JP2000166077A - Protective relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify failures without causing erroneous operations or malfunctions due to erroneous reading of the position of a display selector switch or incorrect setting, attributed to the failure of the display selector switch. SOLUTION: This device is provided with a setting switch 7 for permitting the operating level of an output circuit to be set from the outside, a numeral display means 8 controlled by an arithmetic processing circuit, a display selector switch 9 for switching the types of display of the numeral display means 8, and a display sorting means 10 for displaying the types of display of the numeral display means 8, wherein the positioning condition of the setting switch identified by the arithmetic processing circuit is displayed on the numeral display means 8 in the form of a figure corresponding to the respective positioning conditions. Every time the condition of the display selector switch is updated from an off to on state, the order of displayed types of the numeral display means is replaced with that of the predetermined display types. The display sorting means 10 in matching with the displayed types of the numeral display means is turned on, and the display sorting means 10 which is not in matching with the displayed types of the numeral display means is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to a protective relay for detecting an accident in a power system according to a current magnitude / phase condition. In particular, an input voltage / current is subjected to A / D conversion after passing through a predetermined analog conversion circuit, and is taken into an arithmetic processing circuit as a logic signal. The present invention relates to a protection relay having an arithmetic processing circuit for determining an operation by performing a predetermined arithmetic processing.

[0002]

2. Description of the Related Art A conventional protection relay having an arithmetic processing circuit has a plurality of setting switches for operating levels and the like. When the setting state of each setting switch is switched by a numerical display LED, for example, a 7-segment LED, The display changeover switch for selecting the display is used, and which setting switch is being displayed is determined by the position of the display changeover switch.

[0003]

According to the above prior art, when there are a plurality of operation level setting switches, a numerical display LED, for example, a 7-segment display, may be misplaced due to an incorrect position of the display switch or a defective display switch. The setting state of the setting switch different from the setting switch that should have been switched to the display is displayed on the LED, and there is a possibility that a malfunction or a malfunction may occur due to an incorrect setting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and does not cause a malfunction or malfunction due to an incorrect setting due to a wrong view of a position of a display changeover switch or a defective display changeover switch. It is an object of the present invention to provide a protective relay that can recognize the above.

[0005]

According to a first aspect of the present invention, there is provided a protection relay for detecting a system fault based on input current, voltage magnitude and phase conditions, and insulates input current and voltage. An input transformer, an analog conversion circuit for converting the signal on the secondary side of the converter to a predetermined level, and an A / A for converting the analog signal to a predetermined digital signal
A D conversion circuit, an arithmetic processing circuit for performing a predetermined arithmetic processing with a digital signal as an input, a power supply circuit for supplying a power supply voltage to each circuit, and an output circuit for receiving a determination result of the arithmetic processing circuit and outputting to the outside. A setting switch for enabling the operation level of each of the output circuits to be externally set; numerical display means controlled by the arithmetic processing circuit; a display changeover switch for switching the type of display content of the numerical display means; A display type means for indicating a type of display of the display means; a setting switch position state recognized by the arithmetic processing circuit is displayed on the numerical value display means as a numerical value corresponding to each setting switch position state; Each time is updated from OFF to ON, the display type of the numerical value display means is changed to a predetermined display type, and the numerical value display means is changed. Lights the matched display type means a 示種 another and so as to turn off the display type means a numeric display means display type and mismatch.

According to a second aspect of the present invention, there is provided a protective relay according to the first aspect, wherein the numerical value display means and the display type means are always in an off state, and the display changeover switch is updated from OFF to ON. The numerical value display means and the display type means are turned on for a predetermined time.

According to a third aspect of the present invention, in the protective relay according to the first aspect, the numerical value display means and the display type means are always turned off, and when there is a change in the setting switch state, the change is made. The position state of the setting switch that has been changed is displayed on the numerical value display means, and the display type means that matches the type of the setting switch that has changed is turned on for a predetermined time.

According to a fourth aspect of the present invention, in the protective relay according to the first aspect, the display type of the numerical value display means updated by the display changeover switch is set to a non-lighting state other than the setting switch state display. .

According to a fifth aspect of the present invention, in the protective relay according to the first aspect, even when the state of the display changeover switch is not updated from OFF to ON, when the state of the setting switch changes, The position state after the change of the setting switch is displayed on the numerical value display means, the display type means matching the numerical display means display type is turned on, and the display type means not matching the numerical display means display type is turned off. I made it.

According to a sixth aspect of the present invention, in the protection relay according to the first aspect, the display type of the numerical value display means updated by the display changeover switch includes an input voltage value and an input other than a setting switch state display. Display type of current value is provided.

