CN112834839A - Portable device and system for transformer field comprehensive test - Google Patents
Portable device and system for transformer field comprehensive test Download PDFInfo
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- CN112834839A CN112834839A CN202011578548.6A CN202011578548A CN112834839A CN 112834839 A CN112834839 A CN 112834839A CN 202011578548 A CN202011578548 A CN 202011578548A CN 112834839 A CN112834839 A CN 112834839A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application relates to a portable device and a system for transformer field comprehensive test. The device comprises: the device comprises a variable frequency power supply, a selection switch and at least two test modules; the variable frequency power supply is used for controlling the selection switch to conduct a path among the variable frequency power supply, the target test module and the transformer to be tested according to a control instruction so as to test the transformer to be tested; the control instruction comprises the identification of the target test module. By adopting the method, a mobile monitoring vehicle which is expensive and inconvenient to carry is not needed, a worker is not needed to carry a special testing device for various tests and a plurality of wiring for corresponding tests, the testing efficiency and the field test safety coefficient are improved, meanwhile, the integration level is high, technologies such as a high-frequency switching power supply are utilized to replace a bulky induction voltage regulator, and the size, the weight and the cost of the testing device are reduced.
Description
Technical Field
The application relates to the technical field of distribution transformers, in particular to a portable device and a system for field comprehensive tests of transformers.
Background
With rapid development of national economy and pace acceleration of power grid construction, continuous expansion of power grid scale and increasing of short-circuit capacity, higher requirements are provided for safe and reliable operation of a distribution transformer, and therefore relevant test detection needs to be carried out on the distribution transformer to detect the safety and reliability of the distribution transformer.
In the prior art, when the distribution transformer is used for safety and reliability inspection, a mobile test detection vehicle is generally used for carrying out multiple functional tests on the distribution transformer. Wherein, including possessing a plurality of special detection device of multiple functional test in the mobile test detection car, when needs examine each function, need the staff to drive heavy mobile test car near experimental scene and test, and to residential area basement distribution room or commercial high-rise building distribution room because the space is narrow and small and restraint the ineligible. Meanwhile, the mobile test detection vehicle for detecting the safety and reliability of the distribution transformer at present has the problems of large volume, high price, low integration level, low test efficiency and the like.
Disclosure of Invention
In view of the above, it is desirable to provide a portable device and a system for transformer field comprehensive test, which are portable, highly integrated and highly efficient in testing.
In a first aspect, the present application provides a portable device for a field comprehensive test of a transformer, the device comprising: the device comprises a variable frequency power supply, a selection switch and at least two test modules; the selection switch is respectively connected with the variable frequency power supply and each test module, and each test module is connected with the transformer to be tested;
the variable frequency power supply is used for controlling the selection switch to conduct a path among the variable frequency power supply, the target test module and the transformer to be tested according to the control instruction so as to test the transformer to be tested; the control instruction comprises the identification of the target test module.
In one embodiment, the at least two testing modules include at least two of a resistance testing module, a boost transformation module, a capacitance compensation module, and a filtering module.
In one embodiment, the resistance testing module comprises a rectifying unit and a first switching unit, wherein the rectifying unit is respectively connected with the variable frequency power supply and the first switching unit, and the first switching unit is connected with the transformer to be tested;
the rectifying unit is used for rectifying alternating current output by the variable frequency power supply into direct current;
the first switch unit is used for selecting an output phase line of the direct current.
In one embodiment, the step-up and transformation module comprises a step-up transformer and a second switch unit, the step-up transformer is respectively connected with the variable frequency power supply and the second switch unit, and the second switch unit is connected with the transformer to be tested;
the step-up transformer is used for performing step-up operation on the voltage output by the variable frequency power supply to obtain a boosted voltage;
the variable frequency power supply is also used for controlling the second switch to be disconnected with the transformer to be tested when the output current of the transformer to be tested is larger than a preset threshold value.
In one embodiment, the variable frequency power supply comprises a controller, a sensor and a human-computer interaction device, wherein the sensor is respectively connected with the controller and the transformer to be tested, and the human-computer interaction device is connected with the controller;
the sensor is used for acquiring the parameters of the transformer to be detected;
the controller is used for testing and analyzing the transformer to be tested according to the parameters of the transformer to be tested;
and the human-computer interaction device is used for acquiring the control instruction.
In one embodiment, the variable frequency power supply further comprises a communication device connected to the controller.
In one embodiment, the sensor comprises at least one of a current-voltage sensor, a temperature sensor, and an internal resistance sensor.
In one embodiment, the variable frequency power supply further comprises an amplifier, and the amplifier is respectively connected with the controller and the sensor.
