CN104133152B - DC detecting device during single-phase earthing of small current earthing system - Google Patents
DC detecting device during single-phase earthing of small current earthing system Download PDFInfo
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- CN104133152B CN104133152B CN201410396988.8A CN201410396988A CN104133152B CN 104133152 B CN104133152 B CN 104133152B CN 201410396988 A CN201410396988 A CN 201410396988A CN 104133152 B CN104133152 B CN 104133152B
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Abstract
DC detecting device during single-phase earthing of small current earthing system of the present invention,It is related to small current neutral grounding detection technique field,It is to apply the automatic detection that DC low-voltage power supply carries out singlephase earth fault to high voltage supply online circuit,Avoid the influence of capacitance current,When arbitrarily power supply circuit earth fault occurs all the way,Voltage transformer cabinet PT star winding Y0 of voltage transformer can disequilibrium,Make the angular winding KV both end voltages relay KVJ adhesives of voltage transformer secondary opening,Start automatic detection,Hall sensor H1,Hall sensor Hn,Hall sensor H,Hall sensor H0 sends signal entering signal conversion process circuit XB,Enter microprocessor system CPU after being determined by signal conversion process circuit XB and carry out fault current detection analysis,Oscillograph SBQ is the waveform at detection resistance R1 both ends.Present invention offer is a kind of to meet safety requirements, clear principle, safe and reliable, the accurate single-phase grounded malfunction in grounded system of low current of detection automatic detection device, can be widely used for electric power system.
Description
Technical field：
The present invention relates to direct current during small current neutral grounding detection technique field, particularly single-phase earthing of small current earthing system to examine
Survey device.
Background technology：
Small current neutral grounding system is widely used in electric power system, though system single-phase-to-ground current is little, longtime running easily draws
Line to line fault is played, arc discharge can cause system overvoltage, very harmful to power network, it is necessary to accurately select faulty line simultaneously as early as possible
Cut off it.But the zero-sequence current Small Electric Current Earthing And Routing Device used for a long time is because of the uncertainty of capacitance current, choosing
Line effect is undesirable, can even report by mistake sometimes, and it is greatly passive to be caused to production.
The content of the invention：
The purpose of the present invention is to be directed to drawbacks described above, avoids the influence of capacitance current, changes zero-sequence current route selection dress
The deficiency put, it is to apply the automatic detection that DC low-voltage power supply carries out singlephase earth fault to high voltage supply online circuit, mesh
Be to provide one kind meet safety requirements, clear principle, safe and reliable, the accurate single-phase earthing of small current earthing system of detection therefore
The automatic detection device of barrier.
The technical scheme is that single-phase earthing of small current earthing system DC detecting device, including direct current are powered online
Circuit and single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit and AC control circuit and microprocessor system and show
Ripple device display system, the online power supply circuit of direct current are that high voltage supply online circuit is connected to apply DC low-voltage power supply progress list
The automatic detection of phase earth fault, single-phase earthing signal acquisition circuit are after the control of multichannel high-voltage power supply circuit disconnecting switch
Hall sensor is put on circuit, obtains single-phase earthing signal entering signal conversion process circuit XB, voltage transformer cabinet circuit
Star winding Y0 neutral point of voltage transformer connect mutual induction of voltage with voltage transformer secondary star winding y0 neutral points
The secondary angular winding KV one end of opening of device, forms voltage transformer common port V0 in voltage transformer cabinet PT, AC control circuit
It is that power firestreak L connects binding post by control power circuit breaker DK controls with time relay KT delay disconnection normally-closed contacts
By control power circuit breaker DK control connection binding post N0, microprocessor system is to believe single-phase earthing by L1, zero-power line N
Number obtaining the ground signalling that circuit and voltage transformer cabinet circuit are measured is sent to microprocessor system, by microprocessor system
The position of CPU processing display ground connection, Hall sensor H1 and Hall sensor Hn signal end are connected to signal conversion process electricity
Road XB, oscilloscope display system can directly observe line-to-ground situation, apply it is characterized in that being connected to high voltage supply online circuit
DC low-voltage power supply carries out the automatic detection of singlephase earth fault, avoids the influence of capacitance current, direct current supplies online
Circuit is made up of fuse, monopole vacuum contactor, bridge rectifier, dc source transformer, resistance, is high pressure A phases electricity
Source bus a connection fuse RDa1, high pressure B phase power source bus b connection fuse RDb1, high pressure C phase power source bus c connection fuse
Device RDc1, fuse the RDa1 other end connection monopole vacuum contactor KMa normally opened stationary contact, the fuse RDb1 other ends connect
Order pole vacuum contactor KMb normally opened stationary contact, fuse RDc1 other ends connection monopole vacuum contactor KMc's is normally opened
Stationary contact, monopole vacuum contactor KMa normally opened moving contact end connection current-limiting resistance Ra, monopole vacuum contactor KMb's is normal
Start contact end connection current-limiting resistance Rb, monopole vacuum contactor KMc normally opened moving contact end connection current-limiting resistance Rc, current limliting electricity
Resistance Ra and current-limiting resistance Rb and current-limiting resistance the Rc other end connect bridge rectifier Z positive electricity source output terminal together, and bridge-type is whole
Device Z negative electricity source output terminal connection resistance R1 is flowed, resistance R1 other ends connection ground wire E0 and resistance R2 and relay J1 is normally closed to be touched
The other end connection voltage transformer cabinet PT voltage transformer first winding stars Y0 of point, resistance R2 and relay J1 normally-closed contacts
Neutral point, dc source transformer TB secondary windings connection bridge rectifier Z ac input end, at the beginning of dc source transformer TB
Level winding is sleeved on ground wire E0 and electricity by auxiliary reclay J1 normally opened contacts control connection AC power, Hall sensor H
Hinder on the connecting line between R1, Hall sensor H0 is sleeved on resistance R1 connection resistance R2 ground wire E0.
