CN113884772B - System and method for testing alternating-current equivalent resistance of large-section cable conductor based on proportional transformer - Google Patents
System and method for testing alternating-current equivalent resistance of large-section cable conductor based on proportional transformer Download PDFInfo
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- CN113884772B CN113884772B CN202111255551.9A CN202111255551A CN113884772B CN 113884772 B CN113884772 B CN 113884772B CN 202111255551 A CN202111255551 A CN 202111255551A CN 113884772 B CN113884772 B CN 113884772B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
A large-section cable conductor alternating-current equivalent resistance test system and method based on a proportional transformer belong to the technical field of electrical test and are provided for solving the problems that the operation is complex, the application range of a test method is narrow and the like in the prior art. The high-voltage power supply comprises an alternating current source, a large-section cable conductor, a proportional transformer, wherein the proportional transformer comprises a primary side first winding of the proportional transformer, a primary side second winding of the proportional transformer, a secondary side winding of the proportional transformer, a current transformer, an adjustable capacitor, a sampling resistor, a phase comparator, a differential amplifier A, a differential amplifier B, a proportional transformer output line, a sampling resistor output line and a phase comparator output line. The measuring precision and the anti-interference performance can be improved, the principle is simple, and the method is easy to realize.
Description
Technical Field
The invention belongs to the technical field of electrical testing, and particularly relates to a system and a method for testing alternating-current equivalent resistance of a large-section cable conductor based on a proportional transformer.
Background
Under ac excitation, the ac power cable conductor may be equivalently a series connection of a resistor and an inductor. The alternating-current equivalent resistance is a decisive parameter for calculating the current-carrying capacity of the alternating-current power cable. When alternating current flows in the alternating current power cable conductor, the alternating current equivalent resistance of the alternating current power cable conductor generates resistanceThe voltage component, the inductive voltage component will be generated across the equivalent inductance. For a cross-sectional area exceeding 1600mm 2 The inductive voltage component of the ac power cable conductor is typically more than 40 times the resistive voltage component. How to attenuate or eliminate the influence of the inductive voltage component on the resistive voltage component is a key to achieving ac equivalent resistance measurement of the ac power cable.
At present, methods commonly used for measuring the alternating-current equivalent resistance of a large-section cable conductor mainly comprise a reflow method, a bridge method and the like. The return line method is to use the metal sheath of the cable as the return line of the conductor to eliminate the influence of the proximity effect, induced voltage and loop reactance generated by the current in the conductor on the AC equivalent resistance test, but the method is not suitable for evaluating the AC equivalent resistance of the conductor of the cable without the sheath. The bridge method is based on Kelvin bridge, the large-section cable conductor sample and the standard capacitor form a bridge arm, and the equivalent resistance and inductance of the large-section cable conductor can be obtained by adjusting bridge balance, but the operation is complex.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a system and a method for testing the alternating-current equivalent resistance of a large-section cable conductor based on a proportional transformer, which can solve the problems of narrow application range, complex operation and the like of the conventional method for testing the alternating-current equivalent resistance of the large-section cable conductor.
