CN101871989A - Voltage and current regulating device for use in grounding fault diagnosis of medium-voltage distribution network - Google Patents
Voltage and current regulating device for use in grounding fault diagnosis of medium-voltage distribution network Download PDFInfo
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- CN101871989A CN101871989A CN200910049841A CN200910049841A CN101871989A CN 101871989 A CN101871989 A CN 101871989A CN 200910049841 A CN200910049841 A CN 200910049841A CN 200910049841 A CN200910049841 A CN 200910049841A CN 101871989 A CN101871989 A CN 101871989A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to a voltage and current regulating device for use in the grounding fault diagnosis of a medium-voltage distribution network. One end of the regulating device is connected with an external power grid, while the other end is connected with a grounding fault diagnosis device. The regulating device comprises a voltage regulating circuit, a current regulating circuit, a neutral point voltage regulating and signal interrupting circuit, an I/O regulating circuit and a power supply module, which are connected between the external power grid and the grounding fault diagnosis device. The device converts the high voltage and heavy current of the power grid into a low voltage and a small current, filters the power grid and the grounding fault diagnosis device, filters signal interference and improves accuracy.
Description
Technical field
The present invention relates to a kind of voltage, current regulating device, relate in particular to a kind of voltage, current regulating device that is used for the medium voltage distribution network grounding fault diagnosis.
Background technology
At present, in the medium voltage distribution network, earth fault diagnostic equipment is directly from the electrical network received signal, between electrical network and earth fault diagnostic equipment, there is not spacer assembly, therefore can't filter undesired signal, and high voltage, big current conversion can not be become low-voltage, little electric current, overtension or electric current are excessive, can impact earth fault diagnostic equipment.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the present invention aims to provide a kind of voltage, current regulating device that is used for the medium voltage distribution network grounding fault diagnosis, to realize isolating the purpose of electrical network and earth fault diagnostic equipment, and interference that can trap signal, with high voltage, big current conversion is low-voltage, little electric current, has improved security.
A kind of voltage, current regulating device that is used for the medium voltage distribution network grounding fault diagnosis of the present invention, one end of this conditioning device is connected with external electrical network, the other end is connected with earth fault diagnostic equipment, described conditioning device comprises voltage modulate circuit, current regulating circuit, the neutral point voltage conditioning and look-at-me circuit, I/O modulate circuit and power module that is connected between described external electrical network and the earth fault diagnostic equipment
Described voltage modulate circuit will convert low-voltage to from the high voltage that described electrical network receives, and filter undesired signal;
Described current regulating circuit will become little electric current from the big current conversion that described electrical network receives, and filter undesired signal;
The neutral point voltage of described electrical network is calculated and nursed one's health to described neutral point voltage conditioning with the look-at-me circuit, and by comparing with predetermined threshold value, trigger look-at-me;
The conditioning of described I/O modulate circuit and transmit described electrical network the I/O signal;
Described power module comprises four independently power supply submodules, and this each power supply submodule is respectively independently to described voltage modulate circuit, current regulating circuit, neutral point voltage conditioning and look-at-me circuit and the power supply of I/O modulate circuit.
At the above-mentioned voltage that is used for the medium voltage distribution network grounding fault diagnosis, current regulating device, described neutral point voltage conditioning comprises that with the look-at-me circuit first follower, low-pass filter, first voltage comparator, the threshold value that are connected successively produce the circuit and second voltage comparator, described first voltage comparator is connected with second voltage comparator
The input end of described first follower is connected in parallel to the diode of two connections parallel with one another, and this diode produces a clamping voltage;
Described low-pass filter filters the voltage signal from described first follower output, eliminates undesired signal;
Described first voltage comparator compares processing to the voltage signal from described low-pass filter output, and the output neutral point voltage produces the circuit and second voltage comparator to described threshold value;
Described threshold value produces circuit and comprises a toggle switch, by this toggle switch setting threshold, and outputs to described second voltage comparator;
Threshold value that receives and the neutral point voltage that receives from first voltage comparator compare described second voltage comparator to produce circuit from threshold value, and export corresponding look-at-me.
