JPH09287409A - Oil trip test device of emergency governor for turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil trip test device which is capable of lessening an installation space and of easily and swiftly inspecting unusual state of an oil pressure at the time of the test and a judgment of the condition of an emergency governor. SOLUTION: A controller for an oil trip test for supplying and shutting off test oil having an oil pressure which is changed for an open and close operation with an open degree instruction from a turbine maintenance test device 10 for operating the emergency governors 2 and 2 is constituted with an solenoid proportional valve 22. The oil trip test is executed while monitoring an oil pressure of the test oil with a high detection pressure switch 17 of the test oil and a low pressure switch 18 of the test oil with the result that reset solenoid valve is opened with an instruction from a turbine maintenance test device 10 emitted from a detection signal 8 which has detected the operation of the emergent governor 2 and 2 to restore the emergency governor 2 and 2 to an operation state by feeding the reset oil thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of an oil trip test device for conducting a verification test of the operation of an emergency governor which detects an overspeed of a turbine such as a steam turbine during operation.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional oil trip test apparatus for a steam turbine. Turbine protection devices against overspeed are of paramount importance. Among the protective devices, the ones using the emergency speed governor are designed so that when the rotational speed of the turbine reaches 110 to 111% of the rated value, the speed of the emergency speed governors 2 and 2 installed in the rotor 1 of the turbine shown in FIG. The ejecting rods 3, 3 jump out of the rotor 1 by the centrifugal force increased by the acceleration, hit the levers 5, 5 of the emergency speed governor indicator 4, and the pilot valves 6, 6 of the emergency speed governor indicator 4 spring. 6a, 6a, moving against this pilot valve 6,
The operation of 6 is electrically detected by the proximity switches 7 and 7, and the emergency shutoff device of the electric turbine safety device 9 is activated by these detection signals 8 and 8 to shut off the control lubrication hydraulic pressure and steam control valve. The turbine is tripped by fully closing the turbine inlet valve such as the main steam stop valve. From the viewpoint of reliability, the above-mentioned emergency speed governor is usually provided with two identical structures as described above.

The oil trip test is a test for confirming whether the above-mentioned emergency governor for detecting and protecting the turbine overspeed operates normally, and this test shows the operation of the above-mentioned emergency governor. This is done by hydraulic pressure without stopping the turbine during turbine operation.

A test method using a conventional oil trip test apparatus will be described below with reference to FIG. (1) First, as described above, in order to prevent the electric turbine safety device 9 of the turbine in operation from operating due to the oil trip test, the switch B is opened by the command A from the turbine safety test device 10 and the emergency speed control instruction is given. A lockout is applied so that the detection signal 8 from the devices 4 and 4 is transmitted (C, C) to the turbine security test device 10 and is not transmitted to the electric turbine security device 9. (2) The pressure preparation solenoid valve 11 is excited, and the pressure oil of the lubricating oil from the main oil pump 12 is supplied to the oil transfer controller 1 for the oil trip test.
3 and the reset solenoid valves 14 and 14 are operated, and it is confirmed that the oil pressure is equal to or higher than a specified value by the operation of the pressure switch 15 for preparation oil pressure confirmation which is connected to the oil pipes connected to these. (3) According to the opening command from the turbine security test device 10,
By operating the oil trip test oil supply controller 13, the test oil having a predetermined hydraulic pressure is guided to the emergency speed governors 2 and 2 through the through hole 1b penetrating in the axial direction of the shaft 1a at the front portion of the rotor of the turbine. When the test hydraulic pressure detected by the operation of the test hydraulic pressure low detection pressure switch 17 rises above a predetermined value, the emergency speed governors 2 and 2 are operated by this hydraulic pressure. In this case, it is confirmed that the test hydraulic pressure high detection pressure switch 18 does not operate and the above-mentioned hydraulic pressure is within the allowable limit value. (4) The operation of the emergency speed governors 2 and 2 is performed by the detection signals 8 and 8 of the proximity switches 7 and 7 which detect the operations of the pilot valves 6 and 6 by the movement of the lever 5 of the emergency speed governor instruction device 4. Check with the turbine security test device 10. (5) After the operation of the emergency speed governors 2 and 2 described above, the oil trip controller 13 for the oil trip test is returned to the state before the test, and the test oil is filled with the clearance between the emergency speed governors 2 and 2, and the oil trip test. After passing through the oil supply controller 13 for discharge, it is confirmed that the test oil pressure disappearance confirmation pressure switch 16 is actuated and the oil pressure disappears.

