CN112099551B - Transformer cooling control system - Google Patents
Transformer cooling control system Download PDFInfo
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- CN112099551B CN112099551B CN202011036067.2A CN202011036067A CN112099551B CN 112099551 B CN112099551 B CN 112099551B CN 202011036067 A CN202011036067 A CN 202011036067A CN 112099551 B CN112099551 B CN 112099551B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
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Abstract
The invention discloses a transformer cooling control system, which comprises: the fan control unit controls the fan to start or stop based on a control instruction of the PLC; the fault detection unit is used for detecting whether the fan control unit and the PLC are in fault in real time and conducting an alarm signaling unit when detecting that the fan control unit or the PLC is in fault; the emergency starting unit is used for forcibly starting the fan to cool the main transformer when the fan control unit or the PLC fails; the alarm transmitting unit is used for switching on the emergency starting unit when a fault occurs and transmitting alarm information to a monitoring personnel; and the PLC is used for sending a control instruction to the fan control unit. According to the transformer cooling control system, under the condition that double backup of the PLC is not increased, when the PLC breaks down, all fans are started in an emergency mode, and warning information is sent to prompt supervision personnel, so that the reliability of the transformer cooling control system is increased, and the control logic complexity is reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of transformers, in particular to a transformer cooling control system.
Background
The cooling control system of the main transformer of the traditional transformer substation adopts the relay to control the fan to start and stop, the relay type fan control system has complex loop wiring, poor reliability and large maintenance workload, particularly cannot adjust the cooling system on line, and gradually cannot adapt to the automatic development of the modern power grid. The novel main transformer cold control system based on a Programmable Logic Controller (PLC) can greatly simplify system wiring through a programming function, can also realize the functions of periodic cycle starting of fans, automatic alternation of main fans and standby fans, real-time online monitoring of a cooling system and the like, and reduces monthly periodic switching maintenance work of transformer substation operators on the fans.
However, after the main transformer cold control system adds a PLC controller, the risk of component failure of the PLC is also increased. After the PLC breaks down, the fan control system stops working completely, the main transformer cooling control system breaks down, the temperature of main transformer insulating oil and the temperature of a winding are continuously increased, the service life of a main transformer insulating material is shortened, and over-high temperature tripping is caused in severe cases to influence the reliable operation of a main transformer.
At present, the condition of failure is mainly dealt with through PLC double backup, and the method not only increases the cost, but also makes a loop and a control logic more complex.
Disclosure of Invention
The invention provides a transformer cooling control system, which can start all fans in an emergency manner and send alarm information to prompt supervision personnel when a PLC fails under the condition that double backup of the PLC is not increased, so that the reliability of the transformer cooling control system is increased, and the complexity of control logic is reduced.
The embodiment of the invention provides a transformer cooling control system, which comprises: the system comprises a PLC controller, a fan control unit, a fault detection unit, an emergency starting unit and an alarm signaling unit;
the fan control unit is respectively and electrically connected with a phase line of a first alternating current power supply, a zero line of the first alternating current power supply, the PLC, the emergency starting unit and the alarm signaling unit; the fan control unit controls the fan to start or stop based on a control instruction of the PLC;
the fault detection unit is respectively electrically connected with the PLC, the fan control unit, the emergency starting unit and a zero line of the first alternating current power supply, and is used for detecting whether the fan control unit and the PLC are in fault in real time and conducting the alarm signaling unit when detecting that the fan control unit or the PLC is in fault;
the emergency starting unit is respectively and electrically connected with a phase line of a first alternating current power supply, the fan control unit and the alarm signaling unit and is used for forcibly starting the fan to cool the main transformer when the fan control unit or the PLC fails;
the alarm transmitting unit is respectively and electrically connected with a phase line of a second alternating current power supply, a zero line of the second alternating current power supply and the emergency starting unit, and is used for switching on the emergency starting unit and transmitting alarm information to a supervision staff when the fault detection unit detects that the fan control unit or the PLC controller has a fault;
and the PLC is used for sending a control instruction to the fan control unit.
