CN110146763B - Arc suppression coil parallel low-resistance grounding device test method and device and storage medium - Google Patents
Arc suppression coil parallel low-resistance grounding device test method and device and storage medium Download PDFInfo
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Abstract
The invention discloses a test method, a test device and a storage medium for an arc suppression coil parallel low-resistance grounding device, wherein the method comprises the following steps: controlling the first switch module, the second switch module and the third switch module to carry out switching for N times so as to simulate single-time single-phase metal grounding fault impedance grounding fault and arc grounding fault; acquiring a low-resistance switching parameter during any one ground fault as a first test parameter; wherein, low resistance switching parameter includes: neutral point-to-ground voltage when the low-resistance grounding resistor is not switched in, compensation current and grounding point current output by the arc suppression coil, current of the low-resistance grounding resistor when the low-resistance grounding resistor is switched in, and cutting-off time of the low-resistance grounding resistor; when the first test parameter meets the preset single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the single-phase grounding fault test; the method can verify the reliability of the arc suppression coil parallel low-resistance grounding device.
Description
Technical Field
The invention relates to the technical field of arc suppression coil parallel low-resistance grounding, in particular to a test method and test equipment for an arc suppression coil parallel low-resistance grounding device and a storage medium.
Background
In the power system, the neutral grounding mode is selected according to the insulation level of the power grid equipment and the magnitude of the capacitance current. For a power distribution network mainly comprising an overhead line, a neutral point is grounded through an arc suppression coil; for an urban power distribution network mainly based on cable lines, the single-phase earth fault has large capacitance and current, and a mode that a neutral point is grounded through a small resistor is mostly adopted. However, the neutral point is grounded through an arc suppression coil, which brings certain difficulty to permanent fault line selection and is difficult to rapidly and accurately remove faults; the neutral point can not distinguish instantaneous earth faults from permanent earth faults in a small-resistance earthing mode, and line tripping is started for all single-phase earthing, so that the line tripping times are increased, and the power supply reliability is influenced. The flexible grounding mode of connecting the arc suppression coil with the small resistor in parallel can be combined with the advantages of eliminating transient faults and quickly isolating permanent faults by the arc suppression coil, the problems of the arc suppression coil and the small resistor are solved, and the power supply safety and reliability of the power distribution network are greatly improved. At present, the flexible grounding control device with arc suppression coils connected with small resistors in parallel is developed successfully, is tried out in China generally, and achieves a good effect.
At present, the working principle of the arc suppression coil parallel low-resistance grounding device has certain defects, for example, the technical scheme disclosed by the prior art CN206096310U, so that the process of testing the arc suppression coil parallel low-resistance grounding device and verifying the reliability of the arc suppression coil parallel low-resistance grounding device is particularly important in the process of connecting the arc suppression coil parallel low-resistance grounding device. However, a test method for connecting the arc extinguishing coil with the low-resistance grounding device in parallel is lacked in the market at present.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for testing a parallel low-resistance grounding device for an arc suppression coil, which can verify the reliability of the parallel low-resistance grounding device for the arc suppression coil.
In a first aspect, an embodiment of the present invention provides a method for testing an arc suppression coil parallel low-resistance grounding device, including the following steps:
the first switch module, the second switch module and the third switch module are sequentially controlled to carry out switching for N times so as to sequentially simulate single-phase metallic earth fault, single-phase impedance earth fault and single-phase arc earth fault; the first ends of the first switch module, the second switch module and the third switch module are connected to a three-phase system, and the second end of the first switch module is grounded; the second end of the second switch module is grounded through a ground resistor; the second end of the third switch module is grounded through a fuse; under any single-phase fault state of the single-phase metallic earth fault, the single-phase impedance earth fault and the single-phase arc earth fault, controlling the arc suppression coil to be connected with the low-resistance earth resistor in the low-resistance earth device in parallel for switching; wherein the duration of grounding in a single phase fault condition is greater than the delay throw-in time of the low resistance grounding resistor;
acquiring low-resistance switching parameters corresponding to single-phase metallic earth fault, single-phase impedance earth fault and single-phase arc earth fault as first test parameters; wherein the low resistance switching parameters include: a neutral-to-ground voltage when the low-resistance grounding resistor is not switched in, a compensation current output by the arc suppression coil, and a grounding point current, a current of the low-resistance grounding resistor when the low-resistance grounding resistor is switched in, and a cut-off time of the low-resistance grounding resistor;
and when the first test parameter meets the preset single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the single-phase grounding fault test.
