CN113092868A - Resistance measuring method, device, system, equipment and storage medium - Google Patents
Resistance measuring method, device, system, equipment and storage medium Download PDFInfo
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- CN113092868A CN113092868A CN202110217145.7A CN202110217145A CN113092868A CN 113092868 A CN113092868 A CN 113092868A CN 202110217145 A CN202110217145 A CN 202110217145A CN 113092868 A CN113092868 A CN 113092868A
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- 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
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
- G01R27/06—Measuring reflection coefficients; Measuring standing-wave ratio
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Abstract
The application relates to a resistance measurement method, a device, a system, equipment and a storage medium. The method comprises the following steps: under the condition that measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through a voltage measuring device; under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through a voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop; and determining an initial current of the first measuring loop and a commutation current of the second measuring loop, and determining a resistance value of the low-voltage winding delta-phase resistance based on the initial current, the commutation current, the initial voltage and the commutation voltage. The method can be used for safely and accurately measuring the phase resistance of the low-voltage winding.
Description
Technical Field
The present application relates to the field of power grid technologies, and in particular, to a method, an apparatus, a system, a device, and a storage medium for measuring resistance.
Background
The transformer has wide application range, and can be used as a power transformer and as a small electronic element. The low-voltage winding, as the winding with the lowest rated voltage value, is an important component of the transformer.
The method has the advantages that the phase resistance of the low-voltage winding of the transformer is measured, and data parameters such as the welding quality of a lead inside the low-voltage winding, the welding quality of a lead and the low-voltage winding, whether the specification of the lead used by the low-voltage winding meets the design requirement and the like can be tested, so that the method has important significance on the safe operation of the transformer.
Therefore, how to safely and accurately measure the phase resistance of the low-voltage winding becomes a problem to be solved urgently at present.
Disclosure of Invention
In view of the above, it is necessary to provide a resistance measurement method, device, system, apparatus, and storage medium capable of safely and accurately measuring the phase resistance of a low-voltage winding.
In a first aspect, an embodiment of the present application provides a resistance measurement method, which is used for a measurement device, where the measurement device is used to form a measurement loop by being connected to a low-voltage winding delta-phase resistor, the low-voltage winding delta-phase resistor is connected in parallel to a voltage measurement device and a discharge protection device, the voltage measurement device is connected in parallel to the discharge protection device, and the discharge protection device is used to perform shunt protection on the voltage measurement device in a current phase change process, where the method includes:
under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device;
under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through the voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop;
determining an initial current of the first measurement loop and a commutation current of the second measurement loop, and determining a resistance value of the low-voltage winding delta phase resistance based on the initial current, the commutation current, the initial voltage, and the commutation voltage.
In one embodiment, the obtaining of the initial voltage across the low-voltage winding triangular phase resistor includes:
acquiring a first initial voltage at two ends of the first phase resistor, a second initial voltage at two ends of the second phase resistor and a third initial voltage at two ends of the third phase resistor through the voltage measuring device;
determining the first initial voltage, the second initial voltage, and the third initial voltage as the initial voltages.
In one embodiment, the low-voltage winding delta-phase resistor includes a first-phase resistor, a second-phase resistor and a third-phase resistor, the first-phase resistor and the third-phase resistor are connected in series to form a second series resistor, the second-phase resistor and the second series resistor are connected in parallel, and after being connected in parallel, the second series resistor and the measuring device are connected to form the second measuring loop, and the obtaining of the commutation voltage across the low-voltage winding delta-phase resistor by the voltage measuring device includes:
acquiring a first phase-change voltage at two ends of the first phase resistor, a second phase-change voltage at two ends of the second phase resistor and a third phase-change voltage at two ends of the third phase resistor through the voltage measuring device;
determining the first commutation voltage, the second commutation voltage, and the third commutation voltage as the commutation voltage.
In one embodiment, the voltage measuring device comprises a first voltage measuring device, a second voltage measuring device and a third voltage measuring device;
the first voltage measuring device is connected with the first phase resistor in parallel and used for measuring the voltage at two ends of the first phase resistor; the second voltage measuring device is connected in parallel with the second phase resistor, and the second voltage measuring device is used for measuring the voltage across the second phase resistor; the third voltage measuring device is connected with the third phase resistor in parallel and is used for measuring the voltage at two ends of the third phase resistor;
the discharge protection device is connected in parallel with at least one of the first voltage measurement device, the second voltage measurement device, and the third voltage measurement device.