In one embodiment, the selection switch comprises at least two single-pole single-throw switches or alternating-current contactors, and each single-pole single-throw switch or alternating-current contactor is connected with the variable-frequency power supply and the corresponding test module; alternatively, the first and second electrodes may be,
the selection switch is a single-pole multi-throw switch.
In a second aspect, the present application provides a portable system for field integrated testing of transformers, the system comprising a transformer to be tested and a portable apparatus for field integrated testing of transformers as described above in the first aspect.
The portable device of the on-spot combined test of transformer that this application embodiment provided, the portable device of the on-spot combined test of transformer includes: the testing device comprises a variable frequency power supply, a selection switch and at least two testing modules, wherein the selection switch is respectively connected with the variable frequency power supply and each testing module, each testing module is connected with a transformer to be tested, and the variable frequency power supply controls the selection switch to conduct a path among the variable frequency power supply, a target testing module and the transformer to be tested according to a control instruction so as to test the transformer to be tested. Can switch on the route between variable frequency power supply and target test module and the transformer that awaits measuring through control command, carry out corresponding test to the transformer that awaits measuring, need not the special testing arrangement of staff's multiple test and carry out the experiment that corresponds, improve efficiency of software testing, and the integrated level is high, utilizes high frequency power supply to replace bulky induction voltage regulating transformer or linear power supply simultaneously, has reduced testing arrangement's volume, weight and cost greatly.
Drawings
FIG. 1 is a block diagram of a portable apparatus for field integrated testing of transformers according to an embodiment;
FIG. 2 is a block diagram of a portable apparatus for field integrated testing of transformers in another embodiment;
FIG. 3 is a block diagram of a portable apparatus for field integrated testing of transformers in another embodiment;
FIG. 4 is a block diagram of a portable apparatus for field integrated testing of transformers in another embodiment;
FIG. 5 is a block diagram of a portable apparatus for field integrated testing of transformers according to another embodiment;
FIG. 6 is a block diagram of a portable apparatus for field integrated testing of transformers in another embodiment;
FIG. 7 is a block diagram of a portable apparatus for field integrated testing of transformers in another embodiment;
FIG. 8 is a block diagram of a portable apparatus for field integrated testing of transformers in another embodiment;
FIG. 9 is a block diagram of a portable apparatus for field integrated testing of transformers according to another embodiment;
FIG. 10 is a block diagram of a transformer test system in accordance with one 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 numbering of the components as such, for example "first", "second", etc., in this application is used solely to distinguish between the objects depicted and not to imply any order or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The distribution transformer is a foundation stone for supporting a power grid to convert voltage and current, is a hardware carrier related to safe operation of the power grid, and the reliability of the distribution transformer not only affects the life of residents and industrial production, but also is directly related to the guarantee capability of special industries and even specific national fields. The quality control is an important link of the whole life cycle management of the power grid materials, and the performance verification running through the life cycle of the transformer is a basic technology of potential risk mining timeliness and is an important support for the operation and maintenance decision of the transformer. Therefore, the distribution transformer needs to use a mobile test vehicle to perform multiple tests such as an insulation resistance test, a no-load test, a winding resistance test, a partial discharge test, a power frequency withstand voltage test, an induction withstand voltage test and the like on an application site, so as to obtain related quality control test conclusions. However, the induction voltage regulator in the existing mobile test vehicle has a large volume, and when different tests are carried out, the related test devices need to be manually wired and debugged, so that the problems of potential safety hazards and low efficiency exist, and the problems are solved. Meanwhile, the test of the safety performance such as the field temperature rise detection of the distribution transformer needs to be completed in fixed places such as a third-party laboratory and a transformer manufacturer laboratory, the field test cannot be realized, and the field test is inconvenient to carry out mainly because the test power supply capacity and the test device are overlarge in size. In order to enhance the quality control force of the transformer, improve a power grid material control technical system and solve the problems that the current field test personnel has large danger coefficient and low efficiency in the process of carrying out field test work of the transformer, and a test device cannot be carried to the field, the portable transformer field comprehensive test device integrates tests such as a temperature rise test, a no-load test, a winding resistance test, a partial discharge test, a power frequency withstand voltage test, an induction withstand voltage test and the like. Based on this, the following embodiments of the present application provide a portable device and system for field integrated test of transformers, which can solve the above technical problems. The following specifically describes examples of the present application.
