CN204241604U - 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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- CN204241604U CN204241604U CN201420452080.XU CN201420452080U CN204241604U CN 204241604 U CN204241604 U CN 204241604U CN 201420452080 U CN201420452080 U CN 201420452080U CN 204241604 U CN204241604 U CN 204241604U
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Abstract
DC detecting device during the utility model single-phase earthing of small current earthing system, relate to small current neutral grounding detection technique field, that the automatic detection that DC low-voltage power supply carries out singlephase earth fault is applied to high voltage supply online circuit, avoid the impact of capacitance current, when any road feed circuit earth fault occurs, voltage transformer (VT) star winding Y0 of voltage transformer cabinet PT can out of trim, make voltage transformer secondary opening dihedral winding KV both end voltage relay K VJ adhesive, start automatically to detect, Hall element H1, Hall element Hn, Hall element H, Hall element H0 sends signal entering signal conversion process circuit XB, by signal conversion process circuit XB determine laggard enter microprocessor system CPU carry out fault current detection analysis, oscillograph SBQ is the waveform detecting resistance R1 two ends.The utility model provides a kind of and meets safety requirements, clear principle, safe and reliable, the automatic detection device that detects single-phase grounded malfunction in grounded system of low current accurately, can be widely used in electric power system.
Description
Technical field:
The utility model relates to small current neutral grounding detection technique field, particularly DC detecting device during single-phase earthing of small current earthing system.
Background technology:
Small current neutral grounding system is widely used in electric power system, though system single-phase-to-ground current is little, long-time running easily causes line to line fault, and arc discharge can cause system overvoltage, very harmful to electrical network, must accurately select faulty line as early as possible and excise it.But the zero-sequence current Small Electric Current Earthing And Routing Device adopted for a long time is because of the uncertainty of capacitance current, and route selection effect is undesirable, sometimes even can report by mistake, it is passive greatly to cause to production.
Summary of the invention:
The purpose of this utility model is for above-mentioned defect, avoid the impact of capacitance current, change the deficiency of zero-sequence current line selection apparatus, be apply to high voltage supply online circuit the automatic detection that DC low-voltage power supply carries out singlephase earth fault, object is to provide and a kind ofly meets safety requirements, clear principle, safe and reliable, the automatic detection device that detects single-phase grounded malfunction in grounded system of low current accurately.
The technical solution of the utility model is single-phase earthing of small current earthing system DC detecting device, comprise the online feed circuit of direct current and single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit and AC control circuit and microprocessor system and oscilloscope display system, it is characterized in that connecting high voltage supply online circuit applying the automatic detection that DC low-voltage power supply carries out singlephase earth fault, avoid the impact of capacitance current, the online feed circuit of direct current are by fuse, one pole vacuum contactor, bridge rectifier, direct supply transformer, the compositions such as resistance, that high pressure A phase power source bus a connects fuse RDa1, high pressure B phase power source bus b connects fuse RDb1, high pressure C phase power source bus c connects fuse RDc1, fuse RDa1 other end connection one pole vacuum contactor KMa often leaves stationary contact, fuse RDb1 other end connection one pole vacuum contactor KMb often leaves stationary contact, fuse RDc1 other end connection one pole vacuum contactor KMc often leaves stationary contact, the contact end of often starting of one pole vacuum contactor KMa connects current-limiting resistance Ra, the contact end of often starting of one pole vacuum contactor KMb connects current-limiting resistance Rb, the contact end of often starting of one pole vacuum contactor KMc connects current-limiting resistance Rc, current-limiting resistance Ra and current-limiting resistance Rb and the other end of current-limiting resistance Rc are connected the positive supply output terminal of bridge rectifier Z together, the negative supply output terminal contact resistance R1 of bridge rectifier Z, the resistance R1 other end connects ground wire E0 and resistance R2 and relay J 1 normally closed contact, the other end of resistance R2 and relay J 1 normally closed contact connects voltage transformer cabinet PT voltage transformer (VT) winding star Y0 neutral point, direct supply transformer TB secondary winding connects the ac input end of bridge rectifier Z, direct supply transformer TB armature winding is through auxiliary reclay J1 normally opened contact control linkage AC power, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R1, Hall element H0 is sleeved on the ground wire E0 of resistance R1 contact resistance R2.
Described single-phase earthing of small current earthing system DC detecting device, comprise single-phase earthing signal acquisition circuit, it is characterized in that single-phase earthing signal acquisition circuit be multichannel high-voltage power supply circuit disconnector control after circuit on overlap Hall element, obtain single-phase earthing signal, first via feed circuit are 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 on the static contact of disconnector QF1, power supply user side is outputted to through Hall element H1 together with first via feed circuit A phase XLa1 and first via feed circuit B phase XLb1 and first via feed circuit C phase XLc1 tri-supply lines of disconnector QF1 three-phase moving contact end, n-th road feed circuit are 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 on the static contact of disconnector QFn, power supply user side is outputted to through Hall element Hn together with disconnector QFn three-phase moving contact Duan n-th road feed circuit A phase XLan and the n-th road feed circuit B phase XLbn and the n-th road feed circuit C phase XLcn tri-supply lines, the signal end of Hall element H1 and Hall element Hn enters microprocessor system CPU through signal conversion process circuit XB, Hall element H0 is sleeved on the ground wire E0 of resistance R1 contact resistance R2, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R1, the signal end of Hall element H and Hall element H0 enters microprocessor system CPU through signal conversion process circuit XB.