(6) Next, the reset solenoid valves 14 and 14 are excited to guide the reset oil having a predetermined hydraulic pressure to the emergency speed governor instructing devices 4 and 4, respectively. Check by. (7) De-energize the reset solenoid valves 14, 14 to confirm that the reset hydraulic pressure has disappeared.
The operation of No. 9 confirms that the pressure preparation solenoid valve 11 has been demagnetized to decrease the hydraulic pressure by the operation of the preparation hydraulic pressure disappearance confirmation pressure switch 20. (8) The switch B is operated in response to the command A from the turbine security test device 10 to release the lockout between the emergency speed governor indicator devices 4 and 4 and the electric turbine security device 9, and the emergency speed governor indicator device. Detection signals 8 and 8 from 4 and 4 return to a detectable state during turbine operation.

[0006]

In the conventional oil trip test apparatus described above, the oil trip controller 13 for sending the test oil having a predetermined hydraulic pressure to the emergency speed governors 2 and 2 has a structure as shown in FIG. As shown in, the switching valve 1 for adjusting the hydraulic pressure
3a, a driving device 13b for driving the switching valve 13a, a motor 13c for operating the driving device 13b, and a driving device 13c for shutting off and fully opening the test oil feed due to the movement of the switching valve 13a by the driving device 13b. Switching valve 1
The limiter switch 13e and 13f for detecting the respective positions of the drive shaft 13d connected to 3a has a complicated and expensive structure and is equipped with this oil trip controller 13 for oil trip test. Has a problem in that a large installation space is required and the oil trip test device becomes large in size.

Further, in the oil trip test, it has been conventionally confirmed whether the test hydraulic pressure when the emergency speed governor is operating is within a predetermined allowable hydraulic pressure range. Since it is performed by detecting whether or not the working pressure switch 17 is operated, the test hydraulic pressure value at the time of the test cannot be confirmed by the turbine safety test apparatus 10 described above, and when an abnormal test hydraulic pressure occurs, It is necessary to visually check the pressure gauge 21 for the test oil, which indicates the oil pressure provided in the oil pipe of the on-site test device, and there is also a problem that the response in the event of an abnormality during the oil trip test becomes slow. It was

An object of the present invention is to provide an economical oil trip test device which does not require a large installation space as in the conventional art, and to constantly monitor a test oil pressure in a turbine safety test device during an oil trip test. It is possible to provide an oil trip test device that enables the reliability of the operation test of the emergency speed governor.

[0009]

In order to solve the above-mentioned problems, the present invention provides a pressure oil preparation having one end connected to an oil pipe for feeding pressure oil of lubricating oil from a main oil pump of a turbine. An oil valve provided with a solenoid valve and a pressure detector connected to the other end of the pressure oil preparation solenoid valve for detecting the oil pressure,
The hydraulic pressure of the test oil is changed from the pressure oil preparation solenoid valve to the emergency speed governor for oil trip test of the emergency speed governor by opening it by the opening command signal from the turbine security test device through the oil pipe. And an oil trip solenoid proportional valve for sending oil, and an opening command from the turbine safety test equipment after the oil trip solenoid proportional valve is closed by a closing command signal from the turbine safety test equipment after the operation of the emergency speed governor. An emergency speed control from the pressure oil preparation solenoid valve is performed while the pressure oil preparation solenoid valve for opening the signal to reset the emergency speed governor and the reset solenoid valve for sending reset oil from the pressure oil preparation solenoid valve are respectively connected in parallel. A pressure detector for detecting the oil pressure of the test oil sent to the machine shall be connected to the oil pipe. As described above, by using a device that consists of a solenoid proportional valve as the controller that changes the oil pressure for oil trip test to the emergency governor and sends it, an oil trip that is inexpensive and has a small installation space A test device can be obtained.

