Multifunctional low-voltage switch cabinet

Abstract

A multifunctional low-voltage switch cabinet belongs to the technical field of switch cabinets and comprises a low-voltage switch cabinet body, a current transformer, a storage battery, a power socket, a power plug, a shell, a rectifying circuit, a temperature detection circuit, an electric leakage detection circuit and an opening detection circuit. An LED matched with the electric leakage detection circuit is mounted at the front side end of a cabinet door of the low-voltage switch cabinet body; one phase line of the circuit breaker passes through the current transformer hole; the storage battery, the power socket, the rectifying circuit, the temperature detection circuit, the electric leakage detection circuit and the opening detection circuit are installed in the shell and electrically connected, the rear end of the shell is attracted to the front end of the circuit breaker shell through a magnet, and the opening detection circuit is matched with a photoelectric switch to be installed on the front outer side of the shell. The shell and the fixed shell can be conveniently taken down, and application is more convenient; when the cabinet body leaks electricity, the temperature exceeds the standard and the circuit breaker is closed, related workers can be prompted to process in time, fault expansion of related electrical equipment is reduced, and work of the electrical equipment can be recovered in time.

Description

Technical Field

[0001] This utility model relates to the field of switchgear equipment technology, and in particular to a multifunctional low-voltage switchgear. Background Technology

[0002] Low-voltage switchgear, also known as low-voltage distribution cabinet, is a complete set of electrical equipment used in the low-voltage distribution section of a power system. It is mainly installed in the distribution room and includes terminals, various knife switches, protection devices (such as air switches and fuses), measuring devices (such as voltmeters and ammeters), and metering devices (such as active and reactive power meters), etc., for the conversion and control of electrical energy for power, lighting, and distribution.

[0003] With the development of industrial technology, the technology of low-voltage switchgear has also advanced. my country's authorized patent, patent number "201320769791.5," entitled "Heat Dissipation Switchgear," describes it as "easy to move, rainproof, extending the service life of the switchgear enclosure, and the temperature inside the enclosure can be adjusted, ensuring the normal operation of electronic components." As can be seen, although the patent achieves the described technological effects to some extent, it still suffers from the following technical problems due to structural and functional limitations, similar to existing low-voltage switchgear. Specifically, it lacks temperature and leakage current monitoring functions. This means that when internal electrical components overheat or leak due to various reasons, the system cannot promptly alert personnel, increasing the risk of escalating internal electrical component failures and electric shock. Furthermore, it lacks an internal circuit breaker closing indication function. Therefore, when the circuit breaker stops outputting power for various reasons, personnel are unaware and cannot restore power in time, adversely affecting the normal operation of equipment powered by the switchgear. For these reasons, existing switchgear still has considerable room for technological improvement. Utility Model Content

[0004] To overcome the shortcomings of existing low-voltage switchgear due to structural limitations, as described in the background, this utility model provides a multi-functional low-voltage switchgear based on the switchgear body. In application, under the combined action of relevant mechanisms, and through the coordinated power supply of a current transformer and battery, it can monitor in real time whether the temperature inside the cabinet exceeds the standard and whether there is leakage. It can also monitor whether the circuit breaker is closed in real time via photoelectric switches. When there is leakage in the cabinet, it can visually alert the workers on an LED display screen, reducing the chance of electric shock. Furthermore, when the temperature exceeds the standard or the circuit breaker is closed, it can promptly alert relevant personnel to take timely action, reducing the escalation of electrical equipment failures and enabling timely restoration of equipment operation.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A multifunctional low-voltage switchgear includes a switchgear body, a current transformer, a battery, a power socket, a power plug, and a housing. It also includes a rectifier circuit, a temperature detection circuit, a leakage current detection circuit, and a tripping detection circuit. The leakage current detection circuit is equipped with an LED display screen, which is installed on the front side of the switchgear body's door. The current transformer is installed on the upper part of the circuit breaker housing inside the switchgear body, with one phase wire of the circuit breaker passing through the center hole of the current transformer. The battery, power socket, rectifier circuit, temperature detection circuit, leakage current detection circuit, and tripping detection circuit are installed inside the housing. A magnet is installed on the rear outer end of the housing, and a suction plate is installed on the front end of the circuit breaker housing. The rear end of the housing is attracted by the magnet. The front end of the suction plate; the trip detection circuit is equipped with a photoelectric switch, which is horizontally installed on the front outer side of the housing. The two power output terminals of the current transformer and the two terminals of the first power plug are electrically connected. The power input terminal of the rectifier circuit and the two terminals of the first power socket are electrically connected. The power output terminal of the rectifier circuit is electrically connected to the two poles of the battery and the power input terminals of the temperature detection circuit, leakage detection circuit, and trip detection circuit. The signal input terminal of the trip detection circuit and the signal output terminal of the temperature detection circuit are electrically connected. The power input terminal of the LED display screen and the two terminals of the second power plug are electrically connected. The power output terminal of the leakage detection circuit and the two terminals of the second power socket are electrically connected.