Preferably, the method further comprises:
the first switch module and the second switch module are sequentially controlled to conduct N times of intermittent switching so as to sequentially simulate intermittent single-phase metallic ground faults and intermittent single-phase impedance ground faults;
under any one intermittent single-phase fault state of the intermittent single-phase metallic grounding fault and the intermittent single-phase impedance grounding fault, controlling the arc suppression coil to be connected with a low-resistance grounding resistor in the low-resistance grounding device in parallel for switching;
acquiring low-resistance switching parameters corresponding to the intermittent single-phase metallic grounding fault and the intermittent single-phase impedance grounding fault as second test parameters;
and when the second test parameter meets the preset intermittent single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the intermittent single-phase grounding fault test.
Preferably, the method further comprises:
controlling the first switch module to carry out single switching so as to simulate single-phase metallic earth fault;
under the single-time single-phase metallic grounding fault, controlling the arc suppression coil to be connected with a low-resistance grounding resistor in the low-resistance grounding device in parallel without switching to simulate low-resistance switching failure; wherein the grounding duration of the low-resistance grounding resistor is longer than the delay switching time for switching the low-resistance grounding resistor;
acquiring a low-resistance switching parameter corresponding to low-resistance switching failure during single-phase metallic ground fault as a third test parameter;
and when the third test parameter meets the preset low-resistance switching test condition, determining that the arc suppression coil parallel low-resistance grounding device passes a low-resistance switching failure test.
Preferably, the method further comprises:
controlling the first switch module to carry out single switching so as to simulate single-phase metallic earth fault;
under the single-time single-phase metallic grounding fault, controlling an arc suppression coil to be connected with a low-resistance grounding resistor in a low-resistance grounding device in parallel for switching, and controlling the low-resistance grounding resistor not to exit after the switching time of the low-resistance grounding resistor reaches the preset time so as to simulate the low-resistance exit failure; wherein the grounding duration of the low-resistance grounding resistor is longer than the delay switching time for switching the low-resistance grounding resistor;
acquiring a low-resistance switching parameter corresponding to the low-resistance exit failure in a single-phase metallic ground fault, and taking the low-resistance switching parameter as a fourth test parameter;
and when the fourth test parameter meets a preset low-resistance exit test condition, determining that the arc suppression coil parallel low-resistance grounding device exits a failure test through the low resistance.
Preferably, the preset single-phase grounding test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; the residual current stabilization time is the time length from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the corresponding moment of the preset residual current threshold value;
when the delay input is reachedAt a time period, the low-resistance grounding resistor is switched on; wherein the delay input time period is T after the arc suppression coil is input with the compensation timeR-TLPeriod of time, TRRepresents the switching time, T, of the low-resistance grounding resistorLRepresenting the moment of putting arc suppression coil into compensation;
when a low-resistance operation period is reached, the low-resistance grounding resistor is cut off; wherein the low-resistance working time period is T after the resistance input timeR2-TRPeriod of time, TR2Indicating the moment of cut-off of the low-resistance grounding resistor.
Preferably, the preset intermittent single-phase grounding test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; the residual current stabilization time is the time length from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the corresponding moment of the preset residual current threshold value;
the low-resistance grounding resistor is switched into the low-resistance grounding resistor according to the intermittent grounding frequency M, and the low-resistance grounding resistor is not switched into the low-resistance grounding resistor when the first M-1 times of grounding occurs, and after the Mth time of grounding occurs, the low-resistance grounding resistor is switched into the low-resistance grounding resistor, and the low-resistance switching time T is recordedRWhen a low-resistance operation period is reached, the low-resistance grounding resistor is cut off; wherein the low-resistance working time period is T after the resistance input timeR2-TRPeriod of time, TR2Indicating the moment of cut-off of the low-resistance grounding resistor.
Preferably, the preset low resistance input test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; and the residual current stabilization time is the time from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the preset residual current threshold value.
Preferably, the preset low resistance exit test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; and the residual current stabilization time is the time from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the preset residual current threshold value.
In a second aspect, an embodiment of the present invention provides a test apparatus for a parallel low-resistance grounding device of a crowbar coil, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the test apparatus for a parallel low-resistance grounding device of a crowbar coil according to any one of the first aspect is implemented.
