CN204241921U - A dry-type transformer temperature controller with power failure alarm function - Google Patents

Abstract

The utility model relates to a kind of temperature controller of dry type transformer with dead electricity warning function, it includes single-chip microcomputer (1), sensor (2), keyboard display unit (3), air-blower control unit (4), overtemperature alarm unit (5), overtemperature trip unit (6), fault alarm unit (7), power supply (8) and dead electricity alarm unit (9), described dead electricity alarm unit (9) respectively with the 5v of power supply (8), + 12v two direct supply output points are connected, described dead electricity alarm unit (9) is connected to signal output terminal X1 and signal output terminal X2 to send dead electricity alerting signal.This temperature controller of dry type transformer with dead electricity warning function sends dead electricity alerting signal by dead electricity alarm signal output ends sub-X1, X2, the acoustic-optic alarm that dead electricity alerting signal can start duty room sends sound and light alarm, notify the timely handling failure of maintainer on duty, thus avoid transformer and burnt, avoiding having a power failure stopping production occurs.

Description

A dry-type transformer temperature controller with power failure alarm function

technical field

The utility model relates to a dry-type transformer temperature controller with a power failure alarm function, which belongs to the field of automation.

Background technique

Dry-type transformers are widely used in the national grid and enterprises for the transformation, transmission and distribution of electric energy. Simply put, dry-type transformers refer to transformers whose iron core and windings are not immersed in insulating oil. The cooling method is divided into natural cooling and forced air cooling. In order to ensure power supply, dry-type transformers are equipped with dry-type transformer temperature controllers, which are used to detect the operating temperature of the transformer and automatically control and protect the transformer.

The dry-type transformer temperature controller is designed for the reliable operation of air-cooled dry-type power transformers. Use the sensor embedded in the three-phase winding and iron core of the dry-type power transformer to detect the temperature rise of the dry-type power transformer, and automatically control the start and stop of the cooling fan according to the temperature rise, and the over-temperature alarm until the ultra-high temperature trip to ensure dry-type power. safe operation of transformers.

The dry-type transformer temperature controller is designed for the reliable operation of air-cooled dry-type power transformers. Use the sensor embedded in the three-phase winding and iron core of the dry-type power transformer to detect the temperature rise of the dry-type power transformer, and automatically control the start and stop of the cooling fan according to the temperature rise, and the over-temperature alarm until the ultra-high temperature trip to ensure dry-type power. safe operation of transformers.

The structure of the existing dry-type transformer temperature controller is shown in Figure 1, and all have the following functions:

1. It has the switching function of the three-phase winding temperature display and the highest phase temperature display.

2. It has the function of automatically controlling the opening and closing of the fan.

3. It has the function of abnormal sensor alarm.

4. It has over-temperature alarm and automatic trip function.

5. With sensor fault self-diagnosis function.

6. It has the functions of setting the temperature of the fan on, the temperature of the fan off, the temperature of the over-temperature alarm, the temperature of the over-temperature trip, and the time of the fan on.

7. It has the function of manually controlling the fan to start and stop.

8. It has the function of turning on the fan at regular intervals.

9. It has the function of "black box".

10. With analog detection function.

11. With RS-485 serial communication function.

The functions of the temperature controller can only be realized when the temperature controller is working normally, and once the temperature controller is powered off, all functions will be disabled, and the transformer will be out of control. In the case of high temperature environment or load rate, once the transformer is out of control, it is extremely dangerous, and the continuously rising temperature will burn the transformer, causing large-scale power outages and production shutdowns, with serious consequences and huge losses.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a dry-type transformer temperature controller with power failure alarm function, which can send out sound and light alarms, or trigger the integrated protector configured in the high-voltage cabinet to generate alarm information, and notify the maintenance personnel on duty Deal with the fault in time, so as to avoid the transformer from being burned, and avoid the occurrence of power outage and production stoppage.

