CN103683182B - Circuit device for electrical protective device - Google Patents
Circuit device for electrical protective device Download PDFInfo
- Publication number
- CN103683182B CN103683182B CN201310384177.1A CN201310384177A CN103683182B CN 103683182 B CN103683182 B CN 103683182B CN 201310384177 A CN201310384177 A CN 201310384177A CN 103683182 B CN103683182 B CN 103683182B
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- China
- Prior art keywords
- control device
- electromagnetic separation
- voltage
- trigger signal
- trig
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
Landscapes
- Relay Circuits (AREA)
- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Abstract
Circuit device for electrical protective device.The present invention relates to the circuit devices (10) for electrical protective device, include electric line (12), electromagnetic separation (16), switching device (T1), control device (18), the electromagnetic separation is configured to keep electric line (12) electrically separated when applying voltage (U), the switching device is configured to, voltage (U) is applied on the electromagnetic separation (16) according to trigger signal (trig), the control device be used for detect in the electric line (12)/on fault current and/or electric arc presence and in the presence of fault current and/or electric arc generate be used for the switching device (T1) trigger signal (trig), wherein the control device (18) is configured to, detect the zero crossing of the voltage (U) simultaneously And the trigger signal (trig) for being used for the switching device (T1) is generated according to detected zero crossing.
Description
Technical field
The present invention relates to a kind of circuit devices for electrical protective device.In addition, the present invention relates to one kind for running electricity
The method of protective device.
Background technique
Usually using electrical protective device in electrical installation system.The example of electrical protective device is failture current protection device
It, can by the failture current protection device with the fault arc protection device for protecting electric facility against damages by fault electric arc
To prevent fault current to be grounded.Protective device usually requires the circuit device with analog and/or digital component, by the electricity
Road device can detecte fault current or electric arc.In addition, can export by this circuit device for manipulating separator
Trigger signal, the trigger signal cause, and fill in the circuit or electric line and electricity supply for wherein identifying out of order installation system
It sets electrically separated.
If there is fault current or electric arc, then mechanical-electric coupling is needed, by the mechanical-electric coupling, circuit or route can be with
It is separated with feedway.Very the solution of cost advantages can be separated according to moving-coil (Tauchspule) principle by electromagnetism
Device is realized.This electromagnetic separation has coil, can make pushrod movement by the coil.Pass through the fortune of push rod
It is dynamic, electrical contacts can be made to open.Here, sufficiently high electromagnetic force must be provided by coil, so that electrical contacts can be with
Push rod separation.Coil is usually connect with voltage.Because providing and being supplied voltage within the scope of 50V to 400V in electric system
Run all parts, so on the one hand must assure that, electromagnetic separation also provided in the case where low-voltage enough power with
It is used to open contact portion.On the other hand, electromagnetic separation does not also allow to be damaged in the case where high voltage.
In order to meet these two requirements, three kinds of different solutions are followed so far.On the one hand, can provide can also
With the coil for high voltage.In order to keep coil also not damaged in the case where the high-energy or power occurred herein, need
A large amount of winding and corresponding wire cross section.Another possibility is, using the coil for being designed to lower voltage,
And by the electrical power in voltage regulator limitation coil.Finally, electromagnetic separation can be used, the electromagnetism separation dress
It sets and is triggered in very low electrical power.For this purpose, magnetic switch can be used for example.The embodiment being described needs electricity to protect
Additional structure space and additional expense is caused in protection unit.
Summary of the invention
Therefore, the task of the present invention is, the circuit device of the type at the beginning is provided, can more simply and more by it
Cost-effectively running protection device.
The task has right by a kind of circuit device with feature described in claim 1 and by a kind of
It is required that the method for feature described in 8 solves.Favourable improvement scheme of the invention illustrates in the dependent claims.