In one embodiment, the discharge protection device comprises a first discharge protection device, a second discharge protection device and a third discharge protection device;
the first discharge protection device is connected in parallel with the first voltage measurement device, the second discharge protection device is connected in parallel with the second voltage measurement device, and the third discharge protection device is connected in parallel with the third voltage measurement device.
In a second aspect, an embodiment of the present application provides a resistance measurement device, which is disposed in a measurement device, the measurement device is used to form a measurement loop by connecting with a low-voltage winding delta phase resistor, the low-voltage winding delta phase resistor is connected with a voltage measurement device and a discharge protection device in parallel, the voltage measurement device is connected with the discharge protection device in parallel, the discharge protection device is used to shunt and protect the voltage measurement device during a current commutation process, and the device includes:
the first obtaining module is used for obtaining initial voltages at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop;
the second obtaining module is used for obtaining commutation voltage at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, and the second measuring loop is obtained by carrying out current commutation on the first measuring loop;
the determining module is used for determining an initial current of the first measuring loop and a commutation current of the second measuring loop and determining a resistance value of the low-voltage winding delta-phase resistor based on the initial current, the commutation current, the initial voltage and the commutation voltage.
In a third aspect, an embodiment of the present application provides a resistance measurement system, where the system includes a measurement device and a low-voltage winding delta-phase resistor, the measurement device is used to connect with the low-voltage winding delta-phase resistor to form a measurement loop, the low-voltage winding delta-phase resistor is connected in parallel with a voltage measurement device and a discharge protection device, the voltage measurement device is connected in parallel with the discharge protection device, the discharge protection device is used to perform shunt protection on the voltage measurement device in a current phase change process, and the measurement device is used to perform the resistance measurement method according to the first aspect described above, so as to measure a resistance value of the low-voltage winding delta-phase resistor.
In one embodiment, the low-voltage winding triangular phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor;
the voltage measuring device comprises a first voltage measuring device, a second voltage measuring device and a third voltage measuring device; the first voltage measuring device is connected with the first phase resistor in parallel, the second voltage measuring device is connected with the second phase resistor in parallel, and the third voltage measuring device is connected with the third phase resistor in parallel;
the discharge protection device comprises a first discharge protection device, a second discharge protection device and a third discharge protection device; the first discharge protection device is connected in parallel with the first voltage measurement device, the second discharge protection device is connected in parallel with the second voltage measurement device, and the third discharge protection device is connected in parallel with the third voltage measurement device.
In a fourth aspect, an embodiment of the present application provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method according to the first aspect when executing the computer program.
In a fifth aspect, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the method according to the first aspect as described above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the resistance measuring method, the device, the system, the equipment and the storage medium are characterized in that the measuring equipment is connected with a low-voltage winding delta-phase resistor to form a measuring loop, the low-voltage winding delta-phase resistor is connected with a voltage measuring device and a discharge protection device in parallel, the voltage measuring device is connected with the discharge protection device in parallel, and the discharge protection device is used for providing a discharge channel in the current commutation process to carry out shunt protection on the voltage measuring device; under the condition that measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through a voltage measuring device; under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through a voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop; the initial current of the first measuring loop and the commutation current of the second measuring loop are determined, and the resistance value of the low-voltage winding triangular phase resistor is determined based on the initial current, the commutation current, the initial voltage and the commutation voltage, so that the safety of the voltage measuring device is ensured, and meanwhile, the accurate measurement of the resistance value of the low-voltage winding triangular phase resistor is realized.
Drawings
FIG. 1 is a diagram of an exemplary implementation environment for a resistance measurement method;
FIG. 2 is a schematic flow chart of a resistance measurement method in one embodiment;
FIG. 3 is a schematic flow chart of a resistance measurement method in another embodiment;
FIG. 4 is a schematic diagram of an exemplary first measurement circuit;
FIG. 5 is a schematic diagram of an equivalent circuit of the first measurement loop shown in FIG. 4;
FIG. 6 is a schematic diagram of another exemplary first measurement circuit;
FIG. 7 is a schematic equivalent circuit diagram of the first measurement loop shown in FIG. 6;
FIG. 8 is a schematic diagram of an exemplary second measurement circuit;
FIG. 9 is a block diagram showing the structure of a resistance measuring device according to an embodiment;
FIG. 10 is a diagram showing an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The resistance measuring method, device, system, equipment and storage medium provided by the embodiment of the application aim to realize safe and accurate measurement of the phase resistance of the low-voltage winding of the transformer. The following describes in detail the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems by embodiments and with reference to the drawings. The following specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The resistance measurement method provided by the embodiment of the application can be applied to an implementation environment shown in fig. 1, and as shown in fig. 1, the implementation environment may include a measurement device 101 and a low-voltage winding delta phase resistance 102.
