Low-voltage drawer cabinet with temperature monitoring function

Abstract

The utility model discloses a low-voltage drawer cabinet with a temperature monitoring function, the low-voltage drawer cabinet is composed of an external cabinet body and an internal motor control loop, the internal motor control loop comprises a temperature measurement operation indicating lamp which is connected with a temperature sensor through a temperature measurement cable, and the temperature sensor is arranged at a wire outlet terminal of a contactor; the other end of the contactor is connected in series with the circuit breaker; the temperature measurement operation indicating lamp is connected with the first operation box in parallel and then connected with the third operation box through the contactor normally-open auxiliary point, the third operation box and the motor protector form a control loop, and the motor, the contactor and the circuit breaker form a primary loop. According to the utility model, through the temperature sensor and the temperature measurement operation indicating lamp which are arranged near the contactor, the operation temperature of the contactor can be visually monitored, the abnormal temperature condition of the contactor can be found in time, the safe and stable operation of the low-voltage drawer cabinet is ensured, and the electrical fire risk is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage drawer cabinets, and in particular relates to a low-voltage drawer cabinet with a temperature monitoring function. Background Art

[0002] MNS power distribution cabinet, MNS low-voltage withdrawable switchgear is an advanced low-voltage switchgear designed and improved with reference to the foreign MNS series low-voltage switchgear to meet the needs of the development of the power industry. It can meet the needs of various power supply and distribution and can be widely used in various low-voltage distribution systems such as power plants, substations, industrial and mining enterprises, buildings, hotels, municipal construction, etc.

[0003] Each cabinet of the MNS modular low-voltage switchgear is divided into three chambers, namely the horizontal busbar chamber (at the rear of the cabinet), the drawer chamber (at the front of the cabinet) and the cable chamber (at the bottom of the cabinet or on the right side of the front of the cabinet). The chambers are separated from each other by steel plates or high-strength flame-retardant plastic functional panels, and the upper and lower drawers are separated by metal plates with ventilation holes. The biggest advantage is: compact design, accommodating more functional units in a smaller space. Its biggest disadvantage is: poor ventilation and heat dissipation conditions in the drawer chamber, high temperature in the cabinet, affecting the full play of the current capacity of the conductor and each component. The heating of components inside the drawer chamber is a hidden fault point. It is difficult to detect internal faults from the appearance, which can easily cause heating and short circuit of electrical components, forming electrical equipment fires, and reducing power supply reliability.

[0004] In recent years, with the long-term continuous operation of electrical equipment, the equipment has been aging, resulting in frequent fire accidents in low-voltage distribution cabinets. After several fire accidents in distribution cabinets, the main reasons are analyzed as follows: there are many components (circuit breakers, contactors, relays, motor protectors, primary and secondary control lines, etc.) in the small drawer room, the layout is compact, and the ventilation and heat dissipation are not smooth. In particular, the frequent operation of the contactor can easily cause poor contact of the contactor contacts and heat. If the problem is not discovered in time during operation, it is easy to cause high-temperature short circuits and fires. Summary of the invention

[0005] In response to the above technical problems, the utility model provides a low-voltage drawer cabinet with a temperature monitoring function, which can avoid the blind spot of temperature detection of components inside the drawer chamber, monitor the operating temperature of the low-voltage drawer cabinet and the contactor inside the drawer chamber in real time, intuitively detect abnormal temperature conditions, and effectively ensure the safe and stable operation of the distribution cabinet.

[0006] In order to achieve the above object, the utility model provides a low-voltage drawer cabinet with a temperature monitoring function, the low-voltage drawer cabinet is composed of an external cabinet and an internal motor control circuit, the internal motor control circuit includes a temperature measurement operation indicator light connected to a temperature sensor via a temperature measurement cable, and the temperature sensor is arranged at a contactor outlet terminal; one end of the contactor is connected to the motor, and the other end is connected in series with the circuit breaker;

[0007] The temperature measurement operation indicator light is connected in parallel with the first operation box and then connected to the third operation box through the normally open auxiliary point of the contactor. The third operation box and the motor protector form a control circuit, and the motor, contactor and circuit breaker form a primary circuit.

[0008] The panel operation indicator light is connected in parallel with the second operation box and then connected in series with the third operation box through the normally closed auxiliary point of the contactor. The third operation box and the motor protector form a control circuit, and the motor is connected in series with the contactor and the circuit breaker to form a primary circuit.

[0009] Preferably, the contactor is connected in series with the motor via a current transformer in the motor protector.

[0010] Further preferably, the contactor is composed of three contact elements connected in parallel; the circuit breaker is composed of three circuit breaker elements connected in parallel.

[0011] Preferably, a start button and a stop button are provided in the third operating box.

[0012] Preferably, the external cabinet comprises a cabinet body and a plurality of drawer units.

[0013] Further preferably, the drawer unit is provided with a control panel, a control switch, a temperature measurement operation indicator light, a panel stop indicator light and a handle.

[0014] The beneficial effects of the utility model are:

[0015] A temperature sensor is set at the outlet terminal of the contactor deep in the low-voltage drawer cabinet, and then connected to the temperature measurement operation indicator light through a temperature measurement cable. When the motor of the low-voltage drawer cabinet is running, the temperature measurement operation indicator light turns on and displays the temperature in real time, so as to monitor the temperature deep in the low-voltage drawer cabinet in real time, avoid the generation of temperature monitoring blind spots of internal components of the drawer cabinet, and monitor the operating temperature of the contactor intuitively and in real time, so that abnormal temperature conditions can be discovered in time during the inspection process, and timely handled to avoid the risk of fire in electrical equipment, thereby improving the stability and safety of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the external structure of the utility model.