It is according to the present invention, for electrical protective device circuit device include electric line, electromagnetic separation, switch dress
It sets, control device, the electromagnetic separation is configured to keep electric line electrically separated when applying voltage, the switching device
It is configured to be applied a voltage on electromagnetic separation according to trigger signal, the control device is for detecting electric line
In/on fault current and/or electric arc presence and be used for for being generated in the presence of fault current and/or electric arc
The trigger signal of switching device, wherein control device is configured to, and detects the zero crossing of voltage and according to mistake detected
Zero point generates the trigger signal for being used for switching device.
Circuit device can be used for failture current protection device and/or fault arc protection device.Circuit device can be with
It is arranged in the shell of electrical protective device.Circuit device includes at least one electric line, can apply electricity in the electric line
Pressure, especially alternating voltage.Circuit device may be also used in multiphase system.In addition, circuit device includes the electricity of protective device
Magnetic separating device, the electromagnetic separation can be constructed according to moving-coil principle.The connecting terminal of electromagnetic separation can be with
It is connect with electric line.In order to run electromagnetic separation, the electromagnetic separation service voltage can be given.To this end it is possible to use,
Such as it is configured to the switching device of thyristor, it can be with electric line and additional by the switching device electromagnetic separation
Line connection.After electromagnetic separation is connect with route and ground wire, apply voltage on their binding post.This causes electric current
Flow through the coil of electromagnetic separation.Due to the electromagnetic force of coil, make the movable pushrod movement of electromagnetic separation.Pass through
The movement of push rod can separate the contact portion of electric line.
In addition, the circuit device includes control device, the control device is configured to, detect in electric line/on
Or fault current and/or electric arc in the route that is connect with electric line.Instead of this place, control device can receive outside
Detection device signal, detect fault current and/or electric arc by the detection device of the outside.If detecting failure electricity
Stream and/or electric arc, then control device can export trigger signal to switching device, and due to the trigger signal, switching device will
Voltage is applied on electromagnetic separation.By applying a voltage on electromagnetic separation, electromagnetic separation is activated simultaneously
And electric line is separated.
If electromagnetic separation or its coil are connect with voltage at any time, electric current flows through always coil, until
Until voltage reaches next zero crossing.It means that electric current maximum flows through coil on the duration of half-wave.Control device is attached
It is configured to adding, detects the zero crossing of voltage and according to the zero crossing detected come manipulation of switches device.It is possible thereby to
Adjust and reduce the energy absorption of coil.This makes it possible for the electromagnetic separation with coil, and the coil has more
The winding of small number and/or smaller wire cross section.Therefore cost and structure space can be saved.
Control device is preferably configured to, on the time after zero crossing detected it is predetermined continue when
Between after generate be used for switching device trigger signal.Thus the duration of electric current flowing can pass through electromagnetic separation
Coil is by accurate match.
In another expansion scheme, control device is configured to, on the time after prespecified lower threshold
And the trigger signal that generation is used for switching device before prespecified upper limit threshold continues after zero crossing detected
The duration.Therefore in other words, a prespecified time interval, the control device manipulation of switches in the time interval
Device.Threshold value can be stored in the memory of control device.Therefore, the electromagnetism of electrical protective device can particularly precisely be manipulated
Separator.
It is also advantageous that control device be configured to be determined according to the current running temperature of electromagnetic separation it is pre-
Lower threshold as defined in elder generation.Control device can be connect with temperature sensor, the temperature sensor and electromagnetic separation coupling
It closes.It is possible thereby to particularly securely manipulate electromagnetic separation.
In one embodiment, control device is configured to, and generates use according to the triggered time of electromagnetic separation
In the trigger signal of switching device.Triggered time corresponds at the time of electromagnetic separation is connect with voltage and until electric line
Duration between at the time of being electrically isolated by electromagnetic separation.It, can be with by considering the triggered time of separator
Guarantee the reliability service of electrical protective device.
In a kind of expansion scheme, control device is configured to, and is sought according to the average value of voltage and/or virtual value
Zero point.It additionally, can be before being detected by control device to voltage commutation.Control device can have analog to digital and turn
Parallel operation, the analogue-to-digital converters are connect with computing device.Therefore the zero passage of voltage can be determined by simple mode
Point.
