CN117148230B - State monitoring system and method for contact assembly of transformer substation - Google Patents
State monitoring system and method for contact assembly of transformer substation Download PDFInfo
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- CN117148230B CN117148230B CN202311414259.6A CN202311414259A CN117148230B CN 117148230 B CN117148230 B CN 117148230B CN 202311414259 A CN202311414259 A CN 202311414259A CN 117148230 B CN117148230 B CN 117148230B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 104
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- 238000012545 processing Methods 0.000 claims description 28
- 238000004146 energy storage Methods 0.000 claims description 20
- 230000000087 stabilizing effect Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
- G01R31/69—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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Abstract
The invention relates to the technical field of power system monitoring, in particular to a system and a method for monitoring the state of a contact assembly of a transformer substation. Wherein, the contact assembly state monitoring system of transformer substation includes: the annular elastic piece, the stress sensor and the monitoring module are sleeved on the peripheral wall of the plum blossom contact finger; the stress sensor is connected with the annular elastic piece and is used for monitoring stress of the annular elastic piece along the circumferential direction of the annular elastic piece and generating corresponding stress signals; the monitoring module is connected with the stress sensor and is used for comparing the stress value corresponding to the stress signal sent by the stress sensor according to the first threshold value and the second threshold value respectively to obtain state information of opening and closing of the contact assembly so as to display the state information. The state monitoring system for the contact assembly of the transformer substation provided by the invention can enable a worker to obtain the state information of the contact assembly according to the display model, so that the worker can monitor the state information of opening and closing of the contact assembly conveniently.
Description
Technical Field
The invention belongs to the technical field of power system monitoring, and particularly relates to a system and a method for monitoring the state of a contact assembly of a transformer substation.
Background
The gas-insulated substation, english Gas Insulated Substation, is called GIS for short, is characterized in that equipment elements such as a circuit breaker, a disconnecting switch, a grounding switch, a voltage transformer, a bus and the like are packaged in a metal shell, and SF6 gas with certain pressure is filled as insulation. Because of the structural characteristics, the closed main conductor can be connected with a plurality of contacts due to the longer length or structural arrangement, so that the safety operation of the equipment is directly influenced by the contact quality of the contacts. While devices for monitoring the status of contacts are known in the art, such devices do not facilitate the monitoring of contact status information by personnel.
Therefore, a monitoring system capable of facilitating analysis of contact state information by a worker is in need of research.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
Therefore, the invention provides a system and a method for monitoring the state of the contact assembly of a transformer substation, which are convenient for monitoring the state information of the contact assembly of the transformer substation by workers.
In a first aspect, the contact assembly state monitoring system of the transformer substation of the embodiment of the invention comprises a moving contact and a fixed contact, wherein the fixed contact comprises a contact seat and a plum blossom contact finger sleeved on the contact seat; the contact assembly state monitoring system of the transformer substation comprises:
The annular elastic piece is sleeved on the peripheral wall of the plum blossom contact finger;
the stress sensor is connected with the annular elastic piece and is used for monitoring stress of the annular elastic piece along the circumferential direction of the annular elastic piece and generating corresponding stress signals;
the monitoring module is connected with the stress sensor and is used for comparing the stress value corresponding to the stress signal sent by the stress sensor according to the first threshold value and the second threshold value respectively to obtain opening and closing state information of the contact assembly so as to display the state information; the first threshold value is a stress value of the annular elastic piece which is positioned before the moving contact is inserted into the plum blossom contact finger along the circumferential direction of the annular elastic piece; the second threshold value is a stress value of the annular elastic piece in the circumferential direction of the annular elastic piece when the contact assembly is in a closing state.
Optionally, the monitoring module includes:
the first analysis unit is used for determining the state information as the state information of the movable contact which is not inserted if the stress value corresponding to the stress signal is equal to a first threshold value;
the second analysis unit is used for determining the state information as the state information of the moving contact, which is not closed, if the stress value corresponding to the stress signal is between the first threshold value and the second threshold value;
the third analysis unit is used for determining the state information as the closing state information of the moving contact if the stress value corresponding to the stress signal is equal to the second threshold value;
And the fourth analysis unit is used for determining the state information as bad state information in the moving contact pair if the stress value corresponding to the stress signal is larger than the second threshold value.
Optionally, the monitoring module further comprises:
the first threshold value calculating unit is used for obtaining a stress value of the annular elastic piece along the circumferential direction of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger according to the diameter corresponding to the moving contact before the moving contact is not inserted into the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the annular elastic piece;
the second threshold value calculating unit is used for obtaining the stress value of the annular elastic piece in the closing state of the contact assembly along the circumferential direction of the annular elastic piece according to the outer diameter of the moving contact, the width of the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the moving contact.
Optionally, the system further comprises a shielding cover, the bottom of the shielding cover is connected with the contact base, the shielding cover and the contact base form a placement cavity, the plum blossom contact finger is located in the placement cavity, and the shielding cover is used for shielding the static contact from an electric field outside the shielding cover.
Optionally, the system further comprises a repeater, wherein the repeater is in wireless connection with the stress sensor, and is used for receiving stress signals sent by the stress sensor, amplifying the stress signals and then sending the stress signals to the monitoring module.
Optionally, the stress sensor includes:
the first end and the second end of the strain gauge are connected with the annular elastic piece;
the positive electrode of the energy storage voltage stabilizing module is electrically connected with the first end of the strain gauge, and the negative electrode of the energy storage voltage stabilizing module is electrically connected with the second end of the strain gauge;
the current sensor is connected to a first closed loop formed by the strain gauge and the energy storage voltage stabilizing module and is used for monitoring the current of the first closed loop and generating a corresponding current signal;
the data processing module is electrically connected with the current sensor and is used for processing the current signal sent by the current sensor to obtain a stress signal corresponding to the annular elastic piece and sending the stress signal to the monitoring module.
Optionally, the data processing module includes:
the signal conversion unit is electrically connected with the current sensor and is used for converting a current signal sent by the current sensor into a digital signal;
the data processing unit is electrically connected with the signal conversion unit and is used for calculating the digital signal to obtain a stress signal corresponding to the annular elastic piece;
the signal amplifying unit is electrically connected with the data processing unit and is used for amplifying the stress signal;
the signal transmitting module is electrically connected with the signal amplifying unit and is used for transmitting the stress signal amplified by the signal amplifying unit to the monitoring module.
In a second aspect, a method for monitoring a state of a contact assembly of a substation according to an embodiment of the present invention is applied to a system for monitoring a state of a contact assembly of a substation in the first aspect or each implementation manner thereof; the method for monitoring the state of the contact assembly of the transformer substation comprises the following steps:
the stress sensor monitors the stress of the annular elastic piece along the circumferential direction of the annular elastic piece and generates a corresponding stress signal;
the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly so as to display the state information; the first threshold value is a stress value of the annular elastic piece which is positioned before the moving contact is inserted into the plum blossom contact finger along the circumferential direction of the annular elastic piece; the second threshold value is a stress value of the annular elastic piece in the circumferential direction of the annular elastic piece when the contact assembly is in a closing state.
Optionally, the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly, so as to display the state information, and the method includes:
if the stress value corresponding to the stress signal is equal to a first threshold value, the first analysis unit determines the state information as the state information that the moving contact is not inserted;
If the stress value corresponding to the stress signal is between the first threshold value and the second threshold value, the second analysis unit determines the state information as the state information of the moving contact, which is not closed;
if the stress value corresponding to the stress signal is equal to the second threshold value, the third analysis unit determines the state information as the closing state information of the moving contact;
and if the stress value corresponding to the stress signal is larger than the second threshold value, the fourth analysis unit determines the state information as bad state information in the moving contact pair.
Optionally, the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly, so as to display the state information, and the method further includes:
the first threshold value calculating unit obtains a stress value borne by the annular elastic piece along the circumferential direction of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger according to the diameter corresponding to the moving contact before the moving contact is not inserted into the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the annular elastic piece;
and the second threshold value calculation unit obtains a stress value of the annular elastic piece in the circumferential direction of the contact assembly in a closing state according to the outer diameter of the moving contact, the width of the plum blossom contact finger and the rigidity coefficient of the annular elastic piece in the circumferential direction of the moving contact.
One of the above technical solutions has at least the following advantages or beneficial effects:
according to the state monitoring system for the contact assembly of the transformer substation, the annular elastic piece is sleeved on the peripheral wall of the plum blossom contact finger, stress borne by the annular elastic piece along the circumferential direction of the annular elastic piece is monitored through the stress sensor, finally, the monitoring module receives stress signals sent by the stress sensor, and according to the stress values corresponding to the stress signals sent by the stress sensor and the stress values corresponding to the first threshold and the second threshold, state information of opening and closing of the contact assembly is obtained, so that the state information is displayed, and a worker obtains the state information of the contact assembly according to the display content of the display model, so that the worker can monitor the state information of opening and closing of the contact assembly conveniently.
The method for monitoring the state of the contact assembly of the transformer substation can be realized based on the system for monitoring the state of the contact assembly of the transformer substation, and the control method realized based on the system for monitoring the state of the contact assembly of the transformer substation has corresponding technical effects because the system for monitoring the state of the contact assembly of the transformer substation has the technical effects.
Drawings
Fig. 1 shows a schematic structural diagram of a contact assembly status monitoring system of a substation according to an embodiment of the present invention;
FIG. 2 illustrates a front cross-sectional view of a contact assembly status monitoring system of a substation according to one embodiment of the present invention;
FIG. 3 shows a top view of the contact assembly status monitoring system of the substation of FIG. 2;
FIG. 4 shows a schematic diagram of the connection of the stress sensor and the annular elastic member of FIG. 2;
FIG. 5 shows a force analysis schematic of the annular spring of FIG. 2;
FIG. 6 shows a schematic structural diagram of a stress sensor according to an embodiment of the present invention;
FIG. 7 illustrates a circuit diagram of a stress sensor according to one embodiment of the present invention;
FIG. 8 shows a circuit diagram of a current limiting protection module according to one embodiment of the present invention;
fig. 9 shows a flowchart of a method for monitoring the state of a contact assembly of a substation according to an embodiment of the present invention.
Reference numerals illustrate:
1. the device comprises an annular elastic piece, 2, a stress sensor, 3, a shielding cover, 4, a fastening spring, 5, a plum blossom contact finger, 6, a moving contact, 7, a contact seat, 8, a monitoring module, 9, a transmitting antenna, 10, a receiving antenna, 11, a display screen, 12, a repeater, 13, a conductor, 201, a strain gauge, 202, an energy storage voltage stabilizing module, 203, a current sensor, 204, a signal conversion unit, 205, a data processing unit, 206, a signal amplifying unit, 207, a signal transmitting module, 208, a closed iron core, 209, a coil, 2010, a current limiting inductor, 2011, an electric quantity monitoring and protecting module, 2012, a voltage monitoring unit, 2013, a logic judging unit, 2014 and a switch.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings. References herein to terms such as "upper", "lower", "inner" and "outer" refer to the orientation of fig. 1-3. The position of the shield 3 with respect to the contact base 7 is defined as "up"; the position of the quincuncial contact finger 5 relative to the shield 3 is defined as "inner".
For the contact assembly of the gas-insulated substation, the contacts of the contact assembly are in plum blossom-shaped contact finger structures, namely, 12-24 contact fingers are fastened together through three or four fastening springs to serve as static contacts. Because the stress of the fastening spring is different in the state of opening and closing the contacts, a sensing system for monitoring the stress of the contacts of the gas-insulated substation is not available in the market, and meanwhile, the real-time monitoring of the stress change of the fastening spring corresponding to the fact that the contact assembly of the gas-insulated substation is not closed in place is still blank.
In order to solve at least one of the technical problems in the prior art or related technologies, in order to realize sensing of stress borne by the plum blossom contact finger, the annular elastic piece is sleeved on the peripheral wall of the plum blossom contact finger, stress borne by the annular elastic piece along the circumferential direction of the annular elastic piece is monitored through the stress sensor, finally, state information of opening and closing of the contact assembly is obtained through receiving a stress signal sent by the stress sensor and according to a stress value corresponding to the stress signal sent by the stress sensor, so that the state information is displayed, and a worker monitors the opening and closing state of the contact assembly according to the displayed state information of the contact assembly of a display model.
A contact assembly status monitoring system of a substation according to some embodiments provided by the present invention is described below with reference to the accompanying drawings.
Referring to fig. 1 to 4, in the contact assembly state monitoring system of a transformer substation according to one embodiment of the present invention, a contact assembly includes a moving contact 6 and a fixed contact, and the fixed contact includes a contact base 7 and a quincuncial contact finger 5 sleeved on the contact base 7; the contact assembly state monitoring system of the transformer substation comprises an annular elastic piece 1, a stress sensor 2 and a monitoring module 8, wherein the annular elastic piece 1 is sleeved on the peripheral wall of a plum blossom contact finger 5; the stress sensor 2 is connected with the annular elastic piece 1, and the stress sensor 2 is used for monitoring stress of the annular elastic piece 1 along the circumferential direction of the annular elastic piece and generating corresponding stress signals; the monitoring module 8 is connected with the stress sensor 2, and the monitoring module 8 is used for comparing the stress values corresponding to the stress signals sent by the stress sensor 2 according to the first threshold value and the second threshold value respectively to obtain state information of opening and closing of the contact assembly so as to display the state information; the first threshold value is a stress value of the annular elastic piece 1 along the circumferential direction of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger 5; the second threshold value is a stress value of the annular elastic piece 1 in the circumferential direction of the annular elastic piece when the contact assembly is in a closed state.
Here, the elastic stress to which the annular elastic member 1 is subjected and the elastic stress of the annular fastening spring 4 fitted around the outer side of the ring-shaped contact finger 5 can be regarded as the same. The annular elastic piece 1 can be an annular spring watchband, and after the annular elastic piece 1 is sleeved on the outer peripheral wall of the plum blossom contact finger 5, the central axis of the annular elastic piece 1 and the central axis of the plum blossom contact finger 5 are positioned on the same straight line; the moving contact 6 is connected to the conductor 13.
The contact assembly may be a contact assembly provided on the disconnecting switch, or may be an internal conductor contact of the substation. The plum blossom contact finger 5 comprises a plurality of contact fingers which are distributed in an annular array, and a plurality of annular fastening springs 4 are sleeved on the peripheral wall of the plum blossom contact finger 5. When the movable contact 6 is not inserted into the plum blossom contact finger 5, namely, the contact assembly is in a brake-separating state, the stress on the annular fastening spring 4 is the radial centripetal force for fixing the plum blossom contact finger 5At this time, and->The stress value to which the corresponding annular elastic member 1 is subjected in its circumferential direction is +.>I.e. the first threshold value is +.>. Because, when the moving contact 6 is inserted into the quincuncial contact finger 5, that is, when the contact assembly is in the closing state, the inner diameter of the quincuncial contact finger 5 is smaller than the outer diameter of the moving contact 6, after the moving contact 6 is inserted into the quincuncial contact finger 5, the side wall of the quincuncial contact finger 5 is expanded outwards along with the insertion of the moving contact 6, the annular fastening spring 4 is also expanded outwards along with the side wall of the quincuncial contact finger 5, and the radial centripetal force generated by the annular fastening spring 4 is caused >At this time, the->Is greater than->At the same time, stress corresponding to the stress signal sent by the stress sensor 2The values are: and->The corresponding annular elastic element 1 is subjected to a current stress value in its circumferential direction>After the motion of inserting the moving contact 6 into the plum blossom contact finger 5 is finished, namely after the contact of the contact assembly is closed, if +.>≈/>It can also be appreciated that +.>It is indicated that the moving contact 6 is not inserted into the fixed contact or just contacted, i.e. the closing of the contact assembly is not in place. Furthermore, in the closed state of the contact assembly, the radial centripetal force generated by the annular clamping spring 4 is +.>At this time, and->The stress value to which the corresponding annular elastic member 1 is subjected in its circumferential direction is +.>I.e. the second threshold is +.>If->And determining the closing state information of the moving contact.
Therefore, stress on the annular elastic piece 1 sleeved on the outer peripheral wall of the plum blossom contact finger 5 is monitored through the stress sensor 2, and then the state information of opening and closing of the contact assembly can be obtained through comparison of a stress value corresponding to a stress signal, a stress value on the annular elastic piece 1 before the moving contact is inserted into the plum blossom contact finger 5 along the circumferential direction of the annular elastic piece, and a stress value on the annular elastic piece 1 in a closing state of the contact assembly along the circumferential direction of the annular elastic piece 1.
In addition, the contact assembly state monitoring system of the transformer substation also comprises an alarm module, and when the contact of the contact assembly is in place after closing, if the contact is in place after closing, the alarm module gives an early warning and timely informs a worker to overhaul the contact assembly.
According to the state monitoring system for the contact assembly of the transformer substation, the annular elastic piece 1 is sleeved on the peripheral wall of the plum blossom contact finger 5, stress on the annular elastic piece 1 along the circumferential direction of the annular elastic piece is monitored through the stress sensor 2, finally, the stress signal sent by the stress sensor 2 is received, and the state information of opening and closing of the contact assembly is obtained by the monitoring module 8 according to the stress value corresponding to the stress signal sent by the stress sensor 2 and the comparison of the first threshold value and the second threshold value respectively, so that the state information is displayed, and the state information of the contact assembly is obtained by a worker according to the display of the display model, so that the state information of opening and closing of the contact assembly is monitored by the worker conveniently.
In some possible embodiments, the monitoring module 8 comprises a first analysis unit, a second analysis unit, a third analysis unit and a fourth analysis unit. The first analysis unit is used for determining the state information as the state information of the movable contact which is not inserted if the stress value corresponding to the stress signal is equal to a first threshold value; the second analysis unit is used for determining the state information as the non-closing state information of the moving contact if the stress value corresponding to the stress signal is between the first threshold value and the second threshold value; the third analysis unit is used for determining the state information as the closing state information of the moving contact if the stress value corresponding to the stress signal is equal to a second threshold value; and the fourth analysis unit is used for determining the state information as bad state information in the moving contact pair if the stress value corresponding to the stress signal is larger than the second threshold value.
Here, when the stress value of the annular elastic member 1 monitored by the stress sensor 2 in the circumferential direction thereof isWhen the moving contact is not inserted, the moving contact non-insertion state information is obtained through analysis of the first analysis unit, wherein the moving contact non-insertion state information can comprise the state information that the moving contact is not inserted into the plum blossom contact finger or the contact opening is not in place; when->When the moving contact is in the closed state, the second analysis unit is used for analyzing the moving contact to obtain the information of the moving contact which is not closed, namely the insertion depth of the moving contact is insufficient; when->When the moving contact is in a closed state, the moving contact is in a closed state or an undivided state, wherein the state information of the moving contact comprises the state information of the moving contact and the plum blossom contact finger, and the undivided state information can be the state information of the corresponding moving contact when the contact is in a switching-off operation; when->And then, the bad state information in the moving contact pair can be obtained through analysis by a fourth analysis unit.
Further, the monitoring module 8 further includes a first threshold calculating unit and a second threshold calculating unit. The first threshold value calculating unit is used for obtaining a stress value of the annular elastic piece 1 along the circumferential direction of the plum blossom contact finger 5 before the moving contact 6 is inserted according to the corresponding diameter of the annular elastic piece 1 before the moving contact 6 is not inserted into the plum blossom contact finger 5 and the rigidity coefficient of the annular elastic piece 1 along the circumferential direction; the second threshold value calculating unit is used for obtaining a stress value of the annular elastic piece 1 in the circumferential direction of the annular elastic piece 1 when the contact assembly is in a closing state according to the outer diameter of the moving contact 6, the width of the plum blossom contact finger 5 and the rigidity coefficient of the annular elastic piece 1 in the circumferential direction.
Here, the formula for calculating the stress value of the annular elastic member 1, which is applied to the moving contact 6 along the circumferential direction thereof before the quincuncial contact finger 5 is not inserted, is as follows:here, a->The diameter of the annular elastic piece 1 corresponding to the moving contact 6 before the moving contact 6 is inserted into the plum blossom contact finger 5 is +.>Is the stiffness coefficient of the annular elastic member 1 in the circumferential direction thereof.
The formula for calculating the stress value of the annular elastic piece 1 in the circumferential direction of the annular elastic piece when the contact assembly is in the closing state is as follows:here, a->For the extension of the annular spring 1 in the closed state of the contact assembly +.>For the outer diameter of the moving contact 6 +.>Is the width of plum blossom contact finger 5, +.>Is the stiffness coefficient of the annular elastic member 1 in the circumferential direction thereof.
It should be noted that, referring to fig. 5, before the moving contact 6 is not inserted into the quincuncial contact finger 5, the diameter of the annular elastic member 1 isAfter the moving contact 6 is inserted into the plum blossom contact finger 5, the diameter of the annular elastic piece 1 is +.>At this time, the acting force of the plum blossom contact finger 5 on the annular elastic piece 1 is +.>The reaction force (the centripetal force of the contact finger of the annular elastic piece 1 acting on the plum blossom contact finger 5 is that) Touch index->The length of the annular elastic element 1 before being not sleeved on the plum blossom contact finger 5 is +.>。
As can be seen from the energy balance, The method comprises the steps of carrying out a first treatment on the surface of the In (1) the->The diameter of the annular elastic member 1 is +.>The corresponding annular elastic piece 1 stretches; />For the stiffness coefficient in the circumferential direction of the annular elastic member 1 +.>The acting force of the plum blossom contact finger 5 to the annular elastic piece 1; />Is a differential factor.
By passing through，/>X, dX is brought intoThe following formula is obtained:
wherein->The ring-shaped elastic piece 1 is acted on the centripetal force of the contact finger of the plum blossom contact finger 5, R is the corresponding radius of the ring-shaped elastic piece 1 after the moving contact 6 is inserted into the plum blossom contact finger 5, R1 is the outer radius of the moving contact 6, R0 is the corresponding radius of the ring-shaped elastic piece 1 before the moving contact 6 is not inserted into the plum blossom contact finger 5, and D is the corresponding diameter of the ring-shaped elastic piece 1 after the moving contact 6 is inserted into the plum blossom contact finger 5.
From the following componentsIt can be seen that the centripetal force of the annular elastic member 1 in the radial direction is linear, the radial stiffness coefficient of which is the stiffness coefficient +_ in the circumferential direction of the annular elastic member 1>Is->The stiffness coefficient in the circumferential direction of the annular elastic member 1 can be obtained by a multiple, and thus, by the radial stiffness coefficient +.>。
It follows that the stress of the annular elastic member 1 in the tangential direction of the radius thereof, i.e. the stress value of the annular elastic member 1 in the circumferential direction thereof, is equal toThe method comprises the steps of carrying out a first treatment on the surface of the After the moving contact 6 is inserted into the plum blossom contact finger 5, and the contact assembly is in a closing state, the stress of the annular elastic piece 1 along the radial tangential direction, namely the stress value of the annular elastic piece 1 along the circumferential direction is +. >。
In some possible embodiments, the system further comprises a shielding cover 3, the bottom of the shielding cover 3 is connected with the contact seat 7, the shielding cover 3 and the contact seat 7 form a placement cavity, the plum blossom contact finger is located in the placement cavity, and the shielding cover 3 is used for shielding the static contact from an electric field outside the shielding cover 3.
Here, a through hole is formed in the top of the shielding case 3, and the moving contact 6 is inserted into the plum blossom contact finger after passing through the through hole. The bottom of the shielding case 3 and the contact base 7 are fixed by polytetrafluoroethylene insulating material glue.
According to the embodiment, the quincuncial contact fingers are arranged in the arrangement cavity formed by the shielding cover 3 and the contact base 7, so that the static contact and the electric field outside the shielding cover 3 can be shielded, the influence of the moving contact 6 and the quincuncial contact fingers on the uniformity of the electric field of the main conductor 13 is avoided, and the generation of partial discharge of the main conductor 13 is further avoided.
In still other possible embodiments, the system further includes a repeater 12, where the repeater 12 is wirelessly connected to the stress sensor 2, and the repeater 12 is configured to receive the stress signal sent by the stress sensor 2, amplify the stress signal, and send the amplified stress signal to the monitoring module 8.
As shown in fig. 1, the repeater 12 is provided with a transmitting antenna 9, and the monitoring module 8 includes a receiving antenna 10 and a display screen 11. Here, the repeater 12 receives the stress signal transmitted from the stress sensor 2, amplifies the stress signal, and transmits the amplified stress signal to the monitoring module 8 via the transmitting antenna 9.
In the present embodiment, a repeater 12 wirelessly connected to the stress sensor 2 is provided, and the stress signal generated by the stress sensor 2 can be further amplified by the repeater 12 so as to be received and displayed by the monitoring module 8.
In other possible embodiments, the stress sensor 2 includes a strain gauge 201, an energy storage and voltage stabilizing module 202, a current sensor 203, and a data processing module, where a first end and a second end of the strain gauge 201 are connected to the annular elastic member 1; the positive electrode of the energy storage voltage stabilizing module 202 is electrically connected with the first end of the strain gauge 201, and the negative electrode of the energy storage voltage stabilizing module 202 is electrically connected with the second end of the strain gauge 201; the current sensor 203 is connected to a first closed loop formed by the strain gauge 201 and the energy storage and voltage stabilizing module 202, and the current sensor 203 is used for monitoring the current of the first closed loop and generating a corresponding current signal; the data processing module is electrically connected with the current sensor 203, and is used for processing the current signal sent by the current sensor 203 to obtain a stress signal corresponding to the annular elastic piece 1, and sending the stress signal to the monitoring module 8.
The strain gauge 201 may be a high-precision fiber grating strain gauge. The first and second ends of the strain gage 201 are opposite ends of the strain gage 201.
It should be noted that, referring to fig. 6, the first end and the second end of the strain gauge 201 are respectively connected with the annular elastic member 1, and meanwhile, the first end and the second end of the strain gauge 201 are respectively connected with the positive and negative electrodes of the energy storage voltage stabilizing module 202. When the tensile stress applied to the annular elastic member 1 changes, the resistance of the strain gauge 201 changes, and at this time, the current of the first closed loop also changes. The changed current signal is then transmitted to the data processing module via the current sensor 203 on the first closed loop.
In the process of carrying out data processing on the current signals by the data processing module, the method also comprises the steps of carrying out data correction and denoising processing on the current signals, wherein the current information can be denoised by adopting a mode of 3-sigma denoising and moving median denoising.
In this embodiment, the current sensor 203 monitors the current on the first closed loop formed by the strain gauge 201 and the energy storage and voltage stabilization module 202 and generates a current signal, and the data processing module processes the current signal to obtain a stress signal corresponding to the annular elastic member 1, so as to monitor the stress of the annular elastic member connected with the strain gauge 201.
Further, referring to fig. 7, the data processing module includes a signal conversion unit 204, a data processing unit 205, a signal amplifying unit 206, and a signal transmitting module 207, where the signal conversion unit 204 is electrically connected to the current sensor 203, and the signal conversion unit 204 is configured to convert a current signal sent by the current sensor 203 into a digital signal; the data processing unit 205 is electrically connected with the signal conversion unit 204, and the data processing unit 205 is used for calculating the digital signal to obtain a stress signal corresponding to the annular elastic piece 1; the signal amplifying unit 206 is electrically connected with the data processing unit 205, and the signal amplifying unit 206 is used for amplifying the stress signal; the signal transmitting module 207 is electrically connected to the signal amplifying unit 206, and the signal transmitting module 207 is configured to transmit the stress signal amplified by the signal amplifying unit 206 to the monitoring module 8.
Here, the signal conversion unit 204 can convert the current signal collected by the signal conversion unit 204 from an analog quantity to a digital quantity, and transmit the digital quantity to the data processing unit 205, so that the data processing unit 205 performs calculation processing on the digital signal to obtain a stress signal corresponding to the annular elastic member 1; the processed digital signal is then transferred to the signal transmitting module 207 through the signal amplifying unit 206, so that the digital signal is transmitted in the form of electromagnetic waves. The data processing unit 205 may adopt a DSP model TMS320C 28335; the signal amplifying unit may be an integrated amplifying circuit, and the signal transmitting module 207 may be a spherical transmitting antenna 9.
Further, the stress sensor 2 further includes a closed iron core 208 and a coil 209, wherein the closed iron core 208 is arranged perpendicular to the direction of the magnetic field generated by the contact assembly after the contact assembly is electrified; the coil 209 is wound on the closed core 208, and two ends of the coil 209 are respectively electrically connected with the energy storage voltage stabilizing module 202 to form a second closed loop.
Since a magnetic field concentric with the conductor 13 is generated when a load current is passed through the conductor 13, the magnetic field is generated at the position of the contact assembly even after the contact assembly is energized, and thus the direction of the magnetic field generated after the contact assembly of the closed core 208 is vertically set, the magnetic force lines generated at the position of the contact assembly can be made to pass through the closed core 208, so that alternating magnetic flux is generated at the closed core 208, and a voltage is generated across the circuit. Since the current induced in the coil 209 changes with the load current, in order to obtain a stable voltage source, the current induced in the loop provided with the coil 209 and the closed core 208 is stored by the energy storage and voltage stabilizing module 202, so that the voltage of the whole loop is stabilized at a fixed value, and the signal converting unit 204 can be supplied with power. Here, the energy storage and voltage stabilizing module 202 may be a micro-rechargeable lithium battery.
Further, the second closed loop is further connected with a current-limiting protection module, and the current-limiting protection module is used for current-limiting protection of the second closed loop.
Here, the current limiting protection module may include a power monitoring and protection module 2011 and a current limiting inductor 2010. When the system provided with the contact assembly disclosed by the embodiment is short-circuited, the magnetic field near the contact assembly is suddenly increased instantaneously, and the current in the second closed loop is also suddenly increased instantaneously, so that the current limiting protection module is connected to the second closed loop, the second closed loop can be acted as a current limiting protection circuit, and the second closed loop can be cut off in time when the system is short-circuited, so that the abrupt change of the current of the second closed loop is avoided. Meanwhile, after the charging of the energy storage voltage stabilizing module 202 is completed, the current limiting protection module can also cut off the second closed loop to prevent the overcharge of the energy storage voltage stabilizing module 202.
Accordingly, referring to fig. 8, the current limiting protection module includes a voltage monitoring unit 2012, a logic judging unit 2013, and a switch 2014, where the switch 2014 is used to control on-off of the second closed loop; the voltage monitoring unit 2012 is configured to feed back the voltage value of the energy storage and voltage stabilizing module 202 in real time; the logic determination unit 2013 is configured to compare the voltage value monitored by the voltage monitoring unit 2012 with a rated voltage value to control on/off of the switch 2014.
Here, the voltage value of the energy storage voltage stabilizing module 202 is fed back in real time through the voltage monitoring unit 2012, and the voltage value is fed back to the logic judging unit 2013. For example, when the voltage value u=100%ue (Ue is the rated voltage value) or u++120%ue, the logic determination unit 2013 controls the switch 2014 to be turned off; when the voltage value U is less than or equal to 80% ue, the logic judgment unit 2013 controls the switch 2014 to be closed.
In some possible embodiments, a mounting groove is formed in the peripheral wall of the quincuncial contact finger 5, the mounting groove is disposed near the plug-in port of the quincuncial contact finger 5, and the mounting groove is used for being in fit connection with the annular elastic member 1, so that the annular elastic member 1 is fixed on the quincuncial contact finger 5.
Here, by placing the annular elastic member 1 in the socket of the quincuncial contact finger 5 near the socket of the quincuncial contact finger 5, the annular elastic member 1 deforms with the insertion or extraction of the contact 6 when the moving contact 6 is inserted into or extracted from the socket of the quincuncial contact finger 5, so that the contact component state monitoring system of the transformer substation can accurately monitor the contact component state.
In another embodiment, as shown in fig. 9, the method for monitoring the state of a contact assembly of a substation according to the exemplary embodiment is applied to the contact assembly state monitoring system of a substation in the foregoing embodiment; the method for monitoring the state of the contact assembly of the transformer substation comprises the following steps:
S101, the stress sensor monitors stress of the annular elastic piece along the circumferential direction of the annular elastic piece and generates a corresponding stress signal;
s102, the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly so as to display the state information; the first threshold value is a stress value of the annular elastic piece which is positioned before the moving contact is inserted into the plum blossom contact finger along the circumferential direction of the annular elastic piece; the second threshold value is a stress value of the annular elastic piece in the circumferential direction of the annular elastic piece when the contact assembly is in a closing state.
Further, the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly, so as to display the state information, and the method can include the following steps:
s201, if a stress value corresponding to the stress signal is equal to a first threshold value, the first analysis unit determines the state information as the state information that the movable contact is not inserted;
s202, if a stress value corresponding to the stress signal is between a first threshold value and a second threshold value, the second analysis unit determines the state information as the state information of the moving contact, which is not closed;
S203, if the stress value corresponding to the stress signal is equal to the second threshold value, the third analysis unit determines the state information as the closing state information of the moving contact;
and S204, if the stress value corresponding to the stress signal is larger than the second threshold value, the fourth analysis unit determines the state information as bad state information in the moving contact pair.
Further, the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly, so as to display the state information, and the method further comprises the following steps:
s301, a first threshold value calculation unit obtains a stress value borne by the annular elastic piece along the circumferential direction of the plum blossom contact finger before the moving contact is not inserted according to the corresponding diameter of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the annular elastic piece;
s302, the second threshold value calculation unit obtains a stress value of the annular elastic piece in a closing state of the contact assembly along the circumferential direction of the annular elastic piece according to the outer diameter of the moving contact, the width of the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the moving contact.
Because the method for monitoring the state of the contact assembly of the transformer substation according to the exemplary embodiment is implemented based on the system for monitoring the state of the contact assembly of the transformer substation according to any one of the exemplary embodiments, the method for monitoring the state of the contact assembly of the transformer substation according to any one of the exemplary embodiments has all the advantages of the system for monitoring the state of the contact assembly of the transformer substation according to any one of the exemplary embodiments, and the implementation of the method for controlling the state of the contact assembly of the transformer substation can be implemented with reference to the embodiment of the system for monitoring the state of the contact assembly of the transformer substation, which is not repeated herein.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "example embodiments," "examples," "specific examples," or "some examples," etc., refer to a particular feature, structure, material, or characteristic described in connection with the embodiment or example as being included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.
Claims (8)
1. The contact assembly state monitoring system of the transformer substation is characterized in that the contact assembly comprises a moving contact and a fixed contact, wherein the fixed contact comprises a contact seat and a plum blossom contact finger sleeved on the contact seat; the contact assembly state monitoring system of the transformer substation comprises:
the annular elastic piece is sleeved on the peripheral wall of the plum blossom contact finger;
the stress sensor is connected with the annular elastic piece and is used for monitoring stress of the annular elastic piece along the circumferential direction of the annular elastic piece and generating corresponding stress signals;
the monitoring module is connected with the stress sensor and is used for comparing the stress value corresponding to the stress signal sent by the stress sensor according to a first threshold value and a second threshold value respectively to obtain state information of opening and closing of the contact assembly so as to display the state information; the first threshold value is a stress value of the annular elastic piece along the circumferential direction of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger; the second threshold value is a stress value of the annular elastic piece in the circumferential direction of the annular elastic piece when the contact assembly is in a closing state;
wherein, the monitoring module includes:
the first analysis unit is used for determining the state information as the state information of the moving contact which is not inserted if the stress value corresponding to the stress signal is equal to the first threshold value;
The second analysis unit is used for determining the state information as the state information of the moving contact, which is not closed, if the stress value corresponding to the stress signal is between the first threshold value and the second threshold value;
the third analysis unit is used for determining the state information as the closing state information of the moving contact if the stress value corresponding to the stress signal is equal to the second threshold value;
and the fourth analysis unit is used for determining the state information as bad state information in the moving contact pair if the stress value corresponding to the stress signal is larger than the second threshold value.
2. The contact assembly status monitoring system of a substation of claim 1, wherein the monitoring module further comprises:
the first threshold value calculating unit is used for obtaining a stress value of the annular elastic piece along the circumferential direction of the plum blossom contact finger before the moving contact is not inserted according to the corresponding diameter of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the annular elastic piece;
and the second threshold value calculation unit is used for obtaining a stress value of the annular elastic piece in a closing state of the contact assembly along the circumferential direction of the annular elastic piece according to the outer diameter of the moving contact, the width of the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the moving contact.
3. The system of claim 1, further comprising a shield, wherein a bottom of the shield is connected to the contact block, wherein the shield and the contact block form a placement cavity, wherein the tulip contact finger is positioned in the placement cavity, and wherein the shield is configured to shield the stationary contact from an electric field outside the shield.
4. The system of claim 1, further comprising a repeater wirelessly connected to the stress sensor for receiving the stress signal from the stress sensor and amplifying the stress signal for transmission to the monitoring module.
5. The contact assembly status monitoring system of the substation according to any one of claims 1 to 4, wherein the stress sensor comprises:
the first end and the second end of the strain gauge are connected with the annular elastic piece;
the positive electrode of the energy storage voltage stabilizing module is electrically connected with the first end of the strain gauge, and the negative electrode of the energy storage voltage stabilizing module is electrically connected with the second end of the strain gauge;
The current sensor is connected to a first closed loop formed by the strain gauge and the energy storage voltage stabilizing module and is used for monitoring the current of the first closed loop and generating a corresponding current signal;
and the data processing module is electrically connected with the current sensor and is used for processing the current signal sent by the current sensor to obtain a stress signal corresponding to the annular elastic piece and sending the stress signal to the monitoring module.
6. The contact assembly status monitoring system of the substation of claim 5, wherein the data processing module comprises:
the signal conversion unit is electrically connected with the current sensor and is used for converting a current signal sent by the current sensor into a digital signal;
the data processing unit is electrically connected with the signal conversion unit and is used for calculating the digital signal to obtain a stress signal corresponding to the annular elastic piece;
the signal amplifying unit is electrically connected with the data processing unit and is used for amplifying the stress signal;
and the signal transmitting module is electrically connected with the signal amplifying unit and is used for transmitting the stress signal amplified by the signal amplifying unit to the monitoring module.
7. A method for monitoring the state of a contact assembly of a transformer substation, which is applied to the system for monitoring the state of the contact assembly of the transformer substation according to any one of claims 1 to 6, and is characterized in that the method for monitoring the state of the contact assembly of the transformer substation comprises the following steps:
the stress sensor monitors the stress of the annular elastic piece along the circumferential direction of the annular elastic piece and generates a corresponding stress signal;
the monitoring module compares the stress value corresponding to the stress signal sent by the stress sensor with a first threshold value and a second threshold value respectively to obtain state information of opening and closing of the contact assembly so as to display the state information; the first threshold value is a stress value of the annular elastic piece along the circumferential direction of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger; the second threshold value is a stress value of the annular elastic piece in the circumferential direction of the annular elastic piece when the contact assembly is in a closing state;
the monitoring module compares the stress values corresponding to the stress signals sent by the stress sensor with the first threshold and the second threshold respectively to obtain state information of opening and closing of the contact assembly, so as to display the state information, and the monitoring module comprises:
If the stress value corresponding to the stress signal is equal to the first threshold value, the first analysis unit determines the state information as the state information that the moving contact is not inserted;
if the stress value corresponding to the stress signal is located between the first threshold value and the second threshold value, the second analysis unit determines the state information as the state information of the moving contact, which is not closed;
if the stress value corresponding to the stress signal is equal to the second threshold value, the third analysis unit determines the state information as moving contact closing state information;
and if the stress value corresponding to the stress signal is larger than the second threshold value, the fourth analysis unit determines the state information as bad state information in the moving contact pair.
8. The method for monitoring the state of a contact assembly of a transformer substation according to claim 7, wherein the monitoring module compares the first threshold value and the second threshold value with stress values corresponding to stress signals sent by the stress sensor respectively to obtain state information of opening and closing of the contact assembly, so as to display the state information, and further comprises:
the first threshold calculating unit obtains a stress value borne by the annular elastic piece along the circumferential direction of the plum blossom contact finger before the moving contact is not inserted according to the corresponding diameter of the annular elastic piece before the moving contact is not inserted into the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the annular elastic piece;
And the second threshold value calculation unit obtains a stress value of the annular elastic piece in a closing state of the contact assembly along the circumferential direction of the annular elastic piece according to the outer diameter of the moving contact, the width of the plum blossom contact finger and the rigidity coefficient of the annular elastic piece along the circumferential direction of the moving contact.
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| CN202311414259.6A CN117148230B (en) | 2023-10-30 | 2023-10-30 | State monitoring system and method for contact assembly of transformer substation |
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| CN202311414259.6A CN117148230B (en) | 2023-10-30 | 2023-10-30 | State monitoring system and method for contact assembly of transformer substation |
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