CN112666380A - Safety diagnosis system and method for live water washing of transformer substation - Google Patents
Safety diagnosis system and method for live water washing of transformer substation Download PDFInfo
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Abstract
The embodiment of the invention discloses a safety diagnosis system and method for electrified water washing of a transformer substation. The system comprises a secondary voltage collector, three-phase alternating current insulation equipment and an early warning analysis host; one end of the secondary voltage collector is connected to a secondary side cable of a bus voltage transformer of each phase of three-phase alternating current, and the other end of the secondary voltage collector is connected to the early warning analysis host; in the process of washing at least one phase of insulating equipment of three-phase alternating current with charged water, a secondary voltage collector collects voltage signals of the secondary side of a bus voltage transformer of each phase of electricity in the three-phase alternating current; the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary side of the bus voltage transformer of all the phases of the three-phase alternating current, and judges whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold value; if the current value exceeds the preset threshold value, outputting an early warning signal; the diagnosis and early warning on the safety of the human body and equipment in the process of washing with the charged water are realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of live water washing of transformer substations, in particular to a safety diagnosis system and method for live water washing of transformer substations.
Background
The insulator of the substation equipment is often subjected to phenomena such as corona, flashover discharge and the like due to long-term dirt accumulation, and equipment failure and outage are caused in severe cases.
In recent years, the safety of the live water washing operation is severe, and the live water washing operation often has a local arc phenomenon or even equipment ground short circuit to cause a fault, which seriously endangers the safety of the operating personnel, so a diagnosis and early warning system for guaranteeing the personal and equipment safety in the live water washing process is urgently needed.
Disclosure of Invention
The embodiment of the invention provides a safety diagnosis system and a safety diagnosis method for live water washing of a transformer substation, which are used for realizing diagnosis and early warning on personal safety and equipment safety in the live water washing process.
In a first aspect, an embodiment of the present invention provides a safety diagnosis system for transformer substation live water flushing, where the system includes: the system comprises an electrified water washing device, a secondary voltage collector, three-phase alternating current insulation equipment and an early warning analysis host;
one end of the secondary voltage collector is connected to a secondary side cable of a bus voltage transformer of each phase of the three-phase alternating current, and the other end of the secondary voltage collector is connected to the early warning analysis host;
the secondary voltage collector is used for collecting a voltage signal of a secondary side of a bus voltage transformer of each phase of electricity in the three-phase alternating current in the process that the charged water washing device washes the insulation equipment of at least one phase of electricity in the three-phase alternating current through charged water;
the early warning analysis host is used for determining a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary side of the bus voltage transformer of all the phases of the three-phase alternating current and judging whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold value; if the current time exceeds the preset time, outputting an early warning signal.
Optionally, the early warning analysis host is specifically configured to determine a zero sequence voltage triple value of the three-phase alternating current according to a vector sum of voltages at secondary sides of all phase electric bus voltage transformers in the three-phase alternating current.
Optionally, the method further comprises: and the early warning mobile receiving end is used for outputting an acousto-optic early warning signal when the triple value of the zero sequence voltage exceeds the early warning zero sequence electrical threshold value.
Optionally, the charged water flushing device comprises a flushing system and a water gun; the water gun is communicated with the flushing system through a water conduit and is grounded, and the water gun is used for spraying the charged water.
Optionally, the electrical insulation of each phase of the three-phase alternating current comprises a post insulator, the post insulator being connected to ground.
In a second aspect, an embodiment of the present invention further provides a safety diagnosis method for transformer substation live water flushing, where the method is performed by the safety diagnosis system for transformer substation live water flushing according to the first aspect, and the method includes:
the secondary voltage collector collects voltage signals of the secondary side of each phase of the bus voltage transformer in the three-phase alternating current in the process that the charged water washing device washes at least one phase of electric insulation equipment in the three-phase alternating current insulation equipment through charged water;
the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of secondary sides of voltage transformers on buses of all the phases of the three-phase alternating current;
the early warning analysis host machine judges whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold value; if the current time exceeds the preset time, outputting an early warning signal.
