SU848735A1 - Method and apparatus for emergency breakdown of hydraulic unit working in synchronous compensator duty - Google Patents

Description

(54) THE METHOD OF EMERGENCY STOPPING THE HYDRO-AIR OIL,

WORKING IN SYNCHRONOUS COMPENSATOR MODE, AND DEVICE FOR ITS IMPLEMENTATION

The invention relates to hydropower and can be used in the automation of hydraulic units operating in the mode of synchronous compensator. Methods are known for emergency shutdown of a hydraulic unit operating in a synchronous compensator mode by applying an emergency stop relay action to the controller in the direction of opening the guide unit for the duration of air removal from the impeller chamber, then closing the guide unit and activating mechanical brakes one . These methods do not provide the necessary reliability. The closest to the proposed method is an emergency stop of a hygroelectric unit operating in a synchronous compensator mode by matching the reference frequency of the regulator with the maximum permissible frequency in the power system and applying the effect of the emergency stop relay to the regulator in the direction of opening the guide vane removing the air from the chamber of the impeller, then closing the guide vane and activating the mechanical brakes 2. A device for emergency stop of the hydraulic unit is also known, operating in the synchronous compensator mode, containing an emergency stop relay with normally closed contacts, connected via a time relay to a controller connected to the guiding apparatus, the blocks are shifted. hydraulic unit water to synchronous compensator mode and reference frequency associated with the regulator, and the control unit installed in the feedback circuit at the position of the guiding apparatus with its normally closed contacts 2. The disadvantage of this method is reduced performance in a wide frequency deviation range in the power grid. The purpose of the invention is to increase speed in a wide range of frequency deviations in the power system. To achieve the goal, the frequencies are coordinated using an emergency stop relay by abruptly increasing the reference frequency to a value greater than the maximum allowed frequency in the power supply. To ensure reliability, the guided opening level of the guide is predetermined and the reference frequency is reduced to the original value when the direction is reached the specified level.

In the device for emergency shutdown of the hydraulic unit, the normally closed contacts of the emergency stop relay are connected to the communication line of the translation unit with the controller, and the normally closed contacts of the commander to the communication unit of the reference frequency unit with the regulator.

The drawing shows a schematic diagram of the device.

Key 1 is connected to an emergency stop relay 2, which is also connected to unit 3 of electrical and hydromechanical protection. The output of relay 2 through time relay 4 is connected to an electro-hydraulic controller 5, which includes a b restriction opening mechanism and an electro-hydraulic converter 7 connected to the main spool 8, as well as a frequency switch 9 and a frequency changing mechanism 10 connected via you A driver 11 with an input of an electroguide of the four-way converter 7. Regulator 5 is connected by its output to a guide device 12. In the feedback circuit 13 by position of the guide device 12, a command device 14 is set, normally closed The contacts 15 of which are entered into the communication line 6 of the block 17 of the reference frequency with the regulator 5. The unit 18 converting the hydraulic unit to the synchronous compensator mode is connected to the block 17 of the reference frequency and the line 19 is connected to the regulator 5. In the line 19 the normally closed contacts 20 are entered emergency stop relay 2.

Emergency stop of hydraulic unit operating in synchronous compensator mode occurs when key 1 or protection unit 3 is acting on relay 2. Relay 2 activates opening of contacts 20, communication of the transfer part block 8 with regulator 5 is interrupted, and the transmitter 7 responds to the signal from display 11. The reference frequency block 17 increases the signal from the frequency circuit 9 to the output 11, above the maximum allowable frequency in the power system (specified when the device is trimmed), i.e. this signal is obviously higher than the signal from frequency 10 mechanism. Therefore, the total signal at the output of the detectors .11 is directed to the opening of the guiding apparatus 12.

After the relay 4 time K is activated, which is tuned to the time required to remove air from the impeller chamber, the opening restriction mechanism 6 sends a signal to the main spool 8 in the closing direction and the guide device 12.

To limit the opening of the guiding device 12 (and consequently; however, the rotational frequency of the hydraulic unit rotor when air is released from the impeller chamber from the commander 14 when the specified opening level is reached, the reference frequency is passed through the contacts 15. Then the controller 5 maintains the rotational speed determined by the signals of the mechanism 10 for changing the frequency and frequency circuit 9. When the relay 4 is turned off, the controller 5 covers the guide apparatus to the idle level determined by the ratio of the signals of the mechanism 10 and the circuit 9. After the time 4 relay triggers, the guide apparatus 12 closes completely with a signal from the stop restriction mechanism b.

Emergency stop by the proposed method has high speed and reliability.

Claims (3)

1. Method of emergency shutdown of a hydraulic unit operating in a synchronous compensator mode by matching the reference frequency of the regulator with the maximum permissible frequency in the power system and the effect of the emergency stop switch on the regulator in the direction of opening the guide vane during removal of air from the impeller chamber, subsequent closing the guide vane and activating mechanical brakes, characterized in that, in order to increase speed in a wide range of frequency deviations in energy subject frequency matching lead via an emergency stop switch by increasing the reference frequency hopping to a value prevyschayuschey maksimalnsz allowable frequency energoisteme. 2. Method POP1, characterized in that, in order to increase reliability, the predetermined opening level of the guide apparatus is predetermined and the reference frequency is abruptly reduced to the initial value when the guide apparatus reaches the specified level. 3. A device for carrying out the method according to Claim 1, comprising an emergency stop relay with normally closed contacts, connected via a time relay to a controller connected to the guide apparatus, blocks for switching the hydraulic unit to synchronous compensator mode and frequency frequency associated with the controller , and the control device installed in the feedback circuit on the position of the guiding apparatus, with its normally closed contacts, about t and, so that the normally closed contacts re (Z The emergency stop is entered into the communication line of the translation unit with the regulator, and the normally closed contacts of the controller, into the communication line of the reference frequency unit with the regulator. 5 Sources of information 0101 taken into account during the examination 1. Authors certificate of the USSR 470656, cl. Rose on 15/00, 1970. 2. USSR author's certificate on application 2515114/06, 0 cl. F 03 to 15/13, 1977.