Harmonic current test circuit

Abstract

The utility model relates to the technical field of harmonic current testing, in particular to a harmonic current testing circuit, which comprises a power supply, an output interface, a first current detector, a first active filter and a reactor. The harmonic current test circuit further comprises a first switch, a second switch, a third switch and a fourth switch. The first current detector comprises a first current input end, a first current output end and a first current detection output end; the first active filter comprises a first filtering input end and a first current detection input end; the power supply comprises a live wire end and a zero wire end; the zero line end is connected with the output interface through the first switch. According to the utility model, the reactor, the first current detector and the first active filter are integrated, and different harmonic treatment can be realized by controlling the on and off of different switches, so that the harmonic current of the to-be-detected unit can be simply and conveniently found, and the device is efficient, safe and free of potential safety hazards.

Description

Technical Field

[0001] The utility model relates to the technical field of harmonic current testing, and particularly relates to a circuit for harmonic current testing. Background Art

[0002] At present, the demand for harmonic current governance of units in data centers is becoming increasingly prominent. It is temporarily impossible to calculate through actual data whether it can definitely meet the requirements, and a large number of basic experiments are needed to support the data. While the whole machine is tested, on-site rectification is also carried out. At present, most in the data center industry adopt a piecing-together method, that is, by continuously increasing materials such as active power filters, reactors, and filters and manually combining them multiple times to obtain the desired effect.

[0003] The above testing method has low testing efficiency and requires a large amount of time for preliminary testing and on-site rectification; moreover, the scheme is complex and prone to errors, and it is necessary to transform the wire group on-site, and there are certain safety hazards in wiring; in addition, professional technical personnel are required for testing, wasting labor costs. Content of the Utility Model

[0004] The purpose of the utility model is to provide a circuit for harmonic current testing in view of the above deficiencies in the prior art.

[0005] The purpose of the utility model is achieved through the following technical solutions: A circuit for harmonic current testing includes a power supply, an output interface, a first current detector, a first active filter, and a reactor;

[0006] The circuit for harmonic current testing further includes a first switch, a second switch, a third switch, and a fourth switch;

[0007] The first current detector includes a first current input end, a first current output end, and a first current detection output end; the first active filter includes a first filter input end and a first current detection input end; the power supply includes a live wire end and a neutral wire end;

[0008] The neutral wire end is connected to the output interface through the first switch;

[0009] The live wire end is connected to the first current input end through the first switch; the first current output end is connected to the output interface through the second switch; the first current output end is connected to the output interface through the third switch and the reactor; the first current detection output end is connected to the first current detection input end; the first filter input end is connected to the live wire end through the fourth switch and the first switch in sequence.

[0010] The utility model is further arranged such that the circuit for harmonic current testing further includes a second current detector, a second active filter, and a fifth switch;

[0011] The second current detector includes a second current input terminal, a second current output terminal and a second current detection output terminal; the second active filter includes a second filter input terminal and a second current detection input terminal;

[0012] The second current input terminal is connected to the first current input terminal; the second current output terminal is connected to the first current output terminal; the second current detection output terminal is connected to the second current detection input terminal; and the second filter input terminal is connected to the live wire terminal through the fifth switch and the first switch in sequence.

[0013] The present invention is further configured such that the first switch, the second switch, the third switch, the fourth switch and the fifth switch are all air switches.

[0014] The present invention is further configured such that the first current detector is provided with a first current transformer between the first current input end and the first current output end.

[0015] The present invention is further configured such that the second current detector is provided with a second current transformer between the second current input terminal and the second current output terminal.

[0016] The present invention is further configured such that the circuit for harmonic current testing further includes a connector; and the output interface is provided on the connector.

[0017] The present invention is further configured such that the first active filter is integrated with a first detector; the first detector is connected to the first current detection input terminal.

[0018] The present invention is further configured such that the second active filter is integrated with a second detector; and the second detector is connected to the second current detection input terminal.

[0019] The beneficial effects of the utility model are as follows: the utility model integrates the reactor, the first current detector and the first active filter, and can achieve different harmonic control by controlling the closing and opening of different switches, so that the harmonic current of the unit to be tested can be simply and conveniently determined, which is efficient and safe, and does not pose a safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without making any creative effort.

[0021] Figure 1 It is a circuit principle diagram of the utility model;

[0022] Wherein: 1. Power supply; 11. Live wire terminal; 12. Neutral wire terminal; 2. Output interface; 3. First current detector; 31. First current input terminal; 32. First current output terminal; 33. First current detection output terminal; 4. Second current detector; 41. Second current input terminal; 42. Second current output terminal; 43. Second current detection output terminal; 5. First active filter; 51. First filter input terminal; 52. First current detection input terminal; 6. Second active filter; 61. Second filter input terminal; 62. Second current detection input terminal; 7. Reactor; 81. First switch; 82. Second switch; 83. Third switch; 84. Fourth switch; 85. Fifth switch. Detailed implementation mode

[0023] The present utility model will be further described in conjunction with the following embodiments.

[0024] As Figure 1 it can be known, a circuit for harmonic current test described in this embodiment includes a power supply 1, an output interface 2, a first current detector 3, a first active filter 5 and a reactor 7;

[0025] The circuit for harmonic current test further includes a first switch 81, a second switch 82, a third switch 83 and a fourth switch 84;

[0026] The first current detector 3 includes a first current input terminal 31, a first current output terminal 32 and a first current detection output terminal 33; the first active filter 5 includes a first filter input terminal 51 and a first current detection input terminal 52; the power supply 1 includes a live wire terminal 11 and a neutral wire terminal 12;

[0027] The neutral wire terminal 12 is connected to the output interface 2 through the first switch 81;

[0028] The live wire terminal 11 is connected to the first current input terminal 31 through the first switch 81; the first current output terminal 32 is connected to the output interface 2 through the second switch 82; the first current output terminal 32 is connected to the output interface 2 through the third switch 83 and the reactor 7; the first current detection output terminal 33 is connected to the first current detection input terminal 52; the first filter input terminal 51 is connected to the live wire terminal 11 through the fourth switch 84 and the first switch 81 in sequence.

[0029] Among them, the reactor 7 can improve harmonics by improving the power factor, and the first active filter 5 can analyze the reactive current and harmonic current content in the load current, emit specific pulses to generate the required harmonic compensation current, and finally realize the dynamic and accurate compensation of harmonic current.

[0030] Specifically, for the circuit of harmonic current test in this embodiment, first connect the output interface 2 to the unit under test, and then close the first switch 81.

[0031] When the second switch 82 is closed, and the third switch 83 and the fourth switch 84 are open, at this time the unit is equivalent to not performing any harmonic control. Test the harmonic current of the unit at this time and record the relevant data.

[0032] When the third switch 83 is closed, and the second switch 82 and the fourth switch 84 are open, at this time the unit is equivalent to performing harmonic control with the series reactor 7. Test the harmonic current of the unit at this time and record the relevant data.

[0033] When the second switch 82 and the fourth switch 84 are closed, and the third switch 83 is open, at this time the unit is equivalent to performing harmonic control with the first active filter 5. Test the harmonic current of the unit at this time and record the relevant data.

[0034] When the third switch 83 and the fourth switch 84 are closed, and the second switch 82 is open, at this time the unit is equivalent to performing harmonic control with the first active filter 5 and the reactor 7. Test the harmonic current of the unit at this time and record the relevant data.

[0035] In this embodiment, by integrating the reactor 7, the first current detector 3 and the first active filter 5, and controlling the closing and opening of different switches, different harmonic controls can be realized, so that the harmonic current of the unit under test can be simply and conveniently detected, efficiently and safely, without any potential safety hazards.

[0036] For the circuit of harmonic current test in this embodiment, the circuit of harmonic current test further includes a second current detector 4, a second active filter 6 and a fifth switch 85.

[0037] The second current detector 4 includes a second current input terminal 41, a second current output terminal 42 and a second current detection output terminal 43; the second active filter 6 includes a second filter input terminal 61 and a second current detection input terminal 62.

[0038] The second current input terminal 41 is connected to the first current input terminal 31; the second current output terminal 42 is connected to the first current output terminal 32; the second current detection output terminal 43 is connected to the second current detection input terminal 62; the second filter input terminal 61 is connected to the live wire terminal 11 through the fifth switch 85 and the first switch 81 in sequence.

[0039] Specifically, in this embodiment, a second current detector 4, a second active filter 6, and a fifth switch 85 are provided. When the second switch 82, the fourth switch 84, and the fifth switch 85 are closed and the third switch 83 is open, the unit is equivalent to the first active filter 5 and the second active filter 6 for harmonic suppression. At this time, the harmonic current of the unit is tested and relevant data is recorded.

[0040] When the third switch 83, the fourth switch 84, and the fifth switch 85 are closed and the second switch 82 is open, the unit is equivalent to the first active filter 5, the second active filter 6, and the reactor 7 for harmonic suppression. At this time, the harmonic current of the unit is tested and relevant data is recorded.

[0041] Through the above settings, the adaptability of harmonic current testing can be effectively broadened, and further, a new set of current detectors, active filters, and switches can be added in parallel for harmonic suppression expansion.

[0042] In the circuit for harmonic current testing according to this embodiment, the first switch 81, the second switch 82, the third switch 83, the fourth switch 84, and the fifth switch 85 are all air switches. Specifically, through the above settings, the on / off of relevant branches can be effectively controlled, making the overall structure stable and reliable.

[0043] In the circuit for harmonic current testing according to this embodiment, the first current detector 3 is provided with a first current transformer between the first current input end 31 and the first current output end 32. Through the above settings, the functions of safety isolation and accurate current measurement can be achieved.

[0044] In the circuit for harmonic current testing according to this embodiment, the second current detector 4 is provided with a second current transformer between the second current input end 41 and the second current output end 42. Through the above settings, the functions of safety isolation and accurate current measurement can be achieved.

[0045] In the circuit for harmonic current testing according to this embodiment, the circuit for harmonic current testing further includes a connector; the output interface 2 is provided on the connector. Through the above settings, it is convenient to connect to the unit under test.

[0046] In the circuit for harmonic current testing according to this embodiment, the first active filter 5 is integrated with a first detector; the first detector is connected to the first current detection input end 52. Through the above settings, it is convenient to observe the current magnitude of relevant branches.

[0047] In the circuit for harmonic current testing according to this embodiment, the second active filter 6 is integrated with a second detector; the second detector is connected to the second current detection input end 62. Through the above settings, it is convenient to observe the current magnitude of relevant branches.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A circuit for harmonic current testing, characterized in that: It includes a power supply (1), an output interface (2), a first current detector (3), a first active filter (5), and a reactor (7); The circuit for harmonic current testing further includes a first switch (81), a second switch (82), a third switch (83), and a fourth switch (84); The first current detector (3) includes a first current input terminal (31), a first current output terminal (32), and a first current detection output terminal (33); the first active filter (5) includes a first filter input terminal (51) and a first current detection input terminal (52); the power supply (1) includes a live wire terminal (11) and a neutral wire terminal (12); The neutral wire terminal (12) is connected to the output interface (2) through the first switch (81); The live wire terminal (11) is connected to the first current input terminal (31) through the first switch (81); the first current output terminal (32) is connected to the output interface (2) through the second switch (82); the first current output terminal (32) is connected to the output interface (2) through the third switch (83) and the reactor (7); the first current detection output terminal (33) is connected to the first current detection input terminal (52); the first filter input terminal (51) is connected to the live wire terminal (11) after passing through the fourth switch (84) and the first switch (81) in sequence.

2. The circuit for harmonic current testing according to claim 1, wherein: The circuit for harmonic current testing further includes a second current detector (4), a second active filter (6), and a fifth switch (85); The second current detector (4) includes a second current input terminal (41), a second current output terminal (42), and a second current detection output terminal (43); the second active filter (6) includes a second filter input terminal (61) and a second current detection input terminal (62); The second current input terminal (41) is connected to the first current input terminal (31); the second current output terminal (42) is connected to the first current output terminal (32); the second current detection output terminal (43) is connected to the second current detection input terminal (62); the second filter input terminal (61) is connected to the live wire terminal (11) after passing through the fifth switch (85) and the first switch (81) in sequence.

3. The circuit for harmonic current test according to claim 2, characterized in that: The first switch (81), the second switch (82), the third switch (83), the fourth switch (84), and the fifth switch (85) are all air switches.

4. The circuit for harmonic current testing according to claim 1, wherein: The first current detector (3) is provided with a first current transformer between the first current input terminal (31) and the first current output terminal (32).

5. The circuit for harmonic current test according to claim 2, wherein: The second current detector (4) is provided with a second current transformer between the second current input terminal (41) and the second current output terminal (42).

6. The circuit for harmonic current test according to claim 1, characterized in that: The circuit for harmonic current testing further includes a connector; the output interface (2) is provided on the connector.

7. The circuit for harmonic current testing according to claim 1, wherein: The first active filter (5) is integrated with a first detector; the first detector is connected to the first current detection input terminal (52).

8. A circuit for harmonic current testing according to claim 2, characterized in that: The second active filter (6) is integrated with a second detector; the second detector is connected to the second current detection input terminal (62).

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