Simulation test device and method for hybrid on-load tap-changer thyristor module

Abstract

The invention discloses a simulation test device for a hybrid on-load tap-changer thyristor module. The device comprises an upper computer, an adjustable power supply, a trigger power supply, a sample module and a measurement module, the upper computer can send a control command to the adjustable power supply and the trigger power supply; the adjustable power supply applies current and voltage to the sample module; the trigger power supply provides trigger current for the sample module; the test object module is composed of two thyristors which are connected in an anti-parallel mode and peripheral circuits of the thyristors. The test module comprises a current probe and a differential voltage probe and can send test data to the upper computer. According to the simulation test device provided by the invention, a few devices are needed, functions can be added according to requirements, and the simulation test device has higher applicability.

Description

Technical Field

[0001] The invention relates to a simulation test device, and more particularly to a simulation test device and method for a hybrid on-load tap-changer thyristor module. Background Art

[0002] The hybrid transformer on-load tap-changer with thyristor-assisted arc extinguishing adds a thyristor module to the ordinary oil-immersed on-load tap-changer. During switching, the thyristor module replaces the mechanical contact for continuous current flow, which has the advantage of reducing contact erosion and transformer oil pollution. In the hybrid on-load tap-changer, the thyristor module is the core component, and the working conditions of the thyristor module in the hybrid on-load tap-changer are significantly different from other scenarios. It is very meaningful to develop its test method.

[0003] Since the thyristor module in the hybrid on-load tap-changer only continues current during the switching process and will exit the operating circuit when the switch is not in operation, its on-current condition is significantly different from the on-state average current specified in the existing standards. Therefore, a technology is needed to perform a simulation test on the thyristor module of the hybrid on-load tap-changer to assess the operating reliability of the thyristor module in the hybrid on-load tap-changer. Summary of the invention

[0004] The technical solution of the present invention provides a simulation test device for a hybrid on-load tap changer thyristor module to solve the problem of how to perform a simulation test on the hybrid on-load tap changer thyristor module.

[0005] In order to solve the above problems, the present invention provides a simulation test device for a hybrid on-load tap changer thyristor module, the device comprising: a host computer, an adjustable power supply, a trigger power supply, a measurement module and a test module, wherein:

[0006] The host computer sends control commands to the adjustable power supply and the trigger power supply to control the measurement process and receive the measurement data returned by the measurement module;

[0007] The adjustable power supply applies current and voltage to the test module;

[0008] The trigger power supply provides a trigger current to the test module;

[0009] The measurement module includes a current probe and a differential voltage probe, and sends measurement data to the host computer;

[0010] The test module is composed of two anti-parallel thyristors and their peripheral circuits.

[0011] In the above-mentioned simulation test device for a hybrid on-load tap changer thyristor module, the current and voltage that the adjustable power supply can adjustably apply to the thyristor to the test module are simulated on-state average current and forward / reverse peak voltage.

[0012] In the above-mentioned simulation test device for a hybrid on-load tap changer thyristor module, the trigger power supply is composed of trigger power supplies that provide trigger currents to the thyristors respectively.

[0013] In the above-mentioned simulation test device for a hybrid on-load tap changer thyristor module, the current probe of the measuring module is used to measure the thyristor leakage current, and the differential voltage probe of the measuring module is used to measure the on-state voltage drop of the thyristor.

[0014] In the above-mentioned simulation test device for a hybrid on-load tap-changer thyristor module, the peripheral circuit of the test module includes a gate current limiting resistor and a gate protection diode.

