Outdoor dry-type transformer environment monitoring device

Abstract

The utility model discloses an outdoor dry-type transformer environment monitoring device. Comprising a control circuit, and an environment temperature and humidity measuring circuit, a dew point collector communication circuit, a smoke alarm measuring circuit, a winding temperature measuring circuit, an iron core temperature measuring circuit, a gate signal monitoring circuit, a current signal output circuit and a load control circuit which are electrically connected with the control circuit, an alarm control output circuit; and a load fault acquisition circuit. The outdoor dry-type transformer environment monitoring device disclosed by the utility model solves the problems that condensation, humidity control, dry-type transformer temperature measurement, fire alarm and the like in a box-type transformer cannot be simultaneously solved at present, and is used for measuring the temperature and humidity data of a dry-type transformer operation environment, the condensation condition of the box-type transformer and the temperature of a winding and an iron core in the dry-type transformer in real time; problems can be found in time, then reasonable control is carried out according to the data, normal operation of the dry transformer is ensured, and meanwhile unattended operation and intelligent management of the dry transformer and the box transformer are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of outdoor dry-type transformer monitoring, and particularly relates to an outdoor dry-type transformer environment monitoring device. Background Technique

[0002] With the development of modern power systems, the safe and stable operation of outdoor cabinets, box transformers and other equipment is crucial for the reliability of the entire power grid. Most outdoor dry-type transformer boxes operate in areas with relatively harsh environments, and the environmental temperature and humidity inside the box transformers are greatly affected by the external environment. At present, new construction projects and already put into operation projects of new energy dry-type transformers have been facing the harm of condensation, which has caused great potential safety hazards to the safe operation of dry-type transformers.

[0003] Currently, on the market, the operation environment of dry-type transformer box transformers is generally detected in a discrete and patchwork manner, and the monitoring and treatment schemes for dehumidification and anti-condensation inside the box transformers are unreliable and ineffective. The traditional dehumidification schemes cannot completely solve the problem of condensation inside dry-type transformers.

[0004] Therefore, in view of the above problems, further improvements are made. Content of the Utility Model

[0005] The main purpose of the utility model is to provide an outdoor dry-type transformer environment monitoring device, which solves the problems that currently it is impossible to simultaneously solve the problems of condensation, humidity control, dry-type transformer temperature measurement and fire alarm inside the box transformer, etc. It is used to measure the temperature and humidity data of the dry-type transformer operation environment, the condensation situation of the box transformer, and the temperature of the internal windings and iron cores of the dry-type transformer itself in real time, discover problems in time, and then make reasonable control according to these data to ensure the normal operation of the dry-type transformer, and at the same time realize unattended and intelligent management of the dry-type transformer box transformer.

[0006] To achieve the above purposes, the utility model provides an outdoor dry-type transformer environment monitoring device, which includes a control circuit and an environment temperature and humidity measurement circuit, a dew point collector communication circuit, a smoke alarm measurement circuit, a winding temperature measurement circuit, an iron core temperature measurement circuit, a door signal monitoring circuit, a current signal output circuit, a load control output circuit, an alarm control output circuit and a load fault acquisition circuit that are electrically connected to the control circuit, wherein:

[0007] The control circuit includes a controller U1 and a controller U3. The environment temperature and humidity measurement circuit includes a connection terminal P2 (for transmitting data to the 485 communication circuit) and sensors M1, M2 and M3 that are electrically connected to the connection terminal P2. The output ends of the sensors M1, M2 and M3 are respectively electrically connected to the controller U1;

[0008] The communication circuit of the dew point collector includes sensors M4, M5, M6, channel switch X1 and channel switch X2. The output terminals of sensors M4, M5 and M6 are electrically connected to the input terminals of channel switch X1 and channel switch X2 respectively, and the output terminals (DAC terminals) of channel switch X1 and channel switch X2 are electrically connected to controller U1 respectively;

[0009] The measurement circuit of the smoke alarm includes sensors M7, M8 and M9. The output terminals of sensors M7, M8 and M9 are electrically connected to the input terminals of channel switch X1 and channel switch X2 respectively;