According to a seventh aspect of the present invention, in the protection relay according to the first aspect, an abnormality means for displaying an abnormal state controlled by the arithmetic processing circuit is provided, and the ON state of the display changeover switch is set to a predetermined value. When the time is exceeded, it is determined that the display changeover switch is abnormal, and the abnormal means is turned on.

The protection relay according to claim 8 of the present invention is characterized in that, in claim 1, a setting completion switch for making the setting switch state effective is provided, and the setting switch recognized by the arithmetic processing circuit is provided. The position status is displayed on the numerical value display means as a value corresponding to each setting switch position status, and when there is a change in the setting switch status,
The value corresponding to the changed setting switch position state is blinked on the numerical value display means at a constant cycle, and when the setting completion switch is turned on, the setting switch state is updated to the changed setting switch position and In addition, a numerical value according to the setting switch position state after the change, which was blinkingly displayed on the numerical value display means at a constant cycle, is continuously displayed.

According to a ninth aspect of the present invention, in the protection relay according to the eighth aspect, when the numerical value display means and the display type means are always in an off state and the display changeover switch is updated from OFF to ON, The numerical value display means and the display type means are turned on for a predetermined time.

According to a tenth aspect of the present invention, in the protection relay according to the eighth aspect, the numerical value display means and the display classification means are always in a non-lighting state, and when the setting switch state is changed, there is no change. The position state of the setting switch is displayed on the numerical value display means, and the display type means corresponding to the type of the setting switch that has changed is turned on for a predetermined time.

The protection relay according to claim 11 of the present invention is characterized in that, in claim 8, even if the state of the display changeover switch is not updated from OFF to ON, if the setting switch state changes, The position state after the change of the setting switch is displayed on the numerical value display means, the display type means that matches the display type of the numerical value display means is turned on, and the display type means that does not match the display type of the numerical value display means is turned off. I did it.

According to a twelfth aspect of the present invention, in the protection relay according to the eighth aspect, when the setting completion switch is turned on, the state of the setting switch being displayed on the numerical value display means is updated. At the same time, the state of the setting switch not displayed on the numerical value display means is not updated.

According to a thirteenth aspect of the present invention, in the protection relay according to the eighth aspect, the display type of the numerical value display means updated by the display changeover switch is provided with a non-lighting state other than the setting switch state display. .

The protective relay according to claim 14 of the present invention is characterized in that, in claim 8, the display type of the numerical display means updated by the display changeover switch includes an input voltage value and an input other than a setting switch state display. Display type of current value is provided.

The protection relay according to claim 15 of the present invention is characterized in that, in claim 8, an abnormality means for displaying an abnormal state controlled by the arithmetic processing circuit is provided, and the ON state of the display changeover switch is set to a predetermined value. When the time is exceeded, it is determined that the display changeover switch is abnormal, and the abnormal means is turned on.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] (corresponding to [Claim 1]) FIG. 1 is a block diagram of a protective relay according to a first embodiment of the present invention. In FIG. 1, 1 is an input transformer, 2 is an input analog circuit, 3 is an A / D conversion circuit, 4 is an arithmetic processing circuit, 5 is a power supply circuit, 6 is a relay circuit, and 7 (7-1, 7-2,
7-3, 7-4) are setting switches, 8 is 7 segment LE
D, 9 are display switches, 10 (10-1, 10-2, 10-3, 10-4)
Is a display type LED, for example.

Then, the input current / voltage is insulated by the input transformer 1, and the signal on the secondary side of the input transformer 1 is input to the input analog circuit 2 and converted into an analog signal of a predetermined level. An analog signal output from the input analog circuit 2 is input to an A / D conversion circuit 3 and converted into a predetermined digital signal. This digital signal is taken into an arithmetic processing circuit 4 and performs predetermined arithmetic processing. .

The power supply circuit 5 uses the input current and voltage as the power supply voltage inside the protection relay, and supplies a stabilized voltage to each circuit. The relay circuit 6 outputs a contact output to the outside in response to the operation processing result of the operation processing circuit 4. Setting switch 7
(Setting switches 7-1 to 7-4) are switches that enable the operation level and the like to be externally set, and the switch state is input to the arithmetic processing circuit 4. 7 segment L
The ED 8 is controlled by the arithmetic processing circuit 4 and displays a predetermined numerical value.

