CN212658817U - Voltage transformer load box - Google Patents
Voltage transformer load box Download PDFInfo
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- CN212658817U CN212658817U CN202020668376.0U CN202020668376U CN212658817U CN 212658817 U CN212658817 U CN 212658817U CN 202020668376 U CN202020668376 U CN 202020668376U CN 212658817 U CN212658817 U CN 212658817U
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Abstract
The utility model discloses a voltage transformer load box is connected with the mutual-inductor check gauge, voltage transformer load box includes signal processing module, CPLD module, load switching module and load output unit, the mutual-inductor check gauge sends digital signal extremely after receiving the load value of host computer input signal processing module, by after signal processing module handles, output analog signal extremely the CPLD module, the CPLD module basis analog signal output load switching signal extremely load switching module, by load switching module control the load that load output module output and the load value of input correspond. The utility model discloses can adjust the load of output as required, need not the wiring of artifical regulation load box and voltage transformer secondary winding, can also avoid makeing mistakes when simple and convenient.
Description
Technical Field
The utility model relates to a voltage transformer calibration technical field, in particular to voltage transformer load box.
Background
The load box provides various effective loads in the detection process of the current and voltage transformers, and is necessary equipment in the verification process of the transformers. When the double-winding voltage transformer is detected, because the specified load of each measuring winding is inconsistent with the specified load of the protection winding, the wiring of the load box and the secondary winding of the voltage transformer needs to be adjusted manually, the process is troublesome, and errors are easy to occur.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art's weak point, an object of the utility model is to provide a voltage transformer load box can adjust the load of output as required, need not artifical regulation load box and voltage transformer secondary winding's wiring, can also avoid makeing mistakes when simple and convenient.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a voltage transformer load box is connected with a transformer calibrator, and comprises a signal processing module, a CPLD module, a load switching module and a load output unit, wherein the transformer calibrator sends a digital signal to the signal processing module after receiving a load value input by an upper computer, the signal processing module outputs an analog signal to the CPLD module after processing, the CPLD module outputs a load switching signal to the load switching module according to the analog signal, and the load switching module controls the load output module to output a load corresponding to the input load value.
Preferably, in the voltage transformer load box, the signal processing module includes a signal processing chip, a GPIO32 end and a GPIO33 end of the signal processing chip are connected to the transformer calibrator through an RS232 control line, and a GPIO28 end and a GPIO29 end of the signal processing chip are connected to the CPLD module.
Preferably, in the voltage transformer load box, the CPLD module includes a CPLD chip, ends 83 and 84 of the CPLD chip are respectively connected to an end of GPIO28 and an end of GPIO29 of the signal processing chip, and the CPLD chip is connected to the load switching module through a plurality of extended I/O ports.
Preferably, in the voltage transformer load box, the load switching module includes a first relay and a plurality of groups of switching units connected in parallel, each group of switching units includes a second relay and a third relay, a first control end, a second control end and a third control end of the first relay, a control end of the second relay and a control end of the third relay are respectively connected with an extended I/O port of the CPLD chip, a 1 st end of the first relay is used for connecting a 2 nd end or a 3 rd end of the first relay, a 2 nd end of the first relay is connected with a 4 th end of the first relay, a 3 rd end of the first relay is connected with a 5 th end of the first relay, a 1 st end of the second relay is connected with a 4 th end of the first relay, a 1 st end of the third-level electrical appliance is connected with a 5 th end of the first relay, and the 2 nd end of the second relay and the 2 nd end of the third relay are both connected with the load output module.
Preferably, in the voltage transformer load box, the load output module includes a plurality of output units connected to the switching unit one by one, each output unit includes a first resistor, a second resistor, a first inductor and a second inductor, one end of the first resistor is connected to the 2 nd end of the second relay, the other end of the first resistor is connected to one end of the first inductor, one end of the second inductor is connected to the 2 nd end of the third relay and the other end of the first inductor, the other end of the second inductor is connected to one end of the second resistor, and the other end of the second resistor is used for outputting a load.
Preferably, the voltage transformer load box further comprises a display, and the display is connected with the GPIO30 terminal and the GPIO31 terminal of the signal processing chip.
Preferably, in the voltage transformer load box, the model of the signal processing chip is TMS320F 28335.
