A portable automatic phase sequence detection device

Abstract

The present invention discloses a portable automatic phase sequence detection device, which relates to the technical field of electric power devices. The automatic phase sequence detection system in the phase sequence detection device includes a phase sequence detection switch, a first power control relay, a second power control relay, a third power control relay, a fourth power control relay, a first relay, a same phase sequence indicator light, and a different phase sequence indicator light. The device first uses the power control relay to detect the phase sequence category of the three-phase power supply of different lines or different groups of transformers, and then compares the above phase sequence categories through the reverse connection of the power control relay, which can reliably detect whether the phase sequence of any low-voltage power supply is the same; it not only solves the problem of limited use range and low reliability of the automatic phase check device in the prior art, but also solves the problem of low safety and cumbersome operation of manual phase sequence detection, providing a guarantee for safe and rapid power supply of emergency equipment.

Description

Technical Field

[0001] The invention relates to an electric power device, in particular to a portable automatic phase sequence detection device. Background Art

[0002] With the development of economy, people have higher and higher requirements for the reliability of electricity use. In order to ensure that users do not have power outages, emergency power protection, power transmission, temporary power extraction and power supply are becoming more and more common. It has become the norm to use emergency equipment to supply or extract power to ensure the power needs of users. Common emergency equipment includes power generation vehicles, UPS power supply vehicles, mobile box transformers, low-voltage cable vehicles, etc.

[0003] At present, emergency equipment generally uses its own cable to directly connect to the low-voltage power grid interface for power supply. Since phase sequence detection is not performed before power supply, the output power phase sequence is often inconsistent with the user's power grid phase sequence, causing the user's three-phase equipment (such as elevators, lathes, etc.) to be unable to be used or to work in reverse, and may even cause accidents and endanger personal safety.

[0004] In order to avoid the occurrence of inconsistent phase sequence when emergency equipment is powered, the phase sequence must be checked before power is supplied. There are two existing methods for checking the phase sequence: one is to use a phase sequence meter for manual detection, and the other is to configure the emergency equipment with an automatic phase check device.

[0005] The first method: using a phase sequence meter, the advantage is that it requires less investment and is more applicable, but this method requires the operator to hold the phase sequence meter in contact with the 400V power supply, the operator's personal safety cannot be guaranteed, and the operation steps are cumbersome and the reliability is not high. Once the manual judgment is wrong, the consequences will be serious.

[0006] The second method: Generally, an automatic phase check device is installed inside the vehicle. Automatic phase check is generally implemented by carrying a simple generalized bridge or directly installing a phase check instrument. For example, the low-voltage phase check system of a bypass mobile box transformer repair vehicle disclosed in Chinese patent CN204330898U adopts the current balance principle and carries a generalized bridge to realize a low-voltage phase check system in its technical description. The system judges the phase situation by observing the current value by adjusting the adjustable resistor on site. It can be used to detect whether the three-phase power supply phases of the same group of transformers in the same line are the same, but it cannot detect whether the three-phase power supply phase sequence of different lines or different groups of transformers is consistent. It has large limitations in use and is not applicable to phase sequence detection of emergency equipment and low-voltage power grids. Moreover, the operation is complicated and the reliability of the results is not high. In addition, in the mobile box transformer vehicle with an automatic phase check system disclosed in Chinese patent CN201937193U, the mobile box transformer vehicle directly connects the low-voltage power supply and the power supply of the distribution transformer to the phase meter, and the phase meter judges the phase, realizing the automatic phase check and automatic switching of the mobile box transformer vehicle, avoiding on-site manual phase check and switching operations. However, since the phase meter can only detect the phase angle, that is to say, this phase verification method can only be used to determine whether the three-phase power supply phases of the same group of transformers in the same line are the same. The phase sequence of the three-phase power supply of different lines or different groups of transformers cannot be determined. It is also not applicable to phase sequence detection of emergency equipment and low-voltage power grids.

