CN113433439A - Method and device for measuring insulation characteristic of power transmission line based on quick charging principle - Google Patents
Method and device for measuring insulation characteristic of power transmission line based on quick charging principle Download PDFInfo
- Publication number
- CN113433439A CN113433439A CN202110770032.XA CN202110770032A CN113433439A CN 113433439 A CN113433439 A CN 113433439A CN 202110770032 A CN202110770032 A CN 202110770032A CN 113433439 A CN113433439 A CN 113433439A
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistor
- output end
- transmission line
- charging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 31
- 238000009413 insulation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000026058 directional locomotion Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Abstract
The invention provides a method and a device for measuring the insulation characteristic of a power transmission line based on a quick charge principle, wherein the device comprises a direct-current high-voltage generator, wherein the output end of the direct-current high-voltage generator is connected with a measured line through a high-voltage charge resistor; the first high-voltage microammeter is connected between the output end of the direct-current high-voltage generator and the input end of the high-voltage charging resistor in series; the resistor voltage divider is bridged between the output end of the high-voltage charging resistor and the ground; the vacuum contactor KA is bridged between the output end of the high-voltage charging resistor and the ground and is close to the output side of the device; the electric safety grounding switch KB is bridged between the output end of the high-voltage charging resistor and the ground and is close to the output end of the high-voltage charging resistor; the second high-voltage microammeter is connected between the output end of the high-voltage charging resistor and the tested line in series, and the invention can accurately detect the insulation resistance of the long-distance power transmission line under the complex electromagnetic environment of the line.
Description
Technical Field
The invention relates to the field of insulation characteristic testing of a power transmission line of a power system, in particular to a method and a device for measuring insulation characteristic of the power transmission line based on a quick charging principle.
Background
With the advance of the construction of the alternating current and direct current extra-high voltage power grid with criss-cross national power grid, the electromagnetic coupling path of the power grid becomes complicated. The directional movement charges generated by the corona of the charged extra-high voltage direct current transmission line in operation can greatly strengthen the electrostatic field generated by the wire charges, and a synthetic electric field (also called an ion flow field) is generated under the combined action. When the two ends of the power transmission line for measuring the insulation characteristics are open-circuited and are positioned in a synthetic electric field, charges can be attached to the surface to generate a charging potential to the ground, and the traditional insulation resistance meter has small output current due to large induced voltage and induced current, so that the insulation resistance can not be tested and even the insulation meter can be burnt.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method and a device for measuring the insulation characteristic of a power transmission line based on a quick charging principle.
The technical scheme of the invention is as follows:
a transmission line insulation characteristic measuring device based on a quick charging principle comprises a direct-current high-voltage generator, a first high-voltage microammeter, a high-voltage charging resistor, a resistor divider, a vacuum contactor KA, an electric safety grounding switch KB and a second high-voltage microammeter;
the output end of the direct current high-voltage generator is connected with a tested circuit through a high-voltage charging resistor;
the first high-voltage microammeter is connected between the output end of the direct-current high-voltage generator and the input end of the high-voltage charging resistor in series;
the resistor voltage divider is bridged between the output end of the high-voltage charging resistor and the ground;
the vacuum contactor KA is bridged between the output end of the high-voltage charging resistor and the ground and is close to the output side of the device;
the electric safety grounding switch KB is bridged between the output end of the high-voltage charging resistor and the ground and is close to the output end of the high-voltage charging resistor;
and the second high-voltage microammeter is connected between the output end of the high-voltage charging resistor and the tested circuit in series.
And the resistance voltage divider is also connected with a universal meter.
The resistor voltage divider comprises a first resistor R1 and a second resistor R2 which are connected in series, wherein the resistance value of the first resistor R1 is 300M omega, and the resistance value of the second resistor R2 is 300K omega.
The direct current high voltage generator 1 outputs 60kV of voltage and 30mA of current.