Preferably, in the voltage transformer load box, the model of the CPLD chip is EPM 7128.
Compared with the prior art, the utility model provides a voltage transformer load box makes through utilizing the CPLD module signaling the load switching module switches the action, makes load output module can export the load that wants according to the demand, need not the wiring of manual regulation load box and voltage transformer secondary winding, can also avoid making mistakes in simple and convenient the time, has practiced thrift cost and space moreover.
Drawings
Fig. 1 is a block diagram of a preferred embodiment of a voltage transformer load box according to the present invention;
fig. 2 is a schematic diagram of a preferred embodiment of the signal processing module in the voltage transformer load box provided by the present invention;
fig. 3 is a schematic diagram of a preferred embodiment of the load switching module and the load output module in the voltage transformer load box provided by the present invention.
Detailed Description
The utility model provides a voltage transformer load box, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the embodiment is lifted to follow with reference to the attached drawing the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.
Referring to fig. 1, an embodiment of the present invention provides a voltage transformer load box, which is connected to a transformer calibrator 1, the voltage transformer load box includes a signal processing module 2, a CPLD module 3, a load switching module 4, and a load output module 5, and the transformer calibrator 1 includes the signal processing module 2, the CPLD module 3, the load switching module 4, and the load output module 5, which are connected in sequence.
Specifically, the transformer calibrator 1 sends a digital signal to the signal processing module 2 after receiving a load value input by the upper computer 6, the signal processing module 2 outputs an analog signal to the CPLD module 3 after processing, the CPLD module 3 outputs a load switching signal to the load switching module 4 according to the analog signal, and the load switching module 4 controls the load output module 5 to output a load corresponding to the input load value.
In other words, the load box inputs a load value through the upper computer 6, and the upper computer can be a computer and a necklace of the mutual inductor tester through an RS232 control line. A plurality of load values can be set on the upper computer 6; the mutual inductor calibrator 1 is connected with a load box through an RS232 control line, the mutual inductor calibrator 1 receives a load value from an upper computer, transmits a digital signal to a signal processing module 2 in the load box through a serial port RS232, the signal processing module 2 is used for processing an input digital signal to obtain an analog signal and outputting the analog signal to a CPLD module 3, the CPLD module 3 receives the analog signal and sends a load switching signal to the load switching module 4 to enable the load switching module 4 to operate so as to realize the load corresponding to the load value output and input by the load output module 5, and the load output module 5 can output different loads, the utility model utilizes the CPLD module 3 to send the load switching signal to enable the load switching module 4 to perform switching operation, so that the load output module 5 can output a desired load according to requirements, the wiring of the load box and the secondary winding of the voltage transformer is not required to be manually adjusted, the fault can be avoided while the operation is simple and convenient, and the cost and the space are saved.
Further, referring to fig. 2, the signal processing module 2 includes a signal processing chip U1, the GPIO32 and the GPIO33 of the signal processing chip U1 are connected to the transformer checker 1 through RS232 control lines, the GPIO28 and the GPIO29 of the signal processing chip U1 are connected to the CPLD module 3, after a digital signal is input to the GPIO32 and the GPIO33 of the signal processing chip U1, the signal processing chip U1 can process the received digital signal and then output an analog signal to the CPLD module 3 through the GPIO28 and the GPIO29, the CPLD module 3 can output a load switching signal according to the analog signal, so as to implement the switching operation of the load switching module 4, in a specific implementation, the signal processing chip U1 employs a DSP chip with a model of TMS320F28335, so as to implement the fast digital signal processing, which has many processes in the prior art, it is not described in detail here, and of course, in other embodiments, the signal processing chip U1 may also be other types of chips, which the present invention is not limited to.
Further, the CPLD module 3 includes a CPLD chip, ends 83 and 84 of the CPLD chip are respectively connected to a GPIO28 end and a GPIO29 end of the signal processing chip U1, the CPLD chip is connected to the load switching module 4 through a plurality of extended I/O ports, after ends 83 and 84 of the CPLD chip receive an analog signal, the CPLD chip can process the received analog signal and further output a load switching signal to the load switching module 4, so that the load switching module 4 is activated, and further the load output module 5 outputs a load corresponding to an input load value, in a specific implementation, the CPLD chip is a CPLD chip of the type EPM7128, has a fast response speed, and can correspondingly output a pulse signal to a module connected to the extended I/O port thereof according to the input signal, so that the load switching module 4 performs a corresponding operation, of course, in other embodiments, the CPLD chip may also adopt other types of chips, which is not limited by the present invention.
