CN215340151U - Insulator flashover early warning system based on harmonic resonance monitoring quantity - Google Patents
Insulator flashover early warning system based on harmonic resonance monitoring quantity Download PDFInfo
- Publication number
- CN215340151U CN215340151U CN202120648024.3U CN202120648024U CN215340151U CN 215340151 U CN215340151 U CN 215340151U CN 202120648024 U CN202120648024 U CN 202120648024U CN 215340151 U CN215340151 U CN 215340151U
- Authority
- CN
- China
- Prior art keywords
- early warning
- power
- transmission line
- harmonic
- line
- 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.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 106
- 239000012212 insulator Substances 0.000 title claims abstract description 83
- 230000005540 biological transmission Effects 0.000 claims abstract description 83
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000009422 external insulation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an insulator flashover early warning system based on harmonic resonance monitoring quantity, which comprises a line charging capacitor power online monitoring unit for detecting the charging capacitance value of a power transmission line and a power transmission line harmonic frequency monitoring unit for detecting the harmonic frequency of the power transmission line, wherein the line charging capacitor power online monitoring unit comprises a reactive power acquisition transmitter and a power difference computer. The online monitoring unit for the power of the line charging capacitor and the harmonic frequency monitoring unit of the power transmission line transmit calculated data and collected data to the early warning unit for the flashover critical condition of the insulator, the early warning unit for the flashover critical condition of the insulator analyzes the data, and when the harmonic source frequency in the data, the combined equivalent reactance of the power transmission line and the charging capacitance value meet the harmonic resonance condition, the early warning unit for the flashover critical condition of the insulator transmits early warning information to the monitoring center of the power line, so that the effective monitoring and early warning of the insulation flashover condition in the power grid system are realized.
Description
Technical Field
The utility model relates to the technical field of power grid system safety monitoring, in particular to an insulator flashover early warning system based on harmonic resonance monitoring quantity.
Background
The insulator is an insulating device connected between a charged body and the ground, and plays an important potential isolation role between the overhead transmission line and the ground potential. During the operation of the overhead transmission line, dust, salt and alkali, industrial smoke and dust and other particles in the air or bird droppings are accumulated on the outer surface of the insulator to form a dirt layer. With the rapid development of economy in China, serious environmental pollution is brought at the same time. Generally, an insulator running on line is mostly in an atmospheric environment, a layer of filth is gradually deposited on the surface of the insulator, when the insulator runs in humid weather, the filth attached to the surface of the insulator is dissolved in water under the humid condition, and then a layer of conductive film is formed on the insulating surface, so that the insulating level of the insulator is greatly reduced, leakage current flows along the surface of the insulator, and the size of the flowing current mainly depends on the filth degree and the moisture degree. When the dirt and the damp are serious, the local electric arc can gradually develop and finally penetrates through the two electrodes to form dirt flashover.
The composite insulator flashover has a large influence on an electric power system, frequent accidents are flashover accidents of the composite insulator of the power transmission and transformation equipment under normal operating voltage, the research on the cause and significance of 'unclear flashover' of the composite insulator is significant, the existing emerging insulator pollution flashover early warning method adopts a leakage current online monitoring mode, the early warning mode carries out real-time online monitoring on flashover current one by one according to the characterization quantity of insulator flashover, but the early warning effect of the mode is limited, and the sudden accidents are difficult to be responded in advance only by monitoring the leakage current.