The resistance value of the high-voltage charging resistor 3 is 2 MOmega, and the power is 2000W.
The resistor divider 6 has a measuring range of 100 kV.
A method for measuring the insulation characteristic of a power transmission line based on a quick charging principle comprises the following specific steps:
the method comprises the following steps that firstly, wiring is carried out according to the device, and the vacuum contactor KA and the electric safety grounding switch KB are kept in a grounding state in an initial state;
step two, pulling the electric safety grounding switch KB open when starting to measure;
step three, regulating the voltage of the direct-current high-voltage generator, reading the numerical value of a first high-voltage microammeter, and stopping regulation when the charging current is 30 mA;
pulling the vacuum contactor KA open, measuring the indicating value U of the resistance voltage divider and the indicating value I of the leakage current of the second high-voltage microammeter line, and calculating the insulation resistance;
and step five, after the test is finished, closing the vacuum contactor KA and closing the electric safety grounding switch KB.
Compared with the prior art, the invention has the beneficial effects that: the insulation resistance of an alternating-current and direct-current transmission line is one of important line parameters of the transmission line and is a key parameter for judging whether the line can be put into operation or not. At present, when long-distance alternating current and direct current transmission line parameters are tested, due to the fact that a line corridor is complex in electromagnetic environment, the insulation resistance detection work can not be completed normally by adopting a conventional insulation resistance tester under the action of near line electromagnetic interference, and personal equipment safety risks are even brought. The direct-current high-voltage generator is adopted to quickly charge the power transmission line, the rising rate of the suspension charging voltage of the adjacent parallel electrified direct-current line to the measured power transmission line is exceeded, the voltage U of the power transmission line and the line leakage current I are measured, and the insulation resistance of the long-distance power transmission line under the complex electromagnetic environment of the line is accurately detected.
Drawings
Fig. 1 is a schematic structural diagram of the overall device of the present invention.
FIG. 2 is a schematic diagram of the relationship between charging time and charging voltage according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
as shown in fig. 1, a device for measuring insulation characteristics of a power transmission line based on a rapid charging principle comprises a 60kV/30mA direct current high voltage generator 1, a first high voltage microampere meter 2, a 2M Ω/2000W high voltage charging resistor 3, a 100kV resistor divider 6, a vacuum contactor KA7, an electric safety grounding switch KB8, and a second high voltage microampere meter 4; the output of the 60kV/30mA direct-current high-voltage generator 1 passes through a 2M omega/2000W high-voltage charging resistor 3 and is connected with a tested circuit; the first high-voltage microammeter 2 is connected in series between the output of the 60kV/30mA direct-current high-voltage generator 1 and the input side of the 2M omega/2000W high-voltage charging resistor 3; the 100kV resistor voltage divider 6 is bridged between the output end of the 2M omega/2000W high-voltage charging resistor 3 and the ground; the vacuum contactor KA7 is bridged between the output end of the 2M omega/2000W high-voltage charging resistor 3 and the ground and is close to the output side of the device; the electric safety grounding switch KB8 is bridged between the output end of the 2M omega/2000W high-voltage charging resistor 3 and the ground and is close to the side of the measured line; the second high-voltage microammeter 4 is connected in series between the output side of the 2M omega/2000W high-voltage charging resistor 3 and a tested circuit.
As shown in figure 2 of the drawings, in which,
a method for measuring the insulation characteristic of a power transmission line based on a quick charging principle comprises the following specific steps:
the method comprises the following steps that firstly, wiring is carried out according to the device in fig. 1, and the vacuum contactor KA7 and the electric safety grounding switch KB8 are kept in a grounding state in an initial state;
step two, when the measurement is started, pulling the electric safety grounding switch KB8 open;
step three, regulating the voltage of the direct-current high-voltage generator 1, reading the numerical value of a first high-voltage microammeter 2, and stopping regulation when the charging current is 30 mA;
fourthly, the vacuum contactor KA7 is pulled open, the indicating value U of the resistance voltage divider 6 and the indicating value I of the line leakage current of the second high-voltage microammeter 4 are measured, and the insulation resistance is calculated;
and step five, after the test is finished, closing the vacuum contactor KA7 and closing the electric safety grounding switch KB 8.
