Intelligent dehumidification alarm method for transformer substation and dehumidifier self-starting system

Abstract

The invention discloses a transformer substation intelligent dehumidification alarm method and a dehumidifier self-starting system, and relates to the technical field of transformer substation dehumidification, the transformer substation intelligent dehumidification alarm system comprises a control unit, the control unit comprises a main control board and a man-machine control module electrically connected with the main control board, and the man-machine control module controls start and stop of a dehumidifier through the main control board; the power supply unit comprises a main power supply module and a standby power supply module, and the main power supply module and the standby power supply module are electrically connected with the main control board and the man-machine control module; and the sensor group is electrically connected to the main control board. The problem that a fault monitoring and warning system of an existing transformer substation is not perfect enough is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of substation dehumidification, and in particular to a substation intelligent dehumidification alarm method and a dehumidifier self-starting system. Background Art

[0002] In substation operation, dehumidifiers are essential for maintaining environmental humidity and protecting power equipment. However, when traditional dehumidifiers are restored after a power outage, especially in unmanned intelligent substations, operation and maintenance personnel need to go to the site to manually restore the equipment, which consumes a lot of manpower and material resources and affects maintenance efficiency. During this period, the dehumidification operation is interrupted, which may cause the key electrical equipment of the substation to be in a high humidity environment for a long time, seriously affecting the insulation performance and reliability of the equipment and increasing the risk of electrical failure.

[0003] In addition, the existing dehumidifier fault monitoring and alarm system is not perfect, and it is difficult to transmit various fault information to operation and maintenance personnel in real time and accurately, resulting in the failure to handle faults in time, affecting the normal operation of dehumidifiers and the safety of substation equipment. Moreover, the linkage control of environmental humidity changes and dehumidifiers and ventilation devices is not intelligent enough, and accurate dehumidification and energy saving cannot be achieved. Summary of the invention

[0004] In view of the problem that the fault monitoring and alarm systems in the above-mentioned existing substations are not perfect, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a substation intelligent dehumidification alarm method and a dehumidifier self-start system, the purpose of which is to ensure that the equipment in each substation, especially the protection room, high-voltage equipment room and other places of the unmanned station, maintains a good working environment at all times as much as possible, improves the equipment's working reliability and extends the equipment's service life.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a substation intelligent dehumidification alarm method, which includes real-time monitoring of the internal environmental humidity of the substation through a sensor group, and judging whether RH1 is greater than RH2, wherein RH1 is the current environmental humidity and RH2 is the maximum humidity of the first-level dehumidification; if RH1 is greater than RH2, the dehumidifier and the ventilation device operate at the first-level power, and an alarm signal is issued at the first-level alarm frequency until RH1 is less than RH2 and RH1 is greater than RH3; if RH1 is less than RH2 and RH1 is greater than RH3, wherein RH3 is the maximum humidity of the second-level dehumidification; the dehumidifier and the ventilation device operate at the second-level power, and an alarm signal is issued at the second-level alarm frequency until RH1 is less than RH3 and RH1 is greater than RH4; if RH1 is less than RH3 and RH1 is greater than RH4, the ventilation device stops, and the dehumidifier and the ventilation device operate at the third-level power, and the alarm prompt stops at this time until RH1 is less than RH4; if RH1 is less than RH4, the dehumidifier stops.

[0007] As a preferred solution of the intelligent dehumidification alarm method for a substation of the present invention, the value of RH2 is 80%, the value of RH3 is 60%, and the value of RH4 is 50%.

[0008] As a preferred solution of the intelligent dehumidification alarm method for substation of the present invention, the first-level alarm frequency is 5 seconds / time, and the second-level alarm frequency is 15 seconds / time.

[0009] As a preferred solution of the intelligent dehumidification alarm method for substations of the present invention, wherein: the first-level power of the dehumidifier is 90% of the maximum output power, and the first-level power of the ventilation device is 100% of the maximum output power; the second-level power of the dehumidifier is 70% of the maximum output power, and the second-level power of the ventilation device is 60% of the maximum output power; the third-level power of the dehumidifier is 50% of the maximum output power.