Fig. 1 is a block diagram of a portable apparatus for field integrated test of a transformer according to an embodiment of the present disclosure. As shown in fig. 1, the portable device for the field comprehensive test of the transformer comprises: the device comprises a variable frequency power supply 11, a selection switch 12 and at least two test modules 13; the selection switch 12 is respectively connected with the variable frequency power supply 11 and each test module 13, and each test module 13 is connected with the transformer 14 to be tested;
the variable frequency power supply 11 is used for controlling the selector switch 12 to conduct a path among the variable frequency power supply 11, the target test module 13 and the transformer 14 to be tested according to the control instruction so as to test the transformer 14 to be tested; the control instruction comprises the identification of the target test module.
In the embodiment of the application, an input end of a variable frequency power supply is connected with a mains supply provided by a power grid, wherein the mains supply can be a 380V alternating current signal, the variable frequency power supply outputs a sine wave signal to a selective switch module through AC → DC → AC conversion of the received 380V alternating current of the mains supply, and the output frequency and the output voltage are adjustable within a certain range.
The input end of the selection switch is connected with the output end of the variable frequency power supply, the output end of the selection switch is connected with each test module, the selection switch can be composed of a plurality of single-pole single-throw switches or alternating current contactors, each single-pole single-throw switch or alternating current contactor is connected with the output end of the variable frequency power supply, and each single-pole single-throw switch or alternating current contactor is respectively connected with one test module; the selection switch may also be composed of one or more single-pole multi-throw switches or ac contactors, wherein an input end of the single-pole multi-throw switch or the ac contactor is connected to an output end of the variable frequency power supply, and output ends of the single-pole multi-throw switch or the ac contactor correspond to the plurality of test modules, which is not limited herein.
The input ends of the at least two test modules are connected with the selector switch, each test module receives different input electric signals required by different tests, the output ends of the at least two test modules are connected with the transformer to be tested, and each test module adjusts the received input electric signals into test electric signals and transmits the test electric signals to the transformer to be tested. Wherein, the test module can include: the device comprises a resistance testing module, a boosting and transforming module, a capacitance compensation module and a filtering module. At least two test modules can be for containing two test modules of resistance test module and step up vary voltage module, perhaps contain two test modules of resistance test module and capacitance compensation module, perhaps two test modules of step up vary voltage module and filtering module, also can contain resistance test module, two test modules of step up vary voltage module and capacitance compensation module, also can contain step up vary voltage module, three test module of capacitance compensation module and filtering module, can also contain resistance test module, step up vary voltage module, four test modules of capacitance compensation module and filtering module, do not put the restriction here.
The transformer to be tested refers to a distribution transformer that needs to perform a relevant test, wherein the transformer to be tested may be a dry type transformer or a liquid immersed type transformer, and is not limited herein.
The control instruction is that when a user needs to perform different test tests on the transformer to be tested, the user instructs the variable frequency power supply which switch of the selection switches is closed, so that a path between the variable frequency power supply and the corresponding test module is switched on, and the transformer to be tested is subjected to the corresponding test. For example, when a winding resistance test needs to be performed on a transformer to be tested, the variable frequency power supply receives a control instruction for closing a selection switch between the variable frequency power supply and the resistance test module, the selection switch between the variable frequency power supply and the resistance test module is closed according to the control instruction, a channel between the variable frequency power supply and the resistance test module is conducted, and meanwhile, the variable frequency power supply converts a received 380V voltage signal into a direct current signal for testing the winding resistance through the resistance test module, so that a test voltage is provided for testing the transformer to be tested. The control instruction includes an identifier of the target test module, where the identifier may be a name, a label, and the like of the target test module, and is not limited herein.
In this embodiment, the portable device for the field comprehensive test of the transformer comprises: the frequency conversion power supply, the selection switch and at least two test modules, wherein the selection switch is respectively connected with the frequency conversion power supply and each test module, each test module is connected with the transformer to be tested, and the frequency conversion power supply controls the selection switch to conduct a path among the frequency conversion power supply, the target test module and the transformer to be tested according to a control instruction so as to test the transformer to be tested. The portable device of the on-site comprehensive test of the transformer can switch on a path between the variable frequency power supply and the target test module and between the variable frequency power supply and the transformer to be tested through a control instruction, corresponding tests are carried out on the transformer to be tested, a worker is not required to carry a special test device for various tests to carry out corresponding tests, the test efficiency is improved, the safety coefficient and the integration level are high, meanwhile, the high-frequency power supply is used for replacing a large-size voltage regulating transformer, and the size and the price of the test device are reduced.
The above-described embodiment illustrates a portable apparatus for field integrated test of a transformer, in which at least two test modules provide a possibility for performing various function tests in the portable apparatus for field integrated test of a transformer, and on the basis of the above-described embodiment, at least two test modules in the portable apparatus for field integrated test of a transformer are illustrated, and in one embodiment, as shown in fig. 2, the at least two test modules include at least two of a resistance test module 131, a step-up transformer module 132, a capacitance compensation module 133, and a filter module 134.