The invention adopts the technical scheme that:
a large-section cable conductor alternating current equivalent resistance test system based on a proportional transformer comprises: the device comprises an alternating current source, a large-section cable conductor, a proportional transformer and a phase comparator, wherein the proportional transformer comprises a primary side first winding of the proportional transformer, a primary side second winding of the proportional transformer, a secondary side winding of the proportional transformer, a current transformer, an adjustable capacitor, a sampling resistor, the phase comparator, a differential amplifier A, a differential amplifier B, a proportional transformer output line, a sampling resistor output line and a phase comparator output line;
the alternating current source is connected with a large-section cable conductor, two input ends of the differential amplifier A are respectively connected with the head end and the tail end of the large-section cable conductor, the output end of the differential amplifier A is connected with the head end of a primary side first winding of a proportional transformer, a current transformer couples the current of a main loop to a secondary side winding loop formed by connecting an adjustable capacitor and a sampling resistor, two ends of the current transformer are respectively connected with one end of the adjustable capacitor and one end of the sampling resistor, the input end of the differential amplifier B is respectively connected with the head end and the tail end of the adjustable capacitor, the output end of the differential amplifier B is respectively connected with the head end of a primary side second winding of the proportional transformer, the input end of a phase comparator is respectively connected with an output line of the proportional transformer and an output line of the sampling resistor, the output line of the proportional transformer, the output line of the sampling resistor and the output line of the phase comparator are respectively connected with the input end of a digital acquisition card of a computer, the tail end of the primary side first winding of the proportional transformer is connected with the ground, the tail end of the primary side second winding of the proportional transformer is connected with the ground, and the connecting end of the current transformer and the sampling resistor is connected with the ground;
the alternating current source is used for providing alternating current power supply;
the large-section cable conductor is used as a conductor to be tested;
the proportional transformer comprises a primary side first winding of the proportional transformer, a primary side second winding of the proportional transformer and a secondary side winding of the proportional transformer, and is used for generating voltage;
the current transformer is used for coupling the current of the main loop to a secondary winding loop formed by an adjustable capacitor and a sampling resistor;
the adjustable capacitor is used for outputting voltage through adjusting the secondary winding of the proportional transformerOutput voltage of sampling resistor +.>Same phase;
the sampling resistor is used for sampling the voltage;
the phase comparator is used for comparing phases;
the differential amplifier A is used for amplifying alternating current signals;
the differential amplifier B is used for amplifying alternating current signals;
the output line of the proportional transformer, the output line of the sampling resistor and the output line of the phase comparator are used for being connected with the input end of the computer digital acquisition card, and acquiring and storing voltage, current and phase comparison signals in the test loop in real time.
A large-section cable conductor alternating-current equivalent resistance testing method based on a proportional transformer comprises the following steps:
step S1, obtaining an alternating-current equivalent resistance R of a large-section cable conductor x Voltage of equivalent inductance L x Is a voltage of (2);
step S2, solving voltages at two ends of a capacitor of the adjustable capacitor and sampling voltages at two ends of a resistor of the resistor;
step S3, solving the voltage of the secondary winding of the proportional transformer;
step S4, through step S1, step S2 and step S3, the ac equivalent resistance of the large-section cable conductor is obtained.
Further, the step S1 is implemented as follows:
sinusoidal current of angular frequency omega output at AC current sourceUnder the action, the alternating-current equivalent resistance R of the large-section cable conductor x Is defined by the voltage formula:
in the formula (1):is an alternating current equivalent resistor R x Voltage on>Is sinusoidalCurrent, R x The alternating-current equivalent resistance of the cable conductor with a large section;
equivalent inductance L x Is defined by the voltage formula:
in the formula (2):is equivalent to inductance L x The voltage at ω is the output angular frequency, L x Is equivalent inductance->Is a sinusoidal current.
Further, the step S2 is implemented as follows:
under the action of coupling coefficient k of current transformer, current in secondary winding loop of current transformerThe voltage formula across the capacitance of the adjustable capacitor:
in the formula (3):is the voltage across the capacitance of the adjustable capacitor, k is the coupling coefficient, < >>The current is sinusoidal, omega is the output angular frequency, and C is the capacitance;
generating a voltage across the resistor of the sampling resistor, the voltage formula:
in the formula (4):for sampling the voltage across the resistor, k is the coupling coefficient,/-, for the resistor>And the current is sinusoidal, and R is the resistance of the sampling resistor.
Further, the step S3 is implemented as follows:
the voltage across the adjustable capacitor and the voltage across the primary side second winding of the proportional transformer are
The turns ratio of the primary side first winding of the proportional transformer and the primary side second winding of the proportional transformer to the secondary side winding (33) of the proportional transformer is n, the primary side first winding of the proportional transformer and the primary side second winding of the proportional transformer generate voltage on the secondary side winding of the proportional transformer through electromagnetic coupling, and the voltage formula is as follows:
in formula (5):for the secondary winding voltage of the proportional transformer, n is the turns ratio, < >>Is an alternating current equivalent resistor R x Voltage on>Is equivalent to inductance L x Voltage on>Is the voltage across the primary side second winding of the proportional transformer.
Further, in the step S4, an embodiment is:
the secondary winding of the proportional transformer outputs voltage by adjusting the adjustable capacitorOutput voltage of sampling resistor +.>In phase, i.e. voltage of secondary winding of proportional transformer +.>Middle->The component is zero, and the alternating-current equivalent resistance of the large-section cable conductor is as follows:
in formula (6): r is R x Is an ac equivalent resistance, and is a high-voltage power supply,is an alternating current equivalent resistor R x Voltage on>Is sinusoidal current, +.>Is the voltage of the secondary winding of the proportional transformer, n is the turns ratio, k is the coupling coefficient, R is the resistance of the sampling resistor, +.>The voltage across the resistor of the resistor is sampled.
