JPH09284979A - Forced operation input method of digital relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of an element selecting means which is provided on a fault detection side and consists of a plurality of switches and standardize a fault detecting relay board. SOLUTION: An element selection unit 12' which selects a plurality (m) of main detecting elements and a plurality (n) of fault detecting elements in a software manner and a main detection forced operation switch SWM are provided on a main detection side. An AND 14 which outputs a signal when a signal is inputted from the switch SWM under a condition that a main detecting element selection signal is inputted from the element selection unit 12' and a transmission unit 13 which transmits a fault detecting element selection signal from the element selection unit 12' to a fault detecting relay 2 side are provided in a main detecting relay 1. A fault detection forced operation switch SWF is provided on the fault detecting relay 2 side. A transmission signal reception unit 23 and an AND 24 which outputs a signal when a signal is inputted from the switch SWF under a condition that a fault detecting element selection signal is inputted from the reception unit 23 are provided in the fault detecting relay 2. The outputs of the AND 14 and the AND 24 are outputted through logic circuits 15 and 16 and logic circuits 25 and 26 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced operation input system for a digital relay.

[0002]

2. Description of the Related Art Conventionally, digital relays (protective relays)
As shown in FIGS. 2 and 3, there are a main detection relay 1 and an accident detection relay. Each relay 1, 2 is independent. When the relays 1 and 2 output, the relays RY1 and RY2 are energized, and when the contacts ry1 and ry2 are both turned on,
The trip coil 3 of the circuit breaker is energized to protect the system.

Reference numeral 11 is a plurality of relay elements y to _m (11 _{1 to} 11 _m ) for performing main detection relay calculation, and 12 is a plurality of relay elements 1 such as a ground fault current detection element and an overcurrent detection element required for relay calculation. ~m relay element selection unit provided in the main detection side (12 ₁ to 12 _m) to select a software manner, SW _M is the main detection relay forced operation for the operation switch (eg, a push button switch), 14 (14 ₁ ~ 14 _m ) is the element selection circuit 12
From the switch SW _M on condition that the element selection information is present, a logical product circuit for outputting a forced operation signal, 15 (15 ₁ to 15 _m ) is a relay element 12 ₁ to selected by the element selection circuit 12. Relay element 11 corresponding to 12 _m
The output from _{1 to} 11 _m and the logical sum circuit for passing the above-mentioned forced operation signal, 16 is a signal from the logical sum circuit 15 (15 ₁ to 15 _m ) on condition that the breaker is closed, and relay RY1 It is a sequence logic circuit for energizing.

Reference numeral 21 denotes a plurality of relay elements 1 to 1 _n (21 _{1 to} 21 _n ) for calculating an accident detection relay, and SW _{1 to} SW _n are operation switches for accident detection forced operation provided on the accident detection side (eg, push button switch), 25 (25 21 _to
5 _n ) is an OR circuit for passing the output from the relay element 21 (21 _{1 to} 21 _n ) and the signals from the switches SW _{1 to} SW _n , 2
6 is an OR circuit 2 on condition that the breaker is turned on.
5 (25 _{1 to} 25 _n ) is a sequence logic circuit which energizes the relay RY2 by a signal from the signal.

However, the forced operation on the main detection relay 1 side can be performed by turning on the switch SW _M by performing element selection by software.

The forced operation of the accident detection relay 2 side is as follows.
Elements are selected by selecting the switches SW _{1 to} SWn by the required number of elements.

[0007]

By the way, the above-mentioned conventional device has the following problems.

(1) Forced operation input must be performed from the main detection side and the accident detection side, respectively.

(2) The accident detection side needs a switch according to the number of elements.

(3) The accident detection relay board must be individually designed according to the number of elements. In other words, the accident detection relay board cannot be standardized.

The present invention has been made in view of such conventional problems, and an object thereof is to eliminate the need for element selection on the accident detection side, and to standardize an accident detection relay board. It is to provide a forced operation input method for a relay.

[0012]

SUMMARY OF THE INVENTION The present invention provides a main detection relay element output signal and a main detection relay element output signal between a main detection relay element and a logic circuit which outputs a main detection relay on condition that a circuit breaker is closed. An accident detection relay element output signal between the main detection relay that has a logical sum circuit that passes the detection forced operation signal and the logic circuit that outputs the accident detection relay on condition that the accident detection relay element and the circuit breaker are closed. In a digital relay having an accident detection relay having an OR circuit for passing an accident detection forced operation signal, an element selection unit and a main detection for soft-selecting a plurality of main detection elements and a plurality of accident detection elements on the main detection side When the main detection forced operation switch signal is input on condition that the main detection relay has the main detection element selection signal from the element selection unit, the theory of the main detection relay is explained. An AND circuit that outputs the main detection forced operation signal to the sum circuit, a transmission unit that transmits the accident detection element selection signal from the element selection unit to the accident detection relay side, and an accident detection forced operation switch on the accident detection side When the accident detection compulsory operation switch signal is input to the accident detection relay on condition that there is a reception unit that receives the transmission signal and an accident detection element selection signal from the reception unit, the main detection compulsion is forced to the OR circuit. An AND circuit for outputting an operation signal is provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the figure, the same components as those shown in FIG. 2 of the related art are designated by the same reference numerals and their duplicate description will be omitted.

Reference numeral 12 'is an element selection section provided on the main detection side, so that n element selections on the accident detection side can be applied in accordance with the software selection of m elements conventionally performed on the main detection side. The element selection is set to m + n, and the element selection information is output to the main detection relay side.

Reference numeral 13 denotes elements 1 to n from the element selection unit 12 '.
The element selection information of (1) is serially transmitted to the accident detection relay side via the serial transmission bus B, and the reference numeral 23 is a reception section that receives and outputs the element selection information from the transmission path B.

SW _M and SW _F are switches for main detection and accident detection forced operation, respectively, and 14 is an element selection unit 1.
This is a logical product circuit that outputs to the logical sum circuit 15 when the signal of the switch SW _M is input on condition that there is element selection information of elements 1 to m from 2 '. Reference numeral 24 is a logical product circuit which outputs to the logical sum circuit 25 on condition that there is element selection information from the transmission unit 23. Other configurations are the same as those of the conventional FIG.

With the above-described structure, when the switch SW _M is pressed, the main detection relay outputs a forced operation via the logic circuits 14, 15 and 16 on condition that there is element selection information, and the relay RY1 is output. Is activated.

When the switch SW _F is pressed, the logic circuits 24, 25 and 2 are provided on condition that there is the element selection information 1 to n.
The accident detection relay outputs the forced operation via the relay R
Y2 is activated.

Therefore, when the switches SW _M and SW _F are pressed to energize the relays RY1 and RY2 together, the contact r
The trip coil 3 is energized via y1 and ry2 to trip the circuit breaker.

[0020]

Since the present invention is configured as described above, the following effects can be obtained.

(1) The element selection means consisting of a plurality of switches on the accident detection side is not required.

(2) Therefore, the individual board design based on the number of elements becomes unnecessary not only on the main detection side but also on the accident detection side. Therefore, standardization of the accident detection relay board is planned.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a relay configuration according to an embodiment.

FIG. 2 is an explanatory diagram of a relay configuration according to a conventional example.

FIG. 3 is a block diagram showing details of a conventional example.

[Explanation of symbols]

1 ... main detection relay 2 ... accident detection relay 3 ... trip coil 11, 21 ... relay elements 12, 12 '... element selection unit 13 ... transmitter unit 23 ... receiver unit B ... transmission circuit _{SW M, SW F, SW 1} ~SW _m … Operation switch for forced operation.

Claims (1)

[Claims] 1. A logical sum that passes a main detection relay element output signal and a main detection forced operation signal between the main detection relay element and a logic circuit that outputs the main detection relay on condition that the breaker is closed. Pass the accident detection relay element output signal and the accident detection forced operation signal between the main detection relay that has a circuit and the logic circuit that outputs the accident detection relay on condition that the accident detection relay element and the circuit breaker are turned on. In a digital relay having an accident detection relay having an OR circuit, a main detection side is provided with an element selection section for soft selection of a plurality of main detection elements and a plurality of accident detection elements and a main detection forced operation switch. When the main detection forced operation switch signal is input on condition that the relay has the main detection element selection signal from the element selection unit, the main detection forced operation is performed to the OR circuit of the main detection relay. Signal output circuit and a transmitter for transmitting the accident detection element selection signal from the element selection unit to the accident detection relay side, and an accident detection forced operation switch on the accident detection side. A receiver for receiving the transmission signal,
When the accident detection forced operation switch signal is input on condition that there is an accident detection element selection signal from this receiving unit, a logical product circuit is provided for outputting a main detection forced operation signal to the OR circuit. Digital relay forced operation input method.