For example, chinese patent CN106093718A, published 2016, 11, 9, a method for warning flashover of an insulator, includes the following steps: (1) acquiring a salinity value of air; (2) determining the salt spray grade according to the salinity value obtained in the step (1); (3) acquiring a salt density value and an ash density value of the surface of the insulator; (4) determining the pollution grade of the insulator according to the salt density value and the ash density value of the surface of the insulator obtained in the step (3); (5) determining a dirt-moisture grade according to the salt spray grade obtained in the step (2) and the dirt grade obtained in the step (4); and (6) when the dirt-moisture level exceeds a preset threshold value, an insulator flashover alarm is sent out. The utility model discloses a provide a dirty wet grade division method based on insulator surface is long-pending dirty with air salt fog degree for evaluate insulator surface is long-pending dirty and ocean salt fog external insulation's influence, and then make clear and definite external insulation configuration condition and antifouling sudden strain of a muscle measure in service behavior according to dirty wet grade. But the method has the problems that the method is difficult to respond to sudden accidents in advance only by monitoring the leakage current, and the early warning effect is limited.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the technical problem of limited early warning effect exists in the online leakage current monitoring mode adopted by the existing insulator flashover early warning method. The insulator flashover early warning system based on the harmonic resonance monitoring amount is capable of effectively monitoring and early warning the insulation flashover.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides an insulator flashover early warning system based on harmonic resonance monitoring volume, is including the line charging capacitance power on-line monitoring unit that is used for detecting transmission line charging capacitance value and the transmission line harmonic frequency monitoring unit that is used for detecting transmission line harmonic frequency, line charging capacitance power on-line monitoring unit with transmission line harmonic frequency monitoring unit all transmits data for insulator flashover critical condition early warning unit, line charging capacitance power on-line monitoring unit includes reactive power acquisition changer and power difference computer. An insulator flashover early warning system based on harmonic resonance monitoring quantity comprises a line charging capacitor power online monitoring unit, a power transmission line harmonic frequency monitoring unit and an insulator flashover critical condition early warning unit, wherein the charging capacitance value of a power transmission line is monitored and calculated through the line charging capacitor power online monitoring unit and the power transmission line harmonic frequency monitoring unit, the harmonic frequency in the power transmission line is measured and collected through the power transmission line harmonic frequency monitoring unit, the calculated data and the collected data are transmitted to the insulator flashover critical condition early warning unit through the line charging capacitor power online monitoring unit and the power transmission line harmonic frequency monitoring unit, the insulator flashover critical condition early warning unit analyzes the data, and when the harmonic source frequency, the combined equivalent reactance of the power transmission line and the charging capacitance value in the data meet the harmonic resonance condition, the insulator flashover critical condition early warning unit sends early warning information to the power line monitoring center, and effective monitoring and early warning of the insulation flashover condition in the power grid system are achieved.
Preferably, the reactive power acquisition transmitters are respectively positioned on two sides of the power transmission line, and the power difference computer receives data information from the reactive power acquisition transmitters. The reactive power acquisition transmitter is respectively positioned at two sides of the power transmission line, namely the head end and the tail end of the power transmission line, input signals of the reactive power acquisition transmitter are from a bus voltage transformer PT and a current transformer CT of the line, and the rain and snow environment monitoring sensor is used for setting rain and snow correction parameters according to the environment condition of the power transmission line.
Preferably, the insulator flashover critical condition early warning unit receives data information from the power difference computer. And the power difference computer calculates the difference value between the reactive power value at the head end of the line and the reactive power value at the tail end of the line to obtain the charging capacitance value of the line and sends the data to the early warning unit.
Preferably, the line charging capacitance power online monitoring unit further comprises a plurality of rain and snow day environment monitoring sensors for detecting environment conditions of different positions of the power transmission line, and the insulator flashover critical condition early warning unit receives information transmitted by each rain and snow day environment monitoring sensor. The rain and snow day environment monitoring sensor is arranged on an iron tower of a line, and transmits data to the early warning unit through wireless communication signals.
Preferably, the harmonic frequency monitoring unit of the power transmission line comprises a harmonic frequency detecting instrument, the harmonic frequency detecting instrument is respectively positioned at the head end of the power transmission line and the tail end of the power transmission line, and the insulator flashover critical condition early warning unit receives information transmitted by the harmonic frequency detecting instrument. The harmonic frequency monitoring unit of the power transmission line consists of harmonic frequency detecting instruments arranged at the head end and the tail end of the line, and the obtained information is sent to the early warning unit by the communication machine terminal.
