CN102437548A - Zero-residual-current circuit protection method and residual-current protection circuit breaker using same - Google Patents
Zero-residual-current circuit protection method and residual-current protection circuit breaker using same Download PDFInfo
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Abstract
The invention discloses a zero-residual-current protection method and a residual-current protection circuit breaker using the same. The method comprises the following measures: a primary winding passing through a current transformer of the residual-current protection circuit breaker is respectively equipped with a resistive alternating current (AC) compensating branch circuit and a capacitive AC compensating branch circuit so that load current and AC compensating current flow through the primary winding; the primary winding passing through the current transformer of the residual-current protection circuit breaker is also equipped with a direct current (DC) compensating circuit so that load current and DC compensating current flow through the primary winding; and residual current is displayed according to grades by a display device, and the residual current of the current transformer is kept to be zero by a compensating current adjustor. In the invention, by means of trial switching-in operation of the residual-current protection circuit breaker, the size and property of the needed compensating current are judged, and the compensating current is preset; and after switching-in operation, the size of the compensating current is further adjusted according to residual-current display so that the residual-current protection circuit breaker can realize normal power supply under the condition of zero residual AC and DC.
Description
Technical field
The invention belongs to the reliable and safety control technology field of electricity consumption that supplies; Further belong to the residual current protecting technical field, be specifically related to a kind of zero method for protecting residual current and residual current protecting circuit breaker thereof of technological deficiency of the three-level protective system that can overcome existing power supply transformer neutral point grounding system.
Background technology
In the power transformer earth neutral system; The residual current protecting circuit breaker (is also claimed residual current operated protective device; Or steelyard slepsydra electric protection circuit breaker) at the beginning of the design; Less than its operating current, perhaps is zero based on the resistive on the electricity consumption line phase and capacitive character leakage current, and what cause the protector action must be the fault leakage current.But in fact; Normal leakage current on the phase line; The leakage current that perhaps can keep the using electricity system operate as normal maybe be bigger than non-operating current
; Though can normal power supply; But leakage current is near operating current
; Cause the antijamming capability of residual current protecting circuit breaker very poor, very easily produce misoperation.If normal leakage current causes closing not brake application greater than operating current
.
Also there is overstep tripping in existing Aftercurrent protecting equipment, causes the large-area power-cuts problem.The residual current protecting circuit breaker action (being called overstep tripping) that causes upper level or go up two-stage; Minimum even one-level residual current protecting circuit breaker is not action also; The regular reason that the residual current protecting circuit breaker of upper level or last two-stage has moved is; Although the residual current protecting circuit breaker of upper level or last two-stage ability normal power supply; But its residual current has surpassed
electric current and near operating current
of being failure to actuate; In case the electric leakage less than the operating current of next stage residual current protecting circuit breaker takes place in its supply district; The not action of residual current protecting circuit breaker of next stage will occur, be upper level or the residual current protecting circuit breaker action of going up two-stage on the contrary.Residual current when perhaps working owing to the residual current protecting circuit breaker of upper level or last two-stage is above non-operating current
and near operating current
; In case be interfered; Being failure to actuate of the last grade, its higher level's residual current protecting circuit breaker action.Although usually equipped with a residual current circuit breaker on the operating current
greater than under a residual current circuit breaker operating current
.Have only when the residual current of all residual current protecting circuit breakers of three grades during at normal power supply is all zero, just can not affirm overstep tripping to occur.
Also there is the problem of refusing (cutting off) action in existing Aftercurrent protecting equipment.Except the tripping work that undesired uses such as iterative earthing cause, also have a kind of situation to be, contain DC component in the residual current, the sensitivity of residual current protecting circuit breaker is reduced greatly, lose the earth leakage protective effect.
The appearance of above-mentioned variety of problems; Produce desire and changed the neutral point of power transformer into earth-free motion (" investigation of low voltage electric network problem with grounding " 2008 International Conference on Electricity Distribution papers by ground connection; " low-voltage electrical apparatus " 2010 No.3 are in generation root etc.); Shake the execution of GB, explain that this is a major issue that receives much concern.
