CN211480541U

CN211480541U - Novel intelligent automatic power factor adjustment switch board

Info

Publication number: CN211480541U
Application number: CN201922308623.6U
Authority: CN
Inventors: 程志成; 张俊; 李滨
Original assignee: Jiangsu Delphi Intelligent Technology Co ltd
Current assignee: Jiangsu Delphi Intelligent Technology Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-09-11
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a novel intelligent automatic power factor adjustment power distribution cabinet, which comprises a metal cabinet body, wherein the metal cabinet body is internally provided with a holding space, the metal cabinet body is provided with a cabinet door, and the cabinet door is provided with a display window; the accommodating space is internally provided with a plurality of fuse-free switches, each fuse-free switch comprises a three-phase input end and a three-phase output end, the three-phase input ends are respectively and electrically connected with three-phase alternating current, and the three-phase output ends are electrically connected with loads; still dispose automatic power factor adjuster in the accommodation space, automatic power factor adjuster electricity is connected at the three-phase output to connect a plurality of condensers through a plurality of electromagnetic contactor electricity, the utility model discloses can realize the power factor of automatic adjustment three-phase alternating current.

Description

Novel intelligent automatic power factor adjustment switch board

Technical Field

The utility model relates to a switch board, in particular to novel intelligent automatic power factor adjusts switch board.

Background

In the conventional power distribution box, the power factor compensation capacitor (SC) is used as an additional component in the Automatic Power Factor Regulator (APFR), and fig. 3 is a schematic diagram of the conventional power distribution box 20 with the power factor compensation capacitor 10 additionally installed. Because the automatic power factor regulator in the existing distribution box 20 adopts a combined structure, the structure of the distribution box 20 is complex and bulky, which causes inconvenience in use and high cost, and other function adjustments are required after the completion of the assembly, which is very difficult, and the existing distribution box also lacks many functions, for example: no current zero-crossing switching in and out, no power factor display, no voltage display and protection, no current display and protection, no temperature display and protection, no phase balance display and protection, no automatic power factor regulator to directly compensate power factor, no liquid crystal display screen to monitor.

The power factor compensation capacitor (SC) for improving power factor is also called as a phase advance capacitor, and most of the power factor compensation capacitors with a fixed capacity of 500 μ F are connected in a common distribution box to improve power factor, as shown in fig. 4, a schematic diagram of a conventional distribution box 20 with a fixed capacity phase advance capacitor 10 is shown, but the power factor is changed due to start and stop of a load, and consumed reactive power is unstable, when the fixed capacity phase advance capacitor 10 stops the load, the phase advance capacitor 10 generates capacitive reactive power, which changes the current phase of a power circuit from lag to lead, so that the voltage of the power system circuit is increased, and further, the operation safety of the power system equipment and harmonic waves caused by the load are influenced, and unnecessary loss is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel intelligent automatic power factor adjustment switch board realizes the power factor of automatic adjustment three-phase alternating current.

The purpose of the utility model is realized like this: a novel intelligent automatic power factor adjustment power distribution cabinet comprises a metal cabinet body, wherein an accommodating space is arranged in the metal cabinet body, a cabinet door is arranged on the metal cabinet body, and a display window is arranged on the cabinet door; a plurality of fuse-free switches are arranged in the accommodating space and comprise three-phase input ends and three-phase output ends, the three-phase input ends are respectively electrically connected with the three-phase alternating current, and the three-phase output ends are electrically connected with loads; the accommodating space is also provided with an automatic power factor adjuster, the automatic power factor adjuster is electrically connected with the three-phase output end and a plurality of capacitors through a plurality of electromagnetic contactors, and the switching-out or switching-in of the electromagnetic contactors is controlled through the power current of the load, so that the capacitors are controlled to be switched out or switched in a split-phase mode and connected in parallel to the three-phase alternating current output end, and the power factor of the three-phase alternating current is automatically adjusted.

As a further limitation of the present invention, the display window is used for displaying the real-time power consumption information of the automatic power factor adjuster, and monitoring the real-time status of the capacitor.

As a further limitation of the present invention, the display window is a liquid crystal display.

As a further limitation of the present invention, the display window is further provided with an operation panel for switching automatic or manual operation of the automatic power factor adjuster, so that the capacitor is automatically or manually operated to be cut out or put into parallel connection with the three-phase ac output terminal.