[0010] In order to solve the above technical problems, the present invention also provides the following technical solutions: a substation dehumidifier self-start system, which is suitable for the above-mentioned substation intelligent dehumidification alarm method, including a control unit, including a main control board and a human-machine control module electrically connected thereto, the human-machine control module controls the start and stop of the dehumidifier through the main control board; a power supply unit, including a main power supply module and a standby power supply module, the main power supply module and the standby power supply module are both electrically connected to the main control board and the human-machine control module; a sensor group, the sensor group is electrically connected to the main control board.

[0011] As a preferred solution of the substation dehumidifier self-start system of the present invention, the sensor group includes a temperature sensor and a humidity sensor, and the main control board is connected with a first interface, a second interface, a third interface and a fourth interface, and the temperature sensor and the humidity sensor are electrically connected to the first interface and the second interface respectively; the third interface and the fourth interface are also electrically connected to a high voltage protector and a low voltage protector respectively.

[0012] As a preferred solution of the substation dehumidifier self-starting system of the present invention, the standby power supply module includes a charger and a lithium battery, and the main power supply module charges the lithium battery through the charger.

[0013] As a preferred solution of the substation dehumidifier self-starting system of the present invention, the ventilation device includes a fan assembly, and the fan assembly is connected to the fan relay on the main control board.

[0014] As a preferred solution of the substation dehumidifier self-starting system of the present invention, the alarm signal is sent out through an audible and visual alarm device, and the audible and visual alarm device is electrically connected to the human-machine control module.

[0015] As a preferred solution of the substation dehumidifier self-starting system of the present invention, the human-machine control module sends a startup instruction to the main control board through the RS485 interface according to the preset Modbus RTU protocol format.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention effectively solves the problems of substation dehumidifier in automatic start-up during power failure, fault alarm transmission, remote monitoring and linkage control with ambient humidity, improves the intelligence level and operation reliability of the dehumidifier, and ensures as much as possible that the equipment in unmanned substation protection rooms, high-voltage equipment rooms and other places where dehumidifiers are used can maintain a good working environment at any time, improves the working reliability of the equipment and extends the service life of the equipment, and ensures the safe operation of substation power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0019] Figure 1 The present invention is a flowchart of the intelligent dehumidification alarm method for a substation.

[0020] Figure 2 This is a diagram of the energized state of the substation dehumidifier self-starting system of the present invention.

[0021] Figure 3 This is a power failure state diagram of the substation dehumidifier self-starting system of the present invention. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Example 1

[0027] Reference Figure 1 , which is the first embodiment of the present invention, provides a substation intelligent dehumidification alarm method, which includes the following steps:

[0028] S1: Real-time monitoring of the internal humidity of the substation through the sensor group.

[0029] S2: Determine whether RH1 is greater than RH2, where RH1 is the current ambient humidity and RH2 is the maximum humidity of the first-level dehumidification.

[0030] S21: If RH1 is greater than RH2, the dehumidifier and ventilation device operate at the first-level power, and an alarm signal is issued at the first-level alarm frequency until RH1 is less than RH2 and RH1 is greater than RH3.

[0031] S22: If RH1 is less than RH2 and RH1 is greater than RH3, where RH3 is the maximum humidity of the second-level dehumidification; the dehumidifier and the ventilation device operate at the second-level power, and an alarm signal is issued at the second-level alarm frequency until RH1 is less than RH3 and RH1 is greater than RH4.

[0032] S23: If RH1 is less than RH3 and RH1 is greater than RH4, the ventilation device stops, and the dehumidifier and ventilation device operate at level 3 power, at which time the alarm prompt stops until RH1 is less than RH4.

[0033] S2: If RH1 is less than RH4, the dehumidifier stops.

[0034] The value of RH2 is 80%, the value of RH3 is 60%, the value of RH4 is 50%, the first-level alarm frequency is 5 seconds / time, and the second-level alarm frequency is 15 seconds / time.

[0035] The first-stage power of the dehumidifier is 90% of the maximum output power, and the first-stage power of the ventilation device is 100% of the maximum output power.

[0036] The secondary power of the dehumidifier is 70% of the maximum output power, and the secondary power of the ventilation device is 60% of the maximum output power.

[0037] The third level of the dehumidifier is 50% of the maximum output power.

[0038] When the RH2 value is above 80%, the impact on the substation equipment is significant and serious. The equipment is in a high humidity environment for a long time. The outdoor terminal box, mechanism box and indoor high-voltage room equipment are most seriously affected by humidity. Over time, due to excessive humidity, multiple circuit breakers in the high-voltage room flash over and discharge, accompanied by a loud discharge sound. There are many water droplets on the circuit breaker body, the contacts are severely oxidized, and the insulation resistance test results are seriously unqualified. It can no longer be put into use, affecting normal power supply. This shows that under particularly humid conditions, the performance and safe operation of the equipment are seriously affected, which may lead to equipment failure and power supply interruption.

