CN111426916A - Grounding electrode line fault simulation method and system - Google Patents
Grounding electrode line fault simulation method and system Download PDFInfo
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- CN111426916A CN111426916A CN202010408095.6A CN202010408095A CN111426916A CN 111426916 A CN111426916 A CN 111426916A CN 202010408095 A CN202010408095 A CN 202010408095A CN 111426916 A CN111426916 A CN 111426916A
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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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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
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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:
step1, determining a tower N of the 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 L j of an insulator string through a tower diagram of the tower N;
step2, mounting an auxiliary L type 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 type test device is installed in the Step2, the insulating support rod for supporting the test device is positioned at the height H relative to the ground1The requirement of safe insulation to the ground is more than 3 m.
Preferably, when the auxiliary L type 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 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 auxiliary L type test device of the simulation test tower, an aluminum foil tape is adopted to perform winding protection on a grounding pole line, the protection range meets the requirement that the diameter of a vertical lead is 3-4 times, and the width is not less than 10cm-20 cm.
Preferably, the length of the leading arc line determined in Step4 is L1；
Wherein k1 is a safety factor, the value range is 1.05-1.1, one end of the arc striking wire is connected with the tower grounding device, and the other end of the arc striking wire realizes fault simulation through the arc striking wire operation module;
the arc striking wire 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: inputting a protection current setting value Iset, a time setting value Tset and a height H1;
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 of the insulating support rod for supporting or not;
step5.4: if the rising height of the arc striking line operating device exceeds the height H1 of the insulating support rod for supporting, the control module gives a descending signal to the power module, the arc striking line operating device starts to descend through the transmission module, returns to the initial position and gives 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 type auxiliary test device;
the L type auxiliary test device comprises an insulating support rod and a vertical lead, wherein one end of the insulating support rod is connected with a tower, the other end of the insulating support rod is connected with the vertical lead, one end of the vertical lead is connected with the insulating support rod, and the other end of the vertical lead is connected with a ground 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;
the transmission module is used for transmitting power to the arc leading line operation module, so that the arc leading line can be converted from the ground to an L type auxiliary test device, 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: the device is used for receiving relevant information of test input, including an input protection current setting value Iset, a time setting value Tset and a height H1;
a control module: the control module is used for controlling the arc striking line operation module to enable the arc striking line operation module to be in contact with the direct-current grounding polar line for a corresponding time;
leading an arc line operation module: the arc striking wire operating device is usually insulated, one end of the arc striking wire operating device is connected with the arc striking wire, the other end of the arc striking wire operating device is connected with a power device, 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:
step1, determining a tower N of the grounding electrode line fault simulation test according to the fault range required by the dispatching, obtaining the height Ht of a tower crosspiece and the length of the insulator string L j through the tower image of the tower N, selecting the 1 st base tower outside the converter station as a tension tower according to the dispatching requirement, obtaining the height Ht of the crosspiece as 18m according to the drawing of the base tower, and obtaining the length of the insulator string L j as 0.73 m.
Step2, installing an auxiliary L type test device on a simulation test tower, wherein the height H1 of the position of an insulating support rod 2 for supporting to the ground meets the requirement that the ground safety insulation is more than 3m, according to the tower drawing of the first Step, the height is selected to be 4m, the winding length on a grounding pole line is 0.5m, the winding length on the insulating support rod 2is 0.2m, the length L3 of a lead down lead 1 is 4.7m, the lead down lead 1 is a copper wire with a transparent outer sheath, and the cross section area is 25mm2L3 is H-H1 + Δ 1+ Δ 2, Δ 1 is the length of the lead down 1 wound on the ground polar 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, before the auxiliary L test device is installed, an aluminum tape is installed on the ground polar line for protection, and the installation mode of the width 15 cm. is power cut 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;
the transmission module is used for transmitting power to the arc leading line operation module, so that the arc leading line can be converted from the ground to an L type auxiliary test device, 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: the device is used for receiving relevant information of test input, including an input protection current setting value Iset, a time setting value Tset and a height H1;
a control module for controlling the arc striking line operation module to make the arc striking line operation module contact with the DC ground polar line for a corresponding time
And the arc leading line operating module is used for pulling the arc leading line to the grounding electrode circuit to form artificial simulation grounding, the arc leading line operating device 4 is usually insulated, one end of the arc leading line operating device is connected with the arc leading line, the end of the arc leading line operating device is an S-shaped copper sheet 5 and is connected with the arc leading line through a bolt, and the other end of the arc leading line operating device is connected with a power device.
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;
step4, installing a fault simulation lead 3, connecting one end of the fault simulation lead 3 to a tower grounding device, connecting the other end of the fault simulation lead 3 to an arc striking wire operating device 4 of a simulation test device, connecting the length of an arc striking wire 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 rising height of the arc guiding line operating device 4 exceeds the height H1 of the insulating support rod 2 for supporting, the control module gives a descending signal to the power module, the arc guiding line operating device 4 starts to descend through the transmission module, the initial position is returned, an abnormal signal is given, 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 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 (8)
1. A grounding electrode line fault simulation test method is characterized in that:
step1, determining a tower N of the 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 L j of an insulator string through a tower diagram of the tower N;
step2, mounting an auxiliary L type 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.
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 method of claim 1, wherein when the auxiliary L test device is installed in Step2, the position of the insulating support rod for supporting the device is higher than the ground height H1The requirement of safe insulation to the ground is more than 3 m.
4. The method of claim 1, wherein when the auxiliary L 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 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 grounding electrode line fault simulation test method of claim 1, wherein before the Step 2is provided with the simulation test tower auxiliary L type test device, an aluminum foil tape is adopted on a grounding electrode line for winding protection, the protection range meets 3-4 times of the diameter of a vertical lead, and the width is not less than 10cm-20 cm.
6. The grounding electrode line fault simulation test method of claim 1, wherein the length of the leading arc line determined in Step4 is L1；
Wherein k1 is a safety factor, the value range is 1.05-1.1, one end of the arc striking wire is connected with the tower grounding device, and the other end of the arc striking wire realizes fault simulation through the arc striking wire operation module;
the arc leading line 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 earth electrode line fault simulation test method of claim 1, characterized in that: the control method of the Step5 grounding electrode circuit simulation test device comprises the following steps:
step5.1: inputting a protection current setting value Iset, a time setting value Tset and a height H1;
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 of the insulating support rod for supporting or not;
step5.4: if the rising height of the arc striking line operating device exceeds the height H1 of the insulating support rod for supporting, the control module gives a descending signal to the power module, the arc striking line operating device starts to descend through the transmission module, returns to the initial position and gives 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.
8. A grounding electrode circuit fault simulation test system is characterized by comprising a grounding electrode simulation test device and an L type auxiliary test device;
the L type auxiliary test device comprises an insulating support rod and a vertical lead, wherein one end of the insulating support rod is connected with a tower, the other end of the insulating support rod is connected with the vertical lead, one end of the vertical lead is connected with the insulating support rod, and the other end of the vertical lead is connected with a ground 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;
the transmission module is used for transmitting power to the arc leading line operation module, so that the arc leading line can be converted from the ground to an L type auxiliary test device, 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: the device is used for receiving relevant information of test input, including an input protection current setting value Iset, a time setting value Tset and a height H1;
a control module: the control module is used for controlling the arc striking line operation module to enable the arc striking line operation module to be in contact with the direct-current grounding polar line for a corresponding time;
leading an arc line operation module: the arc striking wire operating device is insulated, one end of the arc striking wire operating device is connected with the arc striking wire, the other end of the arc striking wire operating device is connected with the power device, 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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