CN104133152A - Direct-current detection device for small-current grounding system in single-phase grounding process - Google Patents
Direct-current detection device for small-current grounding system in single-phase grounding process Download PDFInfo
- Publication number
- CN104133152A CN104133152A CN201410396988.8A CN201410396988A CN104133152A CN 104133152 A CN104133152 A CN 104133152A CN 201410396988 A CN201410396988 A CN 201410396988A CN 104133152 A CN104133152 A CN 104133152A
- Authority
- CN
- China
- Prior art keywords
- auxiliary reclay
- contact
- phase
- connects
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 230000007935 neutral effect Effects 0.000 claims description 17
- 230000003068 static effect Effects 0.000 claims description 9
- 230000011664 signaling Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a direct-current detection device for a small-current grounding system in the single-phase grounding process, and relates to the technical field of small-current grounding detection. The direct-current detection device is used for automatically detecting the single-phase grounding fault of a direct-current low-voltage power source exerted on a high-voltage power supply online circuit, the influence of the current of a distributive capacitor is avoided, when the grounding fault happens to any power supply circuit, the balance of a primary star winding Y0 of a voltage transformer of a voltage transformer cabinet PT can be lost, voltage relays KVJ at the two ends of a secondary opening angular winding KV of a voltage transformer are closed, automatic detection is begun, signals sent out by a Hall sensor H1, a Hall sensor Hn, a Hall sensor H and a Hall sensor H0 enter a signal transformation processing circuit XB, the signals are determined by the signal transformation processing circuit XB and then enter a microcomputer processing system CPU for performing fault current detection and analysis, and an oscilloscope SEQ detects waveforms at the two ends of a detection resistor R1. The automatic detection device for the single-phase grounding fault of the small-current grounding system can be provided, can meet safety requirements, is clear in principle, safe, reliable and accurate in detection, and can be widely applied to a power supply system .
Description
Technical field:
The present invention relates to small current neutral grounding detection technique field, particularly direct current pick-up unit when 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 as early as possible faulty line and excise it.But the zero-sequence current Small Electric Current Earthing And Routing Device adopting is for a long time because of the uncertainty of capacitance current, and route selection effect is undesirable, sometimes even can report by mistake, and it is passive greatly to cause to production.
Summary of the invention:
The object of the invention is for above-mentioned defect, avoid the impact of capacitance current, change the deficiency of zero-sequence current line selection apparatus, that high voltage supply online circuit is applied to DC low-voltage power supply and carry out the automatic detection of singlephase earth fault, object be to provide a kind of meet safety requirements, principle clear, safe and reliable, detect the automatic detection device of single-phase grounded malfunction in grounded system of low current accurately.
Technical scheme of the present invention is single-phase earthing of small current earthing system direct current pick-up unit, 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 high voltage supply online circuit to connect and apply DC low-voltage power supply and carry out the automatic detection of 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, what the fuse RDa1 other end connected one pole vacuum contactor KMa often opens stationary contact, what the fuse RDb1 other end connected one pole vacuum contactor KMb often opens stationary contact, what the fuse RDc1 other end connected one pole vacuum contactor KMc often opens 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 the other end of current-limiting resistance Rb and 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, resistance R 1 other end connects ground wire E0 and resistance R 2 and relay J 1 normally closed contact, the other end of resistance R 2 and relay J 1 normally closed contact connects winding star Y0 neutral point of voltage transformer cabinet PT voltage transformer (VT), 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 R 1, Hall element H0 is sleeved on the ground wire E0 of resistance R 1 contact resistance R2.