[0039] The situation is urgent at this time, and the alarm frequency needs to be accelerated to warn the staff that the humidity is high. The staff is warned with a first-level alarm frequency of 5 seconds / time. At the same time, the dehumidifier works at the first-level power of 90% of the maximum output power, and the first-level power of the ventilation device works at 100% of the maximum output power, which can quickly reduce the air humidity.

[0040] When the RH3 value is 60% to 80%, the safe operating environment humidity index of the substation equipment may be threatened. Excessive humidity may cause the insulation material inside the equipment to absorb moisture, causing the insulation strength to decrease, which may lead to serious accidents such as short circuit and discharge. Humidity may also cause corrosion of metal parts and increase equipment maintenance costs.

[0041] The situation is rather urgent at this time, and the staff needs to be prepared for manual intervention. The alarm device alerts the staff with a first-level alarm frequency of 15 seconds per time. At the same time, the dehumidifier operates at the second-level power, which is 70% of the maximum output power, and the ventilation device operates at the second-level power, which is 60% of the maximum output power, gradually accelerating the reduction of air humidity.

[0042] When the humidity is 50% to 60%, within this humidity range, some substation equipment may begin to be affected. Equipment from different manufacturers has different tolerance to environmental humidity due to different insulation material quality. The good ones can withstand 70%, 80% or even higher environmental humidity, while the poor ones may have discharge sounds accompanied by abnormal odors when the environmental humidity is 50% or 60%. This means that at a humidity of 50% to 60%, some poor quality equipment may have shown signs of performance degradation.

[0043] At this time, the situation is in a critical warning state, but there is no need to sound an alarm. The dehumidifier only needs to operate at level 3 power of 50% of the maximum output power to meet the dehumidification requirements.

[0044] When the humidity is below 50%, the impact on substation equipment is relatively small, because this humidity level is generally considered to be relatively dry. In this environment, the insulation performance of the equipment is better, because the dry air reduces the erosion of moisture on the insulation material and reduces the risk of short circuits and discharges caused by excessive humidity. In addition, lower humidity also helps reduce the corrosion of metal parts and extend the service life of the equipment.

[0045] Furthermore, high-precision humidity sensors are installed at key locations in the substation, such as doors and windows in equipment-intensive areas, or on the surfaces of major electrical equipment. These sensors are connected to the control system through wireless Bluetooth along with dehumidifiers and ventilation devices.

[0046] Furthermore, when the humidity sensor detects that the humidity exceeds a set threshold, a start instruction is sent to the dehumidifier and the ventilation device.

[0047] At the same time, a remote control function is established through the remote control server, and the operation and maintenance personnel can adjust the operating parameters of the dehumidifier through a specific software interface on the mobile terminal, such as changing the dehumidifier power.

[0048] Among them, the dehumidifier control panel preferably adopts King Kong 5A industrial dehumidifier_CF7.5SD, which can realize the remote switch control of the dehumidifier, humidity setting and real-time monitoring of the actual operating status. It adopts a color high-brightness LED control panel and supports dual operation panels.

[0049] In the dehumidifier and ventilation device control system, according to the preset humidity level table, if the humidity is above 80%, the dehumidifier is set to ventilate at a first-level power of 90% of the maximum output power and the ventilation device is set to ventilate at 100% of the maximum output power.

[0050] When the humidity is between 60% and 80%, set the dehumidifier to 70% of the maximum output power and the ventilation device to 70% of the maximum output power.

[0051] When the humidity drops to 50% to 60%, gradually reduce the power of the dehumidifier and ventilation device until the humidity reaches the set ideal value below 50% and then stop working.

[0052] At the same time, a voice prompt module and an alarm light are set up on site to provide voice prompts and light alarms when a fault occurs or the humidity changes abnormally.

[0053] Example 2

[0054] Reference Figure 1 to Figure 3, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a substation dehumidifier self-start system, which is suitable for the substation intelligent dehumidification alarm method in the above embodiment, and also includes a control unit 100, including a main control board 101 and a human-machine control module 102 electrically connected thereto, and the human-machine control module 102 controls the start and stop of the dehumidifier through the main control board 101.