The purpose of this utility model is achieved in that:

The utility model is a dry-type transformer temperature controller with a power failure alarm function, which includes a single-chip microcomputer, a sensor, a keyboard display unit, a fan control unit, an over-temperature alarm unit, an over-temperature trip unit, a failure alarm unit, and a power supply. A unit circuit, in which the single-chip microcomputer is connected with the sensor, keyboard display unit, fan control unit, over-temperature alarm unit, over-temperature trip unit and fault alarm unit respectively, and the power supply is connected with the alternating current to convert the alternating current into +5v, +12v Two DC power outputs for voltage, of which +5v power is supplied to the microcontroller, and +12v power is supplied to the fan control unit, over-temperature alarm unit, over-temperature trip unit and fault alarm unit. This kind of dry-type transformer temperature control with power failure alarm function The instrument also includes a power failure alarm unit, the power failure alarm unit is respectively connected to the two DC power output points of the power supply, 5v and +12v, and the power failure alarm unit is connected with a signal output terminal X1 and a signal output terminal X2 to Send a power failure alarm signal;

The circuit of the power failure alarm unit includes a resistor R1, a resistor R2, a transistor D1, a diode D2 and a relay K, wherein one end of the resistor R1 is connected to the +5v output point of the power supply 8, and the other end is connected to the b pole of the resistor R2 and the transistor D1 , the other end of the resistor R2 is connected to the negative pole "—" of the DC power supply, the positive pole of the diode D2 is connected to the +12v output point of the power supply 8, the negative pole is connected to the c pole of the triode D1, and the e pole of the triode D1 is connected to the negative pole of the DC power supply " -", the coil of the relay K is connected in parallel with the diode D2, and the normally closed point of the relay K is connected with the power failure alarm signal output terminals X1 and X2.

Compared with the prior art, the beneficial effects of a dry-type transformer temperature controller with a power failure alarm function are:

This kind of dry-type transformer temperature controller with power-off alarm function adds a temperature controller power-off alarm unit on the basis of the original technology. It detects the disappearance of +5v and +12v voltages through the voltage-loss detection circuit to judge the temperature controller. Whether there is a power failure, the power failure alarm signal output terminals X1 and X2 will send a power failure alarm signal, and the power failure alarm signal can activate the sound and light alarm device in the duty room to issue a sound and light alarm, or trigger the integrated protector configured in the high voltage cabinet to generate an alarm message , Inform the on-duty maintenance personnel to deal with the fault in time, thus avoiding the transformer from being burned and the occurrence of power outage and production stoppage.

Description of drawings

Fig. 1 is a structural schematic diagram of a dry-type transformer temperature controller with a power failure alarm function according to the present invention.

Fig. 2 is a circuit structure diagram of the power failure alarm unit in Fig. 1 .

Among them: single-chip microcomputer 1, sensor 2, keyboard display unit 3, fan control unit 4, over-temperature alarm unit 5, over-temperature trip unit 6, fault alarm unit 7, power supply 8, power failure alarm unit 9.

Detailed ways

Referring to Figure 1, the utility model relates to a dry-type transformer temperature controller with a power failure alarm function, including a conventional single-chip microcomputer 1, a sensor 2, a keyboard display unit 3, a fan control unit 4, an over-temperature alarm unit 5, an over-temperature Trip unit 6, fault alarm unit 7, power supply 8, these eight unit circuits, and a newly added power failure alarm unit 9, in which single chip microcomputer 1 is connected with sensor 2, keyboard display unit 3, fan control unit 4, and over-temperature alarm unit 5. The over-temperature tripping unit 6 is connected to the fault alarm unit 7, and the power supply 8 is connected to the alternating current, which converts the alternating current into two direct current power outputs of +5v and +12v voltages, wherein the +5v power supply is supplied to the single chip microcomputer 1 and power failure Alarm unit 9, +12v power supply fan control unit 4, over-temperature alarm unit 5, over-temperature trip unit 6, fault alarm unit 7 and power-off alarm unit 9, the power-off alarm unit 9 is connected with a signal output terminal X1 And the signal output terminal X2 to issue a power failure alarm signal.