Described single-phase earthing of small current earthing system DC detecting device, including voltage transformer cabinet circuit, its feature
It is star winding Y0 neutral point of voltage transformer and voltage transformer secondary star winding of voltage transformer cabinet circuit
The angular winding KV one end of y0 neutral points connection voltage transformer secondary opening, it is public to form voltage transformer in voltage transformer cabinet PT
V0 is held altogether, is that high pressure A phase power source bus a and high pressure B phase power source bus b and high pressure C phase power source bus c are connected to and kept apart
On the static contact for closing QF1, disconnecting switch GK three-phase moving contacts end connects three of star winding Y0 of voltage transformer respectively
Head, star winding Y0 of voltage transformer neutral point connect voltage transformer common port V0 in voltage transformer cabinet PT, electricity
The secondary star winding y0 of pressure transformer three heads connect fuse RDa2 and fuse RDb2 and fuse RDc2, voltage respectively
Voltage transformer common port V0, fuse RDa2 in the secondary star winding y0 of transformer neutral point connection voltage transformer cabinet PT
The other end connection A phase voltage Table V a and resistance R3 and auxiliary reclay J normally-closed contact, resistance R3 the other end and it is middle after
The other end connection auxiliary reclay KA, fuse RDb2 of electrical equipment J normally-closed contacts other end connection B phase voltage Table V b and resistance
R4 and auxiliary reclay J normally-closed contact, the resistance R4 other end connect centre with the other end of auxiliary reclay J normally-closed contacts
Relay KB, fuse RDc2 other end connection C phase voltage Table V c and resistance R5 and auxiliary reclay J normally-closed contact, electricity
The resistance R5 other end connects auxiliary reclay KC with the other end of auxiliary reclay J normally-closed contacts, and auxiliary reclay KA's is another
End and the auxiliary reclay KB other end and the auxiliary reclay KC other end all connect mutual induction of voltage in voltage transformer cabinet PT
Device common port V0, the A phase voltage Table V a other end and the B phase voltage Table V b other end and C phase voltage Table V the c other end all connect
Connect voltage transformer common port V0 in voltage transformer cabinet PT, the angular winding KV of voltage transformer secondary opening one end connection electricity
Press voltage transformer common port V0 and voltage relay KVJ, the angular winding KV of voltage transformer secondary opening in transformer cabinet PT
Other end connection voltage relay KVJ the other end.
Described single-phase earthing of small current earthing system DC detecting device, including AC control circuit, it is characterised in that
AC control circuit be power firestreak L by control power circuit breaker DK control connection control power supply indicator XD1 and time after
Electrical equipment KT delays disconnect normally-closed contact, the other end connection binding post L1 of the normally closed delay break contacts of time relay KT, electricity
Source zero line N connects binding post N0, control power supply indicator XD1 other end connection electricity by the DK controls of control power circuit breaker
Hinder R6, resistance R6 other end connection binding post N0, binding post L1 Connection Time relay KT normally opened contacts and it is middle after
Electrical equipment Ja normally opened contacts and auxiliary reclay Jb normally opened contacts and one end of auxiliary reclay Jc normally opened contacts parallel connection, time relay
Device KT normally opened contacts and auxiliary reclay Ja normally opened contacts and auxiliary reclay Jb normally opened contacts and auxiliary reclay Jc are normally opened tactile
Point other end connection in parallel carries out detecting indicator lamp XD2 and time relay KT and auxiliary reclay J1, carries out detection instruction
Lamp the XD2 other end connection resistance R7, resistance the R7 other end connection binding post N0, the time relay KT other end connection
Binding post N0, auxiliary reclay the J1 other end connection binding post N0, binding post L1 connection voltage relays KVJ are normally opened
Contact, the other end connection auxiliary reclay KA normally-closed contacts and auxiliary reclay KB of voltage relay KVJ normally opened contacts are normally closed
Contact and auxiliary reclay KC normally-closed contacts and auxiliary reclay J, the other end connection of auxiliary reclay KA normally-closed contacts are middle
Relay KA1, the other end connection auxiliary reclay KB1 of auxiliary reclay KB normally-closed contacts, auxiliary reclay KC normally-closed contacts
The other end connection auxiliary reclay KC1, auxiliary reclay KA1 the other end connection binding post N0, auxiliary reclay KB1's
The other end connects binding post N0, auxiliary reclay KC1 other end connection binding post N0, the auxiliary reclay J other end
Connect binding post N0, binding post L1 connections auxiliary reclay KA1 normally opened contacts and auxiliary reclay Ja normally opened contacts and examination
Button SBa is tested, the other end and the other end of auxiliary reclay Ja normally opened contacts of auxiliary reclay KA1 normally opened contacts and experiment are pressed
The button SBa other end all connects auxiliary reclay Jb normally-closed contacts, auxiliary reclay Jb normally-closed contacts and auxiliary reclay together
Monopole vacuum contactor KMa is connected after the series connection of Jc normally-closed contacts and auxiliary reclay Ja and A phase grounded signal lamp XDa, monopole are true
Empty contactor KMa other end connection resistance R8 and auxiliary reclay Ja normally-closed contacts, resistance R8 and auxiliary reclay Ja is normally closed
Binding post N0, auxiliary reclay Ja other end connection binding post N0, A phase grounded signal lamp XDa are connected after contact shunt
The other end connection resistance R9, resistance R9 other end connection binding post N0, binding post L1 connection auxiliary reclays KB1 is normal
