Debugging terminal, debugging system and medium-voltage cabinet

Abstract

The utility model provides a debugging terminal, a debugging system and a medium-voltage cabinet. The debugging terminal is used for testing a medium-voltage cabinet, the debugging terminal comprises a plurality of power frequency voltage-withstanding switches, the power frequency voltage-withstanding switches are used for connecting secondary sides of a plurality of current transformers in the medium-voltage cabinet and a plurality of output ends of secondary sides of voltage sensors in the medium-voltage cabinet, the secondary side of each current transformer comprises a plurality of windings, and the windings are connected with the output ends of the secondary sides of the voltage sensors in the medium-voltage cabinet. A power frequency voltage-withstanding switch is connected between every two windings, and at least one power frequency voltage-withstanding switch is connected between every two output ends of the secondary side of the voltage sensor. The debugging system comprises a current transformer, a multifunctional meter, a protection device, a display, a voltage sensor, a voltage transformer and a debugging terminal. The medium-voltage cabinet comprises a circuit breaker and a debugging system. According to the invention, the power-frequency voltage-withstanding switch is controlled to be switched on during the power-frequency voltage-withstanding test, wiring in the medium-voltage cabinet does not need to be changed, the test efficiency is improved, and the maintenance cost of the medium-voltage cabinet is also reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medium-voltage switchgear equipment, and in particular, to a debugging terminal, a debugging system, and a medium-voltage switchgear. Background Art

[0002] A medium-voltage switchgear is an important device used in a power system, mainly for power distribution and control. It usually consists of a circuit breaker, a disconnector, an earthing switch, a lightning arrester, a protection device, a measuring instrument, etc. Once a problem occurs in the medium-voltage switchgear, it will have a great impact on the power system. Therefore, attention should be paid to the functional debugging of the medium-voltage switchgear. The main debugging items for the medium-voltage switchgear include power frequency withstand voltage test, voltage protection function test, current protection function test, etc. At present, the commonly used method for the power frequency withstand voltage test is: after short-circuiting the windings of the secondary side of the current transformer and the sampling terminals of the live display with a short wire, a power frequency withstand voltage tester is used for the test. However, this method requires manually connecting the cables before the power frequency withstand voltage test and manually removing the connected cables when the power frequency withstand voltage test is not performed, which reduces the test efficiency of the medium-voltage switchgear and may also cause damage to the components inside the medium-voltage switchgear due to the failure to timely remove the connected cables, increasing the maintenance cost of the medium-voltage switchgear. Summary of the Utility Model

[0003] The embodiments of the present application provide a debugging terminal, a debugging system, and a medium-voltage switchgear, which can solve at least some of the above technical problems.

[0004] In a first aspect, the present application provides a debugging terminal for testing a medium-voltage switchgear, including:

[0005] A plurality of power frequency withstand voltage switches for connecting the secondary sides of a plurality of current transformers in the medium-voltage switchgear and a plurality of output terminals of the secondary side of a voltage sensor in the medium-voltage switchgear; wherein, the secondary side of each current transformer includes a plurality of windings, and a power frequency withstand voltage switch is connected between each two windings, and at least one power frequency withstand voltage switch is connected between every two output terminals of the secondary side of the voltage sensor;

[0006] Wherein, the plurality of power frequency withstand voltage switches are used to conduct simultaneously when performing a power frequency withstand voltage test on the medium-voltage switchgear, so as to short-circuit the plurality of windings of the secondary side of each current transformer and short-circuit the plurality of output terminals of the secondary side of the voltage sensor, so that during the power frequency withstand voltage test, the plurality of windings of the secondary side of each current transformer and the secondary side of the voltage sensor are prohibited from outputting current and voltage to the corresponding secondary side circuits.

[0007] In a second aspect, the present application provides a debugging system, including:

[0008] A current transformer;

[0009] Multifunctional meter;

[0010] Protection device;

[0011] Display;

[0012] Voltage sensor;

[0013] Voltage transformer;

[0014] The above-mentioned debugging terminal.

[0015] In a third aspect, the present application provides a medium-voltage switchgear, comprising:

[0016] Circuit breaker;

[0017] The above-mentioned debugging system.

[0018] The present application provides a debugging terminal, a debugging system and a medium-voltage switchgear. The debugging terminal is used to test a medium-voltage switchgear. The debugging terminal includes a plurality of power-frequency withstand voltage switches. The plurality of power-frequency withstand voltage switches are used to connect the secondary sides of a plurality of current transformers in the medium-voltage switchgear, and a plurality of output terminals of the secondary side of a voltage sensor in the medium-voltage switchgear. Wherein, the secondary side of each current transformer includes a plurality of windings, and a power-frequency withstand voltage switch is connected between each winding. At least one power-frequency withstand voltage switch is connected between every two output terminals of the secondary side of the voltage sensor. Wherein, the plurality of power-frequency withstand voltage switches are used to conduct simultaneously during the power-frequency withstand voltage test of the medium-voltage switchgear, so as to short-circuit the plurality of windings of the secondary side of each current transformer, and short-circuit the plurality of output terminals of the secondary side of the voltage sensor, so as to prohibit the plurality of windings of the secondary side of each current transformer and the secondary side of the voltage sensor from outputting current and voltage to the corresponding secondary side circuits during the power-frequency withstand voltage test. The debugging system includes a current transformer, a multifunctional meter, a protection device, a display, a voltage sensor, a voltage transformer and a debugging terminal. The present application can control the power-frequency withstand voltage switch to conduct through the debugging terminal, so as to more quickly short-circuit the plurality of windings of the secondary side of the current transformer and short-circuit the plurality of output terminals of the secondary side of the voltage sensor during the power-frequency withstand voltage test, without changing the wiring in the medium-voltage switchgear according to whether the power-frequency withstand voltage test is carried out, improving the test efficiency of testing the medium-voltage switchgear; and, it also avoids damage to the components in the medium-voltage switchgear caused by failure to timely remove the connected cables in time, reducing the maintenance cost of the medium-voltage switchgear. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a debugging terminal in an embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of a measurement circuit in a power frequency withstand voltage test in an embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of a protection circuit in a power frequency withstand voltage test in an embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of a voltage output circuit in a power frequency withstand voltage test in an embodiment of the present application.