[0015] The present invention also provides a test method of the simulation test device according to claim 1, comprising the following steps:

[0016] Step 301, connecting the test module with the host computer, the adjustable power supply, the trigger power supply and the measurement module, inputting the stage voltage and the load current, and calculating the maximum peak current of the thyristor;

[0017] Step 302, setting the adjustable power supply output current, the maximum peak current I M Apply to the test module, and set the first trigger power supply and the second trigger power supply to output trigger current at the same time, so that the thyristor continues to flow until SCR1 and SCR2 reach the rated junction temperature;

[0018] Step 303, testing the on-state voltage drop of thyristor SCR1 and thyristor SCR2, repeating 10 times to calculate the average on-state voltage drop;

[0019] Step 304, setting the output voltage of the adjustable power supply, applying the forward peak voltage to the test module, testing the forward leakage current of SCR1 and SCR2, and repeating several times;

[0020] Step 305, setting the output voltage of the adjustable power supply, applying a reverse peak voltage to the test module, testing the reverse leakage current of SCR1 and SCR2, and repeating several times.

[0021] In the test method of the above-mentioned simulation test device, in step 301, three pairs of anti-parallel thyristor modules are installed in each phase of the hybrid on-load tap changer. When the thyristor is used for freewheeling to assist arc extinguishing, the maximum current passing through is the sum of the secondary current and the circulating current in the bridging process, that is, I M =IL +I c , where I M is the maximum current flowing through the thyristor module, I L is the step current of the on-load tap changer, I c It is the circulating current during the bridging process of the on-load tap-changer.

[0022] In the test method of the above-mentioned simulation test device, in step 301, for the hybrid on-load tap changer, the instantaneous value of the circulating current is the short-circuit current of the closing switch when the step voltage is at the peak value, that is,

[0023]

[0024] Where u s (t) is the instantaneous value of the on-load tapchanger voltage, U s is the peak voltage of the on-load tapchanger, i c (t) is the instantaneous value of the circulating current of the on-load tapchanger, ω is the angular frequency, is the closing phase angle at the time of establishing the bridging process, θ is the impedance angle of the entire circuit after the bridging process is established, Z is the impedance of the entire circuit after the bridging process is established, R is the transition resistance of the on-load tap changer, L s is a tapping section inductance; α is a parameter characterizing the decay process of circulating current after bridging, and the decay time constant

[0025] In the test method of the above-mentioned simulation test device, in step 301, it is calculated that: the maximum current peak value flowing through the thyristor is Where I M is the maximum current peak value flowing through the thyristor, I L is the peak value of the step current of the on-load tap changer, U s is the peak value of the on-load tapchanger voltage, and R is the transition resistance of the on-load tapchanger.

[0026] In the above-mentioned test method of a simulation test device, the repetition is a number of times, that is, 10 times.

[0027] Due to the adoption of the above technical solution, the device includes an adjustable power supply, a trigger power supply, a test module and a measurement module; the adjustable power supply applies current and voltage to the test module; the trigger power supply provides a trigger current to the test module; the test module is composed of two anti-parallel thyristors and their peripheral circuits; the test module includes a current probe and a differential voltage probe. The simulation test device provided by the present invention requires less equipment, and functions can be added according to needs, which has stronger applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0029] Figure 1 It is a structural schematic diagram of a simulation test device for a hybrid on-load tap changer thyristor module according to a preferred embodiment of the present invention;

[0030] Figure 2 The figure is a schematic structural diagram of a simulation test device for a hybrid on-load tap changer thyristor module according to a preferred embodiment of the present invention.

[0031] Figure 3 It is a flow chart of carrying out a simulation test of a hybrid on-load tap changer thyristor module according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0032] Figure 1 The present invention provides a hybrid on-load tap changer thyristor module simulation test device, the device comprising: a host computer 101, an adjustable power supply 102, a trigger power supply 103, a measurement module 104 and a test module 105.

[0033] like Figure 1 As shown, a simulation test device for a hybrid on-load tap changer thyristor module includes: a host computer 101, an adjustable power supply 102, a trigger power supply 103, a measurement module 104 and a test module 105.

[0034] The host computer 101 sends control commands to the adjustable power supply 102 and the trigger power supply 103 , and receives measurement data returned by the measurement module 104 .

[0035] The adjustable power supply 102 applies current and voltage to the sample module 105 .

[0036] The trigger power supply 103 provides a trigger current to the sample module 105 .

