Portable power supply phase sequence checking circuit

Abstract

The utility model discloses a portable power supply phase sequence checking circuit which comprises a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, a first resistor, a second resistor, a third resistor, a first alligator clip wire, a second alligator clip wire and a third alligator clip wire. One end of the first alligator clip wire is connected with the cathode of the first light-emitting diode and the cathode of the third light-emitting diode, the anode of the first light-emitting diode is connected with one end of the first resistor, and the anode of the third light-emitting diode is connected with one end of the third resistor; one end of the second alligator clip wire is connected with the other end of the first resistor and the cathode of the second light-emitting diode; the anode of the second light-emitting diode is connected with one end of the second resistor; one end of the third alligator clip wire is connected with the other end of the second resistor and the other end of the third resistor. According to the utility model, a lot of working time can be saved, working efficiency is effectively improved, and personal safety and equipment safety are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of line maintenance, in particular to a portable power supply phase sequence checking circuit. Background Art

[0002] At present, the cable joints in street lamp wells are all installed with waterproof insulation boxes and are in a closed state. In addition, the space of the street lamp inspection port is small, and the phase sequence and voltage of the power supply line cannot be intuitively identified during maintenance.

[0003] When restoring the line, it is necessary to determine the phase sequence for installation. At the same time, when checking the line, it was found that the construction party mixed the neutral line and the ground line of most street lamp power lines. This wiring method will cause the equipment to be energized in places that should not be energized, posing a safety hazard. The above situation consumes a lot of manpower and time during work, so this solution is proposed, which can quickly identify the phase sequence of the street lamp power line and ensure the correctness of the line installation during maintenance, acceptance and other work, and prevent the neutral and ground lines from being connected in reverse during wiring. It can quickly identify the live wire, neutral wire, and ground wire and determine whether there is a phase loss. At the same time, it can be determined based on the displayed voltage whether it is a problem on the incoming power supply side or a problem with the terminal equipment or line. Summary of the invention

[0004] The technical problem to be solved by the utility model is to solve the deficiencies of the prior art, specifically to solve the problems of mixing or reverse connection of the neutral wire and the ground wire of the power supply line, quickly identifying the live wire, the neutral wire, and the ground wire and determining whether there is a phase loss, and specifically provide a portable power supply phase sequence detection circuit, as follows:

[0005] The utility model provides a portable power supply phase sequence detection circuit, and the specific technical scheme is as follows:

[0006] It includes a first light emitting diode LED1, a second light emitting diode LED2, a third light emitting diode LED3, a first resistor R1, a second resistor R2, a third resistor R3, a first alligator clip wire LINE1, a second alligator clip wire LINE2 and a third alligator clip wire LINE3;

[0007] One end of the first crocodile clip wire LINE1 is connected to the cathode of the first light-emitting diode LED1 and the cathode of the third light-emitting diode LED3, the anode of the first light-emitting diode LED1 is connected to one end of the first resistor R1, and the anode of the third light-emitting diode LED3 is connected to one end of the third resistor R3; one end of the second crocodile clip wire LINE2 is connected to the other end of the first resistor R1 and the cathode of the second light-emitting diode LED2, and the anode of the second light-emitting diode LED2 is connected to one end of the second resistor R2; one end of the third crocodile clip wire LINE3 is connected to the other end of the second resistor R2 and the other end of the third resistor R3.

[0008] The beneficial effects of a portable power phase sequence detection circuit provided by the utility model are as follows:

[0009] The utility model is simple, clear, intelligent and portable.

[0010] On the basis of the above scheme, the present invention can also be improved as follows.

[0011] Furthermore, a first rectifier U1 is further included between the other end of the first resistor R1 and one end of the second alligator clip wire LINE2.

[0012] Furthermore, a second rectifier U2 is further included between the other end of the second resistor R2 and one end of the third alligator clip wire LINE3.