[0024] Figure 5 It is a schematic diagram of a circuit for current protection test in an embodiment of the present application.

[0025] Figure 6 It is a schematic diagram of a circuit for voltage protection test in an embodiment of the present application.

[0026] Figure 7 It is a schematic structural diagram of a medium voltage switchgear in an embodiment of the present application.

[0027] Reference numerals of the drawings:

[0028] Debugging terminal - 1;

[0029] Power frequency withstand voltage switch - 11; First power frequency withstand voltage wiring terminal - 111; Second power frequency withstand voltage wiring terminal - 112; Current protection test wiring terminal - 12; First current protection test wiring terminal - 121; Second current protection test wiring terminal - 122; Voltage protection test wiring terminal - 13;

[0030] Debugging system - 2;

[0031] Measurement winding - 21; First end of the measurement winding - 211; Second end of the measurement winding - 212; Protection winding - 22; First end of the protection winding - 221; Second end of the protection winding - 222; Protection device - 23; Protection terminal - 231; Multimeter - 24; Measurement terminal - 241; Voltage sensor - 25; Output end - 251; Capacitor - 252; Display - 26; Voltage sampling terminal - 261; Voltage busbar - 27; Path switch - 28; Current transformer - 29;

[0032] Medium voltage cabinet - 3; Circuit breaker - 31. Specific embodiments

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0034] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings. The term "connection" in the present application mainly refers to a physical structure connection in the absence of other explanations, and may also include meanings such as direct connection or indirect connection in the case of explanations. The terms "first" and "second" in the description and claims of the present application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the term "including" and any deformation thereof are intended to cover non-exclusive inclusion.

[0035] Please refer to Figures 1-4 , Figure 1 which is a schematic structural diagram of the debugging terminal 1 in the embodiments of the present application, Figure 2 which is a schematic diagram of the measurement circuit in the power frequency withstand voltage test in the embodiments of the present application, Figure 3 which is a schematic diagram of the protection circuit in the power frequency withstand voltage test in the embodiments of the present application, Figure 4 which is a schematic diagram of the voltage output circuit in the power frequency withstand voltage test in the embodiments of the present application. As Figure 1 shown, the debugging terminal 1 is used to test a medium voltage cabinet. The debugging terminal 1 includes a plurality of power frequency withstand voltage switches 11. As Figures 2-4 shown, the plurality of power frequency withstand voltage switches 11 are used to connect the secondary sides of a plurality of current transformers 29 in the medium voltage cabinet, and a plurality of output terminals 251 on the secondary side of a voltage sensor 25 in the medium voltage cabinet. Among them, the secondary side of each current transformer 29 includes a plurality of windings, and a power frequency withstand voltage switch 11 is connected between each winding. At least one power frequency withstand voltage switch 11 is connected between every two output terminals 251 on the secondary side of the voltage sensor 25. Among them, the plurality of power frequency withstand voltage switches 11 are used to conduct simultaneously when performing a power frequency withstand voltage test on the medium voltage cabinet, so as to short-circuit the plurality of windings on the secondary side of each current transformer 29, and short-circuit the plurality of output terminals 251 on the secondary side of the voltage sensor 25, so as to prohibit the plurality of windings on the secondary side of each current transformer 29 and the secondary side of the voltage sensor 25 from outputting current and voltage to the corresponding secondary side circuits during the power frequency withstand voltage test.

[0036] Thus, the debugging terminal 1 can control the power frequency withstand voltage switch 11 to conduct, so as to short-circuit multiple windings on the secondary side of each current transformer 29 and multiple output terminals 251 on the secondary side of the voltage sensor 25 faster during the power frequency withstand voltage test, thereby prohibiting the secondary side of each current transformer 29 from outputting current and voltage through multiple windings and the secondary side of the voltage sensor 25, so that the components in the secondary side circuit corresponding to the secondary sides of multiple windings on the secondary side of each current transformer 29 and the secondary side of the voltage sensor 25 will not be damaged during the power frequency withstand voltage test, and there is no need to change the wiring in the medium voltage cabinet according to whether the power frequency withstand voltage test is carried out, improving the test efficiency of the medium voltage cabinet; moreover, it also avoids damage to the components in the medium voltage cabinet caused by failure to timely remove the connected cables in time, reducing the maintenance cost of the medium voltage cabinet.

[0037] Wherein, the current transformer 29 further includes other structures, such as the structure of the primary side, but since it is not related to the improvement of this application, it is not shown.

[0038] Moreover, in the secondary side circuits corresponding to multiple windings on the secondary side of each current transformer 29 and the secondary side of the voltage sensor 25, the secondary side circuits corresponding to multiple windings on the secondary side of each current transformer 29 refer to the circuits in which the components connected to each winding on the secondary side of each current transformer 29 are located, and the secondary side circuits corresponding to the secondary side of the voltage sensor 25 refer to the circuits in which the components connected to the secondary side of the voltage sensor 25 are located.

[0039] In some embodiments, as Figure 1 shown, the multiple power frequency withstand voltage switches 11 include multiple first power frequency withstand voltage connection terminals 111 and multiple second power frequency withstand voltage connection terminals 112, and as Figures 2-4 shown, the multiple first power frequency withstand voltage connection terminals 111 and the multiple second power frequency withstand voltage connection terminals 112 are respectively connected to both ends of the multiple windings and multiple output terminals 251 on the secondary side of the voltage sensor 25, and further connect the multiple power frequency withstand voltage switches 11 to the secondary sides of multiple current transformers 29 in the medium voltage cabinet and multiple output terminals 251 on the secondary side of the voltage sensor 25 in the medium voltage cabinet. Among them, the multiple power frequency withstand voltage switches 11 are passive normally open switches.

[0040] As described above, specifically, when performing a power frequency withstand voltage test on the medium voltage switchgear, a large voltage needs to be applied to the primary side circuit connected to the primary side winding of the current transformer 29 and the primary side of the voltage sensor 25. When applying the large voltage, the secondary side winding of the current transformer 29 will convert the current flowing through the primary side into a current on the secondary side, and the secondary side of the voltage sensor 25 will convert the voltage on the primary side into a voltage on the secondary side. The current value of the converted secondary side current and the voltage value of the secondary side voltage will exceed the maximum current value and maximum voltage value that the components in the secondary side circuit connected to the secondary side can withstand, and thus will damage the components in the secondary side circuit. Therefore, by wiring or conducting the power frequency withstand voltage switch 11, the multiple windings on the secondary side and the multiple output terminals 251 on the secondary side of the voltage sensor 25 are short-circuited to prevent the large current and large voltage output on the secondary side from damaging the components in the secondary side circuit.

[0041] In some embodiments, the debugging terminal 1 includes a controller, and the debugging terminal 1 controls the multiple power frequency withstand voltage switches 11 to conduct simultaneously through the controller.

[0042] In some embodiments, the multiple current transformers 29 include an A-phase current transformer 29, a B-phase current transformer 29, and a C-phase current transformer 29.

[0043] In some embodiments, as Figure 2 and Figure 3 shown, the multiple windings on the secondary side include a measuring winding 21 and a protection winding 22. A power frequency withstand voltage switch 11 is connected between the two ends of the measuring winding 21, and a power frequency withstand voltage switch 11 is connected between the two ends of the protection winding 22.

[0044] Thus, when the power frequency withstand voltage switch 11 conducts, it short-circuits the test winding and the protection winding 22, and further short-circuits the secondary side of each current transformer 29 to protect the secondary device during the power frequency withstand voltage test. Moreover, the power frequency withstand voltage switch 11 can be controlled by the debugging terminal 1 to conduct, so as to more quickly short-circuit the multiple windings on the secondary side of each current transformer 29 during the power frequency withstand voltage test, without changing the wiring inside the medium voltage switchgear according to whether a power frequency withstand voltage test is performed, improving the test efficiency of the medium voltage switchgear; and it also avoids damage to the components inside the medium voltage switchgear due to failure to timely remove the connected cables in time, reducing the maintenance cost of the medium voltage switchgear.

[0045] In some embodiments, as Figure 2As shown, each measuring winding 21 includes a first end and a second end. The first end 211 of each measuring winding is connected to a measuring terminal 241 of the multi-functional meter 24 in the medium-voltage switchgear cabinet, and the second end 212 of each measuring winding is connected to a measuring terminal 241 of the multi-functional meter 24. A power-frequency withstand voltage switch 11 is connected between the first end 211 and the second end of each measuring winding. When the power-frequency withstand voltage test is not carried out, the multiple power-frequency withstand voltage switches 11 are disconnected. At this time, the multi-functional meter 24 detects the current values at the first end 211 and the second end of the multiple measuring windings through the multiple measuring terminals 241. When the power-frequency withstand voltage test is carried out, the multiple power-frequency withstand voltage switches 11 are turned on. At this time, the multi-functional meter 24 cannot detect the current values at the first end 211 and the second end 212 of the multiple measuring windings through the multiple measuring terminals 241. Among them, A411 represents the secondary side circuit of the phase A current transformer 29, B411 represents the secondary side circuit of the phase B current transformer 29, C411 represents the secondary side circuit of the phase C current transformer 29, and N411 represents the secondary side circuit of the neutral point N formed by the star connection of the phase A current transformer 29, the phase B current transformer 29, and the phase C current transformer 29.

[0046] Among them, the multi-functional meter 24 is the component located in the secondary side circuit as described above. And because the multi-functional meter 24 is located in multiple secondary side circuits, it is actually equivalent to a component common to multiple secondary side circuits. Therefore, the secondary side circuit in this application refers to the circuit in the secondary side that includes components, and the components included in different secondary side circuits can be the same or different.

[0047] And, as Figure 3 shown, each protection winding 22 includes a first end and a second end. The first end 221 of each protection winding is connected to a protection terminal 231 of the protection device 23 in the medium-voltage switchgear cabinet, and the second end 222 of each protection winding is connected to a protection terminal 231 of the protection device 23. A power-frequency withstand voltage switch 11 is connected between the first end 221 and the second end of each protection winding. When the power-frequency withstand voltage test is not carried out, the multiple power-frequency withstand voltage switches 11 are disconnected. At this time, the protection device 23 detects the current values at the first end 221 and the second end of the multiple protection windings through the multiple protection terminals 231, and issues an alarm message or controls the circuit breaker in the medium-voltage switchgear cabinet to trip in case of a fault or overcurrent. When the power-frequency withstand voltage test is carried out, the multiple power-frequency withstand voltage switches 11 are turned on. At this time, the protection device 23 cannot detect the current values at the first end 221 and the second end 222 of the multiple protection windings through the multiple protection terminals 231.

[0048] Among them, the protection device 23 is the aforementioned component located in the secondary side circuit. Since the protection device 23 is located in multiple secondary side circuits, it is actually equivalent to a component shared by multiple secondary side circuits. Therefore, the secondary side circuit in this application refers to the circuit in the secondary side that includes components, and the components included in different secondary side circuits can be the same or different.

[0049] In some embodiments, as Figure 4 shown, multiple output terminals 251 on the secondary side of the voltage sensor 25 are connected to multiple voltage sampling terminals 261 of the display 26 in the medium-voltage switchgear in a one-to-one correspondence. The multiple output terminals 251 and the multiple voltage sampling terminals 261 are arranged in the same direction. A power frequency withstand voltage switch 11 is connected between every two adjacent output terminals 251, and the power frequency withstand voltage switch 11 connected between every two adjacent output terminals 251 is also connected between two adjacent voltage sampling terminals 261.

[0050] Thus, the power frequency withstand voltage switch 11 conducts during the power frequency withstand voltage test to short-circuit the voltage sampling terminals 261, and further short-circuit the voltage sampling terminals 261, so that none of the multiple output terminals 251 outputs voltage to the multiple voltage sampling terminals 261, avoiding burning out the voltage sampling terminals 261 and the display 26 due to excessive voltage output from the multiple output terminals 251 during the power frequency withstand voltage test, improving the safety during the power frequency withstand voltage test, and reducing the maintenance cost of the medium-voltage switchgear.

[0051] Among them, the display 26 is the aforementioned component located in the secondary side circuit. And, as Figure 4 shown, L1, L2, and L3 are voltage sampling terminals 261, PE is the grounding terminal (Protecting earthing), the A of the voltage sensor 25 indicates the A-phase output terminal 251, the B indicates the B-phase output terminal 251, the C indicates the C-phase output terminal 251, the voltage sensor 25 is a capacitive type, that is, the capacitor 252, and one end of the capacitor 252 is connected to the primary side and the other end is grounded.

[0052] In some embodiments, as Figure 4 shown, for two non-adjacent output terminals 251, no additional power frequency withstand voltage switch 11 is required. The power frequency withstand voltage switches 11 of two adjacent output terminals 251 that already exist can be connected in series to jointly form the power frequency withstand voltage switch 11 between the two non-adjacent output terminals 251 to short-circuit the multiple output terminals 251 when the power frequency withstand voltage switch 11 conducts.

[0053] In some embodiments, the display 26 is the live display 26 in the medium-voltage switchgear.

[0054] Please refer toFigure 5 , Figure 5 This is a schematic circuit diagram of the current protection test in the embodiment of the present application. Each protection winding 22 includes a first end and a second end. The first end 221 of each protection winding is connected to a protection terminal 231 of the protection device 23 in the medium-voltage switchgear. The second end 222 of each protection winding is connected to a protection terminal 231 of the protection device 23. A power frequency withstand voltage switch 11 is connected between the first end 221 and the second end of each protection winding. The debugging terminal 1 further includes a plurality of first current protection test connection terminals 121 and a plurality of second current protection test connection terminals 122. The plurality of first current protection test connection terminals 121 are used to be respectively connected to the first ends 221 of the plurality of protection windings. The plurality of second current protection test connection terminals 122 are used to be respectively connected to the second ends 222 of the plurality of protection windings. When performing the current protection test, one of the plurality of first current protection test connection terminals 121 and the plurality of second current protection test connection terminals 122 outputs current to one of the first ends 221 and the second ends of the plurality of protection windings, and then outputs current to the protection device 23 through one of the first ends 221 and the second ends of the plurality of protection windings to perform the current protection test.

[0055] Thus, the debugging terminal 1 can output a current analog quantity for the current protection test in the medium-voltage switchgear, facilitating on-site debugging of the medium-voltage switchgear and improving the test efficiency.

[0056] Among them, as Figure 1 shown, the plurality of first current protection test connection terminals 121 and the plurality of second current protection test connection terminals 122 together form a current protection test connection terminal 12, and the current protection test connection terminal 12 can be used as the output port of the constant current source output.

[0057] In some embodiments, as Figure 5 shown, taking the A411 circuit as an example, an alternating current is output from the second end 222 of the protection winding to the protection terminal 231-6:a1 of the protection device 23, and the current is output from the protection terminal 231-6:b1 and the output current flows into the first end 221 of the protection winding. Among them, the first end 221 and the second end 222 of the protection winding are not in an open circuit state as Figure 5 shown, and the specific connection circuit between the first end 221 and the second end 222 of the protection winding is arranged in the debugging terminal 1.

[0058] In some embodiments, the debugging terminal 1 includes a controller. The debugging terminal 1 controls, through the controller, one of the plurality of first current protection test connection terminals 121 and the plurality of second current protection test connection terminals 122 to output current to one of the first end 221 and the second end of the plurality of protection windings.

[0059] In some embodiments, the debugging terminal 1 further includes an AC current source, a first current switch, and a second current switch. The AC current source includes a first current terminal and a second current terminal. One end of the first current switch is connected to the first current terminal, and the other end of the first current switch is connected to all of the plurality of first current protection test connection terminals 121. One end of the second current switch is connected to the second current terminal, and the other end of the second current switch is connected to all of the plurality of second current protection test connection terminals 122. When performing a current protection test, the first current switch and the second current switch are turned on, so that the AC current source forms a loop with the protection device 23 through the turned-on first current switch and second current switch, and outputs current to the protection device 23 to perform a current protection test.

[0060] Thus, by controlling the turning-on of the first current switch and the second current switch, the AC current source outputs current through the first current protection test connection terminal 121 or the second current protection test connection terminal 122 when performing a current protection test, improving the test efficiency.

[0061] In some embodiments, the debugging terminal 1 includes a controller. The debugging terminal 1 controls, through the controller, the first current switch and the second current switch to be turned on, and controls the direction of the current output by the AC current source, so that one of the plurality of first current protection test connection terminals 121 and the plurality of second current protection test connection terminals 122 outputs current.

[0062] Please refer to Figure 6 , Figure 6 which is a schematic circuit diagram of the voltage protection test in the embodiments of the present application. The debugging terminal 1 further includes a plurality of voltage protection test connection terminals 13. The plurality of voltage protection test connection terminals 13 are respectively connected to a plurality of voltage small buses 27 on the secondary side of a voltage transformer in the medium-voltage switchgear. Each voltage small bus 27 is further connected to a measurement terminal 241 of a multi-function meter 24 in the medium-voltage switchgear, and is connected to a protection terminal 231 of a protection device 23 in the medium-voltage switchgear. When performing a voltage protection test, the plurality of voltage protection test connection terminals 13 output voltage to the multi-function meter 24 and the protection device 23 to perform a voltage protection test.

[0063] Therefore, the debugging terminal 1 can output voltage analog quantities for voltage protection testing in the medium-voltage switchgear, facilitating on-site debugging of the medium-voltage switchgear and improving the testing efficiency.

[0064] Among them, the multiple voltage protection test wiring terminals 13 are constant-voltage output ports. And as mentioned before, each voltage busbar 27 is also connected to a measurement terminal 241 of the multifunction meter 24 in the medium-voltage switchgear and a protection terminal 231 of the protection device 23 in the medium-voltage switchgear. Therefore, when conducting voltage protection testing, the voltage analog quantities output by the multiple voltage protection test wiring terminals 13 can be output to the multiple measurement terminals 241 and the multiple protection terminals 231, so that the multifunction meter 24 can detect voltage values within the normal range and the protection device 23 can detect excessive voltage values.

[0065] In some embodiments, when conducting voltage protection testing, each voltage busbar 27 can also be only connected to a protection terminal 231 of the protection device 23, and only the protection device 23 needs to detect excessive voltage values to test whether the protection device 23 is working properly during voltage protection testing.

[0066] Moreover, since there is no voltage on the primary side of the voltage transformer, there is no voltage output on the multiple voltage busbars 27 on the secondary side of the voltage transformer. Therefore, the multifunction meter 24 and the protection device 23 will only measure the voltage values output by the multiple voltage protection test wiring terminals 13.

[0067] Among them, as Figure 6 shown, 1YMa indicates the voltage busbar 27 of phase A of the voltage transformer, 1YMb indicates the voltage busbar 27 of phase B of the voltage transformer, 1YMc indicates the voltage busbar 27 of phase C of the voltage transformer, and 1YMn indicates the voltage busbar 27 of the neutral point N formed by the star connection of the voltage busbars 27 of phase A, phase B, and phase C of the voltage transformer.

[0068] In some embodiments, as Figure 6 shown, the debugging terminal 1 further includes a voltage source and a voltage switch. One end of the voltage switch is connected to the output terminal 251 of the voltage source, and the other end of the voltage switch is connected to multiple voltage protection test wiring terminals 13. When conducting voltage protection testing, the voltage switch is turned on, so that the voltage source is connected to the multifunction meter 24 and the protection device 23 through the turned-on voltage switch, and outputs voltage to the multifunction meter 24 and the protection device 23 for voltage protection testing.

[0069] Thus, by controlling the conduction of the voltage switch, the voltage source outputs voltage through the multiple voltage protection test connection terminals 13 during the voltage protection test, improving the test efficiency.

[0070] In some embodiments, as Figure 6 shown, a path switch 28 is provided on the connection path connecting the voltage protection test connection terminal 13 to the measurement terminal 241 and the protection terminal 231. Wherein, the path switch 28 is used to conduct during the voltage protection test, so that the voltage output by the multiple voltage protection test connection terminals 13 can be respectively conducted to the multiple protection terminals 231 of the protection device 23 and the multiple measurement terminals 241 of the multifunctional meter 24. The path switch 28 is also used to disconnect when a fault occurs in the multifunctional meter 24 and / or the protection device 23, so as to disconnect the connection path between the multiple voltage protection test connection terminals 13, the voltage busbar 27 and the measurement terminal 241 and / or the protection terminal 231.

[0071] Thus, when a fault occurs in the multifunctional meter 24 and / or the protection device 23 and disconnects, it can prevent the voltage output by the multiple voltage protection test connection terminals 13 from being conducted to the multiple protection terminals 231 of the protection device 23 and the multiple measurement terminals 241 of the multifunctional meter 24, so as to protect the multifunctional meter 24 and the protection device 23, improve the test safety of the medium-voltage switchgear, and reduce the maintenance cost of the medium-voltage switchgear.

[0072] In some embodiments, the path switch 28 is a miniature circuit breaker.

[0073] In some embodiments, the protection device 23 is used to detect the current value or voltage value output by the debugging terminal 1, and issue an alarm signal or control the circuit breaker in the medium-voltage switchgear to trip according to the detected current value or voltage value.

[0074] Thus, if the current value or voltage value detected by the protection device 23 exceeds a predetermined value, the protection device 23 will issue a corresponding alarm signal, or control the circuit breaker to trip to cut off the power supply of the medium-voltage switchgear, thereby protecting the internal components of the medium-voltage switchgear; and, this function can also be used to detect whether the protection device 23 can work properly during the current protection test or voltage protection test, so as to improve the safety of the medium-voltage switchgear.

[0075] In some embodiments, the alarm signal can be information such as sound, light, text, etc.

[0076] In some embodiments, the debugging terminal 1 and the protection device 23 are interlocked. For example, when there are unfinished test items in the medium-voltage switchgear, it is avoided that the circuit breaker is closed with live primary power, thereby avoiding mis-power transmission and causing safety accidents.

[0077] In some embodiments, the debugging terminal 1 further includes a display unit, which is configured to display the test information in the debugging terminal 1, and is further configured to select to enter or end the power frequency withstand voltage test / current protection test / voltage protection test, and set the test parameters of the power frequency withstand voltage test / current protection test / voltage protection test.

[0078] Therefore, the tester can observe the current test state of the debugging terminal 1 according to the test information displayed by the display unit, such as the test method and type, and the test parameter information, such as the magnitudes of the output current and voltage, and can better regulate the test information of the debugging terminal 1; moreover, the test category and test progress can be controlled on the display unit to enter or end the power frequency withstand voltage test / current protection test / voltage protection test, and the test parameters, such as the test time, can also be set to better achieve human-computer interaction and facilitate various tests on the medium-voltage switchgear.

[0079] As described above, it can be known that during the specific power frequency withstand voltage test, there is no need to modify the wiring inside the medium-voltage switchgear. Select the "power frequency withstand voltage test" item on the intelligent debugging terminal 1 and set the test time of the power frequency withstand voltage test. Then, the multiple power frequency withstand voltage switches 11 are turned on. At this time, the tester can perform the power frequency withstand voltage test. After the test is completed, the "power frequency withstand voltage test" item can be ended by operating on the intelligent debugging terminal 1.

[0080] Secondly, as described above, it can also be known that during the specific current protection test, there is no need to modify the wiring inside the medium-voltage switchgear. Select the "current protection test" item on the intelligent debugging terminal 1, and respectively set the current value output at the current protection test wiring terminal 12 and the duration of its output current, that is, the test time of the current protection test. If the current protection action of the current protection test is an alarm, corresponding alarm information will appear on the protection device 23. If the current protection action of the current protection test is a trip, corresponding trip information will appear on the protection device 23, and the protection device 23 controls the circuit breaker to change from closing to opening to cut off the power supply of the medium-voltage switchgear. After the current protection test is completed, the "current protection test" item can be ended by operating on the intelligent debugging terminal 1.

[0081] Next, during the specific voltage protection test, there is no need to modify the wiring inside the medium-voltage switchgear. Select the "voltage protection test" item on the intelligent debugging terminal 1, and set the voltage value output at the voltage protection test wiring terminal 13 and the duration of its output voltage as required, that is, the test time of the voltage protection test. If the voltage protection of the voltage protection test acts on the alarm, corresponding alarm information will appear on the protection device 23. If the voltage protection of the voltage protection test acts on the trip, corresponding trip information will appear on the protection device 23, and the protection device 23 controls the circuit breaker to change from closing to opening to cut off the power supply of the medium-voltage switchgear. After completing the voltage protection test, the operation can be performed on the intelligent debugging terminal 1 to end the "voltage protection test" item.

[0082] In some embodiments, the display unit is a touch screen or a control panel that can be controlled by touch operation.

[0083] In some embodiments, the display unit of the debugging terminal 1 is used to set the parameters of multiple components in the medium-voltage switchgear.

[0084] Thus, the tester can preset the parameters of each component in the connection circuit through the display unit to determine the required component models and parameters. Furthermore, before debugging, the actual components can be verified according to the set parameter information to check whether they are the required components. At the same time, according to the transformation ratios of the current transformer 29 and the voltage transformer displayed on the debugging terminal 1, the correctness of the parameters such as the current and voltage transformation ratios of the protection device 23 and the multifunction meter 24 can be rechecked before power-on to avoid a series of problems caused by incorrect transformation ratios of the current transformer 29 and the voltage transformer.

[0085] Since the tester does not understand the interlock relationship inside the medium-voltage switchgear during on-site testing, and the interlock tripping schemes of different substations are different, the tester needs to re-understand the interlock relationship inside the medium-voltage switchgear, which reduces the testing efficiency. Moreover, some personnel may damage the interlock mechanism during operation, resulting in the repair of the medium-voltage switchgear and increasing the maintenance cost of the medium-voltage switchgear.

[0086] In some embodiments, the display unit is further used to display the interlock tripping information and operation methods in the medium-voltage switchgear.

[0087] Thus, the display unit displays the interlock tripping information and operation methods in the medium-voltage switchgear, which can better guide the on-site operation and maintenance personnel to operate, avoid safety accidents and component damage caused by misoperation, reduce the maintenance cost of the medium-voltage switchgear, and improve the testing efficiency.

[0088] Such as Figures 2-6As shown, the debugging system 2 includes the aforementioned current transformer 29, multi-function meter 24, protection device 23, display 26, voltage sensor 25, voltage transformer, and debugging terminal 1.

[0089] Among them, for the specific structure of the debugging terminal 1 and its interaction relationship with the current transformer 29, multi-function meter 24, protection device 23, display 26, voltage sensor 25, and voltage transformer, reference can be made to the foregoing description, and details will not be elaborated here.

[0090] Thus, the power frequency withstand voltage switch 11 can be controlled by the debugging terminal 1 to conduct, so as to short-circuit multiple windings on the secondary side of the current transformer 29 and multiple output terminals 251 on the secondary side of the voltage sensor 25 more quickly during the power frequency withstand voltage test, without changing the wiring in the medium voltage cabinet according to whether the power frequency withstand voltage test is carried out, improving the test efficiency of the medium voltage cabinet; and also avoiding damage to the components in the medium voltage cabinet caused by failure to timely remove the connected cables in time, reducing the maintenance cost of the medium voltage cabinet.

[0091] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of the medium voltage cabinet 3 in the embodiment of the present application. The medium voltage cabinet 3 includes a circuit breaker 31 and a debugging system 2.

[0092] Among them, as described above, the circuit breaker 31 is used to change from closing to opening under the control of the protection device 23 to cut off the power supply of the medium voltage cabinet, thereby protecting the components in the medium voltage cabinet 3.

[0093] For more specific content of the debugging system 2, reference can be made to the description in the foregoing embodiment, and details will not be elaborated here.

[0094] Thus, the power frequency withstand voltage switch 11 can be controlled by the debugging terminal 1 to conduct, so as to short-circuit multiple windings on the secondary side of the current transformer 29 and multiple output terminals 251 on the secondary side of the voltage sensor 25 more quickly during the power frequency withstand voltage test, without changing the wiring in the medium voltage cabinet 3 according to whether the power frequency withstand voltage test is carried out, improving the test efficiency of the medium voltage cabinet 3; and also avoiding damage to the components in the medium voltage cabinet 3 caused by failure to timely remove the connected cables in time, reducing the maintenance cost of the medium voltage cabinet 3.

[0095] Specifically, the debugging terminal 1 is embedded on the cabinet body of the medium voltage cabinet 3. One side of the display part of the debugging terminal 1 faces the outside of the cabinet body, and the side where the power frequency withstand voltage switch 11 is provided on the debugging terminal 1 faces the inside of the cabinet of the medium voltage cabinet 3 to connect the components in the medium voltage cabinet 3 to form the debugging system 2, and then perform the power frequency withstand voltage test on the medium voltage cabinet 3.

[0096] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application; without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A debugging terminal for testing a medium voltage cabinet, characterized in that: include: A plurality of power frequency withstand voltage switches, the plurality of power frequency withstand voltage switches are used to connect the secondary sides of the plurality of current transformers in the medium voltage cabinet and the plurality of output terminals of the secondary side of the voltage sensor in the medium voltage cabinet; wherein the secondary side of each of the current transformers comprises a plurality of windings, a power frequency withstand voltage switch is connected between each winding, and at least one power frequency withstand voltage switch is connected between each two output terminals of the secondary side of the voltage sensor; Among them, the multiple power frequency withstand voltage switches are used to be turned on simultaneously when the power frequency withstand voltage test is performed on the medium voltage cabinet, so as to short-circuit the multiple windings on the secondary side of each current transformer and the multiple output ends on the secondary side of the voltage sensor, so as to prohibit the multiple windings on the secondary side of each current transformer and the secondary side of the voltage sensor from outputting current and voltage to the corresponding secondary side circuit during the power frequency withstand voltage test.

2. The debugging terminal according to claim 1, characterized in that: The multiple windings on the secondary side include a measuring winding and a protection winding. A power frequency withstand voltage switch is connected between the two ends of the measuring winding, and a power frequency withstand voltage switch is connected between the two ends of the protection winding.

3. The debugging terminal according to claim 1, characterized in that: The multiple output ends on the secondary side of the voltage sensor are connected one-to-one with the multiple voltage sampling terminals of the display in the medium voltage cabinet, the multiple output ends and the multiple voltage sampling terminals are arranged in the same direction, an industrial frequency withstand voltage switch is connected between every two adjacent output ends, and the industrial frequency withstand voltage switch connected between every two adjacent output ends is also connected between two adjacent voltage sampling terminals.

4. The debugging terminal according to claim 2, characterized in that: Each protection winding comprises a first end and a second end, the first end of each protection winding is connected to a protection terminal of a protection device in the medium voltage cabinet, the second end of each protection winding is connected to a protection terminal of the protection device, and a power frequency withstand voltage switch is connected between the first end and the second end of each protection winding; The debugging terminal also includes a plurality of first current protection test terminals and a plurality of second current protection test terminals, wherein the plurality of first current protection test terminals are used to be respectively connected to the first ends of the plurality of protection windings, and the plurality of second current protection test terminals are used to be respectively connected to the second ends of the plurality of protection windings. When performing a current protection test, one of the plurality of first current protection test terminals and the plurality of second current protection test terminals outputs current to one of the first ends and the second ends of the plurality of protection windings, and then outputs current to the protection device through one of the first ends and the second ends of the plurality of protection windings to perform a current protection test.

5. The debugging terminal according to claim 4, characterized in that: The debugging terminal also includes an AC current source, a first current switch and a second current switch. The AC current source includes a first current end and a second current end. One end of the first current switch is connected to the first current end, and the other end of the first current switch is connected to all of the multiple first current protection test terminals. One end of the second current switch is connected to the second current end, and the other end of the second current switch is connected to all of the multiple second current protection test terminals. When performing a current protection test, the first current switch and the second current switch are turned on, so that the AC current source forms a loop with the protection device through the turned-on first current switch, the second current switch, and outputs current to the protection device to perform a current protection test.

6. The debugging terminal according to claim 1, characterized in that: The debugging terminal also includes multiple voltage protection test terminals, which are respectively connected to multiple voltage busbars on the secondary side of the voltage transformer in the medium voltage cabinet. Each voltage busbar is also connected to a measurement terminal of a multi-function meter in the medium voltage cabinet, and a protection terminal of a protection device in the medium voltage cabinet. When performing a voltage protection test, the multiple voltage protection test terminals output voltage to the multi-function meter and the protection device to perform a voltage protection test.

7. The debugging terminal according to claim 6, characterized in that: The debugging terminal also includes a voltage source and a voltage switch, one end of the voltage switch is connected to the output end of the voltage source, and the other end of the voltage switch is connected to multiple voltage protection test terminals. When performing a voltage protection test, the voltage switch is turned on so that the voltage source is connected to the multi-function meter and the protection device through the turned-on voltage switch, and outputs voltage to the multi-function meter and the protection device to perform a voltage protection test.

8. The debugging terminal according to claim 7, characterized in that: A path switch is provided on the connection path between the voltage protection test terminal and the measuring terminal and the protection terminal, wherein the path switch is used to be turned on when performing a voltage protection test, so that the voltage output by the multiple voltage protection test terminals can be respectively transmitted to the multiple protection terminals of the protection device in the medium voltage cabinet and the multiple measurement terminals of the multi-function meter, and the path switch is also used to be disconnected when a fault occurs in the multi-function meter and / or the protection device, so as to disconnect the connection path between the multiple voltage protection test terminals, the voltage busbar and the measurement terminal and / or the protection terminal.

9. The debugging terminal according to claim 4 or 6, characterized in that: The protection device is used to detect the current value or voltage value output by the debugging terminal, and to send out an alarm signal or control the circuit breaker in the medium voltage cabinet to open according to the detected current value or voltage value.

10. The debugging terminal according to claim 1, characterized in that: The debugging terminal also includes a display unit, which is used to display the test information in the debugging terminal. The display unit is also used to select to enter or end the power frequency withstand voltage test / current protection test / voltage protection test, and to set the test parameters of the power frequency withstand voltage test / current protection test / voltage protection test.

11. The debugging terminal according to claim 10, characterized in that: The display unit is also used to set parameters of multiple components in the medium voltage cabinet.

12. The debugging terminal according to claim 10, characterized in that: The display unit is also used to display the interlocking information and operation method in the medium voltage cabinet.

13. A debugging system, characterized in that: include: Current transformer; Multi-function meter; Protective devices; Live display; Voltage sensor; Voltage transformer; A debugging terminal as described in any one of claims 1 to 12.

14. A medium voltage cabinet, characterized in that: include: breaker; The debugging system as claimed in claim 13.

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