CN215641777U - Current transformer load box - Google Patents
Current transformer load box Download PDFInfo
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- CN215641777U CN215641777U CN202120660454.7U CN202120660454U CN215641777U CN 215641777 U CN215641777 U CN 215641777U CN 202120660454 U CN202120660454 U CN 202120660454U CN 215641777 U CN215641777 U CN 215641777U
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Abstract
The application discloses a load box of a current transformer, which relates to the technical field of transformer tests and comprises a shell and a display unit, wherein a control unit, a resistance circuit unit, a relay unit, an overheating alarm unit and a temperature monitoring unit are arranged in the shell; the display unit is bidirectionally connected with the control unit; the output end of the control unit is respectively connected with the input end of the overheating alarm unit and the input end of the relay; the output end of the relay is connected with the input end of the resistance circuit unit, the output end of the resistance circuit unit is connected with the input end of the temperature monitoring unit, and the output end of the temperature monitoring unit is connected with the input end of the control unit. The current transformer load box can continuously work for more than 1 hour at 150% of rated current, and the error accuracy and stability of the test can be ensured; the overload test device can also be used for carrying out the overload test on the current transformer together with other equipment for the overload test of the current transformer, and provides technical support for the overload and error test of the current transformer.
Description
Technical Field
The application relates to the technical field of mutual inductor tests, in particular to a load box of a current mutual inductor.
Background
A current transformer is a transformer intended to transmit information signals to measuring instruments, meters and protection or control devices or similar electrical appliances. The mutual inductor can convert large current into small current for measuring or protecting system. The accuracy of the current transformer is related to the fairness and justice of trade settlement among distribution, supply and use, and the reliable operation of the current transformer is related to the power utilization safety of a power grid.
The Q/CSG1209011-2016 technical specification for measuring current transformers of 35kV and below specifies that an overload capacity test of the current transformer requires that the current transformer works for a long time under 150% rated primary current, and an error of the current transformer is measured, wherein the error is required to meet the requirement of a regulation limit value.
The current transformer load box is used for carrying out overload capacity tests of the current transformer. The current transformer load box belongs to a precise instrument, and heat brought by long-time work can seriously influence the error characteristic of the current transformer load box and even burn out equipment. Due to the fact that a plurality of testing mechanisms lack a current transformer load box capable of operating at 150% rated current for a long time, overload tests of the current transformers are difficult to effectively conduct and even impossible to conduct, and evaluation and judgment of the quality of the network-connected current transformers are affected.
SUMMERY OF THE UTILITY MODEL
The application provides a current transformer load box to solve the problem that error accuracy is low because of long-term work under 150% rated current condition of current transformer load box.
The technical scheme adopted by the application is as follows:
a load box of a current transformer comprises a shell and a display unit, wherein a control unit, a resistance circuit unit, a relay unit, an overheating alarm unit and a temperature monitoring unit are arranged in the shell;
the display unit is in bidirectional communication connection with the control unit;
the output end of the control unit is respectively connected with the input end of the overheating alarm unit and the input end of the relay;
the output end of the relay is connected with the input end of the resistance circuit unit, the output end of the resistance circuit unit is connected with the input end of the temperature monitoring unit, and the output end of the temperature monitoring unit is connected with the input end of the control unit.
Further, the control unit comprises a control main board and a communication unit, and the control main board is connected with an RS485 port of the communication unit.
Further, the resistance circuit unit includes resistances R1, R2, R3, R4, R5, and R6;
the R1 and the R2 are connected in parallel to form a first resistance unit R11; the first resistor units R11 and R3 are connected in series to form a second resistor unit R12; the second resistor unit R12 and the second resistor unit R4 are connected in series to form a third resistor unit R13; the fourth resistance unit R14 is R5; the fourth resistance units R14 and R6 are connected in series to constitute a fifth resistance unit R15.
Further, the relay unit includes a first relay unit K1, a second relay unit K2, a third relay unit K3, a fourth relay unit K4, and a fifth relay unit K5;
the first relay unit K1 and the first resistance unit R11 are connected in series to form a first group of output total load units; the second relay unit K2 and the second resistance unit R12 are connected in series to form a second group of output total load units; the third relay unit K3 and the third resistance unit R13 are connected in series to form a third group of output total load units; the fourth relay unit K4 and the fourth resistance unit R14 are connected in series to form a fourth group of output total load units; the fifth relay unit K5 and the fifth resistance unit R15 are connected in series to form a fifth group of output total load units.
Furthermore, the surfaces of the resistors R1, R2, R3, R4, R5 and R6 are all provided with heat dissipation grooves, and the power of the resistors R1, R2, R3, R4, R5 and R6 is 2-5 times of the rated power of the load box of the current transformer respectively.
Further, the temperature monitoring unit is a multi-path temperature polling instrument.
Furthermore, a power switch key, a model parameter nameplate of the current transformer load box and a display lamp of the overheating alarm unit are further arranged on the shell.
Further, a radiator is further arranged in the shell and is of a comb type.
Furthermore, the fans are installed on two opposite side faces in the shell, and the shell is further provided with a plurality of heat dissipation holes.
Further, the display unit comprises a display screen, and the display screen is a liquid crystal display screen.
The technical scheme of the application has the following beneficial effects:
the current transformer load box provided by the embodiment of the application can continuously work for more than 1 hour under 150% of rated current, and meanwhile, the error accuracy and the test stability of the test can be guaranteed not to be influenced;
the overload test of the current transformer can be carried out together with other equipment for the overload test of the current transformer, and technical support is provided for the overload and error test of the current transformer;
meanwhile, the high-power gold aluminum shell resistor, the heat dissipation plate, the fan and the heat dissipation holes are designed and used to dissipate heat of the resistor in work, and the current transformer load box can work for a long time in a 150% rated current state.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a load box of a current transformer provided in an embodiment of the present application;
fig. 2 is a circuit diagram of a load box of a current transformer according to an embodiment of the present application;
fig. 3 is a schematic diagram of a front panel of a load box of a current transformer according to an embodiment of the present application;
illustration of the drawings:
1-display screen, 2-display lamp.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "inner", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when the products of the present invention are used, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
Fig. 1 is a schematic structural diagram of a load box of a current transformer provided in an embodiment of the present application; fig. 2 is a circuit diagram of a load box of a current transformer according to an embodiment of the present application; fig. 3 is a schematic diagram of a front panel of a load box of a current transformer according to an embodiment of the present application.
The application provides a current transformer load box, including casing and display element, be provided with the control unit in the casing, resistance circuit unit, relay unit, overheated alarm unit and temperature monitoring unit.
The display unit is in bidirectional communication connection with the control unit. The output end of the control unit is respectively connected with the input end of the overheating alarm unit and the input end of the relay; the output end of the relay is connected with the input end of the resistance circuit unit, the output end of the resistance circuit unit is connected with the input end of the temperature monitoring unit, and the output end of the temperature monitoring unit is connected with the input end of the control unit.
The method comprises the following specific steps:
the control unit comprises a control mainboard and a communication unit, and the control mainboard is connected with an RS485 port of the communication unit.
The resistors in the resistor circuit unit are all high-power gold aluminum shell resistors, the surfaces of the resistors are all provided with heat dissipation grooves, the power of the resistors is 2-5 times of the rated power of the load box of the current transformer, the surplus margin is large, and the heat productivity is small.
The resistance circuit unit includes resistances R1, R2, R3, R4, R5, and R6. R1 and R2 are connected in parallel to form a first resistance unit R11; the first resistor units R11 and R3 are connected in series to form a second resistor unit R12; the second resistor unit R12 and the R4 are connected in series to form a third resistor unit R13; the fourth resistance unit R14 is R5; the fourth resistance units R14 and R6 constitute a fifth resistance unit R15 in series.
The relay unit includes a first relay unit K1, a second relay unit K2, a third relay unit K3, a fourth relay unit K4, and a fifth relay unit K5.
The first relay unit K1 and the first resistance unit R11 are connected in series to form a first group of output total load units; the second relay unit K2 and the second resistance unit R12 are connected in series to form a second group of output total load units; the third relay unit K3 and the third resistance unit R13 are connected in series to form a third group of output total load units; the fourth relay unit K4 and the fourth resistance unit R14 are connected in series to form a fourth group of output total load units; the fifth relay unit K5 and the fifth resistance unit R15 are connected in series to form a fifth group of output total load units.
When the current transformer error is measured, the communication unit receives the set demand load value and transmits the demand load value to the control unit, and the control unit controls the relay unit to carry out switching so as to access the demand load value into the tested current transformer.
The display unit comprises a display screen 1 for displaying the current, the load size and the temperature of the box body in the current state in real time. The display screen 1 is a liquid crystal display screen.
The temperature monitoring unit is a multi-channel temperature polling instrument, can monitor the temperature in the shell and the temperature of the resistance circuit unit, transmits monitored data to the control unit, and displays the monitored data on the display screen for operators to check.
The overheating alarm unit can automatically trigger the display lamp to give an alarm when the temperature in the shell exceeds a preset temperature limit value.
The shell is also internally provided with a radiator which is in a high-power, aluminum profile or comb shape and has the advantages of large sectional area, quick heat dissipation and good heat dissipation effect. The fans are arranged on the two opposite side surfaces in the shell, and the shell is also provided with a plurality of heat dissipation holes. According to actual conditions, a fan can be respectively installed on the left side and the right side in the shell, a plurality of heat dissipation holes are formed in the left side and the right side of the shell, and the heat dissipation holes are used for achieving convection between air in the shell and outside air and quickening heat dissipation speed.