[0007] In addition, there are many types of interfaces in low-voltage power grids, the most common of which are low-voltage switchgear busbars, overhead lines, and various types of quick connectors. However, emergency equipment is generally only equipped with cables with one type of interface, which can only meet the interface requirements of a few low-voltage power grids, resulting in frequent inaccessibility of emergency equipment. In response to this situation, the existing solution is to modify the cables that come with emergency equipment on-site, which is not only time-consuming and labor-intensive, but also damages and wastes the cables that come with them. If multiple cable interfaces are configured, a large number of cables need to be configured, resulting in repeated purchase of cables and a waste of a lot of economic resources. The above problems have seriously restricted the development of emergency equipment, and at the same time, have had a huge impact on improving the reliability of electricity use.

[0008] Therefore, there is currently no known technology to solve the problem of automatic phase sequence detection and rapid access to the low-voltage distribution network for emergency equipment. Summary of the invention

[0009] In view of the above problems, the present invention discloses a portable automatic phase sequence detection device, which first uses a power control relay to detect the phase sequence categories of three-phase power supplies of different lines or different groups of transformers, and then compares the above phase sequence categories through the reverse connection of the power control relay, which can reliably detect whether the phase sequence of any low-voltage power supply is the same. It not only solves the problems of limited use range and low reliability of automatic phase checking devices in the prior art, but also solves the problems of low safety and cumbersome operation of manual phase sequence detection, providing a guarantee for safe and rapid power supply of emergency equipment.

[0010] A portable automatic phase sequence detection device is proposed according to the purpose of the present invention, comprising a box, a circuit breaker, a cable interface, an opening and closing switch and an automatic phase sequence detection system, wherein the automatic phase sequence detection system comprises a phase sequence detection switch, a first relay, an indicator light of the same phase sequence, an indicator light of different phase sequences and two groups of power control relays; each group of the power control relays has two, which are respectively connected to the input and output ends of the circuit breaker, and the two groups of power control relays are connected to the input and output ends of the circuit breaker in opposite phase sequences; a group of normally open contacts of the two power control relays in the same group are connected in series, and the two groups of power control relays are connected in parallel after being connected in series, and the coils of the first relay are respectively connected to the other ends of the normally open contacts of the two groups of power control relays connected in series; the first relay comprises two groups of normally open contacts and one group of normally closed contacts, one group of normally open contacts is connected to the indicator light of the same phase sequence, the other group is connected in series with the opening and closing switch, and one group of normally closed contacts is connected to the indicator light of different phase sequences.

[0011] Preferably, the two groups, four power control relays are respectively a first power control relay, a second power control relay, a third power control relay and a fourth power control relay; the power phases A, B and C of the first power control relay are connected to the A, B and C phases of the circuit breaker input terminals, the power phases A, B and C of the second power control relay are connected to the C, B and A phases of the circuit breaker input terminals, the power phases A, B and C of the third power control relay are connected to the A, B and C phases of the circuit breaker output terminals, and the power phases A, B and C of the fourth power control relay are connected to the C, B and A phases of the circuit breaker output terminals.

[0012] Preferably, the circuit breaker includes a circuit breaker body, a circuit breaker closing mechanism, and a circuit breaker opening mechanism, and the opening and closing switches are respectively connected to the circuit breaker closing mechanism and the circuit breaker opening mechanism. The cable interface is installed on both sides of the box body, including an input cable interface and an output cable interface, the input cable interface includes an input N-phase interface and an input A-phase interface, an input B-phase interface, and an input C-phase interface respectively connected to the A-phase, B-phase, and C-phase terminals of the circuit breaker input end; the output cable interface includes an output N-phase interface and an output A-phase interface, an output B-phase interface, and an output C-phase interface respectively connected to the A-phase, B-phase, and C-phase terminals of the circuit breaker output end, and the input N-phase interface is connected to the output N-phase interface.

[0013] Preferably, the input cable interface is a quick connector or a copper busbar, and the output cable interface is a quick connector; the cable interface is connected to the circuit breaker using a cable or a copper busbar.

[0014] Preferably, the output cable interface is connected to a switching cable, one end of the switching cable is a quick connector connected to the output cable interface, and the other end is configured with a variety of interface forms that can be compatible with various forms of interfaces of the low-voltage distribution network.