At the above-mentioned voltage that is used for the medium voltage distribution network grounding fault diagnosis, current regulating device, described threshold value produces circuit and also comprises electrochemical capacitor, first resistance, second resistance, the 3rd resistance and the slide rheostat that connects successively, and the different pin of described toggle switch is connected respectively between described first resistance and second resistance, between second resistance and the 3rd resistance, between the 3rd resistance and the slide rheostat.
At the above-mentioned voltage that is used for the medium voltage distribution network grounding fault diagnosis, current regulating device; described voltage modulate circuit comprises voltage amplifier circuit, voltage filter circuit, voltage follower and the voltage-limiting protection circuit that connects successively; the input end of described voltage amplifier circuit also is parallel with a wire jumper, and this wire jumper will change into voltage signal from the current signal that described electrical network receives.
At the above-mentioned voltage that is used for the medium voltage distribution network grounding fault diagnosis, current regulating device, described current regulating circuit comprises current amplification circuit, current filtering circuit, current follower and the current-limiting protection circuit that connects successively.
At the above-mentioned voltage that is used for the medium voltage distribution network grounding fault diagnosis, current regulating device, described conditioning device is connected with described earth fault diagnostic equipment by bus.
Owing to adopted above-mentioned technical solution, circuit such as the voltage modulate circuit among the present invention, current regulating circuit all have dual photoelectricity isolates and pressure limiting/stream defencive function, wherein, the zero input impedance of current regulating circuit design, to outside current return without any influence; The neutral point voltage conditioning can directly be risen by adjusting slide rheostat realization neutral point voltage with the look-at-me circuit and be triggered look-at-me; In addition, supporting bus expansion of the present invention, can pass through bus, with a plurality of conditioning devices and link electrical network and earth fault diagnostic equipment between, realized the high voltage of electrical network, big current conversion are become low-voltage, little electric current, and can isolate electrical network and earth fault diagnostic equipment, trap signal disturbs, and has improved precision.
Description of drawings
Fig. 1 is a kind of voltage of medium voltage distribution network grounding fault diagnosis, structural representation of current regulating device of being used for of the present invention;
Fig. 2 is the circuit diagram of neutral point voltage conditioning of the present invention and look-at-me circuit;
Fig. 3 is the circuit diagram of voltage modulate circuit of the present invention;
Fig. 4 is the circuit diagram of current regulating circuit of the present invention;
Fig. 5 is the circuit diagram of I/O modulate circuit of the present invention;
Fig. 6 is an independent circuit diagram of nursing one's health the power supply submodule of powering with look-at-me circuit and I/O modulate circuit to voltage modulate circuit, current regulating circuit, neutral point voltage in the power module of the present invention.
Embodiment
Below in conjunction with accompanying drawing a kind of voltage, current regulating device that is used for the medium voltage distribution network grounding fault diagnosis of the present invention is described further.
As shown in Figure 1, one end of conditioning device 1 of the present invention is connected with external electrical network, the other end is connected with earth fault diagnostic equipment 10 by bus, conditioning device 1 comprises voltage modulate circuit 11, current regulating circuit 12, the neutral point voltage conditioning and look-at-me circuit 13, I/O modulate circuit 14 and power module 15 that is connected between external electrical network and the earth fault diagnostic equipment 10, wherein
The high voltage that voltage modulate circuit 11 is used for receiving from electrical network converts low-voltage to, and filtration undesired signal, it comprises voltage amplifier circuit 111, voltage filter circuit 112, voltage follower 113 and the voltage-limiting protection circuit 114 that connects successively, the input end of voltage amplifier circuit 111 also is parallel with a wire jumper JM1, and this wire jumper JM1 will change into voltage signal from the current signal that electrical network receives; In the present embodiment, voltage amplifier circuit 111, voltage filter circuit 112, voltage follower 113 and voltage-limiting protection circuit 114 are custom circuit.