The beneficial effects of the invention are as follows:
1. the principle is simple and easy to realize.
2. The resistive voltage component and the inductive voltage component in the large-section cable conductor can be separated only by adjusting the adjustable capacitor.
3. The resistive voltage component in the large-section cable conductor is amplified through the proportional transformer, so that the measurement precision and the anti-interference performance can be improved, and the parameter values of the alternating current equivalent resistance and the equivalent inductance of the large-section cable conductor can be obtained simultaneously.
Drawings
FIG. 1 is a schematic diagram of a system and method for testing the alternating current equivalent resistance of a large-section cable conductor based on a proportional transformer;
in the figure: 1. an alternating current source; 2. a large section cable conductor; 3. a proportional transformer; 31. primary side first winding of proportional transformer; 32. primary side second winding of proportional transformer; 33. secondary windings of the proportional transformer; 4. a current transformer; 5. an adjustable capacitor; 6. sampling a resistor; 7. a phase comparator; 8. a differential amplifier A; 9. a differential amplifier B; 10. a proportional transformer output line; 11. sampling a resistor output line; 12. phase comparator output line.
Detailed Description
As shown in fig. 1, the present embodiment includes: the alternating current source 1, the large-section cable conductor 2, the proportional transformer 3 and the proportional transformer 3 comprise a primary side first winding 31 of the proportional transformer, a primary side second winding 32 of the proportional transformer, a secondary side winding 33 of the proportional transformer, a current transformer 4, an adjustable capacitor 5, a sampling resistor 6, a phase comparator 7, a differential amplifier A8, a differential amplifier B9, a proportional transformer output line 10, a sampling resistor output line 11 and a phase comparator output line 12.
The alternating current source 1 and the large-section cable conductor 2 form a main loop, two input ends of the differential amplifier A8 are respectively connected with the head end and the tail end of the large-section cable conductor 2, the output end of the differential amplifier A8 is connected with the head end of a primary side first winding 31 of the proportional transformer, the current transformer 4 couples the current of the main loop to a secondary side winding loop formed by connecting an adjustable capacitor 5 and a sampling resistor 6, two ends of the current transformer 4 are respectively connected with one end of the adjustable capacitor 5 and one end of the sampling resistor 6, the input end of the differential amplifier B9 is respectively connected with the head end and the tail end of the adjustable capacitor 5, the output end of the differential amplifier B9 is respectively connected with the head end of a primary side second winding 32 of the proportional transformer, the input end of the phase comparator 7 is respectively connected with a proportional transformer output line 10 and a sampling resistor output line 11, the proportional transformer output line 10 is connected with a secondary side winding 33 of the proportional transformer, the sampling resistor output line 11 and the phase comparator output line 12 are respectively connected with the input end of a computer digital acquisition card, the tail end of the primary side first winding 31 of the proportional transformer is connected with the ground, and the tail end of the primary side of the proportional transformer is connected with the sampling resistor 4 and the tail end of the sampling resistor is connected with the ground.
The alternating current source 1 is used for providing alternating current power;
the large-section cable conductor 2 is used as a conductor to be tested;
the proportional transformer 3 comprises a primary side first winding 31 of the proportional transformer, a primary side second winding 32 of the proportional transformer and a secondary side winding 33 of the proportional transformer, and is used for generating voltage;
the current transformer 4 is used for coupling the current of the main loop to a secondary winding loop formed by an adjustable capacitor 5 and a sampling resistor 6;
the adjustable capacitor 5 is used for outputting voltage through adjusting the secondary winding 33 of the proportional transformerOutput voltage of sampling resistor 6>Same phase;
the sampling resistor 6 is used for sampling the voltage;
the phase comparator 7 is used for comparing phases;
the differential amplifier A8 is used for amplifying alternating current signals;
the differential amplifier B9 is used for amplifying alternating current signals;
the proportional transformer output line 10, the sampling resistor output line 11 and the phase comparator output line 12 are used for being connected with the input end of a computer digital acquisition card, and acquiring and storing voltage, current and phase comparison signals in a test loop in real time.
