CN210007482U - interphase power taking device capable of avoiding influence of single-phase earth fault - Google Patents
interphase power taking device capable of avoiding influence of single-phase earth fault Download PDFInfo
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- CN210007482U CN210007482U CN201921272710.4U CN201921272710U CN210007482U CN 210007482 U CN210007482 U CN 210007482U CN 201921272710 U CN201921272710 U CN 201921272710U CN 210007482 U CN210007482 U CN 210007482U
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Abstract
interphase electricity-taking device for avoiding single-phase earth fault influence, belonging to the field of power supply technology equipment and electric power automation, comprising a rectifier filter circuit and a voltage conversion circuit, wherein a power transmission line is connected to the rectifier filter circuit to obtain a direct current voltage signal, and the output end of the rectifier filter circuit is connected to the input end of the voltage conversion circuit.
Description
Technical Field
interphase power taking device for avoiding influence of single-phase earth faults, belonging to the field of power supply technical equipment and the field of electric power automation.
Background
However, when solar energy is adopted for power supply, the power supply voltage is greatly influenced by the intensity of sunlight and the ambient temperature, and the laser power supply scheme is difficult to widely applied at present and cannot be applied to outdoor remote areas temporarily, so that the limitation is large, and the current power supply from a power supply line becomes a common power supply solution.
At present, the method for getting electricity from a power supply line generally comprises the following two modes that a current transformer senses to get electricity and supply power from a line, and a traditional voltage transformer drops the electricity and supplies power from the line, however, in the power supply scheme of sensing to get electricity from the line, the influence of the current and the ground fault of the line is large, in the power supply scheme of dropping the electricity and supplying power from the line, the installation is inconvenient because the volume of the voltage transformer is large, and when the electricity is got from the power supply line, when the single-phase ground fault occurs to the line, the electricity can not be normally got, so that the electricity supply of corresponding equipment can be influenced, and the stability of a power transmission system can be influenced.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the deficiency of the prior art, providing kinds of phase lines and connecting into isolation transformer simultaneously, still can continuously supply power when the single-phase trouble takes place for the circuit, the interphase electricity taking device of avoiding single-phase earth fault influence that has improved transmission system stability.
The utility model provides a technical scheme that this avoid alternate electricity taking device of single-phase earth fault influence, including rectifier filter circuit and voltage conversion circuit, the alternating voltage signal of transmission line output obtains direct current voltage signal through rectifier filter circuit, and the direct current voltage signal of rectifier filter circuit output inserts voltage conversion circuit's input, is provided with isolation transformer, arbitrary double-phase line inserts isolation transformer's secondary side coils simultaneously in the transmission line, and isolation transformer's secondary side coil both ends are connected rectifier filter circuit, are provided with voltage stabilizing circuit at rectifier filter circuit's output, rectifier filter circuit's output is connected voltage stabilizing circuit's input, and voltage conversion circuit's input is connected to voltage stabilizing power supply's output.
Preferably, the two phase lines are respectively connected to the end of the secondary side coil of the isolation transformer through corresponding high-voltage capacitors, and the other end of the secondary side coil of the isolation transformer is grounded.
Preferably, an overvoltage protection device is further connected in parallel to two ends of the secondary side coil of the isolation transformer.
Preferably, damping resistors are connected to both ends of the other sets of secondary side coils of the isolation transformer.
Preferably, the rectification filter circuit comprises a full-wave rectification bridge circuit composed of diodes and a filter capacitor connected in parallel at two ends of the full-wave rectification bridge circuit.
Preferably, the voltage stabilizing circuit comprises a voltage dividing branch and an adjustable voltage stabilizing source which are connected in parallel between the positive electrode of the output end and the negative electrode of the output end of the rectifying and filtering circuit, the voltage obtained by voltage division of the voltage dividing branch is connected to the reference end of the adjustable voltage stabilizing source, and the voltage output by the output end of the adjustable voltage stabilizing source is connected to the voltage converting circuit.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
1. in the interphase power taking device for avoiding the influence of the single-phase earth fault, the two phase lines are simultaneously connected into the isolation transformer, so that power can be continuously supplied when the line has the single-phase fault, and the stability of a power transmission system is improved. Meanwhile, the method is suitable for interphase electricity taking of a neutral point ungrounded system and a non-effective grounded system.
2. By arranging the damping resistor on the secondary side of the isolation transformer, ferromagnetic resonance overvoltage generated by the isolation transformer can be quickly and effectively eliminated.
3. Different voltage outputs can be realized by arranging the adjustable voltage source in the voltage stabilizing circuit, so that steps are further carried out by using different voltage conversion circuits for matching, and finally, direct current power supplies with different voltage values are obtained to meet different requirements of users.
4. By using an isolation transformer, the problem of overvoltages entering the secondary loop is effectively isolated.
5. By arranging the overvoltage protection device, the overvoltage condition caused by lightning stroke and other reasons can be protected.
Drawings
Fig. 1 is a schematic block diagram of an interphase power taking device for avoiding the influence of a single-phase earth fault.
Fig. 2 is a schematic circuit diagram of an interphase power taking device for avoiding the influence of a single-phase earth fault.
Detailed Description
Fig. 1 to 2 are preferred embodiments of the present invention, and the following description of the present invention will be made with reference to fig. 1 to 2 for steps.
As shown in fig. 1-2, interphase power-taking devices for avoiding the influence of single-phase ground faults include an isolation transformer, a rectification filter circuit, a voltage stabilizing circuit and a voltage converting circuit, any two phases of three-phase lines of a power transmission line are respectively connected to an input end of the isolation transformer through a th high-voltage capacitor and a second high-voltage capacitor, an output end of the isolation transformer is connected to an input end of the rectification filter circuit, an output end of the rectification filter circuit is connected to an input end of the voltage stabilizing circuit, an output end of the voltage stabilizing circuit is connected to an input end of the voltage converting circuit, a power signal output by the output end of the voltage converting circuit supplies power to equipment such as an online monitoring system, and.
phase line voltage and second quadrant voltage are loaded to the input end ( secondary side) of the isolation transformer through high voltage capacitor and second high voltage capacitor, two output ends (two groups of secondary side coils) of the isolation transformer are connected with the input end of the rectification filter circuit and the damping circuit module, the rectification filter circuit arranges the AC voltage signal output by the secondary side of the isolation transformer into DC voltage signal, the DC voltage signal is stabilized in the allowed voltage range by the voltage stabilizing circuit, the voltage converting circuit converts the voltage signal sent by the voltage stabilizing circuit into the voltage signal needed by the equipment, the damping circuit module is realized by adopting damping resistor, and effectively adopts the common commercially available fast saturated damping resistor, which can eliminate the ferromagnetic resonance overvoltage generated by the isolation transformer quickly and effectively.
As shown in fig. 2, a voltage signal V1 and a voltage signal V2 are respectively voltage signals output by any two phases of the power transmission line, the voltage signal V1 is connected to an end of a capacitor C1, the voltage signal V2 is connected to a end of a capacitor C2, another end of the capacitors C1 to C2 is simultaneously connected to an end of a secondary side coil of an isolation transformer B1 , another end of the secondary side coil of the isolation transformer B1 is grounded, two ends of the secondary side coil of the isolation transformer B1 are also connected in parallel with an overvoltage protection device U1, the overvoltage protection device U1 can be implemented by a gas discharge gap or a zinc oxide arrester, and the capacitors C1 to C2 are respectively the -th high-voltage capacitor and the second high-voltage capacitor.
Two ends of a group of secondary side coils of the isolation transformer B1 are connected with two ends of a resistor R1, the resistor R1 is the damping circuit module, two ends of a group of secondary side coils of the isolation transformer B1 are connected to input ends of a rectifier bridge circuit, the rectifier bridge circuit is a full-wave rectifier circuit formed by diodes D1-D4, a capacitor C3 is connected in parallel between output ends of the rectifier bridge circuit, the rectifier bridge circuit formed by diodes D1-D4 and a capacitor C3 playing a filtering role form the rectifier filter circuit.
A voltage division branch formed by connecting resistors R2-R3 in series and a voltage stabilizing device D5 are connected in parallel between the output positive electrode and the output negative electrode of the rectifier bridge circuit, and the voltage stabilizing device D5 is realized by a controllable precise voltage stabilizing source with the model number of TL 431. The cathode of the voltage stabilizing device D5 is connected with the output anode of the rectifier bridge circuit, the anode of the voltage stabilizing device D5 is connected with the output cathode of the rectifier bridge circuit, and the reference electrode of the voltage stabilizing device D5 is connected between the resistors R2-R3. The voltage across the voltage regulator device D5 (TL 431) depends on the resistance values of the resistors R2 to R3, and it is known in the art that the voltage U = (1 + R2/R3) · 2.5V at the output terminal of the voltage regulator device D5, so that the output terminal voltage of the voltage regulator device D5 can be within the required operating voltage range at the input terminal of the voltage conversion circuit by adjusting the resistance values of the resistors R2 to R3. The resistors R2-R3 and the voltage regulator device D5 form the voltage regulator circuit.
The voltage of the output end of the voltage stabilizing device D5 is connected to the input end of the voltage stabilizing chip U2, the voltage stabilizing chip U2 can be realized by a common DC/DC voltage stabilizing chip sold in the market according to the power supply requirement of the power supply equipment, the voltage stabilizing chip U2 is the voltage conversion module, and the voltage signal output by the voltage stabilizing chip U2 is used for supplying power to the electrical appliance U3.
The specific working process and principle are as follows:
voltage signals V1-V2 output by any two phases of a power transmission line are loaded to a secondary side coil of an isolation transformer B1 through capacitors C1-C2 respectively, voltage signals output by a secondary side coil of the isolation transformer B1 are processed by a rectifier bridge circuit and filtered by a filter capacitor C3 to obtain direct-current voltage signals, the voltage signals output from two ends of the filter capacitor C3 are simultaneously loaded to a voltage dividing branch formed by serially connecting resistors R2-R3, the voltage dividing signals obtained through the resistance ratio of the resistors R2-R3 are connected to a reference end of a voltage stabilizing device D5, the voltage stabilizing device D5 outputs corresponding voltage signals according to the voltage signals connected to the reference end of the voltage stabilizing device D5 and connects the voltage signals to a voltage stabilizing chip U2, and the voltage signals output by the voltage stabilizing chip U2 supply power to electrical appliances.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (6)
- The interphase electricity taking device capable of avoiding the influence of the single-phase ground fault comprises a rectifying filter circuit and a voltage conversion circuit, wherein alternating-current voltage signals output by a power transmission line obtain direct-current voltage signals through the rectifying filter circuit, and the direct-current voltage signals output by the rectifying filter circuit are connected to the input end of the voltage conversion circuit.
- 2. The inter-phase power taking device capable of avoiding the influence of the single-phase ground fault according to claim 1, wherein the two phase lines are respectively connected with a end of a secondary side coil of an isolation transformer through corresponding high-voltage capacitors, and the other end of the secondary side coil of the isolation transformer is grounded.
- 3. The inter-phase power taking device for avoiding the influence of the single-phase ground fault as claimed in claim 1 or 2, wherein an overvoltage protection device is further connected in parallel to two ends of the secondary side coil of the isolation transformer.
- 4. The inter-phase power taking device for avoiding the influence of the single-phase ground fault as claimed in claim 1, wherein damping resistors are connected to two ends of another sets of secondary side coils of the isolation transformer.
- 5. The interphase power taking device for avoiding the influence of the single-phase earth fault according to claim 1, characterized in that: the rectification filter circuit comprises a full-wave rectification bridge circuit consisting of diodes and filter capacitors connected in parallel at two ends of the full-wave rectification bridge circuit.
- 6. The interphase power taking device for avoiding the influence of the single-phase earth fault according to claim 1, characterized in that: the voltage stabilizing circuit comprises a voltage dividing branch and an adjustable voltage stabilizing source which are connected in parallel between the positive electrode of the output end and the negative electrode of the output end of the rectifying and filtering circuit, voltage obtained by voltage division of the voltage dividing branch is connected to the reference end of the adjustable voltage stabilizing source, and voltage output by the output end of the adjustable voltage stabilizing source is connected to the voltage converting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921272710.4U CN210007482U (en) | 2019-08-07 | 2019-08-07 | interphase power taking device capable of avoiding influence of single-phase earth fault |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921272710.4U CN210007482U (en) | 2019-08-07 | 2019-08-07 | interphase power taking device capable of avoiding influence of single-phase earth fault |
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| CN210007482U true CN210007482U (en) | 2020-01-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701805A (en) * | 2020-11-20 | 2021-04-23 | 国电南瑞科技股份有限公司 | High-voltage power taking unit and device applied to power distribution network |
| CN113258801A (en) * | 2020-02-12 | 2021-08-13 | 新疆金风科技股份有限公司 | Direct current gets electric installation, system and wind generating set's start control system |
-
2019
- 2019-08-07 CN CN201921272710.4U patent/CN210007482U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258801A (en) * | 2020-02-12 | 2021-08-13 | 新疆金风科技股份有限公司 | Direct current gets electric installation, system and wind generating set's start control system |
| CN112701805A (en) * | 2020-11-20 | 2021-04-23 | 国电南瑞科技股份有限公司 | High-voltage power taking unit and device applied to power distribution network |
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