Furthermore, the alarm signaling unit comprises a first alternating current relay, an execution element of a first fan control relay, an execution element of a second fan control relay and an execution element of a delay relay which are connected in sequence;
the first end of the first alternating current relay is electrically connected with a phase line of the second alternating current power supply, and the second end of the actuating element of the time delay relay is electrically connected with a zero line of the second alternating current power supply.
Further, the emergency starting unit comprises a first actuator of a first alternating current relay;
a first end of a first execution element of the first alternating-current relay is electrically connected with a phase line of the first alternating-current power supply; and the second end of the first execution element of the first alternating current relay is electrically connected with the fan control unit.
Further, the fault detection unit includes: the delay relay;
the first end of the delay relay is electrically connected with the PLC, and the second end of the delay relay is electrically connected with a zero line of the first alternating current power supply.
Further, the alarm signaling unit also comprises a normally open contact of a temperature controller; and the first end of the normally open contact of the temperature controller is connected with the actuating element of the time delay relay in parallel.
Further, the alarm signaling unit further comprises a second execution element of the first alternating current relay and a first execution element of a second alternating current relay;
the first end of the second execution element of the first alternating current relay is electrically connected with the second end of the first alternating current relay, the second end of the second execution element of the first alternating current relay is electrically connected with the first end of the first execution element of the second alternating current relay, and the second end of the first execution element of the second alternating current relay is electrically connected with the zero line of the second alternating current power supply.
Further, still include: a third actuator of the first ac relay; and a third execution element of the first alternating current relay is electrically connected with a measurement and control screen of the main transformer.
Further, the fan control unit includes: the first fan control relay and the second fan control relay;
the first end of the first fan control relay and the first end of the second fan control relay are electrically connected with the PLC, and the second end of the first fan control relay and the second end of the second fan control relay are electrically connected with a zero line of the first alternating current power supply.
Further, the fan control unit further includes: the second alternating current relay and the cooling mode selection handle; the first end of the second alternating current relay is electrically connected with the phase line of the first alternating current power supply, the second end of the second alternating current relay is electrically connected with the first end and the second end of the cooling mode selection handle respectively, the third end of the cooling mode selection handle is electrically connected with the first fan control relay, and the fourth end of the cooling mode selection handle is electrically connected with the second fan control relay.
Further, the PLC is also used for obtaining a remote control signal and a thermometer signal and sending a control instruction to the fan control unit based on the remote control signal and the thermometer signal.
The invention discloses a transformer cooling control system, which comprises: the system comprises a PLC controller, a fan control unit, a fault detection unit, an emergency starting unit and an alarm signaling unit; the fan control unit controls the fan to start or stop based on a control instruction of the PLC; the fault detection unit is used for detecting whether the fan control unit and the PLC are in fault in real time and conducting an alarm signaling unit when detecting that the fan control unit or the PLC is in fault; the emergency starting unit is used for forcibly starting the fan to cool the main transformer when the fan control unit or the PLC fails; the alarm transmitting unit is used for switching on the emergency starting unit and transmitting alarm information to the monitoring personnel when the fault detection unit detects that the fan control unit or the PLC fails; the PLC is used for sending a control instruction to the fan control unit. According to the transformer cooling control system, under the condition that double backup of the PLC is not increased, when the PLC breaks down, all fans are started in an emergency mode, and warning information is sent to prompt supervision personnel, so that the reliability of the transformer cooling control system is increased, and the control logic complexity is reduced.
Drawings
Fig. 1 is a structural diagram of a fan control part of a transformer cooling control system according to an embodiment of the present invention;
FIG. 2 is a block diagram of an alarm signaling unit of a transformer cooling control system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a transformer cooling control system connected to a main transformer measurement and control screen according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.
