CN114675223A - Portable chargeable type remote control polarity tester for current transformer - Google Patents
Portable chargeable type remote control polarity tester for current transformer Download PDFInfo
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- CN114675223A CN114675223A CN202210165969.9A CN202210165969A CN114675223A CN 114675223 A CN114675223 A CN 114675223A CN 202210165969 A CN202210165969 A CN 202210165969A CN 114675223 A CN114675223 A CN 114675223A
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- 238000001514 detection method Methods 0.000 claims abstract description 14
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 39
- 238000004891 communication Methods 0.000 description 18
- 230000005540 biological transmission Effects 0.000 description 16
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 13
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- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000013522 software testing Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
Abstract
The utility model relates to a portable chargeable remote control current transformer polarity tester, which comprises a chargeable battery and a wireless remote control switch module, wherein the wireless remote control switch module comprises a signal detection module, a signal receiving module, a controller, a first normally open switch, a second normally open switch and a third normally open switch, the first normally open switch is connected between the positive terminal of the chargeable battery and the first terminal on the primary side of the phase A of a three-phase current transformer in series, the second normally open switch is connected between the positive terminal of the chargeable battery and the first terminal on the primary side of the phase B of the three-phase current transformer in series, the third normally open switch is connected between the positive terminal of the chargeable battery and the first terminal on the primary side of the phase C of the three-phase current transformer in series, and the negative end of the rechargeable battery is electrically connected with the second terminals of the primary sides of the phases of the three-phase current transformer, and the two terminals of the secondary sides of the phases of the three-phase current transformer are connected with an ammeter.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of transformer substation device testing, in particular to a portable rechargeable type polarity tester for a remote control current transformer.
Background
At present, in the process of carrying out relay protection debugging on a transformer substation, a current transformer needs to carry out a polarity test, and the polarity test is one of important factors influencing the success of power transmission. In the conventional test process of the polarity test, one tester hangs a special power test wire on the P1 and P2 sides of the primary side of a current transformer respectively, then fixes one special power test wire on the negative end of a battery, and the other special power test wire performs inching and continuous connection and disconnection on the positive end of the battery, so that a primary circulating current is formed in the current transformer and then reacts on the secondary side of the current transformer through the electromagnetic induction principle, and the other tester uses a pointer meter such as a milliammeter to perform measurement on the secondary side, so that the direction of the current can be visually displayed, and whether the polarity of the current transformer is correct or not is determined.
The test general condition of traditional polarity test needs to be mutually supported and contact by two experimenters and can only be accomplished, can accomplish the polarity test of a phase current transformer at every turn simultaneously, need carry out the cubic and can finish the polarity test of a three phase current transformer, and efficiency of software testing is whole low, and carries out the in-process that relay protection debugged at the transformer substation, can have some interfering signal and lead to three phase current transformer's polarity test result accuracy lower such as electromagnetic interference.
Disclosure of Invention
To solve the above technical problem or at least partially solve the above technical problem, an embodiment of the present disclosure provides a portable rechargeable remote-controlled current transformer polarity tester.
The disclosed embodiment provides a portable rechargeable type remote control current transformer polarity test, including:
a rechargeable battery;
the wireless remote control switch module comprises a signal detection module, a signal receiving module, a controller, a first normally-open switch, a second normally-open switch and a third normally-open switch, wherein the first normally-open switch is connected in series between the positive end of the rechargeable battery and the first terminal on the primary side of the A phase of the three-phase current transformer, the second normally-open switch is connected in series between the positive end of the rechargeable battery and the first terminal on the primary side of the B phase of the three-phase current transformer, the third normally-open switch is connected in series between the positive end of the rechargeable battery and the first terminal on the primary side of the C phase of the three-phase current transformer, the negative end of the rechargeable battery is electrically connected with the second terminal on each primary side of the three-phase current transformer, and two terminals on the secondary side of each phase of the three-phase current transformer are connected with an ammeter;
The signal detection module is used for detecting the wireless signal intensity between a remote controller and the current transformer polarity tester, and triggering the signal receiving module to receive a remote control instruction sent by the remote controller when the wireless signal intensity is determined to be greater than the preset signal intensity; the controller is used for receiving the remote control instruction sent by the signal receiving module and controlling the first normally open switch, the second normally open switch and the third normally open switch to be closed or opened simultaneously based on the remote control instruction.
In one embodiment, the remote control includes a display screen, the test meter further including:
the image acquisition device is arranged above each ammeter and used for acquiring the pointer change image of each ammeter;
and the data sending module is used for sending the pointer change images of the ammeters to the remote controller so that the display screen displays the pointer change images.
In one embodiment, the data sending module is further configured to send instruction information to the remote controller and display the instruction information on the display screen before the signal receiving module receives a remote control instruction sent by the remote controller, where the instruction information instructs a tester to send the remote control instruction.
In an embodiment, the signal detection module is configured to trigger the signal receiving module to receive the remote control instruction sent by the remote controller when it is determined that the wireless signal strength in a preset time period is continuously greater than the preset signal strength.
In one embodiment, the tester further comprises a battery charging module electrically connected with the rechargeable battery and used for supplying power to the wireless remote control switch module.
In one embodiment, the rechargeable battery comprises at least two lithium batteries connected in series.
In one embodiment, the wireless remote control switch module further comprises a housing, and the rechargeable battery and the wireless remote control switch module are arranged on the housing.
In one embodiment, the shell is a wood shell or a plastic shell.
In one embodiment, the first, second and third normally open switches are implemented by a hold relay.
In one embodiment, the ammeter is a milliammeter.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the portable rechargeable type remote control current transformer polarity tester provided by the embodiment of the disclosure is characterized in that the wireless remote control switch module comprises a signal detection module, a signal receiving module, a controller, a first normally open switch, a second normally open switch and a third normally open switch, the first normally open switch is connected in series between the positive terminal of the rechargeable battery and the first terminal on the primary side of the phase A of the three-phase current transformer, the second normally open switch is connected in series between the positive terminal of the rechargeable battery and the first terminal on the primary side of the phase B of the three-phase current transformer, the third normally open switch is connected in series between the positive terminal of the rechargeable battery and the first terminal on the primary side of the C phase of the three-phase current transformer, the negative end of the rechargeable battery is electrically connected with the second terminals of the primary sides of the phases of the three-phase current transformer, and an ammeter is connected between the two terminals of the secondary sides of the phases of the three-phase current transformer; the signal detection module is used for detecting the wireless signal intensity between a remote controller and the current transformer polarity tester, and triggering the signal receiving module to receive a remote control instruction sent by the remote controller when the wireless signal intensity is determined to be greater than the preset signal intensity; the controller is used for receiving the remote control instruction sent by the signal receiving module and controlling the first normally open switch, the second normally open switch and the third normally open switch to be closed or opened simultaneously based on the remote control instruction. So, can accomplish three phase current transformer's polarity test simultaneously at every turn, need not carry out cubic solitary test procedure, three phase current transformer's polarity efficiency of software testing has been improved, and carry out the in-process of relay protection debugging at the transformer substation, detect the radio signal intensity between remote controller and this current transformer polarity tester, when confirming that radio signal intensity is greater than preset signal intensity that remote controller signal is comparatively stable, just trigger signal receiving module receives the remote control instruction that the remote controller sent in order to test, so can avoid interference signal probably to the adverse effect of remote control instruction transmission, improve the reliability and the stability of remote control instruction transmission, thereby the polarity test result accuracy of three phase current transformer has been improved to a certain extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a polarity tester of a current transformer in accordance with an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a current transformer polarity tester according to another embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
It is to be understood that, hereinafter, "at least one" means one or more, "a plurality" means two or more. "and/or" is used to describe the association relationship of the associated objects, meaning that there may be three relationships, for example, "a and/or B" may mean: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural.
Fig. 1 is a schematic diagram of a portable rechargeable type remote-control polarity tester for a current transformer according to an embodiment of the present disclosure, which may include a rechargeable battery 101 and a wireless remote-control switch module. The wireless remote control switch module may include a signal detection module 201, a signal reception module 202, a controller 203, a first normally-open switch 204, a second normally-open switch 205, and a third normally-open switch 206, the first normally-open switch 204 is connected in series between the positive terminal of the rechargeable battery 101 and the first terminal P1 on the primary side of the a-phase of the three-phase current transformer, the second normally-open switch 205 is connected in series between the positive terminal of the rechargeable battery 101 and the first terminal P1 on the primary side of the B-phase of the three-phase current transformer, the third normally-open switch 206 is connected in series between the positive terminal of the rechargeable battery 101 and the first terminal P1 on the primary side of the C-phase of the three-phase current transformer (for convenience of distinction, connection wires such as a power test dedicated wire between the three normally-open switches and the positive terminal of the rechargeable battery are indicated by dotted lines in fig. 1), the negative terminal of the rechargeable battery 101 is electrically connected to the second terminals P2 on each phase of the three-phase current transformer, and two terminals of each phase secondary side of the three-phase current transformer are connected with an ammeter. Illustratively, the ammeter may be, but is not limited to, a milliammeter.
The signal detection module 201 is configured to detect a wireless signal strength between the remote controller 30 and the polarity tester of the current transformer, for example, a received signal strength indicator RSSI value, and trigger the signal receiving module 202 to receive a remote control instruction sent by the remote controller 30 when the wireless signal strength is determined to be greater than a preset signal strength; the controller 203 is configured to receive the remote control instruction sent by the signal receiving module 202, and control the first normally open switch 204, the second normally open switch 205, and the third normally open switch 206 to be closed or opened simultaneously based on the remote control instruction.
For example, the preset signal strength may be preset, and is not limited thereto. In one embodiment, the first normally open switch 204, the second normally open switch 205, and the third normally open switch 206 may be implemented by a hold relay. The remote control instruction can be a closing instruction or an opening instruction, the first normally-open switch 204, the second normally-open switch 205 and the third normally-open switch 206 are controlled to be closed at the same time when the closing instruction is received, for example, normally-open contacts of the relay are closed and kept, and then the first normally-open switch 204, the second normally-open switch 205 and the third normally-open switch 205 are controlled to be opened at the same time when the opening instruction is received, for example, the normally-open contacts of the relay are opened. The first normally-open switch 204, the second normally-open switch 205 and the third normally-open switch 206 are controlled to be closed and then switched off, which is equivalent to the realization of the inching operation of the positive terminal of the rechargeable battery 101, so that a primary loop current is formed in the three-phase current transformer, then, when the electromagnetic induction principle is reacted on the secondary side of the three-phase current transformer, and the induced current is generated on the secondary side of each phase of the three-phase current transformer, the pointer of each ammeter, such as a milliammeter, can rotate and change, namely, the direction of the current is displayed, so that whether the polarity of the three-phase current transformer is correct or not can be conveniently determined.
According to the scheme of the embodiment of the disclosure, the polarity test of the three-phase current transformer can be completed simultaneously at every time by one person through remote control, three independent test processes and the cooperation of other people are not needed, the polarity test efficiency of the three-phase current transformer is improved, in the process of carrying out relay protection debugging in a transformer substation, the wireless signal intensity between the remote controller 30 and the polarity tester of the current transformer is detected, when the wireless signal intensity is determined to be greater than the preset signal intensity, namely the remote controller signal is stable and reliable, the signal receiving module 202 is triggered to receive the remote control command sent by the remote controller for testing, the adverse effect of an interference signal on the transmission of the remote control command can be avoided, the reliability and the stability of the transmission of the remote control command are improved, and the accuracy of the polarity test result of the three-phase current transformer is improved to a certain extent.
In order to further improve the polarity testing efficiency and the accuracy of the polarity testing result of the three-phase current transformer, on the basis of the above embodiments, in an embodiment, the remote controller 30 may include a display screen (not shown), and the tester may further include: the image acquisition device is arranged above each ammeter and used for acquiring the pointer change image of each ammeter; and a data sending module, configured to send the pointer change image of each ammeter to the remote controller 30, so that the display screen displays each pointer change image.
For example, the image capturing device may be a camera, but is not limited thereto. The pointer change image may be a set of multiple images acquired by the camera, where each image includes a pointer of the ammeter, and the pointed position and time of the pointer in each image are different. A set of multiple images corresponding to the ammeter of each phase secondary side that will acquire are sent to the display screen of remote controller 30 and are shown to whether the polarity of three-phase current transformer is correct is confirmed to a set of multiple images of user's visual observation, so can further improve the polarity test result accuracy of three-phase current transformer, improve tester's test operation convenience simultaneously.
In an embodiment, the data sending module is further configured to send instruction information to the remote controller 30 and display the instruction information on the display screen before the signal receiving module 202 receives a remote control instruction sent by the remote controller 30, where the instruction information instructs a tester to send the remote control instruction.
Specifically, the signal detection module 201 detects the wireless signal strength between the remote controller 30 and the current transformer polarity tester, and when it is determined that the wireless signal strength is greater than the preset signal strength, the data transmission module is triggered to transmit the indication information to the remote controller 30 and the indication information is displayed on the display screen to indicate a tester to transmit a remote control instruction, the tester operates the remote controller 30 to generate and transmit the remote control instruction, and then the signal receiving module 202 receives the remote control instruction transmitted by the remote controller 30 so as to perform a specific test. Therefore, when the fact that the strength of the wireless signal is greater than the preset signal strength, that is, the remote controller signal is stable and reliable, the tester is instructed to operate the remote controller 30 to generate and send the remote control command, then the signal receiving module 202 receives the remote control command sent by the remote controller to test, adverse effects of interference signals on remote control command transmission can be further avoided, the reliability and stability of remote control command transmission are further improved, and the accuracy of the polarity test result of the three-phase current transformer is improved to a certain extent.
On the basis of any of the above embodiments, in an embodiment, the signal detection module 201 is configured to trigger the signal receiving module 202 to receive the remote control instruction sent by the remote controller 30 when it is determined that the wireless signal strength in a preset time period is continuously greater than the preset signal strength. When the wireless signal strength detected within a preset time period, for example, 5 seconds, that is, within 5 seconds, is continuously greater than the preset signal strength, the trigger signal receiving module 202 receives the remote control command sent by the remote controller 30, so that adverse effects that an interference signal may have on the transmission of the remote control command can be further avoided, the reliability and stability of the transmission of the remote control command are further improved, and the accuracy of the polarity test result of the three-phase current transformer is further improved.
In one embodiment, the tester further comprises a battery charging module (not shown) electrically connected to the rechargeable battery 101 and configured to supply power to the wireless remote switch module.
In one embodiment, the rechargeable battery 101 includes at least two lithium batteries connected in series. In normal times, the polarity test of the current transformer uses disposable dry batteries, and the dry batteries become garbage polluting the environment if the dry batteries are improperly disposed after the power is consumed. In the embodiment, the rechargeable lithium battery is used, so that the rechargeable lithium battery can be recycled, the traditional disposable dry battery is not used, the pollution to the environment is reduced to a certain extent, and the environment is indirectly protected.
In one embodiment, the tester may further include a housing, and the rechargeable battery 101 and the wireless remote control switch module are disposed on the housing to improve portability of the tester. For example, the housing may be a wood housing or a plastic housing, but is not limited thereto.
On the basis of any one of the above embodiments, in one embodiment, the signal receiving module may be a first LoRa (long rang) communication module, the remote controller may include a second LoRa communication module, the remote control command is sent to the first LoRa communication module by the second LoRa communication module of the remote controller, and the first LoRa communication module transmits the remote control command to the controller. And then the controller controls the first normally open switch 204, the second normally open switch 205 and the third normally open switch 206 to be closed and opened simultaneously based on the remote control instruction so as to perform polarity test.
Because in the process of carrying out relay protection debugging at the transformer substation, the test environment is complicated, interference signals such as electromagnetic interference and the like can exist, and the accuracy of the polarity test result of the three-phase current transformer is lower, therefore, the transmission of the remote control command is realized by adopting the LoRa communication module in the embodiment, the receiving sensitivity of LoRa wireless communication is as high as-140 dBm, the communication wall penetrating capacity is strong, the communication distance is long, the problem of communication transmission interference of data with small data volume such as the remote control command in the complicated test environment is solved, the adverse effect of the interference signals on the remote control command transmission is avoided, the reliability and the stability of the remote control command transmission are further improved, and the accuracy of the polarity test result of the three-phase current transformer is further improved.
Further, the signal detection module 201 is further configured to determine a current available channel within an LoRa communication frequency band, determine a target channel in the current available channel, and trigger the first LoRa communication module to communicate with the second LoRa communication module based on the target channel to transmit the remote control command, and when it is detected that the target channel is occupied or receives interference, determine another target channel in the current available channel, and trigger the first LoRa communication module to communicate with the second LoRa communication module based on the another target channel to transmit the remote control command. The frequency band of loRa communication is free frequency band at present, has occupied potential risk, can realize the channel of loRa communication and dodge the remote control instruction that communication transmission polarity tested through the above-mentioned scheme of this embodiment to improve the reliability and the stability of remote control instruction transmission, thereby further improve three phase current transformer's polarity test result accuracy.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functions of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units. The components shown as modules or units may or may not be physical units, i.e. may be located in one place or may also be distributed over a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the wood-disclosed scheme. One of ordinary skill in the art can understand and implement it without inventive effort.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a portable chargeable formula remote control current transformer polarity tester which characterized in that includes:
a rechargeable battery;
the wireless remote control switch module comprises a signal detection module, a signal receiving module, a controller, a first normally-open switch, a second normally-open switch and a third normally-open switch, wherein the first normally-open switch is connected in series between the positive end of the rechargeable battery and the first terminal on the primary side of the A phase of the three-phase current transformer, the second normally-open switch is connected in series between the positive end of the rechargeable battery and the first terminal on the primary side of the B phase of the three-phase current transformer, the third normally-open switch is connected in series between the positive end of the rechargeable battery and the first terminal on the primary side of the C phase of the three-phase current transformer, the negative end of the rechargeable battery is electrically connected with the second terminal on each primary side of the three-phase current transformer, and two terminals on the secondary side of each phase of the three-phase current transformer are connected with an ammeter;
the signal detection module is used for detecting the wireless signal intensity between a remote controller and the current transformer polarity tester, and triggering the signal receiving module to receive a remote control instruction sent by the remote controller when the wireless signal intensity is determined to be greater than the preset signal intensity; the controller is used for receiving the remote control instruction sent by the signal receiving module and controlling the first normally open switch, the second normally open switch and the third normally open switch to be closed or opened simultaneously based on the remote control instruction.
2. The current transformer polarity tester of claim 1, wherein the remote control comprises a display screen, the tester further comprising:
the image acquisition device is arranged above each ammeter and used for acquiring the pointer change image of each ammeter;
and the data sending module is used for sending the pointer change images of the ammeters to the remote controller so that the display screen displays the pointer change images.
3. The polarity tester of claim 2, wherein the data sending module is further configured to send indication information to the remote controller and display the indication information on the display screen before the signal receiving module receives a remote control command sent by the remote controller, and the indication information indicates a tester to send the remote control command.
4. The current transformer polarity tester of any one of claims 1 to 3, wherein the signal detection module is configured to trigger the signal receiving module to receive the remote control command sent by the remote controller when it is determined that the wireless signal strength in a preset time period is continuously greater than the preset signal strength.
5. The polarity tester of the current transformer according to claim 4, further comprising a battery charging module electrically connected to the rechargeable battery and configured to supply power to the wireless remote switch module.
6. The current transformer polarity tester of claim 5, wherein the rechargeable battery comprises at least two lithium batteries connected in series.
7. The current transformer polarity tester of claim 5, further comprising a housing, wherein the rechargeable battery and the wireless remote switch module are disposed on the housing.
8. The current transformer polarity tester of claim 7, wherein the housing is a wood housing or a plastic housing.
9. The current transformer polarity tester of claim 5, wherein the first, second and third normally open switches are implemented by a hold relay.
10. The current transformer polarity tester of claim 5, wherein the ammeter is a milliammeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210165969.9A CN114675223A (en) | 2022-02-22 | 2022-02-22 | Portable chargeable type remote control polarity tester for current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210165969.9A CN114675223A (en) | 2022-02-22 | 2022-02-22 | Portable chargeable type remote control polarity tester for current transformer |
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| CN114675223A true CN114675223A (en) | 2022-06-28 |
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| CN113219392A (en) * | 2021-04-30 | 2021-08-06 | 内蒙古送变电有限责任公司 | Portable chargeable formula remote control current transformer polarity tester |
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Application publication date: 20220628 |