Described single-phase earthing of small current earthing system DC detecting device, comprise voltage transformer cabinet circuit, it is characterized in that voltage transformer (VT) star winding Y0 neutral point of voltage transformer cabinet circuit is connected voltage transformer secondary opening dihedral winding KV one end with voltage transformer secondary star winding y0 neutral point, voltage transformer (VT) common port V0 in coating-forming voltage mutual inductor cabinet PT, 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 on the static contact of disconnector QF1, disconnector GK three-phase moving contact end connects three heads of a voltage transformer (VT) star winding Y0 respectively, the neutral point of a voltage transformer (VT) star winding Y0 connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, three heads of voltage transformer secondary star winding y0 connect fuse RDa2 and fuse RDb2 and fuse RDc2 respectively, the neutral point of voltage transformer secondary star winding y0 connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, the other end of fuse RDa2 connects the normally closed contact of A phase voltage Table V a and resistance R3 and auxiliary reclay J, the other end of resistance R3 is connected auxiliary reclay KA with the other end of auxiliary reclay J normally closed contact, the other end of fuse RDb2 connects the normally closed contact of B phase voltage Table V b and resistance R4 and auxiliary reclay J, the other end of resistance R4 is connected auxiliary reclay KB with the other end of auxiliary reclay J normally closed contact, the other end of fuse RDc2 connects the normally closed contact of C phase voltage Table V c and resistance R5 and auxiliary reclay J, the other end of resistance R5 is connected auxiliary reclay KC with the other end of auxiliary reclay J normally closed contact, the other end of auxiliary reclay KA is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of auxiliary reclay KB and the other end of auxiliary reclay KC, the other end of A phase voltage Table V a is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of B phase voltage Table V b and the other end of C phase voltage Table V c, one end of voltage transformer secondary opening dihedral winding KV connects voltage transformer (VT) common port V0 and voltage relay KVJ in voltage transformer cabinet PT, the other end of voltage transformer secondary opening dihedral winding KV connects the other end of voltage relay KVJ.
Described single-phase earthing of small current earthing system DC detecting device, comprise AC control circuit, it is characterized in that AC control circuit is that power firestreak L controls power light XD1 and time relay KT time delay disconnection normally closed contact through controlling power circuit breaker DK control linkage, the other end of the normally closed time delay break contact of time relay KT connects connection terminal L1, zero-power line N is through controlling power circuit breaker DK control linkage connection terminal N0, control the other end contact resistance R6 of power light XD1, the other end of resistance R6 connects connection terminal N0, one end of connection terminal L1 tie-time relay K T normally opened contact and auxiliary reclay Ja normally opened contact and auxiliary reclay Jb normally opened contact and the parallel connection of auxiliary reclay Jc normally opened contact, time relay KT normally opened contact and auxiliary reclay Ja normally opened contact and auxiliary reclay Jb normally opened contact are connected with the other end of auxiliary reclay Jc normally opened contact parallel connection and carry out detection pilot lamp XD2 and time relay KT and auxiliary reclay J1, carry out the other end contact resistance R7 detecting pilot lamp XD2, the other end of resistance R7 connects connection terminal N0, the other end of time relay KT connects connection terminal N0, the other end of auxiliary reclay J1 connects connection terminal N0, connection terminal L1 connects voltage relay KVJ normally opened contact, the other end of voltage relay KVJ normally opened contact connects auxiliary reclay KA normally closed contact and auxiliary reclay KB normally closed contact and auxiliary reclay KC normally closed contact and auxiliary reclay J, the other end of auxiliary reclay KA normally closed contact connects auxiliary reclay KA1, the other end of auxiliary reclay KB normally closed contact connects auxiliary reclay KB1, the other end of auxiliary reclay KC normally closed contact connects auxiliary reclay KC1, the other end of auxiliary reclay KA1 connects connection terminal N0, the other end of auxiliary reclay KB1 connects connection terminal N0, the other end of auxiliary reclay KC1 connects connection terminal N0, the other end of auxiliary reclay J connects connection terminal N0, connection terminal L1 connects auxiliary reclay KA1 normally opened contact and auxiliary reclay Ja normally opened contact and test button SBa, the other end of auxiliary reclay KA1 normally opened contact is all connected auxiliary reclay Jb normally closed contact with the other end of auxiliary reclay Ja normally opened contact together with the other end of test button SBa, auxiliary reclay Jb normally closed contact is connected one pole vacuum contactor KMa and auxiliary reclay Ja and A phase ground lamp XDa after connecting with auxiliary reclay Jc normally closed contact, the other end contact resistance R8 of one pole vacuum contactor KMa and auxiliary reclay Ja normally closed contact, resistance R8 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Ja normally closed contact, the other end of auxiliary reclay Ja connects connection terminal N0, the other end contact resistance R9 of A phase ground lamp XDa, the other end of resistance R9 connects connection terminal N0, connection