Humidity control device for high-voltage cabinet of power distribution room

Abstract

The utility model discloses a humidity control device for a high-voltage cabinet of a power distribution room, and belongs to the field of electrical technology. The humidity control device comprises a control circuit arranged in the high-voltage cabinet, a raindrop detection circuit electrically connected with the control circuit and arranged outside the power distribution room, a first humidity detection circuit arranged in the power distribution room and a second humidity detection circuit arranged in a cable trench of the high-voltage cabinet; the control circuit is further electrically connected with an air heating circuit arranged in the high-voltage cabinet, and the control circuit receives humidity or raindrop signals and starts the air heating circuit. The humidity inside and outside the cabinet is detected in real time through the humidity detection sensor, and the air heating circuit is controlled to heat air in the high-voltage cabinet, so that air pressure in the cabinet is higher than that outside the cabinet, moisture outside the cabinet is difficult to enter the cabinet, and due to temperature rise in the cabinet, the dew point temperature in the cabinet can be increased, the problem of dew formation is reduced, and the humidity in the cabinet is reduced. And the insulation effect in the cabinet is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to a humidity control device for a high-voltage cabinet in a power distribution room. Background Art

[0002] The high-voltage cabinet in the distribution room has high requirements for humidity. The high-voltage cabinet is required to be sealed for safety reasons, and the cabinet door is interlocked. Normally, the high-voltage cabinet is always in a closed state, but due to the on-off state conversion of the switch in the cabinet, the power-on operation in the cabinet, etc., the temperature inside the cabinet will be higher than the temperature in the room. The difference in temperature inside and outside will cause the air pressure difference inside and outside the cabinet, causing moisture outside the cabinet to enter the cabinet. Because the cabinet is sealed, the moisture in the cabinet will stay for a long time, causing the related components in the high-voltage cabinet to rust, and then cause insulation deterioration, discharge, and even short circuit and other serious events. Utility Model Content

[0003] Technical problem solved by the utility model: In view of the problems existing in the use of the high-voltage cabinet in the distribution room in the prior art, the utility model provides a humidity control device for the high-voltage cabinet in the distribution room, which heats the air in the high-voltage cabinet so that the air pressure in the cabinet is higher than that outside the cabinet, making it difficult for moisture outside the cabinet to enter the cabinet, and because the temperature in the cabinet increases, the dew point temperature in the cabinet will be increased, reducing the condensation problem, reducing the humidity in the cabinet, and improving the insulation effect in the cabinet.

[0004] Technical solution: The utility model discloses a humidity control device for a high-voltage cabinet in a power distribution room, the humidity control device comprising a control circuit arranged in the high-voltage cabinet, a raindrop detection circuit arranged outside the power distribution room and electrically connected to the control circuit, a first humidity detection circuit arranged in the power distribution room, and a second humidity detection circuit arranged in the cable trench of the high-voltage cabinet;

[0005] The control circuit is also electrically connected to an air heating circuit arranged in the high-voltage cabinet, and the control circuit receives a humidity or raindrop signal and starts the air heating circuit.

[0006] Preferably, the raindrop detection circuit comprises a voltage comparator U1, a resistor R1, a resistor R2, an adjustable potentiometer PR1, a dew point sensor HDS, a power supply P1 and an isolation diode D1;

[0007] The two ends of the voltage divider circuit composed of resistor R1 and resistor R2 are connected to the positive electrode of power supply P1 and ground respectively, and the middle common end is connected to the positive end of voltage comparator U1 to determine the reference voltage V+; the two ends of the voltage divider circuit composed of dew point sensor HDS and adjustable potentiometer PR1 are connected to the positive electrode of power supply P1 and ground respectively, and the middle common end is connected to the negative end of voltage comparator U1 to determine the reference voltage V-; the output end of voltage comparator U1 is connected to metal contact A through isolation diode D1; the positive power supply end of voltage comparator U1 is connected to the positive electrode of power supply P1, and the negative power supply end is grounded.

[0008] Preferably, the first humidity detection circuit and the second humidity detection circuit have the same circuit structure, and both include a voltage comparator U1, a resistor R1, a resistor R2, an adjustable potentiometer PR1, a humidity sensor HDR, a power supply P1 and an isolation diode D1;

[0009] The two ends of the voltage divider circuit composed of the resistor R1 and the resistor R2 are connected to the positive electrode of the power supply P1 and the ground respectively, and the middle common end is connected to the positive end of the voltage comparator U1 to determine the reference voltage V+; the two ends of the voltage divider circuit composed of the humidity sensor HDR and the adjustable potentiometer PR1 are connected to the positive electrode of the power supply P1 and the ground respectively, and the middle common end is connected to the negative end of the voltage comparator U1 to determine the reference voltage V-; the output end of the voltage comparator U1 is connected to the metal contact B through the isolation diode D1; the positive power supply end of the voltage comparator U1 is connected to the positive electrode of the power supply P1, and the negative power supply end is grounded.

[0010] Preferably, the control circuit includes an AC contactor K, the raindrop detection circuit, the first humidity detection circuit and the second humidity detection circuit are connected to the positive terminal of the AC contactor K through an isolation diode D2, an isolation diode D3 and an isolation diode D4 respectively, and the negative terminal of the AC contactor K is grounded.

[0011] Preferably, the common end between the raindrop detection circuit and the isolation diode D2 is connected to the light emitting diode D5 and the current limiting resistor R3, and the output end of the current limiting resistor R3 is connected to the AC contactor K and grounded;

[0012] The common terminal between the first humidity detection circuit and the isolation diode D3 is connected to the light emitting diode D6 and the current limiting resistor R4, and the output end of the current limiting resistor R4 is connected to the AC contactor K and grounded;

[0013] The common terminal between the second humidity detection circuit and the isolation diode D4 is connected to the light emitting diode D7 and the current limiting resistor R5, and the output terminal of the current limiting resistor R5 is connected to the AC contactor K and grounded.

[0014] Preferably, the air heating circuit includes a power supply circuit V1 connected to an AC contactor K, a heating indicator light L1 and a plurality of heating circuits are connected in parallel to the power supply circuit V1, and the heating circuit is formed by an air switch S and a heater J connected in series.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects:

[0016] The humidity control device of the utility model detects the humidity inside and outside the cabinet in real time through the humidity detection sensor and controls the air heating circuit to heat the air in the high-voltage cabinet so that the air pressure inside the cabinet is higher than that outside the cabinet, making it difficult for moisture outside the cabinet to enter the cabinet, and because the temperature inside the cabinet increases, the dew point temperature inside the cabinet will be increased, the condensation problem will be reduced, the humidity inside the cabinet will be reduced, and the insulation effect inside the cabinet will be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the control system structure of the humidity control device of the utility model;

[0018] Figure 2 for Figure 1 Medium humidity detection sensor circuit diagram;

[0019] Figure 3 for Figure 1 Circuit diagram of raindrop detection sensor;

[0020] Figure 4 for Figure 1 General diagram of the system control circuit.

[0021] Figure numerals: 100, humidity control device; 1, control circuit; 2, raindrop detection circuit; 3, first humidity detection circuit; 4, second humidity detection circuit; 5, air heating circuit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1 to 4 The technical scheme of the embodiment of the utility model is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0023] like Figure 1As shown, in a hot-rolling steel plant, the water treatment high-voltage room is located on the first floor, and there is a cable trench under the high-voltage cabinet, which is connected to the outside world, and the indoor humidity is relatively high. Therefore, a humidity control device of the embodiment of the utility model is set in the high-voltage cabinet. The humidity control device 100 includes a control circuit 1 arranged in the high-voltage cabinet, a raindrop detection circuit 2 arranged outside the power distribution room and electrically connected to the control circuit 1, a first humidity detection circuit 3 arranged in the power distribution room, and a second humidity detection circuit 4 arranged in the cable trench of the high-voltage cabinet; the control circuit 1 is also electrically connected to an air heating circuit 5 arranged in the high-voltage cabinet, and the control circuit 1 receives a humidity or raindrop signal and starts the air heating circuit 5. When working, the humidity control device of the utility model can detect the humidity inside and outside the high-voltage cabinet in real time through humidity detection sensors arranged at different positions of the high-voltage cabinet in the distribution room, and control the air heating circuit through the control circuit to heat the air in the high-voltage cabinet, so that the air pressure in the high-voltage cabinet is higher than that outside the high-voltage cabinet, making it difficult for moisture outside the high-voltage cabinet to enter the high-voltage cabinet, and because the temperature in the high-voltage cabinet increases, the dew point temperature in the high-voltage cabinet is increased to reduce condensation problems, reduce the humidity in the high-voltage cabinet, and improve the insulation effect in the high-voltage cabinet.

[0024] like Figure 2 As shown, the raindrop detection circuit 2 includes a voltage comparator U1, a resistor R1, a resistor R2, an adjustable potentiometer PR1, a dew point sensor HDS, a power supply P1 and an isolation diode D1; the two ends of the voltage divider circuit composed of the resistor R1 and the resistor R2 are respectively connected to the positive electrode of the power supply P1 and the ground, and the middle common end is connected to the positive end of the voltage comparator U1 to determine the reference voltage V+; the two ends of the voltage divider circuit composed of the dew point sensor HDS and the adjustable potentiometer PR1 are respectively connected to the positive electrode of the power supply P1 and the ground, and the middle common end is connected to the negative end of the voltage comparator U1 to determine the reference voltage V-; the output end of the voltage comparator U1 is connected to the metal contact A through the isolation diode D1; the positive power supply end of the voltage comparator U1 is connected to the positive electrode of the power supply P1, and the negative power supply end is grounded. When the weather conditions outside the distribution room are good, the resistance of the dew point sensor HDS is large, the voltage of the reference voltage V- is high, higher than the voltage of the reference voltage V+, the voltage comparator U1 outputs a low level, and the AC contactor K remains in the disconnected state; when it rains or condenses outside the distribution room, causing high humidity, the resistance of the dew point sensor HDS is small, the voltage of the reference voltage V- is low, lower than the voltage of the reference voltage V+, the voltage comparator U1 outputs a high level, and the AC contactor K can be controlled to be in the on state, and the air heating circuit 5 heats the high-voltage cabinet.

[0025] like Figure 3As shown, the first humidity detection circuit 3 and the second humidity detection circuit 4 have the same circuit structure, both including a voltage comparator U1, a resistor R1, a resistor R2, an adjustable potentiometer PR1, a humidity sensor HDR, a power supply P1 and an isolation diode D1; the two ends of the voltage divider circuit composed of the resistor R1 and the resistor R2 are respectively connected to the positive electrode of the power supply P1 and the ground, and the middle common end is connected to the positive end of the voltage comparator U1 to determine the reference voltage V+; the two ends of the voltage divider circuit composed of the humidity sensor HDR and the adjustable potentiometer PR1 are respectively connected to the positive electrode of the power supply P1 and the ground, and the middle common end is connected to the negative end of the voltage comparator U1 to determine the reference voltage V-; the output end of the voltage comparator U1 is connected to the metal contact B through the isolation diode D1; the positive power supply end of the voltage comparator U1 is connected to the positive electrode of the power supply P1, and the negative power supply end is grounded. When the humidity in the power distribution room or the high-voltage cabinet is low, the resistance value of the humidity sensor HDR is large, the voltage of the reference voltage V- is high, higher than the voltage of the reference voltage V+, the voltage comparator U1 outputs a low level, and the AC contactor K remains in the disconnected state; when the humidity in the power distribution room or the high-voltage cabinet is high, the resistance value of the humidity sensor HDR is small, the voltage of the reference voltage V- is low, lower than the voltage of the reference voltage V+, the voltage comparator U1 outputs a high level, and then the AC contactor K can be controlled to be in the on state, and the air heating circuit 5 heats the high-voltage cabinet.

[0026] like Figure 4 As shown, the control circuit 1 includes an AC contactor K, a raindrop detection circuit 2, a first humidity detection circuit 3, and a second humidity detection circuit 4 are connected to the positive terminal of the AC contactor K through an isolation diode D2, an isolation diode D3, and an isolation diode D4, respectively, and the negative terminal of the AC contactor K is grounded. A light-emitting diode D5 and a current-limiting resistor R3 are connected to the common terminal between the raindrop detection circuit 2 and the isolation diode D2, and the output terminal of the current-limiting resistor R3 is connected to the AC contactor K and grounded; a light-emitting diode D6 and a current-limiting resistor R4 are connected to the common terminal between the first humidity detection circuit 3 and the isolation diode D3, and the output terminal of the current-limiting resistor R4 is connected to the AC contactor K and grounded; a light-emitting diode D7 and a current-limiting resistor R5 are connected to the common terminal between the second humidity detection circuit 4 and the isolation diode D4, and the output terminal of the current-limiting resistor R5 is connected to the AC contactor K and grounded. When the voltage comparator U1 of the raindrop detection circuit 2, the first humidity detection circuit 3 and the second humidity detection circuit 4 outputs a high level, it can drive the AC contactor K to close and be in the on state, and then drive the air heating circuit 5 to heat the high-voltage cabinet; wherein, the isolation diodes D2, D3, and D4 are used to prevent the dew detection circuit 2, the first humidity detection circuit 3, and the second humidity detection circuit 4 from interfering with each other, and the correspondingly arranged light-emitting diodes D5, D6, and D7 and current-limiting resistors R3, R4, and R5 form an indicator light circuit. When the humidity sensor arranged at the corresponding position detects that the humidity is high, the corresponding indicator light circuit will emit light to indicate the position.

[0027] like Figure 4 As shown, the air heating circuit 5 includes a power supply circuit V1 connected to an AC contactor K, a heating indicator light L1 and multiple heating circuits are connected in parallel in the power supply circuit V1, and the heating circuit is formed by connecting an air switch S and a heater J in series. The power supply circuit V1 is a 220v AC power supply, L1 is a working indicator light, S1-Sn are air switches, and J1-Jn are heaters in the high-voltage cabinet; when the control circuit 1 receives a signal output by any humidity sensor in the three positions, the corresponding light-emitting diode lights up the indicating position, the control circuit 1 outputs a control command to drive the AC contactor K to turn on, the heating indicator light L1 lights up, and the PTC heaters in each high-voltage cabinet start to work. When the humidity signal decreases to a set mark, the AC contactor K is disconnected, and the air heating circuit 5 stops working, which can reduce power consumption.

[0028] The working principle or working method of the utility model:

[0029] The humidity control of the utility model respectively installs three raindrop and humidity detection sensors A, B and C outside the power distribution room, inside the power distribution room and in the cable trench of the high-voltage cabinet, the three sensors are connected to the indoor controller through cables, and six PTC heaters (J1-J6) are respectively installed in six indoor high-voltage cabinets (G1-G6). When any sensor in the three areas detects that the humidity exceeds the standard, a humidity signal is output to the control circuit 1, and the light-emitting diodes D5, D6 and D7 emit light accordingly, and the control circuit 1 outputs a control command to drive the AC contactor K to close, the working indicator light L1 is lit, and the PTC heaters (J1-J6) in the six high-voltage cabinets (G1-G6) work. When the humidity signal decreases to reach the set standard, the AC contactor K is disconnected, and the air heating circuit 5 stops working.

[0030] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A humidity control device for a high voltage cabinet in a power distribution room, It is characterized in that The humidity control device (100) comprises a control circuit (1) arranged in a high-voltage cabinet, a raindrop detection circuit (2) arranged outside the power distribution room and electrically connected to the control circuit (1), a first humidity detection circuit (3) arranged in the power distribution room, and a second humidity detection circuit (4) arranged in a cable trench of the high-voltage cabinet; The control circuit (1) is also electrically connected to an air heating circuit (5) disposed in the high-voltage cabinet, and the control circuit (1) receives a humidity or raindrop signal and starts the air heating circuit (5).

2. The humidity control device for the high voltage cabinet in the power distribution room according to claim 1, It is characterized in that The raindrop detection circuit (2) comprises a voltage comparator U1, a resistor R1, a resistor R2, an adjustable potentiometer PR1, a dew point sensor HDS, a power supply P1 and an isolation diode D1; The two ends of the voltage divider circuit composed of resistor R1 and resistor R2 are connected to the positive electrode of power supply P1 and ground respectively, and the middle common end is connected to the positive end of voltage comparator U1 to determine the reference voltage V+; the two ends of the voltage divider circuit composed of dew point sensor HDS and adjustable potentiometer PR1 are connected to the positive electrode of power supply P1 and ground respectively, and the middle common end is connected to the negative end of voltage comparator U1 to determine the reference voltage V-; the output end of voltage comparator U1 is connected to metal contact A through isolation diode D1; the positive power supply end of voltage comparator U1 is connected to the positive electrode of power supply P1, and the negative power supply end is grounded.

3. The humidity control device for the high voltage cabinet in the power distribution room according to claim 2, It is characterized in that The first humidity detection circuit (3) and the second humidity detection circuit (4) have the same circuit structure, and both include a voltage comparator U1, a resistor R1, a resistor R2, an adjustable potentiometer PR1, a humidity sensor HDR, a power supply P1 and an isolation diode D1; The two ends of the voltage divider circuit composed of the resistor R1 and the resistor R2 are connected to the positive electrode of the power supply P1 and the ground respectively, and the middle common end is connected to the positive end of the voltage comparator U1 to determine the reference voltage V+; the two ends of the voltage divider circuit composed of the humidity sensor HDR and the adjustable potentiometer PR1 are connected to the positive electrode of the power supply P1 and the ground respectively, and the middle common end is connected to the negative end of the voltage comparator U1 to determine the reference voltage V-; the output end of the voltage comparator U1 is connected to the metal contact B through the isolation diode D1; the positive power supply end of the voltage comparator U1 is connected to the positive electrode of the power supply P1, and the negative power supply end is grounded.

4. The humidity control device for a high voltage cabinet in a power distribution room according to claim 3, It is characterized in that The control circuit (1) comprises an AC contactor K, the raindrop detection circuit (2), the first humidity detection circuit (3) and the second humidity detection circuit (4) are connected to the positive terminal of the AC contactor K via an isolation diode D2, an isolation diode D3 and an isolation diode D4 respectively, and the negative terminal of the AC contactor K is grounded.

5. The humidity control device for the high voltage cabinet in the power distribution room according to claim 4, It is characterized in that The common terminal between the raindrop detection circuit (2) and the isolation diode D2 is connected to a light emitting diode D5 and a current limiting resistor R3, and the output end of the current limiting resistor R3 is connected to an AC contactor K and grounded; The common terminal between the first humidity detection circuit (3) and the isolation diode D3 is connected to a light-emitting diode D6 and a current-limiting resistor R4, and the output terminal of the current-limiting resistor R4 is connected to an AC contactor K and grounded; A light emitting diode D7 and a current limiting resistor R5 are connected to a common terminal between the second humidity detection circuit (4) and the isolation diode D4, and an output terminal of the current limiting resistor R5 is connected to an AC contactor K and is grounded.

6. The humidity control device for a high voltage cabinet in a power distribution room according to claim 4, It is characterized in that The air heating circuit (5) comprises a power supply circuit V1 connected to an AC contactor K, a heating indicator light L1 and a plurality of heating circuits are connected in parallel to the power supply circuit V1, and the heating circuit is formed by an air switch S and a heater J connected in series.

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