With regard to the solution of this problem, the inventor retrieves 2004 " colliery is dynamo-electric " the 31st page of the third phase " based on the mine high-voltage fence leakage protection system of current compensational method ".One Chinese patent application (201010244560.3) " based on the earth leakage protection method for ship network of capacitance current time domain compensation ".There is significant limitation in the application of above-mentioned two kinds of current compensation methods: the one, only be used in the power transformer isolated neutral system, and the 2nd, only be used on the secondary side signal processing of current transformer.
One Chinese patent application (201110310203.3) has adopted the method for alternating current compensation; The method of offset current is used on the winding of current transformer; Can make the residual current protecting circuit breaker that normal leakage current is being arranged, make it close the not occasion of brake application, lock can close.But two defectives are arranged: the one, although closed lock, possibly make its residual current be in critical condition, there is interference just to produce misoperation slightly.The 2nd, the DC component in the residual current in the residual current transformer is not compensated.A lot of rectification frequency conversion equipments are arranged in the present power consumption equipment, and these equipment cause residual current to have DC component easily, make the magnetic circuit of current transformer get into direct current magnetic saturation state, and then make the residual current protecting circuit breaker produce the tripping work.
Also have a lot of patented technologies to attempt to solve the technological deficiency that prior art exists; But aspect the antijamming capability that solves the residual current protecting circuit breaker; Nearly all be to solve the misoperation problem of residual current protecting circuit breaker, and be on the signal of the secondary side of residual current transformer, to handle through the way that manually or automatically increases operating current
.Because residual current transformer core material magnetic conductivity the subject of knowledge and the object of knowledge limit, core material can not be at very high residual current, under the condition of very high residual magnetic flux density, can also have the permeance of residual current when equalling zero.Therefore solve the misoperation problem with improving the residual current acting value, the existing technical risk that causes tripping to do receives the restriction of magnetic material magnetic property and magnetic core size again, can not tackle the problem at its root.
In order well to solve safety utilization of electric power and reliable power supply; Be necessary to solve at low cost the alternating current-direct current residual current of residual current protecting circuit breaker when normal power supply and be all zero problem; Only so; Can guarantee that just the residual current protecting circuit breaker has very high antijamming capability, solve the misoperation problem, solve a kind of tripping that causes magnetic saturation to produce because of the direct current flux in the magnetic core simultaneously and make problem.
Summary of the invention
First purpose of the present invention is to provide a kind of residual current protecting circuit breaker that makes when operate as normal; Residue alternating current in the residual current transformer, residue exchange flux are zero or approach zero; Having under the situation of normal leakage current; Improve its antijamming capability greatly, guarantee not take place the zero method for protecting residual current of misoperation.
Second purpose of the present invention is to provide a kind of simple in structure, and working stability is reliable, realizes interchange, direct current residual current double compensation, does not produce the residual current protecting circuit breaker based on zero residual current protection circuit method that misoperation and tripping are done.
First purpose of the present invention is achieved in that residual current transformer is set on the power supply circuits that the residual current transformer coil comprises following measures through the tripping mechanism linked circuit breaker:
A, a winding that passes the current transformer of residual current protecting circuit breaker are provided with resistive AC compensation branch road and capacitive character AC compensation branch road respectively, make winding of current transformer not only flow through load current but also flow through the AC compensation electric current;
B, pass the residual current protecting circuit breaker another winding of current transformer through DC offset circuit is set, make a winding not only flow through load current but also flow through the DC compensation electric current;
A winding that flows through offset current of C, described current transformer can any phase line and/or the zero line that penetrates current transformer core of dual-purpose; Or a section lead that penetrates in addition formation current transformer; Except that zero line and all phase lines, has another winding that flows through offset current of electrical isolation effect;
The residual current of D, residual current transformer shows through the display device stepping, regulates offset current through adjuster according to demonstration residual current size, residual current is adjusted to approached zero;
E, described offset current are regulated through resistive AC compensation branch road and capacitive character AC compensation branch road and are regulated realization, perhaps realize through the offset supply voltage-regulation.