terminal L1 connects auxiliary reclay KB1 normally opened contact and auxiliary reclay Jb normally opened contact and test button SBb, the other end of auxiliary reclay KB1 normally opened contact is all connected auxiliary reclay Ja normally closed contact with the other end of auxiliary reclay Jb normally opened contact together with the other end of test button SBb, auxiliary reclay Ja normally closed contact is connected one pole vacuum contactor KMb and auxiliary reclay Jb and B phase ground lamp XDb after connecting with auxiliary reclay Jc normally closed contact, the other end contact resistance R10 of one pole vacuum contactor KMb and auxiliary reclay Jb normally closed contact, resistance R10 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Jb normally closed contact, the other end of auxiliary reclay Jb connects connection terminal N0, the other end contact resistance R11 of B phase ground lamp XDb, the other end of resistance R11 connects connection terminal N0, connection terminal L1 connects auxiliary reclay KC1 normally opened contact and auxiliary reclay Jc normally opened contact and test button SBc, the other end of auxiliary reclay KC1 normally opened contact is all connected auxiliary reclay Ja normally closed contact with the other end of auxiliary reclay Jc normally opened contact together with the other end of test button SBc, auxiliary reclay Ja normally closed contact is connected one pole vacuum contactor KMc and auxiliary reclay Jc and C phase ground lamp XDc after connecting with auxiliary reclay Jb normally closed contact, the other end contact resistance R12 of one pole vacuum contactor KMc and auxiliary reclay Jc normally closed contact, resistance R12 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Jc normally closed contact, the other end of auxiliary reclay Jc connects connection terminal N0, the other end contact resistance R13 of C phase ground lamp XDc, the other end of resistance R13 connects connection terminal N0.
Described single-phase earthing of small current earthing system DC detecting device, comprise microprocessor system, it is characterized in that microprocessor system is that the ground signalling that single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit are measured is delivered to microprocessor system, through the position of microprocessor system CPU processes and displays ground connection, the signal end of Hall element H1 and Hall element Hn is connected to signal conversion process, the signal end of Hall element H and Hall element H0 is connected to signal conversion process circuit XB, the actuating signal of auxiliary reclay KA normally opened contact and auxiliary reclay KB normally opened contact and auxiliary reclay KC normally opened contact is connected to signal conversion process circuit XB, the position of microprocessor system CPU display earth fault is entered through signal conversion process circuit XB.
Described single-phase earthing of small current earthing system DC detecting device, comprises oscilloscope display system, and it is characterized in that oscilloscope display system can directly observe line-to-ground situation, oscillograph SBQ slotted line is connected to the two ends of resistance R1.
The utility model applies to high voltage supply online circuit the automatic detection that DC low-voltage power supply carries out singlephase earth fault, avoid the impact of capacitance current, change the deficiency of zero-sequence current line selection apparatus, the utility model provides a kind of and meets safety requirements, clear principle, safe and reliable, the automatic detection device that detects single-phase grounded malfunction in grounded system of low current accurately, can be widely used in electric power system.
Accompanying drawing explanation
Fig. 1 single-phase earthing of small current earthing system DC detecting device main circuit control circuit schematic diagram
Fig. 2 single-phase earthing of small current earthing system DC detecting device control relay circuit schematic diagram
A high pressure A phase power source bus in figure, b high pressure B phase power source bus, c high pressure C phase power source bus, RDa1 fuse, RDb1 fuse, RDc1 fuse, RDa2 fuse, RDb2 fuse, RDc2 fuse, Ra current-limiting resistance, Rb current-limiting resistance, Rc current-limiting resistance, R1-R13 resistance, Z bridge rectifier, TB direct supply transformer, GK disconnector, QF1 disconnector, QFn disconnector, H Hall element, H0 Hall element, H1 Hall element, Hn Hall element, PT voltage transformer cabinet, Y0 voltage transformer (VT) star winding, y0 voltage transformer secondary star winding, KV voltage transformer secondary opening dihedral winding, V0 voltage transformer (VT) common port, J auxiliary reclay, J1 auxiliary reclay, Ja auxiliary reclay, Jb auxiliary reclay, Jc auxiliary reclay, KA auxiliary reclay, KB auxiliary reclay, KC auxiliary reclay, KA1 auxiliary reclay, KB1 auxiliary reclay, KC1 auxiliary reclay, KVJ voltage relay, KMa one pole vacuum contactor, KMb one pole vacuum contactor, KMc one pole vacuum contactor, the KT time relay, SBa test button, SBb test button, SBc test button, XD1 controls power light, XD2 carries out detection pilot lamp, XDa A phase ground lamp, XDb B phase ground lamp, XDc C phase ground lamp, Va A phase voltage table, Vb B phase voltage table, Vc C phase voltage table, DK controls power circuit breaker, L power firestreak, L1 connection terminal, N zero-power line, N0 connection terminal, D fault ground point, XLa1 first via feed circuit A phase, XLb1 first via feed circuit B phase, XLc1 first via feed circuit C phase, XLan n-th road feed circuit A phase, XLbn n-th road feed circuit B phase, XLcn n-th road feed circuit C phase, SBQ oscillograph, XB signal conversion process circuit, CPU microprocessor system, TX communication interface.
