CN109991517B - Structure for judging fault point position and test method thereof - Google Patents
Structure for judging fault point position and test method thereof Download PDFInfo
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- CN109991517B CN109991517B CN201910302075.8A CN201910302075A CN109991517B CN 109991517 B CN109991517 B CN 109991517B CN 201910302075 A CN201910302075 A CN 201910302075A CN 109991517 B CN109991517 B CN 109991517B
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- 238000010998 test method Methods 0.000 title claims description 5
- 238000000034 method Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The structure for judging the position of the fault point comprises a busbar N row, wherein N rows of inherent grounding points and unknown grounding points are respectively arranged on the busbar N row, the N rows of inherent grounding points and the unknown grounding points are connected through wires, a loop I and a loop II are formed on the busbar N row, and grounding resistance testers are arranged on the loop I and the loop II. According to the invention, the characteristics of the resistor can be measured under the condition that two points of the pincerlike grounding resistance tester are grounded, one grounding point except the fault point is determined, and then the pincerlike grounding resistance tester is used for determining the position of the fault point.
Description
Technical Field
The invention relates to the technical field of electric technology, in particular to a structure for judging the position of a fault point and a testing method thereof.
Background
The traditional N-row grounding searching method is to separate the load N line from the N rows, and separately perform insulation measurement on the separated N line to confirm whether the N line has grounding phenomenon or not. The method is suitable for the condition of single cables or few cables, but for two sections of emergency buses in a factory, the number is large as much as 400 load N lines, each N line is connected with N rows by bolts, and the disassembly and the connection are troublesome, so that the problem of multipoint grounding of the N rows of the emergency buses is solved, if the method is used for searching, the time and the labor are wasted, and the efficiency is extremely low.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a structure for judging the position of a fault point and a testing method thereof, which can determine a grounding point except the fault point according to the characteristics of a resistor which can be measured under the condition that two points of a clamp-shaped grounding resistance tester are grounded, and then determine the position of the fault point by using the clamp-shaped grounding resistance tester.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The structure for judging the position of the fault point comprises a busbar N row 3, N rows of inherent grounding points 1 and unknown grounding points 2 are respectively arranged on the busbar N row 3, the two grounding points with the N rows of inherent grounding points 1 and the unknown grounding points 2 are connected through a ground wire, a non-fault loop 4 and a fault loop 5 are formed on the busbar N row 3, and a ground resistance tester 6 is arranged on the non-fault loop 4 and the fault loop 5.
The number of the unknown grounding points 2 is at least one.
The non-fault loop 4 can not form a loop through the ground network, and the fault loop 5 can form a loop through the ground network.
The ground resistance tester 6 is a pincerlike ground resistance tester, and the pincerlike ground resistance tester applies voltage to the loop through the exciting coil.
The test method for judging the position of the fault point comprises the following steps of;
Step one:
Determining an auxiliary grounding point except a fault point on the busbar N3;
Step two:
Measuring the resistance of the copper bar or the upstream and downstream of the cable at the auxiliary grounding point by using a clamp-shaped grounding resistance tester;
step three:
if the measured resistance value is smaller, the fault point is positioned at the downstream of the auxiliary grounding point to the clamp meter measuring point;
If the measured resistance exceeds the clamp meter measuring range, indicating that no ground fault exists downstream from the auxiliary ground point to the clamp meter measuring point;
step four:
and taking a point from the auxiliary grounding point to the fault point for testing, and when the resistance value of one point of two adjacent measuring points is smaller and the resistance value of the other point is out of range, indicating that the fault point is between the two measuring points, thereby determining the position of the fault point.
The auxiliary grounding point in the first step is the inherent grounding point of the system or is a grounding point manufactured artificially;
In the third step, if more branches have longer distance spans, a method of firstly measuring N rows of buses at 1/2 of the total number of the branches to be checked and then measuring each branch can be used.
The grounding point is selected at the starting end or the tail end of the N rows.
The invention has the beneficial effects that:
The clamp-on ground resistance tester can only detect the resistance value of the ground loop, if the tested ground does not meet the loop condition, i.e. the tested branch does not form a loop, the ground resistance tester can obtain a result exceeding the upper limit (the tester displays 'OL' or '1500Ω'); if the ground to be tested meets the loop condition, i.e. the branch to be tested forms a loop, the ground resistance tester will obtain a resistance value (the tester shows about "0.1 Ω"). In a point-to-ground system, an unknown ground fault point becomes a demarcation point of whether or not to construct a ground loop: namely, a grounding loop is formed between an unknown grounding fault point and an inherent grounding point of a known system, and the resistance value about 0.1 omega can be measured; the branch circuits outside the unknown ground fault point cannot form a ground loop with the inherent ground point of the system because the branch circuits are not grounded, and the resistance value of 'OL' or '1500 omega' exceeding the upper limit of measurement can be obtained;
The grounding fault point of the loop is detected and determined by using the characteristic that the grounding resistance tester is specially used for detecting the resistance value of the grounding loop. The method is convenient to operate, and the grounding resistance value can be read out from the liquid crystal screen only by winding the jaw of the clamp meter around the tested grounding wire; the measurement is accurate, one big characteristic of the ground resistance tester is that the attached test ring is measured before the test, and if the reading is accurate, the measured ground resistance value is accurate afterwards; unnecessary operations such as disassembling wires and the like are not needed, and the ground resistance value can be obtained only by performing the operation of opening and closing the jaw once without being limited by the surrounding environment. The influence on the cable termination reliability due to the irregular disassembly is avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
FIG. 2is a schematic diagram of the workflow of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1:
The structure for judging the position of the fault point comprises a busbar N row 3, N rows of inherent grounding points 1 and unknown grounding points 2 are respectively arranged on the busbar N row 3, the N rows of inherent grounding points 1 and the unknown grounding points 2 are connected through wires, a non-fault loop 4 and a fault loop 5 are formed on the busbar N row 3, and a ground resistance tester 6 is arranged on the non-fault loop 4 and the fault loop 5.
The ground resistance tester 6 is a pincerlike ground resistance tester, and the pincerlike ground resistance tester applies voltage to the loop through the exciting coil.
As shown in fig. 2:
Step one:
Determining an auxiliary grounding point except a fault point on the busbar N3;
Step two:
Measuring the resistance of the copper bar or the upstream and downstream of the cable at the auxiliary grounding point by using a clamp-shaped grounding resistance tester;
step three:
If the measured resistance value is small (the metallic grounding is usually between a few ohms and tens ohms, as in the case of the 5-loop 2 test in the drawing), then the fault point is indicated to be located downstream from the auxiliary grounding point to the clamp meter measuring point;
If the measured resistance exceeds the clamp meter measuring range (as in the 4-loop 2 test case in the drawing), indicating that no ground fault exists downstream from the auxiliary ground point to the clamp meter measuring point direction;
step four:
and taking a point from the auxiliary grounding point to the fault point for testing, and when the resistance value of one point of two adjacent measuring points is smaller and the resistance value of the other point is out of range, indicating that the fault point is between the two measuring points, thereby determining the position of the fault point.
The auxiliary grounding point in the first step is the inherent grounding point of the system or is a grounding point manufactured artificially;
In the third step, if more branches have longer distance spans, a method of firstly measuring N rows of buses at 1/2 of the total number of the branches to be checked and then measuring each branch can be used.
The grounding point is selected at the starting end or the tail end of the N rows.
Example one:
The two paths of emergency power supply N lines are connected, the field is powered by the two paths of emergency power supply equipment, the N lines of the two paths of emergency power supply are in short circuit in the cabinet, and the whole N rows of the two paths of emergency power supply system are in direct short circuit. Through field inspection, three electric control cabinets have the faults, and the faults are as follows:
1. Electric cabinet 0SAC40GH001 of air conditioning unit in 7.5 meter equipment protection room of electric factory building;
2. electric cabinet 0SAC10GH001 of air conditioning unit of 0m A-row safety distribution room of electric factory building;
3. Electric cabinet 0SAC11GH001 of air conditioning unit of 0m B-row safety distribution room of electric factory building.
Example two: the nuclear island emergency bus and the normal island working bus are respectively used for providing a main power supply and a standby power supply for the power distribution cabinet of the electric door of the normal island, and the two power supply N lines are connected at N rows.
Example three: because the puncture cable is pressed when the street lamp base is installed on the double-fence illumination line, the circuit is in a metallic continuous grounding fault.
The above experiments are internal experiments and are not disclosed.
Claims (4)
1. The test method for judging the position of the fault point is characterized by comprising the following steps of;
Step one:
determining an auxiliary grounding point except for the fault point on the busbar N rows (3);
Step two:
Measuring the resistance of the upper and lower sides of the copper bar at the auxiliary grounding point by using a pincerlike grounding resistance tester;
step three:
If the measured resistance value is smaller, the fault point is positioned at the downstream of the auxiliary grounding point in the measuring point direction of the clamp-shaped grounding resistance tester;
If the measured resistance value exceeds the range of the clamp-shaped grounding resistance tester, indicating that no grounding fault exists downstream from the auxiliary grounding point to the measuring point direction of the clamp-shaped grounding resistance tester;
step four:
and taking a point from the auxiliary grounding point to the fault point for testing, and when the resistance value of one point of two adjacent measuring points is smaller and the resistance value of the other point is out of range, indicating that the fault point is between the two measuring points, thereby determining the position of the fault point.
2. The method according to claim 1, wherein the auxiliary grounding point in the first step is a system inherent grounding point or a grounding point manufactured by man.
3. The method for determining the position of a fault point according to claim 1, wherein in the third step, the more branches have longer distance spans, and a method of measuring N rows of bus bars at 1/2 of the total number of branches to be checked first and then measuring each branch is used.
4. The test method for determining the location of a fault point according to claim 1, wherein the grounding point is selected at a beginning or an end of the N rows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910302075.8A CN109991517B (en) | 2019-04-16 | 2019-04-16 | Structure for judging fault point position and test method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910302075.8A CN109991517B (en) | 2019-04-16 | 2019-04-16 | Structure for judging fault point position and test method thereof |
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| Publication Number | Publication Date |
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| CN109991517A CN109991517A (en) | 2019-07-09 |
| CN109991517B true CN109991517B (en) | 2024-05-03 |
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| CN109991517A (en) | 2019-07-09 |
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