Described single-phase earthing of small current earthing system direct current pick-up unit, comprise single-phase earthing signal acquisition circuit, it is characterized in that single-phase earthing signal acquisition circuit is to put Hall element on the circuit after the control of multichannel high-voltage power supply circuit disconnector, 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, together with tri-supply lines of the first via feed circuit A phase XLa1 of disconnector QF1 three-phase moving contact end and first via feed circuit B phase XLb1 and first via feed circuit C phase XLc1, output to power supply user side through Hall element H1, n 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, together with tri-supply lines of n road feed circuit A phase XLan and n road feed circuit B phase XLbn and n road feed circuit C phase XLcn of disconnector QFn three-phase moving contact end, output to power supply user side through Hall element Hn, 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 R 1 contact resistance R2, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R 1, 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 direct current pick-up unit, comprise voltage transformer cabinet circuit, the star winding Y0 neutral point of voltage transformer (VT) that it is characterized in that voltage transformer cabinet circuit is connected voltage transformer secondary opening dihedral winding KV one end with voltage transformer secondary star winding y0 neutral point, form voltage transformer (VT) common port V0 in voltage transformer 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 respectively three statures of a star winding Y0 of voltage transformer (VT), the neutral point of a star winding Y0 of voltage transformer (VT) connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, three statures of voltage transformer secondary star winding y0 connect respectively fuse RDa2 and fuse RDb2 and fuse RDc2, 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 R 3 and auxiliary reclay J, the other end of resistance R 3 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 R 4 and auxiliary reclay J, the other end of resistance R 4 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 R 5 and auxiliary reclay J, the other end of resistance R 5 is connected auxiliary reclay KC with the other end of auxiliary reclay J normally closed contact, the other end of the other end of auxiliary reclay KA and auxiliary reclay KB is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of auxiliary reclay KC, the other end of the other end of A phase voltage Table V a and B phase voltage Table V b is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with 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 direct current pick-up unit, comprise AC control circuit, it is characterized in that AC control circuit is that power firestreak L disconnects normally closed contact through controlling power circuit breaker DK control linkage control power light XD1 and time relay KT time delay, 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 R 6 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 is connected and detects pilot lamp XD2 and time relay KT and auxiliary reclay J1 with the other end of auxiliary reclay Jc normally opened contact parallel connection with auxiliary reclay Jb normally opened contact with auxiliary reclay Ja normally opened contact, detect the other end contact resistance R7 of pilot lamp XD2, the other end of resistance R 7 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 together with the other end of auxiliary reclay Ja normally opened contact and 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 with after the series connection of 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 R 8 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 R 9 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 together with the other end of auxiliary reclay Jb normally opened contact and 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 with after the series connection of auxiliary reclay Jc normally closed contact, one pole vacuum contactor KMb, other end contact resistance R10 and auxiliary reclay Jb normally closed contact, resistance R 10 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 R 11 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 together with the other end of auxiliary reclay Jc normally opened contact and 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 with after the series connection of 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 R 12 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 R 13 connects connection terminal N0.
Described single-phase earthing of small current earthing system direct current pick-up unit, 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, through signal conversion process circuit, XB enters the position that microprocessor system CPU shows earth fault.
Described single-phase earthing of small current earthing system direct current pick-up unit, comprises oscilloscope display system, it is characterized in that oscilloscope display system can directly observe line-to-ground situation, and oscillograph SBQ slotted line is connected to the two ends of resistance R 1.
The present invention applies DC low-voltage power supply to high voltage supply online circuit to carry out the automatic detection of singlephase earth fault, avoid the impact of capacitance current, change the deficiency of zero-sequence current line selection apparatus, the invention provides a kind of meet safety requirements, principle clear, safe and reliable, detect the automatic detection device of single-phase grounded malfunction in grounded system of low current accurately, can be widely used in electric power system.
Brief description of the drawings
Fig. 1 single-phase earthing of small current earthing system direct current pick-up unit main circuit control circuit schematic diagram
Fig. 2 single-phase earthing of small current earthing system direct current pick-up unit 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, star winding of Y0 voltage transformer (VT), 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 detects 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 road feed circuit A phase, XLbn n road feed circuit B phase, XLcn n 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 direct current pick-up unit main circuit control circuit schematic diagram, and Fig. 2 is single-phase earthing of small current earthing system direct current pick-up unit control relay circuit schematic diagram.Principle of work is: under normal circumstances in Fig. 2 all relays all in disconnect off position, control power light XD1 bright, in Fig. 1, direct supply transformer TB and bridge rectifier Z are also in disconnecting off position, and Hall element H, Hall element H0, Hall element H1 and Hall element Hn do not have fault-signal.Illustrate the principle of work while breaking down, there is ground connection in fault ground point D place for example, and first via feed circuit A phase XLa1 ground connection is described.In the time that ground connection occurs, there is three-phase imbalance in first via feed circuit, Hall element H1 sends signal entering signal conversion process circuit XB, star winding Y0 out of trim of voltage transformer (VT) of voltage transformer cabinet PT simultaneously, make voltage transformer secondary opening dihedral winding KV two ends produce voltage, voltage relay KVJ adhesive, voltage relay KVJ normally opened contact closure, auxiliary reclay J adhesive, resistance 3, resistance 4, resistance 5 is protected respectively KA auxiliary reclay, 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 closure simultaneously, auxiliary reclay KA1 adhesive, auxiliary reclay KA1 normally opened contact closure, auxiliary reclay Ja and one pole vacuum contactor KMa adhesive, it is bright that XD2 detects 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 closure, resistance R 2 can reduce the impact of DC current on voltage transformer cabinet PT, one pole vacuum contactor KMa normally opened contact closure 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 gather fault current signal when single-phase earthing, the signal of Hall element H1 has determined that first via feed circuit have earth fault, auxiliary reclay KA normally opened contact disconnects having determined it is A phase ground connection, determine that by signal conversion process circuit XB the laggard microprocessor system CPU of entering carries out fault current detection analysis, oscillograph SBQ is the waveform that detects resistance R 1 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 finishes, 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 respectively three phase supply circuit at any time.