Open contact and auxiliary reclay Jb normally opened contacts and test button SBb, the other end of auxiliary reclay KB1 normally opened contacts and centre
The other end of relay Jb normally opened contacts and the test button SBb other end all connect auxiliary reclay Ja normally-closed contacts together,
Auxiliary reclay Ja normally-closed contacts and auxiliary reclay Jc normally-closed contacts series connection after connect monopole vacuum contactor KMb and centre after
Electrical equipment Jb and B phase grounded signal lamp XDb, monopole vacuum contactor KMb other end connection resistance R10 and auxiliary reclay Jb are normal
Binding post N0, the auxiliary reclay Jb other end are connected after closed contact, resistance R10 and auxiliary reclay Jb normally-closed contact parallel connections
Connect binding post N0, B phase grounded signal lamp the XDb other end connection resistance R11, resistance R11 other end connection terminals
Sub- N0, binding post L1 connection auxiliary reclay KC1 normally opened contacts and auxiliary reclay Jc normally opened contacts and test button SBc,
The other end of auxiliary reclay KC1 normally opened contacts and the other end of auxiliary reclay Jc normally opened contacts and test button SBc it is another
One end all connects auxiliary reclay Ja normally-closed contacts, auxiliary reclay Ja normally-closed contacts and auxiliary reclay Jb normally-closed contacts together
Monopole vacuum contactor KMc and auxiliary reclay Jc and C phase grounded signal lamp XDc, monopole vacuum contactor KMc are connected after series connection
Other end connection resistance R12 and auxiliary reclay Jc normally-closed contacts, resistance R12 and auxiliary reclay Jc normally-closed contact parallel connections after
Binding post N0 is connected, auxiliary reclay Jc other end connection binding post N0, the C phase grounded signal lamp XDc other end connects
Connecting resistance R13, resistance R13 other end connection binding post N0.
Described single-phase earthing of small current earthing system DC detecting device, including microprocessor system, it is characterised in that
Microprocessor system is that the ground signalling that single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit are measured is sent into microcomputer
Processing system, the letter at the position of display ground connection, Hall sensor H1 and Hall sensor Hn is handled by microprocessor system CPU
Number end be connected to signal conversion process circuit XB, Hall sensor H and Hall sensor H0 signal end be connected to signal conversion
Process circuit XB, auxiliary reclay KA normally opened contacts and auxiliary reclay KB normally opened contacts and auxiliary reclay KC normally opened contacts
Action signal is connected to signal conversion process circuit XB, shows by signal conversion process circuit XB into microprocessor system CPU
Show the position of earth fault, communication interface TX is communication interface.
Described single-phase earthing of small current earthing system DC detecting device, including oscilloscope display system, its feature exist
Line-to-ground situation can be directly observed in oscilloscope display system, oscillograph SBQ measurement lines are connected to resistance R1 both ends.
The present invention is to apply the automatic inspection that DC low-voltage power supply carries out singlephase earth fault to high voltage supply online circuit
Survey, avoid the influence of capacitance current, change the deficiency of zero-sequence current line selection apparatus, the present invention provides one kind and meets that safety will
Ask, clear principle, safe and reliable, the accurate single-phase grounded malfunction in grounded system of low current of detection automatic detection device, can be wide
It is general to be used for electric power system.
Brief description of the drawings
Fig. 1 single-phase earthing of small current earthing system DC detecting device main circuit control circuit schematic diagrams
Fig. 2 single-phase earthing of small current earthing system DC detecting device control relay circuit schematic diagrams
A high pressures A phases power source bus in figure, b high pressure B phases power source bus, c high pressure C phases power source bus, RDa1 fuses,
RDb1 fuses, RDc1 fuses, RDa2 fuses, RDb2 fuses, RDc2 fuses, Ra current-limiting resistances, Rb current-limiting resistances,
Rc current-limiting resistances, R1-R13 resistance, Z bridge rectifiers, TB dc sources transformer, GK disconnecting switch, QF1 disconnecting switch, QFn
Disconnecting switch, H Hall sensors, H0 Hall sensors, H1 Hall sensors, Hn Hall sensors, PT voltage transformer cabinets, Y0
Star winding of voltage transformer, y0 voltage transformer secondaries star winding, the angular winding of KV voltage transformer secondary openings,
V0 voltage transformers common port, J auxiliary reclays, J1 auxiliary reclays, Ja auxiliary reclays, Jb auxiliary reclays, among Jc
Relay, KA auxiliary reclays, KB auxiliary reclays, KC auxiliary reclays, KA1 auxiliary reclays, KB1 auxiliary reclays, KC1
Auxiliary reclay, KVJ voltage relays, KMa monopoles vacuum contactor, KMb monopoles vacuum contactor, KMc monopole vacuum contacts
Device, the KT time relays, SBa test buttons, SBb test buttons, SBc test buttons, XD1 controls power supply indicator, XD2 are carried out
Detect indicator lamp, XDa A phases grounded signal lamp, XDb B phases grounded signal lamp, XDc C phases grounded signal lamp, Va A phase voltages
Table, Vb B phase voltages table, Vc C phase voltages table, DK control power circuit breaker, L power firestreaks, L1 binding posts, N zero-power lines,
N0 binding posts, D fault grounds point, XLa1 first via power supply circuit A phases, XLb1 first via power supply circuit B phases, the XLc1 first via
Power supply circuit C phases, the n-th roads of XLan power supply circuit A phases, the n-th roads of XLbn power supply circuit B phases, the n-th roads of XLcn power supply circuit C phases,
SBQ oscillographs, XB signal conversion process circuit, CPU microprocessor systems, TX communication interfaces.