In this embodiment of the application, the at least two test modules include at least two of a resistance test module, a step-up transformer module, a capacitance compensation module and a filter module, and may be two test modules including a resistance test module and a step-up transformer module, or two test modules including a resistance test module and a capacitance compensation module, or two test modules including a step-up transformer module and a filter module, or may be three test modules including a resistance test module, a step-up transformer module and a capacitance compensation module, or may be three test modules including a step-up transformer module, a capacitance compensation module and a filter module, or may be four test modules including a resistance test module, a step-up transformer module, a capacitance compensation module and a filter module, which are not limited herein.
The resistance testing module can be used for carrying out winding resistance testing tests; the voltage boosting and transforming module can be used for performing power frequency withstand voltage test and induction withstand voltage test; the capacitance compensation module can be used for carrying out no-load test, load test and temperature rise test; the filtering module can be used for performing a partial discharge test.
In this embodiment, the at least two testing modules include at least two of the resistance testing module, the voltage boosting and transforming module, the capacitance compensation module and the filtering module, so that the testing modules with different testing functions can be integrated into the portable device for the field comprehensive test of the transformer.
The above embodiment describes each component of a portable device for a transformer field comprehensive test, where the portable device for the transformer field comprehensive test includes at least two test modules, and the test modules are further described, as shown in fig. 3, a resistance test module includes a rectifying unit 31 and a first switch unit 32, the rectifying unit 31 is connected to a variable frequency power supply 11 and the first switch unit 32, and the first switch unit 32 is connected to a transformer to be tested 14; the rectifying unit is used for rectifying alternating current output by the variable frequency power supply into direct current; the first switch unit is used for selecting an output phase line of the direct current.
In the present example, the resistance testing module is a testing module for testing winding resistance of the transformer to be tested. When the winding test is performed on the transformer to be tested, a direct current signal must be used as a test voltage, the rectifier module rectifies an alternating current signal output by the variable frequency power supply and converts the alternating current signal into a direct current signal, and the rectifier module can adopt a half-wave rectifier circuit, a full-wave rectifier circuit, a bridge rectifier circuit and the like without limitation.
Wherein, first switch element can be two single-pole double-throw switches or two ac contactor, when rectifier module rectifies the alternating current signal of variable frequency power supply output and output direct current signal, need to input the direct current signal who produces into the two-phase line of the transformer that awaits measuring, consequently need select the three-phase line of the input of the transformer that awaits measuring, greatly improve test efficiency, can select two phase lines in the transformer that awaits measuring to connect according to the relevant instruction that variable frequency power supply received, can select as in fig. 3, A, B phase lines connect, also can select A, C phase lines to connect, also can select B, C phase lines to connect, do not restrict here.
In this embodiment, the resistance testing module includes a rectifying unit and a first switch unit, the rectifying unit is respectively connected to the variable frequency power supply and the first switch unit, the first switch unit is connected to the transformer to be tested, the rectifying unit receives the ac signal provided by the variable frequency power supply, rectifies the ac signal output by the variable frequency power supply into a dc signal and transmits the dc signal to the transformer to be tested, the first switch unit selects two phase lines of three phase lines at the input end of the transformer to be tested to connect, the testing circuit is turned on, because the input ac signal is converted into a dc signal by the rectifying circuit in the rectifying unit, so as to provide a constant dc power to the transformer to be tested, the winding resistance can be calculated by measuring the applied voltage and the applied current, and meanwhile, the ac signal provided by the variable frequency power supply needs to select two phase lines of the transformer to be tested to connect after being rectified into a, and the variable frequency power supply closes a switch in the first switch unit according to an instruction of closing any two phase lines of the three phase lines at the input end of the transformer to be tested, and conducts the test loop to perform winding test. Therefore, when the winding resistance test is carried out, the variable frequency power supply can provide the constant current source required by the transformer to be tested through the resistance test module, a tester does not need to adopt the fixed test device for carrying out the winding test to be connected with the transformer to be tested in a wiring manner, and the test efficiency is improved.
On the basis of the above embodiments, further description is made on the test module in the portable device for the field comprehensive test of the transformer, in one embodiment, as shown in fig. 4, the step-up transformer module includes a step-up transformer 41 and a second switch unit 42, the step-up transformer 41 is connected to the variable frequency power supply 11 and the second switch unit 42, and the second switch unit 42 is connected to the transformer to be tested 14; the step-up transformer 41 is used for performing step-up operation on the voltage output by the variable frequency power supply 11 to obtain a boosted voltage; the variable frequency power supply 11 is further configured to control the second switch unit 42 to disconnect the transformer 14 to be tested when the output current of the transformer 14 to be tested is greater than the preset threshold.