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, what the fuse RDa1 other end connected one pole vacuum contactor KMa often opens stationary contact, what the fuse RDb1 other end connected one pole vacuum contactor KMb often opens stationary contact, what the fuse RDc1 other end connected one pole vacuum contactor KMc often opens 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 the other end of current-limiting resistance Rb and 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, resistance R 1 other end connects ground wire E0 and resistance R 2 and relay J 1 normally closed contact, the other end of resistance R 2 and relay J 1 normally closed contact connects winding star Y0 neutral point of voltage transformer cabinet PT voltage transformer (VT), 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 R 1, Hall element H0 is sleeved on the ground wire E0 of resistance R 1 contact resistance R2.Single-phase earthing signal acquisition circuit is to put Hall element on the circuit after the control of multichannel high-voltage power supply circuit disconnector, 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, together with tri-supply lines of the first via feed circuit A phase XLa1 of disconnector QF1 three-phase moving contact end and first via feed circuit B phase XLb1 and first via feed circuit C phase XLc1, output to power supply user side through Hall element H1, n 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, together with tri-supply lines of n road feed circuit A phase XLan and n road feed circuit B phase XLbn and n road feed circuit C phase XLcn of disconnector QFn three-phase moving contact end, output to power supply user side through Hall element Hn, 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 R 1 contact resistance R2, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R 1, the signal end of Hall element H and Hall element H0 enters microprocessor system CPU through signal conversion process circuit XB.Star winding Y0 neutral point of voltage transformer (VT) 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, form voltage transformer (VT) common port V0 in voltage transformer 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 respectively three statures of a star winding Y0 of voltage transformer (VT), the neutral point of a star winding Y0 of voltage transformer (VT) connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, three statures of voltage transformer secondary star winding y0 connect respectively fuse RDa2 and fuse RDb2 and fuse RDc2, 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 R 3 and auxiliary reclay J, the other end of resistance R 3 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 R 4 and auxiliary reclay J, the other end of resistance R 4 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 R 5 and auxiliary reclay J, the other end of resistance R 5 is connected auxiliary reclay KC with the other end of auxiliary reclay J normally closed contact, the other end of the other end of auxiliary reclay KA and auxiliary reclay KB is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of auxiliary reclay KC, the other end of the other end of A phase voltage Table V a and B phase voltage Table V b is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with 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 disconnects normally closed contact through controlling power circuit breaker DK control linkage control power light XD1 and time relay KT time delay, 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 R 6 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 is connected and detects pilot lamp XD2 and time relay KT and auxiliary reclay J1 with the other end of auxiliary reclay Jc normally opened contact parallel connection with auxiliary reclay Jb normally opened contact with auxiliary reclay Ja normally opened contact, detect the other end contact resistance R7 of pilot lamp XD2, the other end of resistance R 7 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 together with the other end of auxiliary reclay Ja normally opened contact and 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 with after the series connection of 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 R 8 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 R 9 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 together with the other end of auxiliary reclay Jb normally opened contact and 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 with after the series connection of 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 R 10 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 R 11 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 together with the other end of auxiliary reclay Jc normally opened contact and 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 with after the series connection of 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 R 12 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 R 13 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, through signal conversion process circuit, XB enters the position that microprocessor system CPU shows earth fault.Oscilloscope display system can directly be observed line-to-ground situation, and oscillograph SBQ slotted line is connected to the two ends of resistance R 1.
