CN204572087U

CN204572087U - A kind of rolling gear of turbine runs control loop

Info

Publication number: CN204572087U
Application number: CN201520207609.6U
Authority: CN
Inventors: 黄喜文
Original assignee: Datang Guizhou Faer Power Generation Co Ltd
Current assignee: Datang Guizhou Faer Power Generation Co Ltd
Priority date: 2015-04-08
Filing date: 2015-04-08
Publication date: 2015-08-19
Anticipated expiration: 2025-04-08

Abstract

The utility model provides a kind of rolling gear of turbine and runs control loop, run control loop by transformer T from outside three phase mains power taking, between the two ends of described transformer T secondary, be in series with the auxiliary contact of fus FU, manual change-over switch SA1 ~ SA2, manual stop button SB2, manual actuation of button SB1, pressure switch SM1 ~ SM2, position limit switch SQ1, contactor KM and thermorelay FR; The utility model further ensures the bringing normally into operation of barring gear, and solving barring gear cannot bringing normally into operation, and steam turbine is affected by thermal expansion and contraction, and turbine blade will the problem of bending; The pressure switch place corresponding at jacking(oil) pump increases in-situ protection loop, solves the problem of the trial throw difficulty of barring gear; Increase instruction loop, facilitate field personnel to check the working state of jiggering, avoid the serious consequence brought because jiggering cannot normally drop into.

Description

A kind of rolling gear of turbine runs control loop

Technical field

The utility model relates to turbine control field, is specifically related to a kind of rolling gear of turbine and runs control loop.

Background technique

Power station large machine barring gear is one of important supplementary equipment in thermal power plant, when unit carries out large light maintenance, when equipment is stopped transport, steam turbine temperatures as high more than 300 is spent, when steam turbine is down to 1200 turns from 3000 turns, start jacking(oil) pump, when being down to 0 turn, in order to each heating surface of turbine blade is even, now must put into operation barring gear.Jiggering, under automatic Starting mode, requires higher to the equipment of control loop and compressed-air actuated source of the gas.In actual moving process, easily there is apical tooth or engagement phenomenon loosely, therefore, never use automated manner to hang jiggering so far.Due to jacking(oil) pump start time, pump discharge pressure change greatly, to the impact of pressure switch, easy build-up of pressure switching damage, jacking oil pressure switch signal does not transmit, can cause jiggering permission starting condition do not meet, cannot normally start.Now, if barring gear cannot bringing normally into operation, steam turbine is affected by thermal expansion and contraction, and turbine blade will bending, thus affects device security reliable operation, specially increases in-situ protection loop.In addition, generally a period of time just needs jiggering of trying to shoot, and looks at that can jiggering normally work, but condition during trial throw does not reach the operating conditions of barring gear, directly cannot carry out the trial throw of barring gear.

Model utility content

For solving the problems of the technologies described above, the utility model provides a kind of rolling gear of turbine and runs control loop, this rolling gear of turbine runs control loop and ensures jiggering bringing normally into operation further, not only solving barring gear cannot bringing normally into operation, steam turbine is affected by thermal expansion and contraction, turbine blade will the problem of bending, and solves the problem of trial throw difficulty of barring gear.

The utility model is achieved by the following technical programs.

A kind of rolling gear of turbine that the utility model provides runs control loop, run control loop and pass through transformer T from outside three phase mains power taking, comprise manual change-over switch SA1 ~ SA2, automatic change-over SA3 ~ SA5, manual actuation of button SB1, manual stop button SB2, pressure switch SM1 ~ SM2, S/CO SP, position limit switch SQ1 ~ SQ2, interlock push-button switch SB3, contactor KM and auxiliary contact thereof; The auxiliary contact of fus FU, manual change-over switch SA1 ~ SA2, manual stop button SB2, manual actuation of button SB1, pressure switch SM1 ~ SM2, position limit switch SQ1, contactor KM and thermorelay FR are in series with between the two ends of described transformer T secondary, the two ends of described manual change-over switch SA1 are parallel with automatic change-over SA3, and the two ends of described manual stop button SB2 are parallel with automatic change-over SA4; In parallel with manual change-over switch SA2 and manual actuation of button SB1 after described automatic change-over SA5, S/CO SP and position limit switch SQ2 series connection, two front ends of described interlock push-button switch SB3 are all connected with the front end of automatic change-over SA5, one of them rear end of described interlock push-button switch SB3 is connected with the rear end of position limit switch SQ2 through the normally opened contact KM-c of contactor KM, and another rear end is connected with the rear end of pressure switch SM2.