In another embodiment, divider is connected between control device and electric line.Therefore it may be implemented, voltage
Only one partial pressure fall on control device.This partial pressure that its amplitude can be only a few percent of voltage amplitude can be with
Simply by control device computing device or common electronic component be detected.
Method according to the present invention for running electrical protective device is configured to applying including providing electric line, providing
The electromagnetic separation of electrically separated electric line, offer are configured to apply a voltage to electromagnetism according to trigger signal when making alive
Switching device on separator, by control device detection electric line/on fault current and/or electric arc presence,
The trigger signal for switching device is generated, by control by control device in the presence of fault current and/or electric arc
Device detects the zero crossing of voltage and generates the triggering for being used for switching device according to zero crossing detected by control device
Signal.
The advantages of previously associatedly describing with circuit device according to the present invention and improvement project can be in an identical manner
It is transferred on according to the method for the present invention.
Preferably, on the time after prespecified lower threshold and before prespecified upper limit threshold by
Control device, which is generated, continues the duration after zero crossing detected for the trigger signal of switching device.
In one embodiment, prespecified upper limit threshold passes through the static and dynamic power on electromagnetic separation
Measurement generates the trigger signal for being used for switching device to seek before the prespecified upper limit threshold.In design circuit
The corresponding measurement on electromagnetic separation can be executed when device.It is possible thereby to when reliably determining the triggering of electromagnetic separation
Between.
In another embodiment, prespecified lower threshold is according to the calculating executed on electromagnetic separation
And/or load testing is sought, and the trigger signal for being used for switching device is generated after the prespecified lower threshold.?
This, it is also contemplated that the different value or temperature of voltage amplitude influence.It is possible thereby to particularly securely be transported according to ambient environmental conditions
Row electromagnetic separation.
Detailed description of the invention
The present invention is explained in detail now according to attached drawing.Here, unique Fig. 1 shows circuit device with schematical.
The embodiment being then described in detail is the preferred embodiment of the present invention.
Specific embodiment
Attached drawing 1 shows the schematic diagram of the circuit device 10 for electrical protective device.This electrical protective device can be failure
Current protective device (Residual Current Detector: residual current detector, RCD) or fault arc protection device
(Arc Fault Detection Device: arc fault detection device, AFDD).Circuit device 10 has the first electric line 12
With the second electric line 14.Electric line 12,14 and electric feedway not shown here --- such as with energy supply network ---
Connection.Apply voltage U, especially alternating voltage between two electric lines 12,14.Here, the second electric line and ground terminals
Son 20 connects.
In addition, circuit device 10 has an electromagnetic separation 16, the electromagnetic separation has coil L1 and herein not
The push rod shown.Electromagnetic separation 16 is established according to moving-coil principle.If transporting push rod with electric current flowing through coil L1
Corresponding contact portion in dynamic and electric line 12 is opened.Therefore, electric line 12 and feedway or voltage U are electrically separated.
In addition, circuit device 10 has switching device T1.Switching device T1 for example may be constructed such that thyristor.Two electricity
Route 12 and 14 can be connected by switching device T1.This causes, and electric current flows through coil L1 and electric line 12 is separated.This
Outside, first diode D1 is set, and the first diode and coil L1 are connected in series.It can be to flowing through coil L1 by diode D1
Current rectification.Prevent with the second coil L1 parallel diode D2 on cut-off direction since electric current is flowed into coil L1 and
Form overvoltage.