Optionally, the determining, by the early warning analysis host, a zero-sequence voltage triple current value of the three-phase alternating current according to the voltage signals of the secondary sides of the voltage transformers on the buses of all the phases of the three-phase alternating current includes:
and the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to the vector sum of the voltages of the secondary sides of the voltage transformers on the buses of all the phase currents in the three-phase alternating current.
Optionally, the secondary voltage collector is in electrified water washing device washes through electrified water the in-process of the at least one looks electric insulating apparatus in the three-phase alternating current, gather the voltage signal of every looks electric busbar voltage transformer secondary side in the three-phase alternating current includes: and collecting a voltage-to-ground signal on a phase line of each phase of the three-phase alternating current.
Optionally, the secondary voltage collector is in electrified water washing device washes through electrified water the in-process of the at least one looks electric insulating apparatus in the three-phase alternating current, gather the voltage signal of every looks electric busbar voltage transformer secondary side in the three-phase alternating current includes: and collecting a ground resistance signal of each phase of electricity in the three-phase alternating current.
Optionally, after the early warning analysis host determines the three times of the zero sequence voltage of the three-phase alternating current according to the voltage signals of the secondary sides of the bus voltage transformers of all the phases of the three-phase alternating current, the early warning analysis host further includes: and storing the voltage signals of the secondary sides of the bus voltage transformers of all phases in the three-phase alternating current and the zero sequence voltage triples according to the transformation ratio of the voltage transformers on the buses of all phases in the alternating current.
In the safety diagnosis system for electrified water washing of the transformer substation provided by the embodiment of the invention, in the process that the electrified water washing device washes at least one phase of electric insulation equipment in three-phase alternating current insulation equipment through electrified water, the secondary voltage collector collects voltage signals of the secondary side of each phase of electric bus voltage transformer in the three-phase alternating current; determining a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary side of the bus voltage transformer of all the phases in the three-phase alternating current through an early warning analysis host, and judging whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold value; therefore, the safety diagnosis system can diagnose the safety of the transformer substation in the process of washing the charged water, namely the safety of the human body and equipment; the early warning analysis host outputs an early warning signal when judging that the triple value of the zero sequence voltage exceeds the early warning zero sequence electrical threshold, namely, the early warning analysis host immediately sends out the early warning signal to remind acting personnel to stop working when diagnosing that potential safety hazards exist in the transformer substation, and personal and equipment safety is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a safety diagnosis system for electrified water flushing of a substation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit structure of a ground resistance of a single-phase electrical device in a three-phase alternating current electrical device according to an embodiment of the present invention;
fig. 3 is a flowchart of a safety diagnosis method for transformer substation live water flushing according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a safety diagnosis system for transformer substation live water flushing provided in an embodiment of the present invention, and as shown in fig. 1, the system includes: the system comprises an electrified water washing device 10, a secondary voltage collector 20, an insulating device 30 of three-phase alternating current and an early warning analysis host 40;
one end of the secondary voltage collector 20 is connected to a secondary side cable 80 of a bus voltage transformer for each phase of three-phase alternating current, and the other end is connected to the early warning analysis host 40;
the secondary voltage collector 20 is used for collecting a voltage signal of a secondary side of a bus voltage transformer of each phase of electricity in the three-phase alternating current in the process that the charged water washing device 10 washes at least one phase of electric insulation equipment 30 in the three-phase alternating current insulation equipment 30 through charged water;
the early warning analysis host 40 is configured to determine a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary sides of the bus voltage transformers of all the phases of the three-phase alternating current, and judge whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold; if the current time exceeds the preset time, outputting an early warning signal.
In the present embodiment, the power system is a power system with a large-current ground at a voltage level of 110kV and above, the power system substation includes three-phase ac equipment for outputting three-phase ac power, each phase of the three-phase ac equipment is respectively packaged by an insulation device 30, only the insulation device 30 of the single-phase ac equipment is schematically illustrated in fig. 1, and each phase of the three-phase ac equipment is packaged by the insulation device 30 and thus the three-phase ac equipment is not illustrated in fig. 1. The air contains certain pollutants, so that the pollutants can be accumulated on the insulation equipment 30 for a long time, and the flashover of the insulation equipment 30 caused by the dirt of the insulation equipment 30 is a common accident of a power system transformer substation. In order to prevent the flashover of the insulation device 30, the insulation device 30 of each phase of the three-phase alternating current equipment can be flushed with the charged water one by the charged water flushing device 10 during the normal operation of the three-phase alternating current equipment, so as to keep the insulation device clean. As exemplarily shown in fig. 1, the charged water rinsing device 10 includes a rinsing system 11 and a water gun 12; water gun 12 passes through water conduit 13 and rinse-system 11 intercommunication, and rinse-system 11 provides continuous charged water for water gun 12 through water conduit 13, and charged water refers to the water that resistivity is not less than 1.5k omega cm, and water gun 12 ground connection, water gun 12 are used for spraying charged water in order to carry out charged water washing to insulating apparatus 30.
Utilize electrified water washing unit 10 to carry out electrified water washing in-process to insulating apparatus 30 one by one, because of insulating apparatus 30's the long-pending dirty degree, insulating apparatus 30 self electrical defect (with water column, when spending etc. interact) or factors such as operating personnel operation nonconformity (operation position, operation distance), very easily lead to insulating apparatus 30 local electric arc appearing, and lead to insulating reduction that appears the different degree of three-phase alternating current equipment to ground, lead to three-phase alternating current equipment to break down promptly, electric arc is hardly in the sunshine sufficient daytime of carrying out the operation by the operating personnel in time discover, electric arc is with serious crisis operating personnel and three-phase alternating current equipment's safety. In view of the above, through research by the inventor, when the power system operates normally, the three-phase voltages of the three-phase alternating-current equipment are balanced, so that the zero-sequence voltage triples of the three-phase alternating-current equipment are very small and close to zero or are kept constant, and when any single-phase electrical equipment in the three-phase alternating-current equipment has a ground fault, the ground insulation of the single-phase electrical equipment will be reduced, and the ground voltage of the corresponding single-phase electrical equipment will also be reduced, so that the three-phase voltages of the three-phase alternating-current equipment are not balanced any more, and the zero-sequence voltage triples of the three-phase alternating-current equipment will have certain jitter.
The inventor researches and discovers that the essence of the reduction of the ground insulation of the single-phase electric device lies in that the ground resistance of the single-phase electric device is reduced, as shown in fig. 2, fig. 2 is a schematic circuit structure diagram of the ground resistance of the single-phase electric device in the three-phase alternating current electric device provided by the embodiment of the invention, and the three-phase electric device includes a single-phase electric device a, a single-phase electric device b and a single-phase electric device c, that is, the more the ground resistance Zg of the single-phase electric device is reduced, the more the ground insulation of the single-phase electric device is reduced, and meanwhile, the larger the change of the ground voltage on the phase line 50 of the single-phase electric device is (generally, the more the ground voltage on the phase line 50 of the single-phase electric device is reduced), the more the three-phase voltage of the three-phase electric device is unbalanced, the larger. Therefore, the inventor researches and discovers that in the process of carrying out live water washing on the insulating equipment 30 by an operator, whether the ground insulation of the single-phase electric equipment is lowered or not can be judged by the early warning analysis host 40 according to the ground resistance signal by collecting the ground resistance signal of the single-phase electric equipment corresponding to the washed insulating equipment 30, if the ground resistance corresponding to the ground resistance signal is reduced, the ground insulation of the single-phase electric equipment is lowered, so that the early warning signal can be output to remind the operator to stop the operation in time, and the personal safety and the equipment safety of the operator can be guaranteed; the three-phase alternating current equipment zero sequence voltage triple value can be determined according to the three-phase voltage-to-ground signal by the early warning analysis host 40 by collecting the voltage-to-ground signal on the phase line 50 of the three-phase alternating current equipment, and whether the three-phase voltage-to-ground signal of the three-phase alternating current equipment shakes or not and the shaking amplitude are judged, if the three-phase voltage-to-ground signal corresponding to the three-phase voltage-to-ground signal increases, the ground insulation of the three-phase alternating current equipment is reduced, namely the insulation of the single-phase electric equipment corresponding to the washed insulation equipment 30 is reduced, so that an early warning signal can be output to remind an operator to stop working in time, and personal and equipment safety of.
The above conclusions are explained again based on theoretical knowledge: u of power system in normal operationA、UB、UCThe three-phase voltages are balanced. When the ground insulation of the single-phase electric equipment is reduced, a group of asymmetrical A, B, C three-phase quantities can be transformed and decomposed into three groups of respectively symmetrical three-phase quantities, namely positive sequence (U)1) Negative sequence (U)2) Zero sequence voltage (U)0) The transformation relationship is as follows:
assuming a ground resistance Zg,
Are the respective short-circuit currents of the three-phase electric devices,
for the voltage at the short-circuit point, according to the boundary conditions:
the symmetric component method gives:
namely, it is
Therefore, when the ground resistance Zg is smaller, the ground insulation is reduced more, and the zero sequence voltage value is the same
The larger.
Further, the inventors have studied and found that, since there is a small electrical distance between the phase line 50 side of the in-station three-phase alternating-current electric device and the bus 60 of the in-station three-phase alternating-current electric device, and a change in the voltage to ground on the phase line 50 corresponds to a change in the voltage to ground on the corresponding bus 60, that is, the voltage to ground on the phase line 50 decreases, the voltage to ground on the corresponding bus 60 also decreases, the voltage to ground on the phase line 50 increases, the voltage to ground on the corresponding bus 60 also increases, even if the change in the voltage to ground on the phase line 50 is very close to the change and change value in the voltage to ground on the corresponding bus 60, the zero-sequence voltage triple value corresponding to the voltage to ground on the phase line 50 of the three-phase alternating-current electric device also very close to the zero-sequence voltage triple value corresponding to the voltage to ground on the corresponding bus 60, that is, since there is a small electrical distance between the phase line The change in voltage to ground on bus 60 can represent a change in voltage to ground on the corresponding phase line 50.
Accordingly, in the present embodiment, the secondary voltage collectors 20 are respectively disposed on the secondary side cables 80 of the voltage transformer 90 of the bus 60 of each phase of electricity (i.e., each phase of electrical equipment) in the three-phase alternating current electricity (i.e., each phase of electrical equipment), during the process of electrically washing the insulating equipment 30 of at least one phase of electricity in the insulating equipment 30 of the three-phase alternating current electricity by the electrically-charged water washing device 10, the secondary voltage collectors 20 collect the voltage signals of the secondary sides of the bus voltage transformers of each phase of electricity in the three-phase alternating current electricity, and the voltages of the secondary sides of the bus voltage transformers can reflect the voltages of the bus 60 of each phase of electricity in the three-phase alternating current electricity, so that the early warning analysis host 40 determines the triple value of the zero-sequence voltage of the three-phase alternating current electricity according to the voltage signals of the secondary sides of, if the amplitude exceeds the preset alarm value of the alarm analysis host 40, an early warning signal is output to remind the operating personnel to stop operating in time so as to ensure the personal safety and the equipment safety of the operating personnel.
In order to accurately send out early warning prompt to the operating personnel, an early warning zero sequence electrical threshold value can be further set, wherein the early warning zero sequence electrical threshold value comprises an early warning zero sequence voltage threshold value; when the early warning analysis host 40 judges that the zero sequence voltage is equal to or greater than the early warning zero sequence voltage threshold value, an early warning signal is output.
In addition, one end of the secondary voltage collector 20 is connected to the secondary side cable 80 of the bus voltage transformer for three-phase alternating current, and the other end is connected to the early warning analysis host 40, so that the early warning analysis host 40 can obtain a voltage signal of the secondary side of the bus voltage transformer for three-phase alternating current from the secondary voltage collector; the voltage signal on the secondary side of the bus voltage transformer can be directly converted into a three-phase voltage signal on the bus 60 of three-phase alternating current through the voltage transformer 90. Here, the voltage signal on the in-station phase line 50 and the voltage on the in-station corresponding bus 60 may be regarded as a voltage signal on the primary side of the transformer substation three-phase alternating-current voltage transformer, and the voltage signal on the secondary side of the bus voltage transformer for each phase of the three-phase electricity collected by the secondary voltage collector 20 on the side of the early warning analysis host 40 may be regarded as a voltage signal on the secondary side of the transformer substation voltage transformer.
The zero-sequence voltage of the three-phase alternating current is a value for measuring the balance and symmetry degree of the three-phase voltage of the three-phase alternating current, the three-phase voltage is balanced, three times of the zero-sequence voltage of the three-phase alternating current are very small and close to zero or keep constant, when the three-phase voltage is not balanced any more due to the reduction of the phase voltage of a single-phase voltage or a two-phase voltage caused by the reduction of ground insulation in the three-phase alternating current, the three times of the zero-sequence voltage of the three-phase alternating current (the zero-sequence voltage for the single-phase voltage and the corresponding three times of the zero-sequence voltage for the three-phase alternating current) are.
Optionally, the early warning analysis host 40 is specifically configured to determine a zero sequence voltage triple value of the three-phase alternating current according to a vector sum of voltages at the secondary sides of the bus voltage transformers of all the phases of the three-phase alternating current. Specifically, the three-fold value of the zero-sequence voltage of the three-phase alternating current can be calculated by the early warning analysis host 40 as follows: and (3) solving the vector sum of the voltages of the secondary sides of the bus voltage transformers of all phases of the three-phase alternating current, namely summing the voltage vectors of the secondary sides of the bus voltage transformers of each phase of the three-phase alternating current to obtain the zero-sequence voltage triple value of the three-phase alternating current.
Optionally, the safety diagnosis system that electrified water of transformer substation washed still includes: and the early warning mobile receiving end 70 is used for outputting an acousto-optic early warning signal when the triple value of the zero sequence voltage exceeds the early warning zero sequence electrical threshold value. Specifically, the early warning signal output by the early warning analysis host 40 reminds the operator in the form of an acousto-optic early warning signal through the early warning mobile receiving end 70, and in addition, the early warning mobile receiving end 70 can display the voltage parameters of the secondary side of the bus voltage transformer of all phases in the current three-phase alternating current according to the transformation ratio of the three-phase alternating current bus voltage transformer and display the zero sequence voltage triple value of the current three-phase alternating current, so that the operator can observe and judge the dangerous condition in real time more conveniently.
Alternatively, each phase of the electrical insulation 30 of the three-phase alternating current insulation 30 comprises a post insulator, which is connected to ground. Specifically, referring to fig. 1, each phase of electrical equipment is grounded through the insulation equipment 30, the insulation equipment 30 may be a post insulator, and generally, when the insulation equipment 30 of three-phase electricity is subjected to live water washing, the insulation equipment 30 of each phase of electricity is subjected to live water washing one by one, which belongs to the operation specification. It is of course understood that the insulating device 30 for each phase in the present embodiment is not limited to the post insulator, but may be other insulating devices 30 for each phase besides the post insulator.
The embodiment of the present invention further provides a safety diagnosis method for transformer substation live water flushing, where the method is executed by the safety diagnosis system for transformer substation live water flushing in the above technical solution, and fig. 3 is a flowchart of the safety diagnosis method for transformer substation live water flushing provided by the embodiment of the present invention, and as shown in fig. 3, the method includes:
and S10, the secondary voltage collector collects secondary side voltage signals of each phase of the bus voltage transformer in the three-phase alternating current in the process that the charged water washing device washes at least one phase of the electric insulation equipment in the three-phase alternating current insulation equipment through the charged water.
And S11, the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary sides of the bus voltage transformers of all the phases of the three-phase alternating current.
S12, the early warning analysis host judges whether the triple value of the zero sequence voltage exceeds an early warning zero sequence electrical threshold value; if the current time exceeds the preset time, outputting an early warning signal.
According to the safety diagnosis method for live water washing of the transformer substation, voltage signals of the secondary side of the transformer substation are collected, namely the early warning analysis host 40 collects the voltage signals of the secondary side cable 80 of each phase of bus voltage transformer in three-phase alternating current through the secondary voltage collector 20, the early warning analysis host 40 determines the triple value of the zero sequence voltage of the three-phase alternating current according to the voltage signals of the secondary sides of all the phase of bus voltage transformers in the three-phase alternating current, whether the triple value of the zero sequence voltage shakes and the shaking amplitude is judged, if the shaking amplitude exceeds the early warning zero sequence electrical threshold value, an early warning signal is output to remind operating personnel to stop operating in time, and personal and equipment safety of the operating. The safety diagnosis method for the electrified water washing of the transformer substation provided by the embodiment and the safety diagnosis system for the electrified water washing of the transformer substation in the technical scheme belong to the same invention concept, the same technical effect can be achieved by the safety diagnosis method and the safety diagnosis system, and repeated contents are not repeated here.
Optionally, the determining, by the early warning analysis host, the three zero-sequence voltage triples of the three-phase alternating current according to the voltage signals of the secondary sides of the bus voltage transformers of all the three-phase electricity includes: and the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to the vector sum of the voltages of the secondary sides of the bus voltage transformers of all the phase currents in the three-phase power.
Optionally, the secondary voltage collector collects voltage signals of a secondary side of each phase of the bus voltage transformer in the three-phase alternating current in the process that the charged water washing device washes at least one phase of the three-phase alternating current insulation equipment through the charged water, and the process comprises the following steps: and collecting a voltage-to-ground signal on a phase line of each phase of the three-phase alternating current. Optionally, the secondary voltage collector collects voltage signals of a secondary side of each phase of the bus voltage transformer in the three-phase alternating current in the process that the charged water washing device washes at least one phase of the three-phase electric insulation equipment through the charged water, and the process comprises the following steps: and collecting a ground resistance signal on a phase line of each phase of the three-phase alternating current.
Optionally, after determining the three times of the zero-sequence voltage of the three-phase alternating current according to the voltage signals of the secondary sides of the bus voltage transformers of all the phases of the three-phase alternating current, the early warning analysis host further includes: and storing the voltage signals and the zero sequence voltage triples on the buses of all the phases of electricity in the three-phase alternating current according to the transformation ratio of the bus voltage transformers of all the phases of electricity in the three-phase alternating current. Specifically, the early warning analysis host 40 may further use the collected voltage signals of the secondary sides of the bus voltage transformers of all phases in the three-phase alternating current and the calculated triple value of the zero-sequence voltage, on one hand, the collected voltage signals are beneficial to subsequent workers to extract data for comprehensive analysis, on the other hand, the collected voltage signals can be displayed to the workers through the early warning mobile receiving end, and the workers can judge and early warn according to the displayed data in time.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides a safety diagnostic system that electrified water washed of transformer substation which characterized in that includes: the system comprises an electrified water washing device, a secondary voltage collector, three-phase alternating current insulation equipment and an early warning analysis host;
one end of the secondary voltage collector is connected to a secondary side cable of a bus voltage transformer of each phase of the three-phase alternating current, and the other end of the secondary voltage collector is connected to the early warning analysis host;
the secondary voltage collector is used for collecting a voltage signal of a secondary side of a bus voltage transformer of each phase of electricity in the three-phase alternating current in the process that the electrified water washing device washes at least one phase of electric insulation equipment in the three-phase alternating current insulation equipment through electrified water;
the early warning analysis host is used for determining a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary side of the bus voltage transformer of all the phases of the three-phase alternating current and judging whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold value; if the current time exceeds the preset time, outputting an early warning signal.
2. The safety diagnosis system for transformer substation live water flushing according to claim 1, wherein the early warning analysis host is specifically configured to determine a zero sequence voltage triple value of the three-phase alternating current according to a vector sum of voltages at secondary sides of bus voltage transformers of all phases of electricity in the three-phase alternating current.
3. The safety diagnostic system for substation live water flushing according to claim 1, further comprising:
and the early warning mobile receiving end is used for outputting an acousto-optic early warning signal when the triple value of the zero sequence voltage exceeds the early warning zero sequence electrical threshold value.
4. The safety diagnostic system for substation live water flushing according to claim 1, characterized in that the live water flushing device comprises a flushing system and a water gun;
the water gun is communicated with the flushing system through a water conduit and is grounded, and the water gun is used for spraying the charged water.
5. The safety diagnostic system for substation live water flushing according to claim 1, characterized in that each phase of the three phase alternating current insulation comprises a post insulator, which is grounded.
6. A safety diagnostic method for substation live water flushing, characterized by being performed by the safety diagnostic system for substation live water flushing according to any one of claims 1 to 5, the method comprising:
the secondary voltage collector collects voltage signals of the secondary side of each phase of the bus voltage transformer in the three-phase alternating current in the process that the charged water washing device washes at least one phase of electric insulation equipment in the three-phase alternating current insulation equipment through charged water;
the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to voltage signals of the secondary side of a bus voltage transformer of all the phases of the three-phase alternating current;
the early warning analysis host machine judges whether the zero sequence voltage triple value exceeds an early warning zero sequence electrical threshold value; if the current time exceeds the preset time, outputting an early warning signal.
7. The safety diagnosis method for transformer substation live water flushing according to claim 6, wherein the determining of the three-phase zero-sequence voltage triples of the three-phase alternating current by the early warning analysis host according to the voltage signals of the secondary sides of the bus voltage transformers of all phases of electricity in the three-phase alternating current comprises:
and the early warning analysis host determines a zero sequence voltage triple value of the three-phase alternating current according to the vector sum of the voltages of the secondary sides of the bus voltage transformers of all the phases of the three-phase alternating current.
8. The safety diagnostic method of substation live water flushing according to claim 6,
the secondary voltage collector is in electrified water washing device is washed through electrified water the in-process of the electrical insulating apparatus of an at least looks in the three-phase alternating current gathers the voltage signal of every looks electrical busbar voltage transformer secondary side in the three-phase alternating current includes:
and collecting a voltage-to-ground signal on a phase line of each phase of the three-phase alternating current.
9. The safety diagnostic method of substation live water flushing according to claim 6,
the secondary voltage collector is in electrified water washing device is washed through electrified water the in-process of the at least electric insulating apparatus of looks in three-phase alternating current gathers the voltage signal of every looks electric busbar voltage transformer secondary side in the three-phase alternating current includes:
and collecting a ground resistance signal of each phase of electricity in the three-phase alternating current.
10. The safety diagnosis method for transformer substation live water flushing according to claim 6, wherein the determining, by the early warning analysis host, the three-phase alternating current zero-sequence voltage triple value according to the voltage signal of the secondary side of the bus voltage transformer for all phases of electricity in the three-phase alternating current further comprises:
and storing the voltage signals of the secondary sides of the bus voltage transformers of all phases in the three-phase alternating current and the triple value of the zero sequence voltage according to the transformation ratio of the bus voltage transformers of all phases in the three-phase alternating current.
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| Publication number | Priority date | Publication date | Assignee | Title |
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