JP2015139300A - Exciter board of electric generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exciter board of electric generator capable of improving reliability on operation by preventing temperature rise within an exciter board.SOLUTION: The exciter board of electric generator includes: plural cooling fans; and a temperature relay that detects an internal temperature rise. When a cooling fan selected by an operator has no abnormality, the selected cooling fan is operated. When the cooling fan selected by the operator has any abnormality and when a cooling fan other than that selected by the operator has no abnormality, the cooling fan other than that selected by the operator is operated. When a temperature rise on the temperature relay is detected, all of the plural cooling fans are operated.

Description

  The present invention relates to an exciter panel that supplies a field current to a field winding in a generator such as a synchronous generator and controls the operation of the generator.

  The exciter panel uses a power thyristor rectifier to convert AC power into DC power, and supplies them to the field winding of the synchronous generator as field voltages and currents to generate the synchronous generator. The thyristor element included in the power thyristor rectifier generates heat due to a loss generated during power conversion. When the heat generation amount exceeds the heat resistance capacity, the thyristor element burns out, and there is a problem that the operation of the exciter panel and the synchronous generator is stopped.

  In general, a power plant using a synchronous generator is required to operate continuously for a long time in order to secure a stable power demand. In order to solve the above problems, a cooling fan is provided on the exciter panel to take measures to cool the thyristor element. Further, in order to improve the reliability of operation, two cooling fans are provided, and even if one (ordinary system) fan breaks, the operation is continued by rotating the other (standby system) fan. In addition, the temperature detection relay detects that the temperature inside the exciter panel has risen, issues an alarm, and the operator who sees it lowers the temperature by, for example, lowering the output of the generator. Had been given.

  As another prior art, a rotational speed command calculation unit configured to give a rotational speed command to the fan motor drive circuit and receive an abnormal signal from the fan motor drive circuit is provided, and an abnormal signal is output from one of the fan motor drive circuits. A multi-unit fan drive device that, when received, increases the value of the rotational speed command for the remaining operable fan motor so that the total air volume obtained by the fan motor before the occurrence of the abnormality does not change there were. (See Patent Document 1)

JP2012-60701

  In conventional synchronous generator exciter panels, when the temperature inside the panel becomes high, an operator operates a cooling fan or lowers the output of the generator. Furthermore, it is necessary for a maintenance person to manually take countermeasures such as removing the clogging of the filter on the apparatus panel, and there is a problem that the work is complicated. In addition, since it takes time to take measures, there is a problem that the temperature is continuously high and the device is damaged.

  Moreover, in the said patent document 1, since it was not what drives a new cooling fan, there existed a problem that an air volume could not be increased.

  The present invention has been made in order to solve the above-mentioned problems, and by taking measures such as newly driving a standby fan, the temperature rise in the exciter panel is suppressed and the operation reliability is improved. The purpose is to improve.

  The generator exciter panel according to the present invention includes a plurality of cooling fans and a temperature relay that detects that the internal temperature has increased, and the cooling fan selected by the operator is abnormal. If there is no failure, the operation command for the selected cooling fan is issued.If there is an abnormality in the cooling fan selected by the operator and there is no abnormality in the cooling fan not selected by the operator, the operator A control logic is provided that issues an operation command to the cooling fans that are not selected, and outputs all operation commands for the plurality of cooling fans when the temperature relay detects that the temperature has risen. is there.

  In the generator exciter panel configured as described above, when a high temperature is detected, a plurality of cooling fans can be operated simultaneously, so that the cooling effect can be enhanced and the temperature rise can be positively suppressed. Therefore, the reliability of operation of the exciter panel can be enhanced.

FIG. 3 is a conceptual diagram showing an exciter panel of a generator according to Embodiment 1. It is a circuit diagram which shows the control logic in an excitation apparatus board. It is a conceptual diagram which shows the excitation apparatus panel of the generator by Embodiment 2. FIG. 10 is a flowchart showing an operation in the second embodiment. FIG. 10 is a conceptual diagram showing an exciter panel of a generator according to a third embodiment. 10 is a flowchart showing an operation in the third embodiment. It is a conceptual diagram which shows the excitation device panel of the generator by Embodiment 4. 10 is a flowchart illustrating an operation in the fourth embodiment.

Embodiment 1 FIG.
The first embodiment will be described below with reference to the drawings. 1 (A) and 1 (B) are conceptual diagrams showing a generator exciter panel according to Embodiment 1, FIG. 1 (A) is a diagram showing normal operation, and FIG. 1 (B) is a high temperature. It is a figure which shows the time of a driving | operation when becoming. FIG. 2 is a circuit diagram showing the control logic in the exciter panel. In FIGS. 1A and 1B, the exciter panel has a high temperature in the panel cooling fan (A system fan) 1, a standby system cooling fan (system B fan) 2, and the temperature in the panel. It has the temperature relay 4 which detects this.

  Further, in FIG. 2, the control logic circuit has a signal 11 for inputting whether or not the A system fan 1 is normal, a signal 12 for inputting whether or not an A system fan selection command has been issued, and whether or not the B system fan has been selected. A signal 13 indicating whether or not, a signal 14 indicating that the temperature in the panel has been raised by the temperature relay 4, a signal 15 indicating whether or not the B-system fan 2 is normal, and a B-system fan selection command It is composed of a signal 16 indicating whether or not a fan has been output, a signal 17 indicating whether or not an A-system fan has been selected, NOT circuits 18A and 18B, AND circuits 19A, 19B, 19C and 19D, and OR circuits 20A and 20B.

  Next, the operation will be described with reference to FIG. In FIG. 2, if no failure is detected in the A-system fan 1 and the B-system fan 2, the A-system fan normal “1” and the B-system fan normal “1” as the signal 15 are input. When the operator selects the A system fan 1 with the changeover switch on the front surface of the exciter panel 3, the A system fan selection command “1” is input as the signal 12 and the A system fan 1 is operated. When the B system fan 2 is selected, a B system fan selection command “1” is input as the signal 16 and the B system fan 2 is operated. Further, when the temperature relay 4 detects that the temperature inside the panel has risen, “1” is input as a signal 14. If the cooling fan continues to operate, the internal bearings will wear out and reach the end of their life, so the cooling fan can be used for as long as possible by manually switching the operation of the A system fan 1 and B system fan 2 periodically via the changeover switch. The exciter panel 3 can be operated continuously for a long time.

  When there is no abnormality in the cooling fan selected by the operator by the changeover switch by the combination of the signal conditions as described above, an operation command for the selected cooling fan is issued. For example, when the A system fan 1 is selected and there is no abnormality in the A system fan 1, “1” is input as the signal 11, “1” is input as the signals 12 and 17, and “0” is input to the signals 13 and 16. "Is input. In this case, the output of the AND circuit 19A becomes “0” regardless of the signal 15, but the output of the OR circuit 20A becomes “1”, so the output of the AND circuit 19C becomes “1” and the A-system fan 1 operates. Will be. On the other hand, since the output of the OR circuit 20B is “0”, the output of the AND circuit 19D is “0”, and the B-system fan 2 is not operated.

  If there is an abnormality in the cooling fan selected by the operator using the changeover switch and there is no abnormality in the cooling fan not selected by the operator, an operation command is issued to the cooling fan not selected by the operator. For example, when the A system fan 1 is selected and the A system fan is abnormal, “0” is input as the signal 11 and “1” is input as the signals 12 and 17. Further, “0” is input as the signals 13 and 16. In this case, since the signal 11 is “0”, the output of the AND circuit 19C is always “0”, and the A-system fan 1 is not operated. On the other hand, since the signal “0” is input to the NOT circuit 18B, the output of the NOT circuit 18B is “1”, and the signal 17 is also “1”, so the output of the AND circuit 19B is “1”. Therefore, since the output of the OR circuit 20B is “1” and the signal 15 is also “1”, the output of the AND circuit 19D is also “1”, and the B-system fan 2 is operated. The same applies to the case where the B-system fan 2 is selected.

  Furthermore, in this embodiment, when the temperature relay 4 detects that the temperature inside the panel has risen, “1” is input as the signal 14 and the outputs of the OR circuits 20A and 20B are always “1”. As long as 11 and 15 are “1”, the outputs of the AND circuits 19C and 19D are “1”, so both the A-system fan 1 and the B-system fan 2 are forcibly operated. The operation based on the signals as described above is automatically performed by a control device (not shown) as a whole. In the above description, the case where two cooling fans A-system fan 1 and B-system fan 2 are installed has been described. However, three or more cooling fans may be provided and controlled.

  In contrast to the conventional case where only one fan is operated even when the temperature relay 4 detects a high temperature, in the present embodiment, after detecting the high temperature, two fans are simultaneously connected. Since it can be operated, the cooling effect is enhanced and the temperature rise can be positively suppressed. Therefore, the reliability of operation of the exciter panel 3 can be enhanced.

