CN211603357U - Three-phase test load - Google Patents
Three-phase test load Download PDFInfo
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- CN211603357U CN211603357U CN201922122061.6U CN201922122061U CN211603357U CN 211603357 U CN211603357 U CN 211603357U CN 201922122061 U CN201922122061 U CN 201922122061U CN 211603357 U CN211603357 U CN 211603357U
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Abstract
The utility model relates to a low-cost three-phase test load, it can compatible three-phase balance test function and three-phase unbalance test function, including three-phase load, gating unit and single-phase load, three-phase load has the A phase line, the B phase line, the C phase line, N phase line and three-phase balance test branch road, three lines that three-phase balance test branch road contains from the N phase line strides respectively to the A phase line, the B phase line, the C phase line, these three lines are respectively behind three switches of three-phase contactor KM1, do not establish ties resistance R1A that the resistance is the same again, resistance R1B, resistance R1C; the single-phase load is provided with a U-phase line and a single-phase test branch bridged between the U-phase line and the N-phase line, and the single-phase test branch is sequentially connected with a contactor KM22 and a resistor R22 in series; the gating unit is provided with a contactor KMA, a contactor KMB and a contactor KMC, wherein phase lines A, B and C are connected to the phase line U through the contactor KMA, the contactor KMB and the contactor KMC respectively.
Description
Technical Field
The utility model relates to a three-phase test load.
Background
The existing three-phase test load is divided into a three-phase balance test load and a three-phase unbalance test load, a user implements the three-phase balance test to connect the three-phase balance test load to the output end of the generator, and implements the three-phase unbalance test to connect the three-phase unbalance test load to the output end of the generator.
Disclosure of Invention
The utility model aims at providing a low-cost three-phase test load, it can compatible balanced test function of three-phase and unbalanced three-phase test function.
According to this, a three-phase test load is provided, comprising a three-phase load, a gating unit and a single-phase load,
the three-phase load is provided with an A-phase line, a B-phase line, a C-phase line, an N-phase line and a three-phase balance test branch, the three-phase balance test branch comprises three lines respectively connected with the A-phase line, the B-phase line and the C-phase line in a cross mode from the N-phase line, and the three lines are respectively connected with three switches of a three-phase contactor KM1 in series and then respectively connected with a resistor R1A, a resistor R1B and a resistor R1C which are the same in;
the single-phase load is provided with a U-phase line and a single-phase test branch bridged between the U-phase line and the N-phase line, and the single-phase test branch is sequentially connected with a contactor KM22 and a resistor R22 in series;
the gating unit is provided with a contactor KMA, a contactor KMB and a contactor KMC, wherein phase lines A, B and C are connected to the phase line U through the contactor KMA, the contactor KMB and the contactor KMC respectively.
Furthermore, the single-phase test branches in the single-phase load are multiple, and the resistance values of the single-phase test branches are different from each other.
Furthermore, the three-phase balance test branch in the three-phase load is provided with a plurality of branches, and the resistance values of the three-phase balance test branches are different from each other.
Further, fuse FU is connected in series in the three-phase balance test branch circuit and/or the single-phase test branch circuit.
Further, the contactor KMA, the contactor KMB and the contactor KMC are interlocked with each other two by two.
Furthermore, the three-phase contactor also comprises a three-phase contactor H, wherein the phase line A, the phase line B and the phase line C are respectively connected with three switches of the three-phase contactor in series.
Furthermore, the device also comprises a controller which is respectively connected with the controlled ends of the contactors.
Furthermore, the device also comprises three voltage sensors BV electrically connected with the controller, wherein one ends of the three voltage sensors BV are connected with the N phase lines together, and the other ends of the three voltage sensors BV are respectively connected with the A phase line, the B phase line and the C phase line.
Furthermore, the three current transformers BA are used for the currents on the phase line A, the phase line B and the phase line C, and the three current transformers BA are respectively and electrically connected with the controller.