The measuring device 101 is used for being connected with a low-voltage winding triangular phase resistor 102 to form a measuring loop, the low-voltage winding triangular phase resistor 102 is connected with a voltage measuring device 103 and a discharge protection device 104 in parallel, the voltage measuring device 103 is connected with the discharge protection device 104 in parallel, and the discharge protection device 104 is used for shunting protection on the voltage measuring device 103 in a current commutation process. Alternatively, the voltage measuring device 103 may be a voltmeter, the discharge protection device 104 may be an arrester, and so on.
In one embodiment, as shown in fig. 2, a resistance measurement method is provided, which is exemplified by the method applied to the measurement apparatus in fig. 1, and includes the following steps:
In the embodiment of the application, the low-voltage winding triangular phase resistor can be a low-voltage winding of any type of transformer. Under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor through the bus to form a first measuring loop, the measuring equipment outputs a constant current, namely constant current is injected into the first measuring loop, and then the measuring equipment measures the current voltage at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device to obtain initial voltage.
After the measuring equipment measures and obtains initial voltages at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device, the measuring equipment carries out current phase change on the first measuring loop to obtain a second measuring loop, and the current phase change refers to changing of a flowing path of current in the measuring loop.
Under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor through the bus to form a second measuring loop, the measuring equipment outputs constant current, namely constant current is injected into the second measuring loop, and then the measuring equipment measures the current voltage at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device to obtain commutation voltage.
In the embodiment of the application, the measurement loop can further comprise capacitive devices such as capacitors, in the current commutation process, the low-voltage winding triangular phase resistor and the capacitive devices can discharge the residual stored charges in the first measurement loop firstly, and can store the charges again when being switched to the second measurement loop, so that the voltage measurement device and the discharge protection device are connected in parallel, and in the discharge process, the discharge protection device can provide a discharge channel, namely the discharge protection device can share the risk that the voltage measurement device is impacted by current, so that the discharge impact resistance of the voltage measurement device is enhanced, the probability of internal damage of the voltage measurement device caused by commutation discharge in the resistance measurement process is reduced, and the measurement safety is improved.
In step 203, the measuring device determines an initial current of the first measuring loop and a commutation current of the second measuring loop, and determines a resistance value of the delta phase resistance of the low-voltage winding based on the initial current, the commutation current, the initial voltage and the commutation voltage.
The initial current is constant current injected into the first measuring loop by the measuring equipment under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor through the bus to form the first measuring loop; the commutation current is constant current injected into the second measuring loop by the measuring equipment under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor through the bus to form the second measuring loop.
And the measuring equipment substitutes the initial current, the commutation current, the initial voltage and the commutation voltage into a preset formula to calculate the direct current resistance value of the low-voltage winding triangular phase resistor.
The measuring equipment is used for being connected with a low-voltage winding delta-phase resistor to form a measuring loop, the low-voltage winding delta-phase resistor is connected with a voltage measuring device and a discharge protection device in parallel, the voltage measuring device is connected with the discharge protection device in parallel, and the discharge protection device is used for providing a discharge channel in the current commutation process to carry out shunt protection on the voltage measuring device; under the condition that measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through a voltage measuring device; under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through a voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop; the initial current of the first measuring loop and the commutation current of the second measuring loop are determined, and the resistance value of the low-voltage winding triangular phase resistor is determined based on the initial current, the commutation current, the initial voltage and the commutation voltage, so that the safety of the voltage measuring device is ensured, and meanwhile, the accurate measurement of the resistance value of the low-voltage winding triangular phase resistor is realized.
