CN111426916B - A method and system for simulating grounding pole line faults - Google Patents
A method and system for simulating grounding pole line faults Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
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- 229910052802 copper Inorganic materials 0.000 claims description 7
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention relates to a grounding electrode line fault simulation method and system, and belongs to the technical field of high voltage electricity. Firstly, determining a simulation test tower in a grounding electrode line; then installing an auxiliary test device on the simulation test tower; then installing a simulation test device; and installing a simulation lead, finally electrifying the line, and starting the grounding electrode line simulation test device to realize grounding electrode line grounding fault simulation. The grounding electrode line fault simulation system comprises an auxiliary test device consisting of an insulating support rod and a vertical lead, and a transmission module, a power module, an input module, a control module, a current detection and arc striking line operation module and the like. By the fault simulation method and the fault simulation system, accurate simulation of the grounding electrode line fault can be realized.
Description
Technical Field
The invention relates to a grounding electrode line fault simulation method and system, and belongs to the technical field of high voltage electricity.
Background
The direct current grounding electrode and the direct current grounding electrode circuit are important components of direct current transmission engineering, grounding electrode circuit fault simulation is carried out, whether a direct current control protection system can accurately act under a fault or not is checked, whether a fault distance measurement system can accurately measure a fault distance or not is checked, and the direct current grounding electrode circuit are the most important step in a direct current engineering debugging process. In traditional direct current earthing pole fault simulation, when needs are experimental, have a power failure to whole direct current circuit and direct current earthing pole circuit earlier, after having a power failure, hang test device, like short circuit test frame, in earthing pole circuit test position. And then, power transmission is recovered, and a grounded arc striking test wire is brought into the short circuit test frame by adopting an ejection device or a bow and crossbow device, so that fault simulation is formed, or a manual mode is adopted to simulate faults. No matter which of the two modes is adopted, power failure is needed, and the electric quantity transmitted by direct current transmission is large, so that large power failure loss is caused. Meanwhile, the protection of the direct current grounding electrode circuit is different from the protection of a direct current circuit, an alternating current circuit and the like, when the complaint mode is adopted, the duration time of the circuit fault is difficult to accurately grasp, and if the duration time is too short, the system judges that the system is disturbed, and the system is protected from action; if the duration is too long, the system judges that the system is in a permanent fault, the system is locked, and the power supply is stopped, so that the system is greatly adversely affected. How to simulate the fault of the grounding electrode line without power failure for a specified time to achieve the purpose of a test becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a grounding electrode line fault simulation method and system, which are used for solving the problems that the fault duration time cannot be accurately simulated during the fault simulation of a direct current grounding electrode, and the test efficiency and the normal operation of a power grid are influenced.
The technical scheme of the invention is as follows: a grounding electrode line fault simulation test method comprises the following specific steps:
step 1: determining a tower N of a grounding electrode line fault simulation test according to the fault range required by the dispatching, and acquiring the height Ht of a tower crosspiece and the length Lj of an insulator string through a tower diagram of the tower N;
step 2: installing an auxiliary L-shaped test device on the simulation test tower;
step 3: installing a grounding electrode circuit simulation test device;
step 4: installing a fault simulation lead, wherein one end of the fault simulation lead is connected to a tower grounding device, and the other end of the fault simulation lead is connected with an arc striking wire operating device of a simulation test device;
step 5: and (4) the circuit is electrified, and the grounding electrode circuit simulation test device is started to realize grounding electrode circuit grounding fault simulation.
Preferably, the tower N of the grounding electrode line fault simulation test in Step1 is a tension tower.
Preferably, when the auxiliary L-shaped test device is installed in Step2, the height H of the insulating support rod for supporting the auxiliary L-shaped test device to the ground is1The requirement of safe insulation to the ground is more than 3 m.
Preferably, when the auxiliary L-shaped test device is installed in Step2, the length of the down lead of the lead is L3，L3＝Ht-H1+ Δ 1+ Δ 2, Δ 1 is the length of the down conductor wound on the ground pole line, and Δ 2is the length of the down conductor wound on the insulating support rod, which is usually made of copper.
Preferably, before the Step 2is provided with the simulation test tower auxiliary L-shaped test device, an aluminum foil tape is adopted to perform winding protection on a grounding pole line, the length of the winding protection range meets 3-4 times of the diameter of a down lead of a lead, and the width is 10-20 cm.
Preferably, the length of the fault simulation lead determined in Step4 is L1；
Wherein k1 is a safety factor, the value range is 1.05-1.1, one end of the fault simulation lead is connected with the tower grounding device, and the other end of the fault simulation lead is used for realizing fault simulation through the fault simulation lead operation module;
the fault simulation lead is usually 1mm2-10mm2One end of the bare copper wire is connected with the tower grounding device, and the other end of the bare copper wire is connected with the arc leading line.
Preferably, the control method of the Step5 grounding electrode circuit simulation test device comprises the following steps:
step5.1: input protection currentSetting value Iset, time setting value Tset and height H of insulating support rod1；
Step5.2; the control module gives a signal to the power module, and the arc striking wire operating device starts to ascend through the transmission module;
step5.3: judging whether the rising height of the arc striking wire operating device exceeds the height H of the insulating support rod for supporting1；
Step5.4: if the rising height of the arc-guiding line operating device exceeds the height H of the insulating supporting rod for supporting1And if the control module gives a descending signal to the power module, the arc striking wire operating device starts to descend through the transmission module and returns to the initial position to give an abnormal signal, the position of the test device does not meet the requirement, and the test is finished.
Step5.5: if the rising height of the arc leading line operating device does not exceed the height of the insulating supporting rod for supporting, judging whether the current detected by the current detection module is less than 0.2Iset, and if the current detected by the current detection module is less than the height of the insulating supporting rod for supporting, continuing rising;
step5.6: if the current detected by the current detection module is greater than 0.2Iset, starting timing and maintaining the timing at the height;
step5.7: if the timing exceeds Tset, the control module gives a descending signal to the power module, the arc striking wire operating device starts to descend through the transmission module, the arc striking wire operating device returns to the initial position, a signal is given, the test is normal, and the test is finished.
Preferably, the connection of the down conductor to the insulating support rod for supporting and the dc ground electrode may be performed by a power cut operation or a live operation. When the live-wire work mode is adopted for carrying out, the road near the tension tower meets the work requirement of the 10kV insulating arm car.
A grounding electrode circuit fault simulation test system comprises a grounding electrode simulation test device and an L-shaped auxiliary test device;
the L-shaped auxiliary test device comprises an insulating support rod and a lead down wire, one end of the insulating support rod is connected with the tower, the other end of the insulating support rod is connected with the lead down wire, one end of the lead down wire is connected with the insulating support rod, and the other end of the lead down wire is connected with the grounding electrode lead;
the grounding electrode simulation test device comprises a transmission module, a power module, an input module, a control module, a current detection module and an arc striking wire operation module;
a transmission module: the device is used for transmitting power to the arc leading line operation module, so that the arc leading line can be converted into an L-shaped auxiliary test device from the ground, and the simulation of the ground fault is realized;
a power module: the control module is used for receiving the control of the control module and the input module and providing power for the transmission module;
an input module: used for receiving relevant information of test input, including input protection current setting value Iset, time setting value Tset and height H of insulating support rod1；
A control module: the direct current grounding electrode circuit is used for controlling the arc striking wire operation module to enable the contact time of the arc striking wire operation module and the direct current grounding electrode circuit to be a time setting value Tset;
leading an arc line operation module: the arc striking wire operation module is usually insulated, one end of the arc striking wire operation module is connected with the arc striking wire, the other end of the arc striking wire operation module is connected with the power module, and the S-shaped copper sheet is connected with the arc striking wire through a bolt;
and the current detection module is used for detecting the current flowing through the leading arc line and judging whether the fault simulation is realized for the control module.
The invention has the beneficial effects that: the problem that time and current are difficult to control in the short circuit process of the direct current grounding electrode circuit is solved, and the success rate of a grounding electrode short circuit test is improved.
Drawings
FIG. 1 is a schematic diagram of a direct pole line fault system of the present invention;
FIG. 2is a control flow chart of the testing apparatus of the present invention.
In the figure: 1-down lead of wire, 2-insulating support rod, 3-fault simulation lead, 4-arc-striking operation device and 5-S type copper sheet
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1: as shown in fig. 1-2, a method for simulating and testing a fault of a grounding electrode line includes the following steps:
step 1: determining a tower N of a grounding electrode line fault simulation test according to a fault range required by scheduling, acquiring a tower crosspiece height Ht and an insulator string length Lj through a tower diagram of the tower N, selecting a 1 st base tower outside a converter station as a tension tower by the simulation test tower according to the scheduling requirement, and obtaining the crosspiece height Ht of 18m and the insulator string length Lj of 0.73m according to a drawing of the base tower.
Step 2: an auxiliary L-shaped test device is arranged on a simulation test tower, and the position of an insulating support rod 2 for supporting is opposite to the ground height H1The ground safety insulation is more than 3m, and 4m is selected according to the tower drawing in the first step; the winding length on the grounding pole line is 0.5m, the winding length on the insulating support rod 2is 0.2m, the length L3 of the lead down wire 1 is 4.7m, the lead down wire 1 is a copper wire with a transparent outer sheath, and the sectional area is 25mm2L3 is Ht-H1+ Δ 1+ Δ 2, Δ 1 is the length of the lead down 1 wound on the ground line, Δ 2is the length of the lead down 1 wound on the insulating support rod 2, the lead down 1 is usually made of copper, and before the auxiliary L-shaped test device is installed, an aluminum foil tape is installed on the ground line for protection, and the width is 15 cm. The installation mode is power failure installation.
Step 3: installing a grounding electrode circuit simulation test device; this earthing pole analogue test device includes: the device comprises a transmission module, a power module, an input module, a control module, a current detection module and an arc striking wire operation module;
a transmission module: the device is used for transmitting power to the arc leading line operation module, so that the arc leading line can be converted into an L-shaped auxiliary test device from the ground, and the simulation of the ground fault is realized;
a power module: for receiving control of the control module and the input module and providing power to the transmission module
An input module: for receiving test input-related information including input protection current setting Iset, time setting Tset and height H1；
The control module is used for controlling the arc striking line operation module so that the contact time of the arc striking line operation module and the direct current grounding electrode circuit is a time setting value Tset;
draw pitch arc line operating module, draw pitch arc line to earthing pole circuit, form artifical simulation ground connection, the pitch arc line operating module 4 is insulating usually, and one end is connected and is drawn the pitch arc line, and this end is S type copper sheet 5, links to each other with the pitch arc line through the bolt, and power module is connected to one end in addition.
The current detection module is used for detecting the current flowing through the leading arc line and judging whether fault simulation is realized or not for the control module;
step 4: installing a fault simulation lead 3, wherein one end of the fault simulation lead 3 is connected to a tower grounding device, and the other end of the fault simulation lead 3 is connected with an arc striking wire operating device 4 of a simulation test device; the length of the arc of approach line L1,
k1 is a safety coefficient, the value is 1.1, one end of an arc striking wire is connected with a tower grounding device, and the other end of the arc striking wire realizes fault simulation through an arc striking wire operation module; the cross-sectional area of the striking arc wire is 2mm2One end of the tower is connected with the tower grounding device, and the other end of the tower grounding device is connected with the arc leading line.
Step 5: and (4) the circuit is electrified, and the grounding electrode circuit simulation test device is started to realize grounding electrode circuit grounding fault simulation.
In the process of starting the grounding electrode circuit simulation test device at Step5, the method further comprises the following steps
Step5.1: inputting a protection current setting value Iset, 1000A, a time setting value Tset,0.2S and a height H1,4 m;
step5.2; the control module gives a signal to the power module, and the arc striking wire operating device 4 starts to ascend through the transmission module;
step5.3: judging whether the rising height of the arc leading line operating device 4 exceeds the height of the insulating support rod 2 for supporting;
step5.4: if the arc-guiding line operating device 4 rises to a height exceeding the height H of the supporting insulating support rod 21Then the control module gives the power moduleAnd (3) a descending signal, the arc leading line operating device 4 starts to descend through the transmission module, returns to the initial position, gives an abnormal signal, and ends the test when the position of the test device does not meet the requirement.
Step5.5: if the rising height of the arc guiding line operating device 4 does not exceed the height of the insulating supporting rod 2 for supporting, judging whether the current detected by the current detection module is less than 0.2Iset, if so, continuing rising;
step5.6: if the current detected by the current detection module is greater than 0.2Iset, starting timing and maintaining the timing at the height;
step5.4, if the timing exceeds Tset, the control module gives a descending signal to the power module, the arc-leading line operating device 4 starts to descend through the transmission module, the initial position is returned, a signal is given, the test is normal, and the test is finished.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (7)
1. A grounding electrode line fault simulation test method is characterized in that:
step 1: determining a tower N of a grounding electrode line fault simulation test according to the fault range required by the dispatching, and acquiring the height Ht of a tower crosspiece and the length Lj of an insulator string through a tower diagram of the tower N;
step 2: installing an auxiliary L-shaped test device on the simulation test tower;
step 3: installing a grounding electrode circuit simulation test device;
step 4: installing a fault simulation lead, wherein one end of the fault simulation lead is connected to a tower grounding device, and the other end of the fault simulation lead is connected with an arc striking wire operating device of a simulation test device;
step 5: the circuit is electrified, and the grounding electrode circuit simulation test device is started to realize grounding electrode circuit grounding fault simulation;
the control method of the Step5 grounding electrode circuit simulation test device comprises the following steps:
step5.1: inputting a protective current setting Iset and a time setting Tset and the height H of the insulating support rod1；
Step5.2; the control module gives a signal to the power module, and the arc striking wire operating device starts to ascend through the transmission module;
step5.3: judging whether the rising height of the arc striking wire operating device exceeds the height H of the insulating support rod for supporting1；
Step5.4: if the rising height of the arc-guiding line operating device exceeds the height H of the insulating supporting rod for supporting1If the arc striking wire operation device does not meet the requirement, the control module gives a descending signal to the power module, the arc striking wire operation device starts to descend through the transmission module and returns to the initial position to give an abnormal signal, and the test device is positioned to be out of line with the requirement, so that the test is finished;
step5.5: if the rising height of the arc leading line operating device does not exceed the height of the insulating supporting rod for supporting, judging whether the current detected by the current detection module is less than 0.2Iset, and if the current detected by the current detection module is less than the height of the insulating supporting rod for supporting, continuing rising;
step5.6: if the current detected by the current detection module is greater than 0.2Iset, starting timing and maintaining the timing at the height;
step5.7: if the timing exceeds Tset, the control module gives a descending signal to the power module, the arc striking wire operating device starts to descend through the transmission module, the arc striking wire operating device returns to the initial position, a signal is given, the test is normal, and the test is finished.
2. The earth electrode line fault simulation test method of claim 1, characterized in that: and the tower N of the grounding electrode line fault simulation test in Step1 is a strain tower.
3. The earth electrode line fault simulation test method of claim 1, characterized in that: when the auxiliary L-shaped test device is installed in the Step2, the height H of the insulating support rod for supporting the auxiliary L-shaped test device1The requirement of safe insulation to the ground is more than 3 m.
4. According to the claimsThe grounding electrode line fault simulation test method of claim 1 is characterized in that: when the auxiliary L-shaped test device is installed in the Step2, the length of the lead down wire of the lead is L3，L3＝Ht-H1+ Δ 1+ Δ 2, Δ 1 is the length that the lead downlead twined on the ground polar line, and Δ 2is the length that the lead downlead twined on the insulating support rod, the lead downlead be copper material.
5. The earth electrode line fault simulation test method of claim 4, characterized in that: before the simulation test tower auxiliary L-shaped test device is installed in Step2, an aluminum foil tape is adopted to perform winding protection on a grounding polar line, the length of the winding protection range meets 3-4 times of the diameter of a down lead of a lead, and the width of the winding protection range is 10-20 cm.
6. The earth electrode line fault simulation test method of claim 1, characterized in that: determining the length of the fault simulation lead wire to be L in Step41；
Wherein k1 is a safety factor, the value range is 1.05-1.1, one end of the fault simulation lead is connected with the tower grounding device, and the other end of the fault simulation lead is used for realizing fault simulation through the fault simulation lead operation module;
the fault simulation lead is 1mm2-10mm2One end of the bare copper wire is connected with the tower grounding device, and the other end of the bare copper wire is connected with the arc leading line.
7. The utility model provides an earthing pole circuit fault analogue test system which characterized in that: the device comprises a grounding electrode simulation test device and an L-shaped auxiliary test device;
the L-shaped auxiliary test device comprises an insulating support rod and a lead down wire, one end of the insulating support rod is connected with the tower, the other end of the insulating support rod is connected with the lead down wire, one end of the lead down wire is connected with the insulating support rod, and the other end of the lead down wire is connected with the grounding electrode lead;
the grounding electrode simulation test device comprises a transmission module, a power module, an input module, a control module, a current detection module and an arc striking wire operation module;
a transmission module: the device is used for transmitting power to the arc leading line operation module, so that the arc leading line can be converted into an L-shaped auxiliary test device from the ground, and the simulation of the ground fault is realized;
a power module: the control module is used for receiving the control of the control module and the input module and providing power for the transmission module;
an input module: used for receiving relevant information of test input, including input protection current setting value Iset, time setting value Tset and height H of insulating support rod1；
A control module: the direct current grounding electrode circuit is used for controlling the arc striking wire operation module to enable the contact time of the arc striking wire operation module and the direct current grounding electrode circuit to be a time setting value Tset;
leading an arc line operation module: the arc striking wire operation module is insulated, one end of the arc striking wire operation module is connected with the arc striking wire, the other end of the arc striking wire operation module is connected with the power module, and the S-shaped copper sheet is connected with the arc striking wire through a bolt;
and the current detection module is used for detecting the current flowing through the leading arc line and judging whether the fault simulation is realized for the control module.
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