Embodiment
Fig. 1 is single-phase earthing of small current earthing system DC detecting device main circuit control circuit schematic diagram, and Fig. 2 is small electricity
Flow grounding system single-phase grounding DC detecting device control relay circuit schematic diagram.Operation principle is：Under normal circumstances in Fig. 2
All relays are all in off position is disconnected, and control power supply indicator XD1 is bright, dc source transformer TB and bridge in Fig. 1
Formula rectifier Z is also at disconnection off position, Hall sensor H, Hall sensor H0, Hall sensor H1 and hall sensing
Device Hn does not have fault-signal.Operation principle when breaking down is illustrated, such as is grounded at fault ground point D, explanation
First via power supply circuit A phases XLa1 is grounded.When being grounded generation, there is three-phase imbalance, hall sensing in first via power supply circuit
Device H1 sends signal entering signal conversion process circuit XB, while star winding of voltage transformer cabinet PT voltage transformer
Y0 disequilibriums, the angular winding KV both ends of voltage transformer secondary opening are made to produce voltage, voltage relay KVJ adhesives, voltage
Relay KVJ normally opened contacts close, auxiliary reclay J adhesives, resistance 3, resistance 4, resistance 5 protect respectively KA auxiliary reclays,
KB auxiliary reclays and KC auxiliary reclays voltage will not be raised and damaged, voltage transformer secondary caused by power supply disequilibrium
The auxiliary reclay KA dead electricity of star winding y0 connections disconnects, and auxiliary reclay KA normally opened contacts disconnect notification signal conversion process
There is grounding phenomenon in circuit XB high pressure A phase power source bus a, while auxiliary reclay KA normally-closed contacts close, auxiliary reclay KA1
Adhesive, auxiliary reclay KA1 normally opened contacts closure, auxiliary reclay Ja and monopole vacuum contactor KMa adhesives, XD2 are examined
Survey indicator lamp XD2 is bright, and A phase grounded signal lamps XDa is bright, time relay KT and auxiliary reclay J1 adhesives, auxiliary reclay J1
Normally opened contact closes, and resistance R2 can reduce influence of the DC current to voltage transformer cabinet PT, while monopole vacuum contactor KMa
Normally opened contact close, connect dc source, at this moment bridge rectifier Z negative output terminals by current-limiting resistance R1, Hall sensor H,
The earth E0, fault ground point D, Hall sensor H1, disconnecting switch QF1, first via power supply circuit A phases XLa1, RDa1 fuse,
KMa monopoles vacuum contactor forms occlusion detection loop to the bridge rectifier Z positive output ends of dc source.Hall sensor H
With Hall sensor H0, Hall sensor H1 and Hall sensor Hn be collection single-phase earthing when fault-current signal, Hall
Sensor H1 signal has determined that first via power supply circuit has earth fault, and auxiliary reclay KA normally opened contacts, which disconnect, to be determined
It is that A phases are grounded, microprocessor system CPU is entered after being determined by signal conversion process circuit XB and carries out fault current detection analysis,
Oscillograph SBQ is the waveform at detection resistance R1 both ends, illustrates single-phase earthing state.Test is after certain time, time relay
The normally-closed contact that device KT delays disconnect disconnects, and a test period terminates, if failure is not excluded automatically by above-mentioned survey
Examination process is tested again.Test button SBa, test button SBb, test button SBc can be at any time to three phase supply circuits point
Do not tested.
Embodiment is circuit principle structure progress referring to Figures 1 and 2, is high pressure A phase power source bus a connections fusing
Device RDa1, high pressure B phase power source bus b connection fuse RDb1, high pressure C phase power source bus c connection fuse RDc1, fuse
RDa1 other ends connection monopole vacuum contactor KMa normally opened stationary contact, fuse RDb1 other ends connection monopole vacuum connect
Tentaculum KMb normally opened stationary contact, fuse RDc1 other ends connection monopole vacuum contactor KMc normally opened stationary contact are single
Pole vacuum contactor the KMa connection of normally opened moving contact end current-limiting resistance Ra, monopole vacuum contactor KMb normally opened moving contact end connect
Meet current-limiting resistance Rb, monopole vacuum contactor KMc normally opened moving contact end connection current-limiting resistance Rc, current-limiting resistance Ra and current limliting electricity
The resistance Rb and current-limiting resistance Rc other end connects bridge rectifier Z positive electricity source output terminal, bridge rectifier Z negative supply together
Output end connects resistance R1, resistance R1 other ends connection ground wire E0 and resistance R2 and relay J1 normally-closed contacts, resistance R2 and after
The other end connection voltage transformer cabinet PT voltage transformer first winding star Y0 neutral points of electrical equipment J1 normally-closed contacts, direct current
Source transformer TB secondary windings connection bridge rectifier Z ac input end, during dc source transformer TB armature windings pass through
Between relay J1 normally opened contacts control connection AC power, Hall sensor H be sleeved on ground wire E0 and resistance R1 between company
In wiring, Hall sensor H0 is sleeved on resistance R1 connection resistance R2 ground wire E0.Single-phase earthing signal acquisition circuit be
Hall sensor is put on circuit after the control of multichannel high-voltage power supply circuit disconnecting switch, obtains single-phase earthing signal, the first via
Power supply circuit is that high pressure A phase power source bus a and high pressure B phase power source bus b and high pressure C phase power source bus c are connected to isolation
On the static contact for switching QF1, first via power supply circuit A phases XLa1 and the first via power supply at disconnecting switch QF1 three-phase moving contacts end
Tri- supply lines of circuit B phases XLb1 and first via power supply circuit C phases XLc1 are output to power supply through Hall sensor H1 together and used
Family end, the n-th road power supply circuit are high pressure A phase power source bus a and high pressure B phase power source bus b and high pressure C phase power source bus c difference
It is connected on disconnecting switch QFn static contact, disconnecting switch QFn three-phase moving contacts Duan the n-th road power supply circuit A phases XLan and