[0055] The power supply unit 200 includes a main power supply module 201 and a standby power supply module 202 , both of which are electrically connected to the main control board 101 and the human-machine control module 102 ; the sensor group 300 , which is electrically connected to the main control board 101 .

[0056] Furthermore, the dehumidifier has a self-starting mechanism after power failure: after the dehumidifier loses power due to power failure or other reasons, the human-machine control module 102 will automatically start when the power is restored.

[0057] After startup, the human-machine control module 102 sends a startup command to the main control board 101 of the dehumidifier through the RS485 communication interface based on the Modbus RTU protocol.

[0058] After receiving the Modbus RTU power-on command of RS485 communication, the dehumidifier main control board immediately starts the internal operation program, so that the dehumidifier can resume normal dehumidification operation according to the preset operation logic. This mechanism ensures that the dehumidifier can resume operation without human intervention after power is restored, which is especially suitable for scenarios such as unmanned substations.

[0059] Remote transmission of fault alarm signals: When a fault occurs in the dehumidifier, the human-machine control module 102 can monitor and obtain the operating status and fault information of the dehumidifier main control board 101 in real time through the RS485 bus.

[0060] When a fault is detected, the dehumidifier main control board 101 feeds back the corresponding fault alarm signal to the human-machine control module 102 via the RS485 bus. After receiving the alarm signal, the human-machine control module 102 uploads the fault information to the cloud server via the built-in 4G wireless communication module. The operation and maintenance personnel can view the operating status and alarm information of the dehumidifier in real time through mobile terminals, such as mobile phone APP or computer management platform.

[0061] Identifiable fault types include but are not limited to: 1. Evaporator defrost sensor failure; 2. Temperature and humidity sensor failure; 3. Abnormal compressor pressure failure; 4. Water tank full water alarm; 5. Power failure, etc.

[0062] Remote transmission of signals in power failure or fault state: When a power failure or other operating failure occurs in the dehumidifier, the human-machine control module 102 will send a fault signal to the operation and maintenance center through the cloud server.

[0063] The operation and maintenance center staff can obtain fault information through professional management software on the computer terminal and take corresponding maintenance measures in time. In order to deal with power outages, the system adopts a simple uninterruptible DC power supply system (DUPS), which includes a charger, a lithium battery and a step-down module to ensure that the human-machine control module 102 and the AC transmitter can still be powered normally during power outages.

[0064] When powered by DUPS, the human-machine control module 102 will continue to send a power failure alarm signal to the operation and maintenance center through the dedicated management software to ensure that the operator can be informed of the power failure in time. If the system is not equipped with DUPS power supply equipment, the human-machine control module 102 will not be able to continue working when the power is off, and thus cannot send a power failure signal.

[0065] The remaining structures are the same as those of Example 1.

[0066] Example 3

[0067] Reference Figure 1 to Figure 3 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the sensor group 300 includes a temperature sensor 301 and a humidity sensor 302, the main control board 101 is connected to a first interface 101a, a second interface 101b, a third interface 101c and a fourth interface 101d, and the temperature sensor 301 and the humidity sensor 302 are electrically connected to the first interface 101a and the second interface 101b respectively.

[0068] The temperature sensor 301 preferably adopts the ARTM-8 temperature sensor, and the humidity sensor 302 preferably adopts the ODY-WSD100.

[0069] The third interface 101c and the fourth interface 101d are electrically connected to a high voltage protector 103a and a low voltage protector 104a respectively. The high voltage protector 103a and the low voltage protector 104a can protect the main control board 101 from voltage shocks when power is off or on.

[0070] The standby power supply module 202 includes a charger 202a and a lithium battery 202b, and the main power supply module 201 charges the lithium battery 202b through the charger 202a.

[0071] Provide a DUPS power supply system for the dehumidifier human-machine control module 102, connect the charger 202a to an external power source, and charge the lithium battery 202b. Under normal power supply conditions, the lithium battery 202b is in a charging state; when the power supply is interrupted, the lithium battery 202b provides a stable DC power supply to the human-machine control module 102 and the AC transmitter through the step-down module. The human-machine control module 102 uses this power supply to continue to send a power failure alarm signal to the operation and maintenance center to ensure that the operation and maintenance personnel can know the situation in time.