Based on the embodiment shown in fig. 2 described above, referring to fig. 3, the present embodiment provides another resistance measurement method. In this embodiment, the low-voltage winding triangular phase resistor includes a first phase resistor, a second phase resistor, and a third phase resistor, and as shown in fig. 3, the measuring device may execute step 2011 to implement the process of step 201:
in step 2011, when the second phase resistor and the third phase resistor are connected in series to form a first series resistor, the first phase resistor and the first series resistor are connected in parallel, and the first series resistor and the measuring device are connected after being connected in parallel to form a first measuring loop, the measuring device obtains a first initial voltage at two ends of the first phase resistor, a second initial voltage at two ends of the second phase resistor and a third initial voltage at two ends of the third phase resistor through the voltage measuring device, and determines the first initial voltage, the second initial voltage and the third initial voltage as initial voltages.
In one possible embodiment, the voltage measuring device comprises a first voltage measuring device, a second voltage measuring device and a third voltage measuring device; the first voltage measuring device is connected with the first phase resistor in parallel and used for measuring the voltage at two ends of the first phase resistor; the second voltage measuring device is connected with the second phase resistor in parallel and is used for measuring the voltage at two ends of the second phase resistor; and the third voltage measuring device is connected with the third-phase resistor in parallel and is used for measuring the voltage at two ends of the third-phase resistor.
Referring to fig. 4, fig. 4 is a schematic diagram of an exemplary first measurement circuit. The initial current of the first measurement loop is constantly output by the measurement equipment through a bus A, and one path of the initial current flows through the first phase resistor and then returns to the measurement equipment through a bus B; the other path of the initial current firstly flows through the third phase resistor, then flows through the second phase resistor and finally returns to the measuring equipment through the bus B.
Referring to fig. 5, fig. 5 is an equivalent circuit schematic diagram of fig. 4. The second-phase resistor and the third-phase resistor are connected in series to form a first series resistor, then the first-phase resistor and the first series resistor are connected in parallel, and the first-phase resistor and the first series resistor are connected in parallel and then connected with the measuring equipment to form a first measuring loop.
Therefore, the measuring equipment obtains the first initial voltage at two ends of the first phase resistor through the first voltage measuring device, obtains the second initial voltage at two ends of the second phase resistor through the second voltage measuring device, and obtains the third initial voltage at two ends of the third phase resistor through the third voltage measuring device, so that the initial voltage is obtained.
It should be noted that, in the embodiment of the present application, a discharge protection device (not shown in fig. 4 and 5) is connected in parallel with at least one of the first voltage measurement device, the second voltage measurement device, and the third voltage measurement device, so as to perform discharge protection on at least one of the first voltage measurement device, the second voltage measurement device, and the third voltage measurement device.
In one possible embodiment, referring to fig. 6, fig. 6 is a schematic view of another exemplary first measurement circuit. The discharge protection device comprises a first discharge protection device, a second discharge protection device and a third discharge protection device; the first discharge protection device is connected with the first voltage measuring device in parallel, the second discharge protection device is connected with the second voltage measuring device in parallel, and the third discharge protection device is connected with the third voltage measuring device in parallel. Referring to fig. 7, fig. 7 is an equivalent circuit schematic diagram of fig. 6.
Therefore, the safety of each voltage measuring device can be improved by connecting each voltage measuring device in parallel with the corresponding discharge protection device, so that the voltage measuring devices are better protected.
With continued reference to fig. 3, the measuring device may perform step 2021 to implement the process of step 202:
And the measuring equipment switches the current applied to the bus A and the bus B into the current applied to the bus B and the bus C, so that the current commutation is realized.
Referring to fig. 8, fig. 8 is a schematic diagram of an exemplary second measurement circuit. The commutation current of the second measurement loop is constantly output by the measurement equipment through the bus B, and one path of the commutation current flows through the second phase resistor and then returns to the measurement equipment through the bus C; the other path of the phase-change current firstly flows through the first phase resistor, then flows through the third phase resistor and finally returns to the measuring equipment through the bus C.
Therefore, the measuring equipment can obtain the first phase-change voltage at two ends of the first phase resistor through the first voltage measuring device, obtain the second phase-change voltage at two ends of the second phase resistor through the second voltage measuring device, and obtain the third phase-change voltage at two ends of the third phase resistor through the third voltage measuring device, so that the phase-change voltage is obtained.
In the following, a description is given of how the measuring device determines the resistance value of the delta-phase resistance of the low-voltage winding on the basis of the initial current, the commutation current, the initial voltage and the commutation voltage.
