CN113884815B - Method for testing maximum operation induction voltage of single-end grounding system of high-voltage cable - Google Patents
Method for testing maximum operation induction voltage of single-end grounding system of high-voltage cable Download PDFInfo
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Abstract
The invention discloses a method for testing the maximum operation induction voltage of a single-end grounding system of a high-voltage cable line, which comprises the steps of shorting the end of a line where a tested grounding system is positioned by using a shorting wire, shorting the end after penetrating a core penetrating transformer of a three-phase variable frequency current lifting device and a current testing device, injecting line core symmetry and power frequency distinguishing current through magnetic induction coupling by using the three-phase variable frequency current lifting device, testing by using a voltage measuring device to obtain the copper bar voltage of the tested grounding system, repeating the steps, coupling and injecting the current with consistent phase sequence of the line core symmetry and power frequency distinguishing current into a common-channel adjacent line, and finally calculating the maximum operation induction voltage of the tested grounding system according to ohm and electromagnetic induction law. The invention can accurately test the maximum operation induction voltage of the single-end grounding system of the high-voltage cable way, and has simple and convenient operation and high efficiency.
Description
Technical Field
The invention relates to a method for testing the maximum operation induction voltage of a single-end grounding system of a high-voltage cable way, and belongs to the technical field of power transmission and transformation equipment.
Background
At present, the induction voltage of a metal sheath of a single-end grounding system of a high-voltage cable line is too high, the risk of personnel electric shock is generally not very high by 50V, the induction voltage is conventionally calculated according to theory or the induction voltage is tested after the line is put into operation, and the problems of large error, no consideration of the influence of a common-channel cable line and high outage correction cost exist.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for testing the maximum operation induction voltage of the single-end grounding system of the high-voltage cable line, which can accurately test the maximum operation induction voltage of the single-end grounding system of the high-voltage cable line, and has the advantages of simple and convenient operation and high efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for testing the maximum operation induction voltage of a single-end grounding system of a high-voltage cable circuit, which comprises the following steps:
The device for constructing and testing the maximum operation induction voltage of the single-end grounding system of the high-voltage cable comprises three-phase variable-frequency current-rising equipment and a voltage testing device; the three-phase variable frequency current-rising device comprises a control cabinet, a three-channel variable frequency power supply, three voltage regulators, three core penetration transformers, a current testing device and a short-circuit wire; the three-channel variable-frequency power supply, the three voltage regulators and the current testing device are all connected with the control cabinet; the control cabinet is used for controlling the output of the three-channel variable-frequency power supply and the three voltage regulators and displaying the test result of the current test device; the three-channel variable-frequency power supply is connected with the three voltage regulators, and the three voltage regulators are respectively connected with the three core penetrating transformers; the shorting stub is used for connecting the head and tail ends of the tested high-voltage cable with the high-voltage cable core; the shorting stub is connected with three core penetrating transformer and current testing devices; the voltage testing device is used for testing the three-phase voltage of the high-voltage cable line of the single-end grounding system of the tested high-voltage cable line;
The current testing device is adopted to test the current of the high-voltage cable circuit where the tested grounding system is positioned at the exciting frequency F1, so as to obtain a current I1;
The voltage testing device is adopted to test the voltage of the three-phase copper bar of the high-voltage cable circuit protection grounding box where the tested grounding system is located under the three-phase symmetrical current of the exciting frequency F1 and the current I1 injected into the high-voltage cable circuit, so as to obtain three-phase voltages UA1, UB1 and UC1;
selecting a high-voltage cable circuit adjacent to or In the same channel as the high-voltage cable circuit where the tested grounding system is positioned, and testing current In at an excitation frequency Fn and voltages UAn, UBn and UCn injected into the excitation frequency Fn and the current In under three-phase symmetrical current;
based on the current and the three-phase voltage obtained by the test, calculating the three-phase operation induction voltage of the tested grounding system;
And determining the maximum operation induction voltage of the tested grounding system based on the three-phase operation induction voltage of the tested grounding system.
Further, the control cabinet is used for controlling the three-channel variable-frequency power supply to output variable-frequency current with preset amplitude and phase.
Further, the control cabinet is used for controlling the three voltage regulators to output the voltage with preset amplitude.
Further, the control cabinet is used for displaying the three-phase current amplitude and the three-phase current tested by the current testing device.
Further, the three-channel variable frequency power supply is used for outputting variable frequency currents with three-phase symmetry and equal amplitude to be respectively supplied to the three voltage regulators.
Further, the current testing device has a testing resolution less than 1A.
Further, the voltage testing device has a testing resolution of less than 1V.
Further, the calculating the three-phase operation induction voltage of the tested system based on the current and the three-phase voltage obtained by the test includes:
Ua= { Σ (UAn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
Ub= { Σ (UBn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
UC= { Σ (UCn. Times.INn/(In. Times.Fn) } F, n.gtoreq.1 and n.epsilon.N+;
UA, UB and UC are three-phase voltage values of the tested grounding system under the common influence of power frequency current passing through a high-voltage cable line and an adjacent high-voltage cable line; n is the number of high-voltage cable lines tested, fn is the exciting frequency injected by the nth high-voltage cable line tested, INn is the rated running current of the nth high-voltage cable line tested, and F is the running frequency of the high-voltage cable line where the tested grounding system is located.
Further, the maximum value of the three-phase operation induction voltages is selected as the maximum operation induction voltage of the single-end grounding system of the tested high-voltage cable circuit.
The beneficial effects of the invention are as follows:
The invention provides a method for testing the maximum operation induction voltage of a single-end grounding system of a high-voltage cable line, which is characterized in that the head end, the three-phase cable core of the tail end cable line or the outdoor terminal of the tested high-voltage cable line are respectively short-circuited by using a short-circuit wire in the test, the three-phase variable frequency current-raising equipment is used for injecting symmetrical and power frequency-distinguishing current of the test cable line through coupling, the induction voltage of a three-phase copper bar of a protection grounding box of the single-end grounding system of the tested high-voltage cable line under different loop excitation currents is tested, and the maximum operation induction voltage of the single-end grounding system of the tested high-voltage cable line is calculated according to ohm and electromagnetic induction law. The invention can accurately test the maximum operation induction voltage of the single-end grounding system of the high-voltage cable line, has simple and convenient operation and high efficiency, and can judge the defects of the line grounding system according to the maximum operation induction voltage.
Drawings
FIG. 1 is a schematic diagram of a single-ended system of cables;
FIG. 2 is a schematic diagram of a circuit current driven test of a system under test ground;
FIG. 3 is a schematic diagram of a test under current excitation of adjacent lines of a tested ground system.
Detailed Description
The invention is further described below. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
The schematic diagram of the single-end grounding system of the high-voltage cable is shown in fig. 1, and when the current passes through the circuit, induced voltage is generated on the side of the single-end grounding system protection grounding box.
In one aspect, the invention provides a device for testing the maximum operation induction voltage of a single-end grounding system of a high-voltage cable, which is shown in fig. 2 and 3, and comprises three-phase variable-frequency current-lifting equipment and a voltage testing device.
The three-phase variable-frequency current-rising device comprises a control cabinet, a three-channel variable-frequency power supply, three voltage regulators, three core penetration transformers, a current testing device and a short-circuit wire;
The control cabinet is connected with the three-channel variable-frequency power supply and is used for controlling the three-channel variable-frequency power supply to output variable-frequency current with preset amplitude and phase;
The control cabinet is connected with the three voltage regulators and used for controlling the voltage regulators to output voltage with preset amplitude values;
The control cabinet is connected with the current testing device and is used for displaying the amplitude and the phase of the three-phase current tested by the current testing device;
the three-channel variable frequency power supply is connected with the voltage regulator and used for outputting variable frequency currents with three-phase symmetry and equal amplitude to be respectively supplied to the voltage regulator;
The three voltage regulators are respectively connected with the three core penetrating transformers and can independently boost and control, and are used for regulating the input voltage and current of the core penetrating transformers;
the three core penetrating transformers are connected with three-phase high-voltage cable leads to provide current with the same frequency and symmetry for the three-wire cable;
The current testing device is connected with the three-phase high-voltage cable lead and used for testing the current amplitude and the phase of the three-phase high-voltage cable.
The short wire is used for connecting the head end, the tail end or the outdoor terminal of the tested high-voltage cable line to form a current closed path for the tested cable line; the shorting bars are connected into three through core transformer and current testing devices.
Further, the three-channel variable frequency power supply outputs three-phase output current with independently adjustable phases.
Further, the voltage control of the voltage regulator is independently adjustable.
Further, the current testing device tests that the minimum resolution is less than 1A.
The voltage testing device is used for testing the ground induction voltage of the single-end grounding system of the high-voltage cable circuit.
Further, the voltage testing device has the function of testing voltage values under different frequencies, and the testing resolution is smaller than 1V.
The invention also provides a method for testing the maximum operation induction voltage of the single-end grounding system of the high-voltage cable circuit, which comprises the following steps:
step one: the three-phase cable core or the outdoor terminal of the excited high-voltage cable line N1 is short-circuited by a short-circuit wire, and the short-circuit wire is respectively connected into a core penetrating transformer and a current testing device of the three-phase frequency conversion current-lifting equipment by one optional end.
Step two: the frequency conversion power supply and the voltage regulator are used for controlling the excitation frequency F1 and the input voltage to be injected into the core penetration transformer, and a current testing device is used for testing to obtain the current I1 of the tested cable line. The input voltage does not exceed the rated input voltage of the through core transformer.
Step three: the three-phase copper bar of the tested high-voltage cable circuit protection grounding box is tested by adopting a voltage testing device, and the induced voltages are UA1, UB1 and UC1 under the condition that N1 is excited to inject current with frequency F1 and I1 three-phase symmetrical current.
Step four: and selecting a corresponding high-voltage cable line Nn from adjacent or same channels, and repeating the first, second and third steps to obtain the three-phase copper bar induction voltage of the tested high-voltage cable line protection grounding box under the conditions that the excitation frequency is Fn and the current is In, wherein the induction voltage is UAn, UBn, UCn.
It should be noted that the repetition process may be repeated several times, i.e. each time a high voltage cable loop is selected from adjacent or co-channel for testing. The injection excitation frequency is optionally selected manually at each test.
Step five: according to ohm and electromagnetic induction law, the following steps are obtained:
Ua= { Σ (UAn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
Ub= { Σ (UBn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
UC= { Σ (UCn. Times.INn/(In. Times.Fn) } F, n.gtoreq.1 and n.epsilon.N+;
UA, UB and UC are three-phase voltage values of the tested grounding system under the common influence of power frequency current introduced into the cable line and the adjacent cable lines.
N is the number of the tested high-voltage cable circuits, and is dimensionless; fn is the frequency of excitation of the nth loop line, and Hz; INn is the rated running current of the n loop line, A; f is the operating frequency of the line, hz.
Step six: let max=max (UA, UB, UC);
Based on the above result, when Umax is greater than the sheath maximum voltage UD, it is determined that the cable line grounding system is defective.
Example 1
A schematic diagram of the test under line current excitation of the tested ground system is shown in fig. 2. Shorting the three-phase cable cores or outdoor terminals of the tested high-voltage cable line at the head end and the tail end of the cable line by using shorting bars, respectively stringing the shorting bars into a core penetrating transformer and a current testing device of a three-phase frequency conversion current-lifting device at the testing end, and injecting symmetrical and power frequency-distinguishing currents of the testing cable line by using the three-phase frequency conversion current-lifting device through coupling; the method comprises the steps of adopting a voltage testing device to test the induced voltage of a three-phase copper bar of a protection grounding box of a single-end grounding system of a tested high-voltage cable line under the on-line exciting current; the steps are repeated to test and obtain the induction voltage of the three-phase copper bar of the protection grounding box of the tested single-end grounding system under the exciting current of the adjacent line, as shown in figure 3; and calculating the maximum operation induction voltage of the metal sheath of the single-end grounding system of the tested high-voltage cable circuit according to ohm and electromagnetic induction law. Meanwhile, when the maximum operation induction voltage is larger than the design safety voltage, the defect of the line grounding system can be judged. According to the method, the maximum operation induction voltage of the single-end grounding system of the high-voltage cable circuit can be accurately tested, the operation is simple and convenient, and the efficiency is high.
Example 2
Designing a common channel of two loops of a high-voltage cable line, wherein the two loops are designed to be 500A, the running frequency F is 50Hz, and the maximum design safety voltage UD of a grounding system is 50V;
the short-circuit wire is used for short-circuiting the three-phase cable core or the outdoor terminal of the excited high-voltage cable line N1 at the head end and the tail end of the cable line, and one end of the short-circuit wire is connected in series into the core penetrating transformer and the current testing device of the three-phase frequency conversion current rising equipment.
The three-phase frequency conversion current rising device is connected with a three-phase power supply, the frequency conversion power supply and the voltage regulator are used for controlling the excitation frequency F1 and the input voltage, and the current of the tested cable line is tested and obtained to be I1 by adopting the current testing device.
The voltage testing device is used for testing that the response value voltages of three phases of the tested high-voltage cable line protection grounding box are UA1, UB1 and UC1 under the condition that N1 is excited to inject current frequency F1 and I1 three-phase symmetrical current.
Shorting the three-phase cable cores or outdoor terminals of the excited high-voltage cable line N2 at the head end and the tail end of the cable line, and connecting each shorting wire in a core penetrating transformer and current testing device of the three-phase variable-frequency current lifting equipment in series.
The three-phase frequency conversion current-rising device is connected with a three-phase power supply, the frequency conversion power supply and the voltage regulator are used for controlling the excitation frequency F2 and the input voltage, and the current of the tested cable line is tested and obtained to be I2 by adopting the current testing device.
And a voltage testing device is adopted to test that the response value voltages of three phases of the tested high-voltage cable line protection grounding box are UA2, UB2 and UC2 under the condition that the N2 line is excited to inject current with frequency F2 and I2 three-phase symmetrical current.
The test data are as follows:
F1=65Hz；I1=100A；UA1=11.2；UB1=9.23；UC1=10.5；
F2=65Hz；I2=100A；UA2=3.24；UB2=2.46；UC2=3.92。
According to ohm and electromagnetic induction law, the following steps are obtained:
Ua= { Σ (UAn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
Ub= { Σ (UBn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
UC= { Σ (UCn. Times.INn/(In. Times.Fn) } F, n.gtoreq.1 and n.epsilon.N+;
wherein n=2; fn is F1 and F2, hz; INn is the line rated operating current, in1=in2=500a.
Solution:
UA={UA1*IN1/（I1*F1)+UA2*IN2/（I2*F2)}*F
={11.2*500/(100*65)+3.24*500/(100*65)}*50
=55.54V
And (3) the same principle:
UB=44.96V
UC=55.46V
Umax=MAX(UA、UB、UC)=55.54V＞UD=50V
And analyzing the maximum design induced voltage UD50V of the induced voltage of the grounding system, wherein the grounding system has defects.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. A method for testing the maximum operating induced voltage of a single-end ground system of a high-voltage cable, comprising:
The device for constructing and testing the maximum operation induction voltage of the single-end grounding system of the high-voltage cable comprises three-phase variable-frequency current-rising equipment and a voltage testing device; the three-phase variable frequency current-rising device comprises a control cabinet, a three-channel variable frequency power supply, three voltage regulators, three core penetration transformers, a current testing device and a short-circuit wire; the three-channel variable-frequency power supply, the three voltage regulators and the current testing device are all connected with the control cabinet; the control cabinet is used for controlling the output of the three-channel variable-frequency power supply and the three voltage regulators and displaying the test result of the current test device; the three-channel variable-frequency power supply is connected with the three voltage regulators, and the three voltage regulators are respectively connected with the three core penetrating transformers; the shorting stub is used for connecting the head and tail ends of the tested high-voltage cable with the high-voltage cable core; the shorting stub is connected with three core penetrating transformer and current testing devices; the voltage testing device is used for testing the three-phase voltage of the high-voltage cable line of the single-end grounding system of the tested high-voltage cable line;
The current testing device is adopted to test the current of a high-voltage cable circuit where a tested grounding system is positioned at an excitation frequency F1, so as to obtain a current I1;
The voltage testing device is adopted to test the voltage of the three-phase copper bar of the high-voltage cable line protection grounding box where the tested grounding system is located under the three-phase symmetrical current of the exciting frequency F1 and the current I1 injected into the high-voltage cable line, so as to obtain three-phase voltages UA1, UB1 and UC1;
selecting a high-voltage cable circuit adjacent to or In the same channel as the high-voltage cable circuit where the tested grounding system is positioned, and testing current In at an excitation frequency Fn and voltages UAn, UBn and UCn injected into the excitation frequency Fn and the current In under three-phase symmetrical current;
based on the current and the three-phase voltage obtained by the test, the three-phase operation induction voltage of the tested grounding system is calculated as follows:
Ua= { Σ (UAn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
Ub= { Σ (UBn ×inn/(in×fn) } F, N is not less than 1 and n∈n+;
UC= { Σ (UCn. Times.INn/(In. Times.Fn) } F, n.gtoreq.1 and n.epsilon.N+;
UA, UB and UC are three-phase voltage values of the tested grounding system under the common influence of power frequency current passing through a high-voltage cable line and an adjacent high-voltage cable line; n is the number of the tested high-voltage cable lines, fn is the exciting frequency of the injection of the tested nth high-voltage cable line, and In is the current value measured at the injection exciting frequency Fn; INn is the rated operating current of the tested nth high-voltage cable line, and F is the operating frequency of the tested grounding system in the high-voltage cable line;
And determining the maximum operation induction voltage of the tested grounding system based on the three-phase operation induction voltage of the tested grounding system.
2. The method for testing the maximum operation induction voltage of the single-end grounding system of the high-voltage cable circuit according to claim 1, wherein the control cabinet is used for controlling the three-channel variable-frequency power supply to output variable-frequency current with preset amplitude and phase.
3. The method for testing the maximum operating induction voltage of the single-end grounding system of the high-voltage cable circuit according to claim 1, wherein the control cabinet is used for controlling the three voltage regulators to output the voltage with preset amplitude.
4. The method for testing the maximum operating induction voltage of the single-end grounding system of the high-voltage cable according to claim 1, wherein the control cabinet is used for displaying the three-phase current amplitude and phase tested by the current testing device.
5. The method for testing the maximum operation induction voltage of the single-end grounding system of the high-voltage cable circuit according to claim 1, wherein the three-channel variable frequency power supply is used for outputting variable frequency currents with three-phase symmetry and equal amplitude to be respectively supplied to three voltage regulators.
6. The method for testing the maximum operating induction voltage of the single-end grounding system of the high-voltage cable according to claim 1, wherein the test resolution of the current testing device is less than 1A.
7. The method for testing the maximum operating induction voltage of the single-end grounding system of the high-voltage cable according to claim 1, wherein the voltage testing device is less than 1V in testing resolution.
8. The method for testing the maximum operating induction voltage of the single-end grounding system of the high-voltage cable circuit according to claim 1, wherein the maximum value of the three-phase operating induction voltages is selected as the maximum operating induction voltage of the single-end grounding system of the high-voltage cable circuit to be tested.
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| CN115201545B (en) * | 2022-07-07 | 2024-02-23 | 国网江苏省电力有限公司电力科学研究院 | Method for testing maximum value of induced current of high-voltage cable line cross-connection grounding system |
| CN118393263B (en) * | 2024-06-25 | 2024-09-03 | 广东君箭智能有限公司 | Cable performance detection data processing method and system |
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