N roads power supply circuit B phases XLbn and n-th road power supply circuit C phases tri- supply lines of XLcn are output to through Hall sensor Hn together
Power supply user terminal, Hall sensor H1 and Hall sensor Hn signal end enter at microcomputer by signal conversion process circuit XB
System CPU is managed, Hall sensor H0 is sleeved on resistance R1 connection resistance R2 ground wire E0, and Hall sensor H is sleeved on ground connection
On connecting line between line E0 and resistance R1, Hall sensor H and Hall sensor H0 signal end pass through signal conversion process
Circuit XB enters microprocessor system CPU.Star winding Y0 neutral point of voltage transformer of voltage transformer cabinet circuit and
The angular winding KV one end of voltage transformer secondary star winding y0 neutral points connection voltage transformer secondary opening, it is mutual to form voltage
Voltage transformer common port V0 in sensor cabinet PT, it is high pressure A phase power source bus a and high pressure B phase power source bus b and high pressure C phases electricity
Source bus c is connected on disconnecting switch QF1 static contact, and disconnecting switch GK three-phase moving contacts end connects mutual induction of voltage respectively
Star winding Y0 of device three heads, star winding Y0 of voltage transformer neutral point are connected in voltage transformer cabinet PT
Voltage transformer common port V0, voltage transformer secondary star winding y0 three heads connect fuse RDa2 and fuse respectively
Mutual induction of voltage in RDb2 and fuse RDc2, voltage transformer secondary star winding y0 neutral point connection voltage transformer cabinet PT
Device common port V0, fuse RDa2 other end connection A phase voltage Table V a and resistance R3 and auxiliary reclay J normally-closed contact,
The resistance R3 other end connects auxiliary reclay KA with the other end of auxiliary reclay J normally-closed contacts, and fuse RDb2's is another
End connection B phase voltage Table V b and resistance R4 and auxiliary reclay J normally-closed contact, resistance the R4 other end and auxiliary reclay J
Normally-closed contact the other end connection auxiliary reclay KB, fuse RDc2 the other end connection C phase voltage Table V c and resistance R5 and
Auxiliary reclay J normally-closed contact, the resistance R5 other end connect middle relay with the other end of auxiliary reclay J normally-closed contacts
Device KC, auxiliary reclay the KA other end and the auxiliary reclay KB other end and auxiliary reclay the KC other end all connect electricity
Press voltage transformer common port V0, the A phase voltage Table V a other end and B phase voltage Table V the b other end and C in transformer cabinet PT
The phase voltage Table V c other end all connects voltage transformer common port V0 in voltage transformer cabinet PT, voltage transformer secondary opening
Voltage transformer common port V0 and voltage relay KVJ, voltage are mutual in angular winding KV one end connection voltage transformer cabinet PT
The secondary angular winding KV of opening of the sensor other end connection voltage relay KVJ other end.AC control circuit is power supply fire
Line L disconnects normally closed touch by the DK control connection control power supply indicator XD1 and time relay KT delays of control power circuit breaker
Point, the other end connection binding post L1, zero-power line N of the normally closed delay break contacts of time relay KT break by control power supply
Road device DK controls connection binding post N0, control power supply indicator the XD1 other end connection resistance R6, resistance the R6 other end connect
Meet binding post N0, binding post L1 Connection Time relay KT normally opened contacts and auxiliary reclay Ja normally opened contacts and it is middle after
Electrical equipment Jb normally opened contacts and one end of auxiliary reclay Jc normally opened contacts parallel connection, time relay KT normally opened contacts and middle relay
The device Ja normally opened contacts other end in parallel with auxiliary reclay Jc normally opened contacts with auxiliary reclay Jb normally opened contacts connects progress
Indicator lamp XD2 and time relay KT and auxiliary reclay J1 is detected, detect indicator lamp XD2 other end connection resistance
R7, resistance the R7 other end connection binding post N0, the time relay KT other end connection binding post N0, auxiliary reclay
J1 other end connection binding post N0, binding post L1 connection voltage relay KVJ normally opened contacts, voltage relay KVJ are normal
Open contact the other end connection auxiliary reclay KA normally-closed contacts and auxiliary reclay KB normally-closed contacts and auxiliary reclay KC it is normal
Closed contact and auxiliary reclay J, the other end connection auxiliary reclay KA1 of auxiliary reclay KA normally-closed contacts, auxiliary reclay
The other end connection auxiliary reclay KB1 of KB normally-closed contacts, the middle relay of other end connection of auxiliary reclay KC normally-closed contacts
Device KC1, auxiliary reclay the KA1 other end connection binding post N0, auxiliary reclay KB1 other end connection binding post
N0, auxiliary reclay the KC1 other end connection binding post N0, auxiliary reclay J other end connection binding post N0, wiring
Terminal L1 connections auxiliary reclay KA1 normally opened contacts and auxiliary reclay Ja normally opened contacts and test button SBa, auxiliary reclay
The other end of KA1 normally opened contacts and the other end of auxiliary reclay Ja normally opened contacts and test button the SBa other end are together all
Auxiliary reclay Jb normally-closed contacts are connected, auxiliary reclay Jb normally-closed contacts are connected after being connected with auxiliary reclay Jc normally-closed contacts
Monopole vacuum contactor KMa and auxiliary reclay Ja and A phase grounded signal lamp XDa, monopole vacuum contactor the KMa other end connect
Binding post is connected after connecting resistance R8 and auxiliary reclay Ja normally-closed contacts, resistance R8 and auxiliary reclay Ja normally-closed contact parallel connections
N0, auxiliary reclay Ja other end connection binding post N0, A phase grounded signal lamp XDa other end connection resistance R9, resistance
R9 other end connection binding post N0, binding post L1 connections auxiliary reclay KB1 normally opened contacts and auxiliary reclay Jb are normal
Open contact and test button SBb, the other ends of auxiliary reclay KB1 normally opened contacts and auxiliary reclay Jb normally opened contacts it is another