The implementation process of the embodiment is as follows:
the test circuit mainly comprises an alternating current source 1, a large-section cable conductor 2, a proportional transformer 3, a current transformer 4, an adjustable capacitor 5, a sampling resistor 6, a phase comparator 7 and the like.
The alternating current source 1 and the large-section cable conductor 2 form a main loop. Sinusoidal current of angular frequency omega is output at ac current source 1Under the action, the alternating-current equivalent resistance R of the large-section cable conductor x The upper voltage formula:
in the formula (1):is equivalent to resistance R x Voltage on>Is sinusoidal current, R x Is the alternating current equivalent resistance of the cable conductor with large cross section.
Equivalent inductance L x The upper voltage formula:
in the formula (2):is equivalent to inductance L x The voltage across the resistor is applied to the resistor,omega is the output angular frequency, L x Is equivalent inductance->Is a sinusoidal current.
The two input ends of the differential amplifier A8 are respectively connected with the head end and the tail end of the large-section cable conductor 2 to obtain the voltage at the two ends of the large-section cable conductor, and the voltage formula is as follows:
in the formula (3):for the voltage across the large-section cable conductor, +.>Is equivalent to resistance R x Voltage on>Is equivalent to inductance L x And a voltage on the same.
The output end of the differential amplifier A8 is connected with the head end of the primary side first winding 31 of the proportional transformer. The voltage across the primary side first winding 31 of the proportional transformer is
The current transformer 4 couples the current of the main loop to the secondary winding loop consisting of the adjustable capacitor 5 and the sampling resistor 6. Under the action of the coupling coefficient k of the current transformer 4, the current in the secondary winding loop of the current transformer 4A voltage equation is generated across the capacitance of the tunable capacitor 5:
in the formula (4):for the voltage across the capacitance of the adjustable capacitor 5, k is the coupling coefficient, < >>Is sinusoidal current, ω is output angular frequency, and C is capacitance.
A voltage is generated across the resistor of the sampling resistor 6, the voltage formula:
in formula (5):for sampling the voltage across the resistor 6, k is the coupling coefficient, +.>Is a sinusoidal current, and R is the resistance of the sampling resistor 6.
The input end of the differential amplifier B9 is respectively connected with the head end and the tail end of the adjustable capacitor 5 to obtain the voltage of the two ends of the adjustable capacitor 5 asThe output of the differential amplifier B9 is connected to the primary second winding 32 of the proportional transformer. The voltage across the primary secondary winding 32 of the proportional transformer is +.>
The turns ratio of the primary side first winding 31 of the proportional transformer and the primary side second winding 32 of the proportional transformer to the secondary side winding 33 of the proportional transformer is n, the primary side first winding 31 of the proportional transformer and the primary side second winding 32 of the proportional transformer generate voltage on the secondary side winding 33 of the proportional transformer through electromagnetic coupling, and the voltage formula is as follows:
in formula (6):for the secondary winding 33 voltage of the proportional transformer, n is the turns ratio, +.>Is equivalent to resistance R x Voltage on>Is equivalent to inductance L x Voltage on>Is the voltage across the primary secondary winding 32 of the proportional transformer.
The input end of the phase comparator 7 is respectively connected with the output line 10 of the proportional transformer and the output line 11 of the sampling resistor, and the secondary winding 33 of the proportional transformer outputs voltage by adjusting the adjustable capacitor 5Output voltage of sampling resistor 6>In phase, i.e. the voltage of the secondary winding 33 of the proportional transformer +.>Middle->The component is zero, and the alternating-current equivalent resistance of the large-section cable conductor is as follows:
in the formula (7): r is R x Is an ac equivalent resistance, and is a high-voltage power supply,is equivalent to resistance R x Voltage on>Is sinusoidal current, +.>Is the voltage of the secondary winding 33 of the proportional transformer, n is the turns ratio, k is the coupling coefficient, R is the resistance of the sampling resistor 6 +.>The voltage across the resistor 6 is sampled.
Meanwhile, the equivalent inductance of the cable conductor with the large section can be calculated as follows:
in formula (8): l (L) x Is equivalent inductance, k is coupling coefficient, ω is output angular frequency, and C is capacitance.
The output line 10 of the proportional transformer, the output line 11 of the sampling resistor and the output line 12 of the phase comparator are respectively connected with the input end of the digital acquisition card of the computer, and the voltage, the current and the phase comparison signals in the test loop are acquired and stored in real time.
The types of alternating current sources that may be used in the embodiments are: NHAC10V-100A of Jinan Nenghua electromechanical device Co., ltd, differential amplifier model is: the model of the current transformer is 815A of Nanjing hongbin weak signal detection Co., ltd: CTA200 of Shenzhen City is known from electronic Co., ltd, and the model of the digital acquisition card is: NI USB6009.
Claims (6)
1. A large-section cable conductor alternating current equivalent resistance test system based on a proportional transformer is characterized by comprising: the alternating current source (1), the large-section cable conductor (2), the proportional transformer (3) and the proportional transformer (3) comprise a primary side first winding (31) of the proportional transformer, a primary side second winding (32) of the proportional transformer, a secondary side winding (33) of the proportional transformer, a current transformer (4), an adjustable capacitor (5), a sampling resistor (6), a phase comparator (7), a differential amplifier A (8), a differential amplifier B (9), a proportional transformer output line (10), a sampling resistor output line (11) and a phase comparator output line (12);
the alternating current source (1) is connected with the large-section cable conductor (2), two input ends of the differential amplifier A (8) are respectively connected with the head end and the tail end of the large-section cable conductor (2), the output end of the differential amplifier A (8) is connected with the head end of a primary side first winding (31) of the proportional transformer, the current transformer (4) couples the current of a main loop to a secondary side winding loop formed by connecting an adjustable capacitor (5) and a sampling resistor (6), two ends of the current transformer (4) are respectively connected with one end of the adjustable capacitor (5) and one end of the sampling resistor (6), the input end of the differential amplifier B (9) is respectively connected with the head end and the tail end of the adjustable capacitor (5), the output end of the differential amplifier B (9) is respectively connected with the head end of a primary side second winding (32) of the proportional transformer, the input end of the phase comparator (7) is respectively connected with an output line (10) of the proportional transformer and an output line (11) of the sampling resistor, the proportional transformer (10) is connected with a secondary side winding (33) of the proportional transformer, the output line (10) and the output line (11) of the proportional transformer is connected with the primary side of the proportional transformer and the primary side second winding (32) of the proportional transformer respectively, the connecting end of the current transformer (4) and the sampling resistor (6) is connected with the ground;
the alternating current source (1) is used for providing alternating current power;
the large-section cable conductor (2) is used as a conductor to be tested;
the proportional transformer (3) comprises a primary side first winding (31) of the proportional transformer, a primary side second winding (32) of the proportional transformer and a secondary side winding (33) of the proportional transformer, and is used for generating voltage;
the current transformer (4) is used for coupling the current of the main loop to a secondary winding loop formed by an adjustable capacitor (5) and a sampling resistor (6);
the adjustable capacitor (5) is used for outputting voltage through adjusting the secondary winding (33) of the proportional transformerOutput voltage +.>Same phase;
the sampling resistor (6) is used for sampling voltage;
-said phase comparator (7) for comparing phases;
-said differential amplifier a (8) for amplifying an ac signal;
-said differential amplifier B (9) for amplifying an ac signal;
the proportional transformer output line (10), the sampling resistor output line (11) and the phase comparator output line (12) are used for being connected with the input end of the computer digital acquisition card, and acquiring and storing voltage, current and phase comparison signals in the test loop in real time.
2. A method for testing the alternating-current equivalent resistance of a large-section cable conductor based on a proportional transformer is characterized by comprising the following steps:
step S1, obtaining the alternating-current equivalent resistance R of the large-section cable conductor (2) x Voltage of equivalent inductance L x Is a voltage of (2);
step S2, obtaining voltages at two ends of a capacitor of the adjustable capacitor (5), and sampling voltages at two ends of a resistor of the resistor (6);
step S3, calculating the voltage of a secondary winding (33) of the proportional transformer;
step S4, through step S1, step S2 and step S3, the alternating current equivalent resistance of the large-section cable conductor (2) is obtained.
