CN213023533U - Voltage transformer integration short circuit test system - Google Patents
Voltage transformer integration short circuit test system Download PDFInfo
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- CN213023533U CN213023533U CN202021435214.9U CN202021435214U CN213023533U CN 213023533 U CN213023533 U CN 213023533U CN 202021435214 U CN202021435214 U CN 202021435214U CN 213023533 U CN213023533 U CN 213023533U
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Abstract
The utility model provides a voltage transformer integration short circuit test system, including the switch board, the switch board includes electronic voltage regulator, multiple transformation ratio heavy current transformer, first contactor, second contactor, voltage sampling unit, current sampling and record ripples unit, time-recorder, controller and control panel. The electric voltage regulator is controlled and adjusted to provide 0-400V test voltage, the first contactor and the second contactor are controlled to realize series-parallel connection of output windings of the multi-transformation-ratio high-current transformer and access of secondary windings of a tested voltage transformer, voltage of a volume limit of 140V/357A or 70V/714A is provided for the secondary windings of the tested voltage transformer, the tested voltage transformer is excited and timed, sudden short circuit of the tested voltage transformer is simulated, timing and wave recording are carried out, and therefore the short circuit test of the tested voltage transformer is achieved. The utility model discloses an integrated design can accomplish voltage transformer short circuit bearing capacity test automatically or manually, easy operation, safe and reliable.
Description
Technical Field
The utility model relates to a voltage transformer performance test technical field, especially a voltage transformer integration short circuit test system.
Background
The voltage transformer is also called instrument transformer. It is an instrument that changes high voltage to low voltage and maintains a certain relation in phase with the original. The working principle, the construction and the wiring mode of the transformer are the same as those of a transformer, but the transformer has small capacity, and usually has dozens or hundreds of volt-amperes. Its purpose is to reduce the high voltage according to a certain proportion, make the low-voltage coil can reflect the change of the high voltage magnitude accurately, in order to solve the difficulty of high voltage measurement. At the same time, the safety of the measuring personnel, the instruments and the protective devices is ensured because the high voltage is reliably isolated.
The voltage transformer is short-circuited for the second time, so that a secondary coil generates a large short-circuit current, the voltage transformer coil is burnt, and primary and secondary breakdown can be caused, the related protection malfunction is caused, and the instrument has no indication. Because the impedance of the voltage transformer is very small, the primary side is a constant voltage power supply, and if the secondary short circuit occurs, a large short circuit current can be generated in the secondary coil under the action of the constant voltage power supply, so that the transformer is burnt, and the insulation is damaged, and the primary breakdown and the secondary breakdown are realized. National standard GB 20840.3-2013 "transformer part 3: supplementary technical requirements for electromagnetic voltage transformers state that voltage transformers should be designed and manufactured to withstand without damage the mechanical and thermal effects of external short circuits of duration 1s when excited at rated voltage. In order to verify whether the voltage transformer meets the requirements, a short circuit bearing capacity test is carried out, and the specific test requirements are as follows: 1. the initial temperature of the voltage transformer is 5-40 ℃ during the test; 2. the voltage transformer is excited on the primary side, and the secondary terminal is short-circuited; 3. the short circuit test should be performed once for 1 s; 4. and in the short circuit, the root-mean-square value of the voltage applied to the terminal of the voltage transformer is not lower than the rated voltage.
The existing voltage transformer short-circuit test device has three types: one adopts a plurality of devices to carry out combined tests; one without test power source needs external power source; still another kind comprises power control cabinet, voltage regulator, test transformer and operation panel, and equipment is scattered, the test step is loaded down with trivial details, need many times go up and down to press and manual calculation just can calculate no-load voltage to do not possess automatic timing and record ripples function.
SUMMERY OF THE UTILITY MODEL
Therefore, a voltage transformer integrated short-circuit test system is needed to perform a short-circuit test on a voltage transformer, and determine whether the voltage transformer can bear a specified short-circuit test voltage through a measured short-circuit current waveform and damage of a winding.
An object of the utility model is to provide a voltage transformer integration short circuit test system, it adopts the integrated design, can accomplish voltage transformer short circuit bearing capacity test automatically or manually, can also provide the voltage/electric current that the volume limit is different for being tested voltage transformer secondary winding.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a voltage transformer integrated short circuit test system comprises a control cabinet, wherein the control cabinet comprises a cabinet body, an electric voltage regulator, a multi-transformation-ratio high-current transformer, a first contactor, a second contactor, a voltage sampling unit, a current sampling and wave recording unit, a timer, a controller and a control panel, the electric voltage regulator, the multi-transformation-ratio high-current transformer, the first contactor, the second contactor, the voltage sampling unit, the current sampling and wave recording unit and the controller are arranged in the cabinet body, and the timer and the control panel are arranged on the surface of the cabinet body;
the input winding of the electric voltage regulator is used for connecting a test power supply, and the output winding is connected with the input winding of the multi-transformation-ratio high-current transformer; the two output windings of the multi-transformation ratio high-current transformer are used for connecting a secondary winding of a tested voltage transformer; the first contactor and the second contactor are sequentially connected with the two output windings in parallel, the first contactor is used for controlling the two output windings to be connected in series or in parallel, and the second contactor is used for short-circuiting or disconnecting the secondary winding of the tested voltage transformer; the voltage sampling unit is connected with the two output windings in parallel and is connected between the first contactor and the second contactor; the current sampling and wave recording unit is connected with the two output windings in series and is connected between the second contactor and the secondary winding of the tested voltage transformer; the timer is connected with the second contactor;
the electric voltage regulator, the first contactor, the second contactor, the voltage sampling unit, the current sampling and wave recording unit and the timer are all connected with the controller and the control panel.
Furthermore, a human-computer interaction interface is arranged on the control panel.
Furthermore, a boosting button, a voltage reducing button, a series button, a parallel button, an opening button, a closing button and a timing button are arranged on the control panel, and the boosting button and the voltage reducing button are connected with the electric voltage regulator; the series button and the parallel button are connected with the first contactor; the opening button is connected with the second contactor; and the closing button and the timing button are connected with the second contactor.
Furthermore, the capacity of the multi-transformation-ratio large-current transformer is 50kVA, and the transformation ratio of the two output windings is 400V: 70V.
Further, the electric voltage regulator outputs 0-400V test voltage.
Furthermore, an input voltmeter, an input ammeter, an output voltmeter and an output ammeter are further arranged on the control panel, the input voltmeter is connected with an input winding of the electric voltage regulator in parallel, the input ammeter is connected with the electric voltage regulator in series, the output voltmeter is connected with an output winding of the electric voltage regulator in parallel, and the output ammeter is connected with an output winding of the electric voltage regulator in series.
Further, the switch board still includes the output panel who sets up at the cabinet body back, be provided with input terminal and output terminal on the output panel, input terminal is connected with electronic voltage regulator input winding, and output terminal is connected with the great current transformer output winding of multiple transformation ratio.
Further, still be provided with automatic step-down button on the control panel, automatic step-down button is connected with electronic voltage regulator.
Furthermore, a power switch, an emergency stop switch, a power lamp, a zero position lamp and a USB interface are also arranged on the control panel.
Furthermore, universal wheels are installed at the bottom of the control cabinet.
Compared with the prior art, the utility model discloses following beneficial effect has: (1) the movable integrated design is adopted, so that the use is more convenient and faster; (2) the device has the functions of timing and wave recording; (3) the multi-transformation ratio large-current transformer adopts a double-winding design, can flexibly realize series-parallel connection according to requirements, provides voltages/currents with different quantity limits for a secondary winding of a tested voltage transformer, and has wide application range; (4) the intelligent and automatic double-operation system has the advantages of full-automatic and manual double-operation modes, high intelligence and reliability, simple operation, safety and reliability.
Drawings
Fig. 1 is an electrical schematic diagram of a voltage transformer integrated short circuit test system according to an embodiment of the present invention;
fig. 2 is a front view of a control cabinet according to an embodiment of the present invention;
fig. 3 is a back view of a control cabinet according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control cabinet according to an embodiment of the present invention, in which a part of the internal structure is shown;
FIG. 5 is a schematic structural view of the mounting bracket;
FIG. 6 is an enlarged schematic view of the control panel;
fig. 7 is an enlarged schematic view of the output panel.
Wherein, 1 cabinet body; 2 an electric voltage regulator; 3 a high-current transformer with multiple transformation ratios; 4, mounting a frame; 5 a first contactor; 6 a second contactor; 7a control panel; 8, a timer; 9 universal wheels; 10 output panel.
Detailed Description
The invention will be further described with reference to specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The embodiment of the utility model provides a 10-35kV voltage transformer integration short circuit test system, including the switch board, the switch board has functions such as control buck-boost, timing, record ripples, winding short circuit, divide-shut brake, scram, parameter display, is the control center of system.
As shown in fig. 2 to 5, the control cabinet includes a cabinet body 1, an electric voltage regulator 2, a multi-transformation ratio high-current transformer 3, a first contactor 5, a second contactor 6, a voltage sampling unit, a current sampling and wave recording unit, a timer 8, a controller and a control panel 7. Electric voltage regulator 2, multiple-transformation ratio heavy current transformer 3, first contactor 5, second contactor 6, voltage sampling unit, current sampling and record ripples unit and controller setting are internal at the cabinet, and time-recorder 8 and control panel 7 set up in 1 surface of the cabinet body, and entire system is the integrated design. The transformer 3 is fixed inside the cabinet 1 through the mounting rack 4 with sawtooth grooves, and the output winding is led out from the window of the cabinet 1. The electric voltage regulator 2 is arranged on the left side in the cabinet body 1.
Fig. 1 is the electric schematic diagram of the voltage transformer integrated short circuit test system of the embodiment of the utility model. The input winding of the electric voltage regulator is connected with a test power supply to output test voltage, and the output winding is connected with the input winding of the multi-transformation-ratio high-current transformer. And the output winding of the multi-transformation ratio high-current transformer is connected with the secondary winding of the tested voltage transformer. The first contactor, the second contactor, the voltage sampling unit and the two output windings of the multi-transformation ratio large-current transformer are connected in parallel. The current sampling and wave recording unit is connected in series with two output windings of the multi-transformation ratio high-current transformer. The timer is connected with the second contactor. The electric voltage regulator, the first contactor, the second contactor, the voltage sampling unit, the current sampling and wave recording unit and the timer are all connected to the controller and the control panel.
The electric voltage regulator is used for providing adjustable test voltage for the multi-transformation ratio high-current transformer. The electric voltage regulator comprises a voltage regulator, a motor and an overcurrent protection relay.
The multi-transformation ratio high-current transformer is used for providing voltage/current for a tested voltage transformer and simulating short-circuit voltage/current under the condition of short circuit. The two output windings of the multi-transformation-ratio high-current transformer can provide voltage/current with different quantity limits to the secondary winding of the tested voltage transformer by controlling the series-parallel connection of the two output windings.
The first contactor is used for controlling the series-parallel connection of the two output windings of the multi-transformation ratio high-current transformer.
The second contactor is used for carrying out short circuit on the secondary winding of the tested voltage transformer or disconnecting the short-circuited secondary winding of the tested voltage transformer.
The voltage sampling unit is used for collecting the short-circuit voltage of the tested voltage transformer and transmitting the short-circuit voltage to the controller or the control panel.
The current sampling and wave recording unit is used for collecting the short-circuit current and the wave form of the tested voltage transformer and transmitting the short-circuit current and the wave form to the controller or the control panel.
The timer is used for counting down the short-circuit time of the tested voltage transformer and automatically disconnecting the second contactor after the counting is finished.
The controller is used for controlling the electric voltage regulator, the first contactor, the second contactor and the timer to automatically operate and receiving signals collected by the voltage sampling unit and the current sampling and wave recording unit so as to automatically finish a voltage transformer testing short circuit test.
The control panel is used for manually controlling the electric voltage regulator, the first contactor, the second contactor and the timer and receiving signals collected by the voltage sampling unit and the current sampling and wave recording unit so as to manually complete a short-circuit test of the tested voltage transformer.
Wherein, electronic voltage regulator and multiple transformation ratio heavy current transformer are the utility model discloses the system core component, specific parameter is as follows:
electric voltage regulator:
capacity: 50 kVA;
input voltage: 380V;
output voltage: 0-400V;
and others: electric voltage regulation and overcurrent protection.
The high-current transformer with multiple transformation ratios comprises:
capacity: 50 kVA;
input voltage: 400V;
transformation ratio of two output windings: both are 400V and 70V;
output voltage/current: 140V/357A (in series) or 70V/714A (in parallel).
The utility model discloses basic operating principle: the motor of adjusting electric voltage regulator through the control cabinet control provides 0~400V test voltage for the great current transformer of multiple transformation ratio, rethread control first contactor and second contactor realize the series-parallel connection of great current transformer output winding of multiple transformation ratio and the access of being tried voltage transformer secondary winding, for being tried voltage transformer secondary winding provide the voltage of volume limit 140V 357A or 70V 714A, for being tried voltage transformer excitation and timing, the simulation is tried the proruption short circuit of voltage transformer and timing record ripples, thereby realize being tried the short circuit test of voltage transformer.
As shown in fig. 6, a human-computer interaction interface is arranged on the control panel for implementing information interaction between the system and the outside. The human-computer interaction interface comprises two short circuit test programs: automatic testing and manual testing. When the automatic test is selected, the controller controls the system to automatically perform the short-circuit test; when the manual test is selected, the short circuit test is performed through manual control of the control panel.