[0007] Furthermore, the plugs of the first power plug and the second power plug are inserted into the sockets of the first power socket and the second power socket, respectively.

[0008] Furthermore, the rear side of the probe of the photoelectric switch is positioned forward of the lower end of the operating handle of the circuit breaker.

[0009] Furthermore, the rectifier circuit includes a bridge rectifier and a capacitor that are electrically connected, with the power output terminal of the bridge rectifier and the capacitor respectively connected.

[0010] Furthermore, the temperature detection circuit includes an electrically connected thermistor and resistor, an adjustable resistor, and a transistor. The heated surface of the thermistor is located outside the opening in the outer casing. One end of the thermistor is connected to the emitter of the first transistor, and the other end of the thermistor is connected to one end of the adjustable resistor and one end of the resistor. The other end of the resistor is connected to the base of the second transistor, the collector of the second transistor is connected to the base of the first transistor, and the other end of the adjustable resistor is connected to the emitter of the second transistor.

[0011] Furthermore, the leakage detection circuit includes an electrically connected resistor and a thyristor, a fixed shell, and a metal block. The resistor and the thyristor are installed inside the shell. The lower end of the fixed shell has an open structure, and a magnet is installed on the inner side of the lower end. The metal block is installed inside the magnet piece, and the metal block, the magnet piece, and the lower end of the fixed shell are on the same plane. The metal block is connected to one end of the resistor, and the other end of the resistor is connected to the control electrode of the thyristor.

[0012] Furthermore, the trip detection circuit includes an electrically connected resistor, a thyristor, a buzzer, and a photoelectric switch. The anode of the thyristor is connected to the positive power input terminal of the photoelectric switch. The power output terminal of the photoelectric switch is connected to one end of the resistor, and the other end of the resistor is connected to the control electrode of the thyristor. The cathode of the thyristor is connected to the positive power input terminal of the buzzer, and the negative power input terminal of the photoelectric switch is connected to the negative power input terminal of the buzzer.

[0013] Compared with existing technologies, the advantages of this utility model are as follows: Based on a low-voltage switchgear body, this new model uses a current transformer in conjunction with a battery for power supply, eliminating the need for an external power source to charge the battery. Since the outer casing and the mounting shell are magnetically attached to the front end of the circuit breaker and the inner end of the switchgear body respectively, the outer casing and mounting shell can be easily removed for maintenance of internal components, making it more convenient to use. During operation, it can monitor the internal temperature of the cabinet in real time to detect overheating and leakage. It can also monitor the circuit breaker's closure in real time via photoelectric switches. In case of leakage, the LED display screen provides a direct warning to workers, reducing the risk of electric shock. Furthermore, when the temperature exceeds the limit or the circuit breaker closes, an audible alarm promptly alerts relevant personnel to take timely action, reducing the escalation of electrical equipment failures and allowing for timely restoration of operation of equipment powered by the switchgear body. In summary, this new model has promising application prospects. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 , 3 It is a partial structural diagram of the utility model.

[0017] Figure 4 This is the circuit diagram of this utility model. Detailed Implementation

[0018] Figure 1 , 2As shown in Figures 3 and 4, a multifunctional low-voltage switchgear includes a low-voltage switchgear body 1, a current transformer T, a battery G1, a power socket, a power plug, and a housing 2. It also includes a rectifier circuit 3, a temperature detection circuit 4, a leakage current detection circuit 5, and a tripping detection circuit 6. The leakage current detection circuit is equipped with an LED display screen, which is installed on the upper inner side of the front door of the low-voltage switchgear body 1, with the display surface located on the outer front side of the door. The current transformer T is installed on the upper end of the circuit breaker 7 housing inside the switchgear body, and one phase wire of the circuit breaker 7 passes through the current transformer T. The center hole passes through; the battery G1, power socket, rectifier circuit 3, temperature detection circuit 4, leakage current detection circuit 5, and trip detection circuit 6 are installed on the circuit board inside the housing 2. A permanent magnet 21 is glued to the rear outer side of the housing 2. A steel suction plate 71 is glued to the front right side of the housing of the circuit breaker 7. The rear end of the housing 2 is attracted to the front side of the suction plate 71 by the magnet 21. The trip detection circuit is equipped with a photoelectric switch T2. The photoelectric switch T2 is horizontally installed on the front outer side of the housing 2, and the left side of its probe head is aligned with the right side of the front operating handle 72 of the circuit breaker.