Second purpose of the present invention is achieved in that and comprises residual current transformer, AC compensating network, DC offset circuit, residual current signal processor, tripping mechanism; Circuit breaker; The residual current induction coil electrically connects the residual current signal processor on the residual current transformer; Residual current signal processor output and tripping mechanism connect; Tripping mechanism and circuit breaker are linked, and described AC compensating network comprises resnstance transformer branch road and capacitance compensation branch road, and both parallel connection backs are passed residual current transformer and are connected with the AC compensation power supply through exchanging a winding; Described DC offset circuit comprises DC compensation power supply and compensating resistance, and both connect after passing residual current transformer through winding of direct current each other.
The present invention makes the residual current mutual inductance when operate as normal through direct current and alternating current compensation, has not both had remaining alternating current, does not also have remaining direct current.The present invention is through examination compensating direct current electric current; Observe the variation that the residue alternating current shows, whether decision carries out the direct current compensation, if need compensation; Further determine the size of DC compensation electric current, making the residue direct current of residual current protecting circuit breaker when normal power supply is zero.Can either guarantee the sensitivity of protector, can guarantee its antijamming capability again, significantly reduce the situation generation that misoperation and tripping are done.
Description of drawings
Schematic diagram when Fig. 1 implements in single-phase-two-wire system circuit for the present invention.
Among the figure: 1-resistor branch road, 2-capacitor branch road, 3-AC compensation power supply; A flow through section lead of a winding of residual current transformer of a flow through section lead of a winding of residual current transformer of 4-direct current compensation circuit, 5-AC compensation electric current, 6-DC compensation electric current; 7-leakage current stepping light-emitting diode display and toggle switch, 8-residual current transformer, 9-Current Transformer Secondary side signal processing unit; 10-takes off mouth mechanism, the 11-killer switch.
Fig. 2 can accomplish that for the present invention the residue AC and DC electric current in the residual current transformer is zero, and the dc point A on the B of residual current transformer magnetic core ~ H curve and the close excursion a of AC magnetism ~ b be the situation on zero point.Residual AC current
In the residual current transformer secondary side AC voltage generated
.The residue alternating current reaches the operating current
of residual current protecting circuit breaker; The voltage magnitude that produces at secondary side be
, the non-operating current
that the residue alternating current reaches the residual current protecting circuit breaker secondary side produce voltage magnitude is
.GB regulations
is
twice.Can know by figure; Its antijamming capability has
size of twice from 0 ~
.
Fig. 3 is that commercially available residual current protecting circuit breaker is when normal power supply; Dc point A (zero point) on the B of residual current transformer magnetic core ~ H curve; Because the amplitude that normal leakage current arranged is during near non-operating current
; The close excursion of AC magnetism is from a ~ b of magnetization curve; Antijamming capability to
, has only the size of a times
from
.
When there is direct current in Fig. 4 for the current transformer core in the commercially available residual current protecting circuit breaker; When making the direct current flux working point of magnetic core move on to the A point the figure from zero point; When residual current reaches the amplitude identical with Fig. 3, the situation that the voltage amplitude that produces in the Current Transformer Secondary side obviously reduces.At this moment; Even residual current surpasses
; The residual current protecting circuit breaker can not move yet, the situation that a kind of tripping that Here it is is done.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described, but never in any form the present invention is limited, any conversion based on training centre of the present invention is done all falls into protection scope of the present invention.