Under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, namely the second phase resistor is connected with the third phase resistor in series and is connected with the first phase resistor in parallel after being connected in series, the following formula 1 and formula 2 can be obtained:
wherein, Uax1Is a first initial voltage, U, across a first phase resistorby1Is a second initial voltage, U, across the second phase resistorcz1Is a third initial voltage, R, across a third phase resistoraIs the resistance value of the first phase resistor, RbIs the resistance value of the second phase resistor, RcIs the resistance value of a third phase resistor, I1An initial current of a first measurement loop is injected for the measurement device.
Under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, namely, the first phase resistor is connected with the third phase resistor in series and then connected with the second phase resistor in parallel, the following formula 3 and formula 4 can be obtained:
wherein, Uax2Is a first commutation voltage, U, across a first phase resistorby2Is the second commutation voltage, U, across the second phase resistorcz2Is a third commutation voltage, I, across a third phase resistor2The commutation current of the second measurement loop is injected for the measurement device.
Thus, only R in equations 1-4a、Rb、RcUnknown, the measurement device can calculate R by substituting other known parameters into equations 1-4a、Rb、RcAnd obtaining the resistance value of the low-voltage winding triangular phase resistor.
According to the embodiment, when the measuring equipment finishes shutdown or performs phase change operation after measurement, because the two ends of the voltage measuring device are connected with the discharge protection devices in parallel, the discharge protection devices can actively clamp discharge voltage, so that excessive impact is avoided, personal safety is ensured, a discharge channel can be provided, the voltage measuring device is protected, and the voltage measuring device is connected in parallel without influencing the voltage value measured by the voltage measuring device.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the above-mentioned flowcharts may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or the stages is not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a part of the steps or the stages in other steps.
In one embodiment, as shown in fig. 9, there is provided a resistance measuring device disposed in a measuring apparatus, the measuring apparatus is configured to be connected with a low-voltage winding delta-phase resistor to form a measuring loop, the low-voltage winding delta-phase resistor is connected in parallel with a voltage measuring device and a discharge protection device, the voltage measuring device is connected in parallel with the discharge protection device, the discharge protection device is configured to perform shunt protection on the voltage measuring device during a current commutation process, and the apparatus includes:
the first obtaining module 10 is configured to obtain, by the voltage measuring device, initial voltages at two ends of the low-voltage winding delta-phase resistor when the measuring device is connected to the low-voltage winding delta-phase resistor to form a first measurement loop;
a second obtaining module 20, configured to obtain, by the voltage measurement device, phase-change voltages at two ends of the low-voltage winding delta-phase resistor when the measurement device is connected to the low-voltage winding delta-phase resistor to form a second measurement loop, where the second measurement loop is obtained by performing current phase change on the first measurement loop;
a determining module 30, configured to determine an initial current of the first measurement loop and a commutation current of the second measurement loop, and determine a resistance value of the low-voltage winding delta-phase resistance based on the initial current, the commutation current, the initial voltage, and the commutation voltage.
In one embodiment, the low-voltage winding delta-phase resistor includes a first phase resistor, a second phase resistor and a third phase resistor, the second phase resistor is connected in series with the third phase resistor to form a first series resistor, the first phase resistor is connected in parallel with the first series resistor, and after being connected in parallel, the first phase resistor is connected with the measurement device to form the first measurement loop, and the first obtaining module 10 is specifically configured to obtain, by the voltage measurement device, a first initial voltage across the first phase resistor, a second initial voltage across the second phase resistor and a third initial voltage across the third phase resistor; determining the first initial voltage, the second initial voltage, and the third initial voltage as the initial voltages.
In an embodiment, the low-voltage winding delta phase resistor includes a first phase resistor, a second phase resistor and a third phase resistor, the first phase resistor and the third phase resistor are connected in series to form a second series resistor, the second phase resistor and the second series resistor are connected in parallel, and after being connected in parallel, the second phase resistor and the measuring device are connected to form the second measuring loop, the second obtaining module 20 is specifically configured to obtain, through the voltage measuring device, a first commutation voltage across the first phase resistor, a second commutation voltage across the second phase resistor and a third commutation voltage across the third phase resistor; determining the first commutation voltage, the second commutation voltage, and the third commutation voltage as the commutation voltage.
