CN107332207A - A kind of sensitive failture current protection device of alternating current-direct current - Google Patents
A kind of sensitive failture current protection device of alternating current-direct current Download PDFInfo
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- CN107332207A CN107332207A CN201710764524.1A CN201710764524A CN107332207A CN 107332207 A CN107332207 A CN 107332207A CN 201710764524 A CN201710764524 A CN 201710764524A CN 107332207 A CN107332207 A CN 107332207A
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Classifications
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- 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
- H02H3/33—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 using summation current transformers
- H02H3/332—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 using summation current transformers with means responsive to dc component in the fault current
-
- 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
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of sensitive failture current protection device of alternating current-direct current; including a power circuit, one dependent on electric network source Fisrt fault current sensing means, one independently of line voltage the second fault current detection device, one be used for drive mechanism thread off drive device; the drive signal of Fisrt fault current sensing means and the second fault current detection device is connected in parallel to the control end of drive device, and has been carried out with isolation circuit mutually isolated.The failture current protection device sensitive the invention provides alternating current-direct current is related to, the device not only provides AC fault electric current, pulsating direct current fault-current protection, moreover it is possible to which offer includes smooth direct fault current, high frequency fault current protection.And AC fault current protection is still provided under loss of power.
Description
Technical field
The present invention relates to a kind of sensitive failture current protection device of alternating current-direct current.
Background technology
The prior art of fault to ground Aftercurrent protecting equipment includes being used to detect exchange, pulsating direct current fault current
A types or AC type ground-fault interrupters, but with the application of the electrical equipments such as frequency converter, inverter.For high frequency fault current
And the protection equipment of smooth fault current increasingly becomes important.
Patent CN200410043294.2 discloses a kind of sensitive failture current protection device of alternating current-direct current, and the equipment is used for
Directly with the fault-current protection occasion exchanged, it realizes that the detection mode of direct current passes through a decoupling device device and magnetic core
Secondary coil is connected.
Patent CN1387213A is disclosed will for the technology of the ring-shaped core in the failture current protection devices such as AC, DC
Ask.The patent highlights the requirement of the BH curve of magnetive cord.
Direct current detection method utilizes the discrepancy that saturation is saturated in non-magnetic in patent US4276510.Circuit design
Tertiary coil and complicated analog circuit are also needed to, the difficulty and cost of realization is also increased, accuracy of detection is influenceed.
In patent CN200810003355.0 direct current detection method need an independent sine wave generating circuit and
The sample rate current of two equal turn numbers, and follow-up detection circuit.
Patent CN200410043294.2 DC detecting stills need extra uncoupling device to realize, whole circuit compared with
For complexity.It is the detection for realizing DC current in patent CN1387213A, higher requirement is proposed to magnetic core, technique is added
Difficulty.Patent US4276510 is to allow inductance (magnetic conductivity) to change, by detect the inductance value of magnetic core under fault current it is different
Characteristic detects fault current, and whole circuit is complex.Direct current detection method is needed in patent CN200810003355.0
The sample rate current of an independent sine wave generating circuit and two equal turn numbers, and follow-up detection circuit are wanted, circuit is more
It is complicated.
More for the usual electronic module of exciting circuit of prior art, structure is numerous and diverse, considerably increases the cost of circuit
With the reduction of reliability, the size of miniature circuit breaker is limited in addition, and internal process will be brought complicated, the problem of radiating bad.
The content of the invention
The failture current protection device sensitive the invention provides alternating current-direct current is related to, the device not only provides AC fault electricity
Stream, pulsating direct current fault-current protection, moreover it is possible to which offer includes smooth direct fault current, high frequency fault current protection.And in electricity
Source still provides AC fault current protection under losing.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of sensitive failture current protection device of alternating current-direct current, including power circuit, one depend on electric network source
Fisrt fault current sensing means, one independently of line voltage the second fault current detection device, one be used for drive
Drive signal and the connection of the drive device of mechanical unlocking, Fisrt fault current sensing means and the second fault current detection device
To the control end of drive device, and carried out with isolation circuit mutually isolated.
The present invention is further arranged to, and the Fisrt fault current sensing means includes signal sample circuit, signal and carried
Sense circuit, logic processing circuit, are acquired by signal sample circuit to alternating current-direct current fault current, and the waveform after sampling is through signal
Extract circuit to be extracted, input logic process circuit, logical process electricity is differentiated according to the signal extracted, and produces drive
Dynamic signal.