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 single-phase earthing of small current earthing system DC detecting device control relay circuit schematic diagram.Principle of work is: in Fig. 2, all relays are all in disconnection off position under normal circumstances, control power light XD1 bright, in Fig. 1, direct supply transformer TB and bridge rectifier Z is also in disconnection off position, and Hall element H, Hall element H0, Hall element H1 and Hall element Hn do not have fault-signal.Illustrate principle of work when breaking down, such as there is ground connection in fault ground point D place, and first via feed circuit A phase XLa1 ground connection is described.When ground connection occurs, there is three-phase imbalance in first via feed circuit, Hall element H1 sends signal entering signal conversion process circuit XB, voltage transformer (VT) star winding Y0 out of trim of voltage transformer cabinet PT simultaneously, voltage transformer secondary opening dihedral winding KV two ends are made to produce voltage, voltage relay KVJ adhesive, voltage relay KVJ normally opened contact closes, auxiliary reclay J adhesive, resistance 3, resistance 4, resistance 5 protects KA auxiliary reclay respectively, KB auxiliary reclay and KC auxiliary reclay can not damage because power supply out of trim causes voltage to raise, the auxiliary reclay KA dead electricity that voltage transformer secondary star winding y0 connects disconnects, auxiliary reclay KA normally opened contact disconnects notification signal conversion process circuit XB high pressure A phase power source bus a and occurs grounding phenomenon, auxiliary reclay KA normally closed contact closes simultaneously, auxiliary reclay KA1 adhesive, auxiliary reclay KA1 normally opened contact closes, auxiliary reclay Ja and one pole vacuum contactor KMa adhesive, it is bright that XD2 carries out detection pilot lamp XD2, XDa is bright for A phase ground lamp, time relay KT and auxiliary reclay J1 adhesive, auxiliary reclay J1 normally opened contact closes, resistance R2 can reduce the impact of DC current on voltage transformer cabinet PT, one pole vacuum contactor KMa normally opened contact closes simultaneously, connect direct supply, at this moment bridge rectifier Z negative output terminal is through current-limiting resistance R1, Hall element H, the earth E0, fault ground point D, Hall element H1, disconnector QF1, first via feed circuit A phase XLa1, RDa1 fuse, KMa one pole vacuum contactor is to the bridge rectifier Z positive output end of direct supply, form occlusion detection loop.Hall element H and Hall element H0, Hall element H1 and Hall element Hn is fault-current signal when gathering single-phase earthing, the signal of Hall element H1 has determined that first via feed circuit have earth fault, it is A phase ground connection that the disconnection of auxiliary reclay KA normally opened contact determines, by signal conversion process circuit XB determine laggard enter microprocessor system CPU carry out fault current detection analysis, oscillograph SBQ is the waveform detecting resistance R1 two ends, and single-phase earthing state is described.Test is after certain hour, and the normally closed contact that time relay KT time delay disconnects disconnects, and a test period terminates, and will automatically again test by above-mentioned test process if fault is not excluded.Test button SBa, test button SBb, test button SBc can test three phase supply circuit at any time respectively.
Embodiment is that the circuit principle structure that sees figures.1.and.2 carries out, that high pressure A phase power source bus a connects fuse RDa1, high pressure B phase power source bus b connects fuse RDb1, high pressure C phase power source bus c connects fuse RDc1, fuse RDa1 other end connection one pole vacuum contactor KMa often leaves stationary contact, fuse RDb1 other end connection one pole vacuum contactor KMb often leaves stationary contact, fuse RDc1 other end connection one pole vacuum contactor KMc often leaves stationary contact, the contact end of often starting of one pole vacuum contactor KMa connects current-limiting resistance Ra, the contact end of often starting of one pole vacuum contactor KMb connects current-limiting resistance Rb, the contact end of often starting of one pole vacuum contactor KMc connects current-limiting resistance Rc, current-limiting resistance Ra and current-limiting resistance Rb and the other end of current-limiting resistance Rc are connected the positive supply output terminal of bridge rectifier Z together, the negative supply output terminal contact resistance R1 of bridge rectifier Z, the resistance R1 other end connects ground wire E0 and resistance R2 and relay J 1 normally closed contact, the other end of resistance R2 and relay J 1 normally closed contact connects voltage transformer cabinet PT voltage transformer (VT) winding star Y0 neutral point, direct supply transformer TB secondary winding connects the ac input end of bridge rectifier Z, direct supply transformer TB armature winding is through auxiliary reclay J1 normally opened contact control linkage AC power, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R1, Hall element H0 is sleeved on the ground wire E0 of resistance R1 contact resistance R2.Single-phase earthing signal acquisition circuit is that the circuit after multichannel high-voltage power supply circuit disconnector controls overlaps Hall element, obtain single-phase earthing signal, first via feed circuit are 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 on the static contact of disconnector QF1, power supply user side is outputted to through Hall element H1 together with first via feed circuit A phase XLa1 and first via feed circuit B phase XLb1 and first via feed circuit C phase XLc1 tri-supply lines of disconnector QF1 three-phase moving contact end, n-th road feed circuit are 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 on the static contact of disconnector QFn, power supply user side is outputted to through Hall element Hn together with disconnector QFn three-phase moving contact Duan n-th road feed circuit A phase XLan and the n-th road feed circuit B phase XLbn and the n-th road feed circuit C phase XLcn tri-supply lines, the signal end of Hall element H1 and Hall element Hn enters microprocessor