[0010] The measurement circuit of the winding temperature includes diodes D5, D6, D7 and channel switch X3. Diode D7 is connected to the first winding temperature sensor (EX PT1000 A1 / A2), and the anode of diode D7 is sequentially connected to the 12th pin of channel switch X3 through inductor L7 and resistor R12; Diode D6 is connected to the second winding temperature sensor (EX PT1000 B1 / B2), and the anode of diode D6 is sequentially connected to the 13th pin of channel switch X3 through inductor L6 and resistor R10; Diode D5 is connected to the third winding temperature sensor (EX PT1000 C1 / C2), and the anode of diode D5 is sequentially connected to the 14th pin of channel switch X3 through inductor L5 and resistor R8; The output terminal (DAC terminal) of channel switch X3 is electrically connected to controller U1;

[0011] The measurement circuit of the core temperature includes diode D4. Diode D4 is connected to the core temperature sensor, and the anode of diode D4 is sequentially connected to the 15th pin of channel switch X3 through inductor L4 and resistor R6;

[0012] The gate signal monitoring circuit includes triode Q1. The base of triode Q1 is sequentially connected to the transformer gate through resistor R40, diode D6, resistor R39 and resistor R38. The emitter of triode Q1 is connected to triode Q2, and the collectors of triode Q1 and triode Q2 are both electrically connected to the cathode of optocoupler U16. The collector of optocoupler U16 is electrically connected to the 32nd pin of controller U1 through resistor R44;

[0013] The current signal output circuit includes a first winding output circuit, a second winding output circuit, a third winding output circuit, and an iron core output circuit. The input ends of the first winding output circuit, the second winding output circuit, the third winding output circuit, and the iron core output circuit are electrically connected to the controller U1 respectively, and the output ends of the first winding output circuit, the second winding output circuit, the third winding output circuit, and the iron core output circuit are electrically connected to the connection terminal P2 respectively;

[0014] The load control output circuit includes a dehumidifier circuit, a heating film circuit, a fan circuit, and a controller U2. The input end of the controller U2 is electrically connected to the controller U1, and the output end of the controller U2 is electrically connected to the dehumidifier circuit, the heating film circuit, and the fan circuit respectively;

[0015] The alarm control output circuit includes a controller U8 and several control relays. The input end of the controller U8 is electrically connected to the controller U1, and the output end of the controller U8 is electrically connected to each of the control relays respectively;

[0016] The load fault acquisition circuit includes a dehumidifier acquisition circuit, a heating film acquisition circuit, and a fan acquisition circuit. The output ends of the dehumidifier acquisition circuit, the heating film acquisition circuit, and the fan acquisition circuit are electrically connected to the controller U2 respectively.

[0017] As a further preferred technical solution of the above technical solution, an RS485 communication circuit is further included. The RS485 communication circuit includes a communication chip U4 and a communication chip U5. The communication chip U4 and the communication chip U5 are electrically connected to the controller U3 and the connection terminal P2 respectively.

[0018] As a further preferred technical solution of the above technical solution, a display circuit is further included. The display circuit is electrically connected to the controller U3.

[0019] As a further preferred technical solution of the above technical solution, a key detection circuit is further included. The key detection circuit is electrically connected to the controller U3.

[0020] As a further preferred technical solution of the above technical solution, a power supply circuit is further included. The power supply circuit is used for power supply. Description of the Drawings

[0021] Figure 1 is a schematic circuit diagram of an outdoor dry-type transformer environment monitoring device of the present utility model.

[0022] Figure 2 is a control circuit diagram of an outdoor dry-type transformer environment monitoring device of the present utility model.