Preferably, the insulator flashover critical condition early warning unit comprises an embedded computer and a communication terminal, the rain and snow day environment monitoring sensor, the harmonic frequency detection instrument and the power difference computer transmit data to the communication terminal, and the communication terminal transmits data information to the embedded computer. The insulator flashover critical condition early warning unit consists of an embedded computer and a communication terminal, after harmonic frequency is analyzed, the internal reactance of a harmonic source and the reactance of a transformer are calculated, after line reactance values are combined, the line reactance values and the charging power change track of a power transmission line are analyzed, when the overvoltage condition of harmonic resonance preset according to a change curve is reached, an output signal of insulator flashover early warning alarm is carried out, and the early warning signal is transmitted to a power line monitoring center.
Preferably, the rain and snow day environment monitoring sensors are respectively installed on iron towers of the power transmission line. The rain and snow environment monitoring sensors are respectively arranged on different iron towers of the power transmission line, the rain and snow environment monitoring sensors are arranged on the iron towers at the positions, which need to be detected, of the power transmission line, and one rain and snow environment monitoring sensor can also be arranged at intervals of a plurality of iron towers, so that the rain and snow environment monitoring sensors are conveniently arranged and the distribution of the power transmission line is monitored.
The substantial effects of the utility model are as follows: the utility model comprises a line charging capacitance power online monitoring unit, a power transmission line harmonic frequency monitoring unit and an insulator flashover critical condition early warning unit, wherein the charging capacitance value of the power transmission line is monitored and calculated by the line charging capacitance power online monitoring unit and the power transmission line harmonic frequency monitoring unit, the harmonic frequency in the power transmission line is measured and collected by the power transmission line harmonic frequency monitoring unit, the line charging capacitance power online monitoring unit and the power transmission line harmonic frequency monitoring unit transmit the calculated data and the collected data to the insulator flashover critical condition early warning unit, the insulator flashover critical condition early warning unit analyzes the data, and when the harmonic source frequency in the data, the combined equivalent reactance of the power transmission line and the charging capacitance value meet the harmonic resonance condition, the insulator flashover critical condition early warning unit transmits early warning information to a power line monitoring center, the method realizes effective monitoring and early warning of the insulation flashover condition in the power grid system.
Drawings
FIG. 1 is a schematic view of the overall structure of the present embodiment;
FIG. 2 is a schematic structural diagram of the present embodiment;
fig. 3 is a schematic configuration diagram of an anti-flashover risk early warning system according to the present embodiment;
fig. 4 is a schematic structural diagram of a harmonic source interference system according to this embodiment;
fig. 5 is a schematic diagram of an equivalent circuit of the harmonic source of the present embodiment.
