CN108075452B

CN108075452B - Self-protection system for power transmission line

Info

Publication number: CN108075452B
Application number: CN201711431905.4A
Authority: CN
Inventors: 储建华; 高霞
Original assignee: Suzhou Keaijia Automation Technology Co ltd
Current assignee: Inner Mongolia Tata power transmission and Transformation Engineering Co.,Ltd.
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2020-06-09
Anticipated expiration: 2037-12-26
Also published as: CN108075452A

Abstract

The invention discloses a self-protection system of a power transmission line, which comprises at least two three-phase lines which are connected in parallel, wherein a neutral point of each three-phase line is provided with a first electric signal acquisition unit, the input end parallel line of the two three-phase lines is provided with a second electric signal acquisition unit, and the output end parallel line of the two three-phase lines is provided with a third electric signal acquisition unit; a plurality of fault acquisition units; the fault detection device comprises a plurality of fault detection devices and at least one fault isolation device, wherein a conductive connecting arm is arranged on the fault isolation device, two ends of the conductive connecting arm are respectively provided with a conductive plug-in connector, and the conductive plug-in connectors are selectively in conductive contact with electric connection ends at two ends of a fault source; the invention improves the running safety of the transmission line and effectively avoids equipment and lines from being damaged due to faults.

Description

Self-protection system for power transmission line

Technical Field

The invention relates to an intelligent circuit protection system, in particular to a self-protection system for a power transmission line.

Background

The single-phase grounding is the single-phase grounding of a 10kV (35kV) low-current grounding system, and the single-phase grounding fault is the most common fault of a power distribution system and mostly occurs in humid and rainy weather. Due to a plurality of factors such as tree obstacles, single-phase breakdown of insulators on distribution lines, single-phase line breakage, small animal harm and the like. The single-phase grounding not only influences the normal power supply of users, but also can generate overvoltage, burn out equipment and even cause interphase short circuit to enlarge accidents.

In actual operation, the plastic cloth of the brickyard falls on the wire due to strong wind, so that the voltage transformer of the transformer substation is burnt, and equipment damage and large-area power failure accidents are caused. After the single-phase earth fault occurs, resonance overvoltage can be generated, which is several times of the normal voltage, so that the insulation of the power transformation equipment is endangered, and the serious person causes the insulation breakdown of the power transformation equipment, thereby causing more accidents.

After single-phase earth fault takes place, probably take place intermittent type nature arc light ground connection, cause resonance overvoltage, produce several times in normal voltage's overvoltage, overvoltage will further make insulator insulation breakdown on the circuit, causes serious short circuit accident, probably burns out partial distribution transformer simultaneously, makes arrester, fuse insulation breakdown on the circuit, burns out, also can take place electrical fire.

Therefore, a self-protection system for the transmission line is urgently needed, and a fault source is discovered and removed quickly so as not to cause larger influence.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

The invention also aims to provide a self-protection system of the power transmission line aiming at the design defects of the power transmission line, the fault position is automatically judged through the fault acquisition unit and the fault detection device, and the fault source is cut off through the fault isolation device, so that the normal operation of the three-phase line is ensured, the safety of the power grid is protected, the trip range is prevented from being expanded, the reliability of the power transmission line is improved, the operation safety of the power transmission line is improved, and the equipment and the line are effectively prevented from being damaged due to faults.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a power transmission line self-protection system including:

the standby three-phase circuit is arranged on an original three-phase circuit in parallel, the input end of the three-phase circuit is connected with a power supply end, the output end of the three-phase circuit is connected with electric equipment, the head end and the tail end of the original three-phase circuit and the head end and the tail end of the standby three-phase circuit are respectively provided with a three-phase circuit breaker, and a first electric signal acquisition unit is arranged on a neutral point of the three-phase circuit;

the fault acquisition units are arranged on a three-phase line between a head three-phase circuit breaker and a tail three-phase circuit breaker at intervals, each fault acquisition unit comprises three pairs of single-phase circuit breakers, the first single-phase circuit breaker of each pair of single-phase circuit breakers is connected in series on a certain phase line of an original three-phase line, the second single-phase circuit breaker of each pair of single-phase circuit breakers is connected in series on a corresponding phase line of a standby three-phase line, an electric connection end is led out from the output end of each single-phase circuit breaker, so that three pairs of electric connection ends are formed, the second electric signal acquisition units are arranged on the parallel connection line of the input ends of the two three-phase lines, and;

the fault detection device comprises an insulating scanning platform, wherein a plurality of pairs of conductive through holes longitudinally penetrate through the insulating scanning platform, the conductive through holes are arranged at intervals, the upper ends of the conductive through holes protrude out of the upper surface of the insulating scanning platform for a certain distance, a first groove is formed in the upper surface of the insulating scanning platform along the length direction, the conductive through holes are arranged on two sides of the first groove at intervals, the first groove is positioned in the center of the upper surface of the insulating scanning platform, a first linear driving mechanism and a first linear displacement ball grid ruler are arranged in the first groove, and the direction of the first linear displacement ball grid ruler is consistent with the length direction of the insulating scanning platform; a guide block which moves back and forth along the first groove is arranged on a movable block of the first linear driving mechanism, a pair of insulated conductive contact ends which are arranged at intervals are arranged on the guide block, a first reading head is arranged in the guide block, the first reading head is sleeved on the first linear displacement ball grid ruler, the first conductive contact end is connected with the input end of a selection detection unit, and the second conductive contact end is connected with the output end of the selection detection unit; each electric connection end is electrically connected to a conductive column matched with the conductive through hole, the same pair of electric connection ends on the fault acquisition unit are sequentially inserted into the same pair of conductive through holes on the fault detection device through the conductive columns, and the pair of conductive contact ends are driven by the first linear driving mechanism to be sequentially in conductive contact with opposite side walls of the protruding ends of each pair of conductive through holes; and

the fault isolation device is movably arranged on the upper surface of the insulating scanning platform along the length direction of the insulating scanning platform, a second groove is formed in the first end of the upper surface of the insulating scanning platform in the width direction, a third groove is formed in the second end of the upper surface of the insulating scanning platform in the width direction, a second linear driving mechanism is arranged in the second groove, a second linear displacement ball grid ruler is arranged in the third groove, the first end of the fault isolation device is arranged on a movable block of the second linear driving mechanism, a second reading head is arranged at the second end of the fault isolation device, the second reading head is sleeved on the second linear displacement ball grid ruler, a conductive connecting arm is longitudinally and telescopically arranged on the fault isolation device, the conductive connecting arm can move along the width direction of the insulating scanning platform, and the length of the conductive connecting arm is consistent with the linear distance among three continuous conductive through holes, and two ends of the conductive connecting arm are respectively and longitudinally provided with a conductive plug-in connector, the diameter of the conductive plug-in connector is consistent with the inner diameter of the conductive through hole, and the conductive plug-in connector is selectively conductively connected with the conductive through hole in an inserting mode.

Preferably, former three-phase line head end is provided with first three-phase circuit breaker, reserve three-phase line head end is provided with second three-phase circuit breaker, former three-phase line tail end is provided with third three-phase circuit breaker, reserve three-phase line tail end is provided with fourth three-phase circuit breaker, and wherein, first three-phase circuit breaker and second three-phase circuit breaker set up two the parallelly connected end low reaches of input of three-phase line, and third three-phase circuit breaker and fourth three-phase circuit breaker set up two the parallelly connected end upper reaches of output of three-phase line.

Preferably, each the fault acquisition unit sets gradually three-phase line between first three-phase circuit breaker and the third three-phase circuit breaker is on the road, the fault acquisition unit specifically includes:

a first pair of single-phase circuit breakers consisting of a first single-phase circuit breaker connected in series to the first phase line of the original three-phase line and a second single-phase circuit breaker connected in series to the first phase line of the standby three-phase line;

a second pair of single-phase circuit breakers consisting of a third single-phase circuit breaker connected in series to the second phase line of the original three-phase line and a fourth single-phase circuit breaker connected in series to the second phase line of the standby three-phase line;

a third pair of single-phase circuit breakers consisting of a fifth single-phase circuit breaker connected in series on the third phase line of the original three-phase line and a sixth single-phase circuit breaker connected in series on the third phase line of the standby three-phase line.

Preferably, each the equidistant interval of trouble collection unit sets up on the three-phase line, first electric connection is drawn forth to first single-phase circuit breaker output, second electric connection is drawn forth to the single-phase circuit breaker output of second, third electric connection is drawn forth to the single-phase circuit breaker output of third, fourth electric connection is drawn forth to the single-phase circuit breaker output of fourth, fifth electric connection is drawn forth to the single-phase circuit breaker output of fifth, sixth electric connection is drawn forth to the single-phase circuit breaker output of sixth, connects one on every electric connection and leads electrical pillar.

Preferably, a plurality of pairs of the conductive through holes are arranged on the insulating scanning platform at equal intervals, the first electric connection end and the second electric connection end on each fault acquisition unit are sequentially electrically connected into each pair of the conductive through holes on the first insulating scanning platform in a conductive and inserting mode through the conductive columns, the third electric connection end and the fourth electric connection end on each fault acquisition unit are sequentially electrically connected into each pair of the conductive through holes on the second insulating scanning platform in a conductive manner through the conductive columns, and the fifth electric connection end and the sixth electric connection end on each fault acquisition unit are sequentially electrically connected into each pair of the conductive through holes on the third insulating scanning platform in a conductive manner through the conductive columns.

Preferably, first linear driving mechanism includes a driving motor, driving motor sets up insulating scanning platform end, be provided with along length direction in the first recess one with the lead screw that the driving mechanism actuating shaft is connected, the cover is equipped with a movable block on the lead screw, the guide block sets up the upper end at first linear driving mechanism movable block, just a perforation is seted up to the guide block bottom, first reading head sets up the through hole periphery, first linear displacement ball bar chi parallel arrangement is in lead screw one side in the first recess, the guide block passes through the through hole cover is established on the first linear displacement ball bar chi.

Preferably, the pair of conductive contact ends are arranged at the upper end of the guide block, protrude out of the upper surface of the insulating scanning platform for a certain distance, are symmetrically and separately arranged at two sides of the guide block, an insulating block is arranged between the pair of conductive contact ends, a conductive contact head is arranged on each conductive contact end, and the conductive contact ends are in sliding conductive contact with the protruding ends of the conductive through holes through the conductive contact heads.

Preferably, the conductive contact head comprises a fixed conductive seat, a conductive rod, a sliding conductive seat and a conductive shoe, the fixed conductive seat is fixed on the conductive contact end, the conductive rod is vertically arranged at the center of the fixed conductive seat, the conductive shoe is arranged on the sliding conductive seat, the sliding conductive seat is sleeved on the conductive rod and is movably connected with the conductive rod, the sliding conductive seat is in elastic conductive contact with the conductive rod, the conductive shoe is provided with a guide groove in sliding fit with the side wall of the conductive through hole, a guide-in angle is arranged on the outer side of the guide groove, an inwards-concave conductive arc surface is arranged in the guide groove, and the conductive arc surface is in conductive connection with the bottom of the guide groove through an elastic piece.

Preferably, the fault isolation apparatus comprises:

the support is erected on the upper surface of the insulating scanning platform through the supporting rods, the guiding rods are spaced from the upper surface of the insulating scanning platform by a certain distance, the direction of the guiding rods is consistent with the width direction of the insulating scanning platform, the first supporting rod is connected to a movable block of the second linear driving mechanism, a sliding block is arranged on the second supporting rod, the sliding block is sleeved on the second linear displacement ball grid ruler in a sliding mode, the second reading head is arranged inside the sliding block, and the second reading head is wrapped on the periphery of the second linear displacement ball grid ruler in an enveloping mode;

the first telescopic driving mechanism is arranged on the guide rod, a telescopic end of the first telescopic driving mechanism is movably sleeved on the guide rod, and the telescopic distance of the first telescopic driving mechanism is not less than the distance between the pair of conductive contact ends;

the second telescopic driving mechanism is vertically arranged on the telescopic end of the first telescopic driving mechanism, and the telescopic end of the second telescopic driving mechanism faces the upper surface of the insulated scanning platform; and

the length direction of the conductive connecting arm is consistent with that of the insulating scanning platform, the center of the conductive connecting arm is arranged at the telescopic end of the second telescopic driving mechanism, the distance between conductive plug-in connectors at two sides of the conductive connecting arm is consistent with the linear distance between three continuous conductive through holes, the conductive plug-in connectors are matched with the conductive through holes, and the conductive plug-in connectors are selectively plugged in the conductive through holes from the upper surface of the insulating scanning platform.

Preferably, the selection detection unit comprises a first resistor, a prompting lamp, a current acquisition unit and a second resistor which are sequentially connected in series, the first resistor is connected with a first conductive contact, and the second resistor is connected with a second conductive contact.

The invention at least comprises the following beneficial effects:

1. according to the invention, the fault property of the power transmission line is rapidly judged, and the specific line with the fault can be identified, so that the fault can be rapidly found by workers and timely solved, the fault range is prevented from being further expanded, and the reliability of the power transmission line is further ensured;

2. after the fault occurs, the power transmission line can locate the fault occurrence place and effectively remove the fault occurrence place, so that the fault solving efficiency of workers is improved;

3. the power transmission line adopts two three-phase power supply lines which are arranged in parallel, wherein one line cannot influence the normal work of the power transmission line after being in fault, so that the power supply continuity of the power transmission line is improved, and meanwhile, after the fault occurs, a fault point can be cut off from a power grid through the fault acquisition unit, the fault detection device and the fault isolation device, so that the fault maintenance is ensured to be carried out under the condition that the power transmission line normally supplies power, and the technical problem that the power supply is influenced by power failure operation is solved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a system circuit diagram of a power transmission line of the present invention;

FIG. 2 is a schematic structural diagram of a fault acquisition unit;

FIG. 3 is a schematic view of an assembled structure of the fault isolation device and the fault detection device;

FIG. 4 is a mechanical schematic diagram of a first linear drive mechanism;

FIG. 5 is a schematic view of a pair of conductive contact ends;

FIG. 6 is a schematic diagram of an internal circuit structure of the selection detection unit;

fig. 7 is a schematic structural view of the conductive plug being plugged in the conductive through hole.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

The invention provides a self-protection system of a power transmission line, which comprises a standby three-phase line and original three-phase lines arranged in parallel, wherein two three-phase lines are arranged in parallel to build a power supply network in the embodiment, and two power transmission three-phase lines are connected in parallel at an input end and an output end.

The input end of each three-phase line is connected with a three-phase power source end after being connected in parallel, the output end of each three-phase line is connected with electric equipment after being connected in parallel, two three-phase power supply lines are arranged in parallel and do not affect each other, a first electric signal acquisition unit 11 is arranged on a neutral point of each three-phase line and is used for acquiring neutral point voltage of the three-phase power supply line in the power transmission line, when the power transmission line normally operates, the neutral point voltage is zero, when a single-phase ground fault occurs on each three-phase line, the neutral point voltage is increased to be phase voltage, and the single-phase ground fault occurring in each three-phase line can be judged through the neutral point.

Specifically, the three-phase three.

The input end parallel line of two three-phase lines is provided with a second electric signal acquisition unit 12, the output end parallel line of two three-phase lines is provided with a third electric signal acquisition unit 13, wherein the head end of the original three-phase line is provided with a first three-phase circuit breaker K1, the head end of the standby three-phase line is provided with a second three-phase circuit breaker K2, the tail end of the original three-phase line is provided with a third three-phase circuit breaker K3, and the tail end of the standby three-phase line is provided with a fourth three-phase circuit breaker K4, wherein the first three-phase circuit breaker K1 and the second three-phase circuit breaker K2 are arranged at the downstream of the input parallel end of the two three-phase lines, the third three-phase circuit breaker 5639 and the fourth three-phase circuit breaker K4 are arranged at the upstream of the output parallel end of the two three-phase lines, and when the three-phase lines have faults, the original, the spare three-phase line is cut through the second three-phase circuit breaker K2 and the fourth three-phase circuit breaker K4, and normal power supply operation of the three-phase line without faults is guaranteed.

Be provided with an alarm unit and connect respectively first signal of telecommunication acquisition element 11, second signal of telecommunication acquisition element 12 and third signal of telecommunication acquisition element 13, after first signal of telecommunication acquisition element 11 gathered fault voltage, can control alarm unit and report to the police, send fault signal to do benefit to the staff and in time discover and solve the trouble.

Meanwhile, the second electrical signal acquisition unit 12 can acquire the voltage, the current and the flow direction of each phase on the standby three-phase line, when the power transmission line is in normal power supply operation, the current flow directions acquired by the second electrical signal acquisition unit 12 and the third electrical signal acquisition unit 13 are consistent, when a certain phase in the three-phase line has a ground fault, the corresponding phase with the fault and the voltage when the fault phase is normal can be judged through the three-phase electrical signals acquired by the second electrical signal acquisition unit 12, specifically, the respective phase voltage of two phases without the ground fault is increased to the line voltage, the fault phase voltage is changed to 0, and the voltage when the fault phase is normal can be calculated according to the current and the flow direction of the non-fault two phases.

Specifically, for example, after a ground fault occurs to a first phase on a three-phase line of the power transmission line, and when the normal operating voltage of the first phase is calculated to be a positive voltage, if currents of corresponding fault phases in the second electrical signal acquisition unit 12 and the third electrical signal acquisition unit 13 simultaneously flow out, the ground fault occurs to the first phase in the original three-phase line; if the currents of the corresponding fault phases in the second electric signal acquisition unit 12 and the third electric signal acquisition unit 13 simultaneously flow inwards, the first phase in the standby three-phase line has a ground fault. After a first phase on a three-phase line of the power transmission line has a ground fault, when the normal operation voltage of the first phase is calculated to be negative voltage, if currents of corresponding fault phases in the second electric signal acquisition unit 12 and the third electric signal acquisition unit 13 simultaneously flow outwards, the first phase in the standby three-phase line has the ground fault; if the currents of the corresponding fault phases in the second electrical signal acquisition unit 12 and the third electrical signal acquisition unit 13 simultaneously flow inwards, the first phase in the original three-phase line has a ground fault.

From this, can judge transmission line ground fault through first signal of telecommunication collection unit 11, and send alarm signal, can specifically judge the three-phase line and the phase line that take place ground fault through second signal of telecommunication collection unit 12 and third signal of telecommunication collection unit 13, if ground fault takes place for former three-phase line, then control first three-phase circuit breaker K1 and third three-phase circuit breaker K3 and break simultaneously, if reserve three-phase line ground fault takes place, then control second three-phase circuit breaker K2 and fourth three-phase circuit breaker K4 and break simultaneously.

Specifically, after the ground fault occurs, the neutral point is grounded through the first reactance and the fuse, in the embodiment, the first reactance is a reactor with a small reactance value, when the ground fault occurs, the grounding current flowing through the first reactance is large, so that the action response time of the three-phase circuit breakers at two ends of the grounding line is accelerated, the three-phase circuit breakers at two ends are rapidly switched off, the fault line is cut off, the fault occurrence time is reduced, the damage to line equipment is avoided, the tripping of the circuit breaker at the upper stage is avoided, the further expansion of the fault influence range is avoided, because the grounding current on the first circuit is large, the fuse is also fused immediately when the three-phase circuit breakers at two ends of the grounding line respond, the large grounding current is prevented from being carried out for a long time, the contacts of the three-phase circuit breakers are damaged, the three-phase circuit breakers are also facilitated to be switched off, after the three-phase circuit breaker is switched on, the neutral point is grounded through the second circuit, the second reactance is a reactor with a large reactance value, and after the ground fault occurs, the grounding current flowing through the second reactance is small, so that the three-phase circuit breaker can be directly switched on and switched off, the switching-on and switching-off time is shortened, and the three-phase circuit and equipment are protected. And after the fault is repaired, the fuse is replaced again, and the switch is disconnected.

On the other hand, because the grounding current of the fault point is capacitive current, the neutral point is grounded through the first reactance or the second reactance, the grounding current is inductive current, the direction of the grounding current is opposite to that of the fault point, the grounding current is effectively compensated with the grounding current of the fault point, the grounding arc current of the fault point is eliminated, the fault point is enabled to rapidly extinguish arc, the three-phase circuit breakers at the two ends are rapidly switched on and off, the safety of the grounding point is guaranteed, and the reliability and the safety of the power transmission line are improved.

The plurality of fault collection units 20 are arranged on three-phase lines between the head three-phase circuit breaker and the tail three-phase circuit breaker at intervals, namely, the fault collection units 20 are arranged on an original three-phase line between the first three-phase circuit breaker K1 and the third three-phase circuit breaker K3 and a standby three-phase line between the second three-phase circuit breaker K2 and the fourth three-phase circuit breaker K4, and the fault collection units 20 are used for judging the specific positions of ground faults.

The fault acquisition unit 20 comprises three pairs of single-phase circuit breakers, wherein the first single-phase circuit breaker in each pair of single-phase circuit breakers is connected in series on a certain phase line of an original three-phase line, the second single-phase circuit breaker is connected in series on a corresponding phase line of a standby three-phase line, and an electric connection end is led out from the output end of each single-phase circuit breaker, so that three pairs of electric connection ends are formed, and each single-phase circuit breaker is in a closed state during normal operation.

Specifically, the fault collection unit 20 specifically includes:

a first pair of single-phase circuit breakers consisting of a first single-phase circuit breaker 211 and a second single-phase circuit breaker 212, two

contacts

213, 214 of the first single-phase circuit breaker 211 being connected in series on a first phase line of the original three-phase line, and two

contacts

215, 216 of the second single-phase circuit breaker 212 being connected in series on a first phase line of the backup three-phase line;

a second pair of single-phase breakers consisting of a third single-phase breaker 221 and a fourth single-phase breaker 222, the third single-phase breaker 221 being connected in series to the second phase line of the original three-phase line, and the fourth single-phase breaker 222 being connected in series to the second phase line of the standby three-phase line;

and a third pair of single-phase breakers consisting of a fifth single-phase breaker 231 and a sixth single-phase breaker 232, the fifth single-phase breaker 231 being connected in series to the third phase line of the original three-phase line, and the sixth single-phase breaker 232 being connected in series to the third phase line of the standby three-phase line.

In this embodiment, according to the length of the line between the head and the tail of the three-phase line, a plurality of nodes are equidistantly divided from the three-phase line, and a fault acquisition unit 20 is arranged at the same node on the original three-phase line and the standby three-phase line, so that the fault acquisition units 20 are equidistantly arranged on the three-phase line. The first single-phase circuit breaker 211 output leads to a first electrical connection 217, the second single-phase circuit breaker 212 output leads to a second electrical connection 218, the third single-phase circuit breaker 221 output leads to a third electrical connection 227, the fourth single-phase circuit breaker 222 output leads to a fourth electrical connection 228, the fifth single-phase circuit breaker 231 output leads to a fifth electrical connection 237, and the sixth single-phase circuit breaker 232 output leads to a sixth electrical connection 238.

The fault detection device comprises an insulating scanning platform 30, a plurality of pairs of conductive through holes 34 are longitudinally arranged on the insulating scanning platform 30 in a penetrating manner, the conductive through holes 34 are arranged at intervals, as shown in the figure, each pair of conductive through holes are sequentially arranged along the length direction of the insulating scanning platform 30, each conductive through hole is a hollow conductive cylinder, the hollow conductive cylinders and the insulating scanning platform are formed together, the upper ends of the hollow conductive cylinders protrude out of the upper surface of the insulating scanning platform 30 for a certain distance, each electric connection end is electrically connected to a conductive column matched with the conductive through hole, the same pair of electric connection ends on the fault acquisition unit are sequentially inserted in the same pair of conductive through holes 34 on the fault detection device through the conductive columns, so that the electric connection ends are electrically connected with the corresponding conductive through holes, and the conductive columns are inserted in the conductive through holes from the bottom of the insulating, electrically connect electrically conductive through-hole and electric connection end through leading electrical pillar, make things convenient for each electric connection end and insulating scanning platform's being connected, insulating scanning platform can be general.

A first groove 31 is formed in the upper surface of the insulating scanning platform 30 along the length direction, the conductive through holes 34 are arranged on two sides of the first groove 31 at intervals, so that two rows of conductive through holes 34 are formed on two sides of the first groove, the first row of conductive through holes are correspondingly connected with a certain phase of an original three-phase circuit, the second row of conductive through holes are correspondingly connected with a corresponding phase of a standby three-phase circuit, the first groove 31 is located in the center of the width direction of the upper surface of the insulating scanning platform, a first linear driving mechanism and a first linear displacement ball grid ruler 313 are arranged in the first groove 31, and the direction of the first linear displacement ball grid ruler 313 is consistent with the length direction of the insulating scanning platform.

A guide block 126 which moves back and forth along the first groove 31 is arranged on a movable block of the first linear driving mechanism, a pair of insulated conductive contact ends 321 and 322 which are arranged at intervals are arranged on the guide block, a first reading head is arranged in the guide block, the first reading head is sleeved on the first linear displacement ball grid ruler 313 and used for measuring the moving distance and the position of the guide block 126, the first conductive contact end 321 is connected with the input end of a selective detection unit, the second conductive contact end 322 is connected with the output end of the selective detection unit, and the pair of conductive contact ends are driven by the first linear driving mechanism to be in conductive contact with opposite side walls of each pair of the protruding ends of the conductive through hole in sequence.

Specifically, the first linear driving mechanism includes a driving motor 311, the driving motor 311 is disposed at the end of the insulating scanning platform 30, a lead screw 312 connected to the driving shaft of the driving mechanism is disposed in the first groove along the length direction, a movable block is sleeved on the lead screw 312, the driving motor drives the lead screw to rotate so as to drive the movable block to move back and forth in the first groove, the guide block 126 is disposed at the upper end of the movable block of the first linear driving mechanism, so that the guide block is controlled by the driving mechanism to move back and forth along the first groove, a through hole is transversely formed at the bottom of the guide block 126, the first reading head is disposed at the periphery of the through hole, the first linear displacement ball grid ruler 313 is disposed in parallel in the first groove at one side of the lead screw 312, the guide block is sleeved on the first linear displacement ball grid ruler through the through hole, therefore, when the guide block is driven to move back and forth along the first groove, the moving distance and the position of the guide block can be read by the first reading head, the moving distance and the position of the conductive contact end are accurately controlled, the conductive contact end is selectively in conductive contact with each pair of the conductive through holes, and electric signals between each pair of the electric connection ends are collected to the selective detection unit.

That is to say, the input end and the output end of the selective detection unit are in conductive contact with the two protruding ends of the conductive through hole in the same pair, so that current signals between the original three-phase line and the same phase on the standby three-phase line at the same node are collected into the selective detection unit and are used for analyzing the position of a fault source.

The pair of conductive contact ends are arranged at the upper end of the guide block and move synchronously with the guide block, the conductive contact ends protrude out of the upper surface of the insulating scanning platform for a certain distance, so that the conductive contact ends and the protruding ends of the conductive through holes are at the same horizontal height, conductive contact between the conductive contact ends and the protruding ends of the conductive through holes is facilitated, the pair of conductive contact ends 321 and 322 are symmetrically and separately arranged on two sides of the upper end of the guide block 126, an insulating block is arranged between the pair of conductive contact ends, the conductive contact ends 321 and 322 are arranged in an insulating and spaced mode, a conductive contact head is arranged on each conductive contact end, and the conductive contact ends are in sliding conductive contact with the protruding ends of the conductive through holes through the conductive contact heads.

The conductive contact head comprises a fixed conductive seat 121, a conductive rod 122, a sliding conductive seat 123 and a conductive shoe 124, the fixed conductive seat is connected to the conductive contact end, the conductive rod is vertically arranged at the center of the fixed conductive seat, the conductive shoe is arranged on the sliding conductive seat, the sliding conductive seat is sleeved with the conductive rod, the sliding conductive seat is in elastic conductive contact with the conductive rod to provide a buffer distance, the conductive shoe is provided with a guide groove in sliding fit with the conductive contact end, a guide angle is arranged on the outer side of the guide groove to facilitate the sliding contact of the conductive rod and the conductive contact head, a sunken conductive arc surface 125 is arranged in the guide groove, and the conductive arc surface is in conductive connection with the bottom of the guide groove through an elastic part 127.

Conductive arc 125 with conductive through-hole protrusion end sliding fit, when driving motor 311 drive guide block removed,

conductive contact end

321 and 322 synchronous motion, until with a pair of conductive through-hole protrusion end contact, at this moment, the conductive through-hole lateral wall slided into the guide slot through the angle of introduction, with conductive contact head conductive contact, because the slip conductive seat with conductive rod elastic conductive contact, just conductive arc through an elastic component 127 with the guide slot bottom conductive connection, effectively absorbed the overtravel or the understroke between conductive arc 125 and the conductive through-hole protrusion end through two-stage elastic contact for conductive through-hole protrusion end lateral wall forms effectual conductive contact with conductive arc 125, along with the continuation removal of conductive block, realizes selecting the signal of telecommunication between two three-phase lines of each node of detecting element collection each looks.

Specifically, three fault detection devices are required in this embodiment, one fault detection device is used to collect current signals between a certain phase at the same node on two three-phase lines, and the three fault detection devices can collect current signals between each phase at the same node on two three-phase lines.

A plurality of pairs of conductive through holes 34 are formed in an insulating scanning platform in the fault detection device in a penetrating mode at equal intervals and penetrate through the upper surface and the lower surface of the insulating scanning platform, each pair of conductive through holes are arranged on two sides of the first groove in a row to form two rows of parallel conductive through holes, and the distance between a pair of conductive contact ends is consistent with the distance between the outer side walls of the pair of conductive through holes, so that the pair of conductive contact ends are in conductive contact with the opposite side walls of the pair of conductive through holes in the moving process.

The conductive through holes are arranged at intervals in an insulating manner, the first electrical connection end 217 and the second electrical connection end 218 on each fault collection unit 20 are respectively connected with a conductive column, the first electrical connection end 217 and the second electrical connection end 218 on each fault collection unit 20 are sequentially connected with the conductive through hole on the first fault detection device in an electrically conductive and inserting manner through the respective conductive column, the third electrical connection end 227 and the fourth electrical connection end 228 on each fault collection unit 20 are sequentially connected with the conductive through hole on the second fault detection device in an electrically conductive and inserting manner through the respective conductive column, and the fifth electrical connection end 237 and the sixth electrical connection end 238 on each fault collection unit 20 are sequentially connected with the conductive through hole on the third fault detection device in an electrically conductive and inserting manner through the respective conductive column.

Each conducting column is inserted into the conducting through hole from the bottom of the insulating scanning platform, and the length of each conducting column is smaller than the depth of the conducting through hole, so that a space is reserved at the upper end of the conducting through hole into which the conducting column is inserted.

Specifically, as shown in the figure, the first insulating scanning platform includes a first pair of conductive vias 341, 342, a second pair of conductive vias 343, 344, a third pair of conductive vias 345, 346, and so on, where the first fault collection unit 20 is disposed at a first node, the second fault collection unit 20 is disposed at a second node, and so on, the first electrical connection terminal 217 on the first fault collection unit 20 is plugged to the bottom of the conductive via 341 through a conductive pillar, the second electrical connection terminal 218 is plugged to the bottom of the conductive via 342 through a conductive pillar, the first electrical connection terminal 217 on the second fault collection unit 20 is plugged to the bottom of the conductive via 343 through a conductive pillar, and the second electrical connection terminal 218 is plugged to the bottom of the conductive via 344 through a conductive pillar; the first electrical connection terminal 217 on the third fault collecting unit 20 is inserted into the bottom of the conductive through hole 345 through a conductive post, the second electrical connection terminal 218 is inserted into the bottom of the conductive through hole 346 through a conductive post, and so on, the first electrical connection terminal 217 and the second electrical connection terminal 218 on all the fault collecting units 20 are sequentially conductively inserted into the conductive through hole of the insulating scanning platform on the first fault detecting device, the third electrical connection terminal 227 and the fourth electrical connection terminal 228 on all the fault collecting units 20 are sequentially conductively inserted into the conductive through hole of the insulating scanning platform on the second fault detecting device, and the fifth electrical connection terminal 237 and the sixth electrical connection terminal 238 on all the fault collecting units 20 are sequentially conductively inserted into the conductive through hole of the insulating scanning platform on the first fault detecting device.

The fault isolation device is movably arranged on the upper surface of the insulating scanning platform 30 along the length direction of the insulating scanning platform, in the embodiment, a second groove 33 is arranged at a first end of the upper surface of the insulating scanning platform in the width direction, a third groove 36 is arranged at a second end of the upper surface of the insulating scanning platform in the width direction, a second linear driving mechanism is arranged in the second groove 33, a second linear displacement ball grid ruler is arranged in the third groove 36, a first end of the fault isolation device is arranged on a movable block of the second linear driving mechanism, the fault isolation device is driven by the second linear driving mechanism to move back and forth on the upper surface of the insulating scanning platform 30 along the second groove 33 and the third groove 36, a second reading head is arranged at a second end of the fault isolation device, and the second reading head is sleeved on the second linear displacement ball grid ruler, and measuring the moving distance and the position of the fault isolation device by the second linear displacement ball grid ruler and the second reading head along with the movement of the fault isolation device so as to accurately control the moving distance and the position of the fault isolation device.

The fault isolation device is characterized in that a conductive connecting arm is longitudinally and telescopically arranged on the fault isolation device, the conductive connecting arm can move along the width direction of the insulating scanning platform, the length of the conductive connecting arm is consistent with the linear distance between three continuous conductive through holes, two ends of the conductive connecting arm are respectively and longitudinally provided with a conductive plug-in connector, the diameter of each conductive plug-in connector is consistent with the inner diameter of each conductive through hole, so that the conductive plug-in connectors are matched with the conductive through holes, and the conductive plug-in connectors are selectively and conductively connected with the conductive through holes.

After the conductive columns are inserted, spaces are reserved on the upper portions of the conductive through holes, and when the conductive inserting connectors are inserted into the upper ends of the corresponding conductive through holes, the electric connection ends connected with the conductive columns at the positions can be in conductive connection, so that the two nodes are in conductive connection, and a fault source is cut off.

Specifically, the fault isolation apparatus includes:

the support, it comprises bracing piece 50 and the guide bar 62 of connection between bracing piece 50 that two are discrete, the support passes through the bracing piece 50 and erects in insulating scanning platform upper surface, just guide bar 62 and insulating scanning platform upper surface interval certain distance, just the direction of guide bar 62 with insulating scanning platform's width direction is unanimous, the first bracing piece 50 is connected on the movable block of second linear driving mechanism, the second be provided with a slider on the bracing piece 50, the slider cover is established and is slided on the second linear displacement ball grid chi, the second reading head sets up inside the slider, and the envelope of second reading head is in the periphery of second linear displacement ball grid chi, when second linear driving mechanism movable block round trip movement in the second recess, can drive whole fault isolation device at insulating scanning platform upper surface along insulating scanning platform's length direction round trip movement, in the process, the moving distance and the position of the fault isolation device are collected by the second linear displacement ball grid ruler and the second reading head in real time to be fed back to the controller, and the moving distance and the position of the fault isolation device are further accurately controlled;

the first telescopic driving mechanism 61 is arranged on the guide rod 62, a telescopic end of the first telescopic driving mechanism is movably sleeved on the guide rod 62, a telescopic end of the first telescopic driving mechanism 61 moves back and forth on the guide rod 62, and the telescopic distance of the first telescopic driving mechanism 61 is not less than the distance between the pair of conductive contact ends;

the second telescopic driving mechanism 60 is vertically arranged on the telescopic end of the first telescopic driving mechanism 61, the first telescopic driving mechanism 61 controls the second telescopic driving mechanism 60 to move back and forth on the guide rod 62, and the telescopic end of the second telescopic driving mechanism 60 faces the upper surface of the insulating scanning platform; and

the length direction of the conductive connecting arm 70 is consistent with that of the insulating scanning platform, the center of the conductive connecting arm is arranged at the telescopic end of the second telescopic driving mechanism, the distance between the conductive connection-pegs 80 at two sides of the conductive connecting arm 70 is consistent with the linear distance between three continuous conductive through holes, the conductive connection-pegs 80 are matched with the conductive through holes, when the conductive connection-pegs 80 are connected in the conductive through holes, the conductive connection-pegs 80 are in conductive connection with the conductive through holes, the conductive connecting arm is controlled by the second telescopic driving mechanism and moves back and forth in the longitudinal direction, and the conductive connection-pegs 80 are selectively connected in the conductive through holes from the upper surface of the insulating scanning platform in a plugging mode, so that the two conductive through holes are in conductive connection through the conductive connecting arm 70.

Adjust the electrically conductive linking arm 70 through first flexible actuating mechanism 61 and be located first row electrically conductive through-hole or second row electrically conductive through-hole top, adjust electrically conductive bayonet joint 80 through the straight line actuating mechanism of second and be located above which two electrically conductive through-holes, adjust the height of electrically conductive bayonet joint 80 through the flexible actuating mechanism 60 of second for electrically conductive bayonet joint 80 inserts in the electrically conductive through-hole of corresponding position department, with the electrically conductive through-hole conductive contact of this position department.

Specifically, as shown in the figure, when the guide block is driven to move, the two conductive contact ends 321 and 322 move synchronously and selectively contact with the protruding ends of each pair of conductive through holes, when the position of the guide block is adjusted, the conductive contact ends 321 and 322 can simultaneously and conductively contact with the protruding ends of a pair of conductive through holes, for example, the conductive contact end 321 is in conductive contact with the protruding end of the conductive through hole 341, and the conductive contact end 322 is simultaneously in conductive contact with the protruding end of the conductive through hole 342, because the conductive column in the conductive through hole 341 is connected to the first electrical connection end 217 on the first failure acquisition unit 20, and the conductive column in the conductive through hole 342 is connected to the second electrical connection end 218 on the first failure acquisition unit 20, the selective detection unit can measure the electrical signal between the first electrical connection end 217 and the second electrical connection end 218, that is, the electrical signal between the first phases of two three-phase lines, along with the movement of the guide block, the two conductive contact ends 321 and 322 are in conductive contact with the protruding ends of the next pair of conductive through holes, the selection detection unit acquires an electric signal between first phases of two three-phase lines at a second node, and so on, the selection detection unit on the second fault detection device acquires an electric signal between second phases of the two three-phase lines at each node, the selection detection unit on the third fault detection device acquires an electric signal between third phases of the two three-phase lines at each node, the first linear displacement ball grid ruler is matched with the first reading head for use, so that the position of the guide block is accurately controlled, the conductive contact ends 321 and 322 can be in conductive contact with the protruding ends of the pair of conductive through holes at each time, and the electric signals between the same phases of the two three-phase lines.

In this embodiment, the selection detection unit includes a first resistor R1, a warning light 51, a current collection unit 52, and a second resistor R2 that are sequentially connected in series, where the first resistor R1 and the second resistor R2 are large resistors, so that when a ground fault occurs, a large-resistor grounding system is formed through the first resistor R1 and the second resistor R2, and the current collected by the current collection unit 52 is a grounding current passing through the first resistor R1 and the second resistor R2. The first resistance is connected with the first conductive contact head, the second resistance is connected with the second conductive contact head, namely, the two three-phase lines are conducted between certain phases through the selection detection unit, the current between the two three-phase lines is collected through the current collection unit 52, once the current passes through the prompting lamp 51, the prompting is sent, when the normal operation is carried out, the current cannot be generated between any phases of the two three-phase lines, and after the ground fault occurs, the current can be generated between fault phases of the two three-phase lines.

When the ground fault occurs, the three-phase line with the ground fault is cut off, for example, when the ground fault occurs in the first phase of the original three-phase line, the original three-phase line is cut off from the power transmission line through a first three-phase circuit breaker K1 and a third three-phase circuit breaker K3, the normal operation of the power transmission line is kept through a standby three-phase line, after the fault occurs, current signals between the first phases of the two three-phase lines at each node are quickly detected through a fault detection device, the moving distance of a guide block is controlled through a first linear ball-moving grid ruler and a first reading head, the accurate and quick current measurement between the first phases of the two three-phase lines is realized, when the ground fault occurs in the first phase of the original three-phase line, the first phase of the standby three-phase line normally operates, and when the first phase of the two three-phase lines is connected through a selection detection unit, the first phase of the standby three-phase line forms a large resistance connection between a first resistor R1 and a In the ground system, the ground current which is closer to the ground point is larger, the current signal detected by the detection unit is the ground current at different nodes, and finally two nodes with the largest contact current are detected, namely the ground point is generated on a line between the two nodes.

In the technical scheme, after the grounding point is judged, the single-phase circuit breakers on two adjacent fault acquisition units of the grounding point are disconnected, the fault isolation device starts to act, the position and the moving distance of the fault isolation device are adjusted by the second linear driving mechanism, the transverse position and the height of the conductive plug-in connector 80 are adjusted by the first telescopic driving mechanism and the second telescopic driving mechanism, finally, the first conductive plug-in connector 80 is inserted into the conductive through hole corresponding to the power connection end on the second fault acquisition unit on the upstream of the grounding point until the conductive through hole at the position is in conductive contact, the second conductive plug-in connector 80 is inserted into the conductive through hole corresponding to the power connection end on the first fault acquisition unit on the downstream of the grounding point until the conductive through hole at the position is in conductive contact, so that the front side and the rear side of the grounding point are restored to be in conductive connection, and the, after the grounding point is cut off from the line, the first three-phase circuit breaker K1 and the third three-phase circuit breaker K3 can be controlled to be switched on simultaneously, the two three-phase lines are restored to be switched on, the single-path three-phase line is prevented from running independently for a long time, and once the grounding fault occurs again, the whole power transmission line independently supported by the single-path three-phase line can be completely powered off, so that the power transmission line is paralyzed. After the grounding point is cut off from the line, the fault line can be maintained without influencing the normal operation of the power transmission line, after the fault line is maintained, the two disconnected single-phase circuit breakers are closed, the two ends of the automatic plugging equipment are disconnected from the corresponding electric contact ends, the cut-off line can be connected into the operating three-phase line again, and the whole power transmission line can be recovered as before.

As shown in fig. 7, a fault source occurs between the second node and the third node of the first phase on the original three-phase line, two conductive plugs 80 are plugged in the conductive through

holes

341 and 345, the third single-phase circuit breaker and the fifth single-phase circuit breaker are disconnected, and the line between the second node and the third node of the fault phase line is cut off from the power supply line, so that the normal operation of the power supply line is not affected.

According to the invention, the fault property of the power transmission line is rapidly judged, and the specific line with the fault can be identified, so that the fault can be rapidly found and timely solved by workers, the fault range is prevented from being further expanded, and the reliability of the power transmission line is ensured; after the fault occurs, the power transmission line can locate the fault occurrence place and effectively remove the fault occurrence place, so that the fault solving efficiency of workers is improved; meanwhile, the power transmission line adopts two three-phase power supply lines which are arranged in parallel, wherein one line cannot influence the normal work of the power transmission line after being in fault, so that the power supply continuity of the power transmission line is improved, and meanwhile, after the fault occurs, a fault point can be cut off from a power grid through the fault acquisition unit, the fault detection device and the fault isolation device, so that the fault maintenance is ensured under the condition that the power transmission line normally supplies power, and the technical problem that the power supply is influenced by power failure operation is solved.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A self-protection system for a power transmission line is characterized by comprising:

the fault isolation device is movably arranged on the upper surface of the insulating scanning platform along the length direction of the insulating scanning platform, a second groove is formed in the first end of the upper surface of the insulating scanning platform in the width direction, a third groove is formed in the second end of the upper surface of the insulating scanning platform in the width direction, a second linear driving mechanism is arranged in the second groove, a second linear displacement ball grid ruler is arranged in the third groove, the first end of the fault isolation device is arranged on a movable block of the second linear driving mechanism, a second reading head is arranged at the second end of the fault isolation device, the second reading head is sleeved on the second linear displacement ball grid ruler, a conductive connecting arm is longitudinally and telescopically arranged on the fault isolation device, the conductive connecting arm can move along the width direction of the insulating scanning platform, and the length of the conductive connecting arm is consistent with the linear distance among three continuous conductive through holes, two ends of the conductive connecting arm are respectively and longitudinally provided with a conductive plug-in connector, the diameter of the conductive plug-in connector is consistent with the inner diameter of the conductive through hole, and the conductive plug-in connector is selectively conductively plugged with the conductive through hole;

wherein, first linear driving mechanism includes a driving motor, driving motor sets up insulating scanning platform end, be provided with along length direction in the first recess one with actuating mechanism actuating shaft connected's lead screw, the cover is equipped with a movable block on the lead screw, the guide block sets up the upper end at first linear driving mechanism movable block, just a perforation hole is seted up to the guide block bottom, first reading head sets up the through hole periphery, first linear displacement ball bar chi parallel arrangement is in lead screw one side in the first recess, the guide block passes through the through hole cover is established on the first linear displacement ball bar chi.

2. The self-protection system of the transmission line of claim 1, wherein the head end of the original three-phase line is provided with a first three-phase circuit breaker, the head end of the standby three-phase line is provided with a second three-phase circuit breaker, the tail end of the original three-phase line is provided with a third three-phase circuit breaker, and the tail end of the standby three-phase line is provided with a fourth three-phase circuit breaker, wherein the first three-phase circuit breaker and the second three-phase circuit breaker are arranged at the downstream of the input parallel ends of the two three-phase lines, and the third three-phase circuit breaker and the fourth three-phase circuit breaker are arranged at the upstream.

3. The transmission line self-protection system of claim 2, wherein each of the fault collection units is sequentially disposed on a three-phase line between the first three-phase circuit breaker and a third three-phase circuit breaker, and the fault collection unit specifically includes:

4. The self-protection system of the transmission line according to claim 3, wherein each of the fault collection units is disposed on the three-phase line at equal intervals, the first single-phase circuit breaker output end leads out a first electrical connection, the second single-phase circuit breaker output end leads out a second electrical connection, the third single-phase circuit breaker output end leads out a third electrical connection, the fourth single-phase circuit breaker output end leads out a fourth electrical connection, the fifth single-phase circuit breaker output end leads out a fifth electrical connection, the sixth single-phase circuit breaker output end leads out a sixth electrical connection, and each electrical connection is connected with a conductive column.

5. The self-protection system of the power transmission line of claim 4, wherein a plurality of pairs of the conductive through holes are arranged on the insulating scanning platform at equal intervals and penetrate through the upper and lower surfaces of the insulating scanning platform, each pair of the conductive through holes are arranged on two sides of the first groove, the distance between a pair of the conductive contact ends is consistent with the distance between the outer side walls of a pair of the conductive through holes, the first electrical connection end and the second electrical connection end on each fault acquisition unit are sequentially electrically connected to each pair of the conductive through holes on the first insulating scanning platform through the conductive columns in a conductive manner, the third electrical connection end and the fourth electrical connection end on each fault acquisition unit are sequentially electrically connected to each pair of the conductive through holes on the second insulating scanning platform through the conductive columns in a conductive manner, and the fifth electrical connection end and the sixth electrical connection end on each fault acquisition unit are sequentially electrically connected to the third electrical connection end through the conductive columns in a conductive manner Each pair of the conductive through holes on the insulating scanning platform.

6. The self-protection system of the power transmission line of claim 5, wherein a pair of the conductive contact ends are arranged at the upper end of the guide block, the conductive contact ends protrude out of the upper surface of the insulating scanning platform for a certain distance, the pair of the conductive contact ends are symmetrically and separately arranged at two sides of the guide block, an insulating block is arranged between the pair of the conductive contact ends, a conductive contact head is arranged on the conductive contact ends, and the conductive contact ends are in sliding conductive contact with the protruding ends of the conductive through holes through the conductive contact heads.

7. The self-protection system of the power transmission line according to claim 6, wherein the conductive contact head comprises a fixed conductive seat, a conductive rod, a sliding conductive seat and a conductive shoe, the fixed conductive seat is fixed on the conductive contact end, the conductive rod is vertically arranged at the center of the fixed conductive seat, the conductive shoe is arranged on the sliding conductive seat, the sliding conductive seat is movably sleeved on the conductive rod, the sliding conductive seat is in elastic conductive contact with the conductive rod, the conductive shoe is provided with a guide groove in sliding fit with the side wall of the conductive through hole, a guide-in angle is arranged on the outer side of the guide groove, a concave conductive arc surface is arranged in the guide groove, and the conductive arc surface is in conductive connection with the bottom of the guide groove through an elastic member.

8. The transmission line self-protection system of claim 7, wherein the fault isolation device comprises:

9. The self-protection system of the transmission line of claim 8, wherein the selection detection unit comprises a first resistor, a warning light, a current collection unit and a second resistor which are sequentially connected in series, the first resistor is connected with the first conductive contact, and the second resistor is connected with the second conductive contact.