[0015] Preferably, the interface configured at one end of the adapter cable connected to the low-voltage distribution network is in the form of a copper terminal, a quick connector, or a drainage clamp.

[0016] Preferably, the device also includes a voltage and current display device, which includes a current signal detection device installed on the cable or copper busbar connected to the cable interface and the circuit breaker, and an electric power multi-function meter for displaying voltage, current, power and frequency.

[0017] Preferably, the device also includes a quasi-synchronous controller for comparing voltage amplitude and phase angle.

[0018] Preferably, the device also includes an electrical test port, which includes an input electrical test port and an output electrical test port, the input electrical test port is connected to the input end of the circuit breaker, the output electrical test port is connected to the output end of the circuit breaker, and the electrical test port has insulation protection and anti-electric shock structure.

[0019] Preferably, the box includes a box body, a handle, a door lock with a fingerprint recognition function and universal wheels, and the box body is a double-layer door structure.

[0020] Compared with the prior art, the advantages of the portable automatic phase sequence detection device disclosed in the present invention are:

[0021] (1) The present invention first uses a power control relay to detect the phase sequence category of the three-phase power supply of different lines or different groups of transformers, and then compares the above phase sequence categories through the reverse connection mode of the power control relay, which can reliably detect whether the phase sequence of any low-voltage power supply is the same. It not only solves the problem of the automatic phase check device in the prior art that can only detect whether the phase of the three-phase power supply of the same group of transformers in the same line is the same and the reliability, but also solves the problem of low safety and cumbersome operation of manual phase sequence detection, providing a guarantee for the safe and rapid power supply of emergency equipment.

[0022] (2) The present invention is provided with a cable interface and a transfer cable, so that the emergency equipment can be conveniently and quickly connected to the low-voltage power grid using its own cable, thereby solving the problems of on-site modification of emergency equipment cables and repeated purchase of cables, thus saving a lot of manpower and material resources.

[0023] (3) The three-phase power supply controller in the automatic phase sequence detection system of the present invention has phase loss protection and undervoltage protection functions. Only when the two power supplies at the input and output ends are completely normal and the phase sequence is consistent can the phase sequence consistency signal be output, which not only ensures the accuracy of the phase sequence detection result, but also ensures the reliability of the power supply for emergency equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a portable automatic phase sequence detection device disclosed in the present invention Figure 1 .

[0026] Figure 2 A schematic diagram of the structure of a portable automatic phase sequence detection device disclosed in the present invention Figure 2 .

[0027] Figure 3 The present invention discloses a circuit schematic diagram of a portable automatic phase sequence detection device.

[0028] Figure 4 The present invention discloses a logic block diagram of a portable automatic phase sequence detection device.

[0029] The numbers or letters in the figure represent the names of the parts:

[0030] 1-box; 101-universal wheel; 102-box body; 103-door lock; 104-handle; 2-circuit breaker; 201-circuit breaker body; 202-circuit breaker closing mechanism; 203-circuit breaker opening mechanism; 3-automatic phase sequence detection system; 301-first relay; 302-first power control relay; 303-second power control relay; 304-third power control relay; 305-fourth power control relay; 306-phase sequence detection switch; 307-phase sequence same indicator light; 308- different phase sequence indicator lights; 309- quasi-synchronous controller; 4- cable interface; 401- input A phase interface; 402- input B phase interface; 403- input C phase interface; 404- input N phase interface; 405- output A phase interface; 406- output B phase interface; 407- output C phase interface; 408- output N phase interface; 5- opening and closing switch; 6- voltage and current display device; 601- multi-function electric power meter; 602- current signal detection device; 7- electric test port; 8- adapter cable. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is briefly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Figure 1-Figure 4 The preferred embodiments of the present invention are shown and analyzed in detail from different perspectives.

[0033] like Figure 1 , 2 A portable automatic phase sequence detection device is shown, comprising a box 1, a circuit breaker 2, a cable interface 4, an opening and closing switch 5 and an automatic phase sequence detection system 3.

[0034] The box 1 includes a box body 102, a handle 104, a door lock 103 with a fingerprint recognition function, and a universal wheel 101. The box body 102 is a double-layer door structure, which effectively isolates the live parts of the automatic phase sequence detection and synchronization cable transfer box, avoiding the problem of operators accidentally touching the live parts and causing electric shock to the operators, and ensuring the safety of the operators when the emergency equipment is connected to the user. At the same time, since the universal wheel 101 and the handle 104 are installed at the bottom of the box 1 and the volume is small, it is easy to access and move, and can meet the space requirements of various working conditions.

[0035] The circuit breaker 2 is installed in the box 1, and includes a circuit breaker body 201, a circuit breaker closing mechanism 202, and a circuit breaker opening mechanism 203. The opening and closing switches 5 are respectively connected to the circuit breaker closing mechanism 202 and the circuit breaker opening mechanism 203.

[0036] The cable interface 4 is installed on both sides of the box 1, has insulation protection, and includes an input cable interface and an output cable interface. The input cable interface includes an input N-phase interface 404 and an input A-phase interface 401, an input B-phase interface 402, and an input C-phase interface 403 respectively connected to the A-phase, B-phase, and C-phase terminals of the input end of the circuit breaker 2. The output cable interface includes an output N-phase interface 408 and an output A-phase interface 405, an output B-phase interface 406, and an output C-phase interface 407 respectively connected to the A-phase, B-phase, and C-phase terminals of the output end of the circuit breaker 2. The input N-phase interface 404 is connected to the output N-phase interface 408. Specifically, the input cable interface is a quick connector or a copper busbar, and the output cable interface is a quick connector. The cable interface 4 is connected to the circuit breaker 2 by a cable or a copper busbar. The output cable interface is connected to a transfer cable 8, one end of which is a quick connector connected to the output cable interface, and the other end is configured with a variety of interface forms that can be matched with various forms of interfaces of the low-voltage distribution network. The specific interface form is a copper terminal or a quick connector or a drainage clamp.

[0037] like Figure 3 As shown, the automatic phase sequence detection system 3 includes a phase sequence detection switch 306, a first power control relay 302, a second power control relay 303, a third power control relay 304, a fourth power control relay 305, a first relay 301, a same phase sequence indicator light 307, and a different phase sequence indicator light 308. The power A phase, B phase, and C phase of the first power control relay 302 are respectively connected to the A phase, B phase, and C phase of the input terminal of the circuit breaker 2; the power A phase, B phase, and C phase of the second power control relay 303 are respectively connected to the C phase, B phase, and A phase of the input terminal of the circuit breaker 2; the power A phase, B phase, and C phase of the third power control relay 304 are respectively connected to the A phase, B phase, and C phase of the output terminal of the circuit breaker 2; the power A phase, B phase, and C phase of the fourth power control relay 305 are respectively connected to the C phase, B phase, and A phase of the output terminal of the circuit breaker 2. A group of normally open contacts of the first power control relay 302 is connected in series with a group of normally open contacts of the third power control relay 304, a group of normally open contacts of the second power control relay 303 is connected in series with a group of normally open contacts of the fourth power control relay 304, and the two groups of power control relays are connected in series and then connected in parallel as a whole, and the coil of the first relay 301 is respectively connected to the other end of the normally open contacts of the third power control relay 304 and the other end of the normally open contacts of the fourth power control relay 305. The first relay 301 includes two groups of normally open contacts and one group of normally closed contacts, one group of normally open contacts is connected to the indicator light 307 with the same phase sequence, the other group is connected in series with the opening and closing switch 5, and one group of normally closed contacts is connected to the indicator light 308 with different phase sequence.

[0038] Furthermore, the device also includes a voltage and current display device 6, which includes a current signal detection device 602 installed on the cable or copper busbar connected to the cable interface 4 and the circuit breaker 2, and an electric multi-function meter 601 for displaying voltage, current, power, and frequency.

[0039] Furthermore, the device also includes a quasi-synchronous controller 309 for comparing voltage amplitude and phase angle, which provides conditions for the mobile box transformer and low-voltage cable car to run in parallel with users, greatly improving the power supply reliability.

[0040] Furthermore, the device also includes an electrical test port 7, which includes an input electrical test port and an output electrical test port. The input electrical test port is connected to the input end of the circuit breaker 2, and the output electrical test port is connected to the output end of the circuit breaker 2. The electrical test port 7 has insulation protection and an anti-electric shock structure.

[0041] like Figure 4 As shown, the portable automatic phase sequence detection device is used to perform the operation, including the following steps:

[0042] (1) Connect the cable of the emergency equipment to the input cable interface of the portable automatic phase sequence detection device. Connect one end of the adapter cable 8 to the output cable interface of the portable automatic phase sequence detection device, and the other end to the low-voltage power grid.

[0043] (2) Press the phase sequence switch 306, and the automatic phase sequence system 3 starts working.

[0044] (3) If the power supplies of the input cable interface and the output cable interface are both in positive phase sequence, the first power control relay 302 and the third power control relay 304 are activated, and the corresponding normally open contacts are closed. At this time, the phase sequence is the same, the first relay 301 is energized and activated, the phase sequence same indicator light 307 works, and the circuit breaker 2 is allowed to close. Operate the opening and closing switch 5, the circuit breaker closing mechanism 202 is energized and activated, the circuit breaker 2 is closed, and the power supply of the emergency equipment is transmitted to the low-voltage distribution network;

[0045] If the input cable interface power supply is in positive phase sequence and the output cable interface power supply is in negative phase sequence, the first power control relay 302 and the fourth power control relay 305 are activated, and the corresponding normally open contacts are closed. At this time, the phase sequence is different, the first relay 301 does not operate, the phase sequence different indicator light 308 works, and the circuit breaker 2 is prohibited from closing. At this time, swap any two phases of the end of the transfer cable 8 connected to the output cable interface, and re-check the phase sequence automatically;

[0046] If the input cable interface power supply is in reverse phase sequence and the output cable interface power supply is in positive phase sequence, the second power supply control relay 303 and the third power supply control relay 304 are activated, and the corresponding normally open contacts are closed. At this time, the phase sequence is different, the first relay 301 does not operate, the phase sequence different indicator light 308 works, and the circuit breaker 2 is prohibited from closing. At this time, swap any two phases of the end of the transfer cable 8 connected to the output cable interface, and re-check the phase sequence automatically;

[0047] If the power supply of the input cable interface and the output cable interface are both in reverse phase sequence, the second power supply control relay 303 and the fourth power supply control relay 305 are activated, and the corresponding normally open contacts are closed. At this time, the phase sequence is the same, the first relay 301 is energized and activated, the phase sequence is the same indicator light 307 is on, and the circuit breaker 2 is allowed to close. Operate the opening and closing switch 5, the circuit breaker closing mechanism 202 is energized and activated, the circuit breaker 2 is closed, and the emergency equipment power is transmitted to the low-voltage distribution network.

[0048] In summary, the present invention discloses a portable automatic phase sequence detection device, which first uses a power control relay to detect the phase sequence category of the three-phase power supply of different lines or different groups of transformers, and then compares the above phase sequence categories through the reverse connection method of the power control relay, so as to reliably detect whether the phase sequence of any low-voltage power supply is the same. It not only solves the problem of the reliability that the automatic phase check device in the prior art can only detect whether the phase of the three-phase power supply of the same group of transformers in the same line is the same, but also solves the problem of low safety and cumbersome operation of manual phase sequence detection, and provides a guarantee for the safe and rapid power supply of emergency equipment. At the same time, the phase sequence detection device is also provided with a cable interface and a transfer cable, so that the emergency equipment can be conveniently and quickly connected to the low-voltage power grid using its own cable, which solves the problem of on-site modification of emergency equipment cables and repeated purchase of cables, saving a lot of manpower and material resources.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement and use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit and scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A portable automatic phase sequence detection device, comprising a box (1), a circuit breaker (2), a cable interface (4), an opening and closing switch (5) and an automatic phase sequence detection system (3), characterized in that: The automatic phase sequence detection system (3) comprises a phase sequence detection switch (306), a first relay (301), an indicator light for the same phase sequence (307), an indicator light for different phase sequences (308), and two groups of power control relays; each group of the power control relays comprises two, which are respectively connected to the input end and the output end of the circuit breaker (2); the two groups of power control relays are connected to the input end and the output end of the circuit breaker (2) in opposite phase sequences; one group of normally open contacts of the two power control relays in the same group are connected in series, and the two groups of power control relays are connected in parallel after being connected in series, and the coils of the first relay (301) are respectively connected to the other ends of the normally open contacts of the two groups of power control relays connected in series; the first relay (301) comprises two groups of normally open contacts and one group of normally closed contacts, one group of which is connected to the indicator light for the same phase sequence (307), the other group is connected in series to the opening and closing switch (5), and one group of which is connected to the indicator light for the different phase sequence (308); the circuit breaker (2) is installed in a box (1); The power control relays are respectively a first power control relay (302), a second power control relay (303), a third power control relay (304) and a fourth power control relay (305); the power phases A, B and C of the first power control relay (302) are connected to the input terminals A, B and C of the circuit breaker (2); the power phases A, B and C of the second power control relay (303) are connected to the input terminals C, B and A of the circuit breaker (2); the power phases A, B and C of the third power control relay (304) are connected to the output terminals A, B and C of the circuit breaker (2); and the power phases A, B and C of the fourth power control relay (305) are connected to the output terminals C, B and A of the circuit breaker (2).

2. A portable automatic phase sequence detection device according to claim 1, characterized in that: The circuit breaker (2) comprises a circuit breaker body (201), a circuit breaker closing mechanism (202), and a circuit breaker opening mechanism (203); the opening and closing switches (5) are respectively connected to the circuit breaker closing mechanism (202) and the circuit breaker opening mechanism (203); the cable interface (4) is installed on both sides of the box (1), and comprises an input cable interface and an output cable interface; the input cable interface comprises an input N-phase interface (404) and an output cable interface (405) respectively connected to the input terminal A of the circuit breaker (2). The output cable interface comprises an output N-phase interface (408) and an output A-phase interface (405), an output B-phase interface (406), and an output C-phase interface (403) respectively connected to the A-phase, B-phase, and C-phase terminals of the output end of the circuit breaker (2); the input N-phase interface (404) is connected to the output N-phase interface (408).

3. A portable automatic phase sequence detection device according to claim 2, characterized in that: The input cable interface is a quick connector or a copper busbar, and the output cable interface is a quick connector; the cable interface (4) is connected to the circuit breaker (2) by a cable or a copper busbar.

4. A portable automatic phase sequence detection device according to claim 3, characterized in that: The output cable interface is connected to a switching cable (8), one end of the switching cable (8) is a quick connector connected to the output cable interface, and the other end is configured with a variety of interface forms that can be matched with various forms of interfaces of the low-voltage distribution network.

5. A portable automatic phase sequence detection device according to claim 4, characterized in that: The interface configured at one end of the transfer cable (8) connected to the low-voltage distribution network is in the form of a copper terminal, a quick connector or a drainage clamp.

6. A portable automatic phase sequence detection device according to claim 1, characterized in that: The device also includes a voltage and current display device (6), which includes a current signal detection device (602) installed on a cable or copper busbar connected to the cable interface (4) and the circuit breaker (2), and an electric power multifunctional meter (601) for displaying voltage, current, power, and frequency.

7. A portable automatic phase sequence detection device according to claim 1, characterized in that: The device also includes a quasi-synchronous controller (309) for comparing voltage amplitude and phase angle.

8. A portable automatic phase sequence detection device according to claim 1, characterized in that: The device further comprises an electrical test port (7), the electrical test port (7) comprising an input electrical test port and an output electrical test port, the input electrical test port being connected to the input end of the circuit breaker (2), the output electrical test port being connected to the output end of the circuit breaker (2), and the electrical test port (7) having insulation protection and an anti-electric shock structure.

9. A portable automatic phase sequence detection device according to claim 1, characterized in that: The box (1) comprises a box body (102), a handle (104), a door lock (103) with a fingerprint recognition function, and a universal wheel (101); the box body (102) is a double-layer door structure.

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