CN213875994U - Power distribution network intermittent ground fault simulation device - Google Patents
Power distribution network intermittent ground fault simulation device Download PDFInfo
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- CN213875994U CN213875994U CN202022562023.5U CN202022562023U CN213875994U CN 213875994 U CN213875994 U CN 213875994U CN 202022562023 U CN202022562023 U CN 202022562023U CN 213875994 U CN213875994 U CN 213875994U
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Abstract
The utility model discloses a distribution network intermittent type nature earth fault's analogue means, including high voltage power supply, insulating liquid container, high-voltage electrode, earth potential electrode, simulation transition resistance and insulating liquid. The high-voltage electrode is arranged on one side wall of the insulating liquid container, a first terminal of the high-voltage electrode is positioned outside the insulating liquid container, and a second terminal of the high-voltage electrode is positioned inside the insulating liquid container. The ground potential electrode is arranged on the other side wall of the insulating liquid container and is separated from the high voltage electrode through the insulating liquid. One end of the ground potential electrode is grounded through the analog transition resistor. In the fault simulation test process, the first wiring terminal of the high-voltage electrode is connected with the high-voltage power supply, the intermittent single-phase earth fault of the liquid insulation of the power distribution network can be simulated, and the simulation device is simple in structure and convenient to operate.
Description
Technical Field
The utility model relates to a distribution network technical field especially relates to a distribution network intermittent type nature ground fault's analogue means.
Background
The power distribution network is an energy transmission network related to the national civilization, intermittent single-phase earth faults often occur in the operation of the power distribution network, and the power distribution network is characterized in that a fault electric arc is reignited or extinguished along with the change of an external environment. When the dielectric strength of the fault point exceeds the electric field, the arc tends to extinguish; when the dielectric strength of the fault point is lower than the electric field, the arc reignites.
In the prior art, intermittent earth faults are detected and isolated. Various ground fault detection devices have been developed. In order to test the accuracy and reliability of these ground fault detection devices, power enterprises and detection mechanisms need to simulate actual intermittent fault scenes to carry out fault actual measurement. However, the inventors found that: the intermittent fault has the characteristic of sporadic nature, and the prior art lacks a method capable of simulating and reproducing an intermittent fault scene, so that the process of testing the accuracy and the reliability of the ground fault detection device is hindered.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a distribution network intermittent type nature ground fault's analogue means, it can conveniently simulate the single-phase ground fault of intermittent type nature among the distribution network liquid insulation, and simple structure, safety, easily operation.
In order to achieve the above object, an embodiment of the present invention provides a power distribution network intermittent ground fault simulation apparatus, including: the device comprises a high-voltage power supply 1, an insulating liquid container 2, a high-voltage electrode 3, a ground potential electrode 4, a simulation transition resistor 5 and insulating liquid 6;
the insulating liquid 6 is contained in the insulating liquid container 2;
the high-voltage electrode 3 is arranged on one side wall of the insulating liquid container 2, the high-voltage electrode 3 is provided with two terminals, and a first terminal 31 is positioned outside the insulating liquid container 2 and is used for being connected with the high-voltage power supply 1; the second terminal 32 is positioned inside the insulating liquid container 2 and is in contact with the insulating liquid 6;
the ground potential electrode 4 is arranged on the other side wall of the insulating liquid container 2 and is isolated from the high voltage electrode 3 through the insulating liquid 6;
one end of the analog transition resistor 5 is connected with one end of the ground potential electrode 4, and the other end of the analog transition resistor 5 is grounded.
As a modification of the above solution, the side wall of the insulating liquid container 2 where the high voltage electrode 3 is arranged is obliquely arranged.
As a modification of the above solution, the high voltage electrode 3 is plural, and each high voltage electrode 3 is arranged on the obliquely arranged side wall of the insulating liquid container 2 at a predetermined interval.
As an improvement of the above scheme, the simulation device for intermittent earth fault of the power distribution network further comprises a switch 7; the first terminal 31 of the high voltage electrode 3 is connected to the high voltage power supply 1 via the input switch 7.
As an improvement of the scheme, the second terminal of the high-voltage electrode 3 is a rod electrode, a pin electrode or a flat electrode.
As an improvement of the above scheme, the ground potential electrode 4 is made of a metal material.
As an improvement of the above scheme, the insulating liquid 6 is insulating oil for a distribution transformer.
As a modification of the above, the insulating liquid inlet 21 is provided above the insulating liquid container 2, and the insulating liquid outlet 22 is provided below the insulating liquid container.
Compared with the prior art, the utility model discloses a distribution network intermittent type nature ground fault's analogue means, including high voltage power supply, insulating liquid container, a plurality of high-voltage electrode, earth potential electrode, simulation transition resistance, insulating liquid and input switch. The insulating liquid is contained in the insulating liquid container; the high-voltage electrodes are arranged on an obliquely arranged side wall of the insulating liquid container at intervals, each high-voltage electrode is provided with two terminals, and a first terminal is positioned outside the insulating liquid container and is connected with the high-voltage power supply through the input switch; the second terminal is located inside the insulating liquid container and is in contact with the insulating liquid. The ground potential electrode is arranged on the other side wall of the insulating liquid container and is isolated from the high voltage electrode through the insulating liquid; one end of the analog transition resistor is connected with one end of the ground potential electrode, and the other end of the analog transition resistor is grounded. The embodiment of the utility model provides a distribution network intermittent type nature earth fault's analogue means, it can select suitable high-voltage electrode to carry out fault simulation according to the actual fault condition, can effectively simulate distribution network liquid insulation intermittent type nature single-phase earth fault. The simulation device has a simple structure, and the operation process is convenient and safe. Through simulating intermittent fault scene, assist electric power enterprise and detection mechanism to develop the trouble actual measurement, be favorable to testing ground fault detection device's accuracy and reliability.
Drawings
Fig. 1 is a schematic structural diagram of an intermittent ground fault simulation device for a power distribution network according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a preferred simulation apparatus for intermittent ground fault of a power distribution network according to an embodiment of the present invention;
in the figure, 1, a high-voltage power supply; 2. insulating liquid capacity; 21. an insulating liquid inlet; 22. an insulating liquid outlet; 3. a high voltage electrode; 31. a first terminal; 32. a second terminal; 4. a ground potential electrode; 5. simulating a transition resistance; 6. insulating liquid; 7. and (6) switching into a switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of an apparatus for simulating an intermittent ground fault of a power distribution network according to an embodiment of the present invention is provided. The embodiment of the utility model provides a pair of distribution network intermittent type nature ground fault's analogue means, include: the device comprises a high-voltage power supply 1, an insulating liquid container 2, a high-voltage electrode 3, a ground potential electrode 4, a simulation transition resistor 5 and insulating liquid 6.
The insulating liquid 6 is contained in the insulating liquid container 2; the high-voltage electrode 3 is arranged on one side wall of the insulating liquid container 2, the high-voltage electrode 3 is provided with two terminals, and a first terminal 31 is positioned outside the insulating liquid container 2 and is used for being connected with the high-voltage power supply 1; the second terminal 32 is positioned inside the insulating liquid container 2 and is in contact with the insulating liquid 6; the ground potential electrode 4 is arranged on the other side wall of the insulating liquid container 2 and is isolated from the high voltage electrode 3 through the insulating liquid 6; one end of the analog transition resistor 5 is connected with one end of the ground potential electrode 4, and the other end of the analog transition resistor 5 is grounded.
The embodiment of the utility model provides an in, high voltage power supply 1 is the single-phase voltage source of distribution network for simulate 10 ~ 35 kV's single-phase voltage. In the fault simulation process, the test voltage of the high-voltage power supply 1 can be adjusted according to actual needs.
The insulating liquid container 2 is made of insulating materials and used for containing insulating liquid 6, and the insulating liquid 6 is transformer insulating oil commonly used by distribution transformers. In an alternative embodiment, the insulating liquid 6 is an alkane material.
The high-voltage electrode 3 is fixed on the insulating liquid container 2, the first connecting terminal 32 is connected with the high-voltage power supply 1, and the second connecting terminal 32 is in contact with the insulating liquid 6 in the insulating liquid container 2 and is a rod electrode, a needle electrode or a flat electrode.
The ground potential electrode 4 is made of metal, is tightly attached to one side of the insulating liquid 6, is isolated from the high-voltage electrode 3 through the insulating liquid 6 to form a rod-plate electrode, a needle-plate electrode or a plate-plate electrode, and one end of the ground potential electrode 4 is connected with a grounding grid through the analog transition resistor 5.
As an alternative embodiment, the ground potential electrode 4 is in the form of a foil with a square or circular shape.
The simulation transition resistor 5 is made of fixed resistors, gravels, trees and the like and is used for simulating the ground fault of the power distribution network passing through the transition resistor.
The working principle of the simulation device for the intermittent earth fault of the power distribution network is as follows: when an intermittent ground fault simulation test is carried out, the high-voltage power supply 1 is adjusted to a proper test voltage, the first wiring terminal 31 of the high-voltage electrode 3 is connected with the high-voltage power supply 1, and when the critical electric field intensity is reached in a gap of transformer insulating oil in the insulating liquid container 2, intermittent discharge is formed along with the change of a sine voltage amplitude value and periodic zero crossing.
The embodiment of the utility model provides a distribution network intermittent type nature ground fault's analogue means is provided, including high voltage power supply, insulating liquid container, high-voltage electrode, earth potential electrode, simulation transition resistance and insulating liquid, can effectively simulate distribution network liquid insulation intermittent type nature single-phase ground fault. The simulation device is simple in structure and convenient to operate. Through simulating intermittent fault scene, assist electric power enterprise and detection mechanism to develop the trouble actual measurement, be favorable to testing ground fault detection device's accuracy and reliability.
Fig. 2 is a schematic structural diagram of a preferred simulation apparatus for intermittent ground fault of a power distribution network according to an embodiment of the present invention. The side wall of the insulating liquid container 2, on which the high-voltage electrode 3 is arranged, is obliquely arranged. The number of the high-voltage electrodes 3 is multiple, and each high-voltage electrode 3 is arranged on the side wall of the insulating liquid container 2, which is obliquely arranged, according to a preset interval.
In one mode, the number of the high voltage electrodes 3 is set to 5, and the high voltage electrodes are arranged on the obliquely arranged side wall of the insulating liquid container 2 at intervals, so that the distances between the high voltage electrodes 3 and the ground potential electrodes 4 are respectively 2cm, 3cm, 4cm, 5cm and 6 cm.
The working principle of the simulation device for the intermittent earth fault of the power distribution network is as follows: when an intermittent ground fault simulation test is carried out, the high-voltage power supply 1 is adjusted to a proper test voltage, a high-voltage electrode 3 is randomly selected according to actual needs, and the first wiring terminal 31 of the high-voltage electrode is connected with the high-voltage power supply 1. In the process of carrying out the simulation test, if the intermittent fault characteristics are not obvious, the insulation gap is not enough, the high-voltage electrode 3 with larger gap can be selected downwards, the first terminal 31 of the high-voltage electrode is connected with the high-voltage power supply 1, and the simulation test is carried out again. When the critical field strength is reached in the insulating oil gap, intermittent discharges are formed as the sinusoidal voltage amplitude changes and periodically crosses zero.
By way of example, after the simulation device for the intermittent earth fault of the power distribution network is assembled, the test voltage of the high-voltage power supply is set to be 6 kV. Firstly, a high-voltage electrode of 3cm is selected, and a first terminal of the high-voltage electrode is connected with a high-voltage power supply. If the intermittent fault characteristics are not obvious in the test, switching to a high-voltage electrode of 4cm to continue the test. The high voltage electrode spacing is sequentially increased until a significant intermittent ground fault occurs.
Adopt the embodiment of the utility model provides a, through the slope setting of a lateral wall with insulating liquid container 2 to form inconsistent distance difference between two lateral walls of insulating liquid container 2. On this basis, set up a plurality of high voltage electrode 3, arrange according to certain interval on insulating liquid container 2 slope lateral wall high voltage electrode 3, through connecting different high voltage electrode 3 with high voltage power supply 1, can adjust the insulating distance between high voltage electrode 3 and the earth potential electrode 4 to according to the distribution network intermittent type single-phase fault of actual conditions simulation different scenes, can the perfect reproduction intermittent type nature ground fault, improve the authenticity and the comprehensiveness of simulation result, thereby help testing ground fault detection device's performance.
