CN209784465U - direct current ground fault analysis system - Google Patents
direct current ground fault analysis system Download PDFInfo
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- CN209784465U CN209784465U CN201920214314.XU CN201920214314U CN209784465U CN 209784465 U CN209784465 U CN 209784465U CN 201920214314 U CN201920214314 U CN 201920214314U CN 209784465 U CN209784465 U CN 209784465U
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- ground fault
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- storage battery
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- 238000001514 detection method Methods 0.000 claims abstract description 46
- 239000000523 sample Substances 0.000 claims abstract description 20
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
the utility model relates to an electric power system transformer overhauls the field, concretely relates to direct current ground fault analytic system. The direct current ground fault analysis system includes: the transformer substation direct current system comprises a storage battery, wherein at least one bus branch is connected to the storage battery; the output end of the signal source module is connected with the detection end of the bus branch and is used for providing a small signal for the bus branch; the input end of the first signal detection probe is connected between the first wiring end and the detection end of the bus branch circuit; the input end of the second signal detection probe is connected between the second wiring end and the detection end of the bus branch circuit; and the input end of the data processing module is respectively connected with the output end of the first signal detection probe and the output end of the second signal detection probe. When the direct current system is grounded, the direct current ground fault analysis system can well search the fault branch.
Description
Technical Field
The utility model relates to an electric power system transformer overhauls the field, concretely relates to direct current ground fault analytic system.
Background
The existing direct current system insulation monitor usually uses a direct current leakage current searching method, when a direct current system generates direct current grounding, the leakage current in each outgoing line is detected to judge which branch circuit specifically generates the direct current grounding, the leakage current is usually very small and is in the magnitude order of milliampere or even microampere, and meanwhile, the electromagnetic environment of a transformer substation is complex and the number of interference sources is large. The accuracy of the monitor is greatly challenged, a fault branch can not be accurately found, and a direct current circuit needs to be manually pulled to find out which path is subjected to direct current grounding.
Disclosure of Invention
In order to solve the not enough of existence among the prior art, the utility model provides a direct current ground fault analytic system, direct current ground fault analytic system when direct current system takes place ground connection, the trouble branch road of seeking that can be fine.
According to the utility model provides a technical scheme, a direct current ground fault analytic system, direct current ground fault analytic system includes:
The transformer substation direct current system comprises a storage battery, and at least one bus branch is connected to the storage battery; the bus branch comprises a first terminal connected with the storage battery, a second terminal connected with a load and a detection end positioned between the first terminal and the second terminal;
The output end of the signal source module is connected with the detection end of the bus branch and is used for providing a small signal for the bus branch;
The input end of the first signal detection probe is connected between the first wiring end and the detection end of the bus branch circuit;
the input end of the second signal detection probe is connected between the second wiring end and the detection end of the bus branch circuit;
And the input end of the data processing module is respectively connected with the output end of the first signal detection probe and the output end of the second signal detection probe.
Furthermore, a direct-current positive bus branch is connected to the positive electrode of the storage battery, and a direct-current negative bus branch is connected to the negative electrode of the storage battery.
Further, the storage battery is also connected with a grounding resistor.
further, the signal source module comprises a capacitor C1 and a signal generating module; one end of the capacitor C1 is connected with the input end of the signal generation module, the output end of the signal generation module is connected with the detection end of the bus branch, and the other end of the capacitor C1 is grounded.
further, the signal generation module can generate 90 ~ 110Hz sine alternating current.
Further, the sea wave expanding liquid crystal display module is connected with the data processing module.
From the foregoing, the utility model provides a direct current ground fault analysis system, compared with the prior art, possesses following advantage: the invention uses the small signal method of the signal source module 6 to search for the signal which can be used as a good supplement when the direct current insulation monitoring device analyzes failure. According to the circuit characteristics when grounding occurs, the signal current flowing to the storage battery 1 and the fault point is analyzed and compared, and the grounding resistance 10 is usually lower when direct current grounding occurs and is one order of magnitude smaller than the resistance of the insulation monitoring grounding point of a direct current system, so that the high sensitivity is realized when a fault branch is judged.
drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an electrical schematic diagram of the present invention.
1. The bus comprises a storage battery, 2 bus branches, 3 first terminals, 4 second terminals, 5 detection terminals, 6 signal source modules, 610 signal generation modules, 7 first signal detection probes, 8 second signal detection probes, 9 data processing modules, 10 ground resistors and 11 liquid crystal display modules.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The terms "inner" and "outer" are used to refer to directions toward and away from, respectively, the geometric center of a particular component.
The utility model provides a direct current ground fault analytic system, as shown in figure 1 and figure 2, direct current ground fault analytic system includes:
The transformer substation direct current system comprises a storage battery 1, wherein at least one bus branch 2 is connected to the storage battery 1, and each bus branch 2 comprises a first wiring terminal 3 connected with the storage battery 1, a second wiring terminal 4 connected with a load and a detection end 5 positioned between the first wiring terminal 3 and the second wiring terminal 4; specifically, a direct-current positive bus branch 2 is connected to the positive electrode of the storage battery 1, a direct-current negative bus branch 2 is connected to the negative electrode of the storage battery 1, the storage battery 1 is further connected with a ground resistor 10, and the impedance of the ground resistor 10 is in the order of kilohms. The voltage of the positive bus branch 2 to the ground is +110V, and the voltage of the negative bus branch 2 to the ground is-110V. And the direct-current positive bus branch 2 and the direct-current negative bus branch 2 of the direct-current system of the transformer substation are connected with a direct-current load circuit after being opened in the air.
