Open-phase detection device for three-phase power supply

Abstract

The utility model discloses an open-phase detection device for a three-phase power supply, which belongs to the technical field of electrical automation and comprises a relay base, and one end of the relay base is provided with a first phase alternating current binding post, a second phase alternating current binding post, a third phase alternating current binding post and a zero line binding post. A first relay, a second relay and a third relay are arranged at the top of the relay base; the first phase alternating current binding post and the zero line binding post are both connected with a coil of the first relay; the second phase alternating current binding post is connected with a normally open node of the first relay, the normally open node of the first relay is connected with a coil of the second relay, and the coil of the second relay is connected with the zero line binding post; the third phase alternating current binding post is connected with a normally open node of the second relay, the normally open node of the second relay is connected with a coil of the third relay, and the coil of the third relay is connected with the zero line binding post; and one end of the relay base is also provided with a working part binding post. The use is convenient, time-saving and labor-saving.

Description

Technical Field

[0001] This utility model belongs to the field of electrical automation technology, specifically relating to a phase loss detection device for three-phase power supply. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] Currently, there are strict requirements for three-phase power supply in the field of automated production. Among them, phase loss is the most serious power problem for three-phase electrical equipment, which can easily lead to damage to the equipment. Therefore, it is necessary to monitor phase loss for three-phase power.

[0004] Currently, there is an increasing number of devices for three-phase monitoring, including various types of three-phase detection devices such as phase sequence protectors, over / under voltage protectors, and phase loss protection circuit breakers. However, in actual use, if these three-phase detection devices are damaged, they need to be replaced in time to continue production. Conventional three-phase power detection equipment is expensive, costing hundreds to thousands of yuan. Moreover, due to its complex structure, it requires a large number of components to realize its functions. The increase in components also leads to an increase in the failure rate. Furthermore, in automated production, some production equipment and control cabinets are located in very harsh environments, which makes three-phase power monitoring equipment more prone to damage.

[0005] During the maintenance and replacement process, the repair and replacement of conventional three-phase power supply testing equipment is extremely difficult. It not only requires highly specialized skills, but also makes it impossible to restore its functionality quickly or even repair it at all. There are often problems such as the need to identify and replace damaged spare parts, which leads to long replacement operation times, and the inability of technicians to quickly determine the extent of the damage, which leads to the inability to complete the maintenance and replacement work in a timely manner. This is not only time-consuming and labor-intensive, but also causes long-term power outages of production equipment, which greatly affects production efficiency. Currently, maintenance operations basically involve directly replacing the damaged three-phase power supply monitoring equipment with new equipment, which further increases production costs.

[0006] Therefore, how to design and provide a device for phase loss detection in three-phase electrical equipment to solve the above problems is a technical problem that urgently needs to be solved in the field of electrical automation technology. Utility Model Content

[0007] The purpose of this invention is to provide a phase loss detection device for three-phase power supplies that is compatible with ordinary standard relays. It uses standard relays as detection units, and when a relay is damaged, the phase loss detection function can be restored simply by unplugging the old relay and replacing it with a new one. It is convenient to use, saves time and effort, and greatly improves the efficiency of the entire phase loss detection operation. In addition, ordinary relays have a longer service life and are more adaptable to the operating environment than conventional three-phase power monitoring devices, and the detection cost is greatly reduced.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0009] In a first aspect, an embodiment of the present invention provides a phase loss detection device for a three-phase power supply, including a relay base. One end of the relay base is provided with a first phase AC power terminal, a second phase AC power terminal, a third phase AC power terminal and a neutral wire terminal. The top of the relay base is provided with a first relay, a second relay and a third relay.

[0010] The first phase AC power terminal and the neutral terminal are both connected to the coil of the first relay; the second phase AC power terminal is connected to the normally open contact of the first relay, the normally open contact of the first relay is connected to the coil of the second relay, and the coil of the second relay is connected to the neutral terminal; the third phase AC power terminal is connected to the normally open contact of the second relay, the normally open contact of the second relay is connected to the coil of the third relay, and the coil of the third relay is connected to the neutral terminal.

[0011] One end of the relay base is also provided with a working part terminal.

[0012] As a further technical solution, the first relay is disposed on a relay base close to the first phase AC terminal, a second relay is disposed on a relay base away from the first phase AC terminal, and a third relay is disposed on a relay base away from the first relay.

[0013] As a further technical solution, the relay base is provided with multiple mounting holes.

[0014] As a further technical solution, the relay base is provided with a first relay pin socket, a second relay pin socket and a third relay pin socket.