[0037] The measurement module 104 includes a current probe and a differential voltage probe, and sends measurement data to the host computer 101 .

[0038] The test module 105 is composed of two anti-parallel thyristors and their peripheral circuits.

[0039] Figure 2 The present invention is a schematic diagram of a structure of a simulation test device for a hybrid on-load tap changer thyristor module according to a preferred embodiment of the present invention. The present invention is a simulation test device for a hybrid on-load tap changer thyristor module, the device comprising:

[0040] The host computer can send control commands to the adjustable power supply and trigger voltage, control the measurement process, and receive the measurement data returned by the measurement module.

[0041] Adjustable power supply that adjusts the current and voltage applied to the thyristor, simulating the on-state average current and forward / reverse peak voltage.

[0042] The trigger power supply is composed of a trigger power supply 1 and a trigger power supply 2 for providing trigger currents to thyristors SCR1 and SCR2 respectively.

[0043] The measurement module includes current probes A1 and A2 for measuring the thyristor leakage current, and differential voltage probes V1 and V2 for measuring the thyristor on-state voltage drop.

[0044] The test module is composed of thyristors SCR1, SCR2, gate current limiting resistors R1, R2, and gate protection diodes D1, D2.

[0045] Figure 3 The flowchart is a method for testing the performance of a hybrid on-load tap changer thyristor module according to a specific embodiment of the present invention.

[0046] like Figure 3 As shown, the process 300 of carrying out a hybrid on-load tap changer thyristor module simulation test according to the present invention starts from step 301 .

[0047] In step 301, the test module is connected to the host computer, the adjustable power supply, the trigger power supply and the measurement module, the input stage voltage and the load current are input, and the maximum peak current of the thyristor is calculated;

[0048] In each phase of the hybrid on-load tap-changer, three pairs of anti-parallel thyristor modules are installed. When the thyristor is used for arc extinguishing, the maximum current passing through is the sum of the secondary current and the circulating current in the bridging process. That is, I M =I L +I c

[0049] For hybrid on-load tap-changers, the instantaneous value of the circulating current is the short-circuit current when the step voltage is at its peak, i.e.

[0050]

[0051] Where, L s is the inductance of a tap section; the decay time constant

[0052] Generally R>>ωL s , Z≈2R; switching closing phase angle There is a transition process, because θ = 0, we can get: Among them, because τ is very small, quickly decays to zero. When the circuit breaker is closed, the step voltage passes through zero and there is no transition process after closing.

[0053] From this, the maximum current peak value flowing through the thyristor can be calculated as

[0054] In step 302, the output current of the adjustable power supply is set to the maximum peak current I M Apply to the test module, and set the trigger power supplies 1 and 2 to output the trigger current at the same time, so that the thyristors continue to flow current until SCR1 and SCR2 reach the rated junction temperature;

[0055] In step 303, the on-state voltage drop of SCR1 and SCR2 is tested, and the on-state average voltage drop is calculated by repeating 10 times;

[0056] In step 304, the output voltage of the adjustable power supply is set, a forward peak voltage is applied to the test module, and the forward leakage current of SCR1 and SCR2 is tested, and the test is repeated 10 times;

[0057] In step 305, the adjustable power supply output voltage is set, a reverse peak voltage is applied to the test module, and the reverse leakage current of SCR1 and SCR2 is tested, and the process is repeated 10 times.

[0058] The present application provides a simulation test device for a hybrid on-load tap changer thyristor module, wherein an adjustable power supply can simulate the working condition of the thyristor module in the hybrid on-load tap changer, thereby facilitating the testing and selection of the thyristor module.

[0059] The above-mentioned exemplary embodiments of the present invention are introduced with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0060] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

Claims

1. A simulation test device for a hybrid on-load tap changer thyristor module, characterized in that: The device includes: a host computer, an adjustable power supply, a trigger power supply, a measurement module and a test module, wherein: The host computer sends control commands to the adjustable power supply and the trigger power supply to control the measurement process and receive the measurement data returned by the measurement module; The adjustable power supply applies current and voltage to the test module; The trigger power supply provides a trigger current to the test module; The measurement module includes a current probe and a differential voltage probe, and sends measurement data to the host computer; The test module is composed of two anti-parallel thyristors and their peripheral circuits.

2. The simulation test device for a hybrid on-load tap changer thyristor module according to claim 1, characterized in that: The adjustable power supply can adjust the current and voltage applied to the thyristor by the test module to simulate the on-state average current and the forward / reverse peak voltage.

3. A simulation test device for a hybrid on-load tap changer thyristor module according to claim 1 or 2, characterized in that: The trigger power supply is composed of trigger power supplies that provide trigger currents to thyristors respectively.

4. The simulation test device for a hybrid on-load tap changer thyristor module according to claim 1, characterized in that: The current probe of the measuring module is used to measure the leakage current of the thyristor, and the differential voltage probe of the measuring module is used to measure the on-state voltage drop of the thyristor.

5. A simulation test device for a hybrid on-load tap changer thyristor module according to claim 1, characterized in that: The peripheral circuit of the test module includes a gate current limiting resistor and a gate protection diode.

6. A test method of the simulation test device as claimed in claim 1, comprising the following steps: Step 301, connecting the test module with the host computer, the adjustable power supply, the trigger power supply and the measurement module, inputting the stage voltage and the load current, and calculating the maximum peak current of the thyristor; Step 302, setting the adjustable power supply output current, the maximum peak current I M Apply to the test module, and set the first trigger power supply and the second trigger power supply to output trigger current at the same time, so that the thyristor continues to flow until SCR1 and SCR2 reach the rated junction temperature; Step 303, testing the on-state voltage drop of thyristor SCR1 and thyristor SCR2, repeating 10 times to calculate the average on-state voltage drop; Step 304, setting the output voltage of the adjustable power supply, applying the forward peak voltage to the test module, testing the forward leakage current of SCR1 and SCR2, and repeating several times; Step 305, setting the output voltage of the adjustable power supply, applying a reverse peak voltage to the test module, testing the reverse leakage current of SCR1 and SCR2, and repeating several times.

7. A test method for a simulation test device according to claim 6, characterized in that: In step 301, three pairs of anti-parallel thyristor modules are installed in each phase of the hybrid on-load tap changer. When the thyristor is used for freewheeling to assist arc extinguishing, the maximum current passing through is the sum of the secondary current and the circulating current in the bridging process, that is, I M =I L +I c , where I M is the maximum current flowing through the thyristor module, I L is the step current of the on-load tap changer, I c It is the circulating current during the bridging process of the on-load tap-changer.

8. A test method for a simulation test device according to claim 7, characterized in that: In step 301, for the hybrid on-load tap changer, the instantaneous value of the circulating current is the short-circuit current of the switch when the step voltage is at the peak value, that is, Where u s (t) is the instantaneous value of the on-load tapchanger voltage, U s is the peak voltage of the on-load tapchanger, i c (t) is the instantaneous value of the circulating current of the on-load tapchanger, ω is the angular frequency, is the closing phase angle at the time of establishing the bridging process, θ is the impedance angle of the entire circuit after the bridging process is established, Z is the impedance of the entire circuit after the bridging process is established, R is the transition resistance of the on-load tap changer, L s is a tapping section inductance; α is a parameter characterizing the decay process of circulating current after bridging, and the decay time constant 9. A test method for a simulation test device according to claim 8, characterized in that: In step 301, it is calculated that the maximum current peak value flowing through the thyristor is Where I M is the maximum current peak value flowing through the thyristor, I L is the peak value of the step current of the on-load tap changer, U s is the peak value of the on-load tapchanger voltage, and R is the transition resistance of the on-load tapchanger.

10. The test method of a simulation test device according to claim 6, characterized in that: The above-mentioned step is repeated several times, that is, 10 times.

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