[0019] Figure 1 , 2As shown in Figures 3 and 4, the rear of the probe of photoelectric switch T2 is positioned forward of the lower end of the operating handle 72 of the circuit breaker. When the circuit breaker 7 is in the upward closed state, its operating handle 72 will not obstruct the probe of the photoelectric switch. When the circuit breaker 7 is in the downward closed state, the front end of its operating handle 72 will pass through the left front end of the probe of photoelectric switch T2. The rectifier circuit includes a bridge rectifier T1 and a capacitor C1 connected by wires. The power output terminals 3 and 4 of the bridge rectifier T1 are connected to the two terminals of the capacitor C1 respectively. The temperature detection circuit includes a thermistor RT, a resistor R1, an adjustable resistor RP, and transistors Q1 and Q2 connected by wires. The heated surface of the thermistor RT is located outside the opening at the front end of the outer casing 2. One end of the thermistor RT is connected to the emitter of the first transistor Q2, and the other end of the thermistor RT is connected to one end of the adjustable resistor RP and one end of the resistor R1. The other end of the resistor R1 is connected to the base of the second transistor Q1, and the collector of the second transistor Q1 is connected to the base of the first transistor Q2. The other end of the adjustable resistor RP is connected to the emitter of the second transistor Q1. The leakage current detection circuit includes a resistor R3 and a thyristor VS connected by wires, a fixed housing 81, and a metal block 82. The resistor R3 and the thyristor VS are installed inside the housing 2. The lower end of the fixed housing 81 has an open structure, and a hollow annular permanent magnet 83 is glued to the inner side of the lower end. The metal block 82 is glued to the middle of the inner side of the magnet 83, and the metal block 82, the magnet 83, and the lower end of the fixed housing 81 are on the same plane. The wire connected to the upper end of the middle of the metal block 82 is led out through the outer opening in the middle of the upper end of the fixed housing 81 (the opening is sealed with sealant). The metal block 82 is attracted to the inner side of the switch cabinet body 1 by the magnet 83 (the metal block 82 contacts the inner cabinet of the switch cabinet body). The upper end of the metal block 82 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the control electrode of the thyristor VZ. The circuit breaker tripping detection circuit includes a resistor R2, a silicon controlled rectifier (SCR) VS1, and a buzzer B connected by wires. It is also connected to a photoelectric switch T2 by wires. The anode of the SCR VS1 is connected to pin 1 of the positive power input terminal of the photoelectric switch T2. The power output terminal 3 of the photoelectric switch T2 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to the control electrode of the SCR VS1. The cathode of the SCR VS1 is connected to the positive power input terminal of the buzzer B. The negative power input terminal 2 of the photoelectric switch T2 is connected to the negative power input terminal of the buzzer B.

[0020] Figure 1 , 2As shown in Figures 3 and 4, the two power output terminals 3 and 4 of the current transformer T and the two terminals of the first power plug CT1 are connected by wires. The power input terminals of the rectifier circuit, the bridge rectifier T1, the bridge rectifier T1, the bridge rectifier T1, the bridge rectifier T1, the bridge rectifier T1, the bridge rectifier T1, the bridge rectifier T1, the rectifier T1, the rectifier T1, the thermistor RT, the thermistor RP, the rectifier T1, the photoelectric switch T2, the rectifier T1, the rectifier T2 ... The plugs of power plugs CT1 and CT2 are inserted into the sockets of power sockets CZ1 and CZ2, respectively. Figure 4 In this circuit, resistors R1, R2, and R3 have resistance values ​​of 43KΩ, 10KΩ, and 2MΩ, respectively; thyristors VS and VS1 are single-phase thyristors of model MCR100-1; transistors Q1 is model 9013 (NPN) and Q2 is model 9012 (PNP); thermistor RT is model NTC20D-20 negative temperature coefficient thermistor; battery G1 is a 6V / 10Ah lithium battery; bridge rectifier T1 is model MB10FSOP-4; adjustable resistor RP has a resistance value of 10KΩ (adjusted to 7KΩ in this embodiment); capacitor C1 is model 470μF / 25V (for filtering); photoelectric switch T2 is model E3F-DS10C430C4. The finished electric switch has two power input terminals and one signal output terminal. The signal output terminal will output power when the front end of its detector is blocked by an obstacle, and not output power otherwise. The photoelectric switch has a distance adjustment knob inside the right-hand housing; adjusting it to the left increases the detection distance, and adjusting it to the right decreases the detection distance (this new model adjusts to approximately 10 cm). The LED display screen is a P10 model (which displays the text "Switch Cabinet Leakage" when powered on). The current transformer T is an OPCT10AL-5A open-type current transformer. The alarm B is an XQ-6V active continuous audible alarm. The battery G1 is a 6V / 10Ah model. Power sockets CZ1 and CZ2 are located outside two openings at the top of the casing.