The present invention is further arranged to, the signal sample circuit include magnetic core,
Around the magnetic core and be connected to resistance R4 and resistance R5 secondary coil,
The comparator A and comparator B that are powered by unipolarity power supply,
The divider resistance R1 and divider resistance R2 of offer reference voltage,
And feedback resistance R3,
The magnetic core, which is surrounded, holds current-carrying conductor setting, and comparator B output pin is connected with resistance R5, comparator B's
Positive pin is connected with resistance R3, divider resistance R1, divider resistance R2, comparator A negative pin, comparator B negative pin and resistance R3, electricity
R4, comparator A output pin connection are hindered, resistance R3 one end and resistance R4, comparator A output pin, comparator B negative pin connect
Connect, comparator A positive pin is connected with resistance R4, secondary coil, comparator A output pin is connected with resistance R4, comparator A's is negative
Pin is connected with divider resistance R1, divider resistance R2, divider resistance R1 ground connection.
The present invention is further arranged to, and the signal extracting circuit includes resistance R6 and electric capacity C1, resistance R6 one end
It is connected with signal sample circuit 8, the resistance R6 other end is connected with electric capacity C1, logic processing circuit, electric capacity C1 one end ground connection, electricity
The other end for holding C1 is connected with resistance R6, logic processing circuit.
The present invention is further arranged to, and the logic processing circuit includes power supply circuit, comparison circuit, delays time to control electricity
Road, when comparison circuit detects signal and reaches given threshold, judges signal magnitude again after being handled through delay control circuit, if still surpassing
When crossing given threshold, output drive signal, if signal is less than setting value, driving circuit does not work；Power supply circuit is at logic
Manage circuit and reliable reference power supply is provided.
The present invention is further arranged to, and the second fault current detection device includes magnetic core, surround the magnetic core simultaneously
The secondary coil of detection means is connected to, detection means is connected with isolation circuit.
The present invention is further arranged to, and the isolation circuit is made up of electric capacity and diode.
The present invention is further arranged to, and the comparator A and comparator B can be put with operational amplifier and/or triode
Big circuit is substituted.
The present invention is further arranged to, and the power supply provides necessary power supply for Fisrt fault current sensing means.
Beneficial effects of the present invention：
(1) the sensitive Aftercurrent protecting equipment electronic structure of alternating current-direct current provided by the present invention is simple and reliable, and protection
It is full-featured；
(2) realized using a small number of inexpensive elements and hand over constant current detection circuit；
(3) misoperation brought in power-on and power-off moment by voltage instability is eliminated；
(4) circuit is simple, realizes that two-way drives purpose without complicated isolation circuit.
Brief description of the drawings
Fig. 1 is circuit theory schematic diagram of the invention.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Below with reference to Fig. 1, the present invention will be described.
A kind of sensitive failture current protection device of alternating current-direct current, including power circuit, one depend on electric network source
Fisrt fault current sensing means 6, one independently of line voltage the second fault current detection device 1, one be used to drive
The drive device 5 of dynamic mechanical unlocking, the drive signal of the fault current detection device 1 of Fisrt fault current sensing means 6 and second
The control end of drive device is connected in parallel to, and has been carried out with isolation circuit 4 mutually isolated.
Wherein Fisrt fault current sensing means 6 includes signal sample circuit 8, signal extracting circuit 9, logic processing circuit
10, alternating current-direct current fault current is acquired by signal sample circuit 8, the waveform after sampling is carried through signal extracting circuit 9
Take, input logic process circuit 10, logic processing circuit 10 is differentiated according to the signal extracted, and produces drive signal.
Wherein signal sample circuit 8 includes magnetic core 7, surround the magnetic core 7 and is connected to resistance R4 and resistance R5 secondary
Coil 15, the comparator A and comparator B that are powered by unipolarity power supply, the divider resistance R1 and divider resistance that reference voltage is provided
R2 and feedback resistance R3, the encirclement of magnetic core 7 is held current-carrying conductor 14 and set, and comparator B output pin and resistance R5 connect
Connect, comparator B positive pin is connected with feedback resistance R3, divider resistance R1, divider resistance R2, comparator A negative pin, comparator B
Negative pin be connected with feedback resistance R3, resistance R4, comparator A output pin, feedback resistance R3 one end and resistance R4, comparator
The negative pin connection of A output pin, comparator B, comparator A positive pin is connected with resistance R4, secondary coil 15, and comparator A's is defeated
Go out pin to be connected with resistance R4, comparator A negative pin is connected with divider resistance R1, divider resistance R2, divider resistance R2 ground connection.
Wherein signal extracting circuit 9 includes resistance R6 and electric capacity C1, and resistance R6 one end is connected with signal sample circuit 8,
The resistance R6 other end is connected with electric capacity C1, logic processing circuit 10, electric capacity C1 one end ground connection, electric capacity the C1 other end and resistance
R6, logic processing circuit 10 are connected.