As shown in Figure 1, the present invention's zero residual current protection circuit method is provided with residual current transformer on the power supply circuits, and the residual current transformer coil is characterized in that: comprise following measures through the tripping mechanism power supply circuits circuit breaker that is linked:
A, a winding that passes the current transformer of residual current protecting circuit breaker are provided with resistive AC compensation branch road and capacitive character AC compensation branch road respectively, make winding of current transformer not only flow through load current but also flow through the AC compensation electric current;
B, pass the residual current protecting circuit breaker another winding of current transformer through DC offset circuit is set, make a winding not only flow through load current but also flow through the DC compensation electric current;
A winding that flows through offset current of C, described current transformer can any phase line and/or the zero line that penetrates current transformer core of dual-purpose; Or a section lead that penetrates in addition formation current transformer; Except that zero line and all phase lines, has another winding that flows through offset current of electrical isolation effect;
The residual current of D, residual current transformer shows through the display device stepping, regulates offset current through adjuster according to demonstration residual current size, residual current is adjusted to approached zero;
E, described offset current are regulated through resistive AC compensation branch road and capacitive character AC compensation branch road and are regulated realization, perhaps realize through the offset supply voltage-regulation.
Described adjusting is through the adjustment offset current, makes remaining ac and dc current in the residual current protecting circuit breaker Current Transformer when operate as normal, always remain zero or approach zero.
Described adjusting is control capacittance property compensation branch road, resistive compensation branch road or DC compensation loop, to keep the size of normal leakage current under the reliable condition of power supply, presets offset current through toggle switch, and lock is advisable closing; Close behind the lock, according to showing leakage current on the display device, further regulate offset current through toggle switch, the residue ac and dc current when making its operate as normal is zero.
Compensating direct current electric current in the current transformer winding makes the residue direct current near zero, keeps the sensitivity of its protection, reduces tripping to greatest extent and does.
Residual current protecting circuit breaker of the present invention; Comprise residual current transformer (8), AC compensating network, DC offset circuit, residual current signal processor (9), take off mouth mechanism (10); Circuit breaker (11); Residual current transformer (8) is gone up the residual current induction coil and is electrically connected residual current signal processor (9); Residual current signal processor (9) output and uncoupling rigging (10) connect; Uncoupling rigging (10) is linked with circuit breaker (11), and it is characterized in that: described AC compensating network comprises resnstance transformer branch road (1) and capacitance compensation branch road (2), and both parallel connection backs are passed residual current transformer (8) through a winding of interchange (5) and are connected with AC compensation power supply (3); Described DC offset circuit comprises DC compensation power supply (4) and compensating resistance, and both connect after passing residual current transformer (8) through a winding of direct current (6) each other.
On the described residual current circuit display device is set.
Described display device is a LED stepping display.
Described offset current adjuster is toggle switch (7).
Described residual current protecting circuit breaker is single-phase one pole, single-phase bipolar, three-phase three utmost points or three-phase and quadrupole residual current protecting circuit breaker.
The present invention can use with the circuit breaker interlock of equipment, and for the inner normal AC and DC leakage current of power consumption equipment that power consumption equipment produces, when the device start of electric leakage was arranged, device of the present invention also started simultaneously.
During for motor start-up; Can produce the bigger asymmetric leakage current of three-phase; And the less situation of the asymmetric leakage current of three-phase when normally moving; Overcompensation in the time of can adopting motor start-up; When being motor start-up, the residue alternating current that the AC compensation electric current makes the residual current protecting circuit breaker near or reach non-operating current
, the antijamming capability of residual current protecting circuit breaker is brought up to more than 2 times.In case completion motor start-up, entering reduce offset current after moving reposefully, the residual current that makes the residual current protecting circuit breaker is zero.
Operation principle of the present invention:
Like the electric current in the phase line among Fig. 1
is normal load current
and normal leakage current
sum, that is:
.Cause among
just of residual current protecting circuit breaker misoperation normal leakage current
near residual current acting value
; In case interference is arranged, the residual current protecting circuit breaker will move.Electric current
in the zero line that passes current transformer core among Fig. 1 (winding) is a normal load current
; Offset current
sum that normal leakage current
and this method provide is (in the earth neutral system; Leakage current in the zero line can be ignored), that is:
.During normal power supply, the total residual current that passes the magnetic core of current transformer is that their difference is:
.When uncompensated electric current
;
if greater than operating current
, the actuator of residual current protecting circuit breaker makes its tripping operation.But
is the leakage current that can keep normal power supply; Circuit breaker trip; Be exactly misoperation, should avoid.Introduce offset current
; Make residual current very little; I.e.
