JPH09114561A - Output interface substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change an output interface without necessitating the replacement of a substrate by providing a circuit switching an auxiliary relay output contact point converting a digital arithmetic processing output signal to the output contact point of on/off. SOLUTION: In order to change the short-circuit piece 5 of an output contact point switching terminal 4 from the state of setting to the side of a contact point (a) to the output of a contact point (b), the short-circuit piece 5 of the output switching terminal 4 is switched to the side of the contact point (b). Then, whichever the output contact point may be the contact point (a) or the contact point (b), the terminal position of an external connection connector 3 is always fixed. Consequently, the change of the output interface can be dealt with without necessitating the wiring change of the external connection connector 3 or replacement with the substrate of different output contact point constitution. In addition, as the auxiliary relay output contact point can optionally be combined by making it coincide with an external interface, several kinds of output interface substrates of the different constitution of contact points can be unified to be a single kind.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output interface board, and more particularly to an output interface board suitable for use in a digital protection / control device.

[0002]

2. Description of the Related Art In power system protection and control devices for eliminating accidents that occur in power systems and preventing their spread, it is increasingly required to improve the reliability of power supply with the development of advanced information society. Against this background, in order to achieve high reliability, high performance, and downsizing of devices, digital protection / control devices have been applied instead of conventional analog devices.
Since the digital protection / control device uses a microcomputer for arithmetic processing such as protection relay calculation, sequence control and automatic monitoring function, the device can be downsized,
The volume ratio is reduced to about 1/2 as compared with an analog device in which a logic circuit is composed of an IC.

On the other hand, in the output interface circuit of this digital protection / control device, since it is necessary to interface a large amount of information such as operation signals of various protection relays, display / alarm signals, etc., high density mounting of auxiliary relays is required. Miniaturization and miniaturization are being actively promoted by each manufacturer.

Here, the latest output interface circuit is widely used as a means for increasing the number of auxiliary relays to be mounted, in which several auxiliary relays are mounted on a printed circuit board.

[0005]

Generally, an output interface board applied to a digital protection / control device should be applicable to all kinds of protection / control devices such as transmission line protection, transformer protection and bus bar protection. Ideal.

To this end, it is necessary to thoroughly study the number of auxiliary relays mounted on the printed circuit board, the output contact structure, etc., and to standardize and share the hardware.

[0007] However, in the conventional output interface board, the number of output contacts of the auxiliary relay is required to be the minimum because of the structural limitation that the number of connection points with the outside is limited by the type of connector that can be mounted on the printed board or the connection space There is no choice but to limit the output contact structure to 2a contact type or 1a1b
Several types of printed circuit boards that have been fixedly output, such as a contact type, have been appropriately combined and applied.

Therefore, whenever the output interface is changed, the wiring of the external connection connector is changed or
It was necessary to replace the board with a different output contact structure.

Further, since several kinds of printed circuit boards are used in combination in constructing the output interface circuit, a large number of spare relays are provided for each printed circuit board unit, which causes a problem of deterioration of space factor and cost increase. .

An object of the present invention is to change the output interface without the need to change the wiring of the external connection connector section or replace it with a board having a different output contact structure.
To provide an output interface board.

[0011]

The object of the present invention is solved by providing a circuit for switching the output contact between the auxiliary relay contact output section and the external connection connector.

When the output interface is changed, the setting of the output contact switching terminal provided between the auxiliary relay contact output section and the external connector is set by the shorting piece.
The position of the external connection connector terminal is always constant because it can be handled by simply switching to the a-contact side or the b-contact side. Therefore, the output interface can be changed without changing the wiring or replacing the substrate with a different output contact structure.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 3, an external connector 3 is provided on a printed circuit board 1 forming an output interface circuit.
And an auxiliary relay 2 for converting a digital arithmetic processing output signal into an ON / OFF contact output, and a contact output switching terminal 4 arranged near the auxiliary relay 2 for switching the output contact are efficiently arranged. Each pattern is connected.

In FIG. 3, the auxiliary relay 2 is connected to the printed circuit board 1.
9 shows a state in which nine of them are mounted, and FIG. 1 shows a representative sequence for one of the nine circuits of the auxiliary relay 2. Referring to FIG. 1, the external connector 3
The auxiliary relay 2 is excited by the digital arithmetic processing output signal input thereto, and its output contact is output to the external connection connector 3 via the output contact switching terminal 4.

FIG. 1 shows a short-circuit piece 5 of the output contact switching terminal 4.
Shows the state set to the a contact side. To change from this state to the b-contact output, the short-circuit piece 5 of the output switching terminal 4 is switched to the b-contact side.

In this embodiment, the terminal position of the external connector 3 is always constant regardless of whether the output contact is the a contact or the b contact. Therefore, the change of the output interface can be dealt with without the need to change the wiring of the external connection connector section or replace it with a board having a different output contact structure.

Since the auxiliary relay output contacts can be combined with the external interface and arbitrarily combined, several types of output interface boards having different contact configurations can be unified into one model.

[0019]

According to the present invention, the output interface can be changed without changing the wiring of the external connection connector portion or replacing it with a board having a different output contact structure.

Further, since the auxiliary relay output contact can be combined with the external interface and arbitrarily combined,
Several types of output interface boards with different contact configurations can be unified into one model, and there is a sufficient cost reduction effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation of an output interface board showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a representative sequence of an output interface board showing a conventional example.

FIG. 3 is a front view of an output interface board according to the present invention.

[Explanation of symbols]

1 ... Printed circuit board, 2 ... Auxiliary relay, 3 ... External connector, 4 ... Output contact switching terminal, 5 ... Short-circuit piece.

Claims (1)

[Claims] 1. An auxiliary relay for converting a digital arithmetic processing output signal into an ON / OFF contact output, and an output interface board equipped with a connector or a plug for connecting the output contact to the outside, wherein the auxiliary relay output contact is provided. An output interface board provided with a circuit for switching between.