In one embodiment, the voltage measurement device comprises a first voltage measurement device, a second voltage measurement device, and a third voltage measurement device;
the first voltage measuring device is connected with the first phase resistor in parallel and used for measuring the voltage at two ends of the first phase resistor; the second voltage measuring device is connected in parallel with the second phase resistor, and the second voltage measuring device is used for measuring the voltage across the second phase resistor; the third voltage measuring device is connected with the third phase resistor in parallel and is used for measuring the voltage at two ends of the third phase resistor;
the discharge protection device is connected in parallel with at least one of the first voltage measurement device, the second voltage measurement device, and the third voltage measurement device.
In one embodiment, the discharge protection device includes a first discharge protection device, a second discharge protection device, and a third discharge protection device;
the first discharge protection device is connected in parallel with the first voltage measurement device, the second discharge protection device is connected in parallel with the second voltage measurement device, and the third discharge protection device is connected in parallel with the third voltage measurement device.
For specific limitations of the resistance measuring device, reference may be made to the above limitations of the resistance measuring method, which are not described herein again. The various modules in the resistance measuring device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In an embodiment, a resistance measurement system is provided, where the system includes a measurement device and a low-voltage winding delta-phase resistor, the measurement device is used to connect with the low-voltage winding delta-phase resistor to form a measurement loop, the low-voltage winding delta-phase resistor is connected in parallel with a voltage measurement device and a discharge protection device, the voltage measurement device is connected in parallel with the discharge protection device, the discharge protection device is used to perform shunt protection on the voltage measurement device during current commutation, and the measurement device is used to perform the resistance measurement method of the above embodiment to measure a resistance value of the low-voltage winding delta-phase resistor.
Optionally, the low-voltage winding triangular phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor; the voltage measuring device comprises a first voltage measuring device, a second voltage measuring device and a third voltage measuring device; the first voltage measuring device is connected with the first phase resistor in parallel, the second voltage measuring device is connected with the second phase resistor in parallel, and the third voltage measuring device is connected with the third phase resistor in parallel;
the discharge protection device comprises a first discharge protection device, a second discharge protection device and a third discharge protection device; the first discharge protection device is connected in parallel with the first voltage measurement device, the second discharge protection device is connected in parallel with the second voltage measurement device, and the third discharge protection device is connected in parallel with the third voltage measurement device.
For specific limitations and advantages of the resistance measurement system, reference may be made to the above limitations of the resistance measurement method, which are not described herein again.
In one embodiment, a computer device is provided, which may be a measurement device, the internal structure of which may be as shown in fig. 10. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a resistance measurement method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
under the condition that measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through a voltage measuring device;
under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through a voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop;
and determining an initial current of the first measuring loop and a commutation current of the second measuring loop, and determining a resistance value of the low-voltage winding delta-phase resistance based on the initial current, the commutation current, the initial voltage and the commutation voltage.
In one embodiment, the low-voltage winding triangular phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor, the second phase resistor and the third phase resistor are connected in series to form a first series resistor, the first phase resistor is connected in parallel with the first series resistor and is connected with the measuring equipment after being connected in parallel to form a first measuring loop, and the processor executes the computer program to further realize the following steps:
acquiring a first initial voltage at two ends of a first phase resistor, a second initial voltage at two ends of a second phase resistor and a third initial voltage at two ends of a third phase resistor through a voltage measuring device;
the first initial voltage, the second initial voltage and the third initial voltage are determined as initial voltages.
In one embodiment, the low-voltage winding triangular phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor, the first phase resistor and the third phase resistor are connected in series to form a second series resistor, the second phase resistor and the second series resistor are connected in parallel and then connected with the measuring equipment to form a second measuring loop, and the processor executes the computer program to further realize the following steps:
acquiring a first phase-change voltage at two ends of a first phase resistor, a second phase-change voltage at two ends of a second phase resistor and a third phase-change voltage at two ends of a third phase resistor through a voltage measuring device;
and determining the first commutation voltage, the second commutation voltage and the third commutation voltage as commutation voltages.
In one embodiment, the voltage measurement device comprises a first voltage measurement device, a second voltage measurement device, and a third voltage measurement device;
the first voltage measuring device is connected with the first phase resistor in parallel and used for measuring the voltage at two ends of the first phase resistor; the second voltage measuring device is connected with the second phase resistor in parallel and is used for measuring the voltage at two ends of the second phase resistor; the third voltage measuring device is connected with the third phase resistor in parallel and is used for measuring the voltage at two ends of the third phase resistor;
the discharge protection device is connected in parallel with at least one of the first voltage measurement device, the second voltage measurement device and the third voltage measurement device.
In one embodiment, the discharge protection device includes a first discharge protection device, a second discharge protection device, and a third discharge protection device;
the first discharge protection device is connected with the first voltage measuring device in parallel, the second discharge protection device is connected with the second voltage measuring device in parallel, and the third discharge protection device is connected with the third voltage measuring device in parallel.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
under the condition that measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through a voltage measuring device;
under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through a voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop;
and determining an initial current of the first measuring loop and a commutation current of the second measuring loop, and determining a resistance value of the low-voltage winding delta-phase resistance based on the initial current, the commutation current, the initial voltage and the commutation voltage.
In one embodiment, the low-voltage winding triangular phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor, the second phase resistor and the third phase resistor are connected in series to form a first series resistor, the first phase resistor is connected in parallel with the first series resistor and is connected with the measuring equipment after being connected in parallel to form a first measuring loop, and when the computer program is executed by the processor, the following steps are further realized:
acquiring a first initial voltage at two ends of a first phase resistor, a second initial voltage at two ends of a second phase resistor and a third initial voltage at two ends of a third phase resistor through a voltage measuring device;
the first initial voltage, the second initial voltage and the third initial voltage are determined as initial voltages.
In one embodiment, the low-voltage winding triangular phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor, the first phase resistor and the third phase resistor are connected in series to form a second series resistor, the second phase resistor and the second series resistor are connected in parallel and then connected with the measuring equipment to form a second measuring loop, and when being executed by the processor, the computer program further realizes the following steps:
acquiring a first phase-change voltage at two ends of a first phase resistor, a second phase-change voltage at two ends of a second phase resistor and a third phase-change voltage at two ends of a third phase resistor through a voltage measuring device;
and determining the first commutation voltage, the second commutation voltage and the third commutation voltage as commutation voltages.
In one embodiment, the voltage measurement device comprises a first voltage measurement device, a second voltage measurement device, and a third voltage measurement device;
the first voltage measuring device is connected with the first phase resistor in parallel and used for measuring the voltage at two ends of the first phase resistor; the second voltage measuring device is connected with the second phase resistor in parallel and is used for measuring the voltage at two ends of the second phase resistor; the third voltage measuring device is connected with the third phase resistor in parallel and is used for measuring the voltage at two ends of the third phase resistor;
the discharge protection device is connected in parallel with at least one of the first voltage measurement device, the second voltage measurement device and the third voltage measurement device.
In one embodiment, the discharge protection device includes a first discharge protection device, a second discharge protection device, and a third discharge protection device;
the first discharge protection device is connected with the first voltage measuring device in parallel, the second discharge protection device is connected with the second voltage measuring device in parallel, and the third discharge protection device is connected with the third voltage measuring device in parallel.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A resistance measurement method is characterized by being used for measurement equipment, wherein the measurement equipment is used for being connected with a low-voltage winding delta-phase resistor to form a measurement loop, the low-voltage winding delta-phase resistor is connected with a voltage measurement device and a discharge protection device in parallel, the voltage measurement device is connected with the discharge protection device in parallel, and the discharge protection device is used for shunting protection on the voltage measurement device in a current commutation process, and the method comprises the following steps:
under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop, acquiring initial voltages at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device;
under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, phase-changing voltages at two ends of the low-voltage winding triangular phase resistor are obtained through the voltage measuring device, and the second measuring loop is obtained by carrying out current phase changing on the first measuring loop;
determining an initial current of the first measurement loop and a commutation current of the second measurement loop, and determining a resistance value of the low-voltage winding delta phase resistance based on the initial current, the commutation current, the initial voltage, and the commutation voltage.
2. The method of claim 1, wherein the low-voltage winding delta phase resistance comprises a first phase resistance, a second phase resistance and a third phase resistance, the second phase resistance is connected in series with the third phase resistance to form a first series resistance, the first phase resistance is connected in parallel with the first series resistance and is connected with the measuring device after being connected in parallel to form the first measuring loop, and the obtaining of the initial voltage across the low-voltage winding delta phase resistance comprises:
acquiring a first initial voltage at two ends of the first phase resistor, a second initial voltage at two ends of the second phase resistor and a third initial voltage at two ends of the third phase resistor through the voltage measuring device;
determining the first initial voltage, the second initial voltage, and the third initial voltage as the initial voltages.