In the embodiment of the application, the step-up and transformation module comprises a step-up transformer and a second switch unit, the step-up and transformation module is respectively connected with the variable frequency power supply and the second switch unit, and the second switch unit is connected with the transformer to be tested; the step-up transformer may be a high-frequency step-up transformer, an alternating-current step-up transformer, a dry step-up transformer, or a low-frequency step-up transformer, which is not limited herein. The step-up transformer is used for boosting the voltage output by the variable-frequency power supply. When a power frequency voltage test is carried out, a variable frequency power supply provides a 600V voltage signal for a voltage transformer to be tested, and a step-up transformer can increase the 600V voltage signal to an alternating current signal with the frequency of 50Hz and the voltage value of (3-35) kV required by the test; in the induction withstand voltage test, the step-up transformer boosts the (0-600) V voltage signal provided by the variable frequency power supply to an AC signal with a frequency of 200Hz and a voltage value of (800-2000) V, which is required by the test, without limitation.
The second switch unit can be three single-pole single-throw switches or three alternating-current contactors, the input end of each single-pole single-throw switch or each alternating-current contactor is connected with the output end of the three-phase line of the step-up transformer, and the output end of each single-pole single-throw switch or each alternating-current contactor is connected with the input end of the three-phase line of the transformer to be tested. When a power frequency test or an induction test is carried out, the variable frequency power supply collects that the output current of the transformer to be tested is greater than a preset threshold value, and the closed single-pole single-throw switch or the alternating current contactor in the second switch unit is switched off. For example, when the variable frequency power supply acquires that the leakage current of the transformer to be tested is greater than a preset threshold (generally 100mA), which means that the transformer to be tested may have a local defect or a fault, the variable frequency power supply controls the switches in the second switch unit to be completely turned off.
In this embodiment, the step-up transformer module includes a step-up transformer and a second switch unit, the step-up transformer module is connected to the variable frequency power supply and the second switch unit, the second switch unit is connected to the transformer to be tested, the step-up transformer performs step-up operation on the voltage output by the variable frequency power supply to obtain a stepped-up voltage, when the output current of the transformer to be tested is greater than a preset threshold, the second switch is controlled to be disconnected with the transformer to be tested, so that the output voltage of the variable frequency power supply can reach the voltage required by the test through the voltage boosting and transforming module, and the corresponding test is carried out, meanwhile, the second switch unit can protect the portable device for the on-site comprehensive test of the transformer, so that when the transformer to be tested is short-circuited, the portable device for the field comprehensive test of the transformer is burnt out, and the safety of the portable device for the field comprehensive test of the transformer is improved.
The above embodiment describes a portable device for a transformer field comprehensive test, wherein a variable frequency power supply not only can provide a power supply signal for testing a transformer to be tested, but also has a function of interacting with the outside, and also has a function of controlling other constituent modules of the portable device for the transformer field comprehensive test, and is a core part of the portable device for the whole transformer field comprehensive test, and now the variable frequency power supply is further described by using an embodiment, as shown in fig. 5, the variable frequency power supply includes a controller 51, a sensor 52, and a human-computer interaction device 53, the sensor 52 is respectively connected with the controller 51 and the transformer 14 to be tested, and the human-computer interaction device 53 is connected with the controller 51; the sensor 52 is used for acquiring the parameters of the transformer to be detected; the controller 51 is used for testing and analyzing the transformer to be tested according to the parameters of the transformer to be tested; and the human-computer interaction device 53 is used for acquiring the control instruction.
In this embodiment of the present application, the variable frequency power supply includes a controller, a sensor, and a human-computer interaction device, where the controller may be implemented by a Micro Control Unit (MCU) chip, a dsp (digital Signal processing) chip, a Field Programmable Gate Array (FPGA) chip, and the like, and is not limited in this embodiment of the present application. The controller can analyze and calculate the operation parameters of the transformer to be tested, which are acquired by the sensor, for example, when the transformer to be tested is subjected to a temperature rise test, the secondary side voltage, current and power information of the transformer to be tested and the temperature change condition are acquired by the sensor, whether the related data meet the national standard of the transformer temperature rise test is analyzed, and a test conclusion is obtained.
The sensor may be a voltage sensor, a current sensor, a temperature sensor, an internal resistance sensor, and the like, which is not limited herein. The voltage sensor and the current sensor can acquire input and output currents of the transformer to be tested in the test process and transmit the input and output currents to the controller in real time, the temperature sensor can acquire a temperature value of the transformer to be tested in the test process and transmit the temperature value to the controller in real time, and the internal resistance sensor can acquire an internal resistance value of the transformer to be tested and transmit the internal resistance value to the controller in real time.