Wherein: 1. the device comprises a line charging capacitor power online monitoring unit, a power transmission line harmonic frequency monitoring unit, a 3 insulator flashover critical condition early warning unit, a 4 reactive power acquisition transmitter, a 5 rain and snow day environment monitoring sensor, a 6 power difference computer and a 7 harmonic frequency detecting instrument.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The utility model provides an insulator flashover early warning system based on harmonic resonance monitoring volume, as shown in figure 1, including circuit charging capacitance power on-line monitoring unit 1, transmission line harmonic frequency monitoring unit 2 and insulator flashover critical condition early warning unit 3, circuit charging capacitance power on-line monitoring unit 1 and transmission line harmonic frequency monitoring unit 2 all are connected with transmission line, circuit charging capacitance power on-line monitoring unit 1 is including the reactive power collection changer 4 that is located transmission line both sides respectively, a plurality of rainy and snowy day environmental monitoring sensor 5 and the power difference computer 6 that are used for detecting the different position environmental conditions of transmission line, as shown in figure 2, reactive power collection changer 4 transmits the transmission line data of gathering for power difference computer 6. The reactive power acquisition transmitter 4 is respectively positioned at two sides of the power transmission line, namely the head end and the tail end of the power transmission line, input signals of the reactive power acquisition transmitter 4 are from a bus voltage transformer PT and a current transformer CT of the line, and the rain and snow environment monitoring sensor 5 is used for setting rain and snow correction parameters according to the environment condition of the power transmission line. And the rain and snow day environment monitoring sensors 5 are respectively arranged on iron towers of the power transmission lines. The rain and snow environment monitoring sensors 5 are respectively arranged on different iron towers of the power transmission line, the rain and snow environment monitoring sensors 5 are arranged on the iron towers at the positions, which need to be detected, of the power transmission line, and one rain and snow environment monitoring sensor 5 can also be arranged at intervals of a plurality of iron towers, so that the rain and snow environment monitoring sensors 5 are conveniently arranged and the distribution monitoring of the power transmission line is facilitated. And each rain and snow day environment monitoring sensor 5 wirelessly transmits data to the insulator flashover critical condition early warning unit 3. The rain and snow day environment monitoring sensor 5 is arranged on an iron tower of a line, and transmits data to the early warning unit through wireless communication signals. And the power difference computer 6 transmits the data to the insulator flashover critical condition early warning unit 3. And the power difference computer 6 calculates the difference value between the reactive power value at the head end of the line and the reactive power value at the tail end of the line to obtain the charging capacitance value of the line and sends the data to the early warning unit.
The harmonic frequency monitoring unit 2 of the power transmission line comprises harmonic frequency detecting instruments 7 respectively positioned at the head end and the tail end of the power transmission line, and the harmonic frequency detecting instruments 7 transmit the acquired power transmission line information to the insulator flashover critical condition early warning unit 3. The harmonic frequency monitoring unit 2 of the power transmission line is composed of harmonic frequency detecting instruments 7 arranged at the head end and the tail end of the line, and sends acquired information to the early warning unit through a communication machine terminal.
The insulator flashover critical condition early warning unit 3 receives signals from the line charging capacitor power online monitoring unit 1 and the power transmission line harmonic frequency monitoring unit 2 respectively, the insulator flashover critical condition early warning unit 3 comprises an embedded computer and a communication terminal, and the communication terminal transmits received data from the rain and snow day environment monitoring sensor 5, the harmonic frequency detection instrument 7 and the power difference computer 6 to the embedded computer. The insulator flashover critical condition early warning unit 3 consists of an embedded computer and a communication terminal, after harmonic frequency analysis, the internal reactance of a harmonic source and the reactance of a transformer are calculated, after line reactance values are combined, the line reactance values and the charging power change track of the power transmission line are analyzed, when the overvoltage condition of harmonic resonance preset according to a change curve is reached, an output signal of insulator flashover early warning alarm is carried out, and the early warning signal is transmitted to a power line monitoring center.
The method aims at finding the fault cause of 'unknown cause flashover' of the insulator of the power transmission line, and is a technical problem which is deposited for many years. The utility model analyzes and monitors from the perspective of a harmonic theory of a power system, has the condition that the theory is consistent with the actual occurrence phenomenon, and sets a user D as a 5-11-order higher harmonic source En which has the interference capability of generating 5-order and 7-order harmonics in operation, as shown in figure 3, B2 is the step-down capability of a 10kV terminal user substationThe voltage transformer converts the voltage from 110kV/10kV grade to 110kV line from A to B point, the design length L is 60km, as shown in the system element parameter diagram of FIG. 4, and can be known after converting to FIG. 5 of the equivalent electrical diagram: the harmonic source En forms a closed loop of harmonic voltage to the charging equivalent capacitance C of the transmission line through the voltage reduction transformer B2, and the charging capacitance value of the line can be regarded as an equivalent variable capacitor C to replace the charging equivalent capacitance C due to the generation of corona and the change of dielectric constant of the transmission line caused by rain. In practice, because the frequency range of the user harmonic source has uncertainty, and because the charging capacitor C in the line is a variable value, the requirement is met
In the formula, the L.C impedance is the lowest value, and the series resonance phenomenon occurs. The current in the loop will be very large when series resonance occurs, while at some point U in the line2Voltage value of U2＝IhdXC×. will become very high i.e. characteristic of harmonic overvoltages. When a certain point of this high overvoltage acts on the closest insulator on the line, an insulator flashover occurs. Because harmonic resonance overvoltage is a random phenomenon, the effect of measuring the leakage current of the insulator is not great, and simultaneously, a harmonic source and a charging capacitance value are changed, so that it is difficult to determine which specific point on a line can generate resonance overvoltage in operation, namely, the phenomenon of insulator flashover, which is a real theoretical reason of the phenomenon of insulator 'unknown flashover'.