[0023] Figure 3 It is the circuit diagram for measuring environmental temperature and humidity of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0024] Figure 4 It is the communication circuit diagram of the dew point collector of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0025] Figure 5 It is the circuit diagram for measuring the smoke alarm of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0026] Figure 6 It is the circuit diagram for measuring the winding temperature of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0027] Figure 7 It is the circuit diagram for measuring the core temperature of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0028] Figure 8 It is the circuit diagram for monitoring the door signal of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0029] Figure 9 It is the circuit diagram for outputting the current signal of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0030] Figure 10 It is the circuit diagram for outputting the load control of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0031] Figure 11 It is the circuit diagram for outputting the alarm control of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0032] Figure 12 It is the circuit diagram for collecting the load fault of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0033] Figure 13 It is the RS485 communication circuit diagram of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0034] Figure 14 It is the display circuit diagram of an outdoor dry-type transformer environmental monitoring device of the present utility model.

[0035] Figure 15 It is the key detection circuit diagram of an outdoor dry-type transformer environmental monitoring device of the present utility model. Detailed implementation manners

[0036] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present utility model defined in the following description can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present utility model.

[0037] The present utility model discloses an outdoor dry-type transformer environment monitoring device. The specific embodiments of the utility model will be further described below in conjunction with the preferred embodiments.

[0038] In the embodiments of the present utility model, those skilled in the art should note that the outdoor dry-type transformers and the like involved in the present utility model can be regarded as the prior art.

[0039] Preferred embodiment.

[0040] As Figures 1-15 shown, the utility model discloses an outdoor dry-type transformer environment monitoring device, including a control circuit (microcontroller) and an environmental temperature and humidity measurement circuit, a dew point collector communication circuit, a smoke alarm measurement circuit, a winding temperature measurement circuit, a core temperature measurement circuit, a door signal monitoring circuit, a current signal output circuit, a load control output circuit, an alarm control output circuit, and a load fault acquisition circuit that are electrically connected to the control circuit, where:

[0041] The control circuit includes controller U1 and controller U3. The environmental temperature and humidity measurement circuit includes connection terminal P2 (for transmitting data to the 485 communication circuit) and sensors M1, M2, and M3 that are electrically connected to the connection terminal P2. The output ends of the sensors M1, M2, and M3 are respectively electrically connected to the controller U1;

[0042] The dew point collector communication circuit includes sensors M4, M5, M6, channel switches X1, and X2. The output ends of the sensors M4, M5, and M6 are respectively electrically connected to the input ends of the channel switches X1 and X2, and the output ends (DAC ends) of the channel switches X1 and X2 are respectively electrically connected to the controller U1;

[0043] The smoke alarm measurement circuit includes sensors M7, M8, and M9. The output ends of the sensors M7, M8, and M9 are respectively electrically connected to the input ends of the channel switches X1 and X2;

[0044] The winding temperature measurement circuit includes diode D5, diode D6, diode D7 and channel switch X3. Diode D7 is connected to the first winding temperature sensor (EX PT1000 A1 / A2), and the anode of diode D7 is electrically connected to the 12th pin of channel switch X3 through inductor L7 and resistor R12 in sequence; diode D6 is connected to the second winding temperature sensor (EX PT1000 B1 / B2), and the anode of diode D6 is electrically connected to the 13th pin of channel switch X3 through inductor L6 and resistor R10 in sequence; diode D5 is connected to the third winding temperature sensor (EX PT1000 C1 / C2), and the anode of diode D5 is electrically connected to the 14th pin of channel switch X3 through inductor L5 and resistor R8 in sequence; the output terminal (DAC terminal) of channel switch X3 is electrically connected to controller U1;

[0045] The core temperature measurement circuit includes diode D4. Diode D4 is connected to the core temperature sensor, and the anode of diode D4 is electrically connected to the 15th pin of channel switch X3 through inductor L4 and resistor R6 in sequence;

[0046] The gate signal monitoring circuit includes triode Q1. The base of triode Q1 is connected to the transformer gate through resistor R40, diode D6, resistor R39 and resistor R38 in sequence. The emitter of triode Q1 is connected to triode Q2, and the collectors of triode Q1 and triode Q2 are both electrically connected to the cathode of optocoupler U16. The collector of optocoupler U16 is electrically connected to the 32nd pin of controller U1 through resistor R44;