Wherein logic processing circuit 10 includes power supply circuit 11, comparison circuit 12, delay control circuit 13, comparison circuit 12
When detecting signal and reaching given threshold, signal magnitude is judged again after being handled through delay control circuit 13, if still above setting threshold
During value, output drive signal, if signal is less than setting value, driving circuit does not work；Power supply circuit 11 is logic processing circuit
10 provide reliable reference power supply.
Wherein the second fault current detection device 1 includes magnetic core 2, surround the magnetic core 2 and is connected to time of detection means 3
Level coil 16, detection means 3 is connected with isolation circuit 4.
Fig. 1 shows the embodiment of the sensitive two-way Aftercurrent protecting equipment of alternating current-direct current.It is remaining that it designates alternating current-direct current
The physical circuit framework of current protective device, be carried on residual current detection magnetic core 7 around major loop wire (conductor 14) with
Sample circuit 8 in Fisrt fault current detection circuit 6 constitutes the multi-resonant oscillating circuit of sensing fault current, and by sample circuit
8 are converted into sampled output signal.The then rear end of sample circuit 8 connection logic processing circuit 10, logic processing circuit 10 is by powering
Circuit 11, comparison circuit 12 and the circuit of delay control circuit 13 are constituted, and front-end sampling output signal and given threshold are compared
After relatively, after the lasting delay relatively through a period of time, fault-signal is exported.Logic processing circuit 10 is directly connected to isolation circuit 4.
Second fault current detection circuit 1 use electromagnetic type fault current detection, directly by residual current detection magnetic core 2 provide energy and
Signal, can detect fault to ground electric current, and unrelated with line voltage, its fault output signal is connected to isolation circuit 4.Isolation electricity
Road 4 is made up of electric capacity and diode, mainly prevents mutual between two-way protection circuit the first and second fault current detections circuit
Interference, the rear end of isolation circuit 4 is directly connected to drive device 5, is acted by the output signal trigger mechanism of isolation circuit 4.
Also include power circuit 17, the one end of power circuit 17 is connected with Fisrt fault current sensing means 6, and the other end is with leading
Body 14 is connected, and power circuit 17 is mainly that line voltage is converted to the dc source needed for Fisrt fault current detection circuit 6.
Residual current detection magnetic core 7 in Fisrt fault current detection circuit 6, its first winding is that main power network current-carrying is led
Body, secondary windings is connected to sample circuit 8 and constitutes multivibrator circuit, and multivibrator circuit produces self-oscillation, so that
Make to be passed through carrier current signal in sample circuit, when main grid collapses, fault current is by carrier signal modulation.
Multivibrator circuit is connected with signal extracting circuit 9 in sample circuit 8, the fault-current signal and carrier wave of modulation
Signal is demodulated in signal extracting circuit 9, and then sampled signal is connected to logic processing circuit 10.
Current signal after demodulation process is passed through comparison circuit 11, when fault-current signal amplitude is defeated more than comparison circuit 11
When entering the threshold voltage at end and continuing the certain time-delay time, comparison circuit output forward voltage signal is transmitted to isolation circuit 4, from
And driver 5, disconnect power network switch.
Power supply circuit 11 is that logic processing circuit 10 provides reliable reference power supply.
Comparator A and comparator B can be substituted with operational amplifier and/or transistor amplifier.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and modification can also be made, above-mentioned hypothesis these
Improvement and modification also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of sensitive failture current protection device of alternating current-direct current, it is characterised in that：Including a power circuit (17), one according to
The Fisrt fault current sensing means (6) in electric network source, second fault current detection independently of line voltage is relied to fill
Put (1), a drive device (5) for drive mechanism dropout, Fisrt fault current sensing means (6) and the second fault current
The drive signal of detection means (1) is connected in parallel to the control end of drive device, and has been carried out with isolation circuit (4) mutually isolated.
2. a kind of sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：Described first
Fault current detection device (6) includes signal sample circuit (8), signal extracting circuit (9), logic processing circuit (10), by believing
Number sample circuit (8) is acquired to alternating current-direct current fault current, and the waveform after sampling is extracted through signal extracting circuit (9),
Input logic process circuit (10), logic processing circuit (10) is differentiated according to the signal extracted, and produces drive signal.