The method for carrying out system monitoring on the parameters comprises the following steps: firstly, monitoring the change size and process of a charging capacitor C of a circuit; measuring and collecting harmonic frequency in the power transmission line; the early warning unit analyzes and calculates the parameters according to a harmonic resonance relational expression, and when the harmonic source frequency f and the combined equivalent reactance, the capacitive reactance, namely the inductance L and the capacitor C of each point on the circuit meet the harmonic resonance condition, an alarm signal which is possible to generate harmonic resonance is arranged to draw the attention of a circuit management department, and corresponding action is taken to prevent the tripping accident caused by flashover of the insulator.
The longer the length of the transmission line, the lower the amplification frequency of the harmonics generated by the harmonic source, i.e. the lower the resonance frequency. This is because the resonance condition between the line distributed capacitance Cn and the system reactance is satisfied, and the larger the parallel distributed capacitance value is, the lower the harmonic source resonance frequency is, that is, the condition of the harmonic resonance relational expression is satisfied.
The calculation process for harmonic resonance is as follows:
assuming that the transmission line is a 110kV line, the length of the line is 60kM, the type of the conducting wire is LGJ-240mm2, and the capacitance value is 0.904 mu F/110kM, namely C00.0082 mu F/1kM, and the line reactance value is nLThe resistance value R of the line is 0.132 Ω/kM, 0.391 Ω/1 kM. Total capacitance C on the line10.0082 × 60 ═ 0.492 μ f, step-down transformer B2The model SFS7-20000KVA/110kV, the rated capacity 20000KVA, the impedance voltage% high → low, Ud17.5%, reactance value nB278.7 Ω. Setting the voltage value of harmonic as 4% of rated voltage, Uh＝110kV×0.04＝4.4kV。
When the line length is 60kM, the variation parameter k of the capacitance increase in rainy days is calculated to be 2.8,
C1＝0.492×2.8＝1.378μf，
when the harmonic source is a harmonic of 5 th order, f5When the amplitude of 5 times is 4% of the fundamental wave, U is determined to be 250Hz, 5 times5 times (twice)＝0.04×110kV＝4.4KV。
The inductance of the B2 transformer is: xB2When f is 50Hz, L is 0.25H, the internal impedance of the harmonic source is 0.06H, and the total inductance L is10.25+0.06H 0.31H, and 1.3776 μ F for total capacitance C0.492 × 2.8.
Let the harmonic source be 5 th harmonic:
series harmonic frequencies under this condition:
to find
Point voltage value
UB-1＝ⅰ5 times (twice)·Xc，
UB-133.3kA × 462.3 Ω is 15384KV, which is 140 times higher than the rated voltage 110KV, and such a high voltage value tends to immediately breakdown and discharge the insulator at the point. From the above calculation, it is understood that the resonance overvoltage due to the harmonic is one of the main and common causes of the "unknown flashover" of the insulator, and as the line is on a clear day, the resonance frequency oscillates in the direction of higher order waves due to the decrease in the capacitance C, and the oscillation-starting condition is related to the frequency of the harmonic source.