Referring to Fig. 2, the circuit of the power failure alarm unit 9 includes a resistor R1, a resistor R2, a transistor D1, a diode D2 and a relay K, wherein one end of the resistor R1 is connected to the +5v output point of the power supply 8, and the other end is connected to the resistor R2 and the transistor D1 The other end of the resistor R2 is connected to the negative pole "—" of the DC power supply, the positive pole of the diode D2 is connected to the +12v output point of the power supply 8, the negative pole is connected to the c pole of the triode D1, and the e pole of the triode D1 is connected to On the negative pole "—" of the DC power supply, the coil of the relay K is connected in parallel with the diode D2, and the normally closed point of the relay K is connected with the power failure alarm signal output terminals X1 and X2.

The alarm principle of this dry-type transformer temperature controller with power failure alarm function is as follows:

When the AC 220v is normal, the power supply unit converts the DC power supply +12v, +5v for the temperature controller to work, when the AC 220v loses power, the +12v, +5v disappears. When the power supply unit fails, +12v and +5v disappear simultaneously or individually. When +12v and +5v are normal, the triode D1 is saturated and turned on, the relay K is closed, the normally closed point of the relay is disconnected, and no signal is sent. When +12v and +5v disappear at the same time or one of them disappears, the triode D1 will be cut off, the relay K will be released, the normally closed point of the relay K will be closed, and a power failure alarm signal will be sent through the power failure alarm signal output terminals X1 and X2, and the power failure alarm will be activated. The signal can activate the audible and visual alarm device in the duty room to issue an audible and visual alarm, or trigger the comprehensive protector configured in the high-voltage cabinet to generate an alarm message, and notify the maintenance personnel on duty to deal with the fault in time.

In this way, the power failure alarm unit of the temperature controller is added on the basis of the original unit module. It finds the disappearance of +5v and +12v voltage through the voltage loss detection circuit to judge whether the temperature controller is power off, and through the power loss alarm signal output terminal X1 and X2 send out a power failure alarm signal, which can activate the sound and light alarm device in the duty room to issue a sound and light alarm, or trigger the comprehensive protector configured in the high-voltage cabinet to generate an alarm message, and notify the maintenance personnel on duty to deal with the fault in time, thereby avoiding The transformer is burned down, avoiding power outages and production shutdowns.

Claims (1)

1. have a temperature controller of dry type transformer for dead electricity warning function, it includes single-chip microcomputer (1), sensor (2), keyboard display unit (3), air-blower control unit (4), overtemperature alarm unit (5), overtemperature trip unit (6), fault alarm unit (7), these eight element circuits of power supply (8), wherein single-chip microcomputer (1) respectively with sensor (2), keyboard display unit (3), air-blower control unit (4), overtemperature alarm unit (5), overtemperature trip unit (6) is connected with fault alarm unit (7), and described power supply (8) connects with alternating current, converts alternating current to+5v, two direct supplys of+12v voltage export, wherein+5v power supply supply single-chip microcomputer (1) ,+12v power supply supply air-blower control unit (4), overtemperature alarm unit (5), overtemperature trip unit (6) and fault alarm unit (7), is characterized in that: this temperature controller of dry type transformer with dead electricity warning function also includes dead electricity alarm unit (9), described dead electricity alarm unit (9) respectively with the 5v of power supply (8), + 12v two direct supply output points are connected, and described dead electricity alarm unit (9) are connected to signal output terminal X1 and signal output terminal X2 to send dead electricity alerting signal,

The circuit of described dead electricity alarm unit (9) comprises resistance R1, resistance R2, triode D1, diode D2 and relay K, wherein+5v the output point of resistance R1 mono-termination power 8, the other end connects with the b pole of resistance R2 and triode D1, the other end of resistance R2 is connected in the negative pole "-" of direct supply, the positive pole of diode D2 connects the+12v output point of power supply 8, negative pole connects the c pole of triode D1, the e pole of triode D1 is connected in the negative pole "-" of direct supply, the coil of relay K is in parallel with diode D2, the normally closed point of relay K and the sub-X1 of dead electricity alarm signal output ends, X2 is connected.