3. The method for testing the ac equivalent resistance of the large-section cable conductor based on the proportional transformer according to claim 2, wherein the implementation mode of the step S1 is as follows:
sinusoidal current of angular frequency omega is output at an alternating current source (1)Under the action, the alternating-current equivalent resistance R of the large-section cable conductor (2) x Is defined by the voltage formula:
in the formula (1):is an alternating current equivalent resistor R x Voltage on>Is sinusoidal current, R x The alternating-current equivalent resistance of the cable conductor (2) with a large section is achieved;
equivalent inductance L x Is defined by the voltage formula:
in the formula (2):is equivalent to inductance L x The voltage at ω is the output angular frequency, L x Is equivalent inductance->Is a sinusoidal current.
4. The method for testing the ac equivalent resistance of the large-section cable conductor based on the proportional transformer according to claim 2, wherein the implementation mode of the step S2 is as follows:
under the action of a coupling coefficient k of the current transformer (4), the current in a secondary winding loop of the current transformer (4)The voltage formula across the capacitance of the adjustable capacitor (5):
in the formula (3):is the voltage across the capacitor of the adjustable capacitor (5), k is the coupling coefficient, +.>The current is sinusoidal, omega is the output angular frequency, and C is the capacitance;
generating a voltage across the resistor of the sampling resistor (6), the voltage formula:
in the formula (4):for sampling the voltage across the resistor (6), k is the coupling coefficient, +.>And R is the resistance of the sampling resistor (6) and is a sine current.
5. The method for testing the ac equivalent resistance of the large-section cable conductor based on the proportional transformer according to claim 2, wherein the implementation manner of the step S3 is as follows:
the voltage across the adjustable capacitor (5) and the voltage across the primary side second winding (32) of the proportional transformer are
The turns ratio of the primary side first winding (31) of the proportional transformer and the primary side second winding (32) of the proportional transformer to the secondary side winding (33) of the proportional transformer is n, the primary side first winding (31) of the proportional transformer and the primary side second winding (32) of the proportional transformer generate voltage on the secondary side winding (33) of the proportional transformer through electromagnetic coupling, and the voltage formula is as follows:
in formula (5):is the secondary winding (33) voltage of the proportional transformer, n is the turns ratio, +.>Is an alternating current equivalent resistor R x Voltage on>Is equivalent to inductance L x Voltage on>Is the voltage across the primary secondary winding (32) of the proportional transformer.
6. The method for testing the ac equivalent resistance of the large-section cable conductor based on the proportional transformer according to claim 2, wherein the implementation manner of the step S4 is as follows:
the secondary winding (33) of the proportional transformer outputs a voltage by adjusting the adjustable capacitor (5)Output voltage +.>In phase, i.e. the voltage of the secondary winding (33) of the proportional transformer +.>Middle->The component is zero, and the alternating-current equivalent resistance of the large-section cable conductor (2) is as follows:
in formula (6): r is R x Is an ac equivalent resistance, and is a high-voltage power supply,is an alternating current equivalent resistor R x Voltage on>Is sinusoidal current, +.>Is the voltage of the secondary winding (33) of the proportional transformer, n is the turns ratio, k is the coupling coefficient, R is the resistance of the sampling resistor (6), and +.>The voltage across the resistor of the resistor (6) is sampled.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1367900A (en) * | 1971-06-30 | 1974-09-25 | Inst Elektrodinamiki Akademii | Apparatus for measuring two parameters of impedances |
| WO1999005533A2 (en) * | 1997-07-23 | 1999-02-04 | Pirelli Cavi E Sistemi S.P.A. | System for measuring the alternating current equivalent series resistance of a conductor |
| CN111505357A (en) * | 2020-04-02 | 2020-08-07 | 江苏省送变电有限公司 | Power supply for testing electrical characteristic parameters of large-section conductor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1367900A (en) * | 1971-06-30 | 1974-09-25 | Inst Elektrodinamiki Akademii | Apparatus for measuring two parameters of impedances |
| WO1999005533A2 (en) * | 1997-07-23 | 1999-02-04 | Pirelli Cavi E Sistemi S.P.A. | System for measuring the alternating current equivalent series resistance of a conductor |
| CN111505357A (en) * | 2020-04-02 | 2020-08-07 | 江苏省送变电有限公司 | Power supply for testing electrical characteristic parameters of large-section conductor |
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| Title |
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| 高频效应对无线电能传输系统的影响研究;强浩;陈琛;刘柏良;施泽群;马旭;司政;;常州大学学报(自然科学版)(06);全文 * |
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