16, the input of described second microcontroller 13 is connected to button operation circuit 10, described second microcontroller
The outfan of 13 is connected to warning circuit 14, LCDs 12 and relay protection circuit 15, and described first microcontroller 1 passes through
Telecommunication circuit 9 and the second microcontroller 13 carry out data communication, and the input of described A/D change-over circuit 4 is connected to residual voltage inspection
Surveying module and zero-sequence current detection module, described zero sequence voltage detection module includes voltage transformer 2 and defeated with voltage transformer 2
Going out the first signal conditioning circuit 3 that end connects, described zero-sequence current detection module includes current transformer 5 and and current transformer
The secondary signal modulate circuit 6 that 5 outfans connect, the outfan of described first signal conditioning circuit 3 and secondary signal conditioning electricity
The outfan on road 6 all inputs with A/D change-over circuit 4 connect.
As in figure 2 it is shown, described first signal conditioning circuit 3 includes amplifier U1 and amplifier U2, the homophase of described amplifier U1 is defeated
Entering end point two-way, a road connects with one end of resistance R4, and another road is through electric capacity C6 ground connection；The other end of described resistance R4 divides two
Road, a road connects through the signal output part of resistance R3 with voltage transformer 2 through electric capacity C4 ground connection, another road；Described amplifier U1
Outfan divides two-way, and a road connects with the inverting input of described amplifier U1, and another road connects with one end of resistance R5；Described electricity
The other end of resistance R5 divides two-way, and a road connects through resistance R1 and 3.3V power output end, and another road inputs with the homophase of amplifier U2
End connects；The outfan of described amplifier U2 divides two-way, and a road connects with the inverting input of described amplifier U2, another road and resistance
One end of R2 connects；The other end of described resistance R2 divides three tunnels, and a road is through electric capacity C5 ground connection, another road and Zener diode DW1
Negative electrode connect, the 3rd tunnel connects with the input of A/D change-over circuit 4.
As it is shown on figure 3, in the present embodiment, described secondary signal modulate circuit 6 includes amplifier U3 and amplifier U4, described amplifier
The in-phase input end of U3 divides two-way, and a road connects with one end of resistance R11, and another road is through electric capacity C13 ground connection；Described resistance R11
The other end divide two-way, a road connects with one end of resistance R10 through electric capacity C11 ground connection, another road, another of described resistance R10
End point two-way, a road connects with the signal output part of current transformer 5 through resistance R13 ground connection, another road；Described amplifier U3 defeated
Going out end point two-way, a road connects with the inverting input of described amplifier U3, and another road connects with one end of resistance R12；Described electricity
The other end of resistance R12 divides two-way, and a road connects through resistance R8 and 3.3V power output end, and another road inputs with the homophase of amplifier U4
End connects；The outfan of described amplifier U4 divides two-way, and a road connects with the inverting input of described amplifier U4, another road and resistance
One end of R9 connects；The other end of described resistance R9 divides three tunnels, and a road is through electric capacity C12 ground connection, another road and Zener diode DW2
Negative electrode connect, the 3rd tunnel connects with the input of A/D change-over circuit 4.
In the present embodiment, described voltage transformer 2 includes that sensor ZMPT101B, described current transformer 5 include sensing
Device ACS712ELC-20A.
As shown in Figure 4, in the present embodiment, described arc light detecting circuit 7 includes silicon photoelectric diode PD1 and audion Q2,
The negative electrode of described silicon photoelectric diode PD1 connects with+5V power output end, and the anode of described silicon photoelectric diode PD1 divides two-way,
One tunnel connects with the base stage of audion Q2 through resistance R16 ground connection, another road；The colelctor electrode of described audion Q2 divides two-way, a road
Connecting through resistance R14 and+5V power output end, another road connects with the first microcontroller 1；The emitter stage of described audion Q2 connects
Ground.
In the present embodiment, described A/D change-over circuit 4 includes chip MAX125.
As it is shown in figure 5, in the present embodiment, described relay protection circuit 15 includes relay K 1 and audion Q1, described
The base stage of audion Q1 connects through resistance R15 and the second microcontroller 13, and the emitter stage of described audion Q1 exports with+5V power supply
End connects, and the colelctor electrode of described audion Q1 divides three tunnels, and a road is through the sun of electric capacity C14 ground connection, another road and commutation diode D1
Pole connects, and the 3rd tunnel connects with one end of the coil of relay K 1；The other end of the coil of described relay K 1 and rectification two pole
The equal ground connection of negative electrode of pipe D1.
In the present embodiment, described telecommunication circuit 9 is RS232 serial communication circuit.
In the present embodiment, described clock circuit 8 includes chip DS1302.
In the present embodiment, described first microcontroller 1 is DSP microcontroller, and described second microcontroller 13 is ARM micro-control
Device processed.
