Motor protection tester

Abstract

The utility model belongs to the technical field of motor protection, and particularly relates to a motor protection tester, which comprises an alternating current 220V power supply, a self-coupling voltage regulator, a current generator, a 250V power supply output end, a 20A alternating current output end, an alternating current 50A current output end, an alternating current 200A current output end and an alternating current output current common end, a sliding terminal of the self-coupling voltage regulator is electrically connected to the primary side of the current generator, and the secondary side of the current generator is electrically connected with a 250-volt power output end, a 20-A alternating current output end, a 50-A alternating current output end, a 200-A alternating current output end and an alternating current output current common end. According to the utility model, the stable operation of a power grid under various working conditions can be ensured by testing the switching-on and switching-off time and the synchronism of the circuit breaker. In addition, potential faults can be found and eliminated in time by testing the switching-on and switching-off time and synchronism of the circuit breaker, and large-scale power failure accidents caused by equipment faults are avoided.

Description

TECHNICAL FIELD

[0001] The utility model discloses motor protection belongs to technical field, specifically related to a motor protection tester. BACKGROUND

[0002] The traditional motor protection device has the problems of low sensitivity and large error, which may lead to the failure to detect the abnormal state of the motor in time and accurately in actual application, thereby failing to effectively protect the motor. Due to the improvement of mechanical automation degree, the movement utilization rate of motor equipment is high, which leads to the increase of the damage rate of the machine and the shortening of the service life under the influence of factors such as starting time, voltage and equipment startup state. These problems show that the existing motor protection device still needs to be improved in stability and reliability. When a fault occurs, the protection device may not act or act unreliable, and it is unable to quickly remove the fault; and when no fault occurs, the protection device may misact, and these situations will all affect the safe operation of the motor. CONTENT OF THE UTILITY MODEL

[0003] In view of the technical problems of low sensitivity and large error of the traditional motor protection device, the utility model provides a motor protection tester.

[0004] In order to solve the above technical problems, the utility model adopts the technical scheme that:

[0005] A motor protection tester, characterized in that: including AC 220V power supply, autotransformer, current generator, 250V power output, 20A AC current output, AC 50A current output, AC 200A current output, AC output current common end, DC 5V power supply, conversion button, output operation button, rated setting device, overcurrent setting device, closing module, opening module, motor module, the 220V power supply is connected with autotransformer, the sliding terminal of autotransformer is electrically connected to the primary side of current generator, the secondary side of current generator is respectively connected with 250V power output, 20A AC current output, 50A AC current output, 200A AC current output and AC output current common end, the DC 5V power supply is connected in parallel between 250V power output and AC output current common end, the first gear of conversion button and the second gear of conversion button are respectively connected with DC 5V power supply, the first gear of conversion button is respectively connected with rated setting device and overcurrent setting device, the second gear of conversion button is respectively connected with rated setting device, overcurrent setting device, closing module, opening module and motor module, the third gear of conversion button, output operation button and the first gear of conversion button are electrically connected through closing module, the fourth gear of conversion button, output operation button and the first gear of conversion button are electrically connected through opening module, the fifth gear of conversion button, output operation button and the first gear of conversion button are electrically connected through motor module.

[0006] The DC 5V power supply is connected in parallel with the first time second table, the second time second table and the third time second table.

[0007] The first time second table is electrically connected with switch A phase, the second time second table is electrically connected with switch B phase, and the third time second table is electrically connected with switch C phase.

[0008] The first time second table, the second time second table and the third time second table are grounded through the reset button.

[0009] The 250V power output of the current generator is connected in parallel with the first AC voltage table between the AC output current common end, and the 250V power output is electrically connected with diode.

[0010] The diode is electrically connected with DC output switch, the DC output switch is connected in parallel with the second DC voltage table between the first AC voltage table, the DC output switch is electrically connected with the first DC power point, and the DC output switch is electrically connected with the second DC power point through the DC switch.

[0011] The AC switch, the first AC power opening point and the second AC power opening point are electrically connected in parallel.

[0012] The inductive coil is connected between the secondary side of the current generator and the 50A current output end, the AC ammeter is connected in parallel with the inductive coil, and the DC power negative electrode is electrically connected with the 50A current output end.

[0013] Compared with the prior art, the utility model has the beneficial effect that:

[0014] The circuit breaker closing and opening time and synchronism can be tested, so that the stable operation of the power grid under various working conditions can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below.

[0016] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the utility model, so they do not have technical substantive significance.

[0017] Figure 1 The circuit diagram of the utility model.

[0018] Wherein: 1 is 220-volt power supply, 2 is autotransformer voltage regulator, 3 is current generator, 4 is 250-volt power supply output end, 5 is 20A AC current output end, 6 is 50A AC current output end, 7 is 200A AC current output end, 8 is AC output current common end, 9 is DC 5V power supply, 10 is conversion button, 11 is output operation button, 12 is rated setting device, 13 is overcurrent setting device, 14 is closing module, 15 is opening module, 16 is motor module, 17 is first time second table, 18 is second time second table, 19 is third time second table, 20 is switch A phase, 21 is switch B phase, 22 is switch C phase, 23 is reset button, 24 is first AC voltage table, 25 is diode, 26 is DC output switch, 27 is second DC voltage table, 28 is first DC power supply opening point, 29 is DC switch, 30 is second DC power supply opening point, 31 is AC switch, 32 is first AC power supply opening point, 33 is second AC power supply opening point, 34 is inductor coil, 35 is AC current table, 36 is DC power supply negative pole. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments. These descriptions are only used to further explain the features and advantages of the present application and are not used to limit the claims of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] The specific implementation manners of the present application will be described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the present application but are not used to limit the scope of the present application.

[0021] The terms "first", "second" are only used for description purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specified.

[0022] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0023] A motor protection tester, such as Figure 1As shown, including 220 volts power supply 1, autotransformer 2, current generator 3, 250 volts power supply output 4, 20A AC current output 5, 50A AC current output 6, 200A AC current output 7, AC output current common end 8, DC 5V power supply 9, conversion button 10, output operation button 11, rated setting device 12, overcurrent setting device 13, closing module 14, opening module 15, motor module 16, 220 volts power supply 1 is electrically connected with autotransformer 2, the sliding terminal of autotransformer 2 is electrically connected at the primary side of current generator 3, the secondary side of current generator 3 is electrically connected with 250 volts power supply output 4, 20A AC current output 5, 50A AC current output 6, 200A AC current output 7 and AC output current common end 8 respectively, DC 5V power supply 9 is connected in parallel between 250 volts power supply output 4 and output current common end 8, DC 5V power supply 9 is electrically connected with the first gear of conversion button 10 and the second gear of conversion button 10 respectively, the first gear of conversion button 10 is electrically connected with rated setting device 12 and overcurrent setting device 13 respectively, the second gear of conversion button 10 is electrically connected with rated setting device 12, overcurrent setting device 13, closing module 14, opening module 15 and motor module 16 respectively, closing module 14 is electrically connected through the third gear of conversion button 10, output operation button 11 and the first gear of conversion button 10, opening module 15 is electrically connected through the fourth gear of conversion button 10, output operation button 11 and the first gear of conversion button 10, motor module 16 is electrically connected through the fifth gear of conversion button 10, output operation button 11 and the first gear of conversion button 10. Conversion power supply 9 is connected in parallel with first time second table 17, second time second table 18, third time second table 19. First time second table 17 is electrically connected with switch A phase 20, second time second table 18 is electrically connected with switch B phase 21, third time second table 19 is electrically connected with switch C phase 22. First time second table 17, second time second table 18, third time second table 19 are grounded through reset button 23. The 250 volts power supply output 4 of current generator 3 and output current common end 8 are connected in parallel with first AC voltage table 24, 250 volts power supply output 4 is electrically connected with diode 25. Diode 25 is electrically connected with DC output switch 26, DC output switch 26 is connected in parallel with second DC voltage table 27 between first AC voltage table 24, DC output switch 26 is electrically connected with first DC power opening point 28, DC output switch 26 is electrically connected with second DC power opening point 30 through DC switch 29. It also includes AC switch 31, first AC power opening point 32 and second AC power opening point 33, first AC power opening point 32 and second AC power opening point 33 are electrically connected at both ends of AC switch 31 respectively.The secondary side of the transformer 3 is connected with the inductive coil 34 between the 50A current output end 6, the inductive coil 34 is connected with the AC ammeter 35 in parallel, and the 50A current output end 6 is electrically connected with the DC power negative electrode 36.

[0024] The embodiment is used for testing motor protection, and can also test the breaker opening and closing synchronization. The first DC power opening point 28 and the second DC power opening point 30, the first AC power opening point 32 and the second AC power opening point 33 are newly designed, and can facilitate the opening and closing test in various places. The functions are as follows:

[0025] The 220V power supply 1 can output 0 to 200A AC current through the connection of different terminals. The 220V power supply 1 and the output current common end 8 can output 0 to 250V isolated AC power supply; the 20A current output end 5 and the output current common end 8 can output 20A AC current; the 50A current output end 6 and the output current common end 8 can output 50A AC current; and the 200A current output end 7 and the output current common end 8 can output 200A AC current.

[0026] Motor protection test of the embodiment:

[0027] The rated setting device 12 and the overcurrent setting device 13 constitute the discrimination circuit of the motor protection, and are used for setting the motor overcurrent or overload and locked rotor. When the motor starts, the current reaches 7 to 8 times of the running current. At this time, if the rated setting device 12 is set to the speed breaking current value, the speed breaking time of the motor is measured. The value is displayed on the first time second meter 17. If the rated setting device 12 is set to the rated current of the motor, when the starting current is less than the speed breaking setting value, the motor runs at a large current. At this time, the switch trips, and the long starting time of the motor is tested. The value is also displayed on the first time second meter 17. After the motor starts, the current reaches the running current, which is less than the rated current of the motor. When the motor overcurrent, overload and locked rotor occur again, the setting value of the overcurrent setting device 13 is reached, and the overcurrent setting device 13 acts. The timing instruction is sent, and the second time second meter 18 starts timing. At this time, the switch trips, and the overcurrent, overload and locked rotor time of the motor is tested. The value is displayed on the second time second meter 18.

[0028] The closing time and closing synchronization test of the embodiment:

[0029] The six contacts of the switch circuit breaker are connected with two switch A phases 20, two switch B phases 21 and two switch C phases 22 of the instrument respectively, the closing circuit is connected with the first DC power source opening point 28 and the second DC power source opening point 30 in the DC power source operation; the closing circuit is connected with the first AC power source opening point 32 and the second AC power source opening point 33 in the AC power source operation; the conversion button 10 is rotated to the closing position, the output operation button 11 is controlled, the closing time of the switch can be tested, the first time second table 17, the second time second table 18 and the third time second table 19 display the closing time of the A phase, the B phase and the C phase respectively, the three-phase time is consistent, the synchronization is 0, the maximum difference of the three-phase time is the synchronization time of the closing.

[0030] The opening time and the opening synchronization test of the embodiment:

[0031] The six contacts of the switch circuit breaker are connected with two switch A phases 20, two switch B phases 21 and two switch C phases 22 of the instrument respectively, the closing circuit is connected with the first DC power source opening point 28 and the second DC power source opening point 30 in the DC power source operation; the closing circuit is connected with the first AC power source opening point 32 and the second AC power source opening point 33 in the AC power source operation; the conversion button 10 is rotated to the closing position, the output operation button 11 is controlled, the closing time of the switch can be tested, the first time second table 17, the second time second table 18 and the third time second table 19 display the closing time of the A phase, the B phase and the C phase respectively, the three-phase time is consistent, the synchronization is 0, the maximum difference of the three-phase time is the synchronization time of the closing.

[0032] The above only details the preferred embodiment of the utility model, but the utility model is not limited to the above embodiment, within the knowledge range of the ordinary skill in the art, various changes can be made without departing from the purpose of the utility model, and various changes should be contained in the protection range of the utility model.

Claims

1. A motor protection tester, characterized in that: The invention comprises an AC 220V power supply (1), an auto-voltage regulator (2), a current generator (3), a 250V power supply output terminal (4), a 20A AC current output terminal (5), an AC 50A current output terminal (6), an AC 200A current output terminal (7), an AC output current common terminal (8), a DC 5V power supply (9), a conversion button (10), an output operation button (11), a rated setting device (12), an overcurrent setting device (13), a closing module (14), an opening module (15), a motor module Block (16), the 220V power supply (1) is electrically connected to an auto-voltage regulator (2), the sliding terminal of the auto-voltage regulator (2) is electrically connected to the primary side of the current generator (3), the secondary side of the current generator (3) is electrically connected to a 250V power supply output terminal (4), a 20A AC current output terminal (5), a 50A AC current output terminal (6), a 200A AC current output terminal (7) and an AC output current common terminal (8), the 250V power supply output terminal (4) and the AC output current common terminal (8) are electrically connected. A DC 5V power supply (9) is connected in parallel between the common end (8) and the DC 5V power supply (9), the DC 5V power supply (9) is electrically connected to the first gear of the conversion button (10) and the second gear of the conversion button (10), the first gear of the conversion button (10) is electrically connected to the rated setting device (12) and the overcurrent setting device (13), the second gear of the conversion button (10) is electrically connected to the rated setting device (12), the overcurrent setting device (13), the closing module (14), the opening module (15) and The motor module (16) is electrically connected to the first gear of the conversion button (10) through the third gear of the conversion button (10) and the output operation button (11); the opening module (15) is electrically connected to the first gear of the conversion button (10) through the fourth gear of the conversion button (10) and the output operation button (11); and the motor module (16) is electrically connected to the first gear of the conversion button (10) through the fifth gear of the conversion button (10) and the output operation button (11).

2. A motor protection tester according to claim 1, characterized in that: The DC 5V power supply (9) is connected in parallel to a first time stopwatch (17), a second time stopwatch (18), and a third time stopwatch (19).

3. A motor protection tester according to claim 2, characterized in that: The first time stopwatch (17) is electrically connected to a switch phase A (20), the second time stopwatch (18) is electrically connected to a switch phase B (21), and the third time stopwatch (19) is electrically connected to a switch phase C (22).

4. A motor protection tester according to claim 2, characterized in that: The first time stopwatch (17), the second time stopwatch (18), and the third time stopwatch (19) are all grounded via a reset button (23).

5. The motor protection tester according to claim 1, characterized in that: A first AC voltmeter (24) is connected in parallel between the 250V power supply output terminal (4) of the current generator (3) and the AC output current common terminal (8), and a diode (25) is electrically connected to the 250V power supply output terminal (4).

6. A motor protection tester according to claim 5, characterized in that: The diode (25) is electrically connected to a DC output switch (26), a second DC voltmeter (27) is connected in parallel between the DC output switch (26) and the first AC voltmeter (24), the DC output switch (26) is electrically connected to a first DC power supply opening point (28), and the DC output switch (26) is electrically connected to a second DC power supply opening point (30) via a DC switch (29).

7. The motor protection tester according to claim 1, characterized in that: It also includes an AC switch (31), a first AC power supply opening point (32) and a second AC power supply opening point (33), wherein the first AC power supply opening point (32) and the second AC power supply opening point (33) are electrically connected to both ends of the AC switch (31), respectively.

8. The motor protection tester according to claim 1, characterized in that: An inductor (34) is connected between the secondary side of the current generator (3) and the 50A current output terminal (6), the inductor (34) is connected in parallel to an AC ammeter (35), and the 50A AC current output terminal (6) is electrically connected to a negative electrode (36) of a DC power supply.

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