JPS607018A - Breaking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of a breaker device that opens and closes a circuit by combining a mechanical contactor and a power semiconductor element device.

In conventional circuit breakers that open and close circuits through the mechanical operation of contacts, the current is interrupted by extinguishing the arc itself that occurs between the contacts. It requires a large amount of energy and has various drawbacks as described below. In other words, each time the current is cut off, the contact is damaged by the arc and the contact must be inspected, and the operation mechanism requires a large amount of power to cut off the fault current. For example, several cycles may be required.

This invention was made in order to eliminate the drawbacks of the conventional devices, and it connects a power semiconductor element device between a pair of contacts connected to a line, and eliminates the current generated when the surface contactor is opened. detecting an arc voltage to turn on the power semiconductor element device to once commutate the current of the surface contactor to the power semiconductor element device, and then turn off the power semiconductor device to divert the current. The object of the present invention is to provide a breaker that can eliminate the need for large amounts of energy for extinguishing an arc by shutting off the breaker.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A breaker device according to an embodiment of the invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the entirety of this breaker. In the figure, fil is a breaker consisting of a first contact and a second contact connected to the line (2) and arranged so as to be able to connect and separate from each other, and (3) is a thyristor device connected to the breaker (11). It is composed of thyristor elements (3a) connected in antiparallel to each other and in a predetermined number of series stages according to the circuit voltage.(4) shows the voltage division and switching characteristics of each thyristor element (3a). In order to align the thyristor elements, (3a) is connected in parallel with the thyristor element (3a), (6) is a voltage divider that divides the voltage of each thyristor element (3a), and (6) is connected to the output side of the voltage divider. The voltage detection circuit 0 (7) detects the arc voltage caused by the current opening of the circuit breaker fi+. The voltage detection circuit 0 (7) inputs the arc voltage based on the voltage detection circuit (6) via the transmission line (8) and detects it at a predetermined point. The arc signal is sent to the thyristor device (3) via the transmission path (9).
) is a control circuit that outputs to

Next, the operation of the breaker device as an embodiment of the present invention configured as described above will be explained with reference to the drawings. Figure 2 shows each operation waveform diagram when the circuit is cut off, (a) is the fault current flowing in the circuit, (b) is the current flowing in the breaker +11, (
1) A trip signal given to the breaker (1), to)
The opening/closing operation of both contacts of the breaker fi+, ((e) is the current flowing through the thyristor device (3), (e) is the control circuit (
7) shows the ignition signal outputted to the thyristor device (3), and (g) shows the voltage generated between the surface contacts of the breaker (1).

First, when the fault current shown in (a) flows through the circuit, a trip signal shown in (c) is applied to the breaker +11 in order to cause the relay (not shown) to trip the breaker +11. As a result, both contacts of the breaker fil begin operation to open the circuit, and at the point in time shown in (2), they reach the open circuit position, and an arc begins to be generated between the surface contacts. The voltage at this time is shown in (G). This voltage is detected by the voltage detection circuit (6), and the control circuit (7) sends an ignition signal to the thyristor device (3) at the time shown in (F). give. As a result, the thyristor device (3) is turned on and the surface contactors are short-circuited, so the current that was flowing in the cutoff 1sfl) as shown in (b) is now (e).
The current is commutated to the thyristor device (3) as shown in FIG. (This means that the breaker +11 G means that the current has been cut off.) Since the 4th ignition word is a narrow cross as shown in (f), it is transferred to the Cyrisk device (3). The flowing current is turned off by natural commutation at the next current zero point, and eventually the fault current is passed through the SIRISK device (3) for a period of about half a cycle as shown in (E). After this turn-off, between the surface contacts and therefore the cyrisk device (3), (
The recovery voltage shown in (g) is applied. With the above steps, the current interruption is completed.

In addition, the heat generation (loss) caused by the voltage drop in the cyrisk element (c) is considerably larger than that in the breaker i1), so
The current supply is performed by the breaker (1), and therefore the current application is also performed by the breaker itl, making it unnecessary to adjust the timing of application with the thyristor device (3).

In this way, in this invention, the current flow and fault are caused by the turn-off G of the cyrisk device (3), so that it is possible to eliminate the need for large amounts of energy to extinguish the arc, and as a result, the following Various advantages can be obtained. That is, the breaker (1) has a simple arc extinguishing chamber that does not require the supply of arc extinguishing energy compared to conventional circuit breaker, and has a simple operation mechanism with less operating energy for opening and closing operations. The arcing time of both contacts is shorter, so there is less damage and maintenance is almost impossible, and the breaking time can be shortened compared to conventional circuit breakers. be. Also, thyristor device (3)
Since no current flows at all times, there is no loss and no cooling is required. Historically, the number of parallel thyristor elements (3a) is sufficient as long as it can handle the energization energy of a fault current of about one and a half cycles.

In the above embodiment, a thyristor device (3) consisting of thyristor elements (3a) connected in antiparallel is applied, and when an AC fault current is cut off by turn-off based on its natural commutation, the case will be explained in Section 1. However, for example, G
If a TO thyristor element or a +W transistor is used, direct current failures and faults can be handled in the same way.

As explained above, the present invention connects a power semiconductor element device between a pair of contacts connected to a line, detects the arc voltage generated when the current of both the contacts is opened, and By turning on the element device to once commutate the current of both the contacts to the power semiconductor element device, and then turning off the power semiconductor device to interrupt the current, it is possible to eliminate the current required by conventional circuit breaker. This has the effect of making it possible to eliminate the large amount of energy required to extinguish the arc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the entire structure of a breaker according to an embodiment of the present invention, and FIG. 2 is a diagram of each operation waveform of this breaker when the circuit is cut off. In the figure, (1) is a breaker as a first contact and a second contact, (2) is a line, (
3) is a Zyristor device as a power semiconductor element device,
(6) is a voltage detection circuit, and (7) is a control circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] il+ A first contact and a second contact that are connected to the line and arranged so as to be able to come into contact with and separate from each other, and are connected between the two liquid contactors and detect arc voltage accompanying current opening of the surface contactor. A voltage detection circuit that outputs a signal, a control circuit that outputs a predetermined ignition signal in response to the input of the detection signal, and a control circuit that is connected between the two liquid contactors and can be turned on by inputting the ignition signal. A power semiconductor element device that can be turned off by dissipation is provided, and when the surface contactor current is opened, the current flowing between the two liquid contactors is commutated to the power semiconductor device device when the surface contactor is turned on, and the commutation is carried out when the surface contactor is turned off. A cutoff device characterized by cutting off the current flowing through the power semiconductor element device based on the above.