Further, during the oil trip test, the pressure detector for detecting the oil pressure of the test oil sent from the pressure oil preparation solenoid valve to the emergency speed governor sends the detected oil pressure value to the turbine safety test device. It is composed of an oscillator, and has a calculator for comparing and calculating the detected hydraulic pressure value and a predetermined hydraulic pressure value at which the emergency speed governor operates, and a display for displaying the detected hydraulic pressure value and the calculation result. As a result, the labor of the oil trip test can be saved and the abnormality of the test hydraulic pressure and the quality of the emergency speed governor can be determined more quickly.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a configuration diagram of an oil trip test device for a steam turbine according to a first embodiment of the present invention. As shown in FIG. 1, the embodiment of the present invention includes a pressure oil preparation solenoid valve 1 of the conventional oil trip test apparatus shown in FIG.
The oil trip test which is connected to 1 and replaces the oil trip controller 13 for the oil trip test that sends and shuts off the test oil to the emergency speed governors 2 and 2 and performs the opening / closing operation according to a command from the turbine security test device 10. The electromagnetic proportional valve 22 for use is provided.

[0012] This oil trip test solenoid proportional valve 22
Is an electromagnetic proportional valve opening command that variably outputs the voltage applied to the electromagnetic coil 22a of the oil trip test electromagnetic proportional valve 22 from the turbine safety test apparatus 10 described above. The opening / closing is adjusted to change the value of the test hydraulic pressure to be fed to the emergency speed governors 2 and 2, as shown in FIG. The test by the oil trip test apparatus according to the first embodiment is performed in the same manner as the conventional one, but after confirming that the hydraulic pressure is equal to or higher than the specified value by the operation of the pressure switch 15 for confirming the preparatory hydraulic pressure, Figure 1
In a range in which the test oil pressure low detection pressure switch 17 shown in FIG. 2 operates and the test oil pressure high detection pressure switch 18 does not operate, the emergency speed governors 2 and 2 shown in FIG. As described above, the voltage is gradually increased and gradually applied from the turbine safety test device 10 to the electromagnetic coil 22a of the oil trip test electromagnetic proportional valve 22 so as to be within the test hydraulic pressure setting range. Then, after the emergency speed governors 2 and 2 are operated at a predetermined set hydraulic pressure, the emergency speed governor instructing devices 4 and 4 are returned to the operating position before the test by the reset oil as described above, and the emergency speed governor is returned. Keep 2, 2 operative.

Compared with the conventional oil trip test oil feed controller 13, the above-mentioned oil trip test solenoid proportional valve 22 is a system in which the electromagnetic valve is driven by the electromagnetic coil 22a. Switching valve 13 for adjusting the indicated hydraulic pressure
Since the drive device 13b for driving a, the motor 13c, and the limit switches 13e and 13f for detecting the position of the drive shaft 13d interlocking with the switching valve 13a are not required, the structure is simple and the shape is small. Can be converted.

Embodiment 2 FIG. 3 is a block diagram of an oil trip test device for a steam turbine according to a second embodiment of the present invention. In the embodiment of the present invention, a pressure oscillator 23 is provided in the oil pipe to be fed to the emergency speed governors 2 and 2 of the first embodiment, and the pressure transmitter 23 is a turbine safety test. The oil pressure of the test oil sent from the oil trip solenoid proportional valve 22 opened by the opening command from the device 10 is detected, and the detected oil pressure value is transmitted to the turbine safety test device 10. .

By providing the above-mentioned pressure oscillator 23, it is possible to eliminate the need for installing the test hydraulic pressure high detection pressure switch 18 and the test hydraulic pressure low detection pressure switch 17 for monitoring the hydraulic pressure of the test oil of the conventional oil trip test apparatus. The turbine safety test device 20 can always check the hydraulic pressure value of the test oil by the detection signal from the pressure transmitter 23, and
By detecting the test hydraulic pressure when the emergency speed governors 2 and 2 operate, by detecting the value at the time when the detection signals 8 and 8 from the emergency speed governor instructing devices 4 and 4 from the turbine safety test device 10 are received. Can be read.