Further, referring to fig. 3, the load switching module 4 includes a first relay K1 and a plurality of groups of switching units connected in parallel, each group of the switching units includes a second relay K2 and a third relay K3, a first control end, a second control end and a third control end of the first relay K1, a control end of the second relay K2 and a control end of the third relay K3 are respectively connected to an extended I/O port of the CPLD chip, a 1 st end of the first relay K1 is used to connect a 2 nd end or a 3 rd end of the first relay K1, a 2 nd end of the first relay K1 is connected to a 4 th end of the first relay K1, a 3 rd end of the first relay K1 is connected to a 5 th end of the first relay K1, a 1 st end of the second relay K2 is connected to a 4 th end of the first relay K1, and a 1 st end of the third-stage electrical appliance K3 is connected to the first relay K365 th end of the third relay K1, the 2 nd end of the second relay K2 and the 2 nd end of the third relay K3 are both connected with the load output module 5.
Specifically, the utility model discloses after the CPLD chip output load switching signal, load switching module 4 moves immediately, when the 1 st end of first relay K1 is connected 2 nd end, the rated voltage of load box is 100V, when the 1 st end of first relay K1 is connected 3 rd end, the rated voltage of load box is 100/√ 3V, each switching unit moves according to the load switching signal (pulse signal) that CPLD chip U1 exported at this moment, when the rated voltage is 100V, the 2 nd end of first relay is connected 4 th end, the second relay K2 of each switching unit closes according to the demand, can make the load output module 5 of follow-up connection export different load values; when the rated voltage is 100/√ 3V, the 3 rd end of the first relay K1 is connected with the 5 th end, and the third-stage electrical appliance K3 of each switching unit is closed according to requirements, so that the subsequently connected load output module 5 can output different load values; wherein the number of the switching units is 6 groups.
Further, please refer to fig. 3 continuously, the load output module 5 includes a plurality of output units connected to the switching units one by one, each of the output units includes a first resistor R1, a second resistor R2, a first inductor L1, and a second inductor L2, one end of the first resistor R1 is connected to the 2 nd end of the second relay K2, the other end of the first resistor R1 is connected to one end of the first inductor L1, one end of the second inductor L2 is connected to the 2 nd end of the third relay K3 and the other end of the first inductor L1, the other end of the second inductor L2 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is used for outputting a load.
Specifically, each output unit can output different load values, the load power factor of the load box is 0.8, when COS Φ is 0.8, the effective loads of each output unit are 1.25VA, 2.5VA, 5VA, 10VA, 20VA and 40VA, respectively, and when the rated voltage is 100V, the second relay K2 of each switching unit is closed according to the requirement, so that the load output module 5 can output loads of 1.25VA, 2.5VA, 5VA, 10VA, 20VA and 40VA and any sum; when the rated voltage is 100/√ 3V, the third stage appliances K3 of each switching unit are closed according to requirements, so that the load output module 5 can output loads of 1.25VA, 2.5VA, 5VA, 10VA, 20VA, 40VA and the sum of any sum.
Voltage transformer need provide 2 kinds of load values by some voltage load case in the check-up process and load value fully loaded promptly and lightly, and present load case all is the single channel load case, if adopt the single channel load case to accomplish bifilar voltage transformer's automatic examination, realizes the automatic switch-over load, and the check-up device needs 2 load cases to realize the purpose, and adopts the utility model discloses behind the load case, can effectively reduce load case quantity, reduced the volume of mutual-inductor check-up device greatly for mutual-inductor check-up device is more simplified. And adopt the utility model discloses the load box provides the load for voltage transformer, can realize a wiring, and full automatic measure has simplified operation process. The condition that the test process is troublesome due to the fact that manual wire replacement is needed when a second winding is tested after a winding is tested is avoided by adopting a single load box to check the double-winding voltage transformer.