system CPU through signal conversion process circuit XB, Hall element H0 is sleeved on the ground wire E0 of resistance R1 contact resistance R2, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R1, the signal end of Hall element H and Hall element H0 enters microprocessor system CPU through signal conversion process circuit XB.Voltage transformer (VT) star winding Y0 neutral point of voltage transformer cabinet circuit is connected voltage transformer secondary opening dihedral winding KV one end with voltage transformer secondary star winding y0 neutral point, voltage transformer (VT) common port V0 in coating-forming voltage mutual inductor cabinet PT, 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 on the static contact of disconnector QF1, disconnector GK three-phase moving contact end connects three heads of a voltage transformer (VT) star winding Y0 respectively, the neutral point of a voltage transformer (VT) star winding Y0 connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, three heads of voltage transformer secondary star winding y0 connect fuse RDa2 and fuse RDb2 and fuse RDc2 respectively, the neutral point of voltage transformer secondary star winding y0 connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, the other end of fuse RDa2 connects the normally closed contact of A phase voltage Table V a and resistance R3 and auxiliary reclay J, the other end of resistance R3 is connected auxiliary reclay KA with the other end of auxiliary reclay J normally closed contact, the other end of fuse RDb2 connects the normally closed contact of B phase voltage Table V b and resistance R4 and auxiliary reclay J, the other end of resistance R4 is connected auxiliary reclay KB with the other end of auxiliary reclay J normally closed contact, the other end of fuse RDc2 connects the normally closed contact of C phase voltage Table V c and resistance R5 and auxiliary reclay J, the other end of resistance R5 is connected auxiliary reclay KC with the other end of auxiliary reclay J normally closed contact, the other end of auxiliary reclay KA is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of auxiliary reclay KB and the other end of auxiliary reclay KC, the other end of A phase voltage Table V a is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of B phase voltage Table V b and the other end of C phase voltage Table V c, one end of voltage transformer secondary opening dihedral winding KV connects voltage transformer (VT) common port V0 and voltage relay KVJ in voltage transformer cabinet PT, the other end of voltage transformer secondary opening dihedral winding KV connects the other end of voltage relay KVJ.AC control circuit is that power firestreak L controls power light XD1 and time relay KT time delay disconnection normally closed contact through controlling power circuit breaker DK control linkage, the other end of the normally closed time delay break contact of time relay KT connects connection terminal L1, zero-power line N is through controlling power circuit breaker DK control linkage connection terminal N0, control the other end contact resistance R6 of power light XD1, the other end of resistance R6 connects connection terminal N0, one end of connection terminal L1 tie-time relay K T normally opened contact and auxiliary reclay Ja normally opened contact and auxiliary reclay Jb normally opened contact and the parallel connection of auxiliary reclay Jc normally opened contact, time relay KT normally opened contact and auxiliary reclay Ja normally opened contact and auxiliary reclay Jb normally opened contact are connected with the other end of auxiliary reclay Jc normally opened contact parallel connection and carry out detection pilot lamp XD2 and time relay KT and auxiliary reclay J1, carry out the other end contact resistance R7 detecting pilot lamp XD2, the other end of resistance R7 connects connection terminal N0, the other end of time relay KT connects connection terminal N0, the other end of auxiliary reclay J1 connects connection terminal N0, connection terminal L1 connects voltage relay KVJ normally opened contact, the other end of voltage relay KVJ normally opened contact connects auxiliary reclay KA normally closed contact and auxiliary reclay KB normally closed contact and auxiliary reclay KC normally closed contact and auxiliary reclay J, the other end of auxiliary reclay KA normally closed contact connects auxiliary reclay KA1, the other end of auxiliary reclay KB normally closed contact connects auxiliary reclay KB1, the other end of auxiliary reclay KC normally closed contact connects auxiliary reclay KC1, the other end of auxiliary reclay KA1 connects connection terminal N0, the other end of auxiliary reclay KB1 connects connection terminal N0, the other end of auxiliary reclay KC1 connects connection terminal N0, the other end of auxiliary reclay J connects connection terminal N0, connection terminal L1 connects auxiliary reclay KA1 normally opened contact and auxiliary reclay Ja normally opened contact and test button SBa, the other end of auxiliary reclay KA1 normally opened contact is all connected auxiliary reclay Jb normally closed contact with the other end of auxiliary reclay Ja normally opened contact together with the other end of test button SBa, auxiliary reclay Jb normally closed contact is connected one pole vacuum contactor KMa and auxiliary reclay Ja and A phase ground lamp XDa after connecting with auxiliary reclay Jc normally closed contact, the other end contact resistance R8 of one pole vacuum contactor KMa and auxiliary reclay Ja normally closed contact, resistance R8 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Ja normally closed contact, the other end of auxiliary reclay Ja connects connection terminal N0, the other end contact resistance R9 of A phase ground lamp XDa, the other end of resistance R9 connects connection terminal N0, connection terminal L1 connects auxiliary reclay KB1 normally opened contact and auxiliary reclay Jb normally opened contact and test button SBb, the other end of auxiliary reclay KB1 normally opened contact is all connected auxiliary reclay Ja normally closed contact with the other end of auxiliary reclay Jb normally opened contact together with the other end of test button SBb, auxiliary reclay Ja normally closed contact is connected one pole vacuum contactor KMb and auxiliary reclay Jb and B