The display changeover switch 9 is a 7-segment LE
D8 is an ON / OFF switch for switching the type of display content, and the switch state is input to the arithmetic processing circuit 4. The display type LED 10 (display type LED 10-1 to display type LED 10-4) is controlled by the arithmetic processing circuit 4 and has a number corresponding to the type displayed on the 7-segment LED 8.
It is a protection relay composed of LEDs indicating the display type of the segment LED 8. In the above embodiment, the description has been made using the LED and the 7-segment LED.
Any number can be used as long as it can display the number "9" to the outside (the same applies to the following description).

FIG. 2 is a flowchart of the protection relay according to the first embodiment. The setting position status of one of the setting switches 7-1 to 7-4 recognized by the arithmetic processing circuit 4 is always displayed on the 7-segment LED 8 as a numerical value corresponding to the switch position status. The state of the setting switch recognized by the processing circuit 4 can be externally confirmed (step S21).

Display type LED 10-1 to display type LED 10-4
Corresponds to the setting switches 7-1 to 7-4, respectively, and the 7-segment L recognized by the arithmetic processing circuit 4
The display type LED 10 corresponding to the type of the setting switch 7 displayed on the ED 8 is turned on (step S22), and the display type LED 10 corresponding to the type of the setting switch not displayed on the 7-segment LED 8 is turned off (step S23). For example, the state of the setting switch 7-1 is changed to 7-segment LED8.
, Only the display type LED 10-1 is turned on. Thus, the type of the setting switch 7 displayed on the 7-segment LED 8 can be externally confirmed.

From this state, every time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON (step S24), the type of the setting switch 7 displayed on the 7-segment LED 8 is The display is switched in the order of setting switch 7-1 → setting switch 7-2 → setting switch 7-3 → setting switch 7-4 → setting switch 7-1 in a predetermined display order, and the state of all setting switches 7 Can be confirmed from outside.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

[Second Embodiment] (corresponding to [Claim 2]) FIG. 3 is a flowchart of a protective relay according to a second embodiment. The hardware configuration according to the present embodiment is the same as that in FIG. First, the timer is set (step S31), and it is determined whether the timer value is counted up (step S32). One of the setting switches 7-1 to 7-4 recognized by the arithmetic processing circuit 4
The setting position status of the two setting switches is a numerical value corresponding to the switch position status.
8 is displayed for a predetermined time (step S33).
The state of the setting switch recognized by the user can be confirmed from outside.

Display type LED 10-1 to display type LED 10-4
Corresponds to the setting switches 7-1 to 7-4, respectively, and the 7-segment L recognized by the arithmetic processing circuit 4
The display type LED 10 corresponding to the type of the setting switch 7 displayed on the ED 8 is turned on for a predetermined time (step S34).
The display type LED 10 corresponding to the type of the setting switch not displayed on the segment LED 8 is turned off (step S
35). For example, when the state of the setting switch 7-1 is displayed on the 7-segment LED 8, only the display type LED 10-1 is turned on for a predetermined time. Thus, 7 segment LED
The type of the setting switch 7 being displayed on 8 can be confirmed from outside.

Here, the timer is counted (step S3).
6) It is determined whether the display changeover switch 9 is turned from OFF to ON (step S37).
Returning to step S32, the above processing is repeated. If the timer value is counting up (step S32),
The process moves to step S38, where the 7-segment LED 8 that has been lit is turned off.

From this state, each time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON, the type of the setting switch 7 displayed on the 7-segment LED 8 is changed to a predetermined display. The display is switched in the order of setting switch 7-1 → setting switch 7-2 → setting switch 7-3 → setting switch 7-4 → setting switch 7-1, and the 7-segment LED 8 and the display type LED 10 are set for a predetermined time. When the lights are turned off after the lapse of time, the 7-segment LED 8 and the display type LED 8 are turned on again for a predetermined time, and the states of all the setting switches 7 can be externally confirmed.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting due to the defect of the device can be prevented. Further, since the 7-segment LED 8 and the display type LED 10 are turned on only for a predetermined time, the energy for turning on the 7-segment LED 8 and the display type LED 10 can be reduced.

[Third Embodiment] (corresponding to [Claim 3]) FIG. 4 is a flowchart of a protection relay according to a third embodiment. The hardware configuration according to the present embodiment is the same as that in FIG. First, a timer is set (step S41), and it is determined whether the timer value is counted up (step S42). One of the setting switches 7-1 to 7-4 recognized by the arithmetic processing circuit 4
The setting position status of the two setting switches is a numerical value corresponding to the switch position status.
8 is displayed for a predetermined time (step S43).
The state of the setting switch recognized by the user can be confirmed from outside.