3. The method according to claim 1, wherein the low-voltage winding delta phase resistor comprises a first phase resistor, a second phase resistor and a third phase resistor, the first phase resistor is connected with the third phase resistor in series to form a second series resistor, the second phase resistor is connected with the second series resistor in parallel and is connected with the measuring equipment after being connected in parallel to form the second measuring loop, and the obtaining of the commutation voltage across the low-voltage winding delta phase resistor by the voltage measuring device comprises:
acquiring a first phase-change voltage at two ends of the first phase resistor, a second phase-change voltage at two ends of the second phase resistor and a third phase-change voltage at two ends of the third phase resistor through the voltage measuring device;
determining the first commutation voltage, the second commutation voltage, and the third commutation voltage as the commutation voltage.
4. A method according to claim 2 or 3, wherein the voltage measuring devices comprise a first voltage measuring device, a second voltage measuring device and a third voltage measuring device;
the first voltage measuring device is connected with the first phase resistor in parallel and used for measuring the voltage at two ends of the first phase resistor; the second voltage measuring device is connected in parallel with the second phase resistor, and the second voltage measuring device is used for measuring the voltage across the second phase resistor; the third voltage measuring device is connected with the third phase resistor in parallel and is used for measuring the voltage at two ends of the third phase resistor;
the discharge protection device is connected in parallel with at least one of the first voltage measurement device, the second voltage measurement device, and the third voltage measurement device.
5. The method of claim 4, wherein the discharge protection device comprises a first discharge protection device, a second discharge protection device, and a third discharge protection device;
the first discharge protection device is connected in parallel with the first voltage measurement device, the second discharge protection device is connected in parallel with the second voltage measurement device, and the third discharge protection device is connected in parallel with the third voltage measurement device.
6. The utility model provides a resistance measurement device, its characterized in that sets up in measuring equipment, measuring equipment is used for forming measurement circuit with low-voltage winding triangle-shaped looks resistance connection, low-voltage winding triangle-shaped looks resistance connects voltage measurement device and discharge protection device in parallel, voltage measurement device with discharge protection device is parallelly connected, discharge protection device is used for at the current commutation in-process right voltage measurement device carries out the reposition of redundant personnel protection, the device includes:
the first obtaining module is used for obtaining initial voltages at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a first measuring loop;
the second obtaining module is used for obtaining commutation voltage at two ends of the low-voltage winding triangular phase resistor through the voltage measuring device under the condition that the measuring equipment is connected with the low-voltage winding triangular phase resistor to form a second measuring loop, and the second measuring loop is obtained by carrying out current commutation on the first measuring loop;
the determining module is used for determining an initial current of the first measuring loop and a commutation current of the second measuring loop and determining a resistance value of the low-voltage winding delta-phase resistor based on the initial current, the commutation current, the initial voltage and the commutation voltage.
7. A resistance measurement system, comprising a measurement device and a low-voltage winding delta-phase resistor, wherein the measurement device is used for connecting with the low-voltage winding delta-phase resistor to form a measurement loop, the low-voltage winding delta-phase resistor is connected with a voltage measurement device and a discharge protection device in parallel, the voltage measurement device is connected with the discharge protection device in parallel, the discharge protection device is used for performing shunt protection on the voltage measurement device in a current commutation process, and the measurement device is used for executing the resistance measurement method according to any one of claims 1 to 5 so as to measure the resistance value of the low-voltage winding delta-phase resistor.
8. The system of claim 7, wherein the low voltage winding delta phase resistance comprises a first phase resistance, a second phase resistance, and a third phase resistance;
the voltage measuring device comprises a first voltage measuring device, a second voltage measuring device and a third voltage measuring device; the first voltage measuring device is connected with the first phase resistor in parallel, the second voltage measuring device is connected with the second phase resistor in parallel, and the third voltage measuring device is connected with the third phase resistor in parallel;
the discharge protection device comprises a first discharge protection device, a second discharge protection device and a third discharge protection device; the first discharge protection device is connected in parallel with the first voltage measurement device, the second discharge protection device is connected in parallel with the second voltage measurement device, and the third discharge protection device is connected in parallel with the third voltage measurement device.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
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