CN212433359U - Power transmission line grounding fault searching instrument - Google Patents
Power transmission line grounding fault searching instrument Download PDFInfo
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- CN212433359U CN212433359U CN202020274777.8U CN202020274777U CN212433359U CN 212433359 U CN212433359 U CN 212433359U CN 202020274777 U CN202020274777 U CN 202020274777U CN 212433359 U CN212433359 U CN 212433359U
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- pilot frequency
- transmission line
- control circuit
- frequency signal
- leakage current
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Abstract
The utility model discloses a transmission line ground fault finder, including casing, operating panel, high-voltage line, earth connection and master control circuit, master control circuit respectively with ground resistance test unit and pilot frequency signal generation unit electrical connection, pilot frequency signal generation unit and isolation amplifier electrical connection are connected with on the isolation amplifier and wait to look for circuit and earth connection, it is equipped with the insulator spindle on the circuit to wait to look for. The utility model adopts program controlled pilot frequency signal to signal source, the frequency is variable, signal with corresponding amplitude is generated according to actual grounding resistance, and leakage current is detected through high precision current sensor on the high voltage insulating rod; positioning by judging whether leakage current exists or not; the instrument adopts a dichotomy, and can be accurately positioned; the improved test signal has higher sensitivity, can generate various variable pilot frequency signals, enables the display to be more visual, and can accurately measure the resistance value of the grounding by adopting the color liquid crystal display, the resistance value is 0-100K omega, and the resolution is 10 omega.
Description
Technical Field
The utility model relates to a transmission line ground fault finder, concretely relates to transmission line ground fault finder that battery maintenance work just can be accomplished to a equipment.
Background
The traditional method for searching the line fault is judged by line solving and table shaking, and the labor intensity is high. The technical measurement sensitivity of the existing instruments on the market is low, the display is not visual, the instruments are all displayed on a monochromatic small screen, and the measurement precision and the resolution are low.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve measurement accuracy and resolution ratio, improve measurement accuracy, the transmission line ground fault tester that the color display screen shows.
For technical purpose above the realization, the utility model provides a transmission line ground fault finder, including casing, operating panel, high-voltage line, earth connection and master control circuit, master control circuit respectively with ground resistance test unit and pilot frequency signal generating element electrical connection, pilot frequency signal generating element and isolation amplifier electrical connection connect ground resistance test unit through waiting to look into circuit and earth connection respectively on the isolation amplifier.
Preferably, a high-voltage insulating rod is arranged on the line to be checked.
Preferably, a current sensor is arranged on the high-voltage insulating rod.
Preferably, the main control circuit is electrically connected with the display screen.
The utility model adopts program controlled pilot frequency signal to signal source, the frequency is variable, signal with corresponding amplitude is generated according to actual grounding resistance, and leakage current is detected through high precision current sensor on the high voltage insulating rod; when the insulation is not good, leakage current is generated from the insulation point, and the leakage current cannot be generated beyond the insulation point. Positioning by judging whether leakage current exists or not; the instrument adopts a dichotomy, and can be accurately positioned; the improved test signal has higher sensitivity, can generate various variable pilot frequency signals, enables the display to be more visual, and can accurately measure the resistance value of the grounding by adopting the color liquid crystal display, the resistance value is 0-100K omega, and the resolution is 10 omega.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic view of the structure flow of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
As shown in fig. 1, for the utility model provides a transmission line ground fault finder, including casing, operating panel, high-voltage line, earth connection and master control circuit, master control circuit respectively with ground resistance test unit and pilot frequency signal generation unit electrical connection, pilot frequency signal generation unit and isolation amplifier electrical connection connect ground resistance test unit through waiting to look into circuit and earth connection respectively on the isolation amplifier.
Furthermore, a high-voltage insulating rod is arranged on the line to be checked; and a current sensor is arranged on the high-voltage insulating rod.
Furthermore, the main control circuit is electrically connected with the display screen, and the resistance value of grounding can be accurately measured by adopting color liquid crystal display, the resistance value is 0-100K omega, and the resolution is 10 omega.
The utility model discloses a theory of operation:
during the use, at first wait to detect the fault line outage, then the utility model discloses a reliable ground connection of earth connection is reliably connected high-voltage line and high-pressure insulator spindle again to touch high-voltage line and the fault line who waits to detect through high-pressure insulator spindle, through the high accuracy current sensor above the high-pressure insulator spindle, detect leakage current and judge to ground resistance test unit. When the insulation point generates leakage current, which indicates that the insulation is not good, the insulation point is positioned by judging whether the leakage current exists or not. The instrument adopts a bisection method, and can be accurately positioned, so that the position of a fault point can be judged.
Use the utility model discloses preceding, operating personnel must handle the power failure procedure according to the flow, and must have at least two people simultaneously at present, and operating personnel still should make self insulation protection rear operable, handles the power transmission procedure according to the procedure after waiting that fault detection finishes again.
The utility model discloses a program control's pilot frequency signal, the frequency is variable, produces the signal of corresponding range according to the ground resistance of reality. And leakage current is detected through a high-precision current sensor on the high-voltage insulating rod. When the insulation is not good, leakage current may occur from the insulated point. Beyond the isolation point, no leakage current can occur. And positioning is carried out by judging whether leakage current exists or not. The instrument adopts a dichotomy and can be accurately positioned.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. The transmission line ground fault finder comprises a shell, an operation panel, a high-voltage wire, a ground wire and a main control circuit, and is characterized in that the main control circuit is electrically connected with a ground resistance testing unit and a pilot frequency signal generating unit respectively, the pilot frequency signal generating unit is electrically connected with an isolation amplifier, and the isolation amplifier is connected with the ground resistance testing unit through a line to be checked and the ground wire respectively.
2. The transmission line ground fault finder of claim 1, wherein a high voltage insulating rod is provided on the line to be found.
3. The transmission line ground fault finder of claim 2, wherein a current sensor is provided on the high voltage insulating rod.
4. The electric transmission line ground fault finder of claim 1, wherein the main control circuit is electrically connected with a display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020274777.8U CN212433359U (en) | 2020-03-09 | 2020-03-09 | Power transmission line grounding fault searching instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020274777.8U CN212433359U (en) | 2020-03-09 | 2020-03-09 | Power transmission line grounding fault searching instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212433359U true CN212433359U (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020274777.8U Active CN212433359U (en) | 2020-03-09 | 2020-03-09 | Power transmission line grounding fault searching instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN212433359U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113625137A (en) * | 2021-08-12 | 2021-11-09 | 大唐普洱新能源有限公司 | Electric line insulation detection and diagnosis device |
-
2020
- 2020-03-09 CN CN202020274777.8U patent/CN212433359U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113625137A (en) * | 2021-08-12 | 2021-11-09 | 大唐普洱新能源有限公司 | Electric line insulation detection and diagnosis device |
| CN113625137B (en) * | 2021-08-12 | 2022-07-26 | 大唐普洱新能源有限公司 | Electric line insulation detection and diagnosis device |
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