CN117833757B - Control device and method for power transformer cooler - Google Patents
Control device and method for power transformer cooler Download PDFInfo
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- CN117833757B CN117833757B CN202410252735.7A CN202410252735A CN117833757B CN 117833757 B CN117833757 B CN 117833757B CN 202410252735 A CN202410252735 A CN 202410252735A CN 117833757 B CN117833757 B CN 117833757B
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- 238000012546 transfer Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a control device and a control method of a power transformer cooler, comprising an execution circuit and a control circuit, wherein the execution circuit is used for providing two paths of three-phase power for the cooler, the control circuit is used for a logic control interface of the cooler to realize intelligent control of the cooler, and a dual-power control actuator can increase the reliability and stability of the whole system and standardization in maintenance. The cooler dual-power actuator is selected for each group of coolers, so that each group of coolers is provided with a group of dual-power switching loops, the independence of power supplies of the coolers is guaranteed, the problem that all the coolers share one dual-power switching loop in the past is solved, or when the devices are replaced in an electrified mode, the power supply is not thrown due to the fact that the devices are involved in tight connection with other loops, the fault of complete stop of the coolers is caused, and the risk of major accidents caused by tripping of a transformer is caused.
Description
Technical Field
The invention relates to the technical field of automatic control of power transformer coolers, in particular to a control device and a control method of a power transformer cooler.
Background
At present, the coolers of domestic transformers all use alternating current contactors as main power executing devices, and all the coolers share a double-power switching circuit, so that the contactors of the double-power switching circuit bear large current and are easy to generate heat, thereby causing high failure rate, and when the failure needs to be replaced, the close connection with other circuits is involved, so that the complete stop of the coolers is easy to cause major accidents due to the tripping of the transformer; in the overhaul process, a great deal of time is spent, and the power failure operation is needed in the aspect of replacing devices, so that a plurality of problems such as inconvenience are brought to maintenance personnel.
The control of the traditional cooler is that all control elements of the cooler mainly comprise a circuit breaker, a contactor, a thermal relay, a relay and the like, the control elements are placed in a control cabinet with huge volume, the control cabinet is placed in disorder, the power supplies of all the coolers share one path, and when the power supply of the path is switched, the air cooling is stopped completely, so that accidents are caused. And the internal wiring is extremely complicated, electromagnetic interference is extremely easy to generate, and when faults occur, the lines are mutually connected and must be replaced in a power failure, so that a plurality of inconveniences are brought to maintainers.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a control device and a control method for a power transformer cooler, wherein a dual power supply switching loop is integrated into an actuator and is used for replacing a traditional contactor type actuator.
According to a first aspect of an embodiment of the present invention, there is provided a control device of a power transformer cooler, including an execution circuit and a control circuit;
The execution circuit comprises a first air switch ZK1 and a second air switch ZK2 which are connected by two paths of three-phase power supplies; the first air switch ZK1 and the second air switch ZK2 are connected with a cooler, a first three-phase switching switch 1C and a second three-phase switching switch 2C are respectively arranged between the cooler and the first air switch ZK1 and the second air switch ZK2, and a cooler soft start unit RQD is arranged between the AB phases of the first three-phase switching switch 1C and the second three-phase switching switch 2C and the cooler;
The control circuit comprises a direct current power supply, a first relay K1, a second relay K2, a third relay K3, a fourth relay K4, a fifth relay K5 and a change-over switch KK which are connected to the PCB;
The normally open contact 2 pins of the third relay K3 and the fourth relay K4 are connected with the normally open contact 1 pin of the second relay K2, the ST end of the cooler soft start unit RQD is connected with the normally open contact 2 pin of the second relay K2, and the RUN end of the cooler soft start unit RQD is respectively connected with the coil 7 pin of the first relay K1, the capacitor C and the fourth indicator lamp HF 4;
The transfer switch KK is respectively connected with the auxiliary contact 3 pins of the first three-phase switching switch 1C and the second three-phase switching switch 2C; the auxiliary contact 4 pins of the first three-phase switching switch 1C and the second three-phase switching switch 2C are respectively connected with the 7 pins of the third relay K3 coil and the fourth relay K4 coil;
The auxiliary contact 2 pin of the second three-phase switching switch 2C is respectively connected with the normally open contact 3 pin of the third relay K3 and the normally open contact 3 pin of the first relay K1, and the normally open contact 4 pin of the third relay K3 and the normally open contact 4 pin of the first relay K1 are connected with the coil 7 pin of the first three-phase switching switch 1C; the auxiliary contact 2 pin of the first three-phase switching switch 1C is respectively connected with the normally open contact 1 pin of the first relay K1 and the normally open contact 1 pin of the fourth relay K4, and the normally open contact 2 pin of the first relay K1 and the normally open contact 4 pin of the fourth relay K4 are connected with the coil 7 pin of the second three-phase switching switch 2C;
The positive pole of the direct current power supply is respectively connected with the 1 pin of the normally open contact of the third relay K3, the fourth relay K4 and the fifth relay K5, the 1 pin of the normally closed contact of the first three-phase switching switch 1C and the second three-phase switching switch 2C, and the 3 pin of the change-over switch KK is connected with the 7 pin;
The negative pole of the direct current power supply is respectively connected with 8 pins of coils of the first relay K1, the third relay K3, the fourth relay K4 and the fifth relay K5; the 8 pins of the coils of the first three-phase switching switch 1C and the second three-phase switching switch 2C are connected with the negative electrode of the capacitor C.
Preferentially, the direct current power supply is formed by connecting a three-phase power supply connected with an AC phase of the first air switch ZK1 and the second air switch ZK2 in parallel through the first disconnecting switch power supply P1 and the second disconnecting switch power supply P2, and the first disconnecting switch power supply P1 and the second disconnecting switch power supply P2 are connected into a whole.