Embodiment 2. FIG.
FIG. 3 is a conceptual diagram showing a generator exciter panel according to the second embodiment, and FIG. 4 is a flowchart showing the operation. In this embodiment, an automatic voltage regulator panel 27 having a function of controlling the excitation device panel 3 is provided, and an alarm indicating that the temperature has increased from the excitation device panel 3 to the automatic voltage regulator panel 27. A signal 25 is sent, and a command signal 26 for lowering the field current is sent from the automatic voltage regulator board 27 to the exciter board 3. A field current 28 is output from a thyristor rectifier 30 having a function of converting alternating current into direct current, and the field current 28 flows into the field winding 29.

  Next, the operation will be described with reference to FIG. In FIG. 4, when the temperature in the exciter panel 3 becomes high (STEP 201), two fans are operated (STEP 202) as in the first embodiment (STEP 202), and at the same time, the high temperature alarm 25 is activated using the relay contact. It is sent from the board 3 to the automatic voltage regulator board 27 (STEP 203). In response to the alarm 25, the automatic voltage regulator board 27 sends a command 26 for lowering the field current 28 to the exciter board 3 (STEP 204), and the field current 28 is lowered (STEP 205). As a result, the temperature rise in the exciter panel 3 is suppressed (STEP 206). In the second embodiment, the temperature rise of the exciter panel 3 can be further suppressed as compared with the first embodiment, and the operation reliability can be improved.

Embodiment 3 FIG.
FIG. 5 is a conceptual diagram showing a generator exciter panel according to Embodiment 3, and FIG. 6 is a flowchart showing the operation. In FIG. 5, when the temperature in a board is high, the cooler 31 for sending cold air in the excitation apparatus board 3 is provided.

  Next, the operation will be described with reference to FIG. In FIG. 6, when the temperature in the exciter panel 3 becomes high (STEP 301), two fans are operated as in the first embodiment (STEP 302). At the same time, a high temperature alarm is sent from the exciter panel 3 to the cooler 31 (STEP 303). In response to the alarm, the cooler 31 is operated (STEP 304), and cool air is sent into the exciter panel 3. Thereby, the temperature rise in the excitation device panel 3 is suppressed (STEP 305). In the third embodiment, the temperature rise in the exciter panel 3 can be further suppressed as compared with the first embodiment, and the operation reliability can be improved. When the temperature increases, the operation of the third embodiment and the operation of the second embodiment may be performed simultaneously.

Embodiment 4 FIG.
FIG. 7 is a conceptual diagram showing a generator exciter panel according to Embodiment 4, and FIG. 8 is a flowchart showing the operation. In this embodiment, a governor panel 41 for controlling the load output of the turbine / generator is provided.

  Next, the operation will be described with reference to FIG. When the temperature in the exciter panel 3 becomes high (STEP 401), the two cooling fans are operated as in the first embodiment (STEP 402). At the same time, the high temperature alarm 25 is sent from the exciter panel 3 to the governor board 41 (STEP 403). In response to the warning, the governor board 41 sends a command to lower the load on the generator to the turbine / generator 43 (STEP 404), and lowers the load on the generator (STEP 405). Thereby, the field current 8 of the exciter panel 3 is reduced (STEP 406). Accordingly, the power consumption is reduced, so that the temperature rise is suppressed (STEP 407).

In the fourth embodiment, the temperature rise in the exciter panel 3 can be further suppressed as compared with the first embodiment, and the operation reliability can be improved. In addition to the operation shown in the fourth embodiment, the operation of the second or third embodiment may be performed simultaneously.
It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1, 2, fan for cooling, 3 exciter panel, 4 temperature relay,
27 automatic voltage regulator panel, 28 field current, 31 cooler, 41 governor board,
43 Generator.

Claims (4)

In the generator exciter panel with multiple cooling fans and a temperature relay that detects when the internal temperature is high,
If there is no abnormality in the cooling fan selected by the operator, issue the operation command for the selected cooling fan,
If there is an abnormality in the cooling fan selected by the operator and there is no abnormality in the cooling fan not selected by the operator, an operation command is issued to the cooling fan not selected by the operator,
A generator exciter panel, further comprising a control logic for issuing all operation commands of the plurality of cooling fans when the temperature relay detects that the temperature has risen. 2. The generator according to claim 1, further comprising an automatic voltage adjusting device for sending a command for lowering the field current to the exciter panel when the temperature relay detects that the temperature is high. Excitation device panel. 3. The generator exciter panel according to claim 1 or 2, further comprising a cooler for sending cold air to the exciter panel when the temperature relay detects that the temperature has risen. . 4. The governor panel according to claim 1, further comprising: a governor panel that sends a command to the generator to reduce the load on the generator when the temperature relay detects that the temperature has risen. 5. An exciter panel for the generator described in 1.

Images