; When normal power supply; Make residual current away from operating current value and non-operating current value; Guarantee normal power supply, both guaranteed the sensitivity of its protection, improve anti-jamming capacity again to greatest extent.As shown in Figure 2, among Fig. 2, the residual current of residual current protecting circuit breaker is zero, and the voltage signal amplitude of Current Transformer Secondary side is zero.Have only that to have produced new leakage current in the supply line (possibly be the equipment fault electric leakage; Possibly be that the variation of ambient temperature and humidity changes normal leakage current; Or the person gets an electric shock); Make and increased a fault leakage current component in
; Break original equilibrium relation, just make the action of residual current protecting circuit breaker, this is that normal action is not misoperation.The present invention that Here it is can distinguish the principle of normal electric leakage and fault electric leakage.Can confirm the size of normal leakage current through following a kind of method: guarantee unmanned the electric shock before the combined floodgate, close a floodgate for the first time,, explain that leakage current on the phase line is less than operating current if can close lock; Close and observe the residual current show state behind the lock, the adjustment offset current shows up to residual current and approaches till zero.If do not close; Explain that leakage current on the phase line is greater than operating current; When closing a floodgate again, offset current increases to non-operating current
; If can close; Normal leakage current greater than operating current
is arranged on the phase line that explanation can be confirmed to supply power; If close not brake application for the second time; When closing a floodgate for the third time; Offset current is increased to
; If the lock that can close, explain have on the phase line of supplying power greater than normal leakage current, and the like till the lock that closes.Close behind the lock, the value that shows as if the residual current stepping is very little, then shut-down operation.If it is the value that the residual current stepping shows greater than non-operating current, then continues to increase offset current, very little or approach zero, then shut-down operation until the residual current that shows.The purpose of doing like this is to increase the antijamming capability of residual current protecting circuit breaker.In the absence of fault electric leakage, regardless of different kinds of the load between phase line and the zero line, always keep balance, have only the electric current that does not pass through zero line, just be considered to leak electricity.At the beginning of the combined floodgate; Confirmed the size of normal leakage current through offset current, and made in the residual current protecting circuit breaker residual current in the current transformer approach zero, in the later normal power supply process; The situation that tripping operation is arranged again; Be that the someone gets an electric shock, or be the insulation damages of certain power consumption equipment, thereby solve the contradiction between reliable power supply and the safety utilization of electric power.
In the power equipment; A lot of rectification frequency conversion equipments is arranged; This equipment can make and produce DC component in the residual current transformer; The maximum harm of this component is after causing in the magnetic core of residual current transformer the direct current flux component being arranged; The residual current signal amplitude of secondary side induction significantly reduces; Sensitivity descends, and makes non-operating current surpass
, the operating current of perhaps demarcating considerably beyond product
; Cause tripping to be done, as shown in Figure 4.Among Fig. 4, because the existence of residue direct current, the working point that makes magnetic circuit is by the A point that moves to Fig. 4 zero point (Fig. 2, shown in 3), and at this moment, residual current significantly reduces at the voltage signal that secondary side produces.Detect the residue DC component in the residual current transformer owing to have no idea to detect at present perhaps with the very high way of cost, in case tripping just thinks that device damages.The present invention is through adding the DC compensation electric current, and the situation of change of watching residual current stepping show value is just known to have or not direct current residue residual current in the phase line.If have then and compensate, make the direct current flux in the magnetic core of current transformer approach zero, guarantee that its operating current is consistent with the calibration value of product.Because the operation principle of residual current transformer has determined it can not detect the residue direct current in the winding one time, in the present invention, the method for employing is; The DC compensation electric current is provided, and the value that residual current shows increases, and explaining in the winding of residual current transformer has DC component; Need compensation; After if the DC compensation electric current is provided, the value that residual current shows diminishes, and then explaining in winding of residual current transformer does not have DC component.If there is DC component, will cause the sensitivity of protector significantly to reduce, can produce tripping and make problem.
