CN112485502A - System and method for determining hoisting electric field intensity threshold of extra-high voltage transformer substation crane - Google Patents
System and method for determining hoisting electric field intensity threshold of extra-high voltage transformer substation crane Download PDFInfo
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The invention belongs to the technical field of high-voltage power transmission, and provides a system and a method for determining a hoisting electric field intensity threshold of an extra-high voltage substation crane. The system for determining the hoisting electric field intensity threshold of the crane of the extra-high voltage transformer substation comprises a through-flow voltage passing device, a voltage level setting device and a control device, wherein the through-flow voltage passing device is connected with primary equipment of the high voltage transformer substation and generates a set voltage level voltage on the primary equipment; the power frequency electric field measuring device is arranged at an electric field intensity measuring point corresponding to a voltage reference point of the equipment with the set voltage level and is used for measuring power frequency electric field intensity corresponding to a plurality of directions around the electric field intensity measuring point; and the processor is used for receiving all power frequency electric field strengths transmitted by the power frequency electric field measuring device at the same electric field strength measuring point, taking the average value, and determining the average value as the power frequency electric field strength threshold value corresponding to the corresponding voltage class equipment.
Description
Technical Field
The invention belongs to the technical field of high-voltage power transmission, and particularly relates to a system and a method for determining a hoisting electric field intensity threshold of an extra-high voltage substation crane.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The capacity of the extra-high voltage power grid is large, the transmission distance is long, the extra-high voltage transformer substation is used as an important node of the extra-high voltage power grid, a large amount of high-altitude operation exists in the working processes of construction, installation, operation, maintenance and overhaul, even live working is needed in rare cases, and in addition, the extra-high voltage transformer substation is large in size, heavy in weight, large in integral construction difficulty and high in safety risk. When the ultrahigh voltage transformer substation is subjected to hoisting operation, the metal suspension arm is close to high-voltage live equipment, air ionization occurs, air becomes a conductor at the moment, current flows to the crane suspension arm from a high-voltage line and then is transmitted to a driver cab and the hoisting equipment, and personal safety of a crane driver and ground personnel is threatened.
The inventor finds that the electric field intensity of a transformer substation which is actually operated is formed by overlapping a plurality of electric potentials, the existing device and method cannot distinguish the voltage levels of all electrified equipment and know the electric field intensity under the safe distance of each voltage level, and finally the alarm threshold value cannot be accurately set in a classified mode.
Disclosure of Invention
In order to solve at least one technical problem in the background art, the invention provides a system and a method for determining a hoisting electric field intensity threshold value of a crane in an ultra-high voltage substation, which can accurately obtain power frequency electric field intensity threshold values corresponding to different voltage levels, thereby ensuring the safety of hoisting work of the crane in the ultra-high voltage substation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a system for determining the hoisting electric field intensity threshold value of an extra-high voltage substation crane, which comprises the following components:
the through-flow voltage-passing device is connected with primary equipment of the high-voltage substation and generates set voltage grade voltage on the primary equipment;
the power frequency electric field measuring device is arranged at an electric field intensity measuring point corresponding to a voltage reference point of the equipment with the set voltage level and is used for measuring power frequency electric field intensity corresponding to a plurality of directions around the electric field intensity measuring point;
and the processor is used for receiving all power frequency electric field strengths transmitted by the power frequency electric field measuring device at the same electric field strength measuring point, taking the average value, and determining the average value as the power frequency electric field strength threshold value corresponding to the corresponding voltage class equipment.
As an embodiment, the through-current and through-voltage device comprises a through-voltage testing module, a through-current testing module and a controller, wherein the through-voltage testing module is used for outputting controllable voltage quantity and phases between the controllable voltage quantity and the controllable current quantity, and the phases between the controllable voltage quantity and the controllable current quantity; the controller is used for controlling the output quantity of the through-voltage testing module and the through-current testing module.
In one embodiment, the power frequency electric field measuring device is arranged on a crane bucket.
As an implementation mode, the power frequency electric field measuring device is communicated with the processor through the optical fiber to wireless transparent transmission module.
In one embodiment, in the ultra-high voltage substation, the equipment voltage reference points include a 1000kV equipment voltage reference point, a 500kV equipment voltage reference point and a 110kV equipment voltage reference point.
As an implementation manner, the selected positions of the voltage reference points of the 1000kV device are as follows: a reactance capacitor PT or a lightning arrester.
As an implementation mode, the selected positions of the voltage reference points of the 500kV device are as follows: a reactance capacitor PT or a lightning arrester.
As an implementation manner, the selected positions of the voltage reference points of the 110kV device are as follows: a reactance capacitor PT or a lightning arrester.
As an embodiment, the electric field strength measurement points are: and a safe distance position matched with the set voltage grade is arranged below the voltage reference point of the set voltage grade equipment.
The invention provides a method for determining a system based on an electric field intensity threshold value of a crane hoisting of an extra-high voltage substation, which comprises the following steps:
selecting a primary equipment loop of the ultra-high voltage substation according to the layout of the ultra-high voltage substation;
selecting voltage reference points of equipment with different voltage grades in the selected primary equipment loop;
selecting electric field intensity measurement points corresponding to the voltage reference points of the equipment with each voltage class;
carrying out voltage-passing and current-passing on primary equipment of a high-voltage transformer substation, and generating a set voltage grade voltage on the primary equipment;
after the primary equipment is electrified, the crane starts to operate, the power frequency electric field measuring device on the bucket is moved to a specified electric field intensity measuring point, and the corresponding power frequency electric field intensity is measured in multiple directions by the power frequency electric field measuring device;
and averaging all power frequency electric field intensities measured at the same electric field intensity measuring point, and determining the average as a power frequency electric field intensity threshold corresponding to the corresponding voltage class equipment.
The invention has the beneficial effects that:
the invention adopts the through-flow voltage-passing device to add actual operating voltage to the primary equipment, actually measures the power frequency electric field intensity corresponding to a plurality of directions around the electric field intensity measuring point through the power frequency electric field measuring device, averages all the power frequency electric field intensities at the same electric field intensity measuring point, and determines the average value as the power frequency electric field intensity threshold value corresponding to the equipment with corresponding voltage class, thus being capable of accurately obtaining the power frequency electric field intensity threshold values corresponding to different voltage classes, and further ensuring the safety of hoisting operation of the crane in the ultra-high voltage transformer substation.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of an electric field intensity threshold value determining system for hoisting of an extra-high voltage substation crane according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a power frequency electric field measurement apparatus according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for determining a hoisting electric field intensity threshold value of an extra-high voltage substation crane according to an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
Referring to fig. 1, the system for determining the hoisting electric field intensity threshold of the crane of the ultra-high voltage substation comprises a through-flow voltage passing device, a power frequency electric field measuring device and a processor.
Specifically, the through-current passing device is connected to a primary device of the high-voltage substation and generates a set voltage class voltage on the primary device.
In some embodiments, the through-current and through-voltage device includes a through-voltage testing module for outputting controllable voltage amounts and phases therebetween, a through-current testing module for outputting controllable voltage amounts and current amounts and phases therebetween, and a controller; the controller is used for controlling the output quantity of the through-voltage testing module and the through-current testing module.
The voltage-passing test module and the current-passing test module are both synchronous with the power supply through a phase-locking synchronization technology. Both the pass-through test module and the pass-through test module are of conventional construction and will not be described in detail here.
The novel power electronic technology of adoption of this embodiment occupies smallly, and light in weight can pass through artifical transport, and can also carry out the through-flow alone or lead to the pressure, still can phase-splitting or three-phase output to can set up volt electric current's amplitude and phase place wantonly, quick, convenient debugging work of developing satisfies the demand of transformer substation's debugging in-process different stages, accomplishes all debugging tasks, supports the transformer substation's start test optimization work.
In this embodiment, the power frequency electric field measuring device is disposed at the electric field strength measuring point corresponding to the voltage reference point of the voltage class setting device, and is configured to measure the power frequency electric field strength corresponding to a plurality of directions (for example, four directions of east, south, west, and north) around the electric field strength measuring point.
In order to ensure safety, the power frequency electric field measuring device is arranged on the crane bucket, and no person is at the crane bucket when the power frequency electric field intensity is measured.
As shown in fig. 2, the power frequency electric field measuring apparatus of this embodiment employs an HI3604 power frequency electromagnetic field measuring instrument, which is placed on a crane bucket, and the power frequency electromagnetic field measuring instrument communicates with a processor through an optical fiber to wireless transparent transmission module (for example, an optical fiber to 4G wireless transparent transmission module).
In this embodiment, the processor is disposed in a host of the on-site monitoring computer, and the on-site monitoring computer accesses the Ineternet server through the mobile network to obtain the HI3604 measured power frequency electric field data.
In the ultra-high voltage transformer substation, the equipment voltage reference points comprise a 1000kV equipment voltage reference point, a 500kV equipment voltage reference point and a 110kV equipment voltage reference point.
The 1000kV equipment voltage reference point is selected as a line PT or an arrester, the position can be approximately considered to be only with a plurality of 1000kV voltage field intensities, the 500kV equipment voltage reference point is selected as the line PT or the arrester, the position is approximately considered to be only with a plurality of 500kV voltage field intensities, the 110kV equipment voltage reference point is selected as a reactance capacitor position PT or the arrester, and the position is approximately considered to be only with a plurality of 110kV voltage field intensities.
After the voltage reference point of the equipment is selected, the electric field intensity measurement points are selected at each voltage level, the height of a 1000kV lightning arrester or PT sleeve is dozens of meters, the height of a 500kV lightning arrester or PT sleeve is dozens of meters, and the height of a 110kV lightning arrester or PT sleeve is dozens of meters, so that the power frequency electric field intensity is measured at a specified safety distance below the sleeve.
In this embodiment, power frequency electric field strength measurement is performed 8.7m below the voltage of the 1000kV lightning arrester.
TABLE 1 different Voltage class safety distance thresholds
In specific implementation, the processor is configured to receive all power frequency electric field strengths transmitted by the power frequency electric field measurement device at the same electric field strength measurement point, take an average value of the power frequency electric field strengths, and determine the average value as a power frequency electric field strength threshold corresponding to the corresponding voltage class device.
Meter 21000 kV line side lightning arrester peripheral power frequency electric field intensity measured value
As shown in Table 2, the power frequency electric field intensity threshold of the 1000kV line side arrester is set to
Referring to fig. 3, the method for determining the system for determining the hoisting electric field strength threshold of the extra-high voltage substation crane based on fig. 1 includes:
step 1: and selecting a primary equipment loop of the ultra-high voltage substation according to the layout of the ultra-high voltage substation.
Step 2: and in the selected primary equipment loop, selecting equipment voltage reference points with different voltage grades.
In the ultra-high voltage transformer substation, the equipment voltage reference points comprise a 1000kV equipment voltage reference point, a 500kV equipment voltage reference point and a 110kV equipment voltage reference point.
The 1000kV equipment voltage reference point is selected as a line PT or an arrester, the position can be approximately considered to be only with a plurality of 1000kV voltage field intensities, the 500kV equipment voltage reference point is selected as the line PT or the arrester, the position is approximately considered to be only with a plurality of 500kV voltage field intensities, the 110kV equipment voltage reference point is selected as a reactance capacitor position PT or the arrester, and the position is approximately considered to be only with a plurality of 110kV voltage field intensities.
And step 3: and selecting an electric field intensity measuring point corresponding to the voltage reference point of each voltage class device.
After the voltage reference point of the equipment is selected, the electric field intensity measurement points are selected at each voltage level, the height of a 1000kV lightning arrester or PT sleeve is dozens of meters, the height of a 500kV lightning arrester or PT sleeve is dozens of meters, and the height of a 110kV lightning arrester or PT sleeve is dozens of meters, so that the power frequency electric field intensity is measured at a specified safety distance below the sleeve.
In this embodiment, power frequency electric field strength measurement is performed 8.7m below the voltage of the 1000kV lightning arrester.
And 4, step 4: and (4) carrying out voltage-passing and current-flowing on primary equipment of the high-voltage substation, and generating set voltage grade voltage on the primary equipment.
And 5: after the primary equipment is electrified, the crane starts to operate, the power frequency electric field measuring device on the bucket is moved to a specified electric field intensity measuring point, and the corresponding power frequency electric field intensity is measured in multiple directions (for example, four directions of east, south, west and north) of the power frequency electric field measuring device.
Step 6: and averaging all power frequency electric field intensities measured at the same electric field intensity measuring point, and determining the average as a power frequency electric field intensity threshold corresponding to the corresponding voltage class equipment.
According to the embodiment, the actual running voltage is added to the primary equipment by the through-flow voltage passing device, the power frequency electric field intensities corresponding to the multiple directions around the electric field intensity measuring point are actually measured by the power frequency electric field measuring device, the average value of all the power frequency electric field intensities at the same electric field intensity measuring point is obtained, the average value is determined as the power frequency electric field intensity threshold value corresponding to the equipment with the corresponding voltage class, so that the power frequency electric field intensity threshold values corresponding to different voltage classes can be accurately obtained, and the safety of hoisting work of the crane in the ultra-high voltage transformer substation is guaranteed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an extra-high voltage substation hoist and mount electric field intensity threshold value confirms system which characterized in that includes:
the through-flow voltage-passing device is connected with primary equipment of the high-voltage substation and generates set voltage grade voltage on the primary equipment;
the power frequency electric field measuring device is arranged at an electric field intensity measuring point corresponding to a voltage reference point of the equipment with the set voltage level and is used for measuring power frequency electric field intensity corresponding to a plurality of directions around the electric field intensity measuring point;
and the processor is used for receiving all power frequency electric field strengths transmitted by the power frequency electric field measuring device at the same electric field strength measuring point, taking the average value, and determining the average value as the power frequency electric field strength threshold value corresponding to the corresponding voltage class equipment.
2. The system for determining the hoisting electric field intensity threshold of the extra-high voltage substation crane according to claim 1, wherein the through-current voltage device comprises a through-voltage testing module, a through-current testing module and a controller, wherein the through-voltage testing module is used for outputting controllable voltage quantities and phases therebetween, and the through-current testing module is used for outputting controllable voltage quantities and current quantities and phases therebetween; the controller is used for controlling the output quantity of the through-voltage testing module and the through-current testing module.
3. The system for determining the hoisting electric field strength threshold value of the extra-high voltage substation crane according to claim 1, wherein the power frequency electric field measuring device is arranged on a crane bucket.
4. The system for determining the hoisting electric field strength threshold of the extra-high voltage substation crane according to claim 1, wherein the power frequency electric field measuring device is in communication with the processor through an optical fiber to wireless transparent transmission module.
5. The system for determining hoisting electric field strength threshold of extra-high voltage substation crane according to claim 1, wherein in the extra-high voltage substation, the equipment voltage reference points include a 1000kV equipment voltage reference point, a 500kV equipment voltage reference point and a 110kV equipment voltage reference point.
6. The system for determining the hoisting electric field intensity threshold of the extra-high voltage substation crane according to claim 5, wherein the 1000kV equipment voltage reference point is selected from the following positions: a reactance capacitor PT or a lightning arrester.
7. The system for determining the hoisting electric field intensity threshold of the extra-high voltage substation crane according to claim 5, wherein the 500kV equipment voltage reference point is selected from the following positions: a reactance capacitor PT or a lightning arrester.
8. The system for determining the hoisting electric field intensity threshold of the extra-high voltage substation crane according to claim 5, wherein the 110kV equipment voltage reference point is selected from the following positions: a reactance capacitor PT or a lightning arrester.
9. The system for determining hoisting electric field intensity threshold of the extra-high voltage substation crane according to claim 1, wherein the electric field intensity measurement points are as follows: and a safe distance position matched with the set voltage grade is arranged below the voltage reference point of the set voltage grade equipment.
10. The method for determining the hoisting electric field strength threshold value determining system of the extra-high voltage substation crane according to any one of claims 1 to 9 is characterized by comprising the following steps:
selecting a primary equipment loop of the ultra-high voltage substation according to the layout of the ultra-high voltage substation;
selecting voltage reference points of equipment with different voltage grades in the selected primary equipment loop;
selecting electric field intensity measurement points corresponding to the voltage reference points of the equipment with each voltage class;
carrying out voltage-passing and current-passing on primary equipment of a high-voltage transformer substation, and generating a set voltage grade voltage on the primary equipment;
after the primary equipment is electrified, the crane starts to operate, the power frequency electric field measuring device on the bucket is moved to a specified electric field intensity measuring point, and the corresponding power frequency electric field intensity is measured in multiple directions by the power frequency electric field measuring device;
and averaging all power frequency electric field intensities measured at the same electric field intensity measuring point, and determining the average as a power frequency electric field intensity threshold corresponding to the corresponding voltage class equipment.
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Cited By (1)
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