[0047] The current signal output circuit includes a first winding output circuit, a second winding output circuit, a third winding output circuit and a core output circuit. The input terminals of the first winding output circuit, the second winding output circuit, the third winding output circuit and the core output circuit are respectively electrically connected to controller U1, and the output terminals of the first winding output circuit, the second winding output circuit, the third winding output circuit and the core output circuit are respectively electrically connected to connection terminal P2;

[0048] The load control output circuit includes a dehumidifier circuit, a heating film circuit, a fan circuit and controller U2. The input terminal of controller U2 is electrically connected to controller U1, and the output terminals of controller U2 are respectively electrically connected to the dehumidifier circuit, the heating film circuit and the fan circuit;

[0049] The alarm control output circuit includes a controller U8 and several control relays. The input end of the controller U8 is electrically connected to the controller U1, and the output end of the controller U8 is respectively electrically connected to each of the control relays;

[0050] The load fault acquisition circuit includes a dehumidifier acquisition circuit, a heating film acquisition circuit, and a fan acquisition circuit. The output ends of the dehumidifier acquisition circuit, the heating film acquisition circuit, and the fan acquisition circuit are respectively electrically connected to the controller U2.

[0051] Specifically, it further includes an RS485 communication circuit. The RS485 communication circuit includes communication chips U4 and U5. The communication chips U4 and U5 are respectively electrically connected to the controller U3 and the connection terminal P2.

[0052] More specifically, it further includes a display circuit. The display circuit is electrically connected to the controller U3.

[0053] Furthermore, it further includes a key detection circuit. The key detection circuit is electrically connected to the controller U3.

[0054] Even further, it further includes a power supply circuit. The power supply circuit is used for power supply.

[0055] Regarding the present utility model:

[0056] The ambient temperature and humidity measurement circuit is connected to an ambient temperature and humidity sensor, and the ambient temperature and humidity sensor is a digital sensor. The digital sensor is a high-precision digital sensor, which not only improves the measurement accuracy of temperature and humidity, but also improves the anti-interference ability of the control terminal, making the measurement stability of the ambient temperature and humidity measurement circuit better.

[0057] The dew point collector communication circuit is connected to a dew point collector. The dew point collector can measure the dew point temperature of the inner plate of the box transformer, and combined with the start and stop of controlling the silica gel heating film, it can effectively solve the condensation problem of the inner plate of the box body.

[0058] The smoke alarm measurement circuit is connected to a smoke alarm, which greatly improves the stability of signal reading. At the same time, the smoke alarm can measure the ambient smoke particle concentration in real time, and users can set the smoke alarm concentration value according to the actual situation on site to adapt to different environments.

[0059] The winding temperature measurement circuit is connected to a winding temperature sensor for measuring the temperature of the dry-type transformer winding. The winding temperature sensor is a PT100 with a wide measurement range and high accuracy. The sensor amplifies the signal through the winding temperature measurement circuit and then sends it to the internal AD sampling module of the microcontroller, with accurate measurement and fast speed.

[0060] The core temperature measurement circuit is connected to the core temperature sensor and is used to measure the temperature of the core inside the dry-type transformer. The core temperature sensor is a PT100 with a wide measurement range and high accuracy. This sensor amplifies the signal through the core temperature measurement circuit and then sends it to the AD sampling module inside the microcontroller, enabling accurate and fast measurement.

[0061] The door signal monitoring circuit is connected to the travel switch on the transformer door and receives the dry contact signal. When the dry contact signal is closed, it indicates that the dry-type transformer box door is open. When the dry contact signal is disconnected, it indicates that the dry-type transformer box door is closed. Users can connect to the situation of the dry-type transformer box door being opened in real time through the background.

[0062] The current signal output circuit is connected to the microcontroller, and the output signal is 4 - 20mA. There are a total of 4 channels of 4 - 20mA output for this device, which can convert the temperatures of 3 transformer windings and 1 transformer core into 4 - 20mA output. Users can transmit the temperatures of the transformer windings and core to the background through the 4 - 20mA signal to understand the temperatures of the on-site windings and core in real time.