Preferentially, the lower ends of the first air switch ZK1 and the second air switch ZK2 are respectively connected with a first power supply monitoring unit QX1 and a second power supply monitoring unit QX2 for detecting power supply.
Preferably, a thermal relay KH is connected between the C phase of the first three-phase switching switch 1C and the a phase of the second three-phase switching switch 2C.
Preferentially, the 1 pin of the change-over switch KK is respectively connected with the 4 end of the J6 terminal and the 2 pin of the normally open contact of the fifth relay K5, the 1 pin of the normally open contact of the fifth relay K5 is connected with the positive electrode end of the direct current power supply, and the 4 end of the J6 terminal is used for inputting a three-phase power input signal connected with the first open ZK 1;
The 5 pin of the change-over switch KK is respectively connected with the 5 end of the J6 terminal and the normally open contact 4 pin of the fifth relay K5, the normally open contact 3 pin of the fifth relay K5 is connected with the 6 pin of the first power supply monitoring unit QX1, the 5 pin of the first power supply monitoring unit QX1 is connected with the positive electrode end of the direct current power supply, and the 5 end of the J6 terminal is used for inputting a three-phase power supply input signal connected with the second open ZK 2;
the 3 pin and the 7 pin of the change-over switch KK are respectively connected with the positive pole end of the direct current power supply;
The pin 2 of the transfer switch KK is connected with the pin 3 of the first power supply monitoring unit QX 1; the pin 4 of the first power supply monitoring unit QX1 and the pin 4 of the change-over switch KK are respectively connected with the pin 3 of the auxiliary contact of the second three-phase switching switch 2C;
the 6 pin of the change-over switch KK is connected with the 3 pin of the second power supply monitoring unit QX 2; the pin 4 of the second power supply monitoring unit QX2 and the pin 8 of the changeover switch KK are connected with the auxiliary contact 3 pin of the first three-phase switching switch 1C, respectively.
Preferentially, the positive terminals of the first isolation switch power supply P1 and the second isolation switch power supply P2 in the direct current power supply are connected with a first diode D1 and a second diode D2, and the first diode D1 and the second diode D2 are connected in series with a safety F3.
Preferably, a6 end of a J6 terminal is arranged between the positive electrode end and the negative electrode end of the direct current power supply, and the 6 end of the J6 terminal is used for inputting fault signals of other controllers.
Preferentially, the positive terminal of the direct current power supply is connected with the 1 end and the 2 end of the J6 terminal, the negative terminal of the direct current power supply is connected with the 3 end of the J6 terminal, the 1 end and the 2 end of the J6 terminal are used for inputting common signals, and the 3 end of the J6 terminal is used for inputting cooler fault signals.
A control method of a control device of a power transformer cooler, comprising:
When the control change-over switch is switched to the manual control I position, pins 3 and 4 of the change-over switch KK are conducted, a coil of the third relay K3 is electrically attracted through a normally closed contact of the three-phase switching switch 2C, all contact pins of the third relay K3 are conducted, a coil of the first three-phase switching switch 1C is conducted through normally closed contacts 1 and 2 pins of the second three-phase switching switch 2C, a normally open contact pin 3 and 4 pins of the third relay K3 are conducted to be electrically attracted, and at the moment, a first idle switch ZK1 connected with a three-phase power supply is opened to supply power for a cooler;
When the control change-over switch is switched to the manual control II position, pins 7 and 8 of the change-over switch KK are conducted, a coil of the fourth relay K4 is electrically attracted through a normally closed contact of the three-phase switching switch 1C, all contact pins of the fourth relay K4 are conducted, a coil of the second three-phase switching switch 2C is conducted through normally closed contacts 1 and 2 pins of the first three-phase switching switch 1C, normally open contact pins 3 and 4 pins of the fourth relay K4 are conducted to be electrically attracted, and a second empty switch ZK2 connected with a three-phase power supply is started to supply power for the cooler;
When the change-over switch KK is controlled to be switched to an automatic control position, the 1 foot and the 2 foot of the change-over switch KK are conducted, the 5 foot and the 6 foot of the change-over switch KK are conducted, at the moment, the 1 end or the 2 end of the J6 terminal is in short circuit with the 4 end of the J6 terminal, at the moment, a dry node signal is output to be started in the first empty switch ZK1 or the second empty switch ZK2 is input through a control signal, the 1 foot and the 2 foot of the change-over switch KK are conducted with the 3 foot and the 4 foot of the first power supply monitoring unit QX1 through the 3 foot and the 4 foot of the second three-phase switch 2C, all contact feet of the third relay K3 are conducted, the first three-phase switch 1C coil is conducted through normally closed contacts 1 and 2 feet of the second three-phase switch 2C, at the moment, the normally open contact 3 foot and the 4 foot of the third relay K3 are conducted to be electrically sucked, at the moment, the first empty switch ZK1 or the second empty switch ZK2 is connected, and the three-phase power supply on the first empty switch ZK1 or the second empty switch ZK2 is connected.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
The direct start of the motor is changed into soft start, so that impact of starting current on a power grid can be reduced. The relay is used for replacing the contactor, the defect that the relay has no arc extinguishing function can be overcome through the control logic, the double-power switching and soft start bypass can be executed, the size of the controller can be greatly reduced, and the cost is greatly saved. The actuator can ensure uninterrupted operation of the transformer and avoid error tripping accidents caused by faults of the cooling actuator. Solves the problems that spare parts can not be replaced in an electrified way and the replacement time is long.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic diagram of an implementation circuit in a control device for a power transformer cooler according to the present invention;
FIG. 2 is a schematic diagram of a control circuit in a control device for a power transformer cooler according to the present invention;
FIG. 3 is a schematic diagram showing the switching operation of the switch KK according to the embodiment of the present invention;
Fig. 4 is a schematic diagram of a connection circuit of the J7 terminal in the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention.
