JP2548701B2 - Mobile hydraulic test equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has the main purpose of locally, without operating a steam turbine at the time of adjusting the hydraulic pressure before starting the steam turbine.
A test device for a steam turbine hydraulic control device that simulates the governor impeller oil pressure of the rotation signal and performs a function confirmation test of the device in the actual machine combination state, and enables proper adjustment when starting the steam turbine. Used in the technical field.

2. Description of the Related Art Generally, a hydraulic control device for a steam turbine includes a) a main governor, b) an auxiliary governor, c) a hydraulic booster, d) various drive motors, and e) a DACA control device (Digital Analog Control A).
pparatus high speed control device). The outline of these actions will be described below.

a) The main governor normally adjusts the opening degree of the main steam control 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 adjusting the opening degree of the main steam control valve in the event of an abnormality, for example, when the load is cut off or a sudden change occurs.

c) Hydraulic booster: The opening of the main steam adjusting valve is adjusted via a hydraulic servo mechanism, and the proportional constant with the hydraulic main steam adjusting opening is changed and adjusted.

d) Various drive motors d-1 Main governor Sends an electric signal to the DC drive motor mounted on the main governor to adjust the signal hydraulic pressure that controls the opening of the main steam regulating valve.

d-2 Load limiter The upper limit value of the main steam control valve opening, that is, an electric signal is sent to the DC drive motor mounted on the load limiter that limits the maximum load of the steam turbine to limit the upper limit value of the main steam control valve opening. Adjust the signal oil pressure.

d-3 Main block valve control mechanism An electric signal is sent to a DC drive motor mounted on the main block valve control mechanism to adjust the signal hydraulic pressure for controlling the opening degree of the main block valve.

e) DACA controller The main governor is the low range of steam turbine speed, that is, about ±
Since only 6% speed range control is possible, this device controls the high range, that is, 0 to 100% speed range.

Problems to be Solved by the Invention In order to confirm the function of the above-described hydraulic control device of the conventional example, conventionally, the steam turbine had to be operated. For this reason, it takes a lot of time to adjust the hydraulic pressure at the site.
The current situation is that it requires man-hours and various expenses.

Means for Solving Problems The present invention adopts the following means in order to solve the above-mentioned problems. That is, the torque motor tester device that transmits DC power that simulates the actual device to the torque motor that controls the DACA control device, and the DC power that simulates the actual device to the DC motor that controls the load limiter, main governor, and main shutoff valve control mechanism. DC constant voltage power supply device for motors that transmits power, an electric hydraulic converter that sends a simulated hydraulic pressure signal that controls the main governor of high pressure oil via a torque motor, and automatically when the oil level in the oil tank reaches a specified value. The oil recovery pump that starts up and the control panel for each device and each device are mounted on a single moving carriage, and the device and each device are provided with connection terminals for electricity, instrumentation, and hydraulic oil.

Action The present invention applies the following technique in order to solve the conventional problems.

I). Do not operate the steam turbine when confirming the characteristics of the steam turbine controller at the power plant site and making adjustments.

B). In a hydraulic control device, a hydraulic pressure generated by a governor impeller attached to a shaft end of a steam turbine (hereinafter referred to as a governor impeller hydraulic pressure) uses a natural law proportional to the square of the rotation speed, and the impeller hydraulic pressure is simulated. Check the individual characteristics of each device, especially the speed governor, in the condition that the whole control device is combined, which is completely the same as when the steam turbine is operating.

C). For this reason, a blocking plate is provided in the governor impeller oil pipe system of the steam turbine, and a simulated signal of the governor impeller oil is pressure-transmitted and transmitted to the control device from a separately arranged hydraulic test device.

D). The hydraulic test equipment consists of the equipment, equipment, control panel and instruments necessary for controlling the steam turbine, and they are equipped with electrical, instrumentation and hydraulic oil connection terminals.

E). The hydraulic test apparatus is made as light and compact as possible and placed on a moving carriage with casters to facilitate transportation.

EXAMPLE Next, an example of the present invention will be described in detail with reference to FIGS. 1 and 2 (side view taken along the line II-II in FIG. 1). The same components are designated by the same reference numerals.

In FIG. 1, a frame enclosed by a two-dot chain line A is a product equipment to which the mobile hydraulic test apparatus according to the present invention is applied, and the governor impeller hydraulic pressure is detected on the high pressure bearing stand 1 of the steam turbine. This hydraulic pressure serves as a control signal during the operation of the steam turbine. However, since the steam turbine is not operated in the present invention, the blocking plate 2 is provided in the pipe system of the part to perform the test. Prevent leakage of simulated signal oil from the device.

