Three-phase three-wire system open-phase detection device and method

Abstract

The invention relates to the technical field of open-phase detection, in particular to a three-phase three-wire system open-phase detection device and method.The three-phase three-wire system open-phase detection device comprises an open-phase detector body, a detection unit, a wearing unit and a positioning unit, and the positioning unit comprises a mounting frame, a cover plate, a first spring, a fixing block, a connecting rod, a suction cup and a locking unit; the locking unit is loosened and does not abut against the cover plate, so that a worker can conveniently rotate the cover plate, display the mounting frame, start to stretch a first spring and push a suction cup out of the mounting frame, the worker can conveniently place the suction cup at a designated position, the suction cup is stably adsorbed at the designated position, and then the position of the open-phase detector body is fixed; therefore, the problems that when an existing three-phase alternating current open-phase detection circuit device is used, an arm needs to be lifted for a long time, the detection state of an open-phase detector body needs to be observed conveniently, the arm of a worker is fatigued after a long time, and subsequent detection operation is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of phase loss detection, and in particular to a three-phase three-wire phase loss detection device and method. Background Art

[0002] The phase sequence UVWU of the three electromotive forces is called the positive phase sequence. If the rotor of the generator rotates counterclockwise, the phase sequence of the three-phase electromotive force will be opposite, that is, UWVU. This phase sequence is called a reverse phase sequence. The phase sequence problem must be considered when a three-phase motor is connected to a power supply. The existing three-phase AC phase loss detector is usually handheld. When in use, the detector needs to be connected to the three phases of the AC power at the same time. The detector needs to be put down when checking the line, which can easily cause wear of the detector.

[0003] At present, the prior art discloses a circuit device for detecting phase loss in three-phase alternating current, comprising a phase loss detector body and a connecting wire, wherein a phase loss indicator light and a control button are respectively embedded and installed on the front of the phase loss detector body, the connecting wire is connected to the phase loss detector body by plugging, and three connecting wires are provided, and an elastic band is connected to the back of the phase loss detector body; it also comprises a stabilizing plate, each of which has a stabilizing notch corresponding to the connecting wire, and a supporting component for supporting the stabilizing plate is also provided on the phase loss detector body; when in use, the phase loss detector body can be worn on the wrist of the detection personnel by means of the elastic band, which is very convenient to use and easy to carry; the provision of the stabilizing plate makes the plugging of the connecting wire more stable, ensures the reliability of the plugging of the connecting wire, and facilitates accurate detection.

[0004] However, when using the above method, the staff wears the phase loss detector body on the wrist through an elastic band, and connects the connecting line to the phase loss detector body to perform phase loss detection. When the staff wears the phase loss detector body in use, they need to raise their arms for a long time to observe the detection status of the phase loss detector body. After a long time, the staff's arms become tired, which affects subsequent detection operations. Summary of the invention

[0005] The purpose of the present invention is to provide a three-phase three-wire phase loss detection device and method, aiming to solve the problem that when using the existing three-phase AC phase loss detection circuit device, the operator needs to raise his arm for a long time to observe the detection status of the phase loss detector body, which causes fatigue in the operator's arm after a long time, affecting subsequent detection operations.

[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides a three-phase three-wire phase loss detection device, comprising a phase loss detector body, a detection unit, a wearing unit and a positioning unit, wherein the detection unit is arranged on one side of the phase loss detector body, the wearing unit is arranged on the side of the phase loss detector body, and the positioning unit comprises a mounting frame, a cover plate, a first spring, a fixing block, a connecting rod, a suction cup and a locking unit;

[0007] The mounting frame is fixedly connected to the phase absence detector body and is located at the bottom of the phase absence detector body. The cover plate is rotatably connected to the mounting frame and is located at the side of the mounting frame. The first spring is fixedly connected to the mounting frame and is located in the mounting frame. The fixed block is fixedly connected to the first spring and is slidably connected to the mounting frame and is located at one side of the mounting frame. The connecting rod is slidably connected to the mounting frame and is fixedly connected to the fixed block and passes through the mounting frame. The suction cup is fixedly connected to the fixed block and is located at one side of the fixed block. The locking unit is arranged on one side of the cover plate.

[0008] Wherein, the detection unit includes a connecting frame and an auxiliary plate, the connecting frame is fixedly connected to the phase loss detector body and is located on one side of the phase loss detector body, and the auxiliary plate is fixedly connected to the connecting frame and is located on the side of the connecting frame.

[0009] Among them, the wearing unit includes a fixing frame, a connecting belt, a locking frame and a locking buckle, the fixing frame is fixedly connected to the installation frame and is located on the side of the installation frame, the connecting belt is fixedly connected to the fixing frame and is located on the side of the fixing frame, the locking frame is fixedly connected to the connecting belt and is located on one side of the connecting belt, and the locking buckle is fixedly connected to the connecting belt and is located on the side of the connecting belt.

[0010] Wherein, the locking unit includes a limit frame, an insert plate, a push piece and a second spring, the limit frame is fixedly connected to the installation frame and is located on one side of the installation frame, the insert plate is fixedly connected to the cover plate, and is slidably connected to the limit frame and is located on one side of the limit frame, the push piece is rotatably connected to the insert plate and is located on one side of the insert plate, and the second spring is fixedly connected to the push piece, fixedly connected to the limit frame, and is located at the bottom of the push piece.

[0011] Wherein, the connecting belt includes a long belt, a short belt and a frame, the long belt is fixedly connected to the fixing frame and the lock buckle, and is located on one side of the fixing frame, the short belt is fixedly connected to the fixing frame and the lock frame, and is located on a side of the fixing frame away from the long belt, and the frame is fixedly connected to the short belt and is located on one side of the short belt.

[0012] Wherein, the connecting belt also includes a connecting head, which is fixedly connected to the long belt and is located on a side of the long belt away from the fixing frame.

[0013] In a second aspect, the present invention further provides a three-phase three-wire phase loss detection method, comprising the following steps:

[0014] The phase failure detector body is worn on the wrist or fixed at a designated position according to the position of the worker;

[0015] Place the connection wires that need to be tested on the auxiliary sheet;

[0016] Fix the position of the phase loss detector body and start the phase loss detector body;

[0017] The staff observes the signal indication of the phase loss detector body and determines the status of the connecting line.

[0018] According to the present invention, a three-phase three-wire phase loss detection device, when a staff member needs to perform phase loss detection on a three-phase three-wire connection, firstly, according to the staff member's own position, he chooses to wear the phase loss detector body or fix the phase loss detector body at a designated position. When placing the phase loss detector body at the designated position, firstly, the locking unit is loosened so that it no longer presses against the cover plate, so that the staff member can rotate the cover plate to display the installation frame. At this time, the first spring starts to stretch, pushing the fixing block to move on the installation frame, pushing the suction cup out of the installation frame, so that the staff member can place the suction cup at the designated position conveniently, and the suction cup is stably adsorbed at the designated position, thereby fixing the phase loss detector body. The position is fixed. At this time, the staff can connect the connecting wire to the detection mechanism and start the phase loss detector body to detect the status of the three-phase connected wire. After completing the detection, the staff can hold the connecting rod to drive the fixed block to move, compress the first spring, and then retract the suction cup on the fixed block into the installation frame, so that the staff can turn the cover plate to close the installation frame and use the locking unit to fix the position of the cover plate, thereby solving the problem that the existing three-phase AC phase loss detection circuit device needs to lift the arm for a long time when in use to observe the detection status of the phase loss detector body. After a long time, the staff's arm becomes tired, affecting the subsequent detection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0020] Figure 1It is a schematic diagram of the overall structure of a first embodiment of a three-phase three-wire phase loss detection device of the present invention.

[0021] Figure 2 It is a schematic diagram of the overall structure of the first embodiment of a three-phase three-wire phase loss detection device of the present invention from another angle.

[0022] Figure 3 It is a schematic diagram of the overall structure of the first embodiment of a three-phase three-wire phase loss detection device of the present invention from another angle.

[0023] Figure 4 It is a schematic diagram of the overall structure of the first embodiment of a three-phase three-wire phase loss detection device of the present invention from another angle.

[0024] Figure 5 The figure is a schematic diagram of the structure of a locking unit of a first embodiment of a three-phase three-wire phase loss detection device of the present invention.

[0025] Figure 6 It is a schematic diagram of the overall structure of a second embodiment of a three-phase three-wire phase loss detection device of the present invention.

[0026] Figure 7 It is a schematic diagram of the overall structure from another angle of the second embodiment of a three-phase three-wire phase loss detection device of the present invention.

[0027] Figure 8 The present invention is a flow chart of a three-phase three-wire system phase loss detection method.

[0028] 101-phase loss detector body, 102-detection unit, 103-wearing unit, 104-positioning unit, 105-installation frame, 106-cover plate, 107-first spring, 108-fixing block, 109 connecting rod, 110-suction cup, 111-locking unit, 112-connecting frame, 113-auxiliary plate, 114-fixing frame, 115-connecting belt, 116-locking frame, 117-locking buckle, 118-limiting frame, 119-plug plate, 120-pressing plate, 121-second spring, 122-long belt, 123-short belt, 124-frame, 125-connecting head, 201-transparent cover, 202-transparent plate, 203-cushion. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0030] In a first aspect, a first embodiment of a three-phase three-wire phase loss detection device of the present invention is:

[0031] See also Figure 1 to Figure 5 , Figure 1 FIG. 1 is a schematic diagram of the overall structure of a first embodiment of a three-phase three-wire phase loss detection device of the present invention. Figure 2 1 is a schematic diagram of the overall structure of a first embodiment of a three-phase three-wire phase loss detection device of the present invention from another angle, Figure 3 1 is a schematic diagram of the overall structure of a first embodiment of a three-phase three-wire phase loss detection device of the present invention from another angle, Figure 4 1 is a schematic diagram of the overall structure of a first embodiment of a three-phase three-wire phase loss detection device of the present invention from another angle, Figure 5 The figure is a schematic diagram of the structure of a locking unit of a first embodiment of a three-phase three-wire phase loss detection device of the present invention.

[0032] A three-phase three-wire phase loss detection device of the present invention comprises a phase loss detector body 101, a detection unit 102, a wearing unit 103 and a positioning unit 104, wherein the positioning unit 104 comprises a mounting frame 105, a cover plate 106, a first spring 107, a fixing block 108, a connecting rod 109, a suction cup 110 and a locking unit 111; the detection unit 102 comprises a connecting frame 112 and an auxiliary sheet 113, and the wearing unit 103 comprises a fixing frame 114, a connecting belt 115, a locking frame 116 and The lock buckle 117, the locking unit 111 includes a limit frame 118, a plug plate 119, a push piece 120 and a second spring 121, and the connecting belt 115 includes a long belt 122, a short belt 123, a frame 124 and a connector 125. The above-mentioned scheme solves the problem that when using the existing circuit device for three-phase AC phase loss detection, the operator needs to raise the arm for a long time to observe the detection status of the phase loss detector body 101. After a long time, the operator's arm becomes tired, which affects the subsequent detection operations.

[0033] According to this specific embodiment, the detection unit 102 is arranged on one side of the phase loss detector body 101, the wearing unit 103 is arranged on the side of the phase loss detector body 101, the mounting frame 105 is fixedly connected to the phase loss detector body 101 and is located at the bottom of the phase loss detector body 101, the cover plate 106 is rotatably connected to the mounting frame 105 and is located on the side of the mounting frame 105, the first spring 107 is fixedly connected to the mounting frame 105 and is located in the mounting frame 105, the fixing block 108 is fixedly connected to the first spring 107, and is slidably connected to the mounting frame 105 and is located On one side of the installation frame 105, the connecting rod 109 is slidably connected to the installation frame 105, and is fixedly connected to the fixing block 108 and passes through the installation frame 105. The suction cup 110 is fixedly connected to the fixing block 108 and is located on one side of the fixing block 108. The locking unit 111 is arranged on one side of the cover plate 106. When the staff needs to perform phase loss detection on the three-phase connection line, firstly, according to the position of the staff, choose to wear the phase loss detector body 101 or fix the phase loss detector body 101 at the specified position. When the phase loss detector body 101 is placed at the specified position, first, the locking unit 111 is fixedly connected to the fixing block 108 and is located on one side of the fixing block 108. The element 111 is loosened so that it no longer presses against the cover plate 106, which makes it convenient for the staff to rotate the cover plate 106 and display the installation frame 105. At this time, the first spring 107 begins to stretch, pushing the fixing block 108 to move on the installation frame 105, and pushing the suction cup 110 out of the installation frame 105, which makes it convenient for the staff to place the suction cup 110 at the specified position. The suction cup 110 is stably adsorbed at the specified position, thereby fixing the position of the phase loss detector body 101. At this time, the staff can connect the connecting line to the detection mechanism and start the phase loss detector body 101 to detect the status of the three-phase connection line. After completing the detection, the staff can hold the connecting rod 109 to drive the fixed block 108 to move, compress the first spring 107, and then retract the suction cup 110 on the fixed block 108 into the installation frame 105, so that the staff can rotate the cover 106 to close the installation frame 105, and use the locking unit 111 to fix the position of the cover 106, thereby solving the problem that the existing circuit device for three-phase AC phase loss detection needs to be raised for a long time when in use to facilitate observation of the detection status of the phase loss detector body 101, and the staff's arm becomes tired after a long time, affecting the subsequent detection operation.

[0034] Among them, the connecting frame 112 is fixedly connected to the phase loss detector body 101 and is located on one side of the phase loss detector body 101, and the auxiliary piece 113 is fixedly connected to the connecting frame 112 and is located on the side of the connecting frame 112. The staff can place the three-phase connection line along the auxiliary piece 113 so that it can be connected to the phase loss detector body 101, and fix the position of the auxiliary piece 113 through the connecting frame 112. After the placement is completed, the staff can press the button on the phase loss detector body 101 and observe the indicator light corresponding to the three-phase connection line to determine the status of the three-phase connection line.

[0035] Secondly, the fixing frame 114 is fixedly connected to the installation frame 105 and is located on the side of the installation frame 105, the connecting belt 115 is fixedly connected to the fixing frame 114 and is located on the side of the fixing frame 114, the locking frame 116 is fixedly connected to the connecting belt 115 and is located on one side of the connecting belt 115, the locking buckle 117 is fixedly connected to the connecting belt 115 and is located on the side of the connecting belt 115, the cushion 203 is fixedly connected to the cover plate 106 and is located on the On one side of the cover 106, when it is necessary to detect the three-phase connection line, and there is no condition to place the phase loss detector body 101 around the staff, the connecting belt 115 can be pulled out from the fixing frame 114, and the connecting belt 115 can be wrapped around the wrist of the staff, and the buckle 117 can be slid into the locking frame 116 to fix the position of the connecting belt 115, and then the phase loss detector body 101 can be fixed on the wrist of the staff, so as to facilitate the subsequent detection of the three-phase connection line.

[0036] Again, the limit frame 118 is fixedly connected to the installation frame 105 and is located on one side of the installation frame 105. The plug plate 119 is fixedly connected to the cover plate 106 and is slidably connected to the limit frame 118 and is located on one side of the limit frame 118. The push piece 120 is rotatably connected to the plug plate 119 and is located on one side of the plug plate 119. The second spring 121 is fixedly connected to the push piece 120 and is fixedly connected to the limit frame 118 and is located at the bottom of the push piece 120. When it is necessary to rotate the cover plate 106 to unfold the installation frame 105, the staff can press the push piece 120 to compress the second spring 121 so that the push piece 120 can rotate on the plug plate 119 and no longer jam the limit frame 118, making it convenient for the staff to slide the plug plate 119 out of the limit frame 118, thereby no longer limiting the cover plate 106.

[0037] In addition, the long strap 122 is fixedly connected to the fixing frame 114, and is fixedly connected to the lock buckle 117, and is located on one side of the fixing frame 114; the short strap 123 is fixedly connected to the fixing frame 114, and is fixedly connected to the lock frame 116, and is located on a side of the fixing frame 114 away from the long strap 122; the frame 124 is fixedly connected to the short strap 123, and is located on one side of the short strap 123. When the phase absence detector body 101 needs to be worn on the wrist of the staff, the phase absence detector body 101 is first placed on the wrist, and the long strap 122 is pulled. According to the size of the staff's wrist, the lock buckle 117 at a suitable position on the long strap 122 is slid into the lock frame 116, so that the long strap 122 and the short strap 123 are fixed to the staff's hand, and the excess part of the long strap 122 can pass through the frame 124 on the short strap 123 to avoid the excess part of the long strap 122 being scattered.

[0038] At the same time, the connecting head 125 is fixedly connected to the long belt 122 and is located on the side of the long belt 122 away from the fixing frame 114. The staff can pull the connecting head 125 to drive the long belt 122 to pass through the frame 124, which is convenient for the staff to use.

[0039] In this embodiment, when the staff needs to perform phase loss detection on the three-phase connection line, first, according to the staff's own position, they choose to wear the phase loss detector body 101 or fix the phase loss detector body 101 at a specified position. When placing the phase loss detector body 101 at the specified position, they first press the pressing piece 120 to compress the second spring 121, so that the pressing piece 120 can rotate on the plug plate 119 and no longer get stuck in the limit frame 118, which is convenient for the staff to slide the plug plate 119 out of the limit frame 118, and then no longer limit the cover plate 106, which is convenient for the staff to rotate the cover plate 106 and install the The mounting frame 105 is displayed. At this time, the first spring 107 begins to stretch, pushing the fixing block 108 to move on the mounting frame 105, and pushing the suction cup 110 out of the mounting frame 105, so that the staff can place the suction cup 110 at the specified position. The suction cup 110 is stably adsorbed at the specified position, thereby fixing the position of the phase loss detector body 101. At this time, the staff can place the three-way connection line along the auxiliary piece 113 so that it can be connected to the phase loss detector body 101, and fix the position of the auxiliary piece 113 through the connecting frame 112. After the placement is completed, the staff can press the phase loss detector body The button on 101 is pressed, and the indicator light corresponding to the three-phase connection line is observed to determine the status of the three-phase connection line. After completing the detection, the staff can hold the connecting rod 109 to drive the fixing block 108 to move, compress the first spring 107, and then recycle the suction cup 110 on the fixing block 108 into the installation frame 105, so that the staff can turn the cover plate 106 to close the installation frame 105. When the phase loss detector body 101 needs to be worn on the wrist of the staff, the phase loss detector body 101 is first placed on the wrist, and the long belt 122 is pulled to close the long belt 122 according to the size of the staff's wrist. The lock buckle 117 in a suitable position slides into the lock frame 116, so that the long strap 122 and the short strap 123 are fixed on the staff's hand, and then the phase loss detector body 101 is fixed on the staff's wrist, which is convenient for the subsequent detection of the three-phase connection line. During the detection, the staff can press the button on the phase loss detector body 101 and observe the indicator light corresponding to the three-phase connection line, and then judge the status of the three-phase connection line, thereby solving the problem that the existing circuit device for three-phase AC phase loss detection needs to raise the arm for a long time when in use to facilitate the observation of the detection status of the phase loss detector body 101, and the staff's arm becomes tired after a long time, affecting the subsequent detection operation.

[0040] A second embodiment of a three-phase three-wire phase loss detection device of the present invention is:

[0041] See also Figure 6-7 , Figure 6 is a schematic diagram of the overall structure of a second embodiment of a three-phase three-wire phase loss detection device of the present invention, Figure 7 It is a schematic diagram of the overall structure from another angle of the second embodiment of a three-phase three-wire phase loss detection device of the present invention.

[0042] The detection unit 102 of the three-phase three-wire phase loss detection device of the present invention further includes a transparent cover 201 and a transparent plate 202 , and the wearing unit 103 further includes a soft cushion 203 .

[0043] The transparent cover 201 is fixedly connected to the phase loss detector body 101 and the connecting frame 112, and is located on one side of the phase loss detector body 101. The transparent plate 202 is fixedly connected to the phase loss detector body 101 and is located on the top of the phase loss detector body 101. The staff can observe the status of the three-phase connection line connected to the phase loss detector body 101 on the auxiliary plate 113 through the transparent cover 201, and the status panel of the phase loss detector body 101 is protected by the transparent plate 202.

[0044] Finally, the soft pad 203 is fixedly connected to the cover plate 106 and is located on one side of the cover plate 106 . When a worker wears the phase loss detector body 101 , the soft pad 203 protects the worker's wrist.

[0045] In this embodiment, the staff can observe the status of the three-phase connection line connected to the phase loss detector body 101 on the auxiliary piece 113 through the transparent cover 201, and the status panel of the phase loss detector body 101 is protected by the transparent plate 202, and when the staff wears the phase loss detector body 101, the staff's wrist is protected by the soft pad 203.

[0046] In a second aspect, the present invention further provides a three-phase three-wire phase loss detection method, comprising:

[0047] S1 selects whether to wear the phase loss detector body 101 on the wrist or fix it at a designated position according to the position of the staff;

[0048] S2 places the connection wires to be tested on the auxiliary sheet 113;

[0049] S3 fixes the position of the phase loss detector body 101 and starts the phase loss detector body 101;

[0050] S4 The staff observes the signal indication of the phase failure detector body 101 and determines the status of the connecting line.

[0051] In the embodiment of the present invention, when the staff needs to perform phase loss detection on the three-phase connection line, first, according to the staff's own position, they choose to wear the phase loss detector body 101 or fix the phase loss detector body 101 at the designated position. When placing the phase loss detector body 101 at the designated position, first release the locking unit 111 so that it no longer presses against the cover plate 106, so that the staff can rotate the cover plate 106 to display the installation frame 105. At this time, the first spring 107 begins to stretch, pushing the fixing block 108 to move on the installation frame 105, and pushing the suction cup 110 out of the installation frame 105, so that the staff can place the suction cup 110 at the designated position. The suction cup 110 is stably adsorbed at the designated position, thereby fixing the phase loss detector body 101. The position is fixed. At this time, the staff can connect the connecting line to the detection mechanism and start the phase loss detector body 101 to detect the status of the three-phase connected line. After completing the detection, the staff can hold the connecting rod 109 to drive the fixed block 108 to move, compress the first spring 107, and then recycle the suction cup 110 on the fixed block 108 into the installation frame 105, so that the staff can turn the cover 106 to close the installation frame 105, and use the locking unit 111 to fix the position of the cover 106, thereby solving the problem that the existing three-phase AC phase loss detection circuit device needs to lift the arm for a long time when in use to observe the detection status of the phase loss detector body 101. After a long time, the staff's arm becomes tired, affecting the subsequent detection operation.

[0052] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A three-phase three-wire phase loss detection device and method, characterized in that: It includes a phase loss detector body, a detection unit, a wearing unit and a positioning unit, wherein the detection unit is arranged on one side of the phase loss detector body, the wearing unit is arranged on the side of the phase loss detector body, and the positioning unit includes a mounting frame, a cover plate, a first spring, a fixing block, a connecting rod, a suction cup and a locking unit; The mounting frame is fixedly connected to the phase absence detector body and is located at the bottom of the phase absence detector body. The cover plate is rotatably connected to the mounting frame and is located at the side of the mounting frame. The first spring is fixedly connected to the mounting frame and is located in the mounting frame. The fixed block is fixedly connected to the first spring and is slidably connected to the mounting frame and is located at one side of the mounting frame. The connecting rod is slidably connected to the mounting frame and is fixedly connected to the fixed block and passes through the mounting frame. The suction cup is fixedly connected to the fixed block and is located at one side of the fixed block. The locking unit is arranged on one side of the cover plate.

2. A three-phase three-wire phase loss detection device as claimed in claim 1, characterized in that: The detection unit includes a connecting frame and an auxiliary piece. The connecting frame is fixedly connected to the phase loss detector body and is located on one side of the phase loss detector body. The auxiliary piece is fixedly connected to the connecting frame and is located on the side of the connecting frame.

3. A three-phase three-wire phase loss detection device as claimed in claim 2, characterized in that: The wearing unit includes a fixing frame, a connecting belt, a locking frame and a locking buckle. The fixing frame is fixedly connected to the installation frame and is located on the side of the installation frame. The connecting belt is fixedly connected to the fixing frame and is located on the side of the fixing frame. The locking frame is fixedly connected to the connecting belt and is located on one side of the connecting belt. The locking buckle is fixedly connected to the connecting belt and is located on the side of the connecting belt.

4. A three-phase three-wire phase loss detection device as claimed in claim 3, characterized in that: The locking unit includes a limit frame, an insert plate, a push piece and a second spring. The limit frame is fixedly connected to the installation frame and is located at one side of the installation frame. The insert plate is fixedly connected to the cover plate and is slidably connected to the limit frame and is located at one side of the limit frame. The push piece is rotatably connected to the insert plate and is located at one side of the insert plate. The second spring is fixedly connected to the push piece and is fixedly connected to the limit frame and is located at the bottom of the push piece.

5. A three-phase three-wire phase loss detection device as claimed in claim 4, characterized in that: The connecting belt includes a long belt, a short belt and a frame. The long belt is fixedly connected to the fixing frame and the lock buckle and is located on one side of the fixing frame. The short belt is fixedly connected to the fixing frame and the lock frame and is located on a side of the fixing frame away from the long belt. The frame is fixedly connected to the short belt and is located on one side of the short belt.

6. A three-phase three-wire phase loss detection device as claimed in claim 5, characterized in that: The connecting belt also includes a connecting head, which is fixedly connected to the long belt and is located at a side of the long belt away from the fixing frame.

7. A three-phase three-wire phase loss detection method, applied to a three-phase three-wire phase loss detection device as claimed in any one of claims 1 to 6, characterized in that: include: The phase failure detector body is worn on the wrist or fixed at a designated position according to the position of the worker; Place the connection wires that need to be tested on the auxiliary sheet; Fix the position of the phase loss detector body and start the phase loss detector body; The staff observes the signal indication of the phase loss detector body and determines the status of the connecting line.

Images