In addition, circuit device 10 has control device 18.By control device 18, electric wire can be detected according to application scenarios
Fault current or electric arc in road 12,14.In order to detect fault current or in order to identify electric arc, external inspection can also be set
Device is surveyed, the detection device of the outside transmits corresponding letter to control device 18 in the presence of fault current or electric arc
Number.If it is confirmed that fault current and/or electric arc, then export trigger signal trig by control device 18.Trigger signal trig
It is transferred to switching device T1.After receiving trigger signal trig, device 18 is turned off the switch, thus applies electricity at coil L1
It presses U and coil L1 is flowed through by electric current.This causes, pushrod movement and electric line 12 is spaced.If switching device T1 is by structure
It makes as thyristor, then controls the gate terminal that signal trig can be used as electric current or current impulse is transferred to thyristor, by
This thyristor is ignited and is switched on conducting direction.
Control device 18 is connect with electric line 12 in the present embodiment.This makes it possible to monitor voltage by control device 18
U.For this purpose, connecting control device 18 via divider 22.Divider 22 includes the resistance R1 and R2 of two series connections.It is logical
The series circuit of two resistance R1 and R2 are crossed, electrical power can be correspondingly assigned on the two resistance R1 and R2.Substitutional resistance
R1 and R2 can also use only one resistance.In addition, divider 22 includes and the concatenated resistance R3 of resistance R1 and R2.Pass through
Divider 22, voltage U or the only one by the diode D1 voltage rectified divide and are transferred to control device 18.Such as it can
So to select resistance, so that 0.5% partial pressure of the amplitude of voltage U is fallen on control device 18.
Control device 18 is configured to the zero crossing of detection voltage U.For this purpose, control device 18 has Analog-digital Converter
Device can digitize the partial pressure of voltage U by the analog-digital converter.In addition, control device 18 can have micro-control
The computing device of device processed, ASIC or comparator form, by the computing device, according to the partial pressure fallen on control device 18
Average value or virtual value determine the zero crossing of voltage U.
If electromagnetic separation 16 or coil L1 are connect with voltage U at any time, electric current flows through always coil L1,
Until voltage U reaches next zero crossing.It means that electric current maximum flows through coil L1 on the duration of half-wave.
The duration of half-wave is 10ms in the case where the voltage U with 50Hz frequency.According to cycle duration T, voltage U, angle
The resistance R of frequencies omega, time t and coil L1L, the ceiling capacity formed herein can be calculated and absorb Emax:
。
By control device 18, it now is possible to according to the zero crossing manipulation of switches device T1 of voltage U.Especially by control
Device 18 can also the trigger switch device T1 after the prespecified duration in time.Substitute the duration also
Phase angle [alpha] can be distributed.Calculating and phase angle according to the following formulaRelated energy absorption:
。
If control device 18 is at 90 ° of phase angle, i.e. after the zero crossing of voltage U the duration of 5ms feelings
Trigger switch device T1 under condition, then energy absorption can reduce half.If at 115 ° of phase angleOr in zero crossing
The triggering of switching device T1 is realized in the case where the duration of about 6.3ms later by control device 18, then energy absorption can
To reduce 3/4ths.
Further, it is also possible to the prespecified time interval after the zero crossing for reaching voltage U, in the time interval
In, 18 trigger switch device T1 of control device.It replacement time interval can be with prespecified angular spacing.It is namely prespecified to hold
The lower threshold and upper limit threshold of continuous time, wherein in time interval of the control device 18 between lower threshold and upper limit threshold
Trigger switch device T1.Herein, it is also contemplated that the triggering duration of electromagnetic separation 16.Threshold value can be for example with mathematics
The form of function or table is stored in the memory dedicated for the control device 18 of electromagnetic separation 16.The threshold value can
To be to have been sought by measuring and calculating of previously having been executed on electromagnetic separation 16.
The upper limit threshold of duration can be in advance according to the power measurement either statically or dynamically on electromagnetic separation 16
It seeks.The upper limit threshold of duration can be sought by theoretical calculation or load testing.In addition, control device 18 can be by
Be configured to, current detection electromagnetic separation 16 temperature and according to the Temperature Matching lower limit time threshold.
By the triggering of control switch device T1, it can reduce the duration for flowing through the electric current of coil L1 and therefore subtract
The energy absorption of small coil L1.This makes it possible for the electromagnetic separation 16 with coil L1, and the coil has smaller
The winding of quantity and/or lesser wire cross section.Therefore cost and structure space can be saved.