The principle of the method of the invention is that the capacitor charging time constant τ R × C, about 3 τ, can fill the capacitor. Taking a transmission line with the length of 120km and the voltage class of 500kV as an example, the capacitance of the line to the ground is about C01uF, line to ground insulation resistance R0If the voltage is more than 1G omega, calculating the suspension charging time of the adjacent parallel charged DC lines to the measured power transmission line by 3 tau1When the charging time of the measured power transmission line is 1 gx 1uF 3000s, the calculating device charges the measured power transmission line for 3 tau2As 20 mx 1uF is 6s, it is known that the charging full time of the adjacent line to the line under measurement is about 3000s, and the charging full time of the device to the line under measurement is about 6 s. The relationship between charging time and charging voltage is shown in fig. 2, and the Δ U value is the reading of the 100kV resistor divider. The leakage current value I of the line is read in a second high-voltage microammeter 4, and the insulation resistance of the line can be calculated
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A transmission line insulation characteristic measuring device based on a quick charging principle is characterized by comprising a direct-current high-voltage generator (1), a first high-voltage microammeter (2), a high-voltage charging resistor (3), a resistor divider (6), a vacuum contactor KA (7), an electric safety grounding switch KB (8) and a second high-voltage microammeter (4);
the output end of the direct current high voltage generator (1) is connected with a tested line through a high voltage charging resistor (3);
the first high-voltage microammeter (2) is connected between the output end of the direct-current high-voltage generator (1) and the input end of the high-voltage charging resistor (3) in series;
the resistor voltage divider (6) is bridged between the output end of the high-voltage charging resistor (3) and the ground;
the vacuum contactor KA (7) is bridged between the output end of the high-voltage charging resistor (3) and the ground and is close to the output side of the device;
the electric safety grounding switch KB (8) is bridged between the output end of the high-voltage charging resistor (3) and the ground and is close to the output end of the high-voltage charging resistor (3);
the second high-voltage microammeter (4) is connected between the output end of the high-voltage charging resistor (3) and a tested circuit in series.
2. The transmission line insulation characteristic measurement device based on the rapid charging principle as claimed in claim 1, characterized in that a multimeter (5) is further connected to the resistor divider (6).
3. The device for measuring the insulation characteristic of the power transmission line based on the quick charging principle as claimed in claim 1, wherein the resistor divider (6) comprises a first resistor (R1) and a second resistor (R2) which are connected in series, the first resistor (R1) has a resistance value of 300M Ω, and the second resistor (R2) has a resistance value of 300K Ω.
4. The device for measuring the insulation characteristic of the power transmission line based on the quick charging principle as claimed in claim 1, wherein the direct current high voltage generator (1) outputs 60kV of voltage and 30mA of current.
5. The device for measuring the insulation characteristic of the power transmission line based on the quick charge principle as claimed in claim 1, wherein the resistance value of the high-voltage charge resistor (3) is 2M Ω, and the power is 2000W.
6. The device for measuring the insulation characteristic of the power transmission line based on the quick charge principle as claimed in claim 1, wherein the range of the resistor divider (6) is 100 kV.