The two ends of described pressure switch SM2 are also parallel with circuit breaker Q F.

Also comprise instruction loop, the one end in instruction loop is connected with one end of transformer T secondary through fus FU, and the other end is directly connected with the other end of transformer T secondary.

Described instruction loop comprises to be run instruction branch road and stops instruction branch road, and the normally opened contact KM-a running an instruction route tutorial light L1 and contactor KM is in series; The normally-closed contact KM-b of an instruction route tutorial light L2 and contactor KM is stopped to be in series.

The beneficial effects of the utility model are: run control loop and further ensure the bringing normally into operation of barring gear, and solving barring gear cannot bringing normally into operation, and steam turbine is affected by thermal expansion and contraction, and turbine blade will the problem of bending; The pressure switch place corresponding at jacking(oil) pump increases in-situ protection loop, solves the problem of the trial throw difficulty of barring gear; Increase instruction loop, facilitate field personnel to check the working state of jiggering, avoid the serious consequence brought because jiggering cannot normally drop into.

Accompanying drawing explanation

Fig. 1 is electric control theory figure of the present utility model.

Embodiment

Further describe the technical solution of the utility model below, but described in claimed scope is not limited to.

A kind of rolling gear of turbine as shown in Figure 1 runs control loop, run control loop and pass through transformer T from outside three phase mains power taking, comprise manual change-over switch SA1 ~ SA2, automatic change-over SA3 ~ SA5, manual actuation of button SB1, manual stop button SB2, pressure switch SM1 ~ SM2, S/CO SP, position limit switch SQ1 ~ SQ2, interlock push-button switch SB3, contactor KM and auxiliary contact thereof; The auxiliary contact of fus FU, manual change-over switch SA1 ~ SA2, manual stop button SB2, manual actuation of button SB1, pressure switch SM1 ~ SM2, position limit switch SQ1, contactor KM and thermorelay FR are in series with between the two ends of described transformer T secondary, the two ends of described manual change-over switch SA1 are parallel with automatic change-over SA3, and the two ends of described manual stop button SB2 are parallel with automatic change-over SA4; In parallel with manual change-over switch SA2 and manual actuation of button SB1 after described automatic change-over SA5, S/CO SP and position limit switch SQ2 series connection, two front ends of described interlock push-button switch SB3 are all connected with the front end of automatic change-over SA5, one of them rear end of described interlock push-button switch SB3 is connected with the rear end of position limit switch SQ2 through the normally opened contact KM-c of contactor KM, and another rear end is connected with the rear end of pressure switch SM2.Ensure the bringing normally into operation of barring gear, solving barring gear cannot bringing normally into operation, and steam turbine is affected by thermal expansion and contraction, and turbine blade will the problem of bending.

The two ends of described pressure switch SM2 are also parallel with circuit breaker Q F.By circuit breaker Q F being closed the trial throw carrying out barring gear, namely the oil pressure of jacking(oil) pump do not reach make the pressure switch SM2 of its correspondence closed in just can directly try to shoot to barring gear, simple, convenient.