The human-computer interaction interface is used for inputting touch screen instructions, including selecting automatic tests or manual tests, setting short-circuit test voltage and the like, and displaying the short-circuit voltage of the tested voltage transformer acquired by the voltage sampling unit and the short-circuit current and waveform of the tested voltage transformer acquired by the current sampling and wave recording unit.
The controller receives a touch screen instruction input through a human-computer interaction interface, and executes the following operations according to the instruction: controlling the motor action of the electric voltage regulator to realize voltage increase and decrease; controlling the first contactor to enable two output windings of the multi-transformation ratio high-current transformer to be connected in parallel (or in series); controlling the second contactor to be switched on so as to carry out short circuit on the secondary winding of the tested voltage transformer; controlling a timer to time and automatically disconnecting the second contactor after closing after the time is ended; and receiving signals collected by the voltage sampling unit and the current sampling and wave recording unit, and displaying the signals in a human-computer interaction interface after analog-to-digital conversion.
As shown in fig. 6, the control panel is provided with a voltage boosting button, a voltage reducing button, a series button, a parallel button, an opening button, a closing button and a timing button. The voltage boosting button and the voltage reducing button are connected with a motor of the electric voltage regulator and are respectively used for controlling the voltage boosting and reducing of the electric voltage regulator. The series button and the parallel button are respectively used for controlling the series connection and the parallel connection of two output windings of the high-current transformer with the multiple transformation ratio. And the opening button is used for controlling the second contactor to be opened. And the closing button is used for controlling the second contactor to be closed, and the timing button is used for starting the timer to time and automatically disconnecting the second contactor after the time is timed.
When the control is carried out through the control panel, a series button or a parallel button on the control panel is manually operated, and two output windings of the multi-transformation ratio high-current transformer are connected in series or in parallel; then operating a voltage boosting or reducing button, starting the motor to run, and boosting or reducing the voltage by the electric voltage regulator; and then a closing button and a timing button are operated, the second contactor is closed, the timer, the voltage sampling unit and the current sampling and wave recording unit start working, and the second contactor is disconnected after the timer finishes timing.
The control panel is also provided with an input voltmeter, an input ammeter, an output voltmeter and an output ammeter. The input voltmeter is connected with the input winding of the electric voltage regulator in parallel, the input ammeter is connected with the electric voltage regulator in series, the output voltmeter is connected with the output winding of the electric voltage regulator in parallel, and the output ammeter is connected with the output winding of the electric voltage regulator in series.
The control panel is also provided with a power lamp, a zero position lamp, a power switch and an emergency stop switch which are all connected with the electric voltage regulator in series. The control panel is also provided with a USB interface.
As shown in fig. 3, the control cabinet is further provided with an output panel 10, and the output panel 10 is located at the back of the cabinet body 1. As shown in fig. 7, the output panel is provided with an input terminal and an output terminal, the input terminal is connected to the input winding of the electric voltage regulator, and the output terminal is connected to the output winding of the multi-ratio high-current transformer.
The output panel is also provided with a network port end and a communication end, and the network port end and the communication end are connected with the control main board of the control cabinet and are used for realizing communication with a central control room or other control systems.
As shown in FIG. 4, 4 universal wheels 9 are also installed at the bottom of the control cabinet to facilitate movement and transportation.
In addition, the warning light is still installed at the switch board top, shows green light during experimental state, is red light during fault state, is the yellow light during idle state to display system's operating condition.
Introduce below the utility model discloses the operation flow of system, the utility model discloses divide into two kinds of mode of operation: an automatic control mode (controlled by a controller) and a manual control mode (controlled by a control panel).
An automatic control mode:
(1) connecting a test power supply to an input terminal in an output panel, connecting a secondary winding of the tested voltage transformer with the output terminal in the output panel, and short-circuiting a primary winding of the tested voltage transformer to complete wiring;
(2) selecting an automatic test in a human-computer interaction interface, clicking to start after a short-circuit test voltage is set, automatically finishing the test by a system, recording current voltage and waveform under a short-circuit state, clicking to quit after the test is finished, disconnecting a test power supply, and removing a test wiring.
Manual control mode:
(1) connecting a test power supply to an input terminal in an output panel, and connecting a secondary winding of the tested voltage transformer with an output terminal in the output panel; short-circuiting the primary winding of the tested voltage transformer, and finishing wiring;
(2) selecting a manual test in a human-computer interaction interface, clicking a serial or parallel button on a control panel and then clicking a boost button after setting a short-circuit test voltage, clicking a closing button and a timing button after the output voltage reaches a test voltage setting value, starting the operation of a timer, a voltage sampling unit and a current sampling and wave recording unit, automatically opening a brake by the timer after 1s, and disconnecting a second contactor (automatically recording a current value and a current waveform under a short-circuit state by the current sampling and wave recording unit); clicking a brake separating button, automatically returning the output voltage to zero, finishing the test and clicking an exit key; and (4) removing all test connection wires after the test power supply is disconnected.
The present invention has been disclosed in the foregoing with reference to the preferred embodiments, but it is not intended to limit the present invention, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation schemes fall within the protection scope of the present invention.
Claims (10)
1. The integrated short-circuit test system for the voltage transformer is characterized by comprising a control cabinet, wherein the control cabinet comprises a cabinet body, an electric voltage regulator, a multi-transformation-ratio high-current transformer, a first contactor, a second contactor, a voltage sampling unit, a current sampling and wave recording unit, a timer, a controller and a control panel, the electric voltage regulator, the multi-transformation-ratio high-current transformer, the first contactor, the second contactor, the voltage sampling unit, the current sampling and wave recording unit and the controller are arranged in the cabinet body, and the timer and the control panel are arranged on the surface of the cabinet body;
the input winding of the electric voltage regulator is used for connecting a test power supply, and the output winding is connected with the input winding of the multi-transformation-ratio high-current transformer; the two output windings of the multi-transformation ratio high-current transformer are used for connecting a secondary winding of a tested voltage transformer; the first contactor and the second contactor are sequentially connected with the two output windings in parallel, the first contactor is used for controlling the two output windings to be connected in series or in parallel, and the second contactor is used for short-circuiting or disconnecting the secondary winding of the tested voltage transformer; the voltage sampling unit is connected with the two output windings in parallel and is connected between the first contactor and the second contactor; the current sampling and wave recording unit is connected with the two output windings in series and is connected between the second contactor and the secondary winding of the tested voltage transformer; the timer is connected with the second contactor;
the electric voltage regulator, the first contactor, the second contactor, the voltage sampling unit, the current sampling and wave recording unit and the timer are all connected with the controller and the control panel.
2. The voltage transformer integrated short circuit test system according to claim 1, wherein a man-machine interface is arranged on the control panel.
3. The voltage transformer integrated short circuit test system according to claim 1, wherein a boost button, a buck button, a series button, a parallel button, an opening button, a closing button and a timing button are arranged on the control panel, and the boost button and the buck button are connected with an electric voltage regulator; the series button and the parallel button are connected with the first contactor; the opening button is connected with the second contactor; and the closing button and the timing button are connected with the second contactor.
4. The voltage transformer integrated short-circuit test system of claim 1, wherein the capacity of the multi-ratio high-current transformer is 50kVA, and the ratio of the two output windings is 400V: 70V.
5. The voltage transformer integrated short circuit test system according to claim 1, wherein the electric voltage regulator outputs a test voltage of 0-400V.
6. The voltage transformer integrated short circuit test system according to claim 1, wherein an input voltmeter, an input ammeter, an output voltmeter and an output ammeter are further arranged on the control panel, the input voltmeter is connected with an input winding of the electric voltage regulator in parallel, the input ammeter is connected with the electric voltage regulator in series, the output voltmeter is connected with an output winding of the electric voltage regulator in parallel, and the output ammeter is connected with an output winding of the electric voltage regulator in series.
7. The voltage transformer integrated short circuit test system according to claim 1, wherein the control cabinet further comprises an output panel arranged on the back of the cabinet body, the output panel is provided with an input terminal and an output terminal, the input terminal is connected with an input winding of the electric voltage regulator, and the output terminal is connected with an output winding of the multi-transformation ratio high-current transformer.
8. The voltage transformer integrated short circuit test system according to claim 1, wherein an automatic voltage reduction button is further arranged on the control panel and connected with the electric voltage regulator.
9. The voltage transformer integrated short circuit test system according to claim 1, wherein a power switch, an emergency stop switch, a power lamp, a zero lamp and a USB interface are further arranged on the control panel.
10. The voltage transformer integrated short circuit test system according to claim 1, wherein universal wheels are mounted at the bottom of the control cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021435214.9U CN213023533U (en) | 2020-07-20 | 2020-07-20 | Voltage transformer integration short circuit test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021435214.9U CN213023533U (en) | 2020-07-20 | 2020-07-20 | Voltage transformer integration short circuit test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213023533U true CN213023533U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021435214.9U Active CN213023533U (en) | 2020-07-20 | 2020-07-20 | Voltage transformer integration short circuit test system |
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| Country | Link |
|---|---|
| CN (1) | CN213023533U (en) |
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2020
- 2020-07-20 CN CN202021435214.9U patent/CN213023533U/en active Active
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