When the harmonic source is set as 7 harmonics, the capacitance is reduced when the weather is clear, and when the correction parameter k in rainy and snowy days is set to be 1.35 times, the charging capacitance C in the line is set2＝0.442×1.35＝0.664
Under the condition of fine weather, if harmonic interference exists in the electric load at the moment, namely, a harmonic source of 7 times exists, a resonance overvoltage situation of 7 times of harmonic waves can be generated, and the generated high voltage value is also a fault accident that insulation flashover can occur.
From the above, since the capacitor on the line is actually an equivalent variable capacitor C in the rainy weather condition, in this case, if the user contains many times of rich harmonic sources, the relationship between the frequency and L, C is determined
It is very likely that when a proper capacitance value exists, the inductor and the frequency of a harmonic source of a user can meet a harmonic resonance condition, so that resonance overvoltage is very easy to occur, and the fault of insulator flashover occurs, which is the true reason for 'unknown flashover' of a large number of insulators.
The embodiment comprises a line charging capacitor power online monitoring unit 1, a power transmission line harmonic frequency monitoring unit 2 and an insulator flashover critical condition early warning unit 3, wherein the charging capacitance value of the power transmission line is monitored and calculated by the line charging capacitor power online monitoring unit 1 and the power transmission line harmonic frequency monitoring unit 2, the harmonic frequency in the power transmission line is measured and collected by the power transmission line harmonic frequency monitoring unit 2, the line charging capacitor power online monitoring unit 1 and the power transmission line harmonic frequency monitoring unit 2 transmit the calculated data and the collected data to the insulator flashover critical condition early warning unit 3, the insulator flashover critical condition early warning unit 3 analyzes the data, and when the harmonic source frequency in the data, the combined equivalent reactance of the power transmission line and the charging capacitance value meet the harmonic resonance condition, the insulator flashover critical condition early warning unit 3 sends early warning information to a power line monitoring center, the method realizes effective monitoring and early warning of the insulation flashover condition in the power grid system.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. The utility model provides an insulator flashover early warning system based on harmonic resonance monitoring volume, its characterized in that, including circuit charging capacitor power on-line monitoring unit (1) that is used for detecting transmission line charging capacitance value and transmission line harmonic frequency monitoring unit (2) that is used for detecting transmission line harmonic frequency, circuit charging capacitor power on-line monitoring unit (1) with transmission line harmonic frequency monitoring unit (2) all transmits data for insulator flashover critical condition early warning unit (3), circuit charging capacitor power on-line monitoring unit (1) includes reactive power collection changer (4) and power difference computer (6).
2. The insulator flashover early warning system based on the harmonic resonance monitoring quantity according to claim 1, characterized in that the reactive power acquisition transmitters (4) are respectively positioned at two sides of the power transmission line, and the power difference computer (6) receives data information from the reactive power acquisition transmitters (4).
3. An insulator flashover warning system based on harmonic resonance monitoring amount according to claim 1 or 2, characterized in that the insulator flashover critical condition warning unit (3) receives data information from the power difference computer (6).
4. The insulator flashover early warning system based on the harmonic resonance monitoring amount according to claim 1 or 2, characterized in that the line charging capacitance power online monitoring unit (1) further comprises a plurality of rain and snow day environment monitoring sensors (5) for detecting environmental conditions of different positions of the power transmission line, and the insulator flashover critical condition early warning unit (3) receives information transmitted by each rain and snow day environment monitoring sensor (5).
5. The insulator flashover early warning system based on the harmonic resonance monitoring amount according to claim 4, characterized in that the power transmission line harmonic frequency monitoring unit (2) comprises a harmonic frequency detection instrument (7), the harmonic frequency detection instrument (7) is respectively positioned at the head end of the power transmission line and the tail end of the power transmission line, and the insulator flashover critical condition early warning unit (3) receives information transmitted by the harmonic frequency detection instrument (7).