Fig. 1 is a structural diagram of a fan control portion of a transformer cooling control system according to an embodiment of the present invention. Fig. 2 is a structural diagram of an alarm signaling unit of a transformer cooling control system according to an embodiment of the present invention.
As shown in fig. 1 to 2, the transformer cooling control system includes: a PLC controller 10, a fan control unit 20, a fault detection unit 30, an emergency starting unit 40 and an alarm signaling unit 50.
The fan control unit 20 is electrically connected with a phase line L1 of the first alternating current power supply, a zero line N1 of the first alternating current power supply, the PLC 10, the emergency starting unit 40 and the alarm signaling unit 50 respectively; the fan control unit 20 controls the fan to start or stop based on a control instruction of the PLC controller 10.
The fault detection unit 30 is electrically connected to the PLC controller 10, the fan control unit 20, the emergency start unit 40, and the zero line N1 of the first ac power supply, and is configured to detect whether the fan control unit 20 or the PLC controller 10 has a fault in real time, and activate when detecting that the fan control unit 20 or the PLC controller 10 has a fault, and turn on the alarm signaling unit 50.
The emergency starting unit 40 is electrically connected to a phase line L1 of the first ac power supply, the fan control unit 20, and the alarm signaling unit 50, respectively, and is configured to forcibly start the fan to cool the main transformer when the fan control unit 20 or the PLC controller 10 fails.
The alarm transmitting unit 50 is electrically connected to the phase line L2 of the second ac power supply, the zero line N2 of the second ac power supply, and the emergency starting unit 40, respectively, and is configured to turn on the emergency starting unit 40 and send alarm information to the supervisory personnel when the fault detection unit 30 detects that the fan control unit 20 or the PLC controller 10 has a fault.
The PLC controller 10 is configured to send a control instruction to the fan control unit 20.
Optionally, as shown in fig. 1, the PLC controller 10 is further configured to obtain a remote control signal and a thermometer signal, and send a control instruction to the fan control unit 20 based on the remote control signal and the thermometer signal.
Specifically, with reference to fig. 1-2, the PLC controller 10 is capable of acquiring a remote control signal and a thermometer signal, and sending a control instruction to the fan control unit 20 based on the acquired remote control signal and thermometer signal; after receiving the control instruction sent by the PLC controller 10, the fan control unit 20 controls the fan to cool down as a transformer; at this time, the fault detection unit 30 may detect whether the fan control unit 20 and the PLC controller 10 are faulty in real time, if the detection result is that the fan control unit 20 and/or the PLC controller 10 are faulty, the fault detection unit 30 is powered on, the alarm signaling unit 50 is turned on, and sends an alarm message to the monitoring system of the supervision personnel, where the alarm message is usually an alarm prompt signal to prompt the supervision personnel that the fan control unit 20 and/or the PLC controller 10 are faulty, and the supervision personnel receive the alarm message through the monitoring system and then notify the relevant operation and maintenance personnel to process the alarm message, and meanwhile, when the alarm signaling unit 50 is turned on, the emergency starting unit 40 is also turned on therewith, and forcibly starts the fan to cool the transformer.
It should be noted that the first ac power supply and the second ac power supply are usually the same ac power supply, but may also be set to different ac power supplies according to needs, and are not described herein again.
According to the method and the device, under the condition that double backup of the PLC is not increased, when the PLC breaks down, all fans are started in an emergency mode, warning information is sent to prompt workers, the reliability of a transformer cooling control system is increased, and the control logic complexity is reduced.
Alternatively, as shown in fig. 1, the failure detection unit 30 includes: a delay relay K12; a first end of the delay relay K12 is electrically connected with the PLC controller 10, and a second end of the delay relay K12 is electrically connected with the zero line N1 of the first ac power supply.