Also comprise instruction loop, the one end in instruction loop is connected with one end of transformer T secondary through fus FU, and the other end is directly connected with the other end of transformer T secondary.Described instruction loop comprises to be run instruction branch road and stops instruction branch road, and the normally opened contact KM-a running an instruction route tutorial light L1 and contactor KM is in series; The normally-closed contact KM-b of an instruction route tutorial light L2 and contactor KM is stopped to be in series.Increase instruction loop, facilitate field personnel to check the working state of jiggering, avoid the serious consequence brought because jiggering cannot normally drop into.

The utility model is in practical work process, and when unit normally runs, jacking(oil) pump is in shut down condition, and the pressure switch SM2 corresponding with it disconnects, and whole service control loop does not work.When unit outage, when the rotating speed of steam turbine is down to 1200 turns from 3000 turns, start jacking(oil) pump, the pressure switch SM2 corresponding with it is closed after oil pressure reaches predetermined condition, the pressure switch SM1 that lubricating pump is corresponding is also closed after oil pressure reaches predetermined condition, after loading onto fan guard, position limit switch SQ1 closes, S/CO SP is controlled by the speed measurement device be arranged on barring gear, the rotating speed of barring gear is that zero hourly velocity control switch SP closes, after dropping into barring gear, S/CO SP disconnects, after jiggering and steam turbine gears meshing, position limit switch SQ2 closes.Now can be closed by telecontrol automatic change-over SA3 ~ SA5 and start barring gear, also can close manual change-over switch on the spot and press manual actuation of button SB1 to start barring gear.

When trying to shoot barring gear on the spot, manual change-over switch SA1 ~ SA2 is closed, automatic change-over SA3 ~ SA5 disconnects, switched to by interlock push-button switch SB3 on the position run continuously, close circuit breaker Q F, presses manual actuation of button SB1 again, just can carry out the trial throw of barring gear, facilitate field personnel to make regular check on barring gear whether normally to run, making drop in time when needs drop into barring gear, guaranteeing the problems such as the distortion that steam turbine can not produce because being heated.

Claims

1. a rolling gear of turbine runs control loop, run control loop by transformer T from outside three phase mains power taking, comprise manual change-over switch SA1 ~ SA2, automatic change-over SA3 ~ SA5, manual actuation of button SB1, manual stop button SB2, pressure switch SM1 ~ SM2, S/CO SP, position limit switch SQ1 ~ SQ2, interlock push-button switch SB3, contactor KM and auxiliary contact thereof, it is characterized in that: between the two ends of described transformer T secondary, be in series with fus FU, manual change-over switch SA1 ~ SA2, manual stop button SB2, manual actuation of button SB1, pressure switch SM1 ~ SM2, position limit switch SQ1, the auxiliary contact of contactor KM and thermorelay FR, the two ends of described manual change-over switch SA1 are parallel with automatic change-over SA3, the two ends of described manual stop button SB2 are parallel with automatic change-over SA4, in parallel with manual change-over switch SA2 and manual actuation of button SB1 after described automatic change-over SA5, S/CO SP and position limit switch SQ2 series connection, two front ends of described interlock push-button switch SB3 are all connected with the front end of automatic change-over SA5, one of them rear end of described interlock push-button switch SB3 is connected with the rear end of position limit switch SQ2 through the normally opened contact KM-c of contactor KM, and another rear end is connected with the rear end of pressure switch SM2.

2. rolling gear of turbine as claimed in claim 1 runs control loop, it is characterized in that: the two ends of described pressure switch SM2 are also parallel with circuit breaker Q F.

3. rolling gear of turbine as claimed in claim 1 runs control loop, it is characterized in that: also comprise instruction loop, and the one end in instruction loop is connected with one end of transformer T secondary through fus FU, and the other end is directly connected with the other end of transformer T secondary.

4. rolling gear of turbine as claimed in claim 3 runs control loop, it is characterized in that: described instruction loop comprises to be run instruction branch road and stop instruction branch road, and the normally opened contact KM-a running an instruction route tutorial light L1 and contactor KM is in series; The normally-closed contact KM-b of an instruction route tutorial light L2 and contactor KM is stopped to be in series.