Display type LED 10-1 to display type LED 10-4
Corresponds to the setting switches 7-1 to 7-4, respectively, and the 7-segment L recognized by the arithmetic processing circuit 4
The display type LED 10 corresponding to the type of the setting switch 7 displayed on the ED 8 is turned on for a predetermined time (step S44).
The display type LED 10 corresponding to the type of the setting switch not displayed on the segment LED 8 is turned off (step S
45). For example, when the state of the setting switch 7-1 is displayed on the 7-segment LED 8, only the display type LED 10-1 is turned on for a predetermined time. Thus, 7 segment LED
The type of the setting switch 7 being displayed on 8 can be confirmed from outside.

Here, the timer is counted (step S4).
6) It is determined whether the display changeover switch 9 is OFF → ON (step S47).
Returning to step 42, the above processing is repeated. If the timer value has counted up (step S42), the process proceeds to step S42.
The process proceeds to 48, where the 7-segment LED 8 is turned off. Then, it is determined whether or not the positions of the setting switches 7-1 to 7-4 have been changed (step S49). If the positions have been changed, a timer is set (step S491), and the processing from step S47 onward is repeated. If the positions of the switches 7-1 to 7-4 have not been changed, the processing from step S47 is repeated without setting the timer.

From this state, every time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON, the type of the setting switch 7 displayed on the 7-segment LED 8 is changed to a predetermined display. Change the display in the order of setting switch 7-1 → setting switch 7-2 → setting switch 7-3 → setting switch 7-4 → setting switch 7-1.
The states of all setting switches 7 can be externally confirmed.

Here, when the 7-segment LED 8 and the display type LED 10 are turned off after a predetermined time has elapsed, the position state of any of the setting switches 7-1 to 7-4 is changed. In this case, the 7-segment LED 8 and the display type LED 10 are turned on again for a predetermined time.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting due to the defect of the device can be prevented. Further, since the 7-segment LED 8 and the display type LED 10 are turned on only for a predetermined time, the energy for turning on the 7-segment LED 8 and the display type LED 10 can be reduced.

[Fourth Embodiment] (corresponding to [Claim 4]) FIG. 5 is a flowchart of a protective relay according to a fourth embodiment. The hardware configuration according to the present embodiment is the same as that in FIG. In the present embodiment, unless the setting switches 7-4, 7-3, and 7-2 have changed their positions (steps S51, S52, and S53), the setting switches 7-1 recognized by the arithmetic processing circuit 4 are not changed. The setting position state of one of the setting switches 7-4 is displayed on the 7-segment LED 8 as a numerical value corresponding to the switch position state (step S54). The status can be confirmed from outside.

Display type LED 10-1 to display type LED 10-4
Corresponds to the setting switches 7-1 to 7-4, respectively, and the 7-segment L recognized by the arithmetic processing circuit 4
The display type LED 10 corresponding to the type of the setting switch 7 displayed on the ED 8 is turned on (step S55), and the display type LED 10 corresponding to the type of the setting switch not displayed on the 7-segment LED 8 is turned off (step S56). For example, the state of the setting switch 7-1 is changed to 7-segment LED8
, Only the display type LED 10-1 is turned on. Thus, the type of the setting switch 7 displayed on the 7-segment LED 8 can be externally confirmed.

From this state, each time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON, the type of the setting switch 7 displayed on the 7-segment LED 8 is changed to a predetermined display. Change the display in the order of setting switch 7-1 → setting switch 7-2 → setting switch 7-3 → setting switch 7-4 → setting switch 7-1.
The states of all setting switches 7 can be externally confirmed.

Here, the state of the display changeover switch 9 is OF
Even if it is not updated from F to ON, the setting switch 7-1
When there is a change in the switch position state among the setting switches 7-4, the changed position state of the changed setting switch 7 is displayed on the 7-segment LED 8 and the setting switch being displayed on the 7-segment LED 8 7
Is turned on, and the display type LED 10 corresponding to the setting switch 7 not displayed on the 7-segment LED 8 is turned off.

For example, when the position of the setting switch 7-3 is changed while the state of the setting switch 7-1 is displayed on the 7-segment LED 8, the position state after the setting switch 7-3 is changed is displayed on the 7-segment LED 8. Along with
The display type LED 10-1 is turned off and the display type LED 10-3 is turned on. If the display changeover switch 9 is not ON from OFF, the above operation is repeated (step S57).

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, so that the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

In addition, a change in the state of the setting switch 7 other than the display changeover switch 9 is detected, and the changed setting switch 7
Can be displayed on the 7-segment LED 8, it is possible to improve operability and further prevent erroneous settings due to a defective display changeover switch.