Examples
The control device of the power transformer cooler shown in fig. 1 comprises an execution circuit and a control circuit;
The execution circuit comprises a first air switch ZK1 and a second air switch ZK2 which are connected by two paths of three-phase power supplies; the first air switch ZK1 and the second air switch ZK2 are connected with the cooler to provide a three-phase power supply for the cooler; the specific execution circuit is provided with two paths of high-current PCB welding terminals J9 (A/B/C) and welding terminals J10 (A/B/C), wherein the welding terminals J9 (A/B/C) and J10 (A/B/C) are used as inlet wire terminals of a three-phase dual power supply and then are respectively connected to inlet wire ends of a first air switch ZK1 and a second air switch ZK2;
a first three-phase switching switch 1C and a second three-phase switching switch 2C are respectively arranged between the cooler and the first air switch ZK1 and the second air switch ZK2, and a cooler soft start unit RQD is arranged between the AB phases of the first three-phase switching switch 1C and the second three-phase switching switch 2C and the cooler; when the device is arranged, the lower ends of the first air switch ZK1 and the second air switch ZK2 are respectively connected to the input ends of the first three-phase switching switch 1C and the second three-phase switching switch 2C, the AB phases of the first three-phase switching switch 1C and the second three-phase switching switch 2C are respectively connected into a cooler soft start unit RQD (soft start control is realized by adopting a microcontroller and electronic circuit design and a software programming mode), the output ends of the cooler soft start unit RQD are connected to the U/V end of the welding terminal J8 (U/V/W), the C phases of the first three-phase switching switch 1C and the second three-phase switching switch 2C are connected to the W end of the welding terminal J8 (U/V/W) of the PCB, and therefore, the device can realize a soft start function by controlling any two phases in ABC phase, and compared with controlling three phases, space and components can be saved. Meanwhile, the C-phase after parallel connection is connected with one end of a coil AC230V of an alternating current second relay K2 through a fuse F2, and the other end of the coil AC230V is connected with the 2 end of a J5 terminal through a resistor; the A phase is connected with the 1 end of the J5 terminal through the fuse F1 and the resistor, wherein the J5 terminal is a PCB welding terminal and is used for being connected with a normally closed signal of a thermal relay of a cooler protection device, and the normally closed two sides are respectively connected with the 1 end and the 2 end; the J8 terminal is connected to the cooler.
The control circuit shown in fig. 2 comprises a direct current power supply, a first relay K1, a second relay K2, a third relay K3, a fourth relay K4, a fifth relay K5 and a change-over switch KK which are connected to a PCB board; all the components are welded on the PCB and integrated into an integral structural module, so that the space is effectively saved;
The direct-current power supply is formed by connecting a three-phase power supply connected with an AC phase of a first air switch ZK1 and a second air switch ZK2 in parallel through a first isolating switch power supply P1 and a second isolating switch power supply P2, wherein the first isolating switch power supply P1 and the second isolating switch power supply P2 are connected into a whole; the first air switch ZK1 is connected with a first power supply monitoring unit QX1 through an insurance FIA, an insurance FIB and an insurance FIC respectively, the second air switch ZK2 is connected with a second power supply monitoring unit QX2 through an insurance FID, an insurance FIE and an insurance FIF respectively, the first power supply monitoring unit QX1 and the second power supply monitoring unit QX2 adopt analog circuits and digital circuit design and have undervoltage, overvoltage, phase interruption and reverse phase protection function units, and meanwhile, the AC phases of three-phase power supplies introduced by the first air switch ZK1 and the second air switch ZK2 are respectively connected with 90-512VAC to DC24V to form a first isolation switch power supply P1 and a second isolation switch power supply P2, so that the power supply reliability of other circuits is ensured;
When in connection, the positive electrode end of the direct current power supply (24V) is respectively connected with the 1 pin of the normally open contact of the third relay K3, the fourth relay K4 and the fifth relay K5 through a safety F3, and specifically: the positive ends of the first isolation switch power supply P1 and the second isolation switch power supply P2 in the direct current power supply are connected with a first diode D1 and a second diode D2, and the first diode D1 and the second diode D2 are connected in series with a safety F3; the power supply control circuit comprises a first power supply monitoring unit QX1, a second power supply monitoring unit QX2, a first three-phase switching switch 1C and a second three-phase switching switch 2C, wherein a pin 1 of a normally closed contact of the first power supply monitoring unit QX1, a pin 5 of another normally closed contact of the first power supply monitoring unit QX1, a pin 3 and a pin 7 of a change-over switch KK, and a terminal 1 and a terminal 2 of a J6 terminal, wherein the terminal J6 is a PCB welding terminal and is used for receiving signals or control commands sent by a PLC or other controllers; the 1 and 2 ends are the common end (24 V+); 3 end cooler fault indicator light signal; the 4 end inputs the I-section power supply command; 5, switching in a power command of the section II; the 6 end is a fault signal of a PLC or other controllers, and the fault signal of the PLC or other controllers is represented by QM-Q1;
After the normally open contact 1 pin and the normally open contact 2 pin of the third relay K3 and the normally open contact 2 pin of the fourth relay K4 are connected in parallel, the normally open contact 2 pin of the third relay K3 and the normally open contact 1 pin of the fourth relay K4 are connected in series with the normally open contact 1 pin of the second relay K2, the ST end of the cooler soft start unit RQD is connected with the normally open contact 2 pin of the second relay K2, and the RUN end of the cooler soft start unit RQD is respectively connected with the coil 7 pin of the first relay K1, the capacitor C and the fourth indicator lamp HF 4; wherein the chiller soft start unit RQD: the power supply is formed by lap joint design of a singlechip, other electronic components such as a resistor and a capacitor and power electronic components such as a silicon controlled rectifier, and is realized through MCU programming, and the starting and bypass are realized. The ST end is connected with 24V+ and started, and the ST end is disconnected and stopped; the RUN port outputs 24V after start-up, otherwise the voltage is zero.