The human-computer interaction device is used for obtaining a control instruction, for example, when a tester needs to test winding resistance of a transformer to be tested, the human-computer interaction device sends a conduction instruction of the control resistance testing module, receives the conduction instruction of the control resistance testing module and transmits the control instruction to the controller, and the controller controls a selector switch between the variable frequency power supply and the resistance testing module to be closed so as to conduct a testing circuit.
In this embodiment, the variable frequency power supply includes a controller, a sensor, and a human-computer interaction device, the sensor is respectively connected to the controller and the transformer to be tested, the human-computer interaction device is connected to the controller, the sensor collects parameters of the transformer to be tested, and the controller performs test analysis on the transformer to be tested according to the parameters of the transformer to be tested. Because the variable frequency power supply can receive the control instruction through the human-computer interaction device, the access between the variable frequency power supply and different test modules is automatically switched on, the transformer to be tested is tested, data parameters of the transformer to be tested in the test process are collected, analysis and calculation are carried out, the test result is given, manual carrying of the test device is not needed, and wiring test with the transformer to be tested is not needed, so that the test efficiency and accuracy are improved.
On the basis of the above embodiment, as shown in fig. 6, the variable frequency power supply further includes a communication device 54 connected to the controller 51.
In the embodiment of the application, the communication device is connected with the controller, can perform wired or wireless communication with an external terminal, and can transmit the operation parameters and the operation state of the transformer to be tested, which are acquired by the controller, to the external terminal for display. The wireless mode may be implemented by WIFI, an operator network, NFC (near field communication), or other technologies, which is not limited herein. The external terminal may be any one of various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices, which is not limited herein.
In this embodiment, can realize the communication with external terminal through the inside communication device of variable frequency power supply, the tester of being convenient for monitors the state parameter of the transformer that awaits measuring and testing arrangement in real time, simultaneously, can also be according to the state parameter of the transformer that awaits measuring and testing arrangement, in time closes testing arrangement, avoids the production of trouble.
On the basis of the above-described embodiment, as shown in fig. 7, the sensor 52 includes at least one of a current-voltage sensor 521, a temperature sensor 522, and an internal resistance sensor 523.
In an embodiment of the application, the sensor comprises at least one of a current-voltage sensor, a temperature sensor, and an internal resistance sensor. The sensor includes, for example, a current-voltage sensor and a temperature sensor, or a current-voltage sensor, a temperature sensor and an internal resistance sensor, or a current-voltage sensor and an internal resistance sensor, which are not limited herein.
The current and voltage sensor is used for collecting input voltage and input current of the transformer to be tested and secondary side voltage and current of the transformer to be tested, and transmitting collected voltage signals and current signals to the controller, so that the controller can analyze data and judge whether the transformer to be tested breaks down. The temperature sensor is generally used for acquiring the temperature change of the transformer to be tested when the transformer to be tested is subjected to a temperature rise test, and transmitting the acquired voltage and current signals to the controller. The internal resistance sensor is used for collecting internal impedance signals of the transformer to be tested during testing and transmitting the signals to the controller.
In this embodiment, the sensor includes at least one in the current-voltage sensor, a temperature sensor, the internal resistance sensor, through these heterogeneous sensors, can gather the multiple test signal of the transformer that awaits measuring, for the controller carries out the analysis calculation through these test signals, obtain the test result, the number of times of working a telephone switchboard has been reduced, the accuracy and the security of test result have been improved, simultaneously when carrying out the test of different functions to the transformer that awaits measuring, because the sensor gathers test signal in real time, whether the transformer that awaits measuring can in time be found to the controller among the variable frequency power supply according to test signal is trouble, testing arrangement's security has been improved.
On the basis of the above embodiment, as shown in fig. 8, the variable frequency power supply further includes an amplifier 55, and the amplifier is connected to the controller 51 and the sensor 52, respectively.
In this embodiment, the variable frequency power supply further includes an amplifier, an input terminal of the amplifier is connected to the output terminal of the sensor, and an output terminal of the amplifier is connected to the input terminal of the controller. The amplifier may be a voltage sensitive preamplifier, a charge sensitive preamplifier, a current sensitive preamplifier, a parallel feedback current amplifier, or the like, which is not limited herein. The amplifier can process voltage signals, current signals and the like sent by the sensor, output signals such as voltage, current and the like with stable gain, low noise and good performance, and transmit the signals to the controller.