Further, in this embodiment, as shown in FIG. 3, the arithmetic unit 2 which compares the hydraulic pressure value from the pressure transmitter 23 with a predetermined set value at which the emergency speed governors 2 and 2 operate.
4, a display 25 such as a printer, an LED and a cathode ray tube for displaying the change with time of the oil pressure during the oil trip test from the pressure transmitter 23 and the result from the controller 24.
Is connected to the turbine security testing device 20. As a result, the oil pressure of the test oil sent to the emergency speed governors 2 and 2 can be constantly monitored, so that the malfunction of the emergency speed governors 2 and 2 during the oil trip test is caused by the malfunction of the components such as the electromagnetic coil 22a. It is possible to confirm whether it is due to abnormality in the test hydraulic pressure due to malfunction of the oil trip solenoid proportional valve 22 or the like.

[0017]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in the oil trip test device for the emergency speed governor, the oil pressure for the oil trip test is changed by changing the hydraulic pressure of the test oil sent to the emergency speed governor. By configuring the controller for oiling with a solenoid valve that is smaller and cheaper than before, it is possible to economically obtain an oil trip test device with a small installation space. Furthermore, the oil pressure value of the test oil sent to the emergency speed governor is detected by the pressure oscillator, and by adding a configuration with a calculator and an indicator that compares the detected oil pressure value, the oil pressure value of the test oil is added. It is possible to confirm the abnormality of the above or verify the operation abnormality of the emergency speed governor quickly and easily and improve the reliability of the trip test.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an oil trip test device for a steam turbine according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram of an opening command of a solenoid proportional valve for an oil trip test and a test hydraulic pressure.

FIG. 3 is a configuration diagram of an oil trip test device for a steam turbine according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional oil trip test device for a steam turbine.

[Explanation of symbols]

 2 Emergency speed governor 4 Emergency speed governor instruction device 9 Electric turbine safety device 10 Turbine safety test device 11 Pressure preparation solenoid valve 14 Reset solenoid valve 22 Oil trip solenoid proportional valve 23 Pressure oscillator 24 Computing unit 25 Indicator

Claims (2)

[Claims] 1. An operation test of an emergency speed governor provided in a rotor of a turbine that sends an operation command signal to an emergency shutoff device of an electric turbine security device that detects an overspeed of the turbine and causes an emergency trip of the turbine. In the oil trip test device that performs the above, a pressure oil preparation solenoid valve is provided by being connected to one end of the oil pipe that feeds the pressurized lubricating oil from the main oil pump of the turbine. The pressure oil preparation solenoid for performing an oil trip test of the emergency governor by opening the oil pipe equipped with a pressure detector connected to the other end to detect the oil pressure by the opening command signal from the turbine security test device. An oil trip solenoid proportional valve that sends a variable oil pressure of the test oil of the lubricating oil from the valve to the emergency governor via an oil pipe, and a closure from the turbine safety test device after the operation of the emergency governor Command With the oil from the pressure oil preparation solenoid valve, the reset oil for resetting the emergency governor is opened by the opening command signal from the turbine safety test device after the oil trip solenoid proportional valve is closed. A reset solenoid valve for sending oil is connected in parallel, and a pressure detector for detecting the hydraulic pressure of the test oil sent from the pressure oil preparation solenoid valve to the emergency speed governor is connected to an oil pipe. An oil trip test device for an emergency speed governor of a turbine. 2. The oil trip test device for an emergency speed governor according to claim 1, comprising a pressure oscillator for transmitting the hydraulic pressure value detected by the pressure detector to the turbine security test device,
A turbine characterized by having a calculator for comparing and calculating a detected hydraulic pressure value and a predetermined hydraulic pressure value at which the emergency speed governor operates, and a display for displaying the detected hydraulic pressure value and the calculation result. Oil trip test device for emergency governor.