End and test button SBb the other end together all connect auxiliary reclay Ja normally-closed contacts, auxiliary reclay Ja normally-closed contacts with
Monopole vacuum contactor KMb and auxiliary reclay Jb and B phase grounded signal lamp are connected after the series connection of auxiliary reclay Jc normally-closed contacts
XDb, monopole vacuum contactor KMb other end connection resistance R10 and auxiliary reclay Jb normally-closed contacts, resistance R10 and centre
Connect binding post N0 after relay Jb normally-closed contact parallel connections, auxiliary reclay Jb other end connection binding post N0, B connect
Ground indicator lamp the XDb other end connection resistance R11, resistance R11 other end connection binding post N0, in binding post L1 connections
Between relay KC1 normally opened contacts and auxiliary reclay Jc normally opened contacts and test button SBc, auxiliary reclay KC1 normally opened contacts
The other end and auxiliary reclay Jc normally opened contacts the other end and test button SBc the other end together all connect among relay
Device Ja normally-closed contacts, auxiliary reclay Ja normally-closed contacts are connected monopole vacuum contact after being connected with auxiliary reclay Jb normally-closed contacts
Device KMc and auxiliary reclay Jc and C phase grounded signal lamp XDc, monopole vacuum contactor the KMc other end connect resistance R12 and
Connect binding post N0 after auxiliary reclay Jc normally-closed contacts, resistance R12 and auxiliary reclay Jc normally-closed contact parallel connections, it is middle after
Electrical equipment Jc other end connection binding post N0, C phase grounded signal lamp XDc other end connection resistance R13, resistance R13's is another
One end connection binding post N0.Microprocessor system is to measure single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit
Ground signalling be sent to microprocessor system, by microprocessor system CPU handle display ground connection position, Hall sensor H1
Signal conversion process circuit XB, Hall sensor H and Hall sensor H0 letter is connected to Hall sensor Hn signal end
Number end is connected to signal conversion process circuit XB, auxiliary reclay KA normally opened contacts and auxiliary reclay KB normally opened contacts and centre
The action signal of relay KC normally opened contacts is connected to signal conversion process circuit XB, enters by signal conversion process circuit XB
Microprocessor system CPU shows the position of earth fault, and communication interface TX is communication interface.Oscilloscope display system can directly be seen
Line-to-ground situation is examined, oscillograph SBQ measurement lines are connected to resistance R1 both ends.
Claims (6)
1. single-phase earthing of small current earthing system DC detecting device, including the online power supply circuit of direct current and single-phase earthing signal obtain
Sense circuit and voltage transformer cabinet circuit and AC control circuit and microprocessor system and oscilloscope display system, direct current are online
Power supply circuit is that the automatic detection for applying DC low-voltage power supply and carrying out singlephase earth fault is connected to high voltage supply online circuit,
Single-phase earthing signal acquisition circuit is that Hall sensor is covered on the circuit after the control of multichannel high-voltage power supply circuit disconnecting switch,
Obtain single-phase earthing signal entering signal conversion process circuit XB, star of voltage transformer of voltage transformer cabinet circuit around
Group Y0 neutral points connect the angular winding KV mono- of voltage transformer secondary opening with voltage transformer secondary star winding y0 neutral points
End, forms voltage transformer common port V0 in voltage transformer cabinet PT, and AC control circuit is power firestreak L by control power supply
Breaker DK controls connects binding post L1 with time relay KT delay disconnection normally-closed contacts, and zero-power line N is by control electricity
Source breaker DK control connection binding post N0, microprocessor system is by single-phase earthing signal acquisition circuit and voltage transformer
The ground signalling that cabinet circuit is measured is sent to microprocessor system, the position of display ground connection is handled by microprocessor system CPU, suddenly
Your sensor H1 and Hall sensor Hn signal end is connected to signal conversion process circuit XB, and oscilloscope display system can be direct
Line-to-ground situation is observed, is characterized in that application DC low-voltage power supply is connected to high voltage supply online circuit carries out single-phase earthing event
The automatic detection of barrier, the influence of capacitance current is avoided, the online power supply circuit of direct current is by fuse, monopole vacuum contact
Device, bridge rectifier, dc source transformer, resistance composition, are high pressure A phase power source bus a connections fuse RDa1, high pressure B
Phase power source bus b connection fuse RDb1, high pressure C phase power source bus c connections fuse RDc1, fuse the RDa1 other end connect
Monopole vacuum contactor KMa normally opened stationary contact, fuse RDb1 other ends connection monopole vacuum contactor KMb's is normally opened quiet
Contact end, fuse RDc1 other ends connection monopole vacuum contactor KMc normally opened stationary contact, monopole vacuum contactor KMa
The connection of normally opened moving contact end current-limiting resistance Ra, monopole vacuum contactor KMb normally opened moving contact end connection current-limiting resistance Rb, it is single
Pole vacuum contactor KMc normally opened moving contact end connection current-limiting resistance Rc, current-limiting resistance Ra and current-limiting resistance Rb and current-limiting resistance
The Rc other end connects bridge rectifier Z positive electricity source output terminal, bridge rectifier Z negative electricity source output terminal connection resistance together
R1, resistance the R1 other end connect ground wire E0 and resistance R2 and relay J1 normally-closed contacts, resistance R2 and relay J1 normally-closed contacts
The other end connection voltage transformer cabinet PT voltage transformer first winding star Y0 neutral points, TB level of dc source transformer
Winding connection bridge rectifier Z ac input end, dc source transformer TB armature windings are normally opened by auxiliary reclay J1
Contact control connection AC power, Hall sensor H are sleeved on the connecting line between ground wire E0 and resistance R1, hall sensing
Device H0 is sleeved on resistance R1 connection resistance R2 ground wire E0.