[0021] Figure 1 , 2As shown in Figures 3 and 4, this new type is based on a low-voltage switchgear body, which is installed in the power distribution room. It includes wiring terminals, various knife switches, protective devices (such as air switches and fuses), measuring devices (such as voltmeters and ammeters), and metering devices (such as active and reactive power meters), etc., for the conversion and control of electrical energy in power, lighting, and power distribution. The aforementioned low-voltage switchgear body is a mature existing technology; therefore, its working principle will not be elaborated upon without further explanation.

[0022] The power phase line passes through the center hole of the current transformer T. The 3rd and 4th pins of the current transformer T output low voltage and low current power to the power input terminal of the bridge rectifier T1 (the larger the power consumption at the load end, the larger the output current and voltage, and vice versa). The bridge rectifier T1 converts the AC power to about 6V DC power to charge the battery G1 (filtered by capacitor C1). In this way, since the current transformer works in conjunction with the battery G1, no external power supply is needed to charge the battery. Since the outer casing 2 and the fixed casing 81 are magnetically attached to the front end of the circuit breaker 7 and the inner end of the switch cabinet body 1 respectively, the outer casing 2 and the fixed casing 81 can be easily removed when it is necessary to maintain the components inside the outer casing 2, making the application more convenient. After the temperature detection circuit is powered on, if the temperature inside the switch cabinet body 1 is normally below 40℃, the temperature of the heated surface of the thermistor RT is relatively low and the resistance value is relatively large. The voltage drop between the thermistor RT and the adjustable resistor RP is large. In this way, the 6V power supply is reduced by the voltage between the thermistor RT and the adjustable resistor RP. The voltage drop and current limiting of the resistor R1 enters the base of the transistor Q1 below 0.7V. The transistor Q1 will not conduct, the thyristor VS1 will not be triggered to conduct, and the buzzer B will not be powered on and sound. When the internal temperature of the switch cabinet body 1 is abnormally high, exceeding 40℃, the thermistor RT has a relatively high surface temperature and a relatively low resistance value. Therefore, the voltage drop between the thermistor RT and the adjustable resistor RP is small. Thus, the 6V power supply, through the voltage drop and current limiting effect of resistor R1, enters the base of transistor Q1, where the voltage is higher than 0.7V. Transistor Q1 conducts, and its collector outputs a low level, which enters the base of transistor Q2. Transistor Q2 then conducts, and its collector outputs a high level. This high level, after being reduced by resistor R2, triggers the control electrode of the thyristor VS1. The thyristor VS1 is then triggered and conducts, energizing the buzzer B and causing it to sound. When the circuit breaker is not open, its handle will not move downwards, blocking the probe of photoelectric switch T2. Pin 3 of photoelectric switch T2 will not output a high level, the thyristor VS1 will not be triggered, and the buzzer B will not be energized and sound. When the circuit breaker trips for various reasons (such as overload, short circuit, or circuit breaker malfunction), its handle moves downwards and momentarily blocks the detector head of photoelectric switch T2. The high-level output from pin 3 of photoelectric switch T2 is then triggered by resistor R2 (voltage reduction and current limiting), activating the control electrode of thyristor VS1. Thyristor VS1 then conducts, energizing the buzzer B. If there is no leakage current within switch cabinet body 1, no leakage current triggers thyristor VS, and VS will not conduct, so the LED display will not be powered. However, if a leakage current occurs within switch cabinet body 1, the leakage current is triggered by resistor R3 (voltage reduction and current limiting), activating thyristor VS. VS will then conduct, supplying power to the LED display's input terminal, energizing the LED display and displaying the message "Switch cabinet leakage."Through the above, this new type of equipment can monitor in real time whether the temperature inside the cabinet exceeds the standard and whether there is any leakage in the cabinet. It can also monitor whether the circuit breaker is closed in real time through photoelectric switches. When there is leakage in the cabinet, it can intuitively remind the workers on the LED display screen, reducing the chance of electric shock. When the temperature exceeds the standard and the circuit breaker is closed, it can promptly remind the relevant personnel to deal with the problem in time through the alarm, reducing the escalation of related electrical equipment failures and enabling the timely restoration of the operation of electrical equipment powered by the switch cabinet body.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0024] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multifunctional low-voltage switchgear, comprising a low-voltage switchgear body, a current transformer, a battery, a power socket, a power plug, and a housing, characterized in that, It also includes a rectifier circuit, a temperature detection circuit, a leakage current detection circuit, and a tripping detection circuit; the leakage current detection circuit is equipped with an LED display screen, which is installed on the front side of the cabinet door of the low-voltage switchgear body; the current transformer is installed on the upper part of the circuit breaker housing inside the switchgear body, and one of the phase wires of the circuit breaker passes through the center hole of the current transformer; the battery, power socket, rectifier circuit, temperature detection circuit, leakage current detection circuit, and tripping detection circuit are installed inside the housing, a magnet is installed on the rear outer end of the housing, a suction plate is installed on the front end of the circuit breaker housing, and the rear end of the housing is attracted to the front end of the suction plate by the magnet; the tripping detection circuit is equipped with a photoelectric switch. The photoelectric switch is horizontally mounted on the front outer side of the housing. The two power output terminals of the current transformer and the two terminals of the first power plug are electrically connected. The power input terminal of the rectifier circuit and the two terminals of the first power socket are electrically connected. The power output terminal of the rectifier circuit is electrically connected to the two poles of the battery and the power input terminals of the temperature detection circuit, leakage detection circuit, and trip detection circuit. The signal input terminal of the trip detection circuit and the signal output terminal of the temperature detection circuit are electrically connected. The power input terminal of the LED display screen and the two terminals of the second power plug are electrically connected. The power output terminal of the leakage detection circuit and the two terminals of the second power socket are electrically connected.