As a further limitation of the present invention, the display window is more accessible to control the operation of the control panel, and displays the power-related value, the power factor adjustment range, the rated voltage value, the starting current value, the operating current value, the number of phases, the frequency, the number of input or output segments, the delay time of input or output, or the set cycle or weighted control program information.

As a further limitation of the invention, the automatic power factor adjuster is electrically connected to the three-phase output through a transformer.

As a further limitation of the present invention, the automatic power factor adjuster further comprises an alarm contact, providing an alarm output contact with low power factor, abnormal power factor and abnormal frequency.

As a further limitation of the present invention, the capacitor is made of a metalized film with self-healing properties, and a safety device is disposed inside the capacitor, when the capacitor is abnormal, the safety device will automatically cut out the three-phase ac power.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses can cut or drop into according to the power consumption electric current of load, control electromagnetic contactor (MC), make condenser (SC) cut or drop into parallelly connected to three-phase AC output by split phase control to the power factor of automatically regulated three-phase AC.

Drawings

Fig. 1 is the utility model discloses automatic merit is because of the outward appearance sketch map of adjustment switch board.

Fig. 2 is the utility model discloses automatic merit is because of the inside schematic diagram of adjustment switch board.

Fig. 3 is a schematic diagram of a conventional power factor compensation capacitor additionally installed on a distribution box.

Fig. 4 is a schematic diagram of a conventional fixed-capacity capacitor installed in a distribution box.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

As shown in fig. 1-2, the utility model discloses an automatic merit is because of adjusting switch board 30 is used in the power supply line of joining in marriage at the three-phase alternating current of commercial power access user, will be connected to the load after the three-phase alternating current access user, and the utility model discloses an automatic merit is because of adjusting switch board 30 can be according to the start-up or the shut down of load, the power factor of automatic adjustment three-phase alternating current.

As shown in fig. 1, the automatic power factor adjustment power distribution cabinet 30 of the present invention includes a metal cabinet 31, which can be installed on a wall surface, the metal cabinet 31 is square, and includes an accommodation space inside, a cabinet door 32 is disposed on an end surface of the metal cabinet 31, a rotation shaft is disposed on a side of the cabinet door 32, so that the cabinet door 32 can be pulled open from another side, a display window 33 is disposed on the cabinet door 32, and when the cabinet door 32 is closed, the internal space of the cabinet door can be protected from dust, water, touch, and other electricity safety and secondary disasters; the end surfaces of the two sides of the metal cabinet 31 are provided with holes for ventilation.

As shown in fig. 2, at least three non-fuse switches (NFB)34, an Automatic Power Factor Regulator (APFR)35, three electromagnetic contactors (MC)36 and three capacitors (SC)37 are disposed in the accommodating space of the metal cabinet 31, wherein the non-fuse switches (NFB)34 are disposed at an upper end and include three-phase input ends and three-phase output ends, the three-phase input ends are respectively electrically connected to three-phase alternating current, and the three-phase output ends are electrically connected to a load (not shown); the non-fuse switch (NFB)34, the Automatic Power Factor Regulator (APFR)35, the electromagnetic contactor (MC)36, and the capacitor (SC)37 are all modular structures, and can be easily repaired or replaced.

The Automatic Power Factor Regulator (APFR)35 is disposed on the inner side of the cabinet door 32 corresponding to the display window 33, the Automatic Power Factor Regulator (APFR)35 is electrically connected to the three-phase output terminal of the non-fuse switch (NFB)34, and is further electrically connected to three capacitors (SC)37 through three electromagnetic contactors (MC)36, and the Automatic Power Factor Regulator (APFR)35 is electrically connected to the three-phase output terminal through a Current Transformer (CT) (not shown). The Automatic Power Factor Regulator (APFR)35 controls the switching-out or switching-in of the electromagnetic contactor (MC)36 according to the current consumption of the load, so that the capacitor (SC)37 is switched-out or switched-in by phase splitting control and connected in parallel to the three-phase alternating current output end, thereby automatically regulating the power factor of the three-phase alternating current. The utility model discloses a condenser (SC)37 is made for the metallized film of self-healing, and its inside is equipped with a safety device, and when the condenser took place unusually, the safety device can the automatic cutout three-phase alternating current.

The three capacitors (SC1, SC2, SC3) in the embodiment of the present invention are electrically connected to the three-phase ac through three electromagnetic contactors (MC1, MC2, MC3)36, each capacitor (SC)37 is electrically connected between two phases of the three phases, i.e. between R phase and S phase, between R phase and T phase, and between S phase and T phase, and the Automatic Power Factor Regulator (APFR)35 monitors the start or stop of the load, controls the switching in or out of the electromagnetic contactor (MC)36, and when the load starts, the Automatic Power Factor Regulator (APFR)35 controls the three electromagnetic contactors (MC1, MC2, MC3)36 to be switched in, so that the three capacitors (SC1, SC2, SC3)37 are all connected in parallel between the three phases. When the load is stopped, the Automatic Power Factor Regulator (APFR)35 controls one or two or all of the electromagnetic contactors (MC1, MC2, MC3)36 to be switched out according to the magnitude of the power current of the load, so that the corresponding capacitor (SC)37 is switched out with three-phase alternating current, therefore, the Automatic Power Factor Regulator (APFR)35 of the present invention automatically controls the number of the capacitors (SC)37 to be switched out or put into parallel connection with the three-phase alternating current output end according to the power current of the load, so as to automatically regulate the power factor of the three-phase alternating current.

As shown in fig. 1, in the embodiment of the present invention, the display window 33 on the cabinet door 32 includes a liquid crystal display for displaying the real-time power consumption information of the Automatic Power Factor Regulator (APFR)35 and the real-time status of the monitoring capacitor (SC) 37. A control panel 38 is provided below the display window 33 to allow a user to switch an automatic or manual control of the Automatic Power Factor Regulator (APFR)35 to manually control or automatically switch out or put in parallel the capacitor (SC)37 to the three-phase ac output terminal, and further to display information such as a power factor value, a power factor regulation range, a rated voltage value, a starting current value, an operating current value, the number of phases, a frequency, a control of the number of switching-in or switching-out stages, a switching-in or switching-out delay time, a setting cycle or a weighted control program, and the like by the control of the control panel 38. Preferably, the Automatic Power Factor Regulator (APFR)35 of the embodiment of the present invention further includes an alarm contact, which can provide an alarm output contact for low power factor, abnormal power factor or abnormal frequency, so as to remind the user of the abnormal situation.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and deformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and deformations are all within the protection scope of the present invention.

Claims

1. A novel intelligent automatic power factor adjustment power distribution cabinet is characterized by comprising a metal cabinet body, wherein an accommodating space is arranged in the metal cabinet body, a cabinet door is arranged on the metal cabinet body, and a display window is arranged on the cabinet door; a plurality of fuse-free switches are arranged in the accommodating space and comprise three-phase input ends and three-phase output ends, the three-phase input ends are respectively electrically connected with three-phase alternating current, and the three-phase output ends are electrically connected with loads; the accommodating space is also provided with an automatic power factor adjuster, the automatic power factor adjuster is electrically connected with the three-phase output end and a plurality of capacitors through a plurality of electromagnetic contactors, and the switching-out or switching-in of the electromagnetic contactors is controlled through the power current of the load, so that the capacitors are controlled to be switched out or switched in a split-phase mode and connected in parallel to the three-phase alternating current output end, and the power factor of the three-phase alternating current is automatically adjusted.

2. The new intelligent automatic power factor adjustment switch board of claim 1, wherein the display window is used to display the real-time power consumption information of the automatic power factor adjustment and monitor the real-time status of the capacitor.

3. The new intelligent automatic power factor adjustment switch board of claim 2, characterized in that, the display window is a liquid crystal display.

4. The cabinet according to claim 1, wherein an operation panel is further disposed on the display window for switching automatic or manual operation of the automatic power factor adjuster, so that the capacitor is automatically or manually operated to be switched out or put into parallel connection with the three-phase ac output terminal.

5. The distribution cabinet according to claim 4, wherein the display window further displays power factor value, power factor adjustment range, rated voltage value, starting current value, running current value, phase number, frequency, number of switching-in or switching-out stages, switching-in or switching-out delay time, or set cycle or weighted control program information through the operation of the operation panel.

6. The new intelligent automatic power factor adjustment switch board of claim 1, characterized in that the automatic power factor adjustment is electrically connected to the three-phase output terminal through a transformer.

7. The new intelligent automatic power factor adjustment switch board of claim 1, characterized in that, the automatic power factor adjustment also includes alarm contacts, providing alarm output contacts for low power factor, abnormal power factor and abnormal frequency.

8. The new intelligent automatic power factor adjustment switch board of claim 1, wherein the capacitor is made of a self-healing metalized film, and a safety device is disposed inside the capacitor, and when the capacitor is abnormal, the safety device will automatically cut off the three-phase alternating current.