Specifically, the fault detection unit 30 is an ac time delay relay, and after the fan control unit 20 is activated, the time delay relay K12 is turned on for a preset time delay to monitor whether the fan control unit 20 and the PLC controller 10 are faulty, and the preset time delay can be set as required, and is usually set to 10 s.
Alternatively, as shown in fig. 1, the fan control unit 20 includes: a first fan control relay K3 and a second fan control relay K4; the first end of first fan control relay K3, the first end of second fan control relay K4 all are connected with PLC controller 10 electricity, and the second end of first fan control relay K3, the second end of second fan control relay K4 all are connected with first alternating current power supply's zero line N1 electricity.
Specifically, normally open auxiliary contacts (not shown in the drawings) of the first fan control relay K3 and the second fan control relay K4 are respectively connected in series in a power loop of the two groups of fans (i.e., the first fan and the second fan) and used for controlling the start and stop of the two groups of fans. With reference to fig. 1 and fig. 2, the PLC controller 10 controls the first fan control relay K3 and the second fan control relay K4 to operate according to the remote control signal and the thermometer signal, so as to control the start and stop of the two sets of fans respectively; it should be noted that the transformer cooling control system can control not only two sets of fans, but also multiple sets of fans as needed, and corresponding fan control relays are correspondingly added, which is not described herein again.
Optionally, as shown in fig. 2, the alarm signaling unit 50 includes a first ac relay K21, an actuator K3-1 of a first fan control relay K3, an actuator K4-1 of a second fan control relay K4, and an actuator K12-1 of a delay relay K12, which are connected in sequence; the first end of the first alternating current relay K21 is electrically connected with a phase line L2 of a second alternating current power supply, and the second end of an actuating element K12-1 of the time delay relay K12 is electrically connected with a zero line N2 of the second alternating current power supply.
Specifically, referring to fig. 1-2, the alarm signaling unit 50 includes a first ac relay K21, an actuator K3-1 of a first fan control relay K3, an actuator K4-1 of a second fan control relay K4, and an actuator K12-1 of a delay relay K12, which are connected in sequence, wherein the actuator K3-1 of the first fan control relay K3 and the actuator K4-1 of the second fan control relay K4 are both normally closed contacts, and the actuator K12-1 of the delay relay K12 is normally open contacts.
When the delay relay K12 in the fault detection unit 30 detects that a fault occurs in the fan control unit 20 or the PLC controller 10, the delay relay K12 operates, the normally open contact of the execution element K12-1 of the delay relay K12 in the alarm signaling unit 50 is closed, due to the fault, the normally closed contact of the execution element K3-1 of the first fan control relay K3 and the execution element K4-1 of the second fan control relay K4 cannot operate and be opened, at this time, the alarm signaling unit 50 is turned on, and the system sends alarm information to the monitoring system at the supervision personnel, where the alarm information is usually an alarm prompt signal to prompt the supervision personnel that the fan control unit 20 and/or the PLC controller 10 have the fault.
It should be noted that, the present application exemplarily provides a connection manner that the actuator K3-1 of the first fan control relay K3 and the actuator K4-1 of the second fan control relay K4 are connected in series, and in an actual application process, the actuator K3-1 of the first fan control relay K3 and the actuator K4-1 of the second fan control relay K4 may also be connected in parallel, and at this time, as long as one of the first fan control relay K3 and the second fan control relay K4 fails, the alarm signaling unit 50 is turned on; alternatively, only one of the actuator K3-1 of the first fan control relay K3 and the actuator K4-1 of the second fan control relay K4 is provided in the alarm signaling unit 50, and at this time, when the fan control relay corresponding to the actuator provided in the alarm signaling unit 50 fails, the alarm signaling unit 50 is turned on, which is not described herein again.
Alternatively, as shown in fig. 1, the emergency starting unit 40 comprises a first actuator K21-1 of a first ac relay K21; a first end of a first actuator K21-1 of the first alternating-current relay K21 is electrically connected with a phase line L1 of a first alternating-current power supply; the second end of the first actuator K21-1 of the first ac relay K21 is electrically connected to the fan control unit 20.