[0015] As a further technical solution, the first relay pin socket is connected to the first relay, the second relay pin socket is connected to the second relay, and the third relay pin socket is connected to the third relay.

[0016] As a further technical solution, the first phase AC power terminal, the second phase AC power terminal, the third phase AC power terminal and the neutral wire terminal are set at a certain distance apart.

[0017] As a further technical solution, a three-phase power supply indicator is provided on the relay base near the first phase AC power terminal, the second phase AC power terminal, the third phase AC power terminal and the neutral terminal.

[0018] As a further technical solution, a first-phase AC power label is provided next to the first-phase AC power terminal, a second-phase AC power label is provided next to the second-phase AC power terminal, a third-phase AC power label is provided next to the third-phase AC power terminal, and a neutral wire label is provided next to the neutral wire terminal.

[0019] As a further technical solution, the working part has multiple terminals, which are respectively arranged on both sides of the relay base.

[0020] As a further technical solution, the bottom of the relay base is provided with a guide rail type mounting fastener.

[0021] The beneficial effects of the above-described embodiments of this utility model are as follows:

[0022] The three-phase power supply phase loss detection device provided by this utility model, compared with the electronic design of the prior art, adopts a relay base plug-and-play relay method to monitor the phase loss fault of the three-phase power supply. It is simple to operate, easy to replace components, and easy to implement. It can be universally adapted with ordinary standard relays. Using standard common relays as detection units, when the relay is damaged, the phase loss detection function can be restored by simply unplugging the old relay and replacing it with a new one. It is convenient to use, saves time and effort, and greatly improves the efficiency of the entire phase loss detection operation. Moreover, the ordinary relays have a longer service life. Compared with conventional three-phase power supply monitoring devices, it is more adaptable to the operating environment and greatly reduces the detection cost.

[0023] This invention is lower in cost than conventional, expensive three-phase power supply testing equipment. The device has a simple structure, a significantly reduced failure rate, and is easy to maintain. It does not require highly specialized skills; the device can be quickly and easily repaired by simply plugging and unplugging relays. Furthermore, due to its simple structure, it can operate stably in harsh working environments.

[0024] The relay base provided by this utility model adopts an integrated design, which is simple, sturdy and not easily damaged; and adopts two installation methods, namely guide rail mounting fastener and guide rail slot, to realize the installation and use of the device, which is convenient for practical application;

[0025] The three-phase power supply terminals of this invention are located at one end of the relay base, and the working part terminals are located at the other end of the relay base. They are distributed on the upper and lower sides, which facilitates wiring and physically isolates the three-phase power supply terminals of the high-voltage part from the low-voltage terminals of the working part, thereby increasing safety.

[0026] The three-phase power supply (including the neutral wire N) involved in this utility model is both the object being tested and the object providing power to the equipment, so no additional power supply is required. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0028] Figure 1 This is a schematic diagram of the relay base structure of a phase loss detection device for a three-phase power supply provided in Embodiment 1 of this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a phase loss detection device for a three-phase power supply provided in Embodiment 1 of this utility model;

[0030] Figure 3 This is a circuit connection diagram of a phase loss detection device for a three-phase power supply provided in Embodiment 1 of this utility model.

[0031] The diagram is for illustrative purposes only.

[0032] The components are as follows: 1. General-purpose relay; 2. Mounting hole; 3. Power supply marking; 4. Three-phase power supply terminal; 5. Three-phase power supply terminal marking; 6. Relay pin socket; 7. Rail mounting bracket; 8. Relay base; 9. Working part terminal; 10. First phase internal shorting wire; 11. Second phase internal shorting wire; 12. Working part node; 13. First relay pin socket; 14. First relay coil; 15. First connecting wire; 16. First phase terminal; 17. Second phase terminal; 18. Third phase terminal; 19. Second relay neutral shorting wire; 20. Neutral wire terminal; 21. First relay; 22. Second relay; 23. Third relay. Detailed Implementation

[0033] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] Example 1

[0035] In a typical embodiment of this utility model, such as Figures 1-3 As shown, a phase loss detection device for a three-phase power supply is provided, including a relay base 8. One end of the relay base 8 is provided with a first phase AC terminal, a second phase AC terminal, a third phase AC terminal and a neutral terminal 20. The top of the relay base 8 is provided with a first relay 21, a second relay 22 and a third relay 23.

[0036] The first phase AC power terminal and the neutral terminal 20 are both connected to the coil of the first relay 21; the second phase AC power terminal is connected to the normally open contact of the first relay 21, the normally open contact of the first relay 21 is connected to the coil of the second relay 22, and the coil of the second relay 22 is connected to the neutral terminal 20; the third phase AC power terminal is connected to the normally open contact of the second relay 22, the normally open contact of the second relay 22 is connected to the coil of the third relay 23, and the coil of the third relay 23 is connected to the neutral terminal 20.

[0037] One end of the relay base 8 is also provided with a working part terminal 9.

[0038] In this embodiment, as Figure 1 As shown, the relay is a general-purpose relay 1. Two mounting holes 2 are provided on the upper part and diagonally opposite positions of the relay base 8 for mounting the relay base 8. A power indicator is provided on the relay base 8 to remind operators. Three three-phase power terminals 4 are provided on the left side of the relay base 8, spaced apart and each marked with a three-phase power terminal 5 for easy connection. Three relay pin sockets 6 are provided on the relay base 8 for inserting the first relay 21, the second relay 22, and the third relay 23 respectively. A guide rail mounting bracket 7 is provided at the bottom of the relay base 8 for mounting and using the relay base 8.

[0039] In this embodiment, as Figure 3 As shown, when using, connect the three-phase AC power supply lines to the three-phase power supply terminals 4 of the relay base according to the three-phase power supply terminal marking 5, and insert the three standard relays into the relay base from left to right.

[0040] The first relay 21, the second relay 22, and the third relay 23 are respectively inserted into the first relay pin socket 13, the second relay pin socket, and the third relay pin socket. The first phase power line is connected to the first phase terminal 16. The first phase terminal 16 is connected to the first relay coil 14 through the first connecting wire 15. The neutral wire also acts on the coil of the first relay 21. The second phase power line is connected to the second phase terminal 17. The second phase terminal 17 is connected to the normally open contact of the first relay 21 through the second connecting wire. The normally open contact inside the first relay 21 is connected to the coil of the second relay 22 through the first phase internal shorting wire 10. The coil of the second relay 22 is connected to the neutral wire through the second relay neutral wire shorting wire 19. The normally open contact inside the second relay 22 is connected to the coil of the third relay 23 through the second phase internal shorting wire 11. The third phase power line is connected to the third phase terminal 18. The third phase terminal 18 is connected to the normally open contact of the second relay 22 through the third connecting wire. The coil of the third relay 23 is connected to the neutral wire through the third relay 23 neutral wire shorting wire.

[0041] When the three-phase power supply is active, the first phase power line and the neutral line act on the coil of the first relay 21, causing the first relay 21 to engage and its normally open contact to close. At the same time, the second phase power line connects to the coil of the second relay 22 through the normally open contact of the first relay 21, and the second relay 22 engages under the influence of the neutral line. Similarly, the third phase power line connects to the coil of the third relay 23 through the normally open contact of the second relay 22, and the third relay 23 engages under the influence of the neutral line, thus completing the monitoring of the three-phase power supply. If any phase of the three-phase power supply is missing, the third relay 23 will not engage, and its normally open or normally closed contact switch will not operate, thereby achieving the purpose of monitoring for a phase loss in the three-phase power supply. If any of the three relays are damaged, they can be directly hot-swapped to replace them, restoring the detection function conveniently and quickly.

[0042] Furthermore, the first relay 21 is disposed on the relay base 8 near the first phase AC terminal, the first relay 21 is disposed on the relay base 8 away from the first phase AC terminal, and the second relay 22 is disposed on the relay base 8 away from the first relay 21, and the second relay 22 is disposed on the relay base 8 away from the first relay 21, and the third relay 23 is disposed on the relay base 8.

[0043] Furthermore, the relay base 8 is provided with multiple mounting holes 2. The phase loss detection device is installed at the working position through the multiple mounting holes 2 to ensure its stable use.

[0044] Furthermore, the relay base 8 is provided with a first relay pin socket 13, a second relay pin socket, and a third relay pin socket.

[0045] Furthermore, the first relay pin socket 13 is connected to the first relay 21, the second relay pin socket is connected to the second relay 22, and the third relay pin socket is connected to the third relay 23.

[0046] Furthermore, the first phase AC power terminal, the second phase AC power terminal, the third phase AC power terminal and the neutral terminal 20 are set at a certain distance apart.

[0047] In this embodiment, the relay base 8 is provided with four groove structures spaced at a certain distance. The first phase AC power terminal, the second phase AC power terminal, the third phase AC power terminal and the neutral wire terminal 20 are respectively arranged in the groove structures at a certain distance. This arrangement prevents interference during wiring.

[0048] Furthermore, a three-phase power indicator 3 is provided on the relay base 8 near the first phase AC terminal, the second phase AC terminal, the third phase AC terminal and the neutral terminal 20.

[0049] Furthermore, a first-phase AC power label is provided next to the first-phase AC power terminal, a second-phase AC power label is provided next to the second-phase AC power terminal, a third-phase AC power label is provided next to the third-phase AC power terminal, and a neutral wire label is provided next to the neutral wire terminal 20.

[0050] The three-phase power supply markings, the first phase AC marking, the second phase AC marking, the third phase AC marking, and the neutral wire marking help users quickly find the corresponding terminals for connection and use.

[0051] Furthermore, the working part terminal 9 is provided in multiple ways, and the multiple working part terminal 9 are respectively arranged on both sides of the relay base 8.

[0052] In this embodiment, as Figure 1 The working part has six terminals 9, the upper side of the relay base 8 has four terminals, and the lower side of the relay base 8 has two terminals. Vertically, it is divided into two groups of three terminals each. Figure 3 As shown, a, b, c, and d represent the four upper working part terminals 9, e and f represent the two lower working part terminals 9, and g and h connect the coil. The left side a, c, and e form one group, and the right side b, d, and f form another group.

[0053] By configuring the working part terminals 9 in this way, the functions of normally open contacts or normally closed contacts can be achieved through the two sets of terminals a, c, e or b, d, f respectively. That is, the functions of normally open contacts or normally closed contacts can be achieved by making different connections to a, c, e at the working part node 12. Similarly, the functions of normally open contacts or normally closed contacts can be achieved by making different connections to b, c, d. The third relay has the function of a standard relay. The two sets of working part terminals 9 can be connected to external signal lines for the detection of three-phase power supply, or they can also be used for audible and optical alarms.

[0054] Furthermore, the bottom of the relay base 8 is provided with a guide rail type mounting fastener 7 to achieve stable installation of the relay base 8.

[0055] The three-phase power supply phase loss detection device provided by this utility model can be universally adapted to ordinary standard relays. It uses standard common relays as detection units. When the relay is damaged, the phase loss detection function can be restored by simply unplugging the old relay and replacing it with a new one. It is convenient to use, saves time and effort, and greatly improves the efficiency of the entire phase loss detection operation. Moreover, the ordinary relay has a longer service life and is more adaptable to the operating environment than conventional three-phase power supply monitoring devices, and greatly reduces the detection cost.

[0056] In this embodiment, the internal circuitry of the device uses high-quality copper conductors, which have good conductivity and stable structure.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A phase loss detection device for a three-phase power supply, characterized in that, The relay includes a relay base, one end of which is provided with a first phase AC power terminal, a second phase AC power terminal, a third phase AC power terminal and a neutral wire terminal, and the top of the relay base is provided with a first relay, a second relay and a third relay; The first phase AC power terminal and the neutral terminal are both connected to the coil of the first relay; the second phase AC power terminal is connected to the normally open contact of the first relay, the normally open contact of the first relay is connected to the coil of the second relay, and the coil of the second relay is connected to the neutral terminal; the third phase AC power terminal is connected to the normally open contact of the second relay, the normally open contact of the second relay is connected to the coil of the third relay, and the coil of the third relay is connected to the neutral terminal. One end of the relay base is also provided with a working part terminal.

2. The phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The first relay is mounted on a relay base close to the first phase AC terminal, the second relay is mounted on a relay base away from the first phase AC terminal, and the third relay is mounted on a relay base away from the first relay.

3. The phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The relay base is provided with multiple mounting holes.

4. The phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The relay base is provided with a first relay pin socket, a second relay pin socket and a third relay pin socket.

5. A phase loss detection device for a three-phase power supply as described in claim 4, characterized in that, The first relay pin socket is connected to the first relay, the second relay pin socket is connected to the second relay, and the third relay pin socket is connected to the third relay.

6. A phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The first phase AC power terminal, the second phase AC power terminal, the third phase AC power terminal, and the neutral terminal are spaced at a certain distance.

7. A phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The relay base is equipped with a three-phase power supply indicator near the first phase AC power terminal, the second phase AC power terminal, the third phase AC power terminal, and the neutral terminal.

8. A phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The first phase AC terminal is marked with a first phase AC label, the second phase AC terminal is marked with a second phase AC label, the third phase AC terminal is marked with a third phase AC label, and the neutral terminal is marked with a neutral wire label.

9. A phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The working part has multiple terminals, which are respectively located on both sides of the relay base.

10. A phase loss detection device for a three-phase power supply as described in claim 1, characterized in that, The bottom of the relay base is equipped with a guide rail type mounting fastener.

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