The big current conversion that current regulating circuit 12 is used for receiving from electrical network becomes little electric current, and filters undesired signal, and it comprises current amplification circuit 121, current filtering circuit 122, current follower 123 and the current-limiting protection circuit 124 that connects successively; In the present embodiment, current amplification circuit 121, current filtering circuit 122, current follower 123 and current-limiting protection circuit 124 are custom circuit.Current regulating circuit 12 is zero input impedance design, to outside current return without any influence.
Neutral point voltage conditioning and look-at-me circuit 13 are used to calculate and nurse one's health the neutral point voltage of electrical network, and by comparing with predetermined threshold value, trigger look-at-me, it comprises that first follower 131, low-pass filter 132, first voltage comparator 133, the threshold value that connect successively produce the circuit 134 and second voltage comparator 135, first voltage comparator 133 also is connected with second voltage comparator 135, wherein
The input end of first follower 131 is connected in parallel to diode D1, the D2 of two connections parallel with one another, and this diode D1, D2 are used to produce a clamping voltage;
Low-pass filter 132 is used for the voltage signal from 131 outputs of first follower is filtered, and eliminates undesired signal;
133 pairs of voltage signals from low-pass filter 132 outputs of first voltage comparator compare processing, and the output neutral point voltage produces the circuit 134 and second voltage comparator 135 to threshold value;
Threshold value produces circuit 134 and comprises a toggle switch S1 and the electrochemical capacitor E1 that is connected successively, first resistance R 61, second resistance R 62, the 3rd resistance R 63 and slide rheostat P1, the different pin of toggle switch S1 is connected respectively between first resistance R 61 and second resistance R 62, between second resistance R 62 and the 3rd resistance R 63, between the 3rd resistance R 63 and the slide rheostat P1, slide rheostat P1 also is connected with a 12V power supply, threshold value produces circuit 134 by toggle switch S1 setting threshold, and outputs to second voltage comparator 135;
In the present embodiment, first follower 131, low-pass filter 132, first voltage comparator 133 and second voltage comparator 135 in neutral point voltage conditioning and the look-at-me circuit 13 are custom circuit.
I/O modulate circuit 14 be used to nurse one's health and transmit electrical network the I/O signal; In the present embodiment, I/O modulate circuit 14 is a custom circuit
In sum; all having in all circuit among the present invention has dual photoelectricity to isolate and the voltage-limiting protection function; and supporting bus expansion of the present invention; can pass through bus; with a plurality of conditioning devices 1 and link electrical network and earth fault diagnostic equipment 10 between, thereby realized the high voltage of electrical network, big current conversion are become low-voltage, little electric current, and can isolate electrical network and earth fault diagnostic equipment; trap signal disturbs, and has improved precision.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (6)
1. voltage, current regulating device that is used for the medium voltage distribution network grounding fault diagnosis, one end of this conditioning device is connected with external electrical network, the other end is connected with earth fault diagnostic equipment, it is characterized in that: described conditioning device comprises voltage modulate circuit, current regulating circuit, the neutral point voltage conditioning and look-at-me circuit, I/O modulate circuit and power module that is connected between described external electrical network and the earth fault diagnostic equipment
Described voltage modulate circuit will convert low-voltage to from the high voltage that described electrical network receives, and filter undesired signal;
Described current regulating circuit will become little electric current from the big current conversion that described electrical network receives, and filter undesired signal;
The neutral point voltage of described electrical network is calculated and nursed one's health to described neutral point voltage conditioning with the look-at-me circuit, and by comparing with predetermined threshold value, trigger look-at-me;
The conditioning of described I/O modulate circuit and transmit described electrical network the I/O signal;
Described power module comprises four independently power supply submodules, and this each power supply submodule is respectively independently to described voltage modulate circuit, current regulating circuit, neutral point voltage conditioning and look-at-me circuit and the power supply of I/O modulate circuit.