The front end panel of the current transformer load box that this application embodiment provided is provided with display screen 1, the model parameter data plate of load box and display lamp 2 of overheated alarm unit. And an output end and a power switch key are arranged on the rear end panel of the current transformer load box.
And an epoxy resin plate is arranged on a bottom plate of the current transformer load box to play an insulating role.
When the secondary current of the current transformer load box is 5A and the power factor is 1.0, 5/10/15VA loads can be sequentially output; when the secondary current is 1A and the power factor is 1.0, the load box can sequentially output a load of 2.5/5 VA.
The working range of the current transformer load box is 1-150% In, and one load box has 4 groups of loads, and four current transformers can be tested simultaneously.
The current transformer load box provided by the embodiment of the application can continuously work for more than 1 hour under 150% of rated current, and meanwhile, the error accuracy and the test stability of the test can be guaranteed not to be influenced; the overload test of the current transformer can be carried out together with other equipment for the overload test of the current transformer, and technical support is provided for the overload and error test of the current transformer; meanwhile, the high-power gold aluminum shell resistor, the heat dissipation plate, the fan and the heat dissipation holes are designed and used, so that the heat dissipation of the resistor in the working process can be accelerated, and the load box can work in a 150% rated current state for a long time.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (10)
1. A load box of a current transformer is characterized by comprising a shell and a display unit, wherein a control unit, a resistance circuit unit, a relay unit, an overheating alarm unit and a temperature monitoring unit are arranged in the shell;
the display unit is in bidirectional communication connection with the control unit;
the output end of the control unit is respectively connected with the input end of the overheating alarm unit and the input end of the relay;
the output end of the relay is connected with the input end of the resistance circuit unit, the output end of the resistance circuit unit is connected with the input end of the temperature monitoring unit, and the output end of the temperature monitoring unit is connected with the input end of the control unit.
2. The current transformer load box of claim 1, wherein the control unit comprises a control mainboard and a communication unit, and the control mainboard is connected with an RS485 port of the communication unit.
3. The current transformer load box of claim 1, wherein the resistance circuit unit comprises resistances R1, R2, R3, R4, R5 and R6;
the R1 and the R2 are connected in parallel to form a first resistance unit R11; the first resistor units R11 and R3 are connected in series to form a second resistor unit R12; the second resistor unit R12 and the second resistor unit R4 are connected in series to form a third resistor unit R13; the fourth resistance unit R14 is R5; the fourth resistance units R14 and R6 are connected in series to constitute a fifth resistance unit R15.
4. The current transformer load box according to claim 3, wherein the relay units include a first relay unit K1, a second relay unit K2, a third relay unit K3, a fourth relay unit K4, and a fifth relay unit K5;
the first relay unit K1 and the first resistance unit R11 are connected in series to form a first group of output total load units; the second relay unit K2 and the second resistance unit R12 are connected in series to form a second group of output total load units; the third relay unit K3 and the third resistance unit R13 are connected in series to form a third group of output total load units; the fourth relay unit K4 and the fourth resistance unit R14 are connected in series to form a fourth group of output total load units; the fifth relay unit K5 and the fifth resistance unit R15 are connected in series to form a fifth group of output total load units.
5. The current transformer load box of claim 3 or 4, wherein the resistors R1, R2, R3, R4, R5 and R6 are provided with heat dissipation grooves on the surfaces, and the power of the resistors R1, R2, R3, R4, R5 and R6 is 2 times to 5 times of the rated power of the current transformer load box respectively.
6. The current transformer load box of claim 1, wherein the temperature monitoring unit is a multiplexed temperature polling instrument.
7. The current transformer load box according to claim 1, wherein a power switch key, a model parameter nameplate of the current transformer load box and a display lamp of the overheating alarm unit are further arranged on the shell.
8. The current transformer load box of claim 1, wherein a heat sink is further disposed within the housing, the heat sink being of a comb type.
9. The current transformer load box according to claim 1, wherein fans are installed on two opposite sides of the housing, and the housing is further provided with a plurality of heat dissipation holes.
10. The current transformer load box of claim 1, wherein the display unit comprises a display screen, and the display screen is a liquid crystal display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120660454.7U CN215641777U (en) | 2021-03-30 | 2021-03-30 | Current transformer load box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120660454.7U CN215641777U (en) | 2021-03-30 | 2021-03-30 | Current transformer load box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215641777U true CN215641777U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120660454.7U Active CN215641777U (en) | 2021-03-30 | 2021-03-30 | Current transformer load box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215641777U (en) |
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2021
- 2021-03-30 CN CN202120660454.7U patent/CN215641777U/en active Active
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