The transfer switch KK is respectively connected with the auxiliary contact 3 pins of the first three-phase switching switch 1C and the second three-phase switching switch 2C; the auxiliary contact 4 pins of the first three-phase switching switch 1C and the second three-phase switching switch 2C are respectively connected with the 7 pins of the third relay K3 coil and the fourth relay K4 coil; each group of the first three-phase switching switch 1C and the second three-phase switching switch 2C consists of three high-power relays and 1 signal relay, the three high-power relays are welded on a PCB, the high-power relays are responsible for outputting three-phase power to a load end, the signal relays are used for double-power switching interlocking, namely, the contacts of the signal relays are auxiliary contacts of the first three-phase switching switch 1C or the second three-phase switching switch 2C;
The 1 pin of the change-over switch KK is connected with the 4 end of the J6 terminal and the 2 pin of the normally open contact of the fifth relay K5 respectively; the J6 terminal is connected with the I-section power input signal unit KD 1;
The 5 pin of the change-over switch KK is respectively connected with the 5 end of the J6 terminal and the 4 pin of the normally open contact of the fifth relay K5; the normally open contact 3 pin of the fifth relay K5 is connected with the 6 pin of the first power supply monitoring unit QX1, the J6 terminal is connected with the II-stage power input signal unit KD2, and the 5 pin of the first power supply monitoring unit QX1 is connected with the positive electrode end of the direct current power supply;
the 3 pin and the 7 pin of the change-over switch KK are respectively connected with the positive pole end of the direct current power supply;
The pin 2 of the transfer switch KK is connected with the pin 3 of the first power supply monitoring unit QX 1; the pin 4 of the first power supply monitoring unit QX1 and the pin 4 of the change-over switch KK are respectively connected with the pin 3 of the auxiliary contact of the second three-phase switching switch 2C; the pin 4 of the auxiliary contact of the second three-phase switching switch 2C is connected with the pin 7 of the coil of the third relay K3;
The 6 pin of the change-over switch KK is connected with the 3 pin of the second power supply monitoring unit QX 2; the pin 4 of the second power supply monitoring unit QX2 and the pin 8 of the change-over switch KK are respectively connected with the pin 3 of the auxiliary contact of the first three-phase switching switch 1C; the auxiliary contact 4 pin of the first three-phase switching switch 1C is connected with the 7 pin of the fourth relay K4 coil;
In the embodiment, the first power supply monitoring unit QX1 and the second power supply monitoring unit QX2 are formed by overlapping a singlechip with other electronic components such as a resistor and a capacitor, and are realized through programming of an MCU, when each section of power supply is normal, the relays of the first power supply monitoring unit QX 1/the second power supply monitoring unit QX2 respectively act and absorb and output, and when any one of open-phase, reverse-phase and three-phase imbalance occurs in each section of power supply, the relays of the first power supply monitoring unit QX 1/the second power supply monitoring unit QX2 lose magnetism and release;
the contact 2 pin of the first power supply monitoring unit QX1 is connected with the 1 pin of the indicator lamp HF1, the contact 1 pin of the first power supply monitoring unit QX1 is connected with the positive electrode of the direct current power supply, and the 2 pin of the indicator lamp HF1 is connected with the negative electrode of the direct current power supply;
The contact 2 pin of the second power supply monitoring unit QX2 is connected with the 1 pin of the indicating lamp HF2, the contact 1 pin of the second power supply monitoring unit QX2 is connected with the positive electrode of the direct current power supply, and the 2 pin of the indicating lamp HF2 is connected with the negative electrode of the direct current power supply;
the positive end of the direct current power supply is connected with the 1 end and the 2 end of the J6 terminal, the negative electrode of the direct current power supply is connected with the 3 end of the J6 terminal, the 1 end and the 2 end of the J6 terminal are used for inputting public signals, the 3 end of the J6 terminal is used for inputting cooler fault signals KD3, and the 3 end of the J6 terminal is connected with the 1 pin of the HF3 indicator lamp.
The auxiliary contact 2 pin of the second three-phase switching switch 2C is connected with the normally open contact 3 pin of the first relay K1 and the normally open contact 3 pin of the third relay K3 respectively, and the normally open contact 4 pin of the first relay K1 and the normally open contact 4 pin of the third relay K3 are connected with the coil 7 pin of the first three-phase switching switch 1C and the indicator lamp XD 1;
The auxiliary contact 2 pin of the first three-phase switching switch 1C is respectively connected with the normally open contact 1 pin of the first relay K1 and the normally open contact 1 pin of the fourth relay K4, and the normally open contact 2 pin of the first relay K1 and the normally open contact 4 pin of the fourth relay K4 are connected with the coil 7 pin of the second three-phase switching switch 2C and the indicator lamp XD 2;
The indicating lamp HF1 is an I power failure indicating lamp; the indicator lamp HF2 is a II power failure indicator lamp; the indicator lamp HF3 is a cooler fault indicator lamp; the fourth indicator lamp HF4 is a cooler operation indicator lamp; the indicator lamp XD1 is an I power supply running indicator lamp; the indicator light XD2 is an II power supply running indicator light.
The positive pole of the direct current power supply is respectively connected with the 1 pin of the normally open contact of the third relay K3, the fourth relay K4 and the fifth relay K5, the 1 pin of the normally closed contact of the first three-phase switching switch 1C and the second three-phase switching switch 2C, and the 3 pin of the change-over switch KK is connected with the 7 pin;
The negative pole of the direct current power supply is respectively connected with 8 pins of coils of the first relay K1, the third relay K3, the fourth relay K4 and the fifth relay K5; the 8 pins of the coils of the first three-phase switching switch 1C and the second three-phase switching switch 2C are connected with the negative electrode of the capacitor C.
A thermal relay KH is connected between the C-phase of the first three-phase switching switch 1C and the a-phase of the second three-phase switching switch 2C.