[0063] The load control output circuit is connected to various load outputs, including a dehumidifier, which plays a role in dehumidifying the internal environment of the box substation; including a heating film, which can solve the condensation problem of the internal plate of the box or reduce the environmental humidity inside the cabinet; and includes a fan, which can reduce the internal environment temperature of the box or the temperature of the transformer winding.

[0064] The alarm control output circuit includes a smoke alarm output, which can output a smoke alarm dry contact signal; includes a system fault output, which can output a fault alarm dry contact; and also includes a fuel group over-temperature alarm output, a fuel group trip output, a core over-temperature alarm output, etc.

[0065] The load fault acquisition circuit includes dehumidifier, fan, and heating film fault alarms. When the dehumidifier, fan, and heating film are working, this circuit judges the load fault information by detecting the load current. When the current is zero, it indicates a load fault, otherwise it is normal.

[0066] The RS485 communication circuit can upload all the measurement information, working status, fault conditions, etc. of the device to the background control room, facilitating the background users to understand the operation status of the on-site device in real time and ensuring the good operation of the device.

[0067] The display circuit is connected to the digital tube and LED indicators, and can intuitively display the measurement data, working status, fault information, etc. of the device.

[0068] The key detection is connected to the tactile key, and can flexibly perform corresponding parameter settings, interface adjustments, etc. according to needs.

[0069] The power supply circuit connects the entire system, which is used to convert the commercial power into the low-voltage direct current required by the system and supply power to the internal circuit.

[0070] The beneficial effects of the present utility model are as follows:

[0071] 1. The product has a high integration level, integrating the functions of a dry-type transformer temperature controller, intelligent management function for condensation in box-type transformers, and humidity management function for the internal environment of box-type transformers.

[0072] 2. At the same time, it has a wide-voltage and high-performance switching power supply, with the voltage reaching (85 - 500) V / AC, (45 - 60) Hz; (100 - 700) V / DC, which ensures the anti-interference ability of the circuit. Using industrial-grade components ensures the stability of the circuit in a harsh environment.

[0073] 3. The device can configure the number of environmental temperature and humidity sensors, dew point collectors, and smoke alarms according to the user's needs, which can greatly improve the cost performance of the device.

[0074] 4. The device can also communicate with 1 - 8 external dehumidifiers through RS485, display all information of the dehumidifiers on the device, and can also set the parameters of the dehumidifiers through the device, enabling systematic management of the operation of the dehumidifiers.

[0075] 5. The product can detect the smoke concentration in each indoor environment of the dry-type and box-type transformers in real time, can detect potential fire hazards in the box early, and prevent fires from occurring; when the smoke concentration reaches the threshold value, it can automatically stop the heater or fan to avoid the expansion of faults.

[0076] 6. The device can detect the disconnection of various sensors and output loads. When a fault occurs, the device can output a fault alarm signal in time to inform the customer.

[0077] 7. It has an RS485 communication function, which can upload the local working information of the device to the background control system, facilitating users to understand the operation of the on-site device.

[0078] It is worth mentioning that the technical features related to outdoor dry-type transformers involved in the patent application of the present utility model should be regarded as the prior art. The specific structures, working principles, and possible control methods and spatial layout methods of these technical features can be selected conventionally in the art, and should not be regarded as the invention points of the present utility model patent. The present utility model patent will not be further specifically elaborated.