In this embodiment, the amplifier inside the variable frequency power supply can process the output signal of the transformer to be tested, which is acquired by the sensor, and output a signal with stable gain, low noise and good performance to the controller, and the controller performs fault analysis and calculation by using the test signal amplified by the amplifier due to the stable gain, low noise and good performance of the test signal, thereby improving the accuracy of the test result.
To facilitate understanding of the technical staff, the portable device for the field integrated test of the transformer is now described with an embodiment, as shown in fig. 9, the portable device for the field integrated test of the transformer includes: the device comprises a variable frequency power supply 91, a selection switch 92 and at least two test modules 93; the variable frequency power supply comprises a controller 911, a sensor 912, a man-machine interaction device 913, a communication device 914 and an amplifier 915, wherein the sensor 912 is respectively connected with the controller 911 and the transformer 94 to be tested. Wherein the sensor 912 includes at least one of a current-voltage sensor 9121, a temperature sensor 9122, and an internal resistance sensor 9123; the human-computer interaction device 913 is connected with the controller 911; the amplifier 915 is respectively connected with the controller 911 and the sensor 912; the communication device 914 is connected with the controller 911; the selection switch 92 is respectively connected with the variable frequency power supply 91 and each test module 93, and each test module 93 is connected with the transformer 94 to be tested. Wherein the selection switch 92 comprises four single pole single throw switches or ac contactors. The testing module 93 includes a resistance testing module 931, a step-up transforming module 932, a capacitance compensating module 933, and a filtering module 934. The resistance testing module 931 comprises a rectifying unit 9131 and a first switch unit 9132, wherein the rectifying unit 9131 is connected with the variable frequency power supply 91 and the first switch unit 9132 respectively, and the first switch unit 9132 is connected with the transformer 94 to be tested; the step-up transformer module 932 includes a step-up transformer 9321 and a second switch unit 9322, the step-up transformer 9321 is connected to the variable frequency power supply 91 and the second switch unit 9322, and the second switch unit 9322 is connected to the transformer 94 to be tested. The capacitance compensation module 933 includes a parallel capacitor connected in parallel between the variable frequency power supply 91 and the transformer 94 to be tested, for improving the power compensation factor. The filtering module 934 is a filter composed of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency.
The components, connection relationships, and use processes of the parts in this embodiment may refer to the detailed description in the foregoing embodiments, and are not repeated herein.
In this embodiment, the portable device for the field comprehensive test of the transformer comprises a variable frequency power supply, a selection switch and at least two test modules, wherein the selection switch is respectively connected with the variable frequency power supply and each test module, each test module is connected with the transformer to be tested, and the variable frequency power supply is used for controlling the selection switch to conduct a path among the variable frequency power supply, a target test module and the transformer to be tested according to a control instruction so as to test the transformer to be tested. Can switch on the route between variable frequency power supply and target test module and the transformer that awaits measuring through control command, carry out corresponding test to the transformer that awaits measuring, need not operations such as the special testing arrangement of staff's transport multiple test, wiring many times and carry out corresponding experiment, improve efficiency of software testing, the while integrated level is high, utilizes high frequency power supply to replace bulky regulating transformer, has reduced testing arrangement's volume, weight and cost.
The above embodiment describes a portable device for field integrated test of a transformer, and the embodiment of the present application further provides a portable system for field integrated test of a transformer, as shown in fig. 10, including a transformer 101 to be tested and the portable device 102 for field integrated test of a transformer.
The portable device for the field comprehensive test of the transformer can perform no-load test, winding resistance test, partial discharge test, power frequency withstand voltage test, induction withstand voltage test and temperature rise test on the transformer to be tested. When the winding resistance test is carried out, the portable device for the field comprehensive test of the transformer can convert input alternating current into direct current required by the test, transmit the direct current to the transformer to be tested, test the winding resistance of the transformer to be tested, and judge whether the transformer to be tested breaks down or not by comparing the resistance value of the winding resistance with the unbalance rate of the three-phase resistance. When a power frequency withstand voltage test is carried out, the portable device of the transformer field comprehensive test raises an input alternating current signal to a voltage signal with the frequency of 50Hz and the voltage value of (3-35) kV, the voltage signal is transmitted to the transformer to be tested, the leakage current value of the transformer to be tested is tested, and whether the transformer to be tested breaks down or not is judged by looking at whether a field sample has voltage breakdown and flashover or not and comparing the leakage current value with a preset threshold value. When the induction voltage withstand test is carried out, the portable device for the field comprehensive test of the transformer raises the input alternating current signal to a voltage signal with the frequency of 200Hz and the voltage value of (800-2000) V required by the test, tests the fault current of the transformer to be tested, and judges whether the transformer to be tested breaks down or not by observing whether a field sample has voltage breakdown and flashover or not and comparing the magnitude relation between the fault current value and a preset threshold value. When the temperature rise test is carried out, the portable device for the field comprehensive test of the transformer provides an alternating current signal with a voltage value of 0-600V, and whether the temperature change of the transformer to be tested exceeds a preset temperature change range is tested. When the no-load test is carried out, the portable device of the transformer field comprehensive test provides a rated voltage value of a low-voltage side of a sample, the no-load current and the harmonic content of the transformer to be tested are tested, and whether the transformer to be tested breaks down or not is judged by comparing the magnitude relation between the no-load current and the harmonic content and a preset threshold value. When the partial discharge test is carried out, the portable device of the transformer field comprehensive test provides a rated voltage value of a sample low-voltage side, an output electric signal of the transformer to be tested is tested, whether a point discharge phenomenon occurs or not is observed according to the waveform of the output electric signal, and whether the transformer to be tested fails or not is judged according to the size relation between the test partial discharge value and the national standard specification. .
The components, connection relationships and use processes of the parts in this embodiment can be referred to the detailed description in the embodiment of the portable device for the field comprehensive test of the transformer, and are not described herein again.
In this embodiment, the system includes the transformer to be tested and the portable device for the field comprehensive test of the transformer, and the portable device for the field comprehensive test of the transformer can perform a no-load test, a winding resistance test, a partial discharge test, a power frequency withstand voltage test, an induction withstand voltage test and a temperature rise test on the transformer to be tested. The system can accurately obtain various test results of the transformer to be tested, and simultaneously, a plurality of transformer test tests can be carried out through a portable device of the field comprehensive test of the transformer, so that the integration level is high.
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 portable device for transformer field comprehensive test is characterized in that the device comprises: the device comprises a variable frequency power supply, a selection switch and at least two test modules; the selection switch is respectively connected with the variable frequency power supply and each test module, and each test module is connected with a transformer to be tested;
the variable frequency power supply is used for controlling the selection switch to conduct a path among the variable frequency power supply, the target test module and the transformer to be tested according to a control instruction so as to test the transformer to be tested; the control instruction comprises the identification of the target test module.
2. The apparatus of claim 1, wherein the at least two testing modules comprise at least two of a resistance testing module, a boost transformation module, a capacitance compensation module, and a filtering module.
3. The device of claim 2, wherein the resistance testing module comprises a rectifying unit and a first switching unit, the rectifying unit is respectively connected with the variable frequency power supply and the first switching unit, and the first switching unit is connected with the transformer to be tested;
the rectifying unit is used for rectifying alternating current output by the variable frequency power supply into direct current;
the first switch unit is used for selecting the output phase line of the direct current.
4. The device according to claim 2, wherein the step-up transformer module comprises a step-up transformer and a second switch unit, the step-up transformer is respectively connected with the variable frequency power supply and the second switch unit, and the second switch unit is connected with the transformer to be tested;
the boosting transformer is used for boosting the voltage output by the variable frequency power supply to obtain boosted voltage;
the variable frequency power supply is further used for controlling the second switch to be disconnected with the transformer to be tested when the output current of the transformer to be tested is larger than a preset threshold value.
5. The device according to any one of claims 1 to 4, wherein the variable frequency power supply comprises a controller, a sensor and a human-computer interaction device, the sensor is respectively connected with the controller and the transformer to be tested, and the human-computer interaction device is connected with the controller;
the sensor is used for acquiring parameters of the transformer to be detected;
the controller is used for testing and analyzing the transformer to be tested according to the parameters of the transformer to be tested;
and the human-computer interaction device is used for acquiring the control instruction.
6. The apparatus of claim 5, wherein the variable frequency power supply further comprises a communication device connected to the controller.
7. The apparatus of claim 5, wherein the sensor comprises at least one of a current-voltage sensor, a temperature sensor, and an internal resistance sensor.
8. The apparatus of claim 5, wherein the variable frequency power supply further comprises an amplifier, the amplifier being connected to the controller and the sensor, respectively.
9. The apparatus of claim 1, wherein the selection switch comprises at least two single-pole single-throw switches or ac contactors, each of which is connected to the variable frequency power supply and a corresponding test module; alternatively, the first and second electrodes may be,
the selection switch is a single-pole multi-throw switch.
10. A portable system for field integrated testing of transformers, comprising a transformer to be tested and a portable device for field integrated testing of transformers according to claims 1-9.
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| CN202011578548.6A CN112834839A (en) | 2020-12-28 | 2020-12-28 | Portable device and system for transformer field comprehensive test |
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| CN202011578548.6A CN112834839A (en) | 2020-12-28 | 2020-12-28 | Portable device and system for transformer field comprehensive test |
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