[0072] The ventilation device includes a fan assembly A, which is connected to the fan relay 105 on the main control board 101. The fan assembly A is preferably provided with two groups, and the two groups of fan assemblies A are connected in parallel. When one group fails, the other group can still continue to supply air.

[0073] The alarm signal is sent out through the sound and light alarm device 400 , and the sound and light alarm device 400 is electrically connected to the human-machine control module 102 .

[0074] The human-machine control module 102 sends a power-on instruction to the main control board 101 through the RS485 interface according to the preset Modbus RTU protocol format.

[0075] The remaining structure is the same as that of Example 2.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A substation intelligent dehumidification alarm method, characterized in that: include, The sensor group monitors the internal humidity of the substation in real time. Determine whether RH1 is greater than RH2, where RH1 is the current ambient humidity and RH2 is the maximum humidity for first-level dehumidification; If RH1 is greater than RH2, the dehumidifier and ventilation device will operate at the first-level power, and an alarm signal will be issued at the first-level alarm frequency until RH1 is less than RH2 and RH1 is greater than RH3; If RH1 is less than RH2 and greater than RH3, where RH3 is the maximum humidity of the second-level dehumidification, the dehumidifier and ventilation device will operate at the second-level power, and an alarm signal will be issued at the second-level alarm frequency until RH1 is less than RH3 and greater than RH4. If RH1 is less than RH3, and RH1 is greater than RH4, the ventilation device stops, and the dehumidifier and ventilation device operate at level 3 power, at which point the alarm stops until RH1 is less than RH4; If RH1 is less than RH4, the dehumidifier stops.

2. The intelligent dehumidification alarm method for substation according to claim 1 is characterized in that: The value of RH2 is 80%, the value of RH3 is 60%, and the value of RH4 is 50%.

3. The intelligent dehumidification alarm method for substation according to claim 1 or 2, characterized in that: The first-level alarm frequency is 5 seconds / time, and the second-level alarm frequency is 15 seconds / time.

4. The intelligent dehumidification alarm method for substation according to claim 1, characterized in that: The primary power of the dehumidifier is 90% of the maximum output power, and the primary power of the ventilation device is 100% of the maximum output power; The secondary power of the dehumidifier is 70% of the maximum output power, and the secondary power of the ventilation device is 60% of the maximum output power; The third-level power of the dehumidifier is 50% of the maximum output power.

5. A substation dehumidifier self-starting system, characterized by: The intelligent dehumidification alarm method for a substation according to any one of claims 1 to 4 comprises: A control unit (100) comprises a main control board (101) and a human-machine control module (102) electrically connected thereto, wherein the human-machine control module (102) controls the start and stop of the dehumidifier through the main control board (101); A power supply unit (200), comprising a main power supply module (201) and a standby power supply module (202), wherein the main power supply module (201) and the standby power supply module (202) are both electrically connected to a main control board (101) and a human-machine control module (102); A sensor group (300), wherein the sensor group (300) is electrically connected to the main control board (101).

6. The substation dehumidifier self-starting system according to claim 5 is characterized in that: The sensor group (300) comprises a temperature sensor (301) and a humidity sensor (302); the main control board (101) is connected to a first interface (101a), a second interface (101b), a third interface (101c) and a fourth interface (101d); the temperature sensor (301) and the humidity sensor (302) are electrically connected to the first interface (101a) and the second interface (101b), respectively; The third interface (101c) and the fourth interface (101d) are also electrically connected to a high voltage protector (103a) and a low voltage protector (104a), respectively.

7. The substation dehumidifier self-starting system according to claim 6, characterized in that: The standby power supply module (202) comprises a charger (202a) and a lithium battery (202b), and the main power supply module (201) charges the lithium battery (202b) via the charger (202a).

8. The substation dehumidifier self-starting system according to claim 6 or 7, characterized in that: The ventilation device comprises a fan assembly (A), and the fan assembly (A) is connected to a fan relay (105) on a main control board (101).

9. The substation dehumidifier automatic start system according to claim 8, characterized in that: The alarm signal is sent out via the sound and light alarm device (400), and the sound and light alarm device (400) is electrically connected to the human-machine control module (102).

10. The substation dehumidifier self-starting system according to claim 9, characterized in that: The human-machine control module (102) sends a power-on instruction to the main control board (101) through the RS485 interface according to a preset Modbus RTU protocol format.

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