A6 end of a J6 terminal is arranged between the positive electrode end and the negative electrode end of the direct current power supply, and the 6 end of the J6 terminal is used for inputting fault signals of other controllers; the fault signal may be a PLC or other controller fault signal.
Meanwhile, as shown in fig. 4, a J7 terminal is also arranged on the PCB and is used for providing signal output for the PLC or other controllers; a 1-end stop position; 2, automatically positioning the end; 3 end I section fault signal; a 4-terminal II-section power failure signal; 5 end cooler operation signal; the 6 end is a public end. Specifically, the 1 end of the J7 terminal is connected with the 10 pin of the change-over switch KK for stopping signal output, the 2 end of the J7 terminal is connected with the 12 pin of the change-over switch KK for automatic signal output, the 3 end of the J7 terminal is connected with the first power supply monitoring unit QX1 for outputting fault signals detected by the power supply monitoring unit QX1, and the 4 end of the J7 terminal is connected with the second power supply monitoring unit QX2 for outputting fault signals detected by the power supply monitoring unit QX 2; the 5 end of the J7 terminal is connected with the first relay K1 and is used for outputting a cooler starting signal feedback; the 6 end of the J7 terminal is used for outputting a common signal, and the J7 terminal is used for outputting all signals in the whole system.
In operation, as shown in fig. 3, the manual and automatic control modes are realized through the KK change-over switch. The change-over switch has four selection states of manual I, manual II, stop and automatic II;
Manual (code number M1): when the control change-over switch is switched on at the position, as can be known from the schematic diagram, the 3 pin and the 4 pin of the change-over switch KK are conducted, the normally closed contact of the three-phase switching switch 2C is used for enabling the coil of the third relay K3 to be electrified and attracted, all contacts of the third relay K3 start to act, the coil of the first three-phase switching switch 1C is conducted through the normally closed contact 1 and the 2 pin of the second three-phase switching switch 2C, the conduction of the 3 contact and the 4 contact of the third relay K3 is electrified and attracted, the indicator lamp XD1 (I power supply operation indicator lamp) is lightened, the device is directly electrified into the I section power supply at the moment, and the power bus is provided with the three-phase power supply at the moment. Because the 1 foot and the 2 feet of the J5 terminal are connected with the normally closed contacts of the thermal relay KH, when the thermal relay KH is in a normal state, the second relay K2 is electrified and closed, at the moment, the 1 foot and the 2 foot of the third relay K3 are conducted, the 1 foot and the 2 foot of the second relay K2 are also conducted, and the ST end of the cooler soft start unit RQD is triggered to start soft start output and automatically bypass. Meanwhile, the RUN end output of the cooler soft start unit RQD enables the coil of the first relay K1 to be electrified and attracted, the fourth indicator lamp HF4 is lighted, the capacitor C is fully charged to wait for the disconnection of the loop of the first relay K1, and the delay is released. The capacitor can replace a power-off time delay relay, so that the circuit is simplified, and meanwhile, the volume is reduced.
II manual (code M2): the same applies to "I Manual". The 3, 4 feet of change over switch KK are changed into change over switch KK7, 8 feet at the during operation, and first three-phase on-off switch 1C exchanges with second three-phase on-off switch 2C, and third relay K3 is replaced with fourth relay K4.
When the first three-phase switching switch 1C is switched to the second three-phase switching switch 1C, at the moment, the first three-phase switching switch 1C is interlocked with the second three-phase switching switch 2C, when the first three-phase switching switch 1C is switched off, the second three-phase switching switch 2C is switched on, then a soft start bypass is switched to the first manual switching switch 1C, and then the soft stop is performed, at the moment, the first relay K1 is powered off, the first relay K1 is kept on by a capacitor C, the first three-phase switching switch 1C is not switched off, the capacitor C is kept off, and then the first three-phase switching switch 1C is switched off, at the moment, the second three-phase switching switch 2C is switched on, and then the soft start bypass is switched to the second manual switching switch 1C, and then the soft stop is switched to the same, and the processes are continued under the condition that no current is generated when the power relay is powered on and switched off, so that the phenomena of arc pulling phenomenon in the processes of the on and off are effectively prevented, and the relay contacts or burning phenomenon is caused.
Stop (code S): when the control change-over switch is switched on at the position, all the contacts of the change-over switch KK are not conducted, and the I/II section power supply is withdrawn, namely the cooler is withdrawn from operation.
Automatic (code a 01): when the control change-over switch is switched on at the position, the 1 pin and the 2 pin of the change-over switch KK are conducted, the 5 pin and the 6 pin are also conducted, at the moment, the 1 end or the 2 end of the J6 terminal is in short circuit with the 4 end of the J6 terminal, namely, the device outputs a dry node signal to an 'I power supply input signal' through a PLC or other control devices, the 1 pin and the 2 pin of the change-over switch KK are conducted with the 3 pin and the 4 pin of the first power supply monitoring unit QX1 through the 3 pin and the 4 pin of the second three-phase switching switch 2C, so that the third relay K3 is electrified and attracted, and the following action process is the same as that after the 'I manual' third relay K3 acts. After the operation is completed, if the 1 end or the 2 end of the J6 terminal is short-circuited with the 5 end of the J6 terminal, that is, if the device outputs a dry node signal to the "II power on signal" through the PLC or other control device, the device does not execute the operation, and keeps the original state, because the signal of the "I power on signal" does not disappear, the first three-phase switching switch 1C and the second three-phase switching switch 2C have a forced interlocking relationship, so the fourth relay K4 cannot get electricity, so the second three-phase switching switch 2C cannot get electricity, and if the signal of the "I power on signal" disappears or the I power fails to make the first power monitoring unit QX1 relay lose magnetism, the device executes the operation of switching on the II power on cooler according to the logic and operation process of the "I manual" switching "II manual" to operate. The I power supply and the II power supply have the same effect, and in general, the PLC or other controllers only output any signal, when one output power supply fails, the other output signal is output, and the original signal is withdrawn before output. If two signals are output, the first inputter takes precedence, or the non-faulted person takes precedence. When the PLC or other controller fails, a signal is fed back to the actuator, now replacing the signal with a short between the 1 or 2 terminal of the J6 terminal and the 6 terminal of the J6 terminal. At this time, the fifth relay K5 is electrified and attracted, and the I power supply switching signal is preferably switched on, because the normally open contact 1 pin and the normally open contact 2 pin of the fifth relay K5 are connected with the I power supply switching signal in parallel. The other normally open contact 3 pin and the other normally open contact 4 pin of the fifth relay K5 are respectively connected with the normally closed contact 5 pin of the first power monitoring unit QX1 and the 6 end of the J6 terminal in series and then are connected with the power-on signal of the II in parallel, so that in the situation, the II is only powered on when the I power fails, otherwise, the I power is always powered on. Therefore, even if the external control device fails, the cooler can still reliably operate under the protection of double power supplies, and the accident of complete stop of the cooler can not be caused.