Specifically, with reference to fig. 1 and fig. 2, when a fault occurs, in a case where the alarm signaling unit 50 is turned on, the first ac relay K21 is powered on, at this time, the normally open contact of the first execution unit K21-1 of the first ac relay K21 in the emergency starting unit 40 is closed, the first fan control relay K3 and the second fan control relay K4 in the fan control unit 20 are communicated with the phase line L1 of the first ac power supply, the fan is forcibly started, and the transformer is cooled continuously during the fault.
Optionally, as shown in fig. 2, the alarm signaling unit 50 further comprises a normally open contact F834.1 of the temperature controller; the first end of the normally open contact F834.1 of the temperature controller is connected with an actuator K12-1 of a time delay relay K12 in parallel.
Specifically, in order to ensure that the main transformer can continuously operate as a cooling fan when needed, the alarm signaling unit 50 is further provided with a normally open contact F834.1 of a temperature controller, the temperature controller is a temperature controller of the main transformer insulating oil, in a normal case, when the temperature is within a preset range, the normally open contact F834.1 of the temperature controller does not operate, whether the alarm signaling unit 50 is turned on or not depends on the fault detection unit 30, but when the temperature controller detects that the temperature of the main transformer is too high, for example, the temperature of the main transformer is higher than 60 ℃, the normally open contact F834.1 of the temperature controller is closed, at this time, the alarm signaling unit 50 is turned on, the first ac relay K21 is powered on, the first execution element K21-1 of the first ac relay K21 in the emergency starting unit 40 is closed, the emergency starting unit 40 is turned on, and the fan is forcibly started.
It should be noted that, in this application, a normally open contact F834.1 of one temperature controller is exemplarily set, in practical application, in order to ensure the reliability of the control system, normally open contacts of a plurality of temperature controllers may also be set, the normally open contacts all adopt a form of being connected in parallel with an execution element K12-1 of a time delay relay K21, and as long as one temperature controller detects that the oil temperature reaches a preset temperature, one of the normally open contacts is closed, and the fan is started.
It should be noted that the normally open contact F834.1 of the temperature controller in the present application is a normally open contact of the insulating oil temperature controller, and in the practical application process, the normally open contact of the winding temperature controller can be used instead of the normally open contact of the insulating oil temperature controller as needed.
By arranging the normally open contact F834.1 of the temperature controller in the alarm transmitting unit 50, double guarantee is provided for the transformer cooling control system, and the reliability of the transformer cooling control system is improved.
Optionally, as shown in fig. 1, the fan control unit 20 further includes: a second ac relay K22 and a cooling mode selection handle 60; a first end of the second ac relay K22 is electrically connected to a phase line L1 of the first ac power source, a second end of the second ac relay K22 is electrically connected to a first end 1 and a second end 2 of the cooling mode selection handle 60, a third end 3 of the cooling mode selection handle 60 is electrically connected to the first fan control relay K3, and a fourth end 4 of the cooling mode selection handle 60 is electrically connected to the second fan control relay K4.
Specifically, the cooling mode selection handle 60 includes an automatic mode and a manual mode, when the supervisory personnel receives the alarm information, the supervisory personnel is notified that the supervisory personnel arrives at the site for accident handling, the cooling mode selection handle 60 is switched to the manual mode, all fans can be started when the cooling mode selection handle is switched to the manual mode, namely, the cooling mode selection handle 60 is closed, the first fan control relay K3 and the second fan control relay K4 are kept communicated with the phase line L1 of the first alternating current power supply, and at the moment, the second alternating current relay K22 is powered on.