Claims (6)
1. single-phase earthing of small current earthing system direct current pick-up unit, 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 high voltage supply online circuit to connect and apply DC low-voltage power supply and carry out the automatic detection of 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, what the fuse RDa1 other end connected one pole vacuum contactor KMa often opens stationary contact, what the fuse RDb1 other end connected one pole vacuum contactor KMb often opens stationary contact, what the fuse RDc1 other end connected one pole vacuum contactor KMc often opens 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 the other end of current-limiting resistance Rb and 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, resistance R 1 other end connects ground wire E0 and resistance R 2 and relay J 1 normally closed contact, the other end of resistance R 2 and relay J 1 normally closed contact connects winding star Y0 neutral point of voltage transformer cabinet PT voltage transformer (VT), 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 R 1, Hall element H0 is sleeved on the ground wire E0 of resistance R 1 contact resistance R2.
2. single-phase earthing of small current earthing system direct current pick-up unit according to claim 1, comprise single-phase earthing signal acquisition circuit, it is characterized in that single-phase earthing signal acquisition circuit is to put Hall element on the circuit after the control of multichannel high-voltage power supply circuit disconnector, 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, together with tri-supply lines of the first via feed circuit A phase XLa1 of disconnector QP1 three-phase moving contact end and first via feed circuit B phase XLb1 and first via feed circuit C phase XLc1, output to power supply user side through Hall element H1, n 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, together with tri-supply lines of n road feed circuit A phase XLan and n road feed circuit B phase XLbn and n road feed circuit C phase XLcn of disconnector QFn three-phase moving contact end, output to power supply user side through Hall element Hn, 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 R 1 contact resistance R2, Hall element H is sleeved on the connecting line between ground wire E0 and resistance R 1, 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 direct current pick-up unit according to claim 1, comprise voltage transformer cabinet circuit, the star winding Y0 neutral point of voltage transformer (VT) that it is characterized in that voltage transformer cabinet circuit is connected voltage transformer secondary opening dihedral winding KV one end with voltage transformer secondary star winding y0 neutral point, form voltage transformer (VT) common port V0 in voltage transformer 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 respectively three statures of a star winding Y0 of voltage transformer (VT), the neutral point of a star winding Y0 of voltage transformer (VT) connects voltage transformer (VT) common port V0 in voltage transformer cabinet PT, three statures of voltage transformer secondary star winding y0 connect respectively fuse RDa2 and fuse RDb2 and fuse RDc2, 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 R 3 and auxiliary reclay J, the other end of resistance R 3 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 R 4 and auxiliary reclay J, the other end of resistance R 4 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 R 5 and auxiliary reclay J, the other end of resistance R 5 is connected auxiliary reclay KC with the other end of auxiliary reclay J normally closed contact, the other end of the other end of auxiliary reclay KA and auxiliary reclay KB is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with the other end of auxiliary reclay KC, the other end of the other end of A phase voltage Table V a and B phase voltage Table V b is all connected voltage transformer (VT) common port V0 in voltage transformer cabinet PT with 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 direct current pick-up unit according to claim 1, comprise AC control circuit, it is characterized in that AC control circuit is that power firestreak L disconnects normally closed contact through controlling power circuit breaker DK control linkage control power light XD1 and time relay KT time delay, 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 R 6 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 is connected and detects pilot lamp XD2 and time relay KT and auxiliary reclay J1 with the other end of auxiliary reclay Jc normally opened contact parallel connection with auxiliary reclay Jb normally opened contact with auxiliary reclay Ja normally opened contact, detect the other end contact resistance R7 of pilot lamp XD2, the other end of resistance R 7 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 together with the other end of auxiliary reclay Ja normally opened contact and 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 with after the series connection of 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 R 8 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 R 9 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 together with the other end of auxiliary reclay Jb normally opened contact and 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 with after the series connection of 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 R 10 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 R 11 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 together with the other end of auxiliary reclay Jc normally opened contact and 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 with after the series connection of 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 R 12 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 R 13 connects connection terminal N0.
5. single-phase earthing of small current earthing system direct current pick-up unit 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, through signal conversion process circuit, XB enters the position that microprocessor system CPU shows earth fault.