Has the advantages that:
the utility model discloses a three-phase test load passes through the control of gating unit, can have three-phase balance test function and unbalanced three-phase test function concurrently, has the versatility, and only needs to set up a single-phase load and can accomplish the alternative loading to the three-phase, realizes that the circuit simplifies, reaches cost reduction's purpose.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
Fig. 1 is a schematic circuit diagram of a three-phase load and gating unit according to the present invention.
Fig. 2 is a schematic circuit diagram of a single-phase load according to the present invention.
Detailed Description
The three-phase test load of the present embodiment is composed of the three-phase load shown in fig. 1, the gating unit, and the single-phase load shown in fig. 2.
Referring to fig. 1, the three-phase load includes an a-phase line, a B-phase line, a C-phase line, an N-phase line and a plurality of three-phase balance test branches, the circuit structures of the three-phase balance test branches are the same, only a 5KW-1 three-phase balance test branch is used for illustration here, the 5KW-1 three-phase balance test branch includes three lines respectively connected to the a-phase line, the B-phase line and the C-phase line from the N-phase line, and the three lines are respectively connected in series with three switches of a three-phase contactor KM1, and then respectively connected in series with a resistor R1A, a resistor R1B and a resistor R.
In the three-phase load, the resistance values of all three-phase balance testing branches are different from each other.
In order to ensure the safety of each line, each line in the three-phase balance test branch 5KW-1 is connected with a fuse FU in series for overvoltage protection.
The gating unit comprises contactor KMA, contactor KMB, contactor KMC, and A phase line, B phase line, C phase line are connected to the U phase line through contactor KMA, contactor KMB, contactor KMC respectively, and wherein contactor KMA, KMB, KMC realize two liang of interlocks each other through electric switch, guarantee that one of them can only close a floodgate at the same moment.
The single-phase load shown in fig. 2 is bridged between the U-phase line and the N-phase line, the single-phase load comprises a plurality of single-phase testing branches, the circuit structures of the single-phase testing branches are the same, only the single-phase testing branch 1KW is used for example here, two ends of the single-phase testing branch 1KW are respectively bridged between the U-phase line and the N-phase line, and a fuse FU, a contactor KM22 and a resistor R22 are sequentially connected in series on the branches.
In the single-phase load, the resistance values of the single-phase test branches are different from each other.
(1) When the contactor KMA, the contactor KMB and the contactor KMC are all disconnected, a circuit performs a three-phase balance test, one or more branches in three-phase balance test branches can be conducted at the moment, and the resistors synchronously loaded on the phase line A, the phase line B and the phase line C are changed;
(2) when one of the contactor KMA, the contactor KMB and the contactor KMC is conducted, the circuit conducts an unbalance test, at the moment, the corresponding contactor is switched on when the unbalance test is needed to be conducted on any phase of A, B, C three phases, after the contactor is switched on, a single-phase load is added into one phase needing to be tested, one or more branches of single-phase testing branches can be conducted, and the resistance loaded on the phase line is changed.
The three-phase test load of this embodiment passes through the control of gating unit, can have three-phase balance test function and three-phase unbalance test function concurrently, has the versatility, and only needs to set up a single-phase load and can accomplish the alternative loading to the three-phase, realizes that the circuit simplifies, reaches cost reduction's purpose.
The resistor needs to be provided with 1.5 times of allowance in design, namely when the rated voltage is @400V/50Hz and the rated power is three-phase 1500 KW/single-phase 450KW, the resistor can meet the use requirements of the use voltage of @480V/50Hz and the power of three-phase 2160 KW/single-phase 648 KW.
Referring to fig. 1, three switches of a three-phase contactor H are respectively connected in series on the phase line a, the phase line B, and the phase line C to realize total current on-off control.
Further, a controller not shown in the figure is provided to connect the controlled ends of the contactors respectively, so that the circuit control mode is electrically controlled, and of course, a manual switch may be provided to connect the controlled ends of the contactors to realize manual control.
The three-phase voltage acquisition device is characterized in that three voltage sensors BV electrically connected with the controller are arranged, one ends of the three voltage sensors BV are connected with the N phase line, and the other ends of the three voltage sensors BV are connected with the A phase line, the B phase line and the C phase line respectively, so that voltage parameters of all the lines on the A phase line, the B phase line and the C phase line are collected and monitored by the controller.
And three current transformers BA electrically connected with the controller are arranged, the three current transformers BA are used for current on the phase line A, the phase line B and the phase line C, and the current is transmitted to the controller for monitoring.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A three-phase test load, characterized by:
comprises a three-phase load, a gating unit and a single-phase load,
the three-phase load is provided with an A-phase line, a B-phase line, a C-phase line, an N-phase line and a three-phase balance test branch, the three-phase balance test branch comprises three lines respectively connected with the A-phase line, the B-phase line and the C-phase line in a cross mode from the N-phase line, and the three lines are respectively connected with three switches of a three-phase contactor KM1 in series and then respectively connected with a resistor R1A, a resistor R1B and a resistor R1C which are the same in;
the single-phase load is provided with a U-phase line and a single-phase test branch bridged between the U-phase line and the N-phase line, and the single-phase test branch is sequentially connected with a contactor KM22 and a resistor R22 in series;
the gating unit is provided with a contactor KMA, a contactor KMB and a contactor KMC, wherein phase lines A, B and C are connected to the phase line U through the contactor KMA, the contactor KMB and the contactor KMC respectively.
2. A three-phase test load according to claim 1, wherein: the single-phase test branch road in the single-phase load has many, and the resistance value of each single-phase test branch road is different each other.
3. A three-phase test load according to claim 1 or 2, wherein: the three-phase balance test branch circuit in the three-phase load has a plurality of, and the resistance values of each three-phase balance test branch circuit are different from each other.
4. A three-phase test load according to claim 1, wherein: fuse FU is connected in series in the three-phase balance test branch circuit and/or the single-phase test branch circuit.
5. A three-phase test load according to claim 1, wherein: the contactor KMA, the contactor KMB and the contactor KMC are mutually interlocked in pairs.
6. A three-phase test load according to claim 1, wherein: the three-phase contactor is characterized by further comprising a three-phase contactor H, wherein the phase line A, the phase line B and the phase line C are respectively connected with three switches of the three-phase contactor in series.
7. A three-phase test load according to claim 1, wherein: the contactor control device further comprises a controller, and the controller is respectively connected with the controlled ends of the contactors.
8. A three-phase test load according to claim 7, wherein: the intelligent control system is characterized by further comprising three voltage sensors BV electrically connected with the controller, wherein one ends of the three voltage sensors BV are connected with the N phase lines together, and the other ends of the three voltage sensors BV are connected with the A phase line, the B phase line and the C phase line respectively.
9. A three-phase test load according to claim 7 or 8, wherein: the three current transformers BA are used for supplying current to the phase line A, the phase line B and the phase line C, and are respectively and electrically connected with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922122061.6U CN211603357U (en) | 2019-11-29 | 2019-11-29 | Three-phase test load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922122061.6U CN211603357U (en) | 2019-11-29 | 2019-11-29 | Three-phase test load |
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| CN211603357U true CN211603357U (en) | 2020-09-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740768A (en) * | 2021-07-22 | 2021-12-03 | 南方电网深圳数字电网研究院有限公司 | Zero line fault detection device, method, electronic equipment and storage medium |
| CN114910821A (en) * | 2021-02-07 | 2022-08-16 | 中通服节能技术服务有限公司 | AC virtual load tester for power distribution product |
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2019
- 2019-11-29 CN CN201922122061.6U patent/CN211603357U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114910821A (en) * | 2021-02-07 | 2022-08-16 | 中通服节能技术服务有限公司 | AC virtual load tester for power distribution product |
| CN113740768A (en) * | 2021-07-22 | 2021-12-03 | 南方电网深圳数字电网研究院有限公司 | Zero line fault detection device, method, electronic equipment and storage medium |
| CN113740768B (en) * | 2021-07-22 | 2024-05-14 | 南方电网数字平台科技(广东)有限公司 | Zero line fault detection device and method, electronic equipment and storage medium |
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