Optionally, as shown in fig. 2, the alarm signaling unit 50 further comprises a second actuator K21-2 of the first ac relay K21 and a first actuator K22-1 of the second ac relay K22; the first end of the second actuator K21-2 of the first AC relay K21 is electrically connected with the second end of the first AC relay K21, the second end of the second actuator K21-2 of the first AC relay K21 is electrically connected with the first end of the first actuator K22-1 of the second AC relay K22, and the second end of the first actuator K22-1 of the second AC relay K22 is electrically connected with the neutral line N2 of the second AC power supply.
Specifically, the second actuator K21-2 of the first AC relay K21 and the first actuator K22-1 of the second AC relay K22 in the alarm signaling unit 50 constitute a self-sustaining circuit. When a fault occurs, the first alternating current relay K21 is electrified, the normally open contact of the second executive component K21-2 of the first alternating current relay K21 is closed, at the moment, the normally closed contact of the executive component K22-1 of the second alternating current relay K22 does not act, the self-holding loop is conducted, and the continuous conduction of the emergency starting unit 40 is ensured.
When the operation and maintenance personnel arrive at the site to process the fault, after the cooling mode selection handle 60 is switched to the manual mode and the second alternating current relay K22 is powered on, the normally closed contact of the first executive component K22-1 of the second alternating current relay K22 in the alarm signaling unit 50 is opened, the self-holding loop and the alarm signaling loop in the alarm signaling unit 50 are cut off, the first alternating current relay K21 is powered off, the first executive component K21-1 of the first alternating current relay K21 in the emergency starting unit 40 is opened, and therefore the signal is restored.
Fig. 3 is a schematic diagram of a transformer cooling control system connected to a main transformer measurement and control screen according to an embodiment of the present invention.
Optionally, as shown in fig. 3, the transformer cooling control system further includes: a third actuator K21-3 of the first AC relay K21; the third actuator K21-3 of the first ac relay K21 is electrically connected to a measurement and control panel of the main transformer (the main transformer measurement and control panel is not shown in fig. 3).
Specifically, the transformer cooling control system is further electrically connected with the signal input terminal row of the main transformer measurement and control screen through a third execution element K21-3 of the first ac relay K21, and a main transformer measurement and control device is installed in the measurement and control screen of the main transformer and used for monitoring the working state of the transformer cooling control system in real time.
The transformer cooling control system provided by the present application is specifically described below with reference to fig. 1 to 3.
For example, referring to fig. 1-3, in a normal situation, after the temperature of the main transformer insulating oil reaches the fan starting temperature, the PLC controller 10 outputs an electrical signal to the first fan control relay K3 and the second fan control relay K4 normally to start the fan, and at this time, the normally closed contacts of the actuator K3-1 of the first fan control relay K3 and the actuator K4-1 of the second fan control relay K4 are opened to simultaneously cut off the alarm signaling unit 50, so that no "cooler power failure" alarm signal is sent to the monitoring system at the supervision panel.
When the PLC controller 10 fails, or when the first fan control relay K3 and the second fan control relay K4 fail at the same time, the normally closed contacts of the actuator K3-1 of the first fan control relay K3 and the actuator K4-1 of the second fan control relay K4 cannot cut off the alarm signaling unit 50, and at the same time, the delay relay K12 in the fault detection unit 30 operates, the normally open contact of the actuator K12-1 of the delay relay K12 is closed, the alarm signaling unit 50 is turned on, and the upper measurement and control device connected to the alarm signaling loop starts a "cooler power failure" alarm signal, that is, sends alarm information to the monitoring system at the supervision personnel.
Or, when the starting temperature of the fan is reached, for example, when the temperature of the main transformer insulating oil is higher than 60 ℃, the temperature controller acts, the normally open contact F834.1 of the temperature controller is closed, the alarm transmitting unit 50 is turned on, and the superior measurement and control device connected with the alarm transmitting loop starts a "cooler power failure" alarm signal, that is, sends alarm information to the monitoring system at the supervision personnel.