[0018] In the figure, 1 is the temperature measurement operation indicator light, 2 is the contactor, 3 is the circuit breaker, 4 is the motor protector, 5 is the normally open auxiliary point of the contactor, 6 is the normally closed auxiliary point of the contactor, 7 is the first operation box, 8 is the second operation box, 9 is the panel stop indicator light, 10 is the motor, 11 is the stop button, 12 is the start button, 13 is the third operation box, 14 is the cabinet, 15 is the drawer unit, 16 is the control panel, 17 is the control switch, 18 is the handle, 19 is the temperature sensor, and 20 is the current transformer. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further explained below in conjunction with the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the utility model and should not be understood as limiting the utility model. The protection scope of the utility model shall be based on the content recorded in the claims. Any modification or replacement made by a person skilled in the art to the technical solution of the utility model without creative work shall fall within the protection scope of the utility model.

[0020] Example 1

[0021] like Figure 1-2 As shown, a low-voltage drawer cabinet with a temperature monitoring function is provided, wherein the low-voltage drawer cabinet is composed of an external cabinet body and an internal motor control circuit, wherein the internal motor control circuit comprises a temperature measurement operation indicator light 1 connected to a temperature sensor 19 via a temperature measurement cable, and the temperature sensor 19 is arranged at an outlet terminal of a contactor 2, and measures the temperature near the contactor 2 deep in the low-voltage drawer cabinet, and displays it with the temperature measurement operation indicator light 1, so as to detect the temperature of the low-voltage drawer cabinet in real time and monitor it intuitively, and avoid the generation of a temperature blind spot; one end of the contactor 2 is connected to the motor 10, and the other end is connected in series with the circuit breaker 3;

[0022] The temperature measurement operation indicator light 1 is connected in parallel with the first operation box 7 and then connected to the third operation box 13 via the normally open auxiliary point 5 of the contactor. The third operation box 13 and the motor protector 4 form a control circuit, and the motor 10 forms a primary circuit with the contactor 2 and the circuit breaker 3. When the motor 10 is running, the temperature measurement operation indicator light 1 lights up;

[0023] The panel stop indicator light 9 is connected in parallel with the second operating box 8 and then in series with the third operating box 13 via the contactor normally closed auxiliary point 6. The third operating box 13 and the motor protector 4 form a control circuit, and the motor 10 forms a primary circuit with the contactor 2 and the circuit breaker 3. When the motor stops running, the panel stop indicator light 9 lights up.

[0024] Preferably, the contactor 2 is connected in series with the motor 10 via a current transformer 20 in the motor protector 4 .

[0025] Further preferably, the contactor 2 is composed of three contact elements connected in parallel; the circuit breaker 3 is composed of three circuit breaker elements connected in parallel, and the current transformer 20 is composed of three current transformer elements connected in parallel.

[0026] Preferably, a start button 12 and a stop button 11 are provided in the third operating box 13 , and the operation or stop of the motor 10 is controlled by selecting different buttons through the motor protector 4 .

[0027] Preferably, the external cabinet includes a cabinet 14 and a plurality of drawer units 15 ; the drawer units 15 are slidably connected to the cabinet 14 .

[0028] Further preferably, the drawer unit 15 is provided with a control panel 16, a control switch 17, a temperature measurement operation indicator light 1, a panel stop indicator light 9 and a handle 18; by rotating the control switch 17 to select the start button 12 and the stop button 11 in the third operating box 13, the operation or stop of the motor 10 is controlled.

Claims

1. A low-voltage drawer cabinet with temperature monitoring function, the low-voltage drawer cabinet is composed of an external cabinet body and an internal motor control circuit, Features: The internal motor control circuit comprises a temperature measurement operation indicator light (1) connected to a temperature sensor (19) via a temperature measurement cable, and the temperature sensor (19) is arranged at an output terminal of a contactor (2); one end of the contactor (2) is connected to the motor (10), and the other end is connected in series with a circuit breaker (3); The temperature measurement operation indicator light (1) is connected in parallel with the first operation box (7) and then connected to the third operation box (13) via the normally open auxiliary point (5) of the contactor. The third operation box (13) and the motor protector (4) form a control circuit, and the motor (10) forms a primary circuit with the contactor (2) and the circuit breaker (3); The panel stop indicator light (9) is connected in parallel with the second operating box (8) and then connected in series with the third operating box (13) via the normally closed auxiliary point (6) of the contactor. The third operating box (13) and the motor protector (4) form a control circuit, and the motor (10) forms a primary circuit with the contactor (2) and the circuit breaker (3).

2. A low-voltage drawer cabinet with temperature monitoring function according to claim 1, Features: The contactor (2) is connected in series with the motor (10) via a current transformer (20) in the motor protector (4).

3. A low-voltage drawer cabinet with temperature monitoring function according to claim 1 or 2, Features: The contactor (2) is composed of three contact elements connected in parallel; the circuit breaker (3) is composed of three circuit breaker elements connected in parallel.

4. A low-voltage drawer cabinet with temperature monitoring function according to claim 1, Features: The third operating box (13) is provided with a start button (12) and a stop button (11).

5. A low-voltage drawer cabinet with temperature monitoring function according to claim 1, Features: The external cabinet comprises a cabinet (14) and a plurality of drawer units (15).

6. A low-voltage drawer cabinet with temperature monitoring function according to claim 5, Features: The drawer unit (15) is provided with a control panel (16), a control switch (17), a temperature measurement operation indicator light (1), a panel stop indicator light (9), and a handle (18).

Images