The course of work of the present invention:
When the power consumption equipment operate as normal, the residual current in the residual current transformer is zero.The present invention confirms the size of compensation current through the switch examination combined floodgate number of times of residual current protecting circuit breaker.Because of the intrinsic leakage current in the circuit, the perhaps intrinsic leakage current of equipment when causing the residual current protecting circuit breaker to close not brake application, through increasing offset current in advance, guarantees normally to close a floodgate.Behind the combined floodgate, through the residual current size that stepping shows, further confirming increases or reduces offset current, makes residual current approach zero as much as possible.The described offset current conditioning signal that presets can be confirmed by the combined floodgate number of times of residual current protecting circuit breaker, also can be to confirm before combined floodgate through the instrument that can detect normal leakage current.
Test case of the present invention-floor heating product earth leakage protective effect test:
Because the floor heating product circuit is pasted floor pavement; And circuit is flat, and more greatly 15 ~ 110 milliamperes of capacitive character leakage currents (size of current is relevant with floor heating area size) are because the bricklayer causes the heating plate insulation local impaired when the flooring brick is constructed unavoidably; Causing the resistive leakage current is 10 ~ 100 milliamperes; Even bigger, make the owner air switch otherwise do not close or frequent movement.With device of the present invention make profile, size is identical with bipolar residual current protecting circuit breaker, and bayonet socket is arranged, and installs in the former distribution box with existing air switch, and makes the thermostat interlock of electrothemic floor, trip phenomenon is promptly eliminated.
Claims (9)
1. one kind zero residual current protection circuit method and residual current protecting circuit breaker thereof; Making the residual current of residual current protecting circuit breaker when operate as normal is zero circuit methods; In this circuit breaker residual current transformer is set; Residual current transformer secondary winding signal processor, and through the tripping mechanism linked circuit breaker, it is characterized in that: comprise following measures:
A, a winding that passes the current transformer of residual current protecting circuit breaker are provided with resistive AC compensation branch road and capacitive character AC compensation branch road respectively, make winding of current transformer not only flow through load current but also flow through the AC compensation electric current;
B, pass the residual current protecting circuit breaker another winding of current transformer through DC offset circuit is set, make a winding not only flow through load current but also flow through the DC compensation electric current;
A winding that flows through offset current of C, described current transformer can any phase line and/or the zero line that penetrates current transformer core of dual-purpose; Or a section lead that penetrates in addition formation current transformer; Except that zero line and all phase lines, has another winding that flows through offset current of electrical isolation effect;
The residual current of D, residual current transformer shows through the display device stepping, regulates offset current through adjuster according to demonstration residual current size, residual current is adjusted to approached zero;
E, described offset current are regulated through resistive AC compensation branch road and capacitive character AC compensation branch road and are regulated realization, perhaps realize through the offset supply voltage-regulation.
2. zero residual current protection circuit method as claimed in claim 1; It is characterized in that: described adjusting is through the adjustment offset current, makes remaining ac and dc current in the residual current protecting circuit breaker Current Transformer when operate as normal, always remain zero or approach zero.
3. zero residual current protection circuit method as claimed in claim 1; It is characterized in that: described adjusting is control capacittance property compensation branch road, resistive compensation branch road or DC compensation loop; To keep the size of normal leakage current under the reliable condition of power supply; Preset offset current through toggle switch, lock is advisable closing; Close behind the lock, according to showing leakage current on the display device, further regulate offset current through toggle switch, the residue ac and dc current when making its operate as normal is zero.
4. zero residual current protection circuit method as claimed in claim 1 is characterized in that: compensating direct current electric current in winding of current transformer, and make the residue direct current near zero, keep the sensitivity of its protection, reduce tripping to greatest extent and do.