7. A method for measuring the insulation characteristic of a power transmission line based on a quick charging principle is characterized by comprising the following specific steps:
the method of any one of claims 1 to 6, wherein the vacuum contactor KA (7) and the electric safety grounding switch KB (8) are initially grounded;
step two, when the measurement is started, pulling the electric safety grounding switch KB (8) open;
step three, regulating the voltage of the direct-current high-voltage generator (1), reading the numerical value of the first high-voltage microammeter (2), and stopping regulation when the charging current is 30 mA;
pulling the vacuum contactor KA (7) open, measuring the indication value U of the resistance voltage divider (6) and the indication value I of the line leakage current of the second high-voltage microammeter (4), and calculating the insulation resistance;
and step five, after the test is finished, closing the vacuum contactor KA (7) and closing the electric safety grounding switch KB (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110770032.XA CN113433439A (en) | 2021-07-07 | 2021-07-07 | Method and device for measuring insulation characteristic of power transmission line based on quick charging principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110770032.XA CN113433439A (en) | 2021-07-07 | 2021-07-07 | Method and device for measuring insulation characteristic of power transmission line based on quick charging principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113433439A true CN113433439A (en) | 2021-09-24 |
Family
ID=77759440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110770032.XA Pending CN113433439A (en) | 2021-07-07 | 2021-07-07 | Method and device for measuring insulation characteristic of power transmission line based on quick charging principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113433439A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184863A (en) * | 2021-12-01 | 2022-03-15 | 国网北京市电力公司 | Distribution line grounding inspection device and method by insulation resistance method |
-
2021
- 2021-07-07 CN CN202110770032.XA patent/CN113433439A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184863A (en) * | 2021-12-01 | 2022-03-15 | 国网北京市电力公司 | Distribution line grounding inspection device and method by insulation resistance method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Stone | A perspective on online partial discharge monitoring for assessment of the condition of rotating machine stator winding insulation | |
| CN106771869A (en) | Long range power cable insulation on-line monitoring method based on current in resistance property partition method | |
| CN103809070A (en) | Method and device for direction grounding fault detection on basis of three-phase current changes | |
| CN105842540A (en) | Method for detecting DC bus insulation resistance | |
| CN106124941A (en) | Reactor turn-to-turn insulation diagnostic method | |
| Miao et al. | Arc-faults detection in PV systems by measuring pink noise with magnetic sensors | |
| Loos et al. | Fault direction method in compensated network using the zero sequence active energy signal | |
| CN113433439A (en) | Method and device for measuring insulation characteristic of power transmission line based on quick charging principle | |
| CN104251978A (en) | Tester for affection of alternating-current crosstalk and voltage fluctuation of direct-current system on relay | |
| CN215340162U (en) | Transmission line insulation characteristic measuring device based on quick charge principle | |
| Leal et al. | Comparison of online techniques for the detection of inter-turn short-circuits in transformers | |
| CN109061309A (en) | A kind of car body insulated measurement circuits and measurement method | |
| Liu et al. | Insulation fault detection circuit for ungrounded DC power supply systems | |
| CN109633357B (en) | Method and device for monitoring grounding insulation of multiple buses in three buses | |
| CN108680795B (en) | Direct current system ground capacitance calculation method based on first-order circuit full response | |
| Shuin et al. | Comparison of electrical variables of transient process for earth-to ground fault location in medium voltage cable networks | |
| Liu | A series arc fault location method for dc distribution system using time lag of parallel capacitor current pulses | |
| CN114527352A (en) | Power distribution network single-phase earth fault detection method based on line asymmetry | |
| Mohammad et al. | Turn-to-turn fault protection for dry-type shunt reactors | |
| Idris et al. | Two-terminal fault detection and location for hybrid transmission circuit | |
| Wang et al. | Noise in DC Systems and the Potential Influence on Arc Detection | |
| Junior et al. | Evaluation of High Impedance Faults in Delta 13.8 kV Distribution Network | |
| Xue et al. | The Influence of Line Impedance on Leakage Current Detection in Low Voltage DC Systems | |
| CN218546874U (en) | Insulation resistance tester based on high voltage generator restraines induced voltage | |
| Li et al. | Simulation Research on Sweep Frequency Impedance Characteristics of Transformer Winding Based on Three-Phase Three-Winding Lumped Parameter Model |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |