Control circuit of inductance-adjustable resonance test device and inductance-adjustable resonance test device

Abstract

The utility model relates to a control circuit of an inductance-adjustable resonance test device and the inductance-adjustable resonance test device, and relates to the technical field of resonance tests. The control circuit of the inductance-adjustable resonance test device comprises a power supply loop and a plurality of functional branches connected with the power supply loop, wherein the functional branches comprise a high-voltage operation branch, a boost operation branch, a buck operation branch, a gap increasing branch, a gap reducing branch, a voltage-resistant delay branch, a sound-light alarm branch and a power supply indication branch. According to the control circuit of the inductance adjusting type resonance test device, through cooperation of the power supply loop, the high-voltage operation branch, the boost operation branch, the buck operation branch, the gap increasing branch, the gap reducing branch, the voltage-resistant delay branch, the sound-light alarm branch and the power supply indication branch, operations such as automatic boost and buck can be realized; and therefore, the safety of the power equipment during the alternating current withstand voltage test can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resonance test, in particular to a control circuit of a resonance test device and the resonance test device. BACKGROUND

[0002] The resonance test device is a device for testing the insulation performance of power equipment. Compared with the traditional power frequency withstand voltage test device, the resonance test device has the advantages of small size, light weight, small required power supply capacity, and no recovery overvoltage. Therefore, the device is widely used in the power, metallurgy, petroleum, chemical industry and other industries, and especially performs well in testing the insulation performance of power equipment.

[0003] The control circuit of the resonance test device in the related art is relatively simple in design and single in function, mainly having basic functions such as manual voltage boosting and voltage reducing. Such a control circuit is not convenient to use in the field and has low safety. Although the technology has been widely used in power equipment testing, it has low automation degree and complex operation, which is easy to cause safety hazards. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide a control circuit of a resonance test device and the resonance test device to solve the problems of inconvenient use and low safety of the control circuit of the resonance test device in the related art.

[0005] In a first aspect, the present application provides a control circuit of a resonance test device, comprising:

[0006] a power supply circuit for providing working power for each function branch of the control circuit; and a plurality of function branches connected with the power supply circuit:

[0007] a high-voltage operation branch for connecting and disconnecting a high-voltage output circuit;

[0008] a voltage boosting operation branch for boosting the output voltage of the test device;

[0009] a voltage reducing operation branch for reducing the output voltage of the test device;

[0010] an increased gap branch for increasing the gap of the reactor core to reduce the inductance value of the reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal to resonate;

[0011] a reduced gap branch for reducing the gap of the reactor core to increase the inductance value of the reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal to resonate;

[0012] The voltage endurance time branch is used for timing and displaying the voltage endurance time when the output voltage of the test device rises to the test voltage value;

[0013] The sound-light alarm branch is used for reminding the operator to pay attention to safety during the test process.

[0014] The power supply indication branch is used for indicating whether the power supply loop is powered.

[0015] In one of the embodiments, the power supply loop comprises a transformer, a first voltage-dependent resistor, a second voltage-dependent resistor, a third voltage-dependent resistor, a fourth voltage-dependent resistor, a fuse, a phase sequence relay normally open contact, one phase line and a zero line of an external three-phase four-wire power supply, wherein the phase line and the zero line are connected to two ends of a primary side of the transformer respectively; one end of the first voltage-dependent resistor is connected to the phase line, one end of the second voltage-dependent resistor is connected to the zero line, and the other end of the first voltage-dependent resistor and the other end of the second voltage-dependent resistor are connected together and grounded; one end of the third voltage-dependent resistor is connected to a secondary side of the transformer, and the other end of the third voltage-dependent resistor is grounded; one end of the fourth voltage-dependent resistor is connected to the other end of the secondary side of the transformer, and the other end of the fourth voltage-dependent resistor is grounded; the other end of the secondary side of the transformer is connected to the fuse, the phase sequence relay normally open contact and other functional branches in turn.

[0016] In one of the embodiments, the transformer is used for converting an alternating high voltage provided by a test power supply into an alternating low voltage; the first voltage-dependent resistor, the second voltage-dependent resistor, the third voltage-dependent resistor and the fourth voltage-dependent resistor are used for providing overvoltage protection; the fuse is used for providing short-circuit current and overload current protection for each functional branch; the phase sequence relay normally open contact is used for providing open-phase and phase sequence error protection; when the phase sequence of the three-phase four-wire power supply is incorrectly connected or an open-phase fault occurs, the phase sequence relay loses power, and the phase sequence relay normally open contact is opened; when the phase sequence of the three-phase four-wire power supply is correctly connected, the phase sequence relay normally open contact is closed.

[0017] In one of the embodiments, the high-voltage operation branch comprises a stop button, a high-voltage on button, a second lower limit position travel switch normally open contact, a fifth contactor, a fifth contactor normally open contact, a closing condition relay normally closed contact and a second signal lamp, wherein one end of the stop button is connected to the phase sequence relay normally open contact, and the other end of the stop button is connected to one end of the high-voltage on button; the other end of the high-voltage on button is connected to one end of the second lower limit position travel switch normally open contact; the other end of the second lower limit position travel switch normally open contact is connected to one end of the closing condition relay normally closed contact; the other end of the closing condition relay normally closed contact is connected to one end of the fifth contactor; the other end of the fifth contactor is connected to one end of the secondary side of the transformer; the second signal lamp is connected in parallel to the contactor; the fifth contactor normally open contact is connected in parallel to the high-voltage on button and the second lower limit position travel switch normally open contact.

[0018] In one of the embodiments, the stop button is a self-locking normally closed button, and the high-voltage pass button is a self-resetting momentary button. When the high-voltage pass button is pressed, the high-voltage output circuit is connected. When the stop button is pressed, the high-voltage output circuit and the boost operating branch are immediately disconnected.

[0019] In one of the embodiments, the boost operating branch includes a boost button, a first upper limit position travel switch normally closed contact, a second contactor normally closed contact, a first contactor, and a third signal lamp. One end of the boost button is connected to the other end of the stop button, and the other end of the boost button is connected to one end of the first upper limit position travel switch normally closed contact. The other end of the first upper limit position travel switch normally closed contact is connected to one end of the second contactor normally closed contact. The other end of the second contactor normally closed contact is connected to one end of the first contactor. The other end of the first contactor is connected to one end of the transformer secondary side. The third signal lamp is connected in parallel with the first contactor. The boost button is a self-resetting momentary button, and the boost operation is performed by actuating the boost button.

[0020] In one of the embodiments, the boost operating branch includes a boost button, a first upper limit position travel switch normally closed contact, a second contactor normally closed contact, a first contactor, and a third signal lamp. One end of the boost button is connected to the other end of the stop button, and the other end of the boost button is connected to one end of the first upper limit position travel switch normally closed contact. The other end of the first upper limit position travel switch normally closed contact is connected to one end of the second contactor normally closed contact. The other end of the second contactor normally closed contact is connected to one end of the first contactor. The other end of the first contactor is connected to one end of the transformer secondary side. The third signal lamp is connected in parallel with the first contactor. The boost button is a self-resetting momentary button, and the boost operation is performed by actuating the boost button.

[0021] In one of the embodiments, the boost operating branch includes a boost button, a first upper limit position travel switch normally closed contact, a second contactor normally closed contact, a first contactor, and a third signal lamp. One end of the boost button is connected to the other end of the stop button, and the other end of the boost button is connected to one end of the first upper limit position travel switch normally closed contact. The other end of the first upper limit position travel switch normally closed contact is connected to one end of the second contactor normally closed contact. The other end of the second contactor normally closed contact is connected to one end of the first contactor. The other end of the first contactor is connected to one end of the transformer secondary side. The third signal lamp is connected in parallel with the first contactor. The boost button is a self-resetting momentary button, and the boost operation is performed by actuating the boost button.

[0022] In one of the embodiments, the gap-reducing branch includes a gap-reducing button, a fourth lower limit position travel switch normally closed contact, a third contactor normally closed contact, a fourth contactor, and a sixth signal lamp, wherein one end of the gap-reducing button is connected with the phase sequence relay normally open contact, the other end of the gap-reducing button is connected with one end of the fourth lower limit position travel switch normally closed contact; the other end of the fourth lower limit position travel switch normally closed contact is connected with one end of the third contactor normally closed contact, the other end of the third contactor normally closed contact is connected with one end of the fourth contactor; the other end of the fourth contactor is connected with one end of the transformer secondary side; the sixth signal lamp is connected in parallel with the fourth contactor; the gap-reducing button is a self-resetting push button, and the gap-reducing button is jogged to perform the gap-reducing operation of the reactor core gap.

[0023] In a second aspect, the application provides a control circuit of the resonant test device.

[0024] The control circuit of the resonant test device includes a power supply circuit, and a plurality of function branches connected with the power supply circuit: a high-voltage operation branch, a voltage boosting operation branch, a voltage reducing operation branch, a gap-increasing branch, a gap-reducing branch, a withstand voltage delay branch, an audible and visual alarm branch, and a power supply indication branch, wherein the power supply circuit is used to provide working power for each function branch of the control circuit; the high-voltage operation branch is used to connect and disconnect the high-voltage output circuit; the voltage boosting operation branch is used to increase the output voltage of the test device; the voltage reducing operation branch is used to reduce the output voltage of the test device; the gap-increasing branch is used to increase the reactor core gap to reduce the inductance of the reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal to occur resonance; the gap-reducing branch is used to reduce the reactor core gap to increase the inductance of the reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal to occur resonance; the withstand voltage delay branch is used to time when the output voltage of the test device rises to the test voltage value, and display the withstand voltage duration; the audible and visual alarm branch is used to remind the operator to pay attention to safety during the test; the power supply indication branch is used to indicate whether the power supply circuit is powered. The control circuit of the resonant test device of the application can realize automatic voltage boosting, voltage reducing and other operations through the cooperation of the power supply circuit, the high-voltage operation branch, the voltage boosting operation branch, the voltage reducing operation branch, the gap-increasing branch, the gap-reducing branch, the withstand voltage delay branch, the audible and visual alarm branch, and the power supply indication branch, thereby helping to improve the safety of the power equipment during the AC withstand voltage test. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort.

[0026] Figure 1 A module schematic diagram of a control circuit of a resonant test device in some embodiments of the present application;

[0027] Figure 2 A circuit connection diagram of a control circuit of a resonant test device in some embodiments of the present application;

[0028] Figure 3 A module structure schematic diagram of a resonant test device in some embodiments of the present application.

[0029] Explanation of the accompanying drawings:

[0030] 100, power supply circuit; 200, high-voltage operation branch; 300, voltage-boosting operation branch; 400, voltage-reducing operation branch; 500, gap-increasing branch; 600, gap-decreasing branch; 700, voltage-withstanding delay branch; 800, sound-light alarm branch; 900, power supply indication branch; GB, transformer; RV1, first voltage-dependent resistor; RV2, second voltage-dependent resistor; RV3, third voltage-dependent resistor; RV4, fourth voltage-dependent resistor; FU, fuse; XJ NO , phase sequence relay normally open contact; L, phase line; N, zero line; STP, stop button; SB1, high-voltage pass button; SQ2 NO , second lower limit position travel switch normally open contact; KM5, fifth contactor; HL2, second signal lamp; KA NC , closing condition relay normally closed contact; SB2, voltage-boosting button; SQ1 NC , first upper limit position travel switch normally closed contact; KM2, second contactor; KM2 NC , second contactor normally closed contact; KM1, first contactor; HL3, third signal lamp; KT NO1 , first delay closing normally open contact; SB3, voltage-reducing button; KM5 NC1 , fifth contactor first normally closed contact; SQ2 NC , second lower limit position travel switch normally closed contact; KM1 NC , first contactor normally closed contact; HL4, fourth signal lamp; SB4, gap-increasing button; SQ3 NC , third upper limit position travel switch normally closed contact; KM4, fourth contactor; KM4 NC, fourth contactor normally closed contact; KM3, third contactor; HL5, fifth signal lamp; SB5, gap reduction button; SQ4 NC , fourth lower limit position switch normally closed contact; KM3 NC , third contactor normally closed contact; HL6, sixth signal lamp; SB6, timing button; KT, energizing delay coil; KT NO2 , second delay closing normally open contact; DL, buzzer; HL7, seventh signal lamp; KM5 NC2 , fifth contactor second normally closed contact; HL1, first signal lamp. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways from those described herein without departing from the scope of the present application and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In this application, unless otherwise expressly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] It should be noted that when an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0037] The inductive resonant withstand voltage test device is a device for testing the insulation performance of power equipment. Compared with the traditional power frequency withstand voltage test device, the inductive resonant withstand voltage test device has the advantages of small size, light weight, small required power supply capacity, and no recovery overvoltage. Therefore, the device is widely used in power, metallurgy, petroleum, chemical industry and other industries, especially in the insulation performance test of power equipment.

[0038] The control circuit design of the inductive resonant test device in the related art is relatively simple and single function, mainly having basic functions such as manual voltage boosting and voltage reducing. Such a control circuit is not convenient to use in the field, and the safety is low. Although this technology has been widely used in power equipment testing, it has low automation degree and complex operation, which is easy to cause safety hazards.

[0039] In order to solve the problem of inconvenient use and low safety of the control circuit of the inductive resonant test device in the related art, in a first aspect, with reference to Figure 1The embodiment of the application provides a control circuit of a resonant test device, which comprises a power supply circuit 100, and a plurality of function branches connected with the power supply circuit 100, namely a high-voltage operation branch 200, a voltage boosting operation branch 300, a voltage reducing operation branch 400, a gap increasing branch 500, a gap reducing branch 600, a voltage-withstanding time delay branch 700, an audible and light alarm branch 800 and a power supply indication branch 900, wherein the power supply circuit 100 is used for providing working power for each function branch of the control circuit; the high-voltage operation branch 200 is used for connecting and disconnecting a high-voltage output circuit; the voltage boosting operation branch 300 is used for boosting the output voltage of the test device; the voltage reducing operation branch 400 is used for reducing the output voltage of the test device; the gap increasing branch 500 is used for increasing the gap of the core of an electric reactor, so as to reduce the inductance value of the electric reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal, so that resonance occurs; the gap reducing branch 600 is used for reducing the gap of the core of the electric reactor, so as to increase the inductance value of the electric reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal, so that resonance occurs; the voltage-withstanding time delay branch 700 is used for timing when the output voltage of the test device rises to a test voltage value, and displaying the voltage-withstanding duration; the audible and light alarm branch 800 is used for reminding the operator to pay attention to safety during the test process; and the power supply indication branch 900 is used for indicating whether the power supply circuit 100 is powered.

[0040] The control circuit of the resonant test device in the embodiment can realize automatic voltage boosting, voltage reducing and other operations through the cooperation of the power supply circuit 100, the high-voltage operation branch 200, the voltage boosting operation branch 300, the voltage reducing operation branch 400, the gap increasing branch 500, the gap reducing branch 600, the voltage-withstanding time delay branch 700, the audible and light alarm branch 800 and the power supply indication branch 900, thereby helping to improve the safety of the power equipment during the AC voltage withstand test.

[0041] Reference Figure 2 In some embodiments, the power supply circuit 100 comprises a transformer GB, a first voltage-dependent resistor RV1, a second voltage-dependent resistor RV2, a third voltage-dependent resistor RV3, a fourth voltage-dependent resistor RV4, a fuse FU, a phase sequence relay normally open contact XJ NO , one phase line L and a zero line N of an external three-phase four-wire power supply, wherein the phase line L and the zero line N are connected with two ends of a primary side of the transformer GB respectively; one end of the first voltage-dependent resistor RV1 is connected with the phase line L, one end of the second voltage-dependent resistor RV2 is connected with the zero line N, and the other end of the first voltage-dependent resistor RV1 is connected with the other end of the second voltage-dependent resistor RV2, and then the two ends are grounded together; one end of the third voltage-dependent resistor RV3 is connected with a secondary side of the transformer GB, and the other end of the third voltage-dependent resistor RV3 is grounded; one end of the fourth voltage-dependent resistor RV4 is connected with the other end of the secondary side of the transformer GB, and the other end of the fourth voltage-dependent resistor RV4 is grounded; the other end of the secondary side of the transformer GB is sequentially connected with the fuse FU, the phase sequence relay normally open contact XJNO and other functional branches are connected.

[0042] Referring to Figure 2 In some embodiments, the transformer GB is used to convert the alternating high voltage provided by the test power supply into alternating low voltage; the first, second, third and fourth varistors RV1, RV2, RV3 and RV4 are used to provide overvoltage protection; the fuse FU provides short-circuit current and overload current protection for each functional branch; the phase sequence relay normally open contact XJ NO is used to provide open-phase and phase sequence error protection; when the phase sequence of the three-phase four-wire test power supply is incorrectly connected, or an open-phase fault occurs, the phase sequence relay loses power, and the phase sequence relay normally open contact XJ NO is opened; when the phase sequence of the three-phase four-wire test power supply is correctly connected, the phase sequence relay normally open contact XJ NO is closed.

[0043] Referring to Figure 2 In some embodiments, the high-voltage operation branch 200 includes a stop button STP, a high-voltage pass button SB1, a second lower limit position travel switch normally open contact SQ2 NO , a fifth contactor KM5, a fifth contactor KM5 normally open contact, a closing condition relay normally closed contact KA NC and a second signal light HL2, wherein one end of the stop button STP is connected to the phase sequence relay normally open contact XJ NO , the other end of the stop button STP is connected to one end of the high-voltage pass button SB1; the other end of the high-voltage pass button SB1 is connected to one end of the second lower limit position travel switch normally open contact SQ2 NO ; the other end of the second lower limit position travel switch normally open contact SQ2 NO is connected to one end of the closing condition relay normally closed contact KA NC ; the other end of the closing condition relay normally closed contact KA NC is connected to one end of the fifth contactor KM5; the other end of the fifth contactor KM5 is connected to one end of the secondary side of the transformer GB; the second signal light HL2 is connected in parallel with the contactor; the fifth contactor KM5 normally open contact is connected in parallel with the high-voltage pass button SB1, the second lower limit position travel switch normally open contact SQ2 NO .

[0044] In particular, the high-voltage operation branch 200 has a closing self-locking function. When the phase sequence of the three-phase four-wire test power supply is correctly connected, the phase sequence relay normally open contact XJ NO is closed, and the second lower limit position travel switch normally open contact SQ2 NOIn the closed state, press the high-voltage pass button SB1, the high-voltage operation branch 200 is turned on, and the fifth contactor KM5 is energized. The normally open contact of the fifth contactor KM5 is closed, and the high-voltage pass button SB1 and the second lower limit travel switch normally open contact SQ2 NO Lock, realize the continuous conduction of the high-voltage operation branch 200.

[0045] Referring to Figure 2 In some embodiments, the stop button STP is a self-locking normally closed button, and the high-voltage pass button SB1 is a self-resetting momentary button. When the high-voltage pass button SB1 is pressed, the high-voltage output circuit is connected; when the stop button STP is pressed, the high-voltage output circuit and the boost operation branch 300 are immediately disconnected.

[0046] Referring to Figure 2 In some embodiments, the boost operation branch 300 includes a boost button SB2, a first upper limit travel switch normally closed contact SQ1 NC , a second contactor normally closed contact KM2 NC , a first contactor KM1 and a third signal lamp HL3, wherein one end of the boost button SB2 is connected to the other end of the stop button STP, the other end of the boost button SB2 is connected to one end of the first upper limit travel switch normally closed contact SQ1 NC , the other end of the first upper limit travel switch normally closed contact SQ1 NC is connected to one end of the second contactor normally closed contact KM2 NC , the other end of the second contactor normally closed contact KM2 NC is connected to one end of the first contactor KM1, the other end of the first contactor KM1 is connected to one end of the transformer GB secondary side, and the third signal lamp HL3 is connected in parallel with the first contactor KM1. The boost button SB2 is a self-resetting momentary button, and the boost operation is performed by actuating the boost button SB2.

[0047] Referring to Figure 2 In some embodiments, the boost operation branch 400 includes a first delay-closed normally open contact KT NO1 , a boost button SB3, a fifth contactor first normally closed contact KM5 NC1 , a second lower limit travel switch normally closed contact SQ2 NC , a first contactor normally closed contact KM1 NC , a second contactor KM2 and a fourth signal lamp HL4, wherein one end of the first delay-closed normally open contact KT NO1 is connected to the phase sequence relay normally open contact XJ NO , the other end of the first delay-closed normally open contact KT NO1 is connected to one end of the second lower limit travel switch normally closed contact SQ2 NC , and the other end of the second lower limit travel switch normally closed contact SQ2NC The other end is connected to the normally closed contact KM1 of the first contactor. NC One end is connected; the normally closed contact of the first contactor, KM1. NC The other end is connected to one end of the second contactor KM2; the other end of the second contactor KM2 is connected to one end of the secondary side of the transformer GB; the fourth indicator light HL4 is connected in parallel with the second contactor KM2; the voltage reduction button SB3 and the first normally closed contact KM5 of the fifth contactor are connected. NC1 Each is connected to the first time-delayed normally open contact KT. NO1 Parallel connection; the step-down button SB3 is a self-resetting jog button, and the step-down operation is performed by jogging the step-down button SB3.

[0048] Specifically, the boost operation branch 300 and the buck operation branch 400 have a mutually restrictive interlocking function to prevent phase-to-phase short circuit faults in the power supply. For example, when the boost operation branch 300 is energized, the first contactor KM1 is energized, and the normally closed contact KM1 of the first contactor... NC Disconnection prevents the step-down operation branch 400 from conducting. This prevents the first delayed normally open contact KT from closing during step-up operation. NO1 Or the first normally closed contact of the fifth contactor, KM5. NC1 Or, the step-down button SB3 might be accidentally closed, causing both the step-down operation branch 400 and the step-up operation branch 300 to be energized simultaneously, resulting in a two-phase short circuit fault. For example, when the step-down operation branch 400 is energized, the second contactor KM2 is also energized, and the normally closed contact of the second contactor KM2... NC Disconnecting the circuit prevents the boost operation branch 300 from conducting. This is to prevent the closing button SB2 from being accidentally closed during the de-voltage operation, which could cause both the boost operation branch 300 and the de-voltage operation branch 400 to be energized simultaneously, resulting in a two-phase short circuit fault in the power supply.

[0049] Reference Figure 2 In some embodiments, the gap-increasing branch 500 includes a gap-increasing button SB4 and a normally closed contact SQ3 of a third upper limit limit switch. NC The fourth contactor's normally closed contact KM4 NC The third contactor KM3 and the fifth indicator light HL5, wherein one end of the gap increase button SB4 is connected to the normally open contact XJ of the phase sequence relay. NO Connect the other end of the gap increase button SB4 to the normally closed contact SQ3 of the third upper limit limit switch. NC One end is connected; the third upper limit limit switch normally closed contact SQ3 NC The other end is connected to the normally closed contact KM4 of the fourth contactor. NC One end is connected; the normally closed contact of the fourth contactor, KM4. NCThe other end is connected with one end of the third contact KM3; the other end of the third contact KM3 is connected with one end of the transformer GB secondary side; the fifth signal lamp HL5 is connected in parallel with the third contact KM3; the increase gap button SB4 is a self-resetting momentary button, and the reactor core gap increasing operation is performed by the momentary increase gap button SB4.

[0050] Referring to Figure 2 In some embodiments, the decrease gap branch 600 includes a decrease gap button SB5, a fourth lower limit position travel switch normally closed contact SQ4 NC , a third contact KM3 NC , a fourth contact KM4 and a sixth signal lamp HL6, wherein one end of the decrease gap button SB5 is connected with the phase sequence relay normally open contact XJ NO , the other end of the decrease gap button SB5 is connected with one end of the fourth lower limit position travel switch normally closed contact SQ4 NC ; the other end of the fourth lower limit position travel switch normally closed contact SQ4 NC is connected with one end of the third contact KM3 NC , the other end of the third contact KM3 NC is connected with one end of the fourth contact KM4; the other end of the fourth contact KM4 is connected with one end of the transformer GB secondary side; the sixth signal lamp HL6 is connected in parallel with the fourth contact KM4; the decrease gap button SB5 is a self-resetting momentary button, and the reactor core gap decreasing operation is performed by the momentary decrease gap button SB5.

[0051] Specifically, the increase gap branch 500 and the decrease gap branch 600 have mutual manufacturing interlocking functions to prevent the power supply two-phase interphase short circuit fault. For example, when the increase gap branch 500 is powered on, the third contact KM3 is powered on, the third contact KM3 NC is disconnected, and the decrease gap branch 600 cannot be turned on. The decrease gap button SB5 is prevented from being mistakenly closed when the increase gap branch 500 is operated, so that the decrease gap branch 600 and the increase gap branch 500 are simultaneously powered on, causing the power supply two-phase interphase short circuit fault. For another example, when the decrease gap branch 600 is powered on, the fourth contact KM4 is powered on, the fourth contact KM4 NC is disconnected, and the increase gap branch 500 cannot be turned on. The increase gap button SB4 is prevented from being mistakenly closed when the decrease gap branch 600 is operated, so that the increase gap branch 500 and the decrease gap branch 600 are simultaneously powered on, causing the power supply two-phase interphase short circuit fault.

[0052] Referring to Figure 2 In some embodiments, the voltage resistance delay branch 700 includes a timing button SB6 and a power-on delay coil KT, wherein one end of the timing button SB6 is connected with the phase sequence relay normally open contact XJ NOThe other end of the timing button SB6 is connected with one end of the energized time delay coil KT, and the other end of the energized time delay coil KT is connected with one end of the secondary side of the transformer GB. The timing button SB6 is a self-locking normally open button, and the voltage withstand time delay operation is performed by the timing button SB6.

[0053] With reference to Figure 2 In some embodiments, the sound and light alarm branch 800 comprises a second time delay closed normally open contact KT NO2 , a buzzer DL and a seventh signal lamp HL7, wherein one end of the second time delay closed normally open contact KT NO2 is connected with the phase sequence relay normally open contact XJ NO , and the other end of the second time delay closed normally open contact KT NO2 is connected with one end of the buzzer DL. The other end of the buzzer DL is connected with one end of the secondary side of the transformer GB. The seventh signal lamp HL7 is connected in parallel with the buzzer DL.

[0054] With reference to Figure 2 In some embodiments, the power supply indication branch 900 comprises a fifth contactor second normally closed contact KM5 NC2 and a first signal lamp HL1. One end of the fifth contactor second normally closed contact KM5 NC2 is connected with the phase sequence relay normally open contact XJ NO , and the other end of the fifth contactor second normally closed contact KM5 NC2 is connected with the first signal lamp HL1. The other end of the first signal lamp HL1 is connected with one end of the secondary side of the transformer GB.

[0055] With reference to Figure 2 In some embodiments, the voltage withstand test device control circuit has a zero potential boosting function. Before boosting operation, the high voltage operation branch needs to be closed first. If the output voltage of the voltage regulator is at zero potential, i.e. the voltage regulator driving motor is at the lower limit position of the stroke, the second lower limit position stroke switch normally open contact SQ2 NO is in a closed state. When the high voltage on button SB1 is pressed, the high voltage operation branch is turned on, the contactor KM5 is energized, and the fifth contactor normally open contact KM5 NO is closed, the high voltage on button SB1 and the second lower limit position stroke switch normally closed contact SQ2 NO are locked, the high voltage operation branch is closed, and the voltage withstand test device is ensured to start boosting from zero potential.

[0056] The voltage withstand test device control circuit also has a zero potential closing function. If the output voltage of the voltage regulator is not at zero potential, i.e. the voltage regulator driving motor is not at the lower limit position of the stroke, the second lower limit position stroke switch normally open contact SQ2 NOIn the off state. When the high-voltage pass button SB1 is pressed, the high-voltage operating branch cannot be turned on, the contactor KM5 is not powered on, and the fifth contactor normally open contact KM5 NO Cannot actuate closure, high-voltage operating branch cannot be self-locked on, high voltage cannot be output, and zero potential closing of the withstand voltage test device is ensured.

[0057] The withstand voltage test device control circuit also has an automatic voltage reduction function at the end of the withstand voltage time. When the boost operation reaches the test voltage, press the timing button SB6, the power-on delay coil KT is powered on, and after the set withstand voltage time, the first delay closure normally open contact KT NO1 And the second delay closure normally open contact KT NO2 Closed, the voltage reduction operation and the sound and light alarm start, and the resonant withstand voltage test device automatically reduces the voltage. At the same time, the seventh signal lamp HL7 of the sound and light alarm branch is lit, and the buzzer DL continuously emits a sound alarm to remind the staff to perform the voltage reduction operation on the resonant withstand voltage system. When the test voltage drops to zero potential, that is, the voltage regulator drive motor runs to the lower limit position, the second lower limit travel switch normally closed contact SQ2 NC Is open, the voltage reduction operation branch is powered off, and the voltage reduction operation is completed.

[0058] The withstand voltage test device control circuit has a voltage regulator voltage automatic return to zero function. When the control circuit is unexpectedly powered off and the voltage regulator output voltage does not return to zero potential, the control circuit is restarted, and the voltage reduction operation branch is automatically powered on through the fifth contactor first normally closed contact KM5 NC1 The withstand voltage device automatically reduces the voltage to zero potential, and is ready for zero potential closing and zero potential boost operation conditions.

[0059] The circuit design in the present application is reasonable, the operation logic is clear, and the reliable operation of the inductive resonant withstand voltage test device is effectively ensured, which greatly improves the control level and automation degree of the test device. In addition, it has complete functions, such as zero potential start, zero potential boost, automatic voltage reduction at the end of the withstand voltage time, and automatic voltage return to zero, which is very suitable for AC withstand voltage test of power equipment. In addition, it is easy to operate and has high safety.

[0060] In the second aspect, with reference to Figure 3In an embodiment of the present application, a kind of inductance resonance test device is provided, including the control circuit of any one of the inductance resonance test device provided in the first aspect, the inductance resonance test device further includes operator unit, electric pressure regulator unit, step-up transformer unit, adjustable reactor unit and voltage divider unit. Wherein, operator unit can control electric pressure regulator unit and adjustable reactor unit. Electric pressure regulator unit at least includes column coil with core, carbon brush, chain transmission mechanism, driving motor and limit travel switch. Electric pressure regulator utilizes the forward and reverse rotation of driving motor, and carbon brush is slid on the polishing surface of column coil by chain transmission mechanism, to adjust the polarity and amplitude of output voltage. Adjustable reactor unit includes coil with core gap, driving motor, worm gear, worm and limit travel switch. Adjustable reactor adjusts core gap by the transmission of driving motor and worm gear, worm, to change the air gap length of magnetic circuit, realize the adjustment of reactance value.

[0061] The inductance resonance test device in the present application, after being provided with the control circuit of any one of the inductance resonance test device provided in the first aspect, also has the following beneficial effects: reasonable circuit design, clear operation logic, effective guarantee of reliable operation of inductance resonance withstand voltage test device, greatly improved control level and automation degree of test device; in addition, complete functions, with zero potential start, zero potential step-up, automatic voltage reduction at the end of withstand voltage time and automatic voltage return to zero, etc. It is very suitable for AC withstand voltage test of power equipment. In addition, it is easy to operate and has high safety.

[0062] In the description of the present application, the description of the terms "some embodiments", "other embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0063] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description simple, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0064] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A control circuit for a variable inductance resonant test device, characterized by, The application relates to a high-voltage test device, which comprises: a power circuit for providing working power for each function branch of the control circuit; and a plurality of function branches connected with the power circuit: a high-voltage operation branch for turning on and off a high-voltage output circuit; a voltage-raising operation branch for raising the output voltage of a test device; a voltage-lowering operation branch for lowering the output voltage of the test device; a gap-increasing branch for increasing the gap of a reactor core to reduce the inductance of the reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal to cause resonance; a gap-decreasing branch for decreasing the gap of the reactor core to increase the inductance of the reactor, so that the capacitive reactance and the inductive reactance in the control circuit are equal to cause resonance; a withstand voltage time-delay branch for timing when the output voltage of the test device rises to a test voltage value and displaying the withstand voltage duration; an acousto-optic alarm branch for reminding an operator to pay attention to safety during a test process; a power indication branch for indicating whether the power circuit is powered.

2. The control circuit of the inductance adjustment type resonance test apparatus according to claim 1, characterized by The power circuit comprises a transformer, a first voltage-dependent resistor, a second voltage-dependent resistor, a third voltage-dependent resistor, a fourth voltage-dependent resistor, a fuse, a phase sequence relay normally open contact, one phase line and a zero line of an external three-phase four-wire power supply, wherein the phase line and the zero line are connected with two ends of a primary side of the transformer respectively; one end of the first voltage-dependent resistor is connected with the phase line, one end of the second voltage-dependent resistor is connected with the zero line, the other end of the first voltage-dependent resistor is connected with the other end of the second voltage-dependent resistor and then grounded together; one end of the third voltage-dependent resistor is connected with a secondary side of the transformer, and the other end of the third voltage-dependent resistor is grounded; one end of the fourth voltage-dependent resistor is connected with the other end of the secondary side of the transformer, and the other end of the fourth voltage-dependent resistor is grounded; the other end of the secondary side of the transformer is connected with the fuse, the phase sequence relay normally open contact and other function branches in sequence.

3. The control circuit of the inductance adjustment type resonance tester according to claim 2, wherein The transformer is used for converting an alternating-current high voltage provided by a test power supply into an alternating-current low voltage; the first voltage-dependent resistor, the second voltage-dependent resistor, the third voltage-dependent resistor and the fourth voltage-dependent resistor are used for providing overvoltage protection; and the fuse is used for providing short-circuit current and overload current protection for each function branch. The phase sequence relay normally open contact is used for providing open-phase and phase sequence error protection. When the phase sequence of the three-phase four-wire power supply is incorrectly connected or an open-phase fault occurs, the phase sequence relay loses power, and the phase sequence relay normally open contact is opened; when the phase sequence of the three-phase four-wire power supply is correctly connected, the phase sequence relay normally open contact is closed.

4. The control circuit of the inductance adjustment type resonance tester according to claim 2, wherein The high-voltage operation branch comprises a stop button, a high-voltage passing button, a second lower limit position travel switch normally open contact, a fifth contactor, a fifth contactor normally open contact, a closing condition relay normally closed contact and a second signal lamp, wherein one end of the stop button is connected with the phase sequence relay normally open contact, the other end of the stop button is connected with one end of the high-voltage passing button; the other end of the high-voltage passing button is connected with one end of the second lower limit position travel switch normally open contact; the other end of the second lower limit position travel switch normally open contact is connected with one end of the closing condition relay normally closed contact; the other end of the closing condition relay normally closed contact is connected with one end of the fifth contactor; the other end of the fifth contactor is connected with one end of the transformer secondary side; the second signal lamp is connected in parallel with the contactor; the fifth contactor normally open contact is connected in parallel with the high-voltage passing button and the second lower limit position travel switch normally open contact.

5. The control circuit of the inductance adjustment type resonance test apparatus according to claim 4, characterized by The stop button is a self-locking normally closed button, and the high-voltage passing button is a self-resetting momentary button; when the high-voltage passing button is pressed, the high-voltage output circuit is connected; when the stop button is pressed, the high-voltage output circuit and the boost operation branch are immediately disconnected.

6. The control circuit of the inductance adjustment type resonance tester according to claim 4, wherein The boost operation branch comprises a boost button, a first upper limit position travel switch normally closed contact, a second contactor normally closed contact, a first contactor and a third signal lamp, wherein one end of the boost button is connected with the other end of the stop button, the other end of the boost button is connected with one end of the first upper limit position travel switch normally closed contact; the other end of the first upper limit position travel switch normally closed contact is connected with one end of the second contactor normally closed contact; the other end of the second contactor normally closed contact is connected with one end of the first contactor; the other end of the first contactor is connected with one end of the transformer secondary side; the third signal lamp is connected in parallel with the first contactor; the boost button is a self-resetting momentary button, and the boost operation is performed by actuating the boost button.

7. The control circuit of the inductance adjustment type resonance tester according to claim 2, wherein The boost operation branch comprises a boost button, a first upper limit position travel switch normally closed contact, a second contactor normally closed contact, a first contactor and a third signal lamp, wherein one end of the boost button is connected with the other end of the stop button, the other end of the boost button is connected with one end of the first upper limit position travel switch normally closed contact; the other end of the first upper limit position travel switch normally closed contact is connected with one end of the second contactor normally closed contact; the other end of the second contactor normally closed contact is connected with one end of the first contactor; the other end of the first contactor is connected with one end of the transformer secondary side; the third signal lamp is connected in parallel with the first contactor; the boost button is a self-resetting momentary button, and the boost operation is performed by actuating the boost button. The boost operation branch comprises a boost button, a first upper limit position travel switch normally closed contact, a second contactor normally closed contact, a first contactor and a third signal lamp, wherein one end of the boost button is connected with the other end of the stop button, the other end of the boost button is connected with one end of the first upper limit position travel switch normally closed contact; the other end of the first upper limit position travel switch normally closed contact is connected with one end of the second contactor normally closed contact; the other end of the second contactor normally closed contact is connected with one end of the first contactor; the other end of the first contactor is connected with one end of the transformer secondary side; the third signal lamp is connected in parallel with the first contactor; the boost button is a self-resetting momentary button, and the boost operation is performed by actuating the boost button.

8. The control circuit of the inductance adjustment type resonance tester according to claim 2, wherein The increase gap branch includes an increase gap button, a third upper limit position travel switch normally closed contact, a fourth contactor normally closed contact, a third contactor and a fifth signal lamp, wherein one end of the increase gap button is connected with the phase sequence relay normally open contact, the other end of the increase gap button is connected with one end of the third upper limit position travel switch normally closed contact; the other end of the third upper limit position travel switch normally closed contact is connected with one end of the fourth contactor normally closed contact; the other end of the fourth contactor normally closed contact is connected with one end of the third contactor; the other end of the third contactor is connected with one end of the transformer secondary side; the fifth signal lamp is connected in parallel with the third contactor; the increase gap button is a self-resetting jog button, and the reactor core gap increase operation is performed by jogging the increase gap button.

9. The control circuit of the inductance adjustment type resonance test apparatus according to claim 8, characterized by The decrease gap branch includes a decrease gap button, a fourth lower limit position travel switch normally closed contact, a third contactor normally closed contact, a fourth contactor and a sixth signal lamp, wherein one end of the decrease gap button is connected with the phase sequence relay normally open contact, the other end of the decrease gap button is connected with one end of the fourth lower limit position travel switch normally closed contact; the other end of the fourth lower limit position travel switch normally closed contact is connected with one end of the third contactor normally closed contact, the other end of the third contactor normally closed contact is connected with one end of the fourth contactor; the other end of the fourth contactor is connected with one end of the transformer secondary side; the sixth signal lamp is connected in parallel with the fourth contactor; the decrease gap button is a self-resetting jog button, and the reactor core gap decrease operation is performed by jogging the decrease gap button.

10. A variable inductance resonant test device, characterized by, A control circuit of the inductive resonant test device according to any one of claims 1-9.

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