[0013] Furthermore, a third rectifier U3 is further provided between the other end of the third resistor R3 and one end of the third alligator clip wire LINE3.

[0014] Furthermore, the other end of the first alligator clip wire LINE1 is connected to the ground wire, the other end of the second alligator clip wire LINE2 is connected to the neutral wire, and the other end of the third alligator clip wire LINE3 is connected to the live wire.

[0015] Furthermore, the circuit further comprises a voltage display V, one end of the voltage display V is connected to one end of the second alligator clip wire LINE2, and the other end of the voltage display V is connected to one end of the third alligator clip wire LINE3.

[0016] The beneficial effects of adopting the above improvements are as follows:

[0017] The voltage display is easy to install and displays the voltage intuitively, thus affecting the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 A schematic diagram of a portable power supply phase sequence detection circuit according to an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of a working device of an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of a working site of an embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, a portable power phase sequence detection circuit of an embodiment of the utility model includes: a first light emitting diode LED1, a second light emitting diode LED2, a third light emitting diode LED3, a first resistor R1, a second resistor R2, a third resistor R3, a first alligator clip wire LINE1, a second alligator clip wire LINE2 and a third alligator clip wire LINE3;

[0024] One end of the first crocodile clip wire LINE1 is connected to the cathode of the first light-emitting diode LED1 and the cathode of the third light-emitting diode LED3, the anode of the first light-emitting diode LED1 is connected to one end of the first resistor R1, and the anode of the third light-emitting diode LED3 is connected to one end of the third resistor R3; one end of the second crocodile clip wire LINE2 is connected to the other end of the first resistor R1 and the cathode of the second light-emitting diode LED2, and the anode of the second light-emitting diode LED2 is connected to one end of the second resistor R2; one end of the third crocodile clip wire LINE3 is connected to the other end of the second resistor R2 and the other end of the third resistor R3.

[0025] The components in the circuit are described as follows:

[0026] (1) Light-emitting diode: When the diode is turned on, the LED indicator lights up, otherwise it goes out; the light-emitting diode can use 3 LED lights;

[0027] (2) Resistors: They have a current limiting function. To ensure that the current passing through the appliance does not exceed the rated value or specified value required for actual operation, the appliance can work normally. A 200KΩ resistor can be used as the current limiting resistor for the LED.

[0028] (3) Alligator clip wire: It is safe and convenient to use and is used as a temporary connection for the wiring terminals at the inspection port of street lights. It has the advantages of small size, light weight, smooth movement, and flexible and convenient operation. Alligator clip wires can be medium-sized alligator clip wires with insulating sleeves.

[0029] Optionally, a first rectifier U1 is further included between the other end of the first resistor R1 and one end of the second alligator clip wire LINE2.

[0030] Optionally, a second rectifier U2 is further included between the other end of the second resistor R2 and one end of the third alligator clip wire LINE3.

[0031] Optionally, a third rectifier U3 is further included between the other end of the third resistor R3 and one end of the third alligator clip wire LINE3.

[0032] Among them, the rectifier can use 3 1N4007 diodes. The function of the rectifier is to convert AC power into DC power and supply it to the resistor after filtering.

[0033] Optionally, the other end of the first alligator clip wire LINE1 is connected to the ground wire, the other end of the second alligator clip wire LINE2 is connected to the neutral wire, and the other end of the third alligator clip wire LINE3 is connected to the live wire.

[0034] Optionally, the circuit also includes a voltage display V, one end of the voltage display V is connected to one end of the second alligator clip wire LINE2, and the other end of the voltage display V is connected to one end of the third alligator clip wire LINE3. The voltage display can be an LED AC digital display voltmeter.

[0035] Among them, the function of the voltage display is to determine whether the voltage is too high or too low. The voltage display is easy to install and displays the voltage intuitively, thus affecting the service life of the equipment.