[0079] For those skilled in the art, it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An outdoor dry-type transformer environment monitoring device, characterized in that: It includes a control circuit and an environmental temperature and humidity measurement circuit electrically connected to the control circuit, a dew point collector communication circuit, a smoke alarm measurement circuit, a winding temperature measurement circuit, a core temperature measurement circuit, a gate signal monitoring circuit, a current signal output circuit, a load control output circuit, an alarm control output circuit and a load fault collection circuit, wherein: The control circuit includes a controller U1 and a controller U3, the ambient temperature and humidity measurement circuit includes a connection terminal P2 and a sensor M1, a sensor M2 and a sensor M3 electrically connected to the connection terminal P2, and the output terminals of the sensor M1, the sensor M2 and the sensor M3 are electrically connected to the controller U1 respectively; The dew point collector communication circuit includes a sensor M4, a sensor M5, a sensor M6, a channel switch X1 and a channel switch X2, the output ends of the sensor M4, the sensor M5 and the sensor M6 are electrically connected to the input ends of the channel switch X1 and the channel switch X2, respectively, and the output ends of the channel switch X1 and the channel switch X2 are electrically connected to the controller U1, respectively; The smoke alarm measurement circuit comprises a sensor M7, a sensor M8 and a sensor M9, and the output ends of the sensor M7, the sensor M8 and the sensor M9 are electrically connected to the input ends of the channel switch X1 and the channel switch X2 respectively; The winding temperature measurement circuit includes a diode D5, a diode D6, a diode D7 and a channel switch X3, wherein the diode D7 is connected to the first winding temperature sensor and the anode of the diode D7 is electrically connected to the 12th pin of the channel switch X3 through the inductor L7 and the resistor R12 in sequence; the diode D6 is connected to the second winding temperature sensor and the anode of the diode D6 is electrically connected to the 13th pin of the channel switch X3 through the inductor L6 and the resistor R10 in sequence; the diode D5 is connected to the third winding temperature sensor and the anode of the diode D5 is electrically connected to the 14th pin of the channel switch X3 through the inductor L5 and the resistor R8 in sequence; the output end of the channel switch X3 is electrically connected to the controller U1; The core temperature measurement circuit includes a diode D4, the diode D4 is connected to the core temperature sensor and the anode of the diode D4 is electrically connected to the pin 15 of the channel switch X3 through the inductor L4 and the resistor R6 in sequence; The gate signal monitoring circuit includes a transistor Q1, the base of the transistor Q1 is connected to the transformer gate through a resistor R40, a diode D6, a resistor R39 and a resistor R38 in sequence, the emitter of the transistor Q1 is connected to the transistor Q2, and the collector of the transistor Q1 and the collector of the transistor Q2 are both electrically connected to the cathode of the photocoupler U16, and the collector of the photocoupler U16 is electrically connected to the 32 pin of the controller U1 through a resistor R44; The current signal output circuit includes a first winding output circuit, a second winding output circuit, a third winding output circuit and an iron core output circuit, the input ends of the first winding output circuit, the second winding output circuit, the third winding output circuit and the iron core output circuit are electrically connected to the controller U1 respectively, and the output ends of the first winding output circuit, the second winding output circuit, the third winding output circuit and the iron core output circuit are electrically connected to the connection end P2 respectively; The load control output circuit includes a dehumidifier circuit, a heating film circuit, a fan circuit and a controller U2, the input end of the controller U2 is electrically connected to the controller U1 and the output end of the controller U2 is electrically connected to the dehumidifier circuit, the heating film circuit and the fan circuit respectively; The alarm control output circuit includes a controller U8 and a plurality of control relays, wherein the input end of the controller U8 is electrically connected to the controller U1 and the output end of the controller U8 is electrically connected to each of the control relays; The load fault acquisition circuit includes a dehumidifier acquisition circuit, a heating film acquisition circuit and a fan acquisition circuit. The output ends of the dehumidifier acquisition circuit, the heating film acquisition circuit and the fan acquisition circuit are electrically connected to the controller U2 respectively.

2. The outdoor dry-type variable-temperature environment monitoring device according to claim 1, characterized in that: It also includes an RS485 communication circuit, which includes a communication chip U4 and a communication chip U5. The communication chip U4 and the communication chip U5 are electrically connected to the controller U3 and the connection terminal P2 respectively.

3. The outdoor dry-type transformer environment monitoring device according to claim 2, characterized in that: It also includes a display circuit, which is electrically connected to the controller U3.

4. The outdoor dry-type variable-temperature environment monitoring device according to claim 3, characterized in that: It also includes a key detection circuit, which is electrically connected to the controller U3.

5. The outdoor dry-type transformer environment monitoring device according to claim 4, characterized in that: Also included is a power supply circuit, which is used for supplying power.

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