The executor has signal indication function, namely, when the I power is input, an indicator lamp XD1 (I power running indicator lamp) is lightened, and when the I power running indicator lamp fails, an indicator lamp HF1 (I power failure indicator lamp) is lightened; when the II power supply is switched on, an indicator lamp XD2 (II power supply running indicator lamp) is lightened, and when the fault occurs, an indicator lamp HF2 (II power supply fault indicator lamp) is lightened; when the soft start unit is operating and there is no fault, the indicator lamp HF3 (cooler operation indicator lamp) is lit. When the power supply of the section I or the power supply of the section II is put into operation, the cooler is directly started; after a power-on signal is sent, the cooler does not run back after a time delay (not less than 1 s), and the PLC or other devices can output a signal of 'cooler failure'. I.e. the 1 or 2 terminal of the J6 terminal is shorted to the 3 terminal of the J6 terminal instead of a signal, the actuator will illuminate the indicator lamp HF3 (cooler fault indicator lamp).
The technology provided by the embodiment is modularized with the control execution device of the transformer cooler, realizes that each group of coolers are controlled by using a single module, has clear structure, is reduced in the aspect of replacement and maintenance, is economical and practical, brings great convenience to the cooling control, maintenance and management of the transformer, and makes up the blank that a single group of coolers of the transformer has double power supply control execution devices.
The embodiment provides a double-power-supply control actuator of a single-group cooler of a transformer, which is an actuator in a traditional cooler control system, and no special control or actuator for controlling the single-group cooler of the transformer exists in the market at present. The control of the traditional cooler is that all control elements of the cooler mainly comprise a circuit breaker, a contactor, a thermal relay, a relay and the like, the control elements are placed in a control cabinet with huge volume, the control cabinet is placed in disorder, the power supplies of all the coolers share one path, and when the power supply of the path is switched, the air cooling is stopped completely, so that accidents are caused. And the internal wiring is extremely complicated, electromagnetic interference is extremely easy to generate, and when faults occur, the lines are mutually connected and must be replaced in a power failure, so that a plurality of inconveniences are brought to maintainers. The single-group cooler control actuator of the transformer provided by the invention replaces each group of coolers controlled by the traditional control cabinet by an electric loop composed of electric elements such as a contactor and an idle switch, has the functions of double power supplies, and can automatically complete switching. The function can be realized by adopting traditional electric elements such as contactor phase sequence relay and the like, but the volume is more than 3 times of the invention, and the manufacturing cost is far higher than the invention. The use of dual power control actuators in a chiller control system increases the reliability and stability of the overall system and standardization in maintenance. The cooler double-power-supply executor is selected for each group of coolers, so that each group of coolers is provided with a group of double-power-supply switching loops, the independence of power supplies of the coolers is guaranteed, the problem that all the coolers share one double-power-supply switching loop in the past is solved, or when the devices are replaced in an electrified mode, the devices are tightly connected with other loops, the power supplies are not put into due to mutual involvement, the complete stop of the coolers is caused, and the risk of major accidents caused by tripping of the transformer is caused. The direct start of the motor is changed into soft start, so that the impact of starting current on a power grid can be reduced. The relay is used for replacing the contactor, the defect that the relay has no arc extinguishing function can be overcome through the control logic, the double-power switching and soft start bypass can be executed, the size of the controller can be greatly reduced, and the cost is greatly saved. The actuator can ensure uninterrupted operation of the transformer and avoid error tripping accidents caused by faults of the cooling actuator. Solves the problems that spare parts can not be replaced in an electrified way and the replacement time is long. The executor itself has complete input and output interface and may be connected to PLC, DCS and other electric loops to realize comprehensive control to form the cooler control system.