Reference signs list
10 circuit devices
12 routes
14 routes
16 separators
18 control devices
20 ground connecting terminals
22 divider
Dl diode
D2 diode
L1 coil
R1 resistance
R2 resistance
R3 resistance
Trig trigger signal
T1 switching device
U voltage.
Claims (8)
1. being used for the circuit device (10) of electrical protective device, comprising:
Electric line (12),
Electromagnetic separation (16), the electromagnetic separation are configured to, and make electric line (12) when applying voltage (U)
It is electrically separated,
Switching device (T1), the switching device are configured to, and are applied the voltage (U) according to trigger signal (trig)
To on the electromagnetic separation (16),
Control device (18), the control device be used for detect in the electric line (12)/on fault current and/or electric arc
Presence and in the presence of fault current and/or electric arc generate for the switching device (T1) triggering believe
Number (trig),
It is characterized in that,
The control device (18) is configured to, and detects the zero crossing of the voltage (U) and according to zero passage detected
Point generates the trigger signal (trig) for being used for the switching device (T1),
Wherein the control device (18) is configured to, in prespecified lower threshold on the time after detecting zero crossing
It generates and continues for the trigger signal (trig) of the switching device (T1) later and before prespecified upper limit threshold
The predetermined duration, accurately to manipulate the electromagnetic separation (16) of electrical protective device.
2. circuit device (10) according to claim 1, which is characterized in that the control device (18) is configured to,
The prespecified lower threshold is determined according to the current running temperature of the electromagnetic separation (16).
3. circuit device (10) according to claim 1 or 2, which is characterized in that the control device (18) is constructed use
In generating the trigger signal for the switching device (T1) according to the triggered time of the electromagnetic separation (16)
(trig).
4. circuit device (10) according to claim 1 or 2, which is characterized in that the control device (18) is constructed use
In seeking the zero crossing according to the average value of the voltage (U) and/or virtual value.
5. circuit device (10) according to claim 1 or 2, which is characterized in that divider (22) is connected to the control
Between device (18) and the electric line (12).
6. the method for running electrical protective device by following movement:
It provides electric line (12),
The electromagnetic separation (16) for being configured to the electrically separated electric line (12) when applying voltage (U) is provided,
Offer is configured to that voltage (U) is applied on the electromagnetic separation (16) according to trigger signal (trig)
Switching device (T1),
Detected in the electric line (12) by control device (18)/on fault current and/or electric arc presence, and
It is generated in the presence of fault current and/or electric arc by the control device (18) and is used for the switching device
(T1) trigger signal,
It is characterized in that,
The zero crossing of the voltage (U) is detected by the control device (18), and
It is generated by the control device (18) according to zero crossing detected and is believed for the triggering of the switching device (T1)
Number (trig),
Wherein after detecting zero crossing on the time after prespecified lower threshold and in the prespecified upper limit
It generates before threshold value by the control device (18) and continues in advance for the trigger signal (trig) of the switching device (T1)
The determining duration, accurately to manipulate the electromagnetic separation (16) of electrical protective device.
7. according to the method described in claim 6, it is characterized in that, the prespecified upper limit threshold passes through the electromagnetism point
It is sought from the static and or dynamic power measurement on device (16), use is generated before the prespecified upper limit threshold
In the trigger signal (trig) of the switching device (T1).