5. residual current protecting circuit breaker based on the said method of claim 1; Comprise residual current transformer (8), AC compensating network, DC offset circuit, residual current signal processor (9), tripping mechanism (10); Circuit breaker (11); Residual current transformer (8) is gone up the residual current induction coil and is electrically connected residual current signal processor (9); Residual current signal processor (9) output and tripping mechanism (10) connect; Tripping mechanism (10) is linked with circuit breaker (11), it is characterized in that: described AC compensating network comprises resistive compensation branch road (1) and capacitive compensation branch road (2), and both parallel connection backs are passed residual current transformer (8) through a winding of interchange (5) and are connected with AC compensation power supply (3); Described DC offset circuit comprises DC compensation power supply (4) and compensating resistance, and both connect after passing residual current transformer (8) through a winding of direct current (6) each other.
6. residual current protecting circuit breaker as claimed in claim 6 is characterized in that: on the described residual current circuit display device is set.
7. like claim 6 or 7 described residual current protecting circuit breakers, it is characterized in that: described display device is the LED stepping display of residual current.
8. residual current protecting circuit breaker as claimed in claim 6 is characterized in that: described offset current adjuster is toggle switch (7).
9. described residual current protecting circuit breaker is single-phase one pole, single-phase bipolar, three-phase three utmost points or three-phase and quadrupole residual current protecting circuit breaker.
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|---|---|---|---|
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|---|---|---|---|
| CN201110452501XA CN102437548A (en) | 2011-12-30 | 2011-12-30 | Zero-residual-current circuit protection method and residual-current protection circuit breaker using same |
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Cited By (8)
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|---|---|---|---|---|
| CN105790213A (en) * | 2016-04-14 | 2016-07-20 | 袁月春 | Residual-current cancellation method and electric leakage protection device thereof |
| CN107110905A (en) * | 2015-01-08 | 2017-08-29 | 桑德克斯有线有限公司 | The uneven detector of sensitive DC electric current and calibration method |
| CN110703172A (en) * | 2019-08-27 | 2020-01-17 | 杭州世创电子技术股份有限公司 | A current nonlinear compensation method for residual current protection circuit breaker |
| CN111585244A (en) * | 2020-05-26 | 2020-08-25 | 芯海科技（深圳）股份有限公司 | Leakage protection circuit, integrated circuit, electronic device, and method |
| CN111817258A (en) * | 2020-06-29 | 2020-10-23 | 天津相和电气科技有限公司 | Magnetic modulation type direct current leakage protection device based on improved direct current component method |
| CN113466526A (en) * | 2021-07-27 | 2021-10-01 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
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| CN107110905A (en) * | 2015-01-08 | 2017-08-29 | 桑德克斯有线有限公司 | The uneven detector of sensitive DC electric current and calibration method |
| CN105790213A (en) * | 2016-04-14 | 2016-07-20 | 袁月春 | Residual-current cancellation method and electric leakage protection device thereof |
| CN105790213B (en) * | 2016-04-14 | 2019-01-22 | 袁月春 | A kind of residual current counteracting method and its earth leakage protective device |
| CN110703172A (en) * | 2019-08-27 | 2020-01-17 | 杭州世创电子技术股份有限公司 | A current nonlinear compensation method for residual current protection circuit breaker |
| CN111585244A (en) * | 2020-05-26 | 2020-08-25 | 芯海科技（深圳）股份有限公司 | Leakage protection circuit, integrated circuit, electronic device, and method |
| CN111817258A (en) * | 2020-06-29 | 2020-10-23 | 天津相和电气科技有限公司 | Magnetic modulation type direct current leakage protection device based on improved direct current component method |
| CN113363951B (en) * | 2021-05-21 | 2023-10-31 | 珠海格力电器股份有限公司 | Direct current residual current protector, protection method and direct current power supply system |
| CN113466526A (en) * | 2021-07-27 | 2021-10-01 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
| CN113466526B (en) * | 2021-07-27 | 2022-07-26 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
| WO2024017499A1 (en) * | 2022-07-20 | 2024-01-25 | Eaton Intelligent Power Limited | Residual current breaker with improved resistance against dc saturation |
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