JPS62243902A - Mobile oil pressure tester - Google Patents

Abstract

PURPOSE:To facilitate the grasp and adjustment of a single property of a controller by mounting a torque motor tester of DACA controller, a DC power source for a governor motor, a pseudo oil pressure signal generator, a waste oil recovering pump, etc. on a mobile truck. CONSTITUTION:On a mobile truck 14 are mounted a torque motor tester 3 for supplying DC power simulating an actual machine to a torque motor for controlling a DACA controller 4 and a constant voltage power source 6 for supplying direct current to a DC motor and DC power simulating the actual machine to the DC motor for controlling a load limiter 7, a main governor 8 and a main closing valve controlling mechanism 9. On the truck 14 are mounted further an electric hydraulic converter 10 for generating pseudo oil pressure signals controlling the main governor 8, a waste oil recovering pump 13 activated when the oil level in an oil tank 12 reaches a specified value, a controller 17 and the like. Thus, the single adjustment of the governor can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a main purpose of creating a simulated governor-impeller oil pressure of a rotation signal on-site without operating a steam turbine during oil pressure adjustment before starting a steam turbine; This is a testing device for steam turbine hydraulic control devices that tests the functionality of the device in the state of actual equipment combinations, and is used in the technical field to enable appropriate adjustment before starting the steam turbine.

BACKGROUND OF THE INVENTION Hydraulic control devices for steam turbines generally include a) a main governor, b) an auxiliary governor, C) a hydraulic booster, +1) various drive motors, and e) a DACA control device (D 1g1tal A).
nalogConLrolA pparaLus
(high range speed control device). An outline of these effects will be described below.

a) In normal times, the main governor adjusts the opening degree of the main steam regulating valve to control the load and speed of the steam turbine.

b) The auxiliary governor controls the speed and load of the steam turbine by reducing the opening of the main steam regulating valve in the event of an abnormality, such as a load cutoff or a large sudden change.

C) Hydraulic booster: The opening degree of the main steam regulating valve is adjusted via a pressure servo mechanism, and the proportional constant with this hydraulic main steam regulating valve opening degree is adjusted.

d) Various drive motors d-1 Main governor An electric signal is sent to the DC drive motor attached to the main governor to adjust the signal oil pressure that controls the opening degree of the main steam regulating valve.

d-2 Low limiter Sends an electric signal to the DC drive motor attached to the low limiter that limits the upper limit of the main steam regulating valve opening, that is, the maximum load of the steam turbine, and limits the upper limit of the main steam regulating valve opening. Adjust the signal oil pressure.

d-3 Main blocking valve control mechanism An electric signal is sent to the DC drive motor attached to the main blocking valve control mechanism to adjust the signal oil pressure that controls the opening degree of the main blocking valve.

e) The DACA controller main governor operates at low steam turbine speeds, i.e. approximately ±6
Since it is possible to control only a speed range of about 10%, this device I'7 controls the high range, 0 to 1o.

% speed range control.

Problem to be Solved by the Invention Conventionally, in order to confirm the function of the conventional hydraulic control device described in Problem 1--, it was necessary to operate the steam turbine. The current situation is that hydraulic adjustment requires an extremely large amount of time, man-hours, and various expenses.

Means for Solving the Problems The present invention takes the following measures in order to solve the above-mentioned problems. In other words, a torque motor tester device that transmits DC power was used to simulate an actual machine to the torque motor that controls the DACA control device, and a simulation was made to the actual machine to the DC motor that controls the low limiter, main governor, and main stop valve control mechanism. A DC constant voltage power supply device for the motor that transmits DC power, an electro-hydraulic converter device that sends a simulated hydraulic signal to control the main governor via a torque motor, and a high-pressure oil converter that sends high-pressure oil to a torque motor to control the main governor. The drain oil collection pump, which automatically starts when reaching 4, and the control panel for each device and each device are placed on a single moving trolley, and the device and each device are equipped with electricity, instrumentation, and hydraulic oil. Provide a connection terminal.

Operation The present invention applies the following technology to solve the conventional problems.

b) Do not operate the steam turbine when checking the characteristics of the steam turbine control device on-site at the 6 power plants and making adjustments.

In a hydraulic control device, the oil pressure generated by the governor impeller attached to the end of the steam turbine shaft (hereinafter referred to as governor impeller oil pressure) is proportional to the square of the rotation speed, which is a natural law. A simulation is conducted to check the individual characteristics of each device, especially the speed governor, in a state where the entire control device is combined, which is completely different from when operating a steam turbine.

c) For this purpose, a blocking IL plate is provided in the governor impeller oil pipe system of the steam turbine, and a separately placed hydraulic pressure plate is installed.
+, /+ (--if, g--) 'i IJQ
41+ /Pi U-Sen Z I'-EL? - Pressure transmission to the control device.

2) The hydraulic test equipment shall be equipped with equipment, equipment, control panels, instruments, and electrical, instrumentation, and hydraulic fluid connection terminals necessary for controlling the steam turbine installed in the power plant's central control room.

(e) The hydraulic testing device is made as light and compact as possible, and it is placed on a moving trolley equipped with casters to facilitate transportation.