8. method according to claim 6 or 7, which is characterized in that the prespecified lower threshold is according to described
The calculating that executes on electromagnetic separation (16) and/or load testing are sought, after the prespecified lower threshold
Generate the trigger signal (trig) for being used for the switching device (T1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012215310.1 | 2012-08-29 | ||
| DE102012215310.1A DE102012215310B4 (en) | 2012-08-29 | 2012-08-29 | Circuit arrangement for an electrical protective device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103683182A CN103683182A (en) | 2014-03-26 |
| CN103683182B true CN103683182B (en) | 2019-04-30 |
Family
ID=49119109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310384177.1A Active CN103683182B (en) | 2012-08-29 | 2013-08-29 | Circuit device for electrical protective device |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN103683182B (en) |
| DE (1) | DE102012215310B4 (en) |
| GB (1) | GB2505561B (en) |
| IT (1) | ITMI20131400A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10509067B2 (en) * | 2017-07-06 | 2019-12-17 | Mersen Usa Newburyport-Ma, Llc | Method for AC arc fault detection using multidimensional energy points |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5715125A (en) * | 1995-05-04 | 1998-02-03 | Leviton Manufacturing Co., Inc. | Intelligent ground fault circuit interrupter |
| GB2374218A (en) * | 2001-04-06 | 2002-10-09 | John Russell Fielden | Switch & switching circuit |
| US7440245B2 (en) * | 2004-09-28 | 2008-10-21 | Eaton Corporation | Arc fault circuit interrupter and method of detecting an arc fault |
| CN201805222U (en) * | 2010-06-28 | 2011-04-20 | 沈阳工业大学 | Series fault arc detection device adopting wavelet entropy |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5963406A (en) * | 1997-12-19 | 1999-10-05 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
| US6362628B2 (en) * | 1998-12-21 | 2002-03-26 | Pass & Seymour, Inc. | Arc fault circuit detector device detecting pulse width modulation of arc noise |
| US6433977B1 (en) * | 1999-04-16 | 2002-08-13 | Pass & Seymour, Inc. | Combo AFCI/GFCI with single test button |
| US6504692B1 (en) * | 2000-04-06 | 2003-01-07 | Pass & Seymour, Inc. | AFCI device which detects upstream and downstream series and parallel ARC faults |
| US20030151478A1 (en) * | 2001-10-02 | 2003-08-14 | Dejan Radosavljevic | Protection device with lockout test |
| US7003435B2 (en) * | 2002-10-03 | 2006-02-21 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
| CN1206679C (en) * | 2002-11-26 | 2005-06-15 | 莫红文 | Under voltage/subexcitation drop-away device circuit |
| DE102011080523A1 (en) * | 2011-08-05 | 2013-02-07 | Siemens Aktiengesellschaft | Arc fault protection switch with overvoltage protection |
| CN202267171U (en) * | 2011-10-19 | 2012-06-06 | 珠海格力电器股份有限公司 | Air conditioner with auxiliary heating system |
| CN102568963B (en) * | 2012-02-16 | 2014-04-09 | 常州工学院 | Alternating current shunt tripper suitable for working with alternating current relay in series |
-
2012
- 2012-08-29 DE DE102012215310.1A patent/DE102012215310B4/en active Active
-
2013
- 2013-07-23 GB GB1313092.7A patent/GB2505561B/en active Active
- 2013-08-23 IT IT001400A patent/ITMI20131400A1/en unknown
- 2013-08-29 CN CN201310384177.1A patent/CN103683182B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5715125A (en) * | 1995-05-04 | 1998-02-03 | Leviton Manufacturing Co., Inc. | Intelligent ground fault circuit interrupter |
| GB2374218A (en) * | 2001-04-06 | 2002-10-09 | John Russell Fielden | Switch & switching circuit |
| US7440245B2 (en) * | 2004-09-28 | 2008-10-21 | Eaton Corporation | Arc fault circuit interrupter and method of detecting an arc fault |
| CN201805222U (en) * | 2010-06-28 | 2011-04-20 | 沈阳工业大学 | Series fault arc detection device adopting wavelet entropy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103683182A (en) | 2014-03-26 |
| GB2505561B (en) | 2015-05-27 |
| ITMI20131400A1 (en) | 2014-03-01 |
| DE102012215310A1 (en) | 2014-03-06 |
| GB201313092D0 (en) | 2013-09-04 |
| DE102012215310B4 (en) | 2020-09-03 |
| GB2505561A (en) | 2014-03-05 |
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