CN201388054Y - Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network - Google Patents
Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network Download PDFInfo
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- CN201388054Y CN201388054Y CN200920070998U CN200920070998U CN201388054Y CN 201388054 Y CN201388054 Y CN 201388054Y CN 200920070998 U CN200920070998 U CN 200920070998U CN 200920070998 U CN200920070998 U CN 200920070998U CN 201388054 Y CN201388054 Y CN 201388054Y
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- voltage
- circuit
- current
- conditioning
- fault diagnosis
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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 utility model relates to a voltage and current conditioning device used for earth fault diagnosis of a medium-voltage distribution network. One end of the conditioning device is connected with an external electric network and the other end is connected with an earth fault diagnosis device. The conditioning device comprises a voltage conditioning circuit, a current conditioning circuit, a neutral point voltage conditioning and interrupt signal circuit, an I/O conditioning circuit and a power module which are connected between the external electric network and the earth fault diagnosis device. The conditioning device realizes the conversion from the high voltage and heavy current of the electric network to low voltage and low current, and can isolate the electric network from the earth fault diagnosis device, filter the interference of a signal and improve the accuracy.
Description
Technical field
The utility model relates to a kind of voltage, current regulating device, relates 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 interference 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.
The utility model content
In order to overcome the deficiency that above-mentioned prior art exists, the utility model 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 fail safe.
A kind of voltage, current regulating device that is used for the medium voltage distribution network grounding fault diagnosis described in the utility model, 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 interrupt signal 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 interference signal;
Described current regulating circuit will become little electric current from the big current conversion that described electrical network receives, and filter interference signal;
The neutral point voltage of described electrical network is calculated and nursed one's health to described neutral point voltage conditioning with the interrupt signal circuit, and by comparing with predetermined threshold value, trigger interrupt signal;
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 interrupt signal 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 interrupt signal 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 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 interference 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 interrupt signal.
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 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 in the utility model, 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 circuit without any influence; The neutral point voltage conditioning can directly be risen by adjusting slide rheostat realization neutral point voltage with the interrupt signal circuit and be triggered interrupt signal; In addition, the expansion of the utility model supporting bus, 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 utility model;
Fig. 2 is the circuit diagram of neutral point voltage conditioning of the present utility model and interrupt signal circuit;
Fig. 3 is the circuit diagram of voltage modulate circuit of the present utility model;
Fig. 4 is the circuit diagram of current regulating circuit of the present utility model;
Fig. 5 is the circuit diagram of I/O modulate circuit of the present utility model;
Fig. 6 is an independent circuit diagram of nursing one's health the power supply submodule of powering with interrupt signal circuit and I/O modulate circuit to voltage modulate circuit, current regulating circuit, neutral point voltage in the power module of the present utility model.
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 utility model is described further.
As shown in Figure 1, one end of conditioning device 1 of the present utility model 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 interrupt signal 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 interference 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 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 interference 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 circuit without any influence.
Neutral point voltage conditioning and interrupt signal 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 interrupt signal, 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 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;
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 interrupt signal 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 in the utility model has dual photoelectricity to isolate and the voltage-limiting protection function; and the utility model supporting bus expansion; 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 utility model in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the utility model according to the above description.Thereby some details among the embodiment should not constitute qualification of the present utility model, and the scope that the utility model will define with appended claims is as protection range of the present utility model.
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 interrupt signal 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 interference signal;
Described current regulating circuit will become little electric current from the big current conversion that described electrical network receives, and filter interference signal;
The neutral point voltage of described electrical network is calculated and nursed one's health to described neutral point voltage conditioning with the interrupt signal circuit, and by comparing with predetermined threshold value, trigger interrupt signal;
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 interrupt signal 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 interrupt signal 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 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 interference 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 interrupt signal.
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 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 |
|---|---|---|---|
| CN200920070998U CN201388054Y (en) | 2009-04-23 | 2009-04-23 | Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920070998U CN201388054Y (en) | 2009-04-23 | 2009-04-23 | Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network |
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| Publication Number | Publication Date |
|---|---|
| CN201388054Y true CN201388054Y (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920070998U Expired - Lifetime CN201388054Y (en) | 2009-04-23 | 2009-04-23 | Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network |
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| CN (1) | CN201388054Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749476A (en) * | 2013-12-25 | 2015-07-01 | 国家电网公司 | Grounding detection device and grounding detection method |
-
2009
- 2009-04-23 CN CN200920070998U patent/CN201388054Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749476A (en) * | 2013-12-25 | 2015-07-01 | 国家电网公司 | Grounding detection device and grounding detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI ELECTRIC POWER CORP. Free format text: FORMER OWNER: SHANGHAI SOUTH POWER SUPPLY DESIGN CO., LTD. Effective date: 20130624 Owner name: SHANGHAI SOUTH POWER SUPPLY DESIGN CO., LTD. SHANG Free format text: FORMER OWNER: SHANGHAI JIAO TONG UNIVERSITY Effective date: 20130624 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 200233 XUHUI, SHANGHAI TO: 200122 PUDONG NEW AREA, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130624 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Patentee after: Shanghai Electric Power Corporation Patentee after: Shanghai South Power Supply Design Co., Ltd. Patentee after: Shanghai Jiao Tong University Address before: 200233 No. 222, Qin Jiang Road, Shanghai, Xuhui District Patentee before: Shanghai South Power Supply Design Co., Ltd. Patentee before: Shanghai Jiao Tong University |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100120 |