2. voltage, the current regulating device that is used for the medium voltage distribution network grounding fault diagnosis according to claim 1, it is characterized in that, described neutral point voltage conditioning comprises that with the look-at-me circuit first follower, low-pass filter, first voltage comparator, the threshold value that are connected successively produce the circuit and second voltage comparator, described first voltage comparator is connected with second voltage comparator
The input end of described first follower is connected in parallel to the diode of two connections parallel with one another, and this diode produces a clamping voltage;
Described low-pass filter filters the voltage signal from described first follower output, eliminates undesired signal;
Described first voltage comparator compares processing to the voltage signal from described low-pass filter output, and the output neutral point voltage produces the circuit and second voltage comparator to described threshold value;
Described threshold value produces circuit and comprises a toggle switch, by this toggle switch setting threshold, and outputs to described second voltage comparator;
Threshold value that receives and the neutral point voltage that receives from first voltage comparator compare described second voltage comparator to produce circuit from threshold value, and export corresponding look-at-me.
3. voltage, the current regulating device that is used for the medium voltage distribution network grounding fault diagnosis according to claim 1 and 2, it is characterized in that, described threshold value produces circuit and also comprises electrochemical capacitor, first resistance, second resistance, the 3rd resistance and the slide rheostat that connects successively, and the different pin of described toggle switch is connected respectively between described first resistance and second resistance, between second resistance and the 3rd resistance, between the 3rd resistance and the slide rheostat.
4. voltage, the current regulating device that is used for the medium voltage distribution network grounding fault diagnosis according to claim 1 and 2; it is characterized in that; described voltage modulate circuit comprises voltage amplifier circuit, voltage filter circuit, voltage follower and the voltage-limiting protection circuit that connects successively; the input end of described voltage amplifier circuit also is parallel with a wire jumper, and this wire jumper will change into voltage signal from the current signal that described electrical network receives.
5. voltage, the current regulating device that is used for the medium voltage distribution network grounding fault diagnosis according to claim 1 and 2; it is characterized in that described current regulating circuit comprises current amplification circuit, current filtering circuit, current follower and the current-limiting protection circuit that connects successively.
6. voltage, the current regulating device that is used for the medium voltage distribution network grounding fault diagnosis according to claim 1 is characterized in that described conditioning device is connected with described earth fault diagnostic equipment by bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910049841A CN101871989A (en) | 2009-04-23 | 2009-04-23 | Voltage and current regulating device for use in grounding fault diagnosis of medium-voltage distribution network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910049841A CN101871989A (en) | 2009-04-23 | 2009-04-23 | Voltage and current regulating device for use in grounding fault diagnosis of medium-voltage distribution network |
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| CN101871989A true CN101871989A (en) | 2010-10-27 |
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| CN200910049841A Pending CN101871989A (en) | 2009-04-23 | 2009-04-23 | Voltage and current regulating device for use in grounding fault diagnosis of medium-voltage distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818969A (en) * | 2011-06-07 | 2012-12-12 | 施耐德电器工业公司 | Directional detection of resistive earth fault and medium-voltage conductor breakage |
| CN104297639A (en) * | 2014-11-07 | 2015-01-21 | 广东电网有限责任公司电力科学研究院 | Fault traveling wave collecting device and system for medium voltage distribution network |
-
2009
- 2009-04-23 CN CN200910049841A patent/CN101871989A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818969A (en) * | 2011-06-07 | 2012-12-12 | 施耐德电器工业公司 | Directional detection of resistive earth fault and medium-voltage conductor breakage |
| CN102818969B (en) * | 2011-06-07 | 2017-06-09 | 施耐德电器工业公司 | Detection location equipment, the method and system of the resistive ground failure of medium voltage network |
| CN104297639A (en) * | 2014-11-07 | 2015-01-21 | 广东电网有限责任公司电力科学研究院 | Fault traveling wave collecting device and system for medium voltage distribution network |
| CN104297639B (en) * | 2014-11-07 | 2017-02-15 | 广东电网有限责任公司电力科学研究院 | Fault traveling wave collecting device and system for medium voltage distribution network |
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Application publication date: 20101027 |