KR20040100599A - Method of Controling Start Sequence of Medium Voltage Motor Starting Part in the Power Plant - Google Patents

Abstract

PURPOSE: A method for processing a starter sequence of a high voltage motor in an electric power house is provided to prevent a failure in the starting operation of the motor by transmitting a connection status after starting. CONSTITUTION: A method for processing a starter sequence of a high voltage motor in an electric power house includes following steps. Mother line connection nodes of a main breaker and an auxiliary breaker of the high voltage motor in the electric power house are connected in series. Whether the mother lines of the main breaker and the auxiliary breaker are connected is determined(S11) when the high voltage motor is motivated. A status of connection of the mother lines of the main breaker and the auxiliary breaker is transmitted to an operation controller(S12) as a starting condition of the operation controller. The start command is transmitted to the high voltage motor via the main breaker and the auxiliary breaker to operate the high voltage motor directly(S14).

Description

How to handle starting sequence of high voltage motor starting panel in power plant {Method of Controlling Start Sequence of Medium Voltage Motor Starting Part in the Power Plant}

The present invention relates to a method for processing a high-voltage motor starting panel startup sequence in a power plant, and more particularly, to a method for processing a high-voltage motor starting panel startup sequence in a power plant in which a power station parking breaker and auxiliary breaker busbar connection status signal are transmitted from a power plant.

In the conventional power plant, the automatic transformer starting panel among the high voltage motor starting panels constitutes a starting sequence with three breakers, and the interface contact is operated by the operation monitor so that the operator can operate in the cab when connected to the main power supply bus of the parking short circuit. In order to prevent abnormality in the power supply system due to voltage drop during the direct start of the large capacity motor, the starting voltage of the own circuit is lowered to start the supply.

As shown in FIG. 1, the automatic transformer starting panel has a parking supply 11 for power supply, an automatic transformer 12, a second circuit breaker 13 for configuring a single winding transformer, and a power supply for starting after completion. It consists of a third circuit breaker (14).

Looking at the startup sequence of the automatic transformer starting panel configured as described above with reference to the flow chart of FIG.

First, to check whether the bus connection of the parking circuit 11 is made (step S1), the second circuit breaker 13 is closed to make a single-circuit transformer for the automatic transformer 12, by closing the parking circuit 11 , The bus bar connection of the parking short 11 is made.

Then, the start command is transmitted to the automatic transformer tap power motor (part indicated by 'M' in FIG. 1) through the parking terminal 11 (step S2), and thus the corresponding motor (M). ) Is powered on and starts up.

At this time, it is checked whether the start of the motor M is successfully performed (step S3). If the start of the motor M is not performed, the first step S1 is repeated.

On the other hand, if the start of the motor M has been successfully performed, the start of the motor M is completed (step S4), in which case the circuit breaker 13 for the single-circuit transformer configuration is opened and the third circuit breaker ( 14) is closed and operates by supplying full voltage to the motor power.

In other words, as shown in FIG. 3, regardless of whether the starter breakers are all connected to the connection position, the interface contact is operated so that the driver can be operated in the cab when the parking breaker is connected to the main power supply bus. It is supplied to the operation monitor.

By the way, in the prior art, the high-voltage motor starting panel does not start the motor because only the parking short circuit is connected to the power supply bus, and all the circuit breakers are connected to the main bus to start, but only the presence of the power supply connection of the parking short circuit is confirmed. As a result, the problem of starting fails when not connected to the power supply bus of the other breaker.

In order to solve the above problems, the present invention is to provide a method for processing a high-voltage motor starter start sequence in a power station to transmit the starter parking breaker and the auxiliary circuit breaker busbar connection status signal from the power plant.

In addition, an object of the present invention is to transmit a starter parking breaker and an auxiliary breaker busbar connection status signal in a power plant, so that there is no failure of starting after a start command.

1 is a block diagram showing an automatic transformer starting panel in a high-voltage motor starting panel in a general power plant.