As a preferred embodiment, referring to fig. 2, the simulation device for intermittent ground fault of the power distribution network further comprises a switch 7. The first terminal 31 of the high voltage electrode 3 is connected to the high voltage power supply 1 via the input switch 7.
Adopt the utility model discloses technical means, when developing the fault simulation test, will drop into switch 7 combined floodgate, when need to be changed high voltage electrode and carry out simulation test, will drop into switch 7 disconnection and change again. After the simulation test is finished, the input switch 7 is turned off to prevent personal safety risks.
Preferably, an insulating liquid inlet 21 is arranged above the insulating liquid container 2, and an insulating liquid outlet 22 is arranged below the insulating liquid container.
The embodiment of the utility model provides a distribution network intermittent type nature ground fault's analogue means, including high voltage power supply, insulating liquid container, a plurality of high-voltage electrode, earth potential electrode, simulation transition resistance, insulating liquid and input switch, can select suitable high-voltage electrode to carry out the fault simulation according to the actual fault condition, can effectively simulate distribution network liquid insulation intermittent type nature single-phase ground fault. The simulation device has a simple structure, and the operation process is convenient and safe. Through simulating intermittent fault scene, assist electric power enterprise and detection mechanism to develop the trouble actual measurement, be favorable to testing ground fault detection device's accuracy and reliability.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (8)
1. A simulation device for intermittent earth fault of a power distribution network is characterized by comprising: the device comprises a high-voltage power supply (1), an insulating liquid container (2), a high-voltage electrode (3), a ground potential electrode (4), a simulation transition resistor (5) and insulating liquid (6);
the insulating liquid (6) is contained in the insulating liquid container (2);
the high-voltage electrode (3) is arranged on one side wall of the insulating liquid container (2), the high-voltage electrode (3) is provided with two terminals, and a first terminal (31) is positioned outside the insulating liquid container (2) and used for being connected with the high-voltage power supply (1); the second terminal (32) is positioned inside the insulating liquid container (2) and is in contact with the insulating liquid (6);
the ground potential electrode (4) is arranged on the other side wall of the insulating liquid container (2) and is isolated from the high voltage electrode (3) through the insulating liquid (6);
one end of the analog transition resistor (5) is connected with one end of the ground potential electrode (4), and the other end of the analog transition resistor (5) is grounded.
2. The simulation device of intermittent earth faults in a power distribution network as claimed in claim 1, characterized in that the insulating liquid container (2) is arranged with the side wall of the high voltage electrode (3) in an inclined arrangement.
3. The simulation device for intermittent earth faults in a power distribution network as claimed in claim 2, wherein the high voltage electrodes (3) are plural, and each high voltage electrode (3) is arranged on the obliquely arranged side wall of the insulating liquid container (2) at a preset interval.
4. The simulation device of intermittent earth faults of a power distribution network according to claim 1, characterized in that the simulation device of intermittent earth faults of the power distribution network further comprises a throw switch (7); the first terminal (31) of the high-voltage electrode (3) is connected to the high-voltage power supply (1) via the switch (7).
5. The simulation device for intermittent ground faults of a power distribution network as claimed in claim 1, wherein the second terminal of the high voltage electrode (3) is a rod electrode, a pin electrode or a plate electrode.
6. The simulation device for intermittent earth faults in a power distribution network according to claim 1, characterized in that the earth potential electrode (4) is made of metal.
7. An intermittent earth fault simulation device for an electric distribution network as claimed in claim 1, characterized in that the insulating liquid (6) is distribution transformer insulating oil.
8. An intermittent earth fault simulation device for a power distribution network as claimed in claim 1, characterized in that the insulating liquid container (2) is provided with an insulating liquid inlet (21) above and an insulating liquid outlet (22) below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022562023.5U CN213875994U (en) | 2020-11-09 | 2020-11-09 | Power distribution network intermittent ground fault simulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022562023.5U CN213875994U (en) | 2020-11-09 | 2020-11-09 | Power distribution network intermittent ground fault simulation device |
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| CN213875994U true CN213875994U (en) | 2021-08-03 |
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| CN202022562023.5U Active CN213875994U (en) | 2020-11-09 | 2020-11-09 | Power distribution network intermittent ground fault simulation device |
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- 2020-11-09 CN CN202022562023.5U patent/CN213875994U/en active Active
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