[0036] When performing phase sequence identification and voltage detection on a street lamp circuit, a light emitting diode, a resistor, a rectifier, and a voltage display are assembled into a circuit board according to a circuit logic schematic diagram, and the circuit board is assembled in a distribution box, which may be a distribution box with an insulating shell. The other end of the first alligator clip wire LINE1 is connected to the ground wire of the circuit to be tested, the other end of the second alligator clip wire LINE2 is connected to the neutral wire of the circuit to be tested, and the other end of the third alligator clip wire LINE3 is connected to the live wire of the circuit to be tested. The light emitting state of the diode is checked to determine whether the phase sequence of the street lamp circuit is correct, the on-load measurement voltage of the voltage display is checked to determine the health of the circuit, and whether the circuit has a virtual connection according to the on-load measurement voltage, such as Figure 2 as well as Figure 3 .

[0037] When the phase sequence checker is connected to the street lamp power supply line, the following situations may occur:

[0038] (1) When the second light-emitting diode LED2 and the third light-emitting diode LED3 are lit, it indicates that the live wire, the neutral wire and the ground wire of the street lamp power supply are correctly connected. At this time, AC220V passes through the second rectifier U2, the second resistor R2 and the third rectifier U3, the third resistor R3 respectively;

[0039] (2) When the second light-emitting diode LED2 lights up, it indicates that the ground wire is leaking. At this time, AC220V passes through the second rectifier U2 and the second resistor R2;

[0040] (3) When the first light-emitting diode LED1 and the second light-emitting diode LED2 are lit, it indicates that the neutral line and the live line are connected incorrectly. At this time, AC220V passes through the first rectifier U1 and the first resistor R1 and the second rectifier U2 and the second resistor R2 respectively. It can be understood that at this time, the current in the live line is alternating current. When the alternating current passes through the second light-emitting diode LED2, it first passes through the negative electrode of the second light-emitting diode LED2. The alternating current is a current that fluctuates at 50Hz in positive and negative directions. The negative current will pass through the second light-emitting diode LED2 to make the second light-emitting diode LED2 emit light. In essence, the second light-emitting diode LED2 will flash at the same frequency of 50Hz as the alternating current passing through it. However, the second light-emitting diode LED2 that emits light at this frequency is equivalent to being always on for the intuitive perception of the human eye. Therefore, when the first light-emitting diode LED1 and the second light-emitting diode LED2 are lit, it indicates that the neutral line and the live line are connected incorrectly.

[0041] (4) When the third light-emitting diode LED3 lights up, it indicates that the neutral line is missing. At this time, AC220V passes through the third rectifier U3 and the third resistor R3. It can be understood that at this time, the neutral line is equivalent to a circuit breaker. The current passes through the first branch (the branch where the third light-emitting diode LED3 is located) and the second branch (the branch formed by the first light-emitting diode LED1 and the second light-emitting diode LED2 in series) from the live line. At this time, the first branch and the second branch are in parallel. The first resistor R1 and the second resistor R2 are connected in series on the second branch. The resistor 400KΩ is regarded as infinite, so the current passing through the second branch is regarded as infinitesimal. Therefore, the first light-emitting diode LED1 and the second light-emitting diode LED2 are not lit. When the third light-emitting diode LED3 lights up, it indicates that the neutral line is missing.

[0042] (5) When the first light-emitting diode LED1, the second light-emitting diode LED2 and the third light-emitting diode LED3 are all not lit, it means that the live wire is missing. At this time, the live wire cannot provide AC220V, and there is no current in the entire circuit;

[0043] (6) When the first light-emitting diode LED1 and the third light-emitting diode LED3 are lit, it indicates that the live wire and the ground wire are connected incorrectly. At this time, AC220V passes through the first rectifier U1, the first resistor R1 and the third rectifier U3, the third resistor R3 respectively. It can be understood that at this time, the current in the live wire is alternating current. When the alternating current passes through the first light-emitting diode LED1 and the third light-emitting diode LED3 respectively, the first light-emitting diode LED1 and the third light-emitting diode LED3 are connected in parallel, and first pass through the negative electrodes of the first light-emitting diode LED1 and the third light-emitting diode LED3. The alternating current is a current that fluctuates in positive and negative directions at 50Hz. The negative current will pass through the first light-emitting diode LED1 and the third light-emitting diode LED3 respectively, causing the first light-emitting diode LED1 and the third light-emitting diode LED3 to emit light respectively. In the same situation (3), the first light-emitting diode LED1 and the third light-emitting diode LED3 will essentially flash at the same frequency of 50 Hz as the AC current passing through them. However, the first light-emitting diode LED1 and the third light-emitting diode LED3 emitting light at this frequency are equivalent to being always on for the intuitive perception of the human eye. Therefore, when the first light-emitting diode LED1 and the third light-emitting diode LED3 are on, it indicates that the live wire and the ground wire are connected incorrectly.

[0044] Optionally, when the wiring is correct, the voltage can be measured with load according to the voltage display to determine the health of the circuit. If the measured voltage is low, it means that there is a virtual connection in the line. It is easy to think that when the voltage is measured with load and without load under the condition of correct wiring, when the voltage is lower than 200V or the difference between the voltage measured with load and the voltage measured without load is too large, it can be considered that there is a virtual connection in the line.

[0045] The beneficial effects of a portable power phase sequence detection circuit provided by the utility model are as follows:

[0046] When confirming the phase sequence of lines in the street light inspection port and other lines, it is necessary to dismantle the insulating waterproof box of the cable joint in the street light well, which takes about 30 minutes to complete. Using this device, the phase sequence and voltage can be directly confirmed at the street light inspection port, which can save 25 minutes of working time.

[0047] The utility model has the characteristics of rapid phase sequence identification, smart portability, and labor saving. It is very practical in the installation, maintenance, and acceptance of outdoor street lamp lines. The phase sequence and voltage can be directly confirmed at the inspection port, which can save a lot of working time and effectively improve work efficiency. It can also be used in later new business, acceptance and other work, laying a safety foundation for later power work and effectively ensuring personal safety and equipment safety.

[0048] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A portable power supply phase sequence detection circuit, characterized in that: include: A first light emitting diode, a second light emitting diode, a third light emitting diode, a first resistor, a second resistor, a third resistor, a first alligator clip wire, a second alligator clip wire, and a third alligator clip wire; One end of the first alligator clip wire is connected to the cathode of the first light-emitting diode and the cathode of the third light-emitting diode, the anode of the first light-emitting diode is connected to one end of the first resistor, and the anode of the third light-emitting diode is connected to one end of the third resistor; one end of the second alligator clip wire is connected to the other end of the first resistor and the cathode of the second light-emitting diode, and the anode of the second light-emitting diode is connected to one end of the second resistor; one end of the third alligator clip wire is connected to the other end of the second resistor and the other end of the third resistor.

2. A portable power supply phase sequence detection circuit according to claim 1, characterized in that: A first rectifier is also included between the other end of the first resistor and one end of the second alligator clip wire.

3. A portable power supply phase sequence detection circuit according to claim 1, characterized in that: A second rectifier is also included between the other end of the second resistor and one end of the third alligator clip wire.

4. A portable power supply phase sequence detection circuit according to claim 1, characterized in that: A third rectifier is also included between the other end of the third resistor and one end of the third alligator clip wire.

5. A portable power supply phase sequence detection circuit according to claim 1, characterized in that: The other end of the first alligator clip wire is connected to the ground wire, the other end of the second alligator clip wire is connected to the neutral wire, and the other end of the third alligator clip wire is connected to the live wire.

6. A portable power phase sequence detection circuit according to claim 1, characterized in that: The circuit also includes a voltage display, one end of which is connected to one end of the second alligator clip wire, and the other end of which is connected to one end of the third alligator clip wire.

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