In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where the computer program, when running, controls an apparatus where the computer-readable storage medium is located to perform the arc suppression coil parallel low-resistance grounding device testing method according to any one of the first aspect.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
according to the test method, the single-phase earth fault test, the simulation intermittent single-phase earth fault test, the low-resistance input failure test and the low-resistance exit failure test are respectively carried out on the arc suppression coil parallel low-resistance grounding device, on one hand, the reliability of the arc suppression coil parallel low-resistance grounding device can be effectively verified, on the other hand, the integrity of the arc suppression coil parallel low-resistance grounding device can be verified, and therefore the power supply safety and reliability of the power distribution network are greatly improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a simulated single-phase ground fault test loop provided by an embodiment of the invention;
fig. 2 is a schematic diagram of an arc suppression coil parallel low-resistance grounding device provided by the embodiment of the invention;
FIG. 3 is a flow chart of a method for testing a parallel low-resistance grounding device of an arc suppression coil according to an embodiment of the invention;
fig. 4 is a schematic diagram of a test device for a parallel low-resistance grounding device of an arc suppression coil provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the simulated single-phase ground fault test loop includes a three-phase system power supply U, an arc suppression coil parallel low-resistance grounding device asplr, a three-phase capacitor bank C for simulating a ground capacitance of the three-phase system, a first switch module k1, a second switch module k2, and a third switch module k 3; the arc suppression coil is connected with the low-resistance grounding device in parallel and is connected with the three-phase system power supply U in three phases; the three-phase capacitor bank C is connected with the three-phase system power supply U in three phases; first ends of the first switch module K1, the second switch module K2 and the third switch module K3 are connected to a phase line of the three-phase system power supply U, and a second end of the first switch module K1 is grounded; the second end of the second switch module k2 is connected with the first end of the capacitance-to-ground resistor R1, and the second end of the capacitance-to-ground resistor R1 is grounded; the second terminal of the third switching module k3 is connected to the first terminal of the fuse D, and the second terminal of the fuse is grounded. The fuse D is used for short-circuiting two poles of the air gap, and the two poles of the air gap are formed by metal wires.
In the embodiment of the present invention, the three-phase system power supply U is configured to simulate an electric three-phase system, and the three-phase capacitor bank includes the first capacitor, the second capacitor, and the third capacitor, which are respectively connected to three-phase lines of the three-phase system power supply U in a one-to-one correspondence manner, and is configured to simulate a ground capacitor of the electric three-phase system; a single phase metallic earth fault is simulated by closing the first switching module K1, a single phase resistive earth fault is simulated by closing the second switching module K2, and a single phase arc earth fault is simulated by closing the third switching module K3.
As shown in fig. 2, the arc suppression coil parallel low-resistance grounding device includes: the device comprises an arc suppression coil device L, a grounding transformer 1, a low-resistance grounding resistor R, a low-resistance fling-cut switch K and a controller 2; the three-phase input end of the grounding transformer 1 is used for being connected to a power grid, and the output end of the grounding transformer 1 is connected with the input end of the arc suppression coil device L and the first end of the low-resistance switching switch; the second end of the low-resistance switching switch is connected with the first end of the low-resistance grounding resistor R; the output end of the arc suppression coil device L and the second end of the low-resistance grounding resistor R are grounded; the controller 2 is connected with the control end of the low-resistance switching switch and is used for identifying fault point transition resistance and transition resistance control and controlling switching of the low-resistance grounding resistor R according to the fault point transition resistance and the critical transition resistance.
The grounding transformer 1 is a Y-type wiring three-winding transformer, wherein a neutral point of the grounding transformer 1 is connected with an input end of the arc suppression coil device L.
The arc suppression coil parallel low-resistance grounding device further comprises a first voltage transformer (not shown in the figure) and a second voltage transformer (not shown in the figure) which are connected with the controller 2; the first voltage transformer is used for being connected to a power grid bus and measuring phase voltage of a single-phase earth fault phase; the second voltage transformer is connected between the neutral point of the grounding transformer 1 and the input end of the arc suppression coil device L and is used for detecting the neutral point of the grounding transformer 1 to the ground voltage; and the first current transformer is used for measuring the grounding point current.
The arc suppression coil parallel low-resistance grounding device further comprises a current transformer (not identified in the figure) connected with the controller 2, and the current transformer is connected to a branch of the arc suppression coil device L and used for detecting compensation current during compensation of the arc suppression coil device L.
The arc suppression coil parallel low-resistance grounding device further comprises a display module (not marked in the figure) connected with the controller 2 and used for displaying a fault point transition resistance monitoring result.
After the single-phase earth fault occurs, if the fault is not eliminated after the low resistance is put into the device for the first time, in the subsequent arc suppression coil compensation process, the device determines whether to put into the low resistance again according to the fault point transition resistance monitoring result, and then dynamic fault identification and isolation are realized. The working principle of the arc suppression coil parallel low-resistance grounding device is as follows:
the neutral point is in a grounded state through an arc suppression coil during normal operation; when a single-phase earth fault occurs, the arc suppression coil is compensated for a short time to eliminate transient faults; if the ground fault does not disappear after short-time compensation or the system has multiple transient ground faults during monitoring, a low-resistance grounding resistor R is added after a certain delay to increase the fault current of the grounding point, so that the sensitivity of relay protection is enhanced. After the low-resistance grounding resistor R is put into the device for a certain time, the low-resistance grounding resistor R is withdrawn; if the fault does not disappear, the arc suppression coil continues to compensate for a certain time (generally < 2h), during the period, the arc suppression coil is connected with a low-resistance grounding device in parallel and simultaneously starts a fault point transition resistance monitoring and identifying function, if the fault point transition resistance is monitored to be smaller than or equal to a critical transition resistance, the low-resistance grounding resistor R is put into use again to increase the fault point grounding current to trigger the action of the relay protection device, otherwise, the arc suppression coil continues to maintain the compensation state; and if the fault disappears, the arc suppression coil compensation state is exited.
Referring to fig. 3, a first embodiment of the present invention provides a method for testing a parallel low-resistance grounding device of an arc suppression coil, which includes the following steps:
s11: the first switch module, the second switch module and the third switch module are sequentially controlled to carry out switching for N times so as to sequentially simulate single-phase metallic earth fault, single-phase impedance earth fault and single-phase arc earth fault; the first ends of the first switch module, the second switch module and the third switch module are connected to a three-phase system, and the second end of the first switch module is grounded; the second end of the second switch module is grounded through a ground resistor; the second end of the third switch module is grounded through a fuse; under any single-phase fault state of the single-phase metallic earth fault, the single-phase impedance earth fault and the single-phase arc earth fault, controlling the arc suppression coil to be connected with the low-resistance earth resistor in the low-resistance earth device in parallel for switching; wherein the duration of grounding in a single phase fault condition should be greater than the delay throw time of the low resistance grounding resistor.
S12: acquiring low-resistance switching parameters corresponding to single-phase metallic earth fault, single-phase impedance earth fault and single-phase arc earth fault as first test parameters; wherein the low resistance switching parameters include: a neutral-to-ground voltage when the low-resistance grounding resistor is not switched in, a compensation current output by the arc suppression coil, and a grounding point current, a current of the low-resistance grounding resistor when the low-resistance grounding resistor is switched in, and a cut-off time of the low-resistance grounding resistor;
s13: and when the first test parameter meets the preset single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the single-phase grounding fault test.
Further, the preset single-phase grounding test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; the residual current stabilization time is the time length from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the corresponding moment of the preset residual current threshold value;
when reaching the time delay switching time period, the low-resistance grounding resistor is switched; wherein the delay input time period is T after the arc suppression coil is input with the compensation timeR-TLPeriod of time, TRRepresents the switching time, T, of the low-resistance grounding resistorLRepresenting the moment of putting arc suppression coil into compensation;
when a low resistance cut-off period is reached, the low resistance grounding resistor is cut off; wherein the low resistance cutting time period is T after the resistance cutting timeR2-TRPeriod of time, TR2Indicating the moment of cut-off of the low-resistance grounding resistor.
In the embodiment of the invention, N is not less than 5. Under the conditions that U is equal to the nominal voltage of a system and the system capacitance current is equal to the rated current of the arc suppression coil, single-phase grounding tests are carried out by using switching devices K1, K2 and K3, the arc suppression coil device sets the detuning degree (or the compensation state and the maximum residual current), and each state test is repeated for 5 times. When the low-resistance grounding resistor is not switched in, switched in and switched off, parameters such as neutral point-to-ground voltage (namely voltage at two ends of the arc suppression coil), compensation current output by the arc suppression coil, grounding point current and the like are recorded, and corresponding waveform diagrams are generated, so that residual current stabilization time, residual current size (taking the maximum value in each grounding test) and arc suppression coil switching compensation time are determined according to the waveform diagram of the compensation current and the waveform of the grounding point current.
The method comprises the following steps of 1: the neutral-to-ground voltage (i.e., the voltage across the arc suppression coil) is the device start-up voltage, and this parameter can be set according to system requirements. Usually, it is generally 20% to 35% Un (Un is the system nominal voltage divided by the system nominal voltage)
). The neutral point recorded by the test is used for grounding at each testAnd (4) a voltage waveform chart, and whether the device is normally started when the starting voltage is reached is judged.
The method comprises the following steps: the residual current stabilization time is the time interval from the starting moment of the single-phase grounding of the system to the residual current smaller than the set value of the device, and the parameter is used for checking the compensation performance of the arc elimination coil in the device. The statistical method at each test was: recording a time interval delta T1 required by the device to detect grounding and adjust to a compensation state set by the arc suppression coil after grounding occurs; next, the recording apparatus starts outputting the transition time Δ T2 required for the compensation current to be less than the set value in the set compensation state. The sum of Δ T1 and Δ T2 is the residual flow settling time. The residual flow stabilization time should be less than a preset time threshold value during each test. Preferably, the preset time threshold is 200 ms.
Requirement 3: the residual current magnitude refers to the magnitude of the current of the grounding point when the arc suppression coil is stably compensated, and the parameter is used for checking the compensation performance of the arc suppression coil in the device. During each test, the size of the residual flow should be smaller than a preset residual flow threshold (generally set to 10A), if the residual flow obtained by the test is larger than a preset constant residual flow threshold, it is determined that the test fails, otherwise, the test passes.
And 4, requirement: from the waveform diagram of the current of the low-resistance grounding resistor, the low-resistance throw-in time T can be determinedR。TR-TLThe parameter value can be set by a device for low resistance delay input time, and is generally between 3 and 10 seconds. After the moment when the arc suppression coil is put into compensation (T)R-TL) At that moment, the low-resistance grounding resistor should be put in, if (T) is reachedR-TL) If not, the test is not passed, otherwise, the test is passed. The moment when the arc suppression coil is put into compensation is the moment TL when the arc suppression coil starts to output the compensation current, and the moment can be determined through a waveform diagram of the compensation current output by the arc suppression coil.
The requirements are 5: after the low-resistance grounding resistor is cut off, the low-resistance working time is generally 2-3 seconds, and the parameter can be set. From the waveform of the current of the low-resistance grounding resistor, the low-resistance cutting-off time T can be determinedR2Then a low resistance cut off period of time T can be obtainedR2-TR. When the low resistance is cut after the low resistance cut time period is reached, the test passes, otherwise it does not.
When the single-phase metallic earth fault, the single-phase impedance earth fault and the single-phase arc earth fault in the step S11-13 all meet the requirements 1-5, the device is considered to pass the test, and the reliability of the arc suppression coil parallel low-resistance earthing device can be effectively verified through the test method, so that the power supply safety and reliability of the power distribution network are greatly improved.
In an optional embodiment, the method further comprises:
the first switch module and the second switch module are sequentially controlled to conduct N times of intermittent switching so as to sequentially simulate intermittent single-phase metallic ground faults and intermittent single-phase impedance ground faults;
under any one intermittent single-phase fault state of the intermittent single-phase metallic grounding fault and the intermittent single-phase impedance grounding fault, controlling the arc suppression coil to be connected with a low-resistance grounding resistor in the low-resistance grounding device in parallel for switching;
acquiring low-resistance switching parameters corresponding to the intermittent single-phase metallic grounding fault and the intermittent single-phase impedance grounding fault as second test parameters;
and when the second test parameter meets the preset intermittent single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the intermittent single-phase grounding fault test.
Further, the preset intermittent single-phase grounding test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; the residual current stabilization time is the time length from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the corresponding moment of the preset residual current threshold value;
low resistance grounding resistor based on intermittent grounding frequency MInputting a low-resistance grounding resistor, and after the first M-1 times of grounding, inputting the low resistance, and recording the low-resistance input time TRWhen a low-resistance operation period is reached, the low-resistance grounding resistor is cut off; wherein the low-resistance working time period is T after the resistance input timeR2-TRPeriod of time, TR2Indicating the moment of cut-off of the low-resistance grounding resistor.
The method comprises the following steps: the low-resistance grounding resistor is switched in according to the intermittent grounding frequency M, and the low-resistance grounding resistor is not switched in when the first M-1 times of grounding and is switched in after the Mth time of grounding.
In embodiments of the invention, the low resistance grounding resistor should be switched on the low resistance grounding resistor according to the intermittent grounding frequency M (instead of being switched on the requirement 5), in which case the low resistance grounding resistor should not be activated during the first M-1 grounding, and the device should be activated immediately after the Mth grounding occurs, switching on the low resistance grounding resistor
For a detailed description of the preset intermittent single-phase grounding test conditions, reference is made to the above requirements 1-3, 5 and 6, and the detailed description is omitted.
In the embodiment of the invention, an intermittent single-phase grounding test (respectively performed in a metallic grounding state and an impedance grounding state) is performed by using a method of rapidly switching and switching grounding switches K1 and K2, wherein at least N +2 times of grounding (N is more than or equal to 3) is required in the process, the interval between every two times of grounding is not more than 1s, and the duration of single grounding is less than the delay switching time of a low-resistance grounding resistor. The damping rate of the test loop is less than or equal to 3 percent; the test voltage U should not be less than 20% Un (Un is the system line voltage divided by the system line voltage)
And can ensure that the device can be started normally when the grounding is simulated under the voltage. And recording data such as neutral point-to-ground voltage (namely voltage at two ends of the arc suppression coil), arc suppression coil output current, grounding point current, low resistance input time, input duration and the like in the whole test process. Determined by the recorded waveform atWhether the device outputs a compensation current when a ground fault occurs, whether the device exits compensation during a ground fault interval, and whether a series resonance phenomenon occurs. The arc suppression coil should be able to continuously output a compensation current at each grounding interval, and to withdraw from the compensation and avoid the occurrence of series resonance during each two grounding intervals.
In an optional embodiment, the method further comprises:
controlling the first switch module to carry out single switching so as to carry out single-phase metallic earth fault;
under the single-time single-phase metallic grounding fault, controlling the arc suppression coil to be connected with a low-resistance grounding resistor in the low-resistance grounding device in parallel without switching to simulate low-resistance switching failure; wherein the grounding duration is longer than the setting time for switching in the low-resistance grounding resistor;
acquiring a low resistance switching parameter corresponding to low resistance switching loss during single-phase metallic earth fault as a third test parameter;
and when the third test parameter meets the preset low-resistance switching test condition, determining that the arc suppression coil parallel low-resistance grounding device passes a low-resistance switching failure test.
Further, the preset low resistance input test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; and the residual current stabilization time is the time from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the preset residual current threshold value.
For a detailed description of the predetermined low resistance input test conditions, refer to the above requirements 1 to 3, and the detailed description is omitted.
In the embodiment of the invention, a single-phase grounding test (in a metallic grounding state) is carried out by a method of rapidly switching on and off the grounding switch k 1. The grounding duration time should be longer than the setting time for putting into low resistance to ensure the condition of putting into low resistance is triggered. During the test, the low resistance is controlled not to be put into the test by the controller so as to simulate the failure of the low resistance putting into the test during the single-phase earth fault. At the moment, the arc suppression coil parallel low-resistance grounding device meets the requirement 1-3, and in addition, the device also controls the operation state of the arc suppression coil according to the fault condition and gives an alarm.
In an optional embodiment, the method further comprises:
controlling the first switch module to carry out single switching so as to simulate single-phase metallic earth fault;
under the single-time single-phase metallic grounding fault, controlling an arc suppression coil to be connected with a low-resistance grounding resistor in a low-resistance grounding device in parallel for switching, and controlling the low-resistance grounding resistor not to exit after the switching time of the low-resistance grounding resistor reaches the preset time so as to simulate the low-resistance exit failure; wherein the grounding duration of the low-resistance grounding resistor is longer than the delay switching time for switching the low-resistance grounding resistor; (ii) a
Acquiring a low-resistance switching parameter corresponding to the low-resistance exit failure in a single-phase metallic ground fault, and taking the low-resistance switching parameter as a fourth test parameter;
and when the fourth test parameter meets a preset low-resistance exit test condition, determining that the arc suppression coil parallel low-resistance grounding device exits a failure test through the low resistance.
Further, the preset low resistance exit test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; and the residual current stabilization time is the time from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the preset residual current threshold value.
For a detailed description of the predetermined low resistance exit test condition, please refer to the above requirements 1-3, and the detailed description is omitted.
In the embodiment of the invention, a single-phase grounding test (in a metallic grounding state) is carried out by a method of rapidly switching on and off the grounding switch k 1. The grounding duration time should be longer than the setting time for putting into low resistance to ensure the condition of putting into low resistance is triggered. After the low resistance is switched on and exceeds the set time, the low resistance is controlled not to exit through the controller so as to simulate the failure of exiting the low resistance when the single-phase earth fault occurs. At the moment, the arc suppression coil parallel low-resistance grounding device meets the requirement 1-3, and in addition, the device also controls the operation state of the arc suppression coil according to the fault condition and gives an alarm.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
according to the test method, the single-phase earth fault test, the simulation intermittent single-phase earth fault test, the low-resistance input failure test and the low-resistance exit failure test are respectively carried out on the arc suppression coil parallel low-resistance grounding device, on one hand, the reliability of the arc suppression coil parallel low-resistance grounding device can be effectively verified, on the other hand, the integrity of the arc suppression coil parallel low-resistance grounding device can be verified, and therefore the power supply safety and reliability of the power distribution network are greatly improved.
Referring to fig. 4, it is a schematic diagram of a testing apparatus for a parallel low-resistance grounding device of an arc suppression coil according to a second embodiment of the present invention. As shown in fig. 4, the arc suppression coil parallel low-resistance grounding device test apparatus includes: at least one processor 11, such as a CPU, at least one network interface 14 or other user interface 13, a memory 15, at least one communication bus 12, the communication bus 12 being used to enable connectivity communications between these components. The user interface 13 may optionally include a USB interface, and other standard interfaces, wired interfaces. The network interface 14 may optionally include a Wi-Fi interface as well as other wireless interfaces. The memory 15 may comprise a high-speed RAM memory, and may also include a non-volatile at i memory, such as at least one disk memory. The memory 15 may optionally comprise at least one memory device located remotely from the aforementioned processor 11.
In some embodiments, memory 15 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:
an operating system 151, which contains various system programs for implementing various basic services and for processing hardware-based tasks;
and (5) a procedure 152.
Specifically, the processor 11 is configured to call the program 152 stored in the memory 15, and execute the arc suppression coil parallel low-resistance grounding device testing method described in the foregoing embodiment, for example, step S11 shown in fig. 1. Alternatively, the steps in the above method embodiments are implemented when the processor executes the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the arc suppression coil parallel low resistance grounding device test apparatus.
The arc suppression coil parallel low-resistance grounding device test equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The arc suppression coil parallel low-resistance grounding device test equipment can comprise, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the schematic diagram is merely an example of a test apparatus for a parallel low resistance grounding device for a arc suppression coil and does not constitute a limitation of the test apparatus for a parallel low resistance grounding device for an arc suppression coil, and may include more or fewer components than those shown, or some components in combination, or different components.
The Processor 11 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The processor 11 is a control center of the arc suppression coil parallel low-resistance grounding device test equipment, and various interfaces and lines are used for connecting all parts of the arc suppression coil parallel low-resistance grounding device test equipment.
The memory 15 can be used to store the computer program and/or module, and the processor 11 implements various functions of the arc suppression coil parallel low-resistance grounding device test equipment by operating or executing the computer program and/or module stored in the memory and calling data stored in the memory. The memory 15 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 15 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The module/unit integrated by the arc suppression coil parallel low-resistance grounding device test equipment can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and is sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The third implementation of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the arc suppression coil parallel low-resistance grounding device testing method as described in any one of the above.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A test method for an arc suppression coil parallel low-resistance grounding device is characterized by comprising the following steps:
the first switch module, the second switch module and the third switch module are sequentially controlled to carry out switching for N times so as to sequentially simulate single-phase metallic earth fault, single-phase impedance earth fault and single-phase arc earth fault; the first ends of the first switch module, the second switch module and the third switch module are connected to a three-phase system, and the second end of the first switch module is grounded; the second end of the second switch module is grounded through a ground resistor; the second end of the third switch module is grounded through a fuse; under any single-phase fault state of the single-phase metallic earth fault, the single-phase impedance earth fault and the single-phase arc earth fault, controlling the arc suppression coil to be connected with the low-resistance earth resistor in the low-resistance earth device in parallel for switching; wherein the duration of grounding in a single phase fault condition is greater than the delay throw-in time of the low resistance grounding resistor;
acquiring low-resistance switching parameters corresponding to single-phase metallic earth fault, single-phase impedance earth fault and single-phase arc earth fault as first test parameters; wherein the low resistance switching parameters include: a neutral-to-ground voltage when the low-resistance grounding resistor is not switched in, a compensation current output by the arc suppression coil, and a grounding point current, a current of the low-resistance grounding resistor when the low-resistance grounding resistor is switched in, and a cut-off time of the low-resistance grounding resistor;
and when the first test parameter meets the preset single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the single-phase grounding fault test.
2. The arc suppression coil parallel low resistance grounding apparatus testing method of claim 1, wherein said method further comprises:
the first switch module and the second switch module are sequentially controlled to conduct N times of intermittent switching so as to sequentially simulate intermittent single-phase metallic ground faults and intermittent single-phase impedance ground faults;
under any one intermittent single-phase fault state of the intermittent single-phase metallic grounding fault and the intermittent single-phase impedance grounding fault, controlling the arc suppression coil to be connected with a low-resistance grounding resistor in the low-resistance grounding device in parallel for switching;
acquiring low-resistance switching parameters corresponding to the intermittent single-phase metallic grounding fault and the intermittent single-phase impedance grounding fault as second test parameters;
and when the second test parameter meets the preset intermittent single-phase grounding test condition, determining that the arc suppression coil parallel low-resistance grounding device passes the intermittent single-phase grounding fault test.
3. The arc suppression coil parallel low resistance grounding apparatus testing method of claim 2, wherein said method further comprises:
controlling the first switch module to carry out single switching so as to simulate single-phase metallic earth fault;
under the single-time single-phase metallic grounding fault, controlling the arc suppression coil to be connected with a low-resistance grounding resistor in the low-resistance grounding device in parallel without switching to simulate low-resistance switching failure; wherein the grounding duration of the low-resistance grounding resistor is longer than the delay switching time for switching the low-resistance grounding resistor;
acquiring a low-resistance switching parameter corresponding to low-resistance switching failure during single-phase metallic ground fault as a third test parameter;
and when the third test parameter meets the preset low-resistance switching test condition, determining that the arc suppression coil parallel low-resistance grounding device passes a low-resistance switching failure test.
4. A method of testing an arc suppression coil parallel low resistance grounding device as set forth in claim 3, said method further comprising:
controlling the first switch module to carry out single switching so as to simulate single-phase metallic earth fault;
under the single-time single-phase metallic grounding fault, controlling an arc suppression coil to be connected with a low-resistance grounding resistor in a low-resistance grounding device in parallel for switching, and controlling the low-resistance grounding resistor not to exit after the switching time of the low-resistance grounding resistor reaches the preset time so as to simulate the low-resistance exit failure; wherein the grounding duration of the low-resistance grounding resistor is longer than the delay switching time for switching the low-resistance grounding resistor;
acquiring a low-resistance switching parameter corresponding to the low-resistance exit failure in a single-phase metallic ground fault, and taking the low-resistance switching parameter as a fourth test parameter;
and when the fourth test parameter meets a preset low-resistance exit test condition, determining that the arc suppression coil parallel low-resistance grounding device exits a failure test through the low resistance.
5. The arc suppression coil parallel low-resistance grounding device testing method according to claim 1, wherein the preset single-phase grounding test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; the residual current stabilization time is the time length from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the corresponding moment of the preset residual current threshold value;
when a delay switching time period is reached, the low-resistance grounding resistor is switched; wherein the delay input time period is T after the arc suppression coil is input with the compensation timeR-TLPeriod of time, TRRepresents the switching time, T, of the low-resistance grounding resistorLRepresenting the moment of putting arc suppression coil into compensation;
when a low-resistance operation period is reached, the low-resistance grounding resistor is cut off; wherein the low-resistance working time period is T after the resistance input timeR2-TRPeriod of time, TR2Indicating the moment of cut-off of the low-resistance grounding resistor.
6. The arc suppression coil parallel low-resistance grounding device testing method as claimed in claim 2, wherein the preset intermittent single-phase grounding test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; the residual current stabilization time is the time length from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the corresponding moment of the preset residual current threshold value;
the low-resistance grounding resistor is switched into the low-resistance grounding resistor according to the intermittent grounding frequency M, and the low-resistance grounding resistor is not switched into the low-resistance grounding resistor when the first M-1 times of grounding occurs, and after the Mth time of grounding occurs, the low-resistance grounding resistor is switched into the low-resistance grounding resistor, and the low-resistance switching time T is recordedRWhen a low-resistance operation period is reached, the low-resistance grounding resistor is cut off; wherein the low-resistance working time period is T after the resistance input timeR2-TRPeriod of time, TR2Indicating the moment of cut-off of the low-resistance grounding resistor.
7. A method for testing an arc suppression coil parallel low-resistance grounding device according to claim 3, wherein the preset low-resistance input test conditions include:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; and the residual current stabilization time is the time from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the preset residual current threshold value.
8. The arc suppression coil parallel low-resistance grounding device testing method according to claim 4, wherein the preset low-resistance exit test condition includes:
the neutral point-to-ground voltage is greater than a preset starting voltage;
the current of the grounding point after the arc suppression coil compensation is smaller than a preset residual current threshold value;
the residual flow stabilization time is less than a preset time threshold; and the residual current stabilization time is the time from the moment when the arc suppression coil starts to output the compensation current to the moment when the current of the grounding point is smaller than the preset residual current threshold value.
9. A crowbar coil parallel low resistance grounding device testing apparatus comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing the crowbar coil parallel low resistance grounding device testing method of any one of claims 1 to 8.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform a method of testing a crowbar coil parallel low-resistance grounding device according to any one of claims 1 to 8.
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| CN113848521A (en) * | 2020-06-28 | 2021-12-28 | 李景禄 | Automatic tracking arc suppression coil field checking and fault handling test method |
| CN114156855A (en) * | 2021-12-08 | 2022-03-08 | 国网辽宁省电力有限公司朝阳供电公司 | Dynamic full-compensation arc suppression coil for power distribution network grounding residual current and input and exit method thereof |
| CN114280415A (en) * | 2021-12-14 | 2022-04-05 | 国网江苏省电力有限公司常州供电分公司 | Power distribution network ground fault processing method based on parallel resistors of arc suppression coils |
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