Hereinafter, the test procedure of the control device described in the above-mentioned conventional technique by each device, each device and each control panel according to the present invention will be described.

The torque motor tester device 3 transmits direct current power simulating an actual device to a torque motor that controls the DACA control device 4, and inputs a power supply of 100 V AC to 0 to 1 A DC,
Converting from 0 to 25V, it is capable of transmitting 11 DC electrical signals and can be adapted to all modes of all considered steam turbines. The operation can be performed either automatically or manually, and the output voltage and output current are digitally displayed. The operation is performed by the control panel 5.

The DC constant voltage power supply device 6 for a motor transmits direct-current power simulating an actual machine by a direct-current motor that controls the load limiter 7, the main governor 8, and the main shut-off valve control mechanism 9. It can be switched to a DC of 0 to 125 V, with fine adjustments possible during this time to suit all steam turbines considered. Operation is forward rotation, stop,
The output voltage and output current are displayed digitally with the manual switch operation for reverse rotation. The operation is performed by the control panel 5.

The electro-hydraulic converter 10 sends a high hydraulic pressure to a simulated hydraulic pressure signal for controlling the main governor 8 via a torque motor, and the hydraulic pressure control range is 0 to 4 kg / cm ² G, all steam turbines considered. Can be adapted to any mode.
The operation of the torque motor is arranged in parallel with the motor DC constant voltage power supply device board of the control board 5. The auxiliary governor 11 interlocks with the hydraulic signal of the main governor 8 and has a control function that responds to a sudden change in the hydraulic signal that the main governor 8 cannot follow. Although the hydraulic booster is not shown, the simulation confirmation test of the actual machine is performed by the engaging operation of the electric hydraulic converter 10 and the DC motor of the main governor 8 by the motor DC power supply 6.

With the above-described method, it is possible to confirm the independent performance in each control device combination state in which the operating state is simulated without operating the steam turbine. Especially when the steam turbine is operated, the auxiliary governor acceleration characteristic confirmation test, which requires extremely advanced skill and meticulous attention so as not to damage the steam turbine, can be easily performed.

Next, in order to collect the waste oil from the governor, the oil tank 12 is attached to this device, and when the tank oil level reaches the specified value, the waste oil recovery pump 13 automatically starts and the waste oil is vaporized. Transfer to the high pressure bearing stand 1 of the turbine. The control device 17 of the mechanism is operated by the control panel 5.

The above-described torque motor tester device 3, control panel 5,
DC constant voltage power supply device 6 for motor, electric hydraulic conversion device 1
The oil tank 12, the oil tank 12, the oil recovery pump 13 and the control device 17 are all mounted on a moving carriage 14, protected by a guard pipe 15 and facilitated by a caster 16. The dimensions of this device are 1176 mm width, 635 mm depth, and 1 height.
It is only 210 mm.

All records of each governor, especially those with transient phenomena, are recorded in the oscillo recorder for easy adjustment, and flexible hydraulic hose is used for the simulated hydraulic signal circuit to prepare for the test. I am stooling.

Effects of the Invention According to the hydraulic test apparatus 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 grasped in accordance with the actual machine, and proper adjustment can be made before starting the steam turbine to improve quality control and reliability more than before. You can

b) The number of man-hours and costs will be reduced in the latter stage of the on-site hydraulic pressure adjustment work.

[Brief description of drawings]

FIG. 1 is a front view of a moving carriage showing a system of each device and each device according to the present invention, and FIG. 2 is a side view taken along the line II-II of FIG. 1 ... Bearing base, 2 ... Blocking plate, 3 ... Torque motor tester device, 4 ... DACA control device, 5 ... Control panel, 6 ...
DC constant voltage power supply for motor, 7 ... Load limiter,
8 ... Main governor, 9 ... Main blocking valve control mechanism, 10 ... Electric hydraulic converter, 11 ... Auxiliary governor, 12 ... Oil tank,
13 …… Oil recovery pump, 14 …… Mobile cart, 15 …… Guard pipe, 16 …… Caster, 17 …… Control device.

Claims (1)

(57) [Claims] 1. A torque motor tester device for transmitting direct-current power, which simulates an actual device to a torque motor for controlling a DACA control device, and a direct current motor for controlling a load limiter, a main governor, and a main stop valve control mechanism. A DC constant voltage power supply device for a motor that transmits the DC power,
An electric hydraulic conversion device that sends a simulated hydraulic pressure signal that controls the main governor of high-pressure oil via a torque motor; an oil recovery pump that automatically starts when the oil level in the oil tank reaches a specified value; A mobile hydraulic testing device in which a control panel for each device is placed on a single mobile trolley, and each device and each device is provided with connection terminals for electricity, instrumentation, and hydraulic oil.