A control method of a control device of a power transformer cooler, comprising:
When the control change-over switch is switched to the manual control I position (the code number of the manual control I position is M1), the 3 and 4 pins of the change-over switch KK are conducted, the coil of the third relay K3 is electrified and attracted through the normally closed contact of the three-phase switching switch 2C, all the contact pins of the third relay K3 are conducted, the coil of the first three-phase switching switch 1C is conducted through the normally closed contact 1 and 2 pins of the second three-phase switching switch 2C, the normally open contact 3 pin and 4 pin of the third relay K3 are conducted to obtain electrified and attracted, and at the moment, the first empty switch ZK1 connected with the three-phase power supply is started to supply power for the cooler;
When the control change-over switch is switched to a manual control II position (the code number of the manual control II position is M2), the 7 pin and the 8 pin of the change-over switch KK are conducted, then the coil of the fourth relay K4 is electrified and attracted through the normally closed contact of the three-phase switching switch 1C, all the contact pins of the fourth relay K4 are conducted, the coil of the second three-phase switching switch 2C is conducted through the normally closed contact 1 and the 2 pin of the first three-phase switching switch 1C, the normally open contact 3 pin and the 4 pin of the fourth relay K4 are conducted to obtain electrification and attracted, and at the moment, the second empty switch ZK2 connected with the three-phase power supply is started to supply power for the cooler;
When the control change-over switch is switched to an automatic control position (the code of the automatic control position is A01), the 1 foot and the 2 foot of the change-over switch KK are conducted, the 5 foot and the 6 foot of the change-over switch KK are conducted, at the moment, the 1 end or the 2 end of the J6 terminal is short-circuited with the 4 end of the J6 terminal, at the moment, the signal input is carried out to the first empty switch ZK1 or the second empty switch ZK2 through the control signal for outputting a dry node signal, the 1 foot and the 2 foot of the change-over switch KK are conducted with the 3 foot and the 4 foot of the first power supply monitoring unit QX1 through the 3 foot and the 4 foot of the second three-phase switching switch 2C, the third relay K3 is conducted by electrically sucking all contact feet of the third relay K3, the normally-closed contact 1 and the 2 foot of the third relay K3 are conducted through the second three-phase switching switch 2C, at the moment, the first empty switch ZK1 or the second empty switch ZK2 is connected with the three-phase power supply is conducted, and the first empty switch ZK1 or the second empty switch ZK2 is connected with the three-phase power supply.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (6)
1. A control device of a power transformer cooler, which is characterized by comprising an execution circuit and a control circuit;
the execution circuit comprises a first idle switch (ZK 1) and a second idle switch (ZK 2) which are connected by two paths of three-phase power supplies; the first air switch (ZK 1) and the second air switch (ZK 2) are connected with the cooler, a first three-phase switching switch (1C) and a second three-phase switching switch (2C) are respectively arranged between the cooler and the first air switch (ZK 1) and between the first air switch and the second air switch (ZK 2), and a cooler soft start unit (RQD) is arranged between the AB phases of the first three-phase switching switch (1C) and the second three-phase switching switch (2C) and the cooler;
the control circuit comprises a direct current power supply, a first relay (K1), a second relay (K2), a third relay (K3), a fourth relay (K4), a fifth relay (K5) and a change-over switch (KK) which are connected to the PCB;
The normally open contact 2 pins of the third relay (K3) and the fourth relay (K4) are connected with the normally open contact 1 pin of the second relay (K2), the ST end of the cooler soft start unit (RQD) is connected with the normally open contact 2 pin of the second relay (K2), and the RUN end of the cooler soft start unit (RQD) is respectively connected with the coil 7 pin of the first relay (K1), the capacitor (C) and the fourth indicator lamp (HF 4);
The transfer switch (KK) is respectively connected with the auxiliary contact 3 pins of the first three-phase switching switch (1C) and the second three-phase switching switch (2C); the auxiliary contact 4 pins of the first three-phase switching switch (1C) and the second three-phase switching switch (2C) are respectively connected with the 7 pins of the third relay (K3) coil and the fourth relay (K4) coil;
the auxiliary contact 2 pin of the second three-phase switching switch (2C) is respectively connected with the normally open contact 3 pin of the third relay (K3) and the normally open contact 4 pin of the first relay (K1) and the normally open contact 3 pin of the third relay (K3) and the first relay (K1) are connected with the coil 7 pin of the first three-phase switching switch (1C); the auxiliary contact 2 pin of the first three-phase switching switch (1C) is respectively connected with the normally open contact 1 pin of the first relay (K1) and the normally open contact 1 pin of the fourth relay (K4), and the normally open contact 2 pin of the first relay (K1) and the normally open contact 4 pin of the fourth relay (K4) are connected with the coil 7 pin of the second three-phase switching switch (2C);
The positive pole of the direct current power supply is respectively connected with the 1 pin of the normally open contact of the third relay (K3), the fourth relay (K4) and the fifth relay (K5), the 1 pin of the normally closed contact of the first three-phase switching switch (1C) and the second three-phase switching switch (2C), and the 3 pin of the change-over switch (KK) is connected with the 7 pin;
The negative pole of the direct current power supply is respectively connected with 8 pins of coils of the first relay (K1), the third relay (K3), the fourth relay (K4) and the fifth relay (K5); the 8 pins of the coils of the first three-phase switching switch (1C) and the second three-phase switching switch (2C) are connected with the negative electrode of the capacitor (C);
The lower ends of the first air switch (ZK 1) and the second air switch (ZK 2) are respectively connected with a first power supply monitoring unit (QX 1) and a second power supply monitoring unit (QX 2) for detecting power supply;
The 1 pin of the change-over switch (KK) is respectively connected with the 4 end of the J6 terminal and the 2 pin of the normally open contact of the fifth relay (K5), the 1 pin of the normally open contact of the fifth relay (K5) is connected with the positive electrode end of the direct current power supply, and the 4 end of the J6 terminal is used for inputting a three-phase power supply input signal connected with the first open circuit (ZK 1);