When the alarm signaling unit 50 is turned on, the first alternating current relay K21 is powered on, the normally open contact of the first execution element K21-1 of the first alternating current relay K21 is closed, that is, the emergency starting unit 40 is turned on, and the first fan control relay K3 and the second fan control relay K4 are powered on to forcibly start all the cooler fans of the main transformer. When operation and maintenance personnel arrive at the site for accident treatment, the cooling mode selection handle 60 is switched to the manual mode, the second alternating current relay K22 is electrified, the normally closed contact of the execution element K22-1 of the second alternating current relay K22 is disconnected, the self-holding loop and the alarm loop where the first alternating current relay K21 is located are cut off, and therefore signals are restored.
It should be noted that, because the emergency starting unit 40 is connected to all the fan control relays in the fan control unit 20, when the emergency starting unit 40 is turned on, all the fans in the main transformer cooling system are forcibly started, and in the actual application process, the emergency starting unit 40 can be connected to one or some of the fan control units 20 as needed, so that only part of the fans need to be started to perform emergency cooling on the main transformer when a fault occurs, which not only ensures continuous cooling of the transformer, but also saves energy and reduces cost.
Through using the transformer cooling control system that this application provided, can be under the condition that does not increase the two spares of PLC controller, when the unable normal start fan of PLC controller trouble, control system can emergent start all cooling blower to send warning message suggestion supervision personnel, not only increased transformer cooling control system's reliability, reduced control logic complexity, still avoided main transformer body temperature to last the risk that risees, improved the reliability of main transformer long-term operation.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A transformer cooling control system, comprising: the system comprises a PLC controller, a fan control unit, a fault detection unit, an emergency starting unit and an alarm signaling unit;
the fan control unit is respectively and electrically connected with a phase line of a first alternating current power supply, a zero line of the first alternating current power supply, the PLC, the emergency starting unit and the alarm signaling unit; the fan control unit controls the fan to start or stop based on a control instruction of the PLC;
the fault detection unit is respectively electrically connected with the PLC, the fan control unit, the emergency starting unit and a zero line of the first alternating current power supply, and is used for detecting whether the fan control unit and the PLC are in fault in real time and conducting the alarm signaling unit when detecting that the fan control unit or the PLC is in fault;
the emergency starting unit is respectively and electrically connected with a phase line of a first alternating current power supply, the fan control unit and the alarm signaling unit and is used for forcibly starting the fan to cool the main transformer when the fan control unit or the PLC fails;
the alarm transmitting unit is respectively and electrically connected with a phase line of a second alternating current power supply, a zero line of the second alternating current power supply and the emergency starting unit, and is used for switching on the emergency starting unit and transmitting alarm information to a supervision staff when the fault detection unit detects that the fan control unit or the PLC controller has a fault;
the PLC is used for sending a control instruction to the fan control unit;
the alarm signaling unit comprises a first alternating current relay, an execution element of a first fan control relay, an execution element of a second fan control relay and an execution element of a delay relay which are sequentially connected;
the first end of the first alternating current relay is electrically connected with a phase line of the second alternating current power supply, and the second end of the actuating element of the time delay relay is electrically connected with a zero line of the second alternating current power supply.
2. The control system of claim 1, wherein the emergency start unit comprises a first actuator of a first ac relay;
a first end of a first execution element of the first alternating-current relay is electrically connected with a phase line of the first alternating-current power supply; and the second end of the first execution element of the first alternating current relay is electrically connected with the fan control unit.
3. The control system according to claim 1, wherein the failure detection unit includes: the delay relay;
the first end of the delay relay is electrically connected with the PLC, and the second end of the delay relay is electrically connected with a zero line of the first alternating current power supply.
4. The control system of claim 1, wherein said alarm signaling unit further comprises a normally open contact of a temperature controller; and the first end of the normally open contact of the temperature controller is connected with the actuating element of the time delay relay in parallel.
5. The control system of claim 1, wherein the alarm signaling unit further comprises a second actuator of the first ac relay and a first actuator of a second ac relay;
the first end of the second execution element of the first alternating current relay is electrically connected with the second end of the first alternating current relay, the second end of the second execution element of the first alternating current relay is electrically connected with the first end of the first execution element of the second alternating current relay, and the second end of the first execution element of the second alternating current relay is electrically connected with the zero line of the second alternating current power supply.
6. The control system of claim 1, further comprising: a third actuator of the first ac relay; and a third execution element of the first alternating current relay is electrically connected with a measurement and control screen of the main transformer.
7. The control system of claim 5, wherein the fan control unit comprises: the first fan control relay and the second fan control relay;
the first end of the first fan control relay and the first end of the second fan control relay are electrically connected with the PLC, and the second end of the first fan control relay and the second end of the second fan control relay are electrically connected with a zero line of the first alternating current power supply.
8. The control system of claim 7, wherein the fan control unit further comprises: the second alternating current relay and the cooling mode selection handle; the first end of the second alternating current relay is electrically connected with the phase line of the first alternating current power supply, the second end of the second alternating current relay is electrically connected with the first end and the second end of the cooling mode selection handle respectively, the third end of the cooling mode selection handle is electrically connected with the first fan control relay, and the fourth end of the cooling mode selection handle is electrically connected with the second fan control relay.
9. The control system of claim 1, wherein the PLC controller is further configured to obtain a remote control signal and a thermometer signal, and send a control command to the fan control unit based on the remote control signal and the thermometer signal.
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| JP7323236B2 (en) * | 2021-02-20 | 2023-08-08 | 西安亜能電気有限責任公司 | Monitoring components, monitoring devices and monitoring models for fans on power systems |
| TWI811154B (en) * | 2022-11-11 | 2023-08-01 | 群光電能科技股份有限公司 | Rack with heat-dissipation system, power supply system for rack with heat-dissipation system, and power control system of rack heat-dissipation system |
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| CN2666027Y (en) * | 2003-12-24 | 2004-12-22 | 北京利德华福电气技术有限公司 | High-pressure large power frequency converter with double heat radiation fans system |
| CN201503749U (en) * | 2009-09-08 | 2010-06-09 | 新疆特变（集团）有限公司 | Modular intelligent transformer cooling control device |
| CN202205070U (en) * | 2011-08-10 | 2012-04-25 | 陕西金源自动化科技有限公司 | Intelligent transformer cooling control device |
| CN202285093U (en) * | 2011-10-11 | 2012-06-27 | 保定天威恒通电气有限公司 | Control and information display device for transformer cooling control system |
| CN202404420U (en) * | 2011-11-15 | 2012-08-29 | 保定变压器配件有限公司 | Power transformer intelligent frequency conversion air cooling control device |
| CN102710026B (en) * | 2012-06-15 | 2014-07-23 | 广州市韬宝科技有限公司 | Remote power utilization management system |
| CN104122790B (en) * | 2013-04-27 | 2016-08-17 | 杭州市电力局 | Cooling system |
| CN104932403B (en) * | 2015-05-15 | 2017-12-05 | 国家电网公司 | A kind of energy-saving control method for being applied to 220kV and above main transformer cooler |
| CN205427651U (en) * | 2016-03-17 | 2016-08-03 | 保定市瑞高电气有限公司 | Novel intelligent transformer forced air cooling switch board |
| CN207074378U (en) * | 2017-05-26 | 2018-03-06 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of PLC failures based on PLC transformer cooler control systems are met an urgent need module |
| CN208076993U (en) * | 2018-04-08 | 2018-11-09 | 中国南方电网有限责任公司超高压输电公司曲靖局 | A kind of transformer cooler frequency conversion fan PLC control system |
| CN110161955B (en) * | 2019-05-31 | 2024-02-02 | 广东电网有限责任公司 | Transformer cooling box PLC fault emergency processing method and normally open relay |
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