2. single-phase earthing of small current earthing system DC detecting device according to claim 1, including single-phase earthing signal
Obtain circuit, it is characterised in that single-phase earthing signal acquisition circuit is the line after the control of multichannel high-voltage power supply circuit disconnecting switch
Hall sensor is put on road, obtains single-phase earthing signal, first via power supply circuit is high pressure A phase power source bus a and high pressure B phases
Power source bus b and high pressure C phase power source bus c are connected on disconnecting switch QF1 static contact, and disconnecting switch QF1 three-phases move
The first via power supply circuit A phases XLa1 and first via power supply circuit B phases XLb1 and first via power supply circuit C phases XLc1 tri- of contact end
Root supply lines is output to power supply user terminal through Hall sensor H1 together, and the n-th road power supply circuit is high pressure A phase power source bus a
It is connected to high pressure B phase power source bus b and high pressure C phase power source bus c on disconnecting switch QFn static contact, disconnecting switch
The n-th roads of QFn three-phase moving contacts Duan power supply circuit A phases XLan and the n-th road power supply circuit B phases XLbn and the n-th road power supply circuit C phases
Tri- supply lines of XLcn are output to power supply user terminal, Hall sensor H1 and Hall sensor Hn through Hall sensor Hn together
Signal end enter microprocessor system CPU by signal conversion process circuit XB, Hall sensor H0 is sleeved on resistance R1 companies
On connecting resistance R2 ground wire E0, Hall sensor H is sleeved on the connecting line between ground wire E0 and resistance R1, Hall sensor
H and Hall sensor H0 signal end enter microprocessor system CPU by signal conversion process circuit XB.
3. single-phase earthing of small current earthing system DC detecting device according to claim 1, including voltage transformer cabinet
Circuit, it is characterised in that star winding Y0 neutral point of voltage transformer and voltage transformer two of voltage transformer cabinet circuit
Secondary angular winding KV one end of star winding y0 neutral points connection voltage transformer secondary opening, forms electricity in voltage transformer cabinet PT
Transformer common port V0 is pressed, is that high pressure A phase power source bus a and high pressure B phase power source bus b and high pressure C phase power source bus c connect respectively
Be connected on disconnecting switch QF1 static contact, disconnecting switch GK three-phase moving contacts end connect respectively star of voltage transformer around
Group Y0 three heads, star winding Y0 of voltage transformer neutral point connect voltage transformer public affairs in voltage transformer cabinet PT
V0 is held altogether, and voltage transformer secondary star winding y0 three heads connect fuse RDa2 and fuse RDb2 and fuse respectively
Voltage transformer common port V0 in RDc2, voltage transformer secondary star winding y0 neutral point connection voltage transformer cabinet PT,
Fuse RDa2 other end connection A phase voltage Table V a and resistance R3 and auxiliary reclay J normally-closed contact, resistance R3's is another
End connects auxiliary reclay KA, fuse RDb2 other end connection B phase voltages with the other end of auxiliary reclay J normally-closed contacts
Table V b and resistance R4 and auxiliary reclay J normally-closed contact, the resistance R4 other end and auxiliary reclay J normally-closed contacts it is another
End connection auxiliary reclay KB, fuse RDc2 other end connection C phase voltage Table V c's and resistance R5 and auxiliary reclay J is normal
Closed contact, the resistance R5 other end connect auxiliary reclay KC, auxiliary reclay with the other end of auxiliary reclay J normally-closed contacts
The KA other end and the auxiliary reclay KB other end and auxiliary reclay the KC other end are all connected in voltage transformer cabinet PT
Voltage transformer common port V0, the A phase voltage Table V a other end and the B phase voltage Table V b other end and C phase voltage Table V c it is another
One end all connects voltage transformer common port V0 in voltage transformer cabinet PT, and the one of the angular winding KV of voltage transformer secondary opening
Voltage transformer common port V0 and voltage relay KVJ in the connection voltage transformer cabinet PT of end, voltage transformer secondary angular aperture
The shape winding KV other end connection voltage relay KVJ other end.