Fig. 2 is a diagram showing the starting procedure of the automatic transformer starting panel in the high pressure motor starting panel in a general power plant.

3 shows an example of a startup sequence in FIG. 2;

4 is a view showing a startup sequence of the automatic transformer starting panel in the high-voltage motor starting panel in the power plant according to the embodiment of the present invention.

FIG. 5 shows an example of a startup sequence in FIG. 4; FIG.

Explanation of symbols on the main parts of the drawings

11: power supply parking short circuit

12: Auto Transformer

13: 2nd circuit breaker for single winding transformer

14: third breaker for power supply

In the power plant according to an embodiment of the present invention for achieving the object as described above, the method for processing the starting sequence of the high-voltage motor starter in the power plant according to the embodiment of the present invention is a process of connecting the bus connection contact points of the starting parking circuit breaker and the starting auxiliary breaker in series and; Checking whether buses of the starting parking circuit breaker and the starting auxiliary circuit breaker are connected when the high voltage motor starts; Transmitting a bus connection state of the starting parking breaker and the starting auxiliary breaker to a driving control facility under a cab starting condition; It characterized in that it comprises a step of immediately starting by transmitting the start command to the high-pressure motor through the starting parking short circuit and the starting auxiliary breaker.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention for achieving the above object will be described in detail.

Referring to the flowchart of FIG. 4, a high-voltage motor starting board startup sequence processing method in a power plant according to an embodiment of the present invention is as follows.

First, it is checked whether the bus connection of the starting parking breaker and the starting auxiliary breaker is made (step S11). By connecting the bus connection contacts of the starting parking breaker and the starting auxiliary breaker in series, the second circuit breaker is closed. When the transformer is made of a single winding transformer, the starting parking breaker and the starting auxiliary breaker are closed, and thus the bus connection of the starting parking breaker and the starting auxiliary breaker is made.

Accordingly, the bus connection state of the starting parking breaker and the starting auxiliary breaker is transmitted to the driving control facility under the cab starting condition (step S12). Accordingly, a start command is transmitted through the starting parking breaker and the starting auxiliary breaker. The transfer is made to the automatic transformer tap power motor (step S13).

Then, the motor is started by being supplied with power, so that the motor is started immediately after the start command (step S14). At this time, the circuit breaker for the single winding transformer is opened and the third circuit breaker is closed to supply the full voltage to the motor power to operate the circuit breaker.

And, in the power plant according to the embodiment of the present invention, the high-voltage motor starting panel starting sequence processing method as shown in Figure 5, the start command by connecting the bus connection connection of the starter parking circuit breaker and the starting auxiliary circuit breaker in series as a cab starting condition Afterwards there is no failure of starting.

5 is a view for explaining a high-voltage motor starting panel startup sequence processing method according to an embodiment of the present invention, a view showing an example of the starting sequence of the automatic transformer starting panel in the high-voltage motor starting panel.

As described above, in the related art, the parking short circuit bus connection state is transmitted to the driving control facility. However, according to the present invention, the parking short circuit and the starting auxiliary breaker bus connection state are transmitted to the driving control facility.

As described above, according to the present invention, the starter parking breaker and the auxiliary breaker busbar connection status signal are transmitted from the power plant, thereby preventing the starting failure after the start command.

Claims (1)

Connecting the bus bar connection contacts of the starting parking circuit breaker and the starting auxiliary circuit breaker in series in the high-voltage motor starting panel of the power plant; Checking whether buses of the starting parking circuit breaker and the starting auxiliary circuit breaker are connected when the high voltage motor starts; Transmitting a bus connection state of the starting parking breaker and the starting auxiliary breaker to a driving control facility under a cab starting condition; And a step of transmitting the start command to the high pressure motor through the starting parking short circuit and the starting auxiliary breaker to immediately start the high voltage motor starting panel starting sequence in the power plant.