CN216411395U - Motor starting current detection device - Google Patents
Motor starting current detection device Download PDFInfo
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- CN216411395U CN216411395U CN202122927431.0U CN202122927431U CN216411395U CN 216411395 U CN216411395 U CN 216411395U CN 202122927431 U CN202122927431 U CN 202122927431U CN 216411395 U CN216411395 U CN 216411395U
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Abstract
The application provides a motor starting current check out test set relates to the electromechanical field, solves the starting current of the unable accurate measurement motor at present to make and can't judge whether normal problem of motor start. The motor starting current detection equipment comprises a current derivation device, a current mutual inductance device and an ammeter; the current derivation device, the current mutual inductance device and the ammeter are connected in series in sequence. The application provides a motor starting current detection device for detecting a motor starting current.
Description
Technical Field
The application relates to the electromechanical field, especially relates to a motor starting current check out test set.
Background
At present, the current of a motor is generally monitored by an ammeter, and at the moment of starting the motor, the starting current may reach 6-8 times of the rated current of the motor and far exceeds the range of the ammeter, so that the starting current of the motor cannot be accurately measured, and whether the motor is normally started cannot be judged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a motor starting current detection device which can be used for solving the technical problem that whether the motor is started normally or not cannot be judged because the starting current of a motor cannot be accurately measured at present.
The embodiment of the utility model provides a motor starting current detection device, which comprises a current derivation device, a current mutual inductance device and an ammeter, wherein the current derivation device is connected with the current mutual inductance device;
the current derivation device, the current mutual inductance device and the ammeter are connected in series in sequence.
Optionally, in one embodiment, the current derivation device is a clamp current clamp.
Optionally, in an embodiment, a first current transformer is disposed in the pincer-shaped current clamp, and a secondary winding of the first current transformer is connected to the current transformer.
Optionally, in an embodiment, the current transformer device includes a second current transformer, the current output wire of the secondary winding of the first current transformer passes through the toroidal core of the second current transformer, and the secondary winding of the second current transformer is connected to the current meter.
Optionally, in an embodiment, the second current transformer is detachably connected to the first current transformer, and the second current transformer is detachably connected to the ammeter.
Optionally, in an embodiment, the secondary winding of the second current transformer includes a first interface and a second interface, and the ammeter includes a first interface and a second interface;
and a first interface of a secondary winding of the second current transformer is connected with a first interface of the ammeter, and a second interface of the secondary winding of the second current transformer is connected with a second interface of the ammeter.
Optionally, in an embodiment, the current transformer further includes a third current transformer, the current output wire of the secondary winding of the first current transformer passes through the toroidal core of the second current transformer, and the secondary winding of the second current transformer is connected to the current meter; or a current output wire of the secondary winding of the first current transformer penetrates through the annular iron core of the third current transformer, and the secondary winding of the third current transformer is connected with the ammeter.
Optionally, in an embodiment, the ammeter is a memory ammeter.
Optionally, in an embodiment, the ammeter includes a current display unit and a shift position conversion unit connected in parallel.
Optionally, in one embodiment, the gear shifting unit includes a single-pole multi-throw switch and a plurality of resistors, and the plurality of resistors are connected in parallel;
the single-pole multi-throw switch is provided with a first end and a plurality of second ends, the second ends correspond to the resistors one by one, and the second ends are respectively connected with one ends of the resistors;
the first end of the single-pole multi-throw switch is connected with a first interface of a secondary winding of the second current transformer, and the other ends of the resistors are respectively connected with a second interface of the secondary winding of the second current transformer.
The utility model has the following beneficial effects:
by adopting the motor starting current detection equipment provided by the embodiment of the application, the current detection equipment comprises a current derivation device, a current mutual inductance device and an ammeter, wherein the current derivation device, the current mutual inductance device and the ammeter are sequentially connected in series; the current mutual inductance device is additionally arranged between the current lead-out device and the ammeter to further reduce the induced current generated by the starting current of the induction motor of the current lead-out device, so that the induced current falls into the detection range of the ammeter, the phenomenon that the induced current exceeds the range of the ammeter when the motor is started is avoided, and the starting current of the motor can be measured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram of a motor starting current detection device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another motor starting current detection device provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another motor starting current detection apparatus provided in an embodiment of the present application.