[Fifth Embodiment] (corresponding to [Claim 5]) FIG. 6 is a block diagram of a protection relay according to a fifth embodiment of the present invention. In FIG. 6, the same parts as those in FIG. In the present embodiment, the difference from FIG. 1 is that a display type LED 10-5 is provided.
When the 7-segment LED 8 is turned off, the newly provided display type LED 10-5 for turning off the light is turned on, and the display types LED 10-1 to 10-4 other than those for turning off the light are turned off. Other configurations are the same as those in FIG.

FIG. 7 is a flow chart of the protection relay according to the fifth embodiment. The setting position status of one of the setting switches 7-1 to 7-4 recognized by the arithmetic processing circuit 4 is always displayed on the 7-segment LED 8 as a numerical value corresponding to the switch position status. The state of the setting switch recognized by the processing circuit 4 can be externally confirmed.

Display type LED 10-1 to display type LED 10-4
Correspond to the setting switches 7-1 to 7-4, respectively. The display type LED 10-5 is for indicating that the 7-segment LED 8 is off (step S72), and is recognized by the arithmetic processing circuit 4. Of the setting switch 7 displayed on the displayed 7-segment LED 8 and the 7-segment LED 8
Turn on the display type LED 10 that matches the turn-off type of
The display type LED 10 corresponding to the type of the setting switch not displayed on the segment LED 8 and the type of extinguishing of the 7-segment LED 8 is turned off (step S73).

For example, when the state of the setting switch 7-1 is displayed on the 7-segment LED 8, the display type LED 10
Turn on only -1. Thus, 7 segment LED8
Of the setting switch 7 and the 7-segment LE displayed
The on / off state of D8 can be confirmed from outside.

From this state, every time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON, the type of the setting switch 7 to be displayed on the 7-segment LED 8 is changed to a predetermined display. Setting switch 7-1 → Setting switch 7-2 → Setting switch 7-3 → Setting switch 7-4 → 7-segment LED 8 turns off → Setting switch
The display is switched in the order of 7-1, and the state of all the setting switches 7 and the state where the 7-segment LED 8 is off can be checked from the outside.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented. Further, since the 7-segment LED 8 can be arbitrarily turned off, the energy for displaying the 7-segment LED 8 can be reduced when it is not necessary to display the 7-segment LED 8 for a long time.

[Sixth Embodiment] (corresponding to [Claim 6]) FIG. 8 is a block diagram of a protection relay according to a sixth embodiment of the present invention. 8, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description will be omitted. 8 differs from FIG. 1 in that display type LEDs 10-5 and 10-6 are provided. That is, in the present embodiment, the display type LED 10-5
The display type LED 10-6 displays the input current value. In short, the setting switch 7 displayed on the 7-segment LED 8 recognized by the arithmetic processing circuit 4 displays the current value and the voltage value together with the type of the display switch being set, and the other configuration is shown in FIG. Is the same as

FIG. 9 is a flow chart of the protection relay according to the sixth embodiment. The setting position status of one of the setting switches 7-1 to 7-4 recognized by the arithmetic processing circuit 4 is always displayed on the 7-segment LED 8 as a numerical value corresponding to the switch position status. The state of the setting switch recognized by the processing circuit 4 can be externally confirmed.

Display type LED 10-1 to display type LED 10-4
Corresponds to the setting switches 7-1 to 7-4, respectively. The display type LED 10-5 corresponds to the input current value display, and the display type LED 10-6 corresponds to the input voltage value display. The display type LED 10 corresponding to the type, input current value, and input voltage value type of the setting switch 7 being displayed on the 7-segment LED 8 recognized by 4 is turned on. Display type LED10 corresponding to input current value and input voltage value type
Turn off the light. For example, when the state of the setting switch 7-1 is displayed on the 7-segment LED 8, the display type LED 10
Turn on only -1. Thus, 7 segment LED8
, The type of the setting switch 7 and the state of the input current value and the input voltage value can be confirmed from the outside.

From this state, each time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON, the type of the setting switch 7 to be displayed on the 7-segment LED 8 is changed to a predetermined display. Setting switch 7-1 → Setting switch 7-2 → Setting switch 7-3 → Setting switch 7-4 → Input current value → Input voltage value → Setting switch 7-
The display is switched in the order of 1 so that the state of all the setting switches 7, the input current value and the input voltage value can be confirmed from the outside.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented. Also, since the input current value and input voltage value can be checked from the outside, it can be operated without connecting an ammeter and voltmeter outside the protection relay during a maintenance test of the protection relay.
Since a non-operation can be confirmed, work efficiency is improved.

[Seventh Embodiment] (Corresponding to [Claