Automatic air exhaust device for overtemperature of high-voltage chamber

Abstract

The utility model provides a high-voltage chamber overtemperature automatic exhaust device, which is characterized in that a 2P air switch QF, contactors KM and a motor form a main loop, and a fuse FU, a change-over switch SA, a plurality of contactors KM, a thermal relay FR, an intermediate relay KA, a temperature controller WK, an indicating lamp HL1, an indicating lamp HL2, a contactor KM coil and an intermediate relay KA coil form a control circuit; according to the utility model, automatic control is adopted, and when indoor temperature and humidity reach set values, automatic start and stop can be realized in time; when the weather temperature is too high, an unattended transformer room operator on duty does not need to increase the number of inspection times; the maximum temperature and humidity of the automatic control temperature are set to be 38 DEG C and 40%, the service life of an indoor electrical device is greatly prolonged when the indoor electrical device operates in the following temperature and humidity environment, and the failure rate of electrical elements is obviously reduced.

Description

Technical Field

[0001] The utility model relates to the technical application field of temperature and humidity sensor automatic control equipment, in particular to an automatic exhaust device for over-temperature of a high-pressure chamber. Background Art

[0002] With the construction of the company's factory, the investment of substations and the application of various underground places, the high-voltage room temperature of the substation is often too high and the humidity exceeds the standard, which affects high-power electrical equipment with large heat dissipation such as DC cabinets, high-voltage cabinets, capacitor cabinets, and rectifier cabinets, causing the equipment to operate in an environment with excessively high temperature and humidity for a long time, causing damage to the original parts of the equipment. We have developed an automatic temperature and humidity exhaust device that automatically operates according to the surrounding environment of the equipment and performs exhaust control to meet the normal operating environment of the equipment. It can be replicated and promoted. Utility Model Content

[0003] With core components such as intelligent temperature and humidity controller (hereinafter referred to as: temperature controller), contactor, thermal element, etc., and other common indispensable electrical components, a set of devices is developed to realize the automatic application of equipment. The equipment is cheap, easy to maintain and widely used.

[0004] The utility model provides an automatic exhaust device for over-temperature of a high-voltage room, comprising a mesh plate, a 2P air switch QF, a fuse FU, a conversion switch SA, a stop button SB1, a start button SB2, a plurality of contactors KM, a thermal relay FR, an intermediate relay KA, a temperature controller WK, an indicator light HL1, an indicator light HL2 and a motor, wherein the 2P air switch QF, the contactor KM and the motor form a main circuit, wherein the fuse FU, the conversion switch SA, a plurality of contactors KM, the thermal relay FR, the intermediate relay KA, the temperature controller WK and the indicator lights HL1, HL2, the contactor KM coil and the intermediate relay KA coil form a control circuit;

[0005] The main circuit structure includes: a single-phase AC 220V power supply is connected to the upper side of a 2P circuit breaker QF, the lower side of the 2P circuit breaker QF is connected to the upper side of a main contact of a contactor KM, and the lower side of the main contact of the contactor KM is connected to a motor coil;

[0006] The control circuit comprises: the single-phase AC 220V power supply L is connected to the upper side of the fuse FU, the lower side of the fuse FU is connected to the normally open point and the normally closed point of the conversion switch SA, and is also connected to the temperature controller WK coil, the normally open point and the normally closed point of the contactor KM, the normally open point of the conversion switch SA is connected to one side of the stop button SB1, the other side of the stop button SB1 is connected to the start button SB2 and the normally open contact of the contactor KM, the other side of the start button SB2 and the normally open contact of the contactor KM is connected to the normally open contact of the intermediate relay KA and the contactor KM coil in parallel, and the other side of the contactor KM coil is connected to the thermal relay FR;

[0007] The normally closed contact of the conversion switch SA is connected to the normally open contact of the intermediate relay KA and the normally open contact of the temperature controller WK. The normally open contact of the temperature controller WK is connected to the coil of the intermediate relay KA. The normally open contact of the contactor KM connected to the lower side of the fuse FU is connected to the indicator light HL1. The normally closed contact of the contactor KM connected to the lower side of the fuse FU is connected to the indicator light HL2. The thermal relay FR, the coil of the intermediate relay KA, the coil of the temperature controller WK, the indicator lights HL1 and HL2 are connected in parallel and connected to the power supply point N.

[0008] Furthermore, the temperature controller has an RS485 communication interface for remote monitoring.

[0009] This device has the following advantages: 1. The device is automatically controlled. When the indoor temperature and humidity reach the set value, it can automatically start and stop in time. 2. When the temperature is too high, the unattended substation staff does not need to increase the number of inspections. 3. The maximum temperature and humidity of the automatic control temperature are set to 38℃ and 40%. When the indoor electrical devices are operated in the following temperature and humidity environment, the service life is greatly increased and the failure rate of electrical components is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the main circuit electrical schematic diagram of the over-temperature automatic exhaust device implemented according to the utility model;

[0011] Figure 2 The utility model is an electrical schematic diagram of a control circuit of an over-temperature automatic exhaust device. DETAILED DESCRIPTION

[0012] Temperature controller WK is a temperature and humidity measurement and control instrument widely used in various industries and fields. It integrates measurement, display, control and communication. Users can set control and alarm points by panel buttons. The instrument adopts advanced digital temperature and humidity sensors with high measurement accuracy. The instrument has RS485 communication interface for remote monitoring.

[0013] The thermal relay FR generates heat when the current flowing into the thermal element causes the bimetallic strips with different expansion coefficients to deform. When the deformation reaches a certain distance, it pushes the connecting rod to disconnect the control circuit, thereby causing the contactor KM to lose power and the main circuit to disconnect, thus achieving overload protection for the motor. As an overload protection element for motors, the thermal relay FR has been widely used in production due to its small size, simple structure, and low cost.

[0014] A set of high-pressure room over-temperature automatic exhaust device is installed on each high-pressure room exhaust fan. This device can start the fan when the indoor temperature is higher than 38°C or the humidity is higher than 40%, and stop the fan when it is lower than 24°C and the humidity is lower than 20%. A temperature and humidity probe for measuring temperature and humidity is installed on the high-pressure room exhaust fan to monitor the indoor temperature and humidity. The data detected by the temperature and humidity probe is passed through the automatic exhaust device to improve the automatic exhaust of temperature and humidity places and enhance the reliability of the equipment.

[0015] Among them, the high-voltage room over-temperature automatic exhaust device includes the main circuit air switch QF connected to the contactor KM, KM is connected to the main circuit of the motor. The control circuit fuse FU is connected to the conversion switch SA, the temperature controller WK, and the contactor KM contact. The button is connected to the contactor KM, the normally open contact of the temperature controller WK is connected to the intermediate relay KA, and the contactor KM is connected to the thermal element FR.

[0016] Figure 1 and Figure 2 is the electrical schematic diagram of this device, and the following is an analysis of the schematic diagram.

[0017] (1) Main circuit analysis

[0018] The single-phase 220V power supply is connected to the upper side of the 2P circuit breaker QF, the lower side of the 2P circuit breaker is connected to the upper side of the main contact of the contactor KM, and the lower side of the main contact of the contactor KM is connected to the motor coil.

[0019] Control circuit analysis

[0020] The single-phase AC 220V power supply L of the control circuit is connected to the upper side of the fuse FU, and the lower side of the fuse FU is connected to the normally open and normally closed points of the conversion switch SA, and at the same time connected to the normally open and normally closed points of the temperature controller WK coil and KM. The conversion switch SA is connected to one side of the stop button SB1, and the other side of the stop button SB1 is connected to the start button SB2 and the normally open contact of the contactor KM. The other side of the start button SB2 and the normally open contact of the contactor KM is connected to the normally open contact of the intermediate relay KA and the contactor KM coil in parallel, and the other side of the contactor KM coil is connected to the thermal relay FR.

[0021] The normally closed contact of the conversion switch SA is connected to the normally open contact of the intermediate relay KA and the normally open contact of the temperature controller WK. The normally open contact of the temperature controller WK is connected to the coil of the intermediate relay KA. The normally open contact of the contactor KM connected to the lower side of the fuse FU is connected to the indicator light HL1. The normally closed contact of the contactor KM connected to the lower side of the fuse FU is connected to the indicator light HL2. The thermal relay FR, the coil of the intermediate relay KA, the coil of the temperature controller WK, the indicator lights HL1 and HL2 are connected in parallel and connected to the power supply point N.

[0022] During the installation process of the device, the electrical components are first fixed on the mesh plate, the electrical components are wired, the thermal relay FR parameters are adjusted according to the rated current of the fan, and the temperature controller WK parameters are adjusted at the same time to ensure safe and reliable operation of the equipment.

[0023] The contactor KM coil, the intermediate relay KA coil and the temperature controller WK coil are respectively representations of the power supplies of the contactor KM, the intermediate relay KA and the temperature controller WK themselves.

[0024] The high-voltage room over-temperature automatic exhaust device is mainly used to solve the problem of excessive temperature and humidity in the high-voltage room. Automatic exhaust can solve the phenomenon of excessive temperature and humidity. The device has completed the electrical connection between various control components and can realize automatic control. It can also be applied to other humid and high-temperature places. The device has strong versatility and stable performance and has great promotion value.

Claims

1. An automatic exhaust device for over-temperature of a high-pressure chamber, characterized in that: Including mesh plate, 2P circuit breaker QF, fuse FU, transfer switch SA, stop button SB1, start button SB2, contactor KM, main contact of contactor KM, normally open contact of contactor KM, normally closed contact of contactor KM, thermal relay FR, intermediate relay KA, normally open contact of intermediate relay KA, temperature controller WK, indicator light HL1, indicator light HL2 and motor; Among them, 2P circuit breaker QF, contactor KM main contacts and motor form the main circuit; Among them, the fuse FU, the transfer switch SA, the button, several contactor KM contacts, the intermediate relay KA contacts, the thermal relay FR, the intermediate relay KA, the temperature controller WK and the indicator light HL1, the indicator light HL2, the contactor KM and the intermediate relay KA form a control circuit; The main circuit structure includes: a single-phase AC 220V power supply is connected to the upper side of a 2P circuit breaker QF, the lower side of the 2P circuit breaker QF is connected to the upper side of a main contact of a contactor KM, and the lower side of the main contact of the contactor KM is connected to a motor coil; The control circuit comprises: the single-phase AC 220V power supply L is connected to the upper side of the fuse FU, the lower side of the fuse FU is connected to the normally open point of the conversion switch SA and the normally closed point of the conversion switch SA, and is also connected to the temperature controller WK coil, the normally open contact of the contactor KM and the normally closed contact of the contactor KM, the normally open point of the conversion switch SA is connected to one side of the stop button SB1, the other side of the stop button SB1 is connected to the start button SB2 and the normally open contact of the contactor KM, the other side of the start button SB2 and the normally open contact of the contactor KM is connected to the normally open contact of the intermediate relay KA in parallel with the contactor KM coil, and the other side of the contactor KM coil is connected to the thermal relay FR; The normally closed contact of the conversion switch SA is connected to the normally open contact of the intermediate relay KA and the normally open contact of the temperature controller WK. The normally open contact of the temperature controller WK is connected to the coil of the intermediate relay KA. The normally open contact of the contactor KM connected to the lower side of the fuse FU is connected to the indicator light HL1. The normally closed contact of the contactor KM connected to the lower side of the fuse FU is connected to the indicator light HL2. The thermal relay FR, the coil of the intermediate relay KA, the coil of the temperature controller WK, the indicator lights HL1 and HL2 are connected in parallel and connected to the power supply point N.

2. The automatic exhaust device for over-temperature of a high-pressure chamber according to claim 1, characterized in that: The temperature controller WK is provided with an RS485 communication interface for remote monitoring.

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