Reference numerals:
10-motor starting current detection equipment; 101-current deriving means; 1011-a first current transformer; 102-current transformer means; 1021-a second current transformer; 103-an ammeter; 1031-current display unit; 1032 — gear shift position conversion unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As described in the background art, at present, the motor current is generally monitored by a current meter, and at the moment of starting the motor, the starting current may reach 6-8 times of the rated current of the motor, which is far beyond the range of the current meter, so that the starting current of the motor cannot be accurately measured. If the current value at the moment of starting cannot be detected, whether the motor is normally started cannot be correctly analyzed, and the fault reason of instantaneous tripping after the motor is started cannot be analyzed according to the current value when the motor is started.
Based on this, the embodiment of the present application provides a motor starting current detection device 10, which is used to solve the technical problem that the starting current of the motor cannot be accurately measured, so that whether the motor is started normally cannot be judged, and the fault reason of the motor during instantaneous trip after the motor is started cannot be analyzed according to the current magnitude during the motor starting. As shown in fig. 1, the motor-starting current detection apparatus 10 includes a current derivation device 101, a current mutual induction device 102, and an ammeter 103; the current derivation device 101, the current transformer 102, and the ammeter 103 are connected in series in this order.
The current derivation device 101 may be configured to induce a starting current of the motor, generate an induced current, and output the induced current. The current lead-out means 101 may specifically be a clamp-on current clamp, as shown in fig. 2.
The current transformer 102 may be used to convert a primary current with a larger value to a secondary current with a smaller value. The current transformer device 102 may be, for example, a current transformer.
The current derivation means 101 is connected to the current transformer 102, and the induced current output from the current derivation means 101 can be input to the current transformer 102 as the primary current of the current transformer 102. After the current conversion function of the current transformer 102, the magnitude of the secondary current output by the current transformer 102 can be within the detection range of the ammeter 103, i.e. within the range of the ammeter 103.
It can be understood that, with the motor starting current detection device 10 provided in the above embodiment of the present application, the detection device 10 includes a current derivation means 101, a current mutual inductance means 102 and an ammeter 103, where the current derivation means 101, the current mutual inductance means 102 and the ammeter 103 are connected in series in sequence; the current mutual inductance device 102 is additionally arranged between the current derivation device 101 and the ammeter 103, so that the induced current generated by the starting current of the induction motor of the current derivation device 101 is further reduced, the induced current is in the detection range of the ammeter 103, the phenomenon that the induced current exceeds the range of the ammeter when the motor is started can be avoided, and the starting current of the motor can be measured.
In the case where the current derivation means 101 is a current clamp, a first current transformer 1011 is provided in the current clamp, and as shown in fig. 2, a secondary winding of the first current transformer 1011 is connected to the current transformer 102, so that an induced current generated by the first current transformer 1011 inducing a starting current of the motor is transmitted to the current transformer 102. Wherein the current of the motor to be detected passes through the toroidal core of the first current transformer 1011 as the primary current of the first current transformer 1011, not shown in fig. 2.
In practical applications, the current transformer 102 may include a second current transformer 1021, as shown in fig. 2, the secondary winding of the first current transformer 1011 is connected to the current transformer 102, specifically, the output lead a of the secondary winding of the first current transformer 1011 passes through a toroidal core of the second current transformer 1021, and the secondary winding of the second current transformer 1021 is connected to the current meter 103; further, the induced current generated by the first current transformer 1011 can be used as the primary current of the second current transformer 1021, and the second current transformer 1021 can generate a smaller secondary current based on the primary current.
In order to further accurately detect the starting current of the motor to be detected, the CT transformation ratio of the second current transformer 1021 is matched with the starting current of the motor to be detected, wherein the CT transformation ratio is the ratio between the converted currents at the two sides of the current transformer, namely the ratio of the primary side current and the secondary side current; for example, from 5000A to 5A, the ratio is 5000/5. Structurally, that is, the number of turns of the secondary winding of the second current transformer 1021 is matched to the starting current of the motor to be detected. Generally, the larger the starting current of the motor to be detected, the more the number of turns of the secondary winding of the second current transformer 1021 may be, and the smaller the starting current of the motor to be detected, the less the number of turns of the secondary winding of the second current transformer 1021 may be.
Then, for motors to be detected with different starting currents, the starting currents of the motors to be detected may differ greatly, even by one order of magnitude, and if there are two motors to be detected, the starting current of one of the motors to be detected is 200A, and the starting current of the other motor to be detected is 2000A; the starting currents of these motors to be tested may not be detected by the same current transformer. For example, the second current transformer matching the starting current of 200A, whose CT transformation ratio does not match the starting current of 2000A, cannot reduce the induced current to a magnitude that can be detected by the ammeter 103. Therefore, in an implementation manner, in the motor-starting current detection apparatus 10 provided in the embodiment of the present application, the second current transformer 1021 is detachably connected to the first current transformer 1011, and the second current transformer 1021 is detachably connected to the current meter 103.
In practical application, the second current transformer 1021 and the first current transformer 1011 are detachably connected, the second current transformer 1021 and the ammeter 103 are detachably connected, and it may be that a secondary winding of the second current transformer 1021 includes a first interface and a second interface, and the ammeter 103 includes a first interface and a second interface; a first interface of the secondary winding of the second current transformer 1021 is connected with a first interface of the ammeter 103, and a second interface of the secondary winding of the second current transformer 1021 is connected with a second interface of the ammeter 103. The first interface of the second current transformer 1021 is connected or disconnected with the first interface of the ammeter 103, and the second interface of the second current transformer 1021 is connected or disconnected with the second interface of the ammeter 103, so that the second current transformer 1021 can be detached.
Further, when the second current transformer 1021 cannot detect the current starting current of the motor to be detected, the second current transformer can be detached and replaced by another current transformer. Therefore, in one embodiment, the current transformer apparatus 102 further comprises a third current transformer, the current output conductor a of the secondary winding of the first current transformer 1011 passes through the toroidal core of the second current transformer 1021, and the secondary winding of the second current transformer 1021 is connected to the current meter 103; or, a current output wire a of the secondary winding of the first current transformer 1011 passes through the annular iron core of the third current transformer, the secondary winding of the third current transformer is connected with the ammeter 103, which is not shown in the figure, and the connection mode of the third current transformer with the first current transformer 1011 and the ammeter 103 may refer to the second current transformer 1021.
It should be understood that, in addition to the second current transformer 1021 and the third current transformer, the current transformer 102 may include more current transformers, and the CT transformation ratio of each current transformer may be different, so that when detecting the starting current of the motor to be detected, a current transformer matched with the starting current of the motor to be detected may be selected in advance according to the starting current of the motor to be detected, and then the matched current transformer is installed between the first current transformer 1011 and the current meter 103. For example, the current transformer 102 may include a second current transformer 1021, a third current transformer, a fourth current transformer, a fifth current transformer, and a sixth current transformer, which have CT transformation ratios of 2000/5, 1500/5, 1000/5, 500/5, and 100/5; if the starting instantaneous maximum current of the motor to be detected is 1800A, a second current transformer 1021 is matched with the motor to be detected, and the CT transformation ratio of the motor to be detected is 2000/5; a second current transformer 1021 may be installed between the first current transformer 1011 and the current meter 103. Other current transformers included in the current transformer device 102 may also include a first interface and a second interface, and the first interface is connected or disconnected with the first interface of the ammeter 103, and the second interface is connected or disconnected with the second interface of the ammeter 103, so that the mounting and the dismounting may be achieved.
In practical application, the matched current transformer is selected according to the starting current of the motor to be detected, the starting current of the motor to be detected can be estimated according to the rated current of the motor to be detected, and then the current transformer with the matched CT transformation ratio is selected according to the estimated starting current. Since the starting current of the motor is generally 6-8 times of the rated current of the motor, the starting current of the motor to be detected can be preliminarily estimated according to the rated current of the motor to be detected. If the rated current of the motor to be detected cannot be obtained, the starting current can be estimated according to the capacity of the motor to be detected, and details are not repeated herein. After the starting current is estimated, a matched current transformer can be selected according to the estimated starting current. For example, the capacity of the motor to be detected is 150kW, the rated current is 220A, the starting current is estimated to be approximately 1300A to 1800A, and a current transformer with a transformation ratio of 2000/5 can be selected.
In order to obtain the maximum instantaneous current when the motor to be detected is started, so as to further accurately judge whether the motor is normally started, in an embodiment, the ammeter 103 is a memory ammeter, and may specifically be an accurate memory ammeter. Because the memory ammeter has a memory function, the maximum instantaneous current of the motor during starting can be better recorded, and the more accurate instantaneous maximum current of the motor during starting can be further obtained, so that whether the motor is normally started can be more accurately judged.
In one embodiment, the ammeter 103 includes a current display unit 1031 and a shift position conversion unit 1032 connected in parallel, as shown in fig. 3. In order to implement the memory function, the ammeter 103 further includes a component for implementing the memory function, such as a memory chip, and the connection relationship between the component and other parts in the ammeter 103 may be set correspondingly according to the difference of the component, which is not described herein again.
The current display unit 1021 can display the current of the motor to be detected, and the gear shift unit 1032 can select the range according to the starting current of the motor to be detected. Before the starting current of the motor to be detected is detected, a proper current transformer can be selected according to the starting current and installed between the first current transformer 1011 and the ammeter 103, a proper gear can be further selected and adjusted to a corresponding gear, and then the starting current of the motor to be detected is detected.
The gear conversion unit 1032 comprises a single-pole multi-throw switch K and a plurality of resistors which are connected in parallel; the single-pole multi-throw switch is provided with a first end and a plurality of second ends, the second ends correspond to the resistors one by one, and the second ends are respectively connected with one ends of the resistors; a first end of the single-pole multi-throw switch is connected to a first interface of a secondary winding of the second current transformer 1021, and the other ends of the plurality of resistors are respectively connected to a second interface of the secondary winding of the second current transformer 1021.
As shown in fig. 3, the gear shift position conversion unit 1032 may include five gear positions (five gear positions include five resistors connected in parallel) which may specifically include 2000A gear position, 1500A gear position, 1000A gear position, 500A gear position, and 100A gear position, corresponding to the second current transformer (CT transformation ratio is 2000/5), the third current transformer (CT transformation ratio is 1500/5), the fourth current transformer (CT transformation ratio is 1000/5), the fifth current transformer (CT transformation ratio is 500/5), and the sixth current transformer (CT transformation ratio is 100/5) in the above example; if the capacity of the motor to be detected is 150kW and the rated current is 220A, the starting current of the motor to be detected is estimated to be approximately 1300-1800A, a current transformer with the transformation ratio of 2000/5 can be selected at the moment, and the single-pole multi-throw switch K is selected at the 2000A gear, so that the more accurate instantaneous starting maximum current of the motor can be obtained, and whether the motor is normally started or not can be judged more accurately.
In summary, with the motor starting current detection device 10 provided in the above embodiment of the present application, the detection device 10 includes a current derivation device 101, a current transformer 102, and an ammeter 103, where the current derivation device 101, the current transformer 102, and the ammeter 103 are connected in series in sequence; according to the technical scheme provided by the embodiment of the application, the current mutual induction device 102 is additionally arranged between the current derivation device 101 and the ammeter 103, so that the induced current generated by the starting current of the induction motor of the current derivation device 101 is further reduced, the induced current is made to fall into the detection range of the ammeter 103, the phenomenon that the induced current exceeds the range of the ammeter when the motor is started can be avoided, and the starting current of the motor can be measured. Meanwhile, the current transformer device comprises a plurality of current transformers, and the current transformers can be replaceably arranged between the current derivation device 101 and the ammeter 103, so that the detection range can be enlarged, the motors with different starting currents can be detected, and only the current transformers which are matched with the starting currents obtained by estimating the motors to be detected need to be selected and arranged between the current derivation device 101 and the ammeter 103. On the other hand, in the above embodiment of the present application, the ammeter 103 is further configured as a memory ammeter, so that the maximum instantaneous current during the motor start can be better recorded, and a more accurate instantaneous maximum current during the motor start can be obtained, and thus whether the motor start is normal or not can be more accurately determined.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A motor starting current detection device is characterized by comprising a current derivation device, a current mutual inductance device and an ammeter;
the current derivation device, the current mutual inductance device and the ammeter are connected in series in sequence.
2. The motor-starting-current detecting apparatus according to claim 1, wherein said current deriving means is a clamp-type current clamp.
3. The motor-starting-current detecting apparatus according to claim 2, wherein a first current transformer is provided in said split-core current clamp, and a secondary winding of said first current transformer is connected to said current transformer.
4. The motor-starting-current detecting apparatus according to claim 3, wherein said current transformer means includes a second current transformer, a current output wire of the secondary winding of said first current transformer passes through a toroidal core of said second current transformer, and the secondary winding of said second current transformer is connected to said ammeter.
5. The motor-starting-current detecting apparatus according to claim 4, wherein the second current transformer is detachably connected to the first current transformer, and the second current transformer is detachably connected to the ammeter.
6. The motor-starting-current detecting apparatus according to claim 5, wherein the secondary winding of the second current transformer includes a first interface and a second interface, and the ammeter includes a first interface and a second interface;
and a first interface of a secondary winding of the second current transformer is connected with a first interface of the ammeter, and a second interface of the secondary winding of the second current transformer is connected with a second interface of the ammeter.
7. The motor-starting-current detecting apparatus according to claim 5, wherein said current transformer means further comprises a third current transformer, a current output wire of a secondary winding of said first current transformer passes through a toroidal core of said second current transformer, a secondary winding of said second current transformer is connected to said ammeter; or a current output wire of the secondary winding of the first current transformer penetrates through the annular iron core of the third current transformer, and the secondary winding of the third current transformer is connected with the ammeter.
8. The motor-starting-current detecting apparatus according to claim 6, wherein said ammeter is a memory ammeter.
9. The motor-starting-current detecting apparatus according to claim 8, wherein said ammeter comprises a current display unit and a shift-position switching unit connected in parallel.
10. The motor-starting-current detecting apparatus according to claim 9, wherein said range switching unit includes a single-pole-multiple-throw switch and a plurality of resistors, said plurality of resistors being connected in parallel;
the single-pole multi-throw switch is provided with a first end and a plurality of second ends, the second ends correspond to the resistors one by one, and the second ends are respectively connected with one ends of the resistors;
the first end of the single-pole multi-throw switch is connected with a first interface of a secondary winding of the second current transformer, and the other ends of the resistors are respectively connected with a second interface of the secondary winding of the second current transformer.
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| CN202122927431.0U CN216411395U (en) | 2021-11-25 | 2021-11-25 | Motor starting current detection device |
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| CN202122927431.0U CN216411395U (en) | 2021-11-25 | 2021-11-25 | Motor starting current detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115407114A (en) * | 2022-08-30 | 2022-11-29 | 上海正泰智能科技有限公司 | Current detection method, current detection device, computer equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115407114A (en) * | 2022-08-30 | 2022-11-29 | 上海正泰智能科技有限公司 | Current detection method, current detection device, computer equipment and storage medium |
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