The output end of the signal source module 6 is connected with the detection end 5 of each bus branch 2 and is used for providing a small signal for the bus branch 2; the detection end 5 is close to the first terminal 3 of the busbar 2, the first terminal 3 of the busbar 2 is connected with the storage battery 1, and the second terminal 4 of the busbar 2 is used for connecting a load.
The input end of the first signal detection probe 7 is connected between the first terminal 3 and the detection end 5 of the bus branch 2; for collecting the current I1 on the busbar branch 2 flowing from the detection point to the first terminal 3.
The input end of the second signal detection probe 8 is connected between the second terminal 4 and the detection end 5 of the bus branch 2; for collecting the current I2 on the busbar branch 2 flowing from the detection point to the second terminal 4.
The input end of the data processing module 9 is respectively connected with the output end of the first signal detection probe 7 and the output end of the second signal detection probe 8; the first signal detection probe 7 outputs the collected current I1 flowing from the detection point to the first terminal 3 on the bus branch 2 to the data processing module 9, the second signal detection probe 8 inputs the collected current I2 flowing from the detection point to the second terminal 4 on the bus branch 2 to the data processing module 9, and the data processing module 9 obtains and compares the magnitudes of the current I1 and the current I2, so as to judge whether the bus branch 2 has a ground fault.
It should be explained that the data processing module 9 may adopt a single chip microcomputer of the prior art, the model of which is STM32F 7. The signal source module 6 comprises a capacitor C1 and a signal generating module 610; one end of the capacitor C1 is connected to the input end of the signal generation module 610, the output end of the signal generation module 610 is connected to the detection end 5 of the bus branch 2, and the other end of the capacitor C1 is grounded.
the principle of the utility model is that:
when dc grounding occurs in busbar branch 2, the impedance of second terminal 4 of busbar branch 2 is much smaller than the resistance of first terminal 3, and current I2 flowing from the detection point to second terminal 4 on busbar branch 2 will be far greater than current I1 flowing from the detection point to first terminal 3 on busbar branch 2. In the normal branch, I1 was detected to be much smaller than I2. According to the sizes of I1 and I2, the failed bus branch 2 can be judged.
It can be understood that the small signal method search of the signal source module 6 can be used as a good supplement when the direct current insulation monitoring device analyzes failure. According to the circuit characteristics when grounding occurs, the signal current flowing to the storage battery 1 and the fault point is analyzed and compared, and the grounding resistance 10 is usually lower when direct current grounding occurs and is one order of magnitude smaller than the resistance of the insulation monitoring grounding point of a direct current system, so that the high sensitivity is realized when a fault branch is judged.
Those of ordinary skill in the art will understand that: the above description is only for the specific embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A dc ground fault analysis system, comprising:
The transformer substation direct current system comprises a storage battery (1), wherein at least one bus branch (2) is connected to the storage battery (1); the bus branch (2) comprises a first terminal (3) connected with the storage battery (1), a second terminal (4) connected with a load and a detection end (5) positioned between the first terminal (3) and the second terminal (4);
The output end of the signal source module (6) is connected with the detection end (5) of the bus branch (2);
the input end of the first signal detection probe (7) is connected between the first wiring end (3) and the detection end (5) of the bus branch (2);
The input end of the second signal detection probe (8) is connected between the second wiring end (4) and the detection end (5) of the bus branch (2);
The input end of the data processing module (9) is respectively connected with the output end of the first signal detection probe (7) and the output end of the second signal detection probe (8).
2. the dc ground fault analysis system according to claim 1, wherein a dc positive bus branch (2) is connected to the positive electrode of the storage battery (1), and a dc negative bus branch (2) is connected to the negative electrode of the storage battery (1).
3. The direct-current ground fault analysis system according to claim 1, characterized in that the accumulator (1) is also connected with a ground resistance (10).
4. The direct current ground fault analysis system of claim 1, wherein the signal source module (6) comprises a capacitor C1 and a signal generation module (610); one end of the capacitor C1 is connected with the input end of the signal generation module (610), the output end of the signal generation module (610) is connected with the detection end (5) of the bus branch (2), and the other end of the capacitor C1 is grounded.
5. the direct current ground fault analysis system of claim 4, wherein the signal generation module (610) is capable of generating 90-110 Hz sinusoidal alternating current.
6. The direct current ground fault analysis system of claim 1, characterized by a sea wave expansion liquid crystal display module (11), said liquid crystal display module (11) being connected to said data processing module (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920214314.XU CN209784465U (en) | 2019-02-19 | 2019-02-19 | direct current ground fault analysis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920214314.XU CN209784465U (en) | 2019-02-19 | 2019-02-19 | direct current ground fault analysis system |
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| Publication Number | Publication Date |
|---|---|
| CN209784465U true CN209784465U (en) | 2019-12-13 |
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| CN201920214314.XU Active CN209784465U (en) | 2019-02-19 | 2019-02-19 | direct current ground fault analysis system |
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| Country | Link |
|---|---|
| CN (1) | CN209784465U (en) |
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2019
- 2019-02-19 CN CN201920214314.XU patent/CN209784465U/en active Active
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