phase ground lamp XDb after connecting with auxiliary reclay Jc normally closed contact, the other end contact resistance R10 of one pole vacuum contactor KMb and auxiliary reclay Jb normally closed contact, resistance R10 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Jb normally closed contact, the other end of auxiliary reclay Jb connects connection terminal N0, the other end contact resistance R11 of B phase ground lamp XDb, the other end of resistance R11 connects connection terminal N0, connection terminal L1 connects auxiliary reclay KC1 normally opened contact and auxiliary reclay Jc normally opened contact and test button SBc, the other end of auxiliary reclay KC1 normally opened contact is all connected auxiliary reclay Ja normally closed contact with the other end of auxiliary reclay Jc normally opened contact together with the other end of test button SBc, auxiliary reclay Ja normally closed contact is connected one pole vacuum contactor KMc and auxiliary reclay Jc and C phase ground lamp XDc after connecting with auxiliary reclay Jb normally closed contact, the other end contact resistance R12 of one pole vacuum contactor KMc and auxiliary reclay Jc normally closed contact, resistance R12 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Jc normally closed contact, the other end of auxiliary reclay Jc connects connection terminal N0, the other end contact resistance R13 of C phase ground lamp XDc, the other end of resistance R13 connects connection terminal N0.Microprocessor system is that the ground signalling that single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit are measured is delivered to microprocessor system, through the position of microprocessor system CPU processes and displays ground connection, the signal end of Hall element H1 and Hall element Hn is connected to signal conversion process, the signal end of Hall element H and Hall element H0 is connected to signal conversion process circuit XB, the actuating signal of auxiliary reclay KA normally opened contact and auxiliary reclay KB normally opened contact and auxiliary reclay KC normally opened contact is connected to signal conversion process circuit XB, the position of microprocessor system CPU display earth fault is entered through signal conversion process circuit XB.Oscilloscope display system can directly observe line-to-ground situation, and oscillograph SBQ slotted line is connected to the two ends of resistance R1.
Claims (6)
1. single-phase earthing of small current earthing system DC detecting device, comprise the online feed circuit of direct current and single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit and AC control circuit and microprocessor system and oscilloscope display system, it is characterized in that connecting high voltage supply online circuit applying the automatic detection that DC low-voltage power supply carries out singlephase earth fault, avoid the impact of capacitance current, the online feed circuit of direct current are by fuse, one pole vacuum contactor, bridge rectifier, direct supply transformer, the compositions such as resistance, that high pressure A phase power source bus a connects fuse RDa1, high pressure B phase power source bus b connects fuse RDb1, high pressure C phase power source bus c connects fuse RDc1, fuse RDa1 other end connection one pole vacuum contactor KMa often leaves stationary contact, fuse RDb1 other end connection one pole vacuum contactor KMb often leaves stationary contact, fuse RDc1 other end connection one pole vacuum contactor KMc often leaves stationary contact, the contact end of often starting of one pole vacuum contactor KMa connects current-limiting resistance Ra, the contact end of often starting of one pole vacuum contactor KMb connects current-limiting resistance Rb, the contact end of often starting of one pole vacuum contactor KMc connects current-limiting resistance Rc, current-limiting resistance Ra and current-limiting resistance Rb and the other end of current-limiting resistance Rc are connected the positive supply output terminal of bridge rectifier Z together, the negative supply output terminal contact resistance R1 of bridge rectifier Z, the resistance R1 other end connects ground wire E0 and resistance R2 and relay J 1 normally closed contact, the other end of resistance R2 and relay J 1 normally closed contact connects voltage transformer cabinet PT voltage transformer (VT) winding star Y0 neutral point, direct supply transformer TB secondary winding connects the ac input end of bridge rectifier Z, direct supply transformer TB armature winding is through auxiliary reclay J1 normally opened contact control linkage AC power, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R1, Hall element H0 is sleeved on the ground wire E0 of resistance R1 contact resistance R2.
2. single-phase earthing of small current earthing system DC detecting device according to claim 1, comprise single-phase earthing signal acquisition circuit, it is characterized in that single-phase earthing signal acquisition circuit be multichannel high-voltage power supply circuit disconnector control after circuit on overlap Hall element, obtain single-phase earthing signal, first via feed circuit are 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 on the static contact of disconnector QF1, power supply user side is outputted to through Hall element H1 together with first via feed circuit A phase XLa1 and first via feed circuit B phase XLb1 and first via feed circuit C phase XLc1 tri-supply lines of disconnector QF1 three-phase moving contact end, n-th road feed circuit are 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 on the static contact of disconnector QFn, power supply user side is outputted to through Hall element Hn together with disconnector QFn three-phase moving contact Duan n-th road feed circuit A phase XLan and the n-th road feed circuit B phase XLbn and the n-th road feed circuit C phase XLcn tri-supply lines, the signal end of Hall element H1 and Hall element Hn enters microprocessor system CPU through signal conversion process circuit XB, Hall element H0 is sleeved on the ground wire E0 of resistance R1 contact resistance R2, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R1, the signal end of Hall element H and Hall element H0 enters microprocessor system CPU through signal conversion process circuit XB.