3. a kind of sensitive failture current protection device of alternating current-direct current according to claim 2, it is characterised in that：The signal
Sample circuit (8) include magnetic core (7),
Around the magnetic core (7) and be connected to resistance R4 and resistance R5 secondary coil (15),
The comparator A and comparator B that are powered by unipolarity power supply,
The divider resistance R1 and divider resistance R2 of offer reference voltage,
And feedback resistance R3,
The magnetic core (7), which is surrounded, holds current-carrying conductor (14) setting, and comparator B output pin is connected with resistance R5, comparator B
Positive pin be connected with resistance R3, divider resistance R1, divider resistance R2, comparator A negative pin, comparator B negative pin and resistance R3,
Resistance R4, comparator A output pin connection, resistance R3 one end and resistance R4, comparator A output pin, comparator B negative pin
Connection, comparator A positive pin is connected with resistance R4, secondary coil (15), and comparator A output pin is connected with resistance R4, is compared
Device A negative pin is connected with divider resistance R1, divider resistance R2, divider resistance R1 ground connection.
4. a kind of sensitive failture current protection device of alternating current-direct current according to claim 2, it is characterised in that：The signal
Extracting circuit includes resistance R6 and electric capacity C1, and resistance R6 one end is connected with signal sample circuit (8), the resistance R6 other end and
Electric capacity C1, logic processing circuit connection, electric capacity C1 one end ground connection, electric capacity the C1 other end and resistance R6, logic processing circuit connect
Connect.
5. a kind of sensitive failture current protection device of alternating current-direct current according to claim 2, it is characterised in that：The logic
Process circuit (10) includes power supply circuit (11), comparison circuit (12), delay control circuit (13), and comparison circuit (12) is detected
When signal reaches given threshold, signal magnitude is judged again after being handled through delay control circuit (13), if during still above given threshold,
Output drive signal, if signal is less than setting value, driving circuit does not work；Power supply circuit (11) is logic processing circuit (10)
Reliable reference power supply is provided.
6. a kind of sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：Described second
Fault current detection device (1) includes magnetic core (2), surround the magnetic core (2) and is connected to the secondary coil of detection means (3)
(16), detection means (3) is connected with isolation circuit (4).
7. a kind of sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：The isolation
Electric routing capacitance and diode composition.
8. a kind of sensitive failture current protection device of alternating current-direct current according to claim 3, it is characterised in that：The comparison
Device A and comparator B can be substituted with operational amplifier and/or transistor amplifier.
9. a kind of sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：The power supply
(17) necessary power supply is provided for Fisrt fault current sensing means (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710764524.1A CN107332207A (en) | 2017-08-30 | 2017-08-30 | A kind of sensitive failture current protection device of alternating current-direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710764524.1A CN107332207A (en) | 2017-08-30 | 2017-08-30 | A kind of sensitive failture current protection device of alternating current-direct current |
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| Publication Number | Publication Date |
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| CN107332207A true CN107332207A (en) | 2017-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710764524.1A Pending CN107332207A (en) | 2017-08-30 | 2017-08-30 | A kind of sensitive failture current protection device of alternating current-direct current |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217232A (en) * | 2008-01-14 | 2008-07-09 | 王继杰 | A total current type residual current operating device with functions of automatic tripping on element failures |
| CN203261003U (en) * | 2013-05-20 | 2013-10-30 | 益而益(集团)有限公司 | Ground fault protection device |
| CN104459526A (en) * | 2014-11-27 | 2015-03-25 | 苏州上电科电气设备有限公司 | B-type residual current protecting circuit breaker testing device |
| CN104934931A (en) * | 2014-03-21 | 2015-09-23 | 上海电科电器科技有限公司 | Residual current protection device |
| CN105588970A (en) * | 2015-06-17 | 2016-05-18 | 陈小红 | Fault current detection device |
| CN207082830U (en) * | 2017-08-30 | 2018-03-09 | 乐清拓优电气有限公司 | A kind of sensitive failture current protection device of alternating current-direct current |
-
2017
- 2017-08-30 CN CN201710764524.1A patent/CN107332207A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217232A (en) * | 2008-01-14 | 2008-07-09 | 王继杰 | A total current type residual current operating device with functions of automatic tripping on element failures |
| CN203261003U (en) * | 2013-05-20 | 2013-10-30 | 益而益(集团)有限公司 | Ground fault protection device |
| CN104934931A (en) * | 2014-03-21 | 2015-09-23 | 上海电科电器科技有限公司 | Residual current protection device |
| CN104459526A (en) * | 2014-11-27 | 2015-03-25 | 苏州上电科电气设备有限公司 | B-type residual current protecting circuit breaker testing device |
| CN105588970A (en) * | 2015-06-17 | 2016-05-18 | 陈小红 | Fault current detection device |
| CN207082830U (en) * | 2017-08-30 | 2018-03-09 | 乐清拓优电气有限公司 | A kind of sensitive failture current protection device of alternating current-direct current |
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Application publication date: 20171107 |