Preferably, with continuing to refer to fig. 1, the voltage transformer load box further includes a display 7, the display 7 is connected to the GPIO30 terminal and the GPIO31 terminal of the signal processing chip U1, and the display can display the load value to be output by the load box and can be used for manually inputting the load value to the signal processing chip U1.
To sum up, the utility model provides a voltage transformer load box is connected with the mutual-inductor check gauge, voltage transformer load box includes signal processing module, CPLD module, load switching module and load output unit, the mutual-inductor check gauge sends digital signal extremely after receiving the load value of host computer input signal processing module, by after signal processing module handles, output analog signal extremely the CPLD module, the CPLD module basis analog signal output load switching signal extremely load switching module, by load switching module control the load that load output module output and the load value of input correspond. The utility model discloses can adjust the load of output as required, need not the wiring of artifical regulation load box and voltage transformer secondary winding, can also avoid makeing mistakes when simple and convenient.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (8)
1. A voltage transformer load box is connected with a transformer calibrator and is characterized in that the voltage transformer load box comprises a signal processing module, a CPLD module, a load switching module and a load output module, the transformer calibrator sends a digital signal to the signal processing module after receiving a load value input by an upper computer, the signal processing module outputs an analog signal to the CPLD module after processing, the CPLD module outputs a load switching signal to the load switching module according to the analog signal, and the load switching module controls the load output module to output a load corresponding to the input load value.
2. The voltage transformer load box of claim 1, wherein the signal processing module comprises a signal processing chip, a GPIO32 terminal and a GPIO33 terminal of the signal processing chip are connected with the transformer checker through RS232 control lines, and a GPIO28 terminal and a GPIO29 terminal of the signal processing chip are connected with the CPLD module.
3. The voltage transformer load box according to claim 2, wherein the CPLD module comprises a CPLD chip, ends 83 and 84 of the CPLD chip are respectively connected with a GPIO28 end and a GPIO29 end of the signal processing chip, and the CPLD chip is connected with the load switching module through a plurality of expansion I/O ports.
4. The voltage transformer load box according to claim 3, wherein the load switching module comprises a first relay and a plurality of groups of switching units connected in parallel, each group of switching units comprises a second relay and a third relay, a first control end, a second control end and a third control end of the first relay, and a control end of the second relay and a control end of the third relay are respectively connected with an extended I/O port of the CPLD chip, a 1 st end of the first relay is used for connecting a 2 nd end or a 3 rd end of the first relay, a 2 nd end of the first relay is connected with a 4 th end of the first relay, a 3 rd end of the first relay is connected with a 5 th end of the first relay, a 1 st end of the second relay is connected with a 4 th end of the first relay, and a 1 st end of the third relay is connected with a 5 th end of the first relay, and the 2 nd end of the second relay and the 2 nd end of the third relay are both connected with the load output module.
5. The voltage transformer load box according to claim 4, wherein the load output module comprises a plurality of output units connected with the switching units one by one, each output unit comprises a first resistor, a second resistor, a first inductor and a second inductor, one end of the first resistor is connected with the 2 nd end of the second relay, the other end of the first resistor is connected with one end of the first inductor, one end of the second inductor is connected with the 2 nd end of the third relay and the other end of the first inductor, the other end of the second inductor is connected with one end of the second resistor, and the other end of the second resistor is used for outputting a load.
6. The voltage transformer load box of claim 2, further comprising a display, wherein the display is connected with the GPIO30 terminal and the GPIO31 terminal of the signal processing chip.
7. The voltage transformer load box of claim 2, wherein the signal processing chip is model TMS320F 28335.
8. The voltage transformer load box according to claim 3, wherein the CPLD chip is EPM 7128.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020668376.0U CN212658817U (en) | 2020-04-27 | 2020-04-27 | Voltage transformer load box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020668376.0U CN212658817U (en) | 2020-04-27 | 2020-04-27 | Voltage transformer load box |
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| Publication Number | Publication Date |
|---|---|
| CN212658817U true CN212658817U (en) | 2021-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020668376.0U Active CN212658817U (en) | 2020-04-27 | 2020-04-27 | Voltage transformer load box |
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|---|---|
| CN (1) | CN212658817U (en) |
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- 2020-04-27 CN CN202020668376.0U patent/CN212658817U/en active Active
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