3. single-phase earthing of small current earthing system DC detecting device according to claim 1, comprise voltage transformer cabinet circuit, it is characterized in that voltage transformer (VT) star winding Y0 neutral point of voltage transformer cabinet circuit is connected voltage transformer secondary opening dihedral winding KV one end with voltage transformer secondary star winding y0 neutral point, voltage transformer (VT) common port V0 in coating-forming voltage mutual inductor cabinet PT, 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 on the static contact of disconnector QF1, disconnector GK three-phase moving contact end connects three heads of a voltage transformer (VT) star winding Y0 respectively, the neutral point of a voltage transformer (VT) star winding Y0 connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, three heads of voltage transformer secondary star winding y0 connect fuse RDa2 and fuse RDb2 and fuse RDc2 respectively, the neutral point of voltage transformer secondary star winding y0 connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, the other end of fuse RDa2 connects the normally closed contact of A phase voltage Table V a and resistance R3 and auxiliary reclay J, the other end of resistance R3 is connected auxiliary reclay KA with the other end of auxiliary reclay J normally closed contact, the other end of fuse RDb2 connects the normally closed contact of B phase voltage Table V b and resistance R4 and auxiliary reclay J, the other end of resistance R4 is connected auxiliary reclay KB with the other end of auxiliary reclay J normally closed contact, the other end of fuse RDc2 connects the normally closed contact of C phase voltage Table V c and resistance R5 and auxiliary reclay J, the other end of resistance R5 is connected auxiliary reclay KC with the other end of auxiliary reclay J normally closed contact, the other end of auxiliary reclay KA is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of auxiliary reclay KB and the other end of auxiliary reclay KC, the other end of A phase voltage Table V a is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of B phase voltage Table V b and the other end of C phase voltage Table V c, one end of voltage transformer secondary opening dihedral winding KV connects voltage transformer (VT) common port V0 and voltage relay KVJ in voltage transformer cabinet PT, the other end of voltage transformer secondary opening dihedral winding KV connects the other end of voltage relay KVJ.
4. single-phase earthing of small current earthing system DC detecting device according to claim 1, comprise AC control circuit, it is characterized in that AC control circuit is that power firestreak L controls power light XD1 and time relay KT time delay disconnection normally closed contact through controlling power circuit breaker DK control linkage, the other end of the normally closed time delay break contact of time relay KT connects connection terminal L1, zero-power line N is through controlling power circuit breaker DK control linkage connection terminal N0, control the other end contact resistance R6 of power light XD1, the other end of resistance R6 connects connection terminal N0, one end of connection terminal L1 tie-time relay K T normally opened contact and auxiliary reclay Ja normally opened contact and auxiliary reclay Jb normally opened contact and the parallel connection of auxiliary reclay Jc normally opened contact, time relay KT normally opened contact and auxiliary reclay Ja normally opened contact and auxiliary reclay Jb normally opened contact are connected with the other end of auxiliary reclay Jc normally opened contact parallel connection and carry out detection pilot lamp XD2 and time relay KT and auxiliary reclay J1, carry out the other end contact resistance R7 detecting pilot lamp XD2, the other end of resistance R7 connects connection terminal N0, the other end of time relay KT connects connection terminal N0, the other end of auxiliary reclay J1 connects connection terminal N0, connection terminal L1 connects voltage relay KVJ normally opened contact, the other end of voltage relay KVJ normally opened contact connects auxiliary reclay KA normally closed contact and auxiliary reclay KB normally closed contact and auxiliary reclay KC normally closed contact and auxiliary reclay J, the other end of auxiliary reclay KA normally closed contact connects auxiliary reclay KA1, the other end of auxiliary reclay KB normally closed contact connects auxiliary reclay KB1, the other end of auxiliary reclay KC normally closed contact connects auxiliary reclay KC1, the other end of auxiliary reclay KA1 connects connection terminal N0, the other end of auxiliary reclay KB1 connects connection terminal N0, the other end of auxiliary reclay KC1 connects connection terminal N0, the other end of auxiliary reclay J connects connection terminal N0, connection terminal L1 connects auxiliary reclay KA1 normally opened contact and auxiliary reclay Ja normally opened contact and test button SBa, the other end of auxiliary reclay KA1 normally opened contact is all connected auxiliary reclay Jb normally closed contact with the other end of auxiliary reclay Ja normally opened contact together with the other end of test button SBa, auxiliary reclay Jb normally closed contact is connected one pole vacuum contactor KMa and auxiliary reclay Ja and A phase ground lamp XDa after connecting with auxiliary reclay Jc normally closed contact, the other end contact resistance R8 of one pole vacuum contactor KMa and auxiliary reclay Ja normally closed contact, resistance R8 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Ja normally closed contact, the other end of auxiliary reclay Ja connects connection