4. single-phase earthing of small current earthing system DC detecting device according to claim 1, including AC control circuit,
It is characterized in that AC control circuit is power firestreak L controls power supply indicator by the DK control connections of control power circuit breaker
XD1 and time relay KT delays disconnect normally-closed contact, and the other end of the normally closed delay break contacts of time relay KT connects
Line terminals L1, zero-power line N control power supply indicator XD1's by control power circuit breaker DK control connection binding post N0
The other end connects resistance R6, and the resistance R6 other end connection binding post N0, binding post L1 Connection Time relays KT is normally opened
Contact and auxiliary reclay Ja normally opened contacts and auxiliary reclay Jb normally opened contacts and auxiliary reclay Jc normally opened contacts are in parallel
One end, time relay KT normally opened contacts and auxiliary reclay Ja normally opened contacts and auxiliary reclay Jb normally opened contacts and it is middle after
The other end connection in parallel of electrical equipment Jc normally opened contacts carries out detecting indicator lamp XD2 and time relay KT and auxiliary reclay J1,
Detect indicator lamp the XD2 other end connection resistance R7, resistance the R7 other end connection binding post N0, time relay KT
The other end connection binding post N0, auxiliary reclay J1 the other end connection binding post N0, binding post L1 connection voltages
Relay KVJ normally opened contacts, the other end connection auxiliary reclay KA normally-closed contacts of voltage relay KVJ normally opened contacts and centre
Relay KB normally-closed contacts and auxiliary reclay KC normally-closed contacts and auxiliary reclay J, auxiliary reclay KA normally-closed contacts it is another
One end connects auxiliary reclay KA1, the other end connection auxiliary reclay KB1 of auxiliary reclay KB normally-closed contacts, middle relay
The other end connection auxiliary reclay KC1, auxiliary reclay KA1 of device KC normally-closed contacts other end connection binding post N0, in
Between relay KB1 the other end connection binding post N0, auxiliary reclay KC1 other end connection binding post N0, it is middle after
Electrical equipment J other end connection binding post N0, binding post L1 connections auxiliary reclay KA1 normally opened contacts and auxiliary reclay Ja
Normally opened contact and test button SBa, the other ends of auxiliary reclay KA1 normally opened contacts and auxiliary reclay Ja normally opened contacts it is another
One end and test button the SBa other end all connect auxiliary reclay Jb normally-closed contacts, auxiliary reclay Jb normally-closed contacts together
Monopole vacuum contactor KMa is connected after being connected with auxiliary reclay Jc normally-closed contacts and auxiliary reclay Ja and A phase is grounded instruction
Lamp XDa, monopole vacuum contactor KMa other end connection resistance R8 and auxiliary reclay Ja normally-closed contacts, resistance R8 and centre
Connect binding post N0 after relay Ja normally-closed contact parallel connections, auxiliary reclay Ja other end connection binding post N0, A connect
Ground indicator lamp the XDa other end connection resistance R9, resistance R9 other end connection binding post N0, binding post L1 connections are middle
Relay KB1 normally opened contacts and auxiliary reclay Jb normally opened contacts and test button SBb, auxiliary reclay KB1 normally opened contacts
The other end of the other end and test button SBb of the other end and auxiliary reclay Jb normally opened contacts all connects auxiliary reclay together
Ja normally-closed contacts, auxiliary reclay Ja normally-closed contacts are connected monopole vacuum contactor after being connected with auxiliary reclay Jc normally-closed contacts
KMb and auxiliary reclay Jb and B phase grounded signal lamp XDb, monopole vacuum contactor the KMb other end connect resistance R10 with
Between relay Jb normally-closed contacts, connect binding post N0, middle relay after resistance R10 and auxiliary reclay Jb normally-closed contact parallel connections
Device Jb other end connection binding post N0, B phase grounded signal lamp XDb other end connection resistance R11, resistance R11's is another
End connection binding post N0, binding post L1 connections auxiliary reclay KC1 normally opened contacts and auxiliary reclay Jc normally opened contacts with
Test button SBc, the other end and the experiment of the other end and auxiliary reclay Jc normally opened contacts of auxiliary reclay KC1 normally opened contacts
The button SBc other end all connects auxiliary reclay Ja normally-closed contacts, auxiliary reclay Ja normally-closed contacts and middle relay together
Monopole vacuum contactor KMc and auxiliary reclay Jc and C phase grounded signal lamp XDc, monopole are connected after the series connection of device Jb normally-closed contacts
Vacuum contactor KMc other end connection resistance R12 and auxiliary reclay Jc normally-closed contacts, resistance R12 and auxiliary reclay Jc
Binding post N0, auxiliary reclay Jc other end connection binding post N0, C phase grounded signal lamp are connected after normally-closed contact parallel connection
The XDc other end connection resistance R13, resistance R13 other end connection binding post N0.
5. single-phase earthing of small current earthing system DC detecting device according to claim 1, including microprocessor system,
Believe it is characterized in that microprocessor system is the ground connection for measuring single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit
Number microprocessor system is sent to, the position of display ground connection is handled by microprocessor system CPU, Hall sensor H1 and Hall pass
Sensor Hn signal end is connected to the signal end of signal conversion process circuit XB processing, Hall sensor H and Hall sensor H0
It is connected to signal conversion process circuit XB, auxiliary reclay KA normally opened contacts and auxiliary reclay KB normally opened contacts and middle relay
The action signal of device KC normally opened contacts is connected to signal conversion process circuit XB, enters microcomputer by signal conversion process circuit XB
Processing system CPU shows the position of earth fault, and communication interface TX is communication interface.
6. single-phase earthing of small current earthing system DC detecting device according to claim 1, including oscilloscope display system
System, it is characterised in that oscilloscope display system can directly observe line-to-ground situation, and oscillograph SBQ measurement lines are connected to resistance R1
Both ends.
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| CN106291318B (en) * | 2016-08-04 | 2020-03-27 | 中车戚墅堰机车有限公司 | Locomotive control loop grounding detection device and control method thereof |
| CN108109862A (en) * | 2017-12-29 | 2018-06-01 | 国家电网公司 | A kind of intelligent air switch that can detect DC earthing |
| CN110231540B (en) * | 2019-06-04 | 2020-07-28 | 西安交通大学 | Be used for false bipolar direct current transmission and distribution lines unipolar earth fault positioning system |
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Effective date of registration: 20190313 Address after: 210000 Room 509, Building No. 18, Weigang West, Baixia District, Nanjing City, Jiangsu Province Patentee after: Zhang Zhenhan Address before: 325200 Gongtai Electrical Appliances Co., Ltd., Ninth Building, East Head, Fourth Floor, Yunjiang Standard Factory Building, Nanbin Street, Ruian City, Zhejiang Province Patentee before: Jie Guoan |
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