6. The insulator flashover early warning system based on the harmonic resonance monitoring amount according to claim 5, characterized in that the insulator flashover critical condition early warning unit (3) comprises an embedded computer and a communication terminal, the rain and snow environment monitoring sensor (5), the harmonic frequency detection instrument (7) and the power difference computer (6) transmit data to the communication terminal, and the communication terminal transmits data information to the embedded computer.
7. The insulator flashover early warning system based on harmonic resonance monitoring amount according to claim 4, characterized in that the rain and snow environment monitoring sensors (5) are respectively installed on iron towers of the power transmission lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120648024.3U CN215340151U (en) | 2021-03-30 | 2021-03-30 | Insulator flashover early warning system based on harmonic resonance monitoring quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120648024.3U CN215340151U (en) | 2021-03-30 | 2021-03-30 | Insulator flashover early warning system based on harmonic resonance monitoring quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215340151U true CN215340151U (en) | 2021-12-28 |
Family
ID=79591889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120648024.3U Active CN215340151U (en) | 2021-03-30 | 2021-03-30 | Insulator flashover early warning system based on harmonic resonance monitoring quantity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215340151U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117368797A (en) * | 2023-11-17 | 2024-01-09 | 国网青海省电力公司海南供电公司 | Composite insulator flashover early warning method based on leakage current and EFS |
-
2021
- 2021-03-30 CN CN202120648024.3U patent/CN215340151U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117368797A (en) * | 2023-11-17 | 2024-01-09 | 国网青海省电力公司海南供电公司 | Composite insulator flashover early warning method based on leakage current and EFS |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113138324B (en) | Insulator flashover early warning system and method based on harmonic resonance monitoring quantity | |
| WO2021109634A1 (en) | Lightning trip rate testing method taking soil resistivity variation into account | |
| CN105116273A (en) | Insulator on-line monitoring system | |
| CN103326468B (en) | A kind of power equipment remote intelligent environmental monitoring alarm device | |
| CN204945307U (en) | A kind of high-voltage transmission line insulator flashover monitoring system based on 4G communication | |
| CN101592691A (en) | Transmission line thunderbolt, counterattack arbiter | |
| CN104422480A (en) | Power transmission line online monitoring circuit and intelligent insulator suspension ring | |
| CN215340151U (en) | Insulator flashover early warning system based on harmonic resonance monitoring quantity | |
| CN115542073A (en) | High tension transmission line abnormity alarm system | |
| JP3935301B2 (en) | Eggplant contamination detection device and insulator contamination detection system | |
| CN103592580A (en) | Insulator haze and pollution flashover online monitoring system and method | |
| CN106526288A (en) | Transmission line voltage and current monitoring system and method | |
| CN106526383A (en) | Lightning arrester state monitoring system and lightning arrester state monitoring method | |
| CN113495201A (en) | Distributed power transmission cable fault positioning diagnosis system and positioning diagnosis method | |
| CN202025054U (en) | Portable creepage current electrified detecting system for support insulator | |
| CN108535546A (en) | Insulator surface monitored conductivity system and method | |
| CN106771521A (en) | A kind of substation equipment overvoltage aggregation of data acquisition system and method | |
| CN207636665U (en) | A kind of Leakage Current harvester | |
| CN206945795U (en) | A kind of transmission line of electricity voltage x current monitoring system | |
| CN113109633A (en) | Power transmission line lightning stroke monitoring method and system based on distributed traveling wave positioning technology | |
| CN105353236A (en) | On-line remote detection method and device for detecting state of disc-type insulator | |
| CN109631987A (en) | A kind of multi-parameter integrated monitoring and warning system of cable | |
| CN108896870A (en) | Fault recognition method for electric transmission line under power frequency and combined impulse effect | |
| WO2021109632A1 (en) | Method for evaluating shielding failure trip-out rate of 110 kv electricity transmission line | |
| CN208156084U (en) | Insulator surface electrical conductivity monitoring device and power transmission line monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |