CN113848521A - Automatic tracking arc suppression coil field checking and fault handling test method - Google Patents
Automatic tracking arc suppression coil field checking and fault handling test method Download PDFInfo
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- CN113848521A CN113848521A CN202010594174.0A CN202010594174A CN113848521A CN 113848521 A CN113848521 A CN 113848521A CN 202010594174 A CN202010594174 A CN 202010594174A CN 113848521 A CN113848521 A CN 113848521A
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Abstract
A test method for on-site checking and fault processing of automatic tracking arc suppression coil is to form a test device by a disconnecting link, a switch, a three-phase earth capacitor and a grounding element, to connect the test device to the power grid at a transformer substation or a feeder, to connect the test device to the power grid through the switch after the automatic tracking arc suppression coil in the power grid completes the measurement and induction adjustment of capacitance current, to form the change of the power grid operation mode, or to generate various single-phase grounding faults, to check the correctness of the measurement and induction adjustment of the capacitance current by the automatic tracking arc suppression coil, and to check the fault processing effect of the automatic tracking arc suppression coil and the grounding line selection device.
Description
Technical Field
The invention relates to a field checking and fault handling test method for an automatic tracking arc suppression coil, which is mainly used for the field checking and fault handling test of the automatic tracking arc suppression coil.
Background
The automatic arc extinction device and the grounding line selection device of the power distribution network are products which are applied to a power grid very much, and the products have a decisive effect on eliminating transient faults and improving power supply reliability. However, the experiments on the automatic arc extinction device and the grounding wire selection device are generally that some functional tests and insulation tests are performed in a factory, and the functions of the automatic arc extinction device and the grounding wire selection device cannot be tested due to the lack of due test means on the site, so that the functions of the automatic arc extinction device and the grounding wire selection device cannot be mastered in time. Such as the measurement precision of the automatic arc suppression coil to the electric network capacitance current, the compensation current adjustment of the arc suppression coil, residual current control, automatic tracking function and whether the line selection of the grounding line selection device is correct or not lack necessary test verification. After the automatic arc extinction device and the grounding line selection device of the power distribution network are installed on site or after the power distribution network runs for a certain period, due to the reasons of transportation and installation and the reason of drift of the working point of an electronic element, the logic function of the device can be changed, and even more, the secondary circuit can cause the neutral grounding device of the power distribution network to be incapable of working due to wrong connection.
The accuracy of the ground selection of the arc suppression coil compensation power grid, particularly the accuracy of the high-resistance ground selection, is a technical problem which is difficult to solve, but because the frequent disconnection and ground faults of insulated wires in the power grid pose great threat to personal safety, the accuracy of the ground selection of the arc suppression coil compensation power grid is an important problem which must be concerned about, and therefore, it is necessary to find a test method which is suitable for carrying out automatic tracking arc suppression coil field check and fault treatment on an automatic arc suppression device and a ground selection device on the spot.
Disclosure of Invention
Aiming at the problems, the invention provides a test device consisting of a disconnecting link, a switch, a three-phase grounding capacitor and a grounding element, the test device can be arranged on a vehicle to form a test vehicle, the test device is connected into a power grid at a transformer substation or a feeder line, and after an automatic tracking arc suppression coil in the power grid finishes capacitance current measurement and induction adjustment, a power grid capacitance current value I measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow control value Iδ1And the working position of the tuning mechanism, and then the testing device is put into a ground capacitance current I through a switchCδThe three-phase grounding capacitor records the measured value of the automatic tracking arc suppression coil to the capacitance current, observes and records whether the tuning mechanism of the automatic tracking arc suppression coil works correctly or not, and records the power grid capacitance current value I measured by the automatic tracking arc suppression coilC2Compensating current value IL2Neutral point shift voltage UN2Residual flow control value Iδ2And calculating the measurement error of the electric network capacitance current of the automatic tracking arc suppression coil: gamma = [ (I)C2-IC1)- ICδ]/ ICδ100%, and the residual flow value Iδ2And neutral point displacement voltage UN2Whether the requirements are met; adjusting the three-phase earth capacitance current of the test device to the capacitance current value I of the feeder line with the minimum capacitance currentC0mAnd repeating the tests to check the minimum tracking sensitivity of the automatic tracking arc suppression coil and the measurement error when the capacitance current is tracked at the minimum.
An insulator for connecting any phase of the secondary side of the switch of the test device to the groundThe side of the insulator is connected with an arc fuse in parallel to the ground, and after the automatic tracking arc suppression coil in the power grid finishes capacitance current measurement and induction adjustment, the capacitance current value I of the power grid measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow value Iδ1And after the working position of the tuning mechanism, switching on the test device through a switch, putting the test device into a grounded insulator, striking an arc through a fuse to form a transient grounding fault, checking whether an automatic tracking arc suppression coil is reliably extinguished, observing an arc suppression process, and recording the longest arc suppression time.
Any communicated transition resistor on the secondary side of the switch of the test device is grounded, and after the automatic tracking arc suppression coil in the power grid finishes capacitance current measurement and inductance adjustment, the capacitance current value I of the power grid measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow control value Iδ1After the tuning mechanism operates, switching in the transition resistor for grounding through a switch, and recording a three-phase voltage of a power grid, a shift voltage of a neutral point, a compensation current of an arc suppression coil and a fault line selected by a grounding line selection device in the power grid; and replacing the grounding resistance value of the switching test device, and repeating the test until the grounding line selection device can not select a correct line, so as to obtain the identification capability of the grounding line selection device in the arc suppression coil compensation power grid on high-resistance grounding.
Connecting any phase of a switch secondary side of a test device into a grounding insulated wire with a core wire exposed length of a certain value, setting the ground of a grounding point of the insulated wire into a sandy soil ground in a wet state, a sandy soil ground in a dry state, a cement ground in a wet state, a cement ground in a dry state, a leachate ground in a wet state and a leachate ground in a dry and wet state, switching into a grounding insulated wire grounding fault through a switch after an automatic tracking arc suppression coil in a power grid completes capacitance current measurement and inductance adjustment, and recording three-phase voltage, neutral point displacement voltage and a fault line selected by a grounding line selection device in the power grid; replacing the exposed length of the core wire of the grounding insulated wire and repeating the test; the above test is repeated when the ground state of the ground insulated conductor is changed, and the influence of various broken wire grounding conditions on the grounding wire selection accuracy of the grounding wire selection device and the influence of fault points on personal safety are examined when the arc suppression coil is in a grounding mode.
When the automatic tracking arc suppression coil finishes the capacitance current measurement error correction test, the requirement C of the three-phase earth capacitor is requiredA=CB=CC=C01Namely, the capacitance current to ground of one feeder line is equivalent; capacitor C in minimum tracking sensitivity test of automatic tracking arc suppression coilA=CB=CC=C0mI.e. the capacitance to ground corresponding to the minimum capacitance to ground current feeder.
The invention has the following advantages:
1. the method comprises the steps that a disconnecting link, a switch, a three-phase grounding capacitor and a grounding element mate form a test device, a test device can be mounted on a vehicle to form a test vehicle, the test device is connected into a power grid at a transformer substation or a feeder line, and the test device can be connected into the power grid without power outage, so that the connection is convenient and the operability is strong.
2. The method is characterized in that a test device is used for inputting or withdrawing the three-phase ground capacitor, and the measurement error and the minimum tracking sensitivity of the automatic tracking arc suppression coil to the capacitance current of the power grid can be conveniently, directly and accurately calibrated by utilizing the input or withdrawn known capacitance current value.
3. The method has the advantages that the three-phase ground capacitor is switched in or out by the test device, the power supply reliability can be guaranteed compared with the switching feeder, and whether the tuning mechanism of the automatic tracking arc suppression coil works correctly and whether the compensation current and residual current control is proper can be directly checked in the test process.
4. The invention adopts the side of the insulator to ground parallel arc-striking fuses to form the transient grounding fault, examines the arc extinction treatment of the automatic tracking arc-extinction coil to the transient grounding fault, can conveniently obtain the arc extinction time of the automatic tracking arc-extinction coil to the transient grounding fault, and provides a basis for the reconstruction and scientific research of the automatic tracking arc-extinction coil.
5. The permanent grounding fault is formed by connecting the transition resistor, so that the identification capability of the grounding line selection device in the arc suppression coil compensation power grid for high-resistance grounding can be conveniently obtained.
6. The invention adopts the grounding insulated conductor with the exposed length of the core wire as a certain value, the ground of the grounding point of the insulated conductor is set to be the sandy soil ground in a wet state, the sandy soil ground in a dry state, the cement ground in a wet state, the cement ground in a dry state, the asphalt ground in a wet state and the asphalt ground in a dry and wet state to generate the disconnection grounding fault of the insulated conductor, and the influence of various disconnection grounding working conditions on the grounding selection accuracy of the grounding selection device and the fault point on the personal safety in the grounding mode of the arc suppression coil is examined.
Drawings
FIG. 1 is a wiring diagram of automatic tracking arc suppression coil for checking the measurement of the capacitance and current of the power grid and automatic tracking trial control, wherein the capacitor requires CA=CB=CC. Corresponding to the capacitance-to-ground current of one feeder.
Fig. 2 is a wiring diagram for transient fault handling tests.
Fig. 3 is a wiring diagram for transition resistance ground fault processing test.
Fig. 4 is a wiring diagram of a broken wire grounding fault processing test.
Detailed Description
The testing device is connected to the electric network at the transformer substation or feeder line, and after the automatic tracking arc suppression coil in the electric network completes the measurement and induction adjustment of capacitance current, the electric network capacitance current value I measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow value Iδ1And the working position of the tuning mechanism, and then the testing device is put into a ground capacitance current I through a switchCδThe three-phase grounding capacitor records the measured value of the automatic tracking arc suppression coil to the capacitance current, observes and records whether the tuning mechanism of the automatic tracking arc suppression coil works correctly or not, and records the power grid capacitance current value I measured by the automatic tracking arc suppression coilC2Compensating current value IL2Neutral point shift voltage UN2Residual flow value Iδ2And calculating the measurement error of the electric network capacitance current of the automatic tracking arc suppression coil: gamma ray=[(IC2-IC1)- ICδ]/ ICδ100%, and the residual flow value Iδ2And neutral point displacement voltage UN2Whether the requirements are met; adjusting the three-phase earth capacitance current of the test device to the capacitance current value I of the feeder line with the minimum capacitance currentC0mAnd repeating the tests to check the minimum tracking sensitivity of the automatic tracking arc suppression coil and the measurement error when the capacitance current is tracked at the minimum.
Connecting any phase of the secondary side of the switch of the test device to an insulator which is grounded, connecting an arc-striking fuse in parallel beside the insulator to the ground, and recording the capacitance current value I of the power grid measured by an automatic tracking arc-extinguishing coil after the automatic tracking arc-extinguishing coil in the power grid finishes capacitance current measurement and inductance adjustmentC1Compensating current value IL1Neutral point shift voltage UN1Residual flow value Iδ1And after the working position of the tuning mechanism, switching on the test device through a switch, putting the test device into a grounded insulator, striking an arc through a fuse to form a transient grounding fault, checking whether an automatic tracking arc suppression coil is reliably extinguished, observing an arc suppression process, and recording the longest arc suppression time.
Any communicated transition resistor on the secondary side of the switch of the test device is grounded, and after the automatic tracking arc suppression coil in the power grid finishes capacitance current measurement and inductance adjustment, the capacitance current value I of the power grid measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow control value Iδ1After the tuning mechanism operates, switching in the transition resistor for grounding through a switch, and recording a three-phase voltage of a power grid, a shift voltage of a neutral point, a compensation current of an arc suppression coil and a fault line selected by a grounding line selection device in the power grid; and replacing the grounding resistance value of the switching test device, and repeating the test until the grounding line selection device can not select a correct line, so as to obtain the identification capability of the grounding line selection device in the arc suppression coil compensation power grid on high-resistance grounding.
Connecting any phase of a switch secondary side of a test device into a grounding insulated wire with a core wire exposed length of a certain value, setting the ground of a grounding point of the insulated wire into a sandy soil ground in a wet state, a sandy soil ground in a dry state, a cement ground in a wet state, a cement ground in a dry state, a leachate ground in a wet state and a leachate ground in a dry and wet state, switching into a grounding insulated wire grounding fault through a switch after an automatic tracking arc suppression coil in a power grid completes capacitance current measurement and inductance adjustment, and recording three-phase voltage, neutral point displacement voltage and a fault line selected by a grounding line selection device in the power grid; replacing the exposed length of the core wire of the grounding insulated wire and repeating the test; the above test is repeated when the ground state of the ground insulated conductor is changed, and the influence of various broken wire grounding conditions on the grounding wire selection accuracy of the grounding wire selection device and the influence of fault points on personal safety are examined when the arc suppression coil is in a grounding mode.
When the automatic tracking arc suppression coil finishes the capacitance current measurement error correction test, the requirement C of the three-phase earth capacitor is requiredA=CB=CC=C01Namely, the capacitance current to ground of one feeder line is equivalent; capacitor C in minimum tracking sensitivity test of automatic tracking arc suppression coilA=CB=CC=C0mI.e. the capacitance to ground corresponding to the minimum capacitance to ground current feeder.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.
Claims (2)
1. An automatic tracking arc suppression coil field check and fault processing test method is characterized in that: the testing device is installed on a vehicle to form a testing vehicle, the testing device is connected to a power grid at a transformer substation or a feeder line, and after an automatic tracking arc suppression coil in the power grid finishes capacitance current measurement and inductance adjustment, the capacitance current value I of the power grid measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow ofControl value Iδ1And the working position of the tuning mechanism, and then the testing device is put into a ground capacitance current I through a switchCδThe three-phase grounding capacitor records the measured value of the automatic tracking arc suppression coil to the capacitance current, observes and records whether the tuning mechanism of the automatic tracking arc suppression coil works correctly or not, and records the power grid capacitance current value I measured by the automatic tracking arc suppression coilC2Compensating current value IL2Neutral point shift voltage UN2Residual flow control value Iδ2Calculating the measurement error gamma = [ (I) of the electric network capacitance current of the automatic tracking arc suppression coilC2-IC1)- ICδ]/ ICδ100%, and the residual flow value Iδ2And neutral point displacement voltage UN2Whether the requirements are met; adjusting the three-phase earth capacitance current of the test device to the capacitance current value I of the feeder line with the minimum capacitance currentC0mRepeating the above tests, and checking the minimum tracking sensitivity of the automatic tracking arc suppression coil and the measurement error when the capacitance current is tracked to the minimum;
connecting any phase of the secondary side of the switch of the test device to an insulator which is grounded, connecting an arc-striking fuse in parallel beside the insulator to the ground, and recording the capacitance current value I of the power grid measured by an automatic tracking arc-extinguishing coil after the automatic tracking arc-extinguishing coil in the power grid finishes capacitance current measurement and inductance adjustmentC1Compensating current value IL1Neutral point shift voltage UN1Residual flow value Iδ1After the working position of the tuning mechanism, switching on the test device through a switch, putting the test device into a grounded insulator, forming a transient grounding fault by arc striking of a fuse, checking whether an automatic tracking arc suppression coil is reliably arc suppressed, observing an arc suppression process, and recording the longest arc suppression time;
any communicated transition resistor on the secondary side of the switch of the test device is grounded, and after the automatic tracking arc suppression coil in the power grid finishes capacitance current measurement and inductance adjustment, the capacitance current value I of the power grid measured by the automatic tracking arc suppression coil is recordedC1Compensating current value IL1Neutral point shift voltage UN1Residual flow control value Iδ1After the tuning mechanism operates, the transition resistor is put into grounding through switch closing, and the three-phase voltage and the neutral point position of the power grid are recordedVoltage shifting, arc suppression coil compensation current and a fault line selected by a grounding line selection device in a power grid; replacing the grounding resistance value of the switching test device, repeating the test until the grounding line selection device can not select a correct line, and obtaining the identification capability of the grounding line selection device in the arc suppression coil compensation power grid on high-resistance grounding;
connecting any phase of a switch secondary side of a test device into a grounding insulated wire with a core wire exposed length of a certain value, setting the ground of a grounding point of the insulated wire into a sandy soil ground in a wet state, a sandy soil ground in a dry state, a cement ground in a wet state, a cement ground in a dry state, a leachate ground in a wet state and a leachate ground in a dry and wet state, switching into a grounding insulated wire grounding fault through a switch after an automatic tracking arc suppression coil in a power grid completes capacitance current measurement and inductance adjustment, and recording three-phase voltage, neutral point displacement voltage and a fault line selected by a grounding line selection device in the power grid; replacing the exposed length of the core wire of the grounding insulated wire and repeating the test; the above test is repeated when the ground state of the ground insulated conductor is changed, and the influence of various broken wire grounding conditions on the grounding wire selection accuracy of the grounding wire selection device and the influence of fault points on personal safety are examined when the arc suppression coil is in a grounding mode.
2. The on-site checking and fault handling test method for the automatic tracking arc suppression coil according to claim 1, characterized in that: when the automatic tracking arc suppression coil finishes the capacitance current measurement error correction test, the requirement C of the three-phase earth capacitor is requiredA=CB=CC=C01Namely, the capacitance current to ground of one feeder line is equivalent; capacitor C in minimum tracking sensitivity test of automatic tracking arc suppression coilA=CB=CC=C0mI.e. the capacitance to ground corresponding to the minimum capacitance to ground current feeder.
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