The 5 pin of the change-over switch (KK) is respectively connected with the 5 end of the J6 terminal and the normally open contact 4 pin of the fifth relay (K5), the normally open contact 3 pin of the fifth relay (K5) is connected with the 6 pin of the first power supply monitoring unit (QX 1), the 5 pin of the first power supply monitoring unit (QX 1) is connected with the positive electrode end of the direct current power supply, and the 5 end of the J6 terminal is used for inputting a three-phase power supply input signal connected by the second open switch (ZK 2);
the 3 pin and the 7 pin of the change-over switch (KK) are respectively connected with the positive pole end of the direct current power supply;
the 2 pin of the change-over switch (KK) is connected with the 3 pin of the first power supply monitoring unit (QX 1); the pin 4 of the first power supply monitoring unit (QX 1) and the pin 4 of the change-over switch (KK) are respectively connected with the pin 3 of the auxiliary contact of the second three-phase switching switch (2C);
The 6 pin of the change-over switch (KK) is connected with the 3 pin of the second power supply monitoring unit (QX 2); the pin 4 of the second power supply monitoring unit (QX 2) and the pin 8 of the change-over switch (KK) are respectively connected with the pin 3 of the auxiliary contact of the first three-phase switching switch (1C);
Comprising the following steps:
When the control change-over switch is switched to the manual control I position, the 3 and 4 pins of the change-over switch (KK) are conducted, then the normally closed contact of the second three-phase switching switch (2C) enables the coil of the third relay (K3) to be electrified and attracted, all contact pins of the third relay (K3) are conducted, the coil of the first three-phase switching switch (1C) is conducted through the normally closed contact 1 and 2 pins of the second three-phase switching switch (2C), the normally open contact 3 pin and 4 pin of the third relay (K3) are conducted to be electrified and attracted, and at the moment, the first open switch (ZK 1) connected with the three-phase power supply is started to supply power for the cooler;
When the control change-over switch is switched to a manual control II position, pins 7 and 8 of the change-over switch (KK) are conducted, a coil of a fourth relay (K4) is electrified and attracted through a normally closed contact of a first three-phase switching switch (1C), all contact pins of the fourth relay (K4) are conducted, a coil of a second three-phase switching switch (2C) is conducted through normally closed contacts 1 and 2 pins of the first three-phase switching switch (1C), a normally open contact 3 pin and a normally open contact 4 pin of the fourth relay (K4) are conducted to obtain electrification and attracted, and a second air switch (ZK 2) connected with a three-phase power supply is started at the moment to supply power for a cooler;
when automatic control is carried out on the change-over switch (KK), when the change-over switch (KK) is controlled to be switched to an automatic control position, the 1 foot and the 2 foot of the change-over switch (KK) are conducted, the 5 foot and the 6 foot of the change-over switch (KK) are conducted, at the moment, the 1 end or the 2 end of the J6 terminal is in short circuit with the 4 end of the J6 terminal, at the moment, a control signal is used for outputting a dry node signal to be started in a first empty switch (ZK 1) or a second empty switch (ZK 2) is input, the 1 foot and the 2 foot of the change-over switch (KK) are conducted with the 3 foot and the 4 foot of a first power supply monitoring unit (QX 1) through the 3 foot and the 4 foot of a second three-phase switch (2C), all contact feet of a third relay (K3) are conducted, a first three-phase switch (1C) coil is conducted through the normally-closed contact 1 foot and the 2 foot of a second three-phase switch (2C), and the normally-open contact 3 foot and the 4 foot of the third relay (K3) is electrically closed, at the first empty switch (ZK 1) or the second empty switch (ZK 2) is connected, and the first empty switch (ZK) is connected with the first empty switch (ZK 1) or the second empty switch (ZK) is cooled.
2. The control device of a power transformer cooler according to claim 1, characterized in that the direct current power supply is formed by connecting a three-phase power supply connected by an AC phase of a first air switch (ZK 1) and a second air switch (ZK 2) in parallel through a first disconnecting switch power supply (P1) and a second disconnecting switch power supply (P2), and the first disconnecting switch power supply (P1) and the second disconnecting switch power supply (P2) are connected in parallel.
3. The control device of a power transformer cooler according to claim 1, characterized in that a thermal relay (KH) is connected between the C-phase of the first three-phase switching switch (1C) and the a-phase of the second three-phase switching switch (2C).
4. The control device of a power transformer cooler according to claim 1, characterized in that the positive terminals of the first and second isolating switch power supplies (P1, P2) in the direct current power supply are connected with a first diode (D1) and a second diode (D2), and the first diode (D1) and the second diode (D2) are connected in series with a safety (F3).
5. A control device for a power transformer cooler according to claim 1, characterized in that the terminal 6 of the J6 terminal is arranged between the positive and negative terminals of the direct current power supply, the terminal 6 of the J6 terminal being used for the input of fault signals of other controllers.
6. A control device of a power transformer cooler according to claim 1, characterized in that the positive terminal of the direct current power supply is connected with the 1 and 2 terminals of the J6 terminal, the negative terminal of the direct current power supply is connected with the 3 terminal of the J6 terminal, the 1 and 2 terminals of the J6 terminal are used for the input of a common signal, and the 3 terminal of the J6 terminal is used for the input of a cooler fault signal.
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| CN101442250A (en) * | 2007-11-23 | 2009-05-27 | 张永亮 | Combined frequency changer for mining |
| CN207503068U (en) * | 2017-10-12 | 2018-06-15 | 国电南瑞科技股份有限公司 | A kind of energy-saving main transformer cooler switch board |
| WO2019144205A1 (en) * | 2018-01-26 | 2019-08-01 | Eletra Industrial Ltda | Electric vehicle power management system |
| CN111047851A (en) * | 2020-03-13 | 2020-04-21 | 山东奇美仪器有限公司 | Control system of multifunctional mechanical testing machine |
| CN219795525U (en) * | 2023-04-19 | 2023-10-03 | 宁夏润丰新材料科技有限公司 | Variable frequency control system of circulating gas compressor of reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101442250A (en) * | 2007-11-23 | 2009-05-27 | 张永亮 | Combined frequency changer for mining |
| CN207503068U (en) * | 2017-10-12 | 2018-06-15 | 国电南瑞科技股份有限公司 | A kind of energy-saving main transformer cooler switch board |
| WO2019144205A1 (en) * | 2018-01-26 | 2019-08-01 | Eletra Industrial Ltda | Electric vehicle power management system |
| CN111047851A (en) * | 2020-03-13 | 2020-04-21 | 山东奇美仪器有限公司 | Control system of multifunctional mechanical testing machine |
| CN219795525U (en) * | 2023-04-19 | 2023-10-03 | 宁夏润丰新材料科技有限公司 | Variable frequency control system of circulating gas compressor of reactor |
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