2. The multifunctional low-voltage switchgear according to claim 1, characterized in that, The plugs of the first power plug and the second power plug are inserted into the sockets of the first power socket and the second power socket, respectively.

3. The multifunctional low-voltage switchgear according to claim 1, characterized in that, The rear of the photoelectric switch's probe is positioned further forward than the lower end of the circuit breaker's operating handle.

4. A multifunctional low-voltage switchgear according to claim 1, characterized in that, The rectifier circuit includes a bridge rectifier and a capacitor that are electrically connected. The power output terminal of the bridge rectifier and the capacitor are connected separately.

5. A multifunctional low-voltage switchgear according to claim 1, characterized in that, The temperature detection circuit includes an electrically connected thermistor and resistor, an adjustable resistor, and a transistor. The heated surface of the thermistor is located outside the opening in the outer casing. One end of the thermistor is connected to the emitter of the first transistor, and the other end of the thermistor is connected to one end of the adjustable resistor and one end of the resistor. The other end of the resistor is connected to the base of the second transistor, and the collector of the second transistor is connected to the base of the first transistor. The other end of the adjustable resistor is connected to the emitter of the second transistor.

6. A multifunctional low-voltage switchgear according to claim 1, characterized in that, The leakage current detection circuit includes an electrically connected resistor and a thyristor, a fixed housing, and a metal block. The resistor and the thyristor are installed inside the housing. The lower end of the fixed housing has an open structure, and a magnet is installed on the inner side of the lower end. The metal block is installed inside the magnet plate, and the metal block, the magnet plate, and the lower end of the fixed housing are on the same plane. The metal block is connected to one end of the resistor, and the other end of the resistor is connected to the control electrode of the thyristor.

7. A multifunctional low-voltage switchgear according to claim 1, characterized in that, The circuit breaker tripping detection circuit includes an electrically connected resistor, a thyristor, a buzzer, and a photoelectric switch. The anode of the thyristor is connected to the positive power input terminal of the photoelectric switch. The power output terminal of the photoelectric switch is connected to one end of the resistor, and the other end of the resistor is connected to the control electrode of the thyristor. The cathode of the thyristor is connected to the positive power input terminal of the buzzer, and the negative power input terminal of the photoelectric switch is connected to the negative power input terminal of the buzzer.

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