Embodiment Next, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 (a side view taken along the line 1--n in FIG. 1).

Note that the same components are given the same reference numerals.

In FIG. 1, a high-pressure bearing stand 1 of the steam turbine is provided with a device for detecting the governor impeller oil pressure, and this oil pressure serves as a control signal during operation of the steam turbine, but in the present invention, the steam turbine is not operated. Therefore, a blocking plate 2 is provided in the tube system of the core part to prevent leakage of the simulated signal part from the test equipment.

Hereinafter, the procedure for testing the control device described in the prior art section using each device, each device, and each control panel according to the present invention will be explained.

The torque motor tester device 3 transmits power to the torque motor that controls the DACA control device 4 using a DC type horn that simulates the actual machine, converts the power input of AC 100cm to DC θ~IA, O~25V, and outputs 11FIi. It is possible to transmit direct current electrical signals of the same type and can be adapted to all modes of all considered steam turbines. In addition,
The operation can be performed either automatically or manually, and the output voltage and output current are displayed digitally. Note that the operation is performed by the control panel 5.

The motor DC constant voltage power supply device 6 has a low limiter 7.
, which mainly transmits DC power simulating the actual machine to the DC motor that controls the vana 8 and the main stop valve control mechanism 9. It converts the AC toov power input into DC 0 to 125V, and makes fine adjustments during this time. Possibly adapted to all steam turbines considered. Operation is by manual switch operation for forward rotation, stop, and reverse rotation, and output voltage and output current are digitally displayed. Note that the operation is performed using the control panel 5.

The electro-hydraulic converter 10 sends a high 7111 pressure simulated hydraulic signal to control the main governor 8 through the torque motor, so the hydraulic control range is 0-4 kg/cm''G.

It can be adapted to all modes of all steam turbines considered. Note that the operation of the torque motor is arranged in parallel to the motor DC constant voltage power supply panel of the control panel 5. The auxiliary governor 11 is linked to the oil pressure signal of the main governor 8 and has a control function that responds to sudden changes in the oil pressure signal that the main governor 8 cannot follow. Although the hydraulic booster is not shown, a simulation test of the actual machine is performed by engaging the DC motor of the main governor 8 with the electrohydraulic converter 10 and the motor DC power supply 6.

By using the method described above, it is possible to confirm the individual performance of each control device in its combined state by simulating the operating state without operating the steam turbine. In particular, it will now be possible to easily perform auxiliary governor acceleration characteristics verification tests, which have required extremely high skill and extreme caution to avoid damaging the steam turbine when operating the steam turbine.

Next, in order to collect the drained oil from the governor, the oil tank 12 is attached to this device, and when the oil level in the tank reaches the specified value, the drained oil recovery pump I3 is automatically started and the drained oil is steamed. Transfer to the high pressure bearing stand l of the turbine. Control device 17 of the mechanism
is operated by the control panel 5.

All of the devices and equipment described above are mounted on a moving cart 14, protected by guard vibes 15, and facilitated by casters 16 for transportation. The dimensions of this device are width 1176mm, depth 635mm+
, the height is only 1210mm.

In addition, all records of each speed governor, especially those involving transient phenomena, are recorded on an oscilloscope recorder to facilitate adjustment, and a flexible hose is used in the simulated oil pressure signal circuit to prepare for the test. If it's a flight, it's fine.

Effects of the Invention According to the hydraulic testing device of the present invention, the following effects can be achieved.

a) The individual characteristics of the control device, especially the speed governor, can be easily understood based on the actual machine, making it possible to make appropriate adjustments to the steam turbine starting surface, improving quality control and reliability more than ever before. be able to.

b) In the later stage of on-site hydraulic adjustment work, man-hours and costs are reduced.

[Brief explanation of drawings]

FIG. 1 is a front view of a movable cart according to the present invention, showing the system of each device and equipment, and FIG. 2 is a side view taken along the line ■-■ in FIG. l... Bearing stand, 2... Blocking plate, 3... Torque motor tester device, 4... DACA control device, 5... Control panel, 6
... DC constant voltage power supply for motor, 7.. Low limiter, 8.. Main governor, 9.. Main stop valve control mechanism, IO.
・Electro-hydraulic conversion device, 11... Auxiliary governor, 12...
Oil tank, 13... Exhaust Af + recovery pump, 14... Mobile trolley, 15... Guard pipe, 16... Caster, 17
...Control (1 other person) Figure 2 1t: Yuyu〉2

Claims (1)

[Claims] A torque motor tester device that transmits DC power that simulates the actual machine to the torque motor that controls the DACA control device, and a DC power that simulates the actual machine to the DC motor that controls the low limiter, main governor, and main check valve control mechanism. A DC constant voltage power supply for the motor, an electro-hydraulic converter that sends a simulated hydraulic signal to control the main governor using high-pressure oil via a torque motor, and an electro-hydraulic converter that automatically starts when the oil level in the oil tank reaches a specified value. A mobile hydraulic test in which a waste oil recovery pump and a control panel for each device and each device are mounted on a single mobile trolley, and each device and device is equipped with electrical, instrumentation, and hydraulic oil connection terminals. Device.