When this utility model uses, the first microcontroller 1 and the second microcontroller 13 are entered duty, are grasped by button
Making circuit 10 and preset residual voltage threshold value and zero-sequence current threshold value, voltage transformer 2 detects small current neutral grounding system in real time
In residual voltage signal and the residual voltage signal collected is sent into the first signal conditioning circuit 3, through first signal adjust
The process of reason circuit 3 is converted to the accessible numerical range of A/D change-over circuit 4, and current transformer 5 detects small current neutral grounding in real time
Zero sequence current signal in system the zero sequence current signal that will collect send into secondary signal modulate circuit 6, through the second letter
The process of number modulate circuit 6 is converted to the accessible numerical range of A/D change-over circuit 4, and the process through A/D change-over circuit 4 turns
Turning to digital zero sequence voltage value and numeral zero-sequence current value and send to the first microcontroller 1, arc light detecting circuit 7 detects in real time
Whether there is arc optical signal in small current neutral grounding system, when there is arc light, silicon photoelectric diode PD1 reverse current increases, and three
Pole pipe Q2 turns on, and arc light detecting circuit 7 output low level also sends to the first microcontroller 1, clock circuit 8 real time record zero sequence
The acquisition time of voltage signal, zero sequence current signal and arc optical signal, conveniently checks, the number that the first microcontroller 1 will receive
Word residual voltage value, numeral zero sequence current value and there is arc optical signal and sent to the second microcontroller 13 by telecommunication circuit 9, the
Two microcontrollers 13 by the digital zero sequence voltage value that receives and numeral zero-sequence current value respectively with residual voltage set in advance
Threshold value and zero-sequence current threshold value compare, and are shown in real time by LCDs 12 and synchronize to store to data storage 11
In, the digital zero sequence voltage value received when the second microcontroller 13 does not meets residual voltage threshold value set in advance or second micro-
When the digital zero sequence current value that controller 13 receives does not meets zero-sequence current threshold value set in advance, the second microcontroller 13 leads to
Crossing warning circuit 14 alarm, meanwhile, the second microcontroller 13 is according to the digital zero sequence voltage value obtained and numeral zero sequence electricity
Flow valuve determines earth fault line, to guarantee that being formed without short-circuit loop affects load supplying, deposits when the second microcontroller 13 determines
When single-phase fault or in the presence of arc light detecting circuit 7 detects arc light, the second microcontroller 13 controls relay protection circuit
15 work, the normally-closed contact of relay K 1 disconnects, open failure circuit, the expansion of Accident prevention；Second microcontroller 13 also leads to
The host computer 17 crossing Ethernet module 16 and be arranged in Control Room carries out data communication, facilitates the remote prison of staff
Control, simple to operate, improve the safety and reliability of small current neutral grounding system.
The above, be only preferred embodiment of the present utility model, not impose any restrictions this utility model, every
Any simple modification, change and equivalent structure change above example made according to this utility model technical spirit, the most still
Belong in the protection domain of technical solutions of the utility model.
Claims (9)
1. a small current grounding system single-phase grounding selecting protection device, it is characterised in that: include data detecting unit and with
The control unit that described data detecting unit connects, described data detecting unit includes the first microcontroller (1) and micro-with first
The telecommunication circuit (9) that controller (1) connects, the input of described first microcontroller (1) is connected to A/D change-over circuit (4), arc light
Testing circuit (7) and clock circuit (8), described control unit include the second microcontroller (13) and with the second microcontroller (13)
The data storage (11) that connects and for the Ethernet module (16) communicated with host computer (17), described second micro-control
The input of device processed (13) is connected to button operation circuit (10), and the outfan of described second microcontroller (13) is connected to warning circuit
(14), LCDs (12) and relay protection circuit (15), described first microcontroller (1) by telecommunication circuit (9) with
Second microcontroller (13) carries out data communication, the input of described A/D change-over circuit (4) be connected to zero sequence voltage detection module and
Zero-sequence current detection module, described zero sequence voltage detection module include voltage transformer (2) and with voltage transformer (2) outfan
The first signal conditioning circuit (3) connected, described zero-sequence current detection module includes current transformer (5) and and current transformer
(5) the secondary signal modulate circuit (6) that outfan connects, the outfan of described first signal conditioning circuit (3) and secondary signal
The outfan of modulate circuit (6) all inputs with A/D change-over circuit (4) connect；
Described first signal conditioning circuit (3) includes that amplifier U1 and amplifier U2, the in-phase input end of described amplifier U1 divide two-way, one
Road connects with one end of resistance R4, and another road is through electric capacity C6 ground connection；The other end of described resistance R4 divides two-way, and a road is through electric capacity C4
Ground connection, another road connects through the signal output part of resistance R3 with voltage transformer (2)；The outfan of described amplifier U1 divides two-way,
One tunnel connects with the inverting input of described amplifier U1, and another road connects with one end of resistance R5；The other end of described resistance R5
Dividing two-way, a road connects through resistance R1 and 3.3V power output end, and another road connects with the in-phase input end of amplifier U2；Described fortune
The outfan putting U2 divides two-way, and a road connects with the inverting input of described amplifier U2, and another road connects with one end of resistance R2；
The other end of described resistance R2 divides three tunnels, and a road connects with the negative electrode of Zener diode DW1 through electric capacity C5 ground connection, another road, the
Three tunnels connect with the input of A/D change-over circuit (4).
2. according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1, it is characterised in that: institute
State secondary signal modulate circuit (6) and include that amplifier U3 and amplifier U4, the in-phase input end of described amplifier U3 divide two-way, a road and electricity
One end of resistance R11 connects, and another road is through electric capacity C13 ground connection；The other end of described resistance R11 divides two-way, and a road connects through electric capacity C11
Ground, another road connects with one end of resistance R10, and the other end of described resistance R10 divides two-way, a road through resistance R13 ground connection, another
Road connects with the signal output part of current transformer (5)；The outfan of described amplifier U3 divides two-way, a road and described amplifier U3
Inverting input connects, and another road connects with one end of resistance R12；The other end of described resistance R12 divides two-way, and a road is through resistance
R8 with 3.3V power output end connects, and another road connects with the in-phase input end of amplifier U4；The outfan of described amplifier U4 divides two
Road, a road connects with the inverting input of described amplifier U4, and another road connects with one end of resistance R9；Another of described resistance R9
Duan Fen tri-tunnel, a road connects with the negative electrode of Zener diode DW2 through electric capacity C12 ground connection, another road, the 3rd tunnel and A/D conversion electricity
The input on road (4) connects.
3., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described voltage transformer (2) includes that sensor ZMPT101B, described current transformer (5) include sensors A CS712ELC-
20A。
4., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described arc light detecting circuit (7) includes silicon photoelectric diode PD1 and audion Q2, the negative electrode of described silicon photoelectric diode PD1
Connecting with+5V power output end, the anode of described silicon photoelectric diode PD1 divides two-way, and a road is through resistance R16 ground connection, another road
Connect with the base stage of audion Q2；The colelctor electrode of described audion Q2 divides two-way, and a road is through resistance R14 and+5V power output end
Connecting, another road connects with the first microcontroller (1)；The grounded emitter of described audion Q2.
5., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described A/D change-over circuit (4) includes chip MAX125.
6., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described relay protection circuit (15) includes relay K 1 and audion Q1, the base stage of described audion Q1 through resistance R15 with
Second microcontroller (13) connects, and the emitter stage of described audion Q1 connects with+5V power output end, the collection of described audion Q1
Electrode divides three tunnels, and a road connects with the anode of commutation diode D1 through electric capacity C14 ground connection, another road, the 3rd tunnel and relay K 1
One end of coil connect；The other end of the coil of described relay K 1 and the equal ground connection of negative electrode of commutation diode D1.
7., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described telecommunication circuit (9) is RS232 serial communication circuit.
8., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described clock circuit (8) includes chip DS1302.
9., according to a kind of small current grounding system single-phase grounding selecting protection device described in claim 1 or 2, its feature exists
In: described first microcontroller (1) is DSP microcontroller, and described second microcontroller (13) is ARM microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620643836.8U CN205724867U (en) | 2016-06-24 | 2016-06-24 | A kind of small current grounding system single-phase grounding selecting protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620643836.8U CN205724867U (en) | 2016-06-24 | 2016-06-24 | A kind of small current grounding system single-phase grounding selecting protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205724867U true CN205724867U (en) | 2016-11-23 |
Family
ID=57317460
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620643836.8U Expired - Fee Related CN205724867U (en) | 2016-06-24 | 2016-06-24 | A kind of small current grounding system single-phase grounding selecting protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208594A (en) * | 2019-07-08 | 2019-09-06 | 成都通用整流电器研究所 | A kind of protector circuit protection detection system |
| CN110794326A (en) * | 2019-09-26 | 2020-02-14 | 昆明理工大学 | Line selection method, device and system for short-circuit protection of power distribution system |
-
2016
- 2016-06-24 CN CN201620643836.8U patent/CN205724867U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208594A (en) * | 2019-07-08 | 2019-09-06 | 成都通用整流电器研究所 | A kind of protector circuit protection detection system |
| CN110794326A (en) * | 2019-09-26 | 2020-02-14 | 昆明理工大学 | Line selection method, device and system for short-circuit protection of power distribution system |
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