terminal N0, the other end contact resistance R9 of A phase ground lamp XDa, the other end of resistance R9 connects connection terminal N0, connection terminal L1 connects auxiliary reclay KB1 normally opened contact and auxiliary reclay Jb normally opened contact and test button SBb, the other end of auxiliary reclay KB1 normally opened contact is all connected auxiliary reclay Ja normally closed contact with the other end of auxiliary reclay Jb normally opened contact together with the other end of test button SBb, auxiliary reclay Ja normally closed contact is connected one pole vacuum contactor KMb and auxiliary reclay Jb and B phase ground lamp XDb after connecting with auxiliary reclay Jc normally closed contact, the other end contact resistance R10 of one pole vacuum contactor KMb and auxiliary reclay Jb normally closed contact, resistance R10 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Jb normally closed contact, the other end of auxiliary reclay Jb connects connection terminal N0, the other end contact resistance R11 of B phase ground lamp XDb, the other end of resistance R11 connects connection terminal N0, connection terminal L1 connects auxiliary reclay KC1 normally opened contact and auxiliary reclay Jc normally opened contact and test button SBc, the other end of auxiliary reclay KC1 normally opened contact is all connected auxiliary reclay Ja normally closed contact with the other end of auxiliary reclay Jc normally opened contact together with the other end of test button SBc, auxiliary reclay Ja normally closed contact is connected one pole vacuum contactor KMc and auxiliary reclay Jc and C phase ground lamp XDc after connecting with auxiliary reclay Jb normally closed contact, the other end contact resistance R12 of one pole vacuum contactor KMc and auxiliary reclay Jc normally closed contact, resistance R12 is connected connection terminal N0 with after the parallel connection of auxiliary reclay Jc normally closed contact, the other end of auxiliary reclay Jc connects connection terminal N0, the other end contact resistance R13 of C phase ground lamp XDc, the other end of resistance R13 connects connection terminal N0.
5. single-phase earthing of small current earthing system DC detecting device according to claim 1, comprise microprocessor system, it is characterized in that microprocessor system is that the ground signalling that single-phase earthing signal acquisition circuit and voltage transformer cabinet circuit are measured is delivered to microprocessor system, through the position of microprocessor system CPU processes and displays ground connection, the signal end of Hall element H1 and Hall element Hn is connected to signal conversion process, the signal end of Hall element H and Hall element H0 is connected to signal conversion process circuit XB, the actuating signal of auxiliary reclay KA normally opened contact and auxiliary reclay KB normally opened contact and auxiliary reclay KC normally opened contact is connected to signal conversion process circuit XB, the position of microprocessor system CPU display earth fault is entered through signal conversion process circuit XB.
6. single-phase earthing of small current earthing system DC detecting device according to claim 1, comprises oscilloscope display system, and it is characterized in that oscilloscope display system can directly observe line-to-ground situation, oscillograph SBQ slotted line is connected to the two ends of resistance R1.
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| CN201420452080.XU CN204241604U (en) | 2014-08-07 | 2014-08-07 | DC detecting device during single-phase earthing of small current earthing system |
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| CN201420452080.XU CN204241604U (en) | 2014-08-07 | 2014-08-07 | DC detecting device during single-phase earthing of small current earthing system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104133152A (en) * | 2014-08-07 | 2014-11-05 | 介国安 | Direct-current detection device for small-current grounding system in single-phase grounding process |
| CN106291318A (en) * | 2016-08-04 | 2017-01-04 | 中车戚墅堰机车有限公司 | Locomotive control loop ground detection device and control method thereof |
| CN108287306A (en) * | 2018-01-25 | 2018-07-17 | 国网江苏省电力有限公司徐州供电分公司 | Detection voltage transformer secondary air switch system and fault distinguishing method in real time |
| CN116973680A (en) * | 2023-07-21 | 2023-10-31 | 国网宁夏电力有限公司银川供电公司 | Low-current grounding line selection device, system and fault line investigation method |
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2014
- 2014-08-07 CN CN201420452080.XU patent/CN204241604U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104133152A (en) * | 2014-08-07 | 2014-11-05 | 介国安 | Direct-current detection device for small-current grounding system in single-phase grounding process |
| CN104133152B (en) * | 2014-08-07 | 2018-01-12 | 介国安 | DC detecting device during single-phase earthing of small current earthing system |
| CN106291318A (en) * | 2016-08-04 | 2017-01-04 | 中车戚墅堰机车有限公司 | Locomotive control loop ground detection device and control method thereof |
| 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 |
| CN108287306A (en) * | 2018-01-25 | 2018-07-17 | 国网江苏省电力有限公司徐州供电分公司 | Detection voltage transformer secondary air switch system and fault distinguishing method in real time |
| CN116973680A (en) * | 2023-07-21 | 2023-10-31 | 国网宁夏电力有限公司银川供电公司 | Low-current grounding line selection device, system and fault line investigation method |
| CN116973680B (en) * | 2023-07-21 | 2024-06-11 | 国网宁夏电力有限公司银川供电公司 | Low-current grounding line selection device, system and fault line investigation method |
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