6. single-phase earthing of small current earthing system direct current pick-up unit according to claim 1, comprises oscilloscope display system, it is characterized in that oscilloscope display system can directly observe line-to-ground situation, and oscillograph SBQ slotted line is connected to the two ends of resistance R 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410396988.8A CN104133152B (en) | 2014-08-07 | 2014-08-07 | DC detecting device during single-phase earthing of small current earthing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410396988.8A CN104133152B (en) | 2014-08-07 | 2014-08-07 | DC detecting device during single-phase earthing of small current earthing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104133152A true CN104133152A (en) | 2014-11-05 |
| CN104133152B CN104133152B (en) | 2018-01-12 |
Family
ID=51805899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410396988.8A Expired - Fee Related CN104133152B (en) | 2014-08-07 | 2014-08-07 | DC detecting device during single-phase earthing of small current earthing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104133152B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN110231540A (en) * | 2019-06-04 | 2019-09-13 | 西安交通大学 | One kind is for pseudo- bipolar DC electric line monopolar grounding fault positioning system |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050962A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Grounding transfer current detection compensation device and working method thereof |
| CN203054156U (en) * | 2012-11-30 | 2013-07-10 | 安徽省电力公司芜湖供电公司 | Power distribution network single phase grounding fault positioning device based on direct current signal detector |
| CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
| CN203645320U (en) * | 2013-12-10 | 2014-06-11 | 河北伟正电力技术有限公司 | Active voltage-regulating type arc extinction voltage-limiting protection device used for low-current grounding system |
| CN204241604U (en) * | 2014-08-07 | 2015-04-01 | 介国安 | DC detecting device during single-phase earthing of small current earthing system |
-
2014
- 2014-08-07 CN CN201410396988.8A patent/CN104133152B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050962A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Grounding transfer current detection compensation device and working method thereof |
| CN203054156U (en) * | 2012-11-30 | 2013-07-10 | 安徽省电力公司芜湖供电公司 | Power distribution network single phase grounding fault positioning device based on direct current signal detector |
| CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
| CN203645320U (en) * | 2013-12-10 | 2014-06-11 | 河北伟正电力技术有限公司 | Active voltage-regulating type arc extinction voltage-limiting protection device used for low-current grounding system |
| CN204241604U (en) * | 2014-08-07 | 2015-04-01 | 介国安 | DC detecting device during single-phase earthing of small current earthing system |
Non-Patent Citations (1)
| Title |
|---|
| 程路等: "小电流接地系统单相接地选线技术综述", 《电网技术》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN110231540A (en) * | 2019-06-04 | 2019-09-13 | 西安交通大学 | One kind is for pseudo- bipolar DC electric line monopolar grounding fault positioning system |
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104133152B (en) | 2018-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204241604U (en) | DC detecting device during single-phase earthing of small current earthing system | |
| CN104678260A (en) | System and method for single-phase grounding line selection of small current grounding system | |
| CN104133152A (en) | Direct-current detection device for small-current grounding system in single-phase grounding process | |
| CN103792505A (en) | Ground fault simulation device for electric power direct current system | |
| CN204012685U (en) | A kind of 10kV electrical network earth fault treatment facility | |
| CN203180518U (en) | Intelligent switch arc-extinguishing and overvoltage-protecting device | |
| CN105717426A (en) | Insulation monitoring device and method capable of preventing buses from misoperation | |
| CN106814279A (en) | Line-selected earthing device | |
| CN110535116B (en) | Arc extinction cabinet and low-current grounding system | |
| CN210608530U (en) | Arc suppression cabinet and small current grounding system | |
| CN103050960B (en) | Pulse selection coil compensating and failure processing device and working method thereof | |
| CN102707206B (en) | Reclosure device for insulation detection | |
| CN106257782B (en) | Ac leakage drives protector | |
| CN105914723B (en) | The switching device of residual current circuit breaker | |
| CN203368013U (en) | Protection device for residual voltage of bus | |
| CN106877307A (en) | Sofe Switch arc-extinction device | |
| Venkata et al. | Advanced and adaptive protection for active distribution grid | |
| CN104483605A (en) | High-voltage motor insulation detector | |
| CN212323701U (en) | Novel differential line selection comprehensive grounding protection device | |
| CN103018631A (en) | System for 10kV fault line detection | |
| CN107230967A (en) | voltage transformer secondary neutral point potential drift monitoring method | |
| CN106972462A (en) | Low-voltage distribution cabinet broken neutral line protection device and detection method | |
| CN206559041U (en) | Sofe Switch arc-extinction device | |
| CN103311881A (en) | Over-current protection device and method | |
| CN205941814U (en) | Experimental auxiliary device of isolator short circuit making |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
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 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180112 |