Rapid test method for multi-coil CVT

Abstract

The invention provides a rapid test method for a multi-coil CVT, and the method comprises the steps: switching a controller to be connected to a mutual inductor tester, thereby enabling each coil and a corresponding load to form a test loop with the mutual inductor tester; the test loop of the first coil is closed through the switching controller, and then the output voltage is boosted to obtain test parameters; after the test of the first coil is completed, the first test loop is disconnected; a second test loop of the second coil is closed through the switching controller, and then the output voltage is boosted to obtain test parameters; after the test of the second coil is completed, the second test loop is disconnected; and so on. According to the rapid test method of the multi-coil CVT, all lines required by the test can be connected at one time, and the test lines are prevented from being repeatedly disassembled and assembled during the test; in the testing process, load switching does not need to be disconnected and reconnected, direct switching is achieved, voltage reduction is not needed, manual approaching to the tested CVT is not needed, remote operation can be achieved, and safety and high efficiency are achieved.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a rapid testing method for multi-coil CVTs. Background Technology

[0002] Capacitive voltage transformers (CVTs) typically have 3 or 4 sets of coils on the secondary output, depending on customer requirements, providing different output voltages and load capacities. Each set of outputs can offer different accuracy levels, depending on the requirements. During factory testing of the transformers, each set of coils needs to be tested for accuracy separately because they cannot be tested simultaneously. Since the testing process requires applying high voltage, the high voltage must be disconnected and manually operated to change the load and then reconnected each time a new load is tested. Therefore, each time the test power supply needs to be disconnected and the wiring and load box replaced, which is time-consuming and inefficient. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a rapid testing method for multi-coil CVTs, which solves the problem that existing multi-coil transformers require separate accuracy testing of each group of coils during factory testing. Because the testing cannot be performed simultaneously, each group needs to be tested separately, and the test power supply needs to be cut off and the wiring and matching load box need to be replaced each time, which is time-consuming and inefficient.

[0004] To address the aforementioned technical problems, this invention provides a rapid testing method for multi-coil CVTs, comprising: S1. Provide transformer TT, voltage regulator T, standard voltage transformer PT, transformer tester Pn, switching controller, and multiple loads. After connecting transformer TT, voltage regulator T, standard voltage transformer PT, and transformer tester, connect multiple loads to the switching controller. S2. Provide the CVT under test, wherein the CVT under test has at least 2 coils, and connect each coil to the corresponding load circuit; S3. Connect the switching controller to the current transformer tester so that each coil and its corresponding load form a test circuit with the current transformer tester. S4. Close the test circuit of the first coil by switching the controller, and then increase the output voltage to obtain the test parameters; S5. After the first coil test is completed, disconnect the first test circuit; S6. Close the second test circuit of the second coil by switching the controller, and then increase the output voltage to obtain the test parameters; S7. After the second coil test is completed, disconnect the second test circuit; S8. Continue in this manner until all coils have been tested. Then disconnect the switching controller from the transformer tester, remove the CVT under test, and complete the test.

[0005] Each coil of the CVT under test is connected to the transformer tester Pn and the standard voltage transformer PT. Each coil has an independent test circuit, and the on / off state of the test circuit is controlled by relay contact switches K1-K4.

[0006] Each load R1-R4 is connected to the switching controller to form multiple load circuits. Each load R1-R4 in the load circuit is connected in series with contactors KM1-KM4 and then connected in parallel with multiple pairs of relay contact switches K1-K4 in the measurement circuit to form parallel load circuits. The current transformer tester Pn of the multiple pairs of relay contact switches K1-K4 and contactor switch KM5 is connected to the current transformer under test Cv. The current transformer tester and the current transformer under test are respectively connected to multiple pairs of relay contact switches K1-K4 and controlled to open and close through contactor switch KM5.

[0007] The switching controller is used to control multiple pairs of relay contact switches K1-K4 and contactor switches KM1-KM5.

[0008] The switching controller includes a main control circuit controlled by the main control switch K, a first control branch of relay contact switches K1-K4 controlled by push-button controllers SB3-SB6, a second control branch of contactors KM1-KM4 controlled by push-button controllers SB7-SB10, and a third control branch of contactor KM5 controlled by push-button controllers SB11-SB12; contactors KM1-KM5 control contactor switches KM1-KM5.

[0009] The first control branch, the second control branch, and the third control branch are connected in parallel in the control loop.

[0010] The main control circuit includes relay K controlled by push-button controllers SB1-SB2, wherein push-button controllers SB1, SB2 and relay K are connected in series.

[0011] In the first control branch, the push-button controllers SB3-SB6 adopt a series structure in an open state, and the relays K1-K4 that they control are connected in parallel.

[0012] A standard current transformer tester can be used for the current transformer tester Pn.

[0013] The rapid testing method for multi-coil CVTs provided by this invention allows all necessary test wiring to be connected at once, avoiding repeated disassembly and reassembly of test leads during testing; wiring switching can be performed in the laboratory without power outages, reducing impact on the product; multiple loads can be pre-connected, eliminating the need for adjustments when testing different product models; the structure is simple to operate and easy to maintain; during testing, load switching does not require disconnecting and reconnecting the load, but can be done directly without voltage reduction or manual approach to the CVT under test, enabling remote operation that is safe and highly efficient. Attached Figure Description

[0014] Figure 1 This is a circuit diagram of the switching controller according to an embodiment of the present invention.

[0015] Figure 2 This is a test circuit diagram according to an embodiment of the present invention. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Example See Figure 1-2 This invention provides a rapid testing method for multi-coil CVTs, including: S1. Provide transformer TT, voltage regulator T, standard voltage transformer PT, transformer tester Pn, switching controller, and multiple loads. After connecting transformer TT, voltage regulator T, standard voltage transformer PT, and transformer tester, connect multiple loads to the switching controller. S2. Provide the CVT under test, wherein the CVT under test has at least 2 coils, and connect each coil to the corresponding load circuit; S3. Connect the switching controller to the current transformer tester so that each coil and its corresponding load form a test circuit with the current transformer tester. S4. Close the test circuit of the first coil by switching the controller, and then increase the output voltage to obtain the test parameters; S5. After the first coil test is completed, disconnect the first test circuit; S6. Close the second test circuit of the second coil by switching the controller, and then increase the output voltage to obtain the test parameters; S7. After the second coil test is completed, disconnect the second test circuit; S8. Continue in this manner, especially when the CVT under test contains a third coil, directly switch to the third coil through the switching controller; until all coils have been tested, disconnect the switching controller from the transformer tester, then remove the CVT under test to complete the test.

[0020] Each coil of the CVT under test is connected to the transformer tester Pn and the standard voltage transformer PT. Each coil has an independent test circuit, and the on / off state of the test circuit is controlled by relay contact switches K1-K4.

[0021] Each load R1-R4 is connected to the switching controller to form multiple load circuits. Each load R1-R4 in the load circuit is connected in series with contactors KM1-KM4, and then connected in parallel with multiple pairs of relay contact switches K1-K4 in the measurement circuit to form parallel load circuits. The current transformer tester Pn is connected to the current transformer under test (Cv) via multiple pairs of relay contact switches K1-K4 and contactor switch KM5. The current transformer tester and the current transformer under test are connected to multiple pairs of relay contact switches K1-K4, and the on / off state is controlled by contactor switch KM5. The number of loads can exceed the number of coils of the CVT under test, allowing selective connection of loads for different CVT specifications to complete the testing of different CVT specifications.

[0022] The switching controller is used to control multiple pairs of relay contact switches K1-K4 and contactor switches KM1-KM5.

[0023] The switching controller includes a main control circuit controlled by the main control switch K, a first control branch of relay contact switches K1-K4 controlled by push-button controllers SB3-SB6, a second control branch of contactors KM1-KM4 controlled by push-button controllers SB7-SB10, and a third control branch of contactor KM5 controlled by push-button controllers SB11-SB12; contactors KM1-KM5 control contactor switches KM1-KM5.

[0024] The first control branch, the second control branch, and the third control branch are connected in parallel in the control loop.

[0025] The main control circuit includes relay K controlled by push-button controllers SB1-SB2, wherein push-button controllers SB1, SB2 and relay K are connected in series.

[0026] In the first control branch, the push-button controllers SB3-SB6 adopt a series structure in an open state, and the relays K1-K4 that they control are connected in parallel.

[0027] A standard current transformer tester can be used for the current transformer tester Pn.

[0028] The rapid testing method for multi-coil CVTs provided by this invention allows all necessary test wiring to be connected at once, avoiding repeated disassembly and reassembly of test leads during testing; wiring switching can be performed in the laboratory without power outages, reducing impact on the product; multiple loads can be pre-connected, eliminating the need for adjustments when testing different product models; the structure is simple to operate and easy to maintain; during testing, load switching does not require disconnecting and reconnecting the load, but can be done directly without voltage reduction or manual approach to the CVT under test, enabling remote operation that is safe and highly efficient.

[0029] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method of rapid testing of a multi-coil CVT, characterized in that, It comprises: S1, providing a transformer TT, a voltage regulator T, a standard voltage transformer PT, a transformer tester Pn, a switching controller, and a plurality of loads, connecting the transformer TT, the voltage regulator T, the standard voltage transformer PT, and the transformer tester, and then connecting the plurality of loads to the switching controller; S2, providing a measured CVT, wherein the measured CVT has at least two coils, and connecting each coil to a corresponding load circuit; S3, connecting the switching controller to the transformer tester, so that each coil and the corresponding load form a test circuit with the transformer tester; S4, closing the test circuit of the first coil through the switching controller, and then increasing the output voltage to obtain test parameters; S5, after the first coil test is completed, disconnecting the first test circuit; S6, closing the second test circuit of the second coil through the switching controller, and then increasing the output voltage to obtain test parameters; S7, after the second coil test is completed, disconnecting the second test circuit; S8, and so on, until the test of all coils is completed, disconnecting the switching controller and the transformer tester, and then dismounting the measured CVT to complete the test.

2. The rapid test method according to claim 1, wherein each coil of the measured CVT is connected to the transformer tester Pn and the standard voltage transformer PT, each coil has an independent test circuit, and the test circuit is controlled by a relay control relay contact switch K1-K4.

3. The rapid test method according to claim 2, wherein each load R1-R4 is connected to the switching controller to form a plurality of load circuits, each load R1-R4 of the load circuit is connected in series with a contactor KM1-KM4 and then connected to a plurality of pairs of relay contact switches K1-K4 of the measurement circuit to form a parallel load circuit, a plurality of pairs of relay contact switches K1-K4 and a contactor switch KM5, wherein the transformer tester Pn is connected to the measured transformer Cv, the transformer tester and the measured transformer are connected to a plurality of pairs of relay contact switches K1-K4, and the connection is controlled by the contactor switch KM5.

4. The rapid test method according to claim 3, wherein the switching controller is used to control a plurality of pairs of relay contact switches K1-K4 and a contactor switch KM1-KM5.

5. The rapid test method according to claim 4, wherein the switching controller comprises a main control circuit controlled by a main control switch K, a first control branch of the relay contact switch K1-K4 controlled by a button controller SB3-SB6, a second control branch of the contactor KM1-KM4 controlled by a button controller SB7-SB10, and a third control branch of the contactor KM5 controlled by a button controller SB11-SB12; and the contactor KM1-KM5 controls the contactor switch KM1-KM5.

6. The rapid test method according to claim 5, wherein the first control branch, the second control branch, and the third control branch are connected in parallel in the control circuit. ​ ​ ​ ​ ​ 7. The rapid test method according to claim 6, characterized in that, The main control circuit comprises a relay K controlled by a button controller SB1-SB2, wherein the button controller SB1, the button controller SB2 and the relay K are connected in series.

8. The rapid test method according to claim 5, characterized in that, The button controllers SB3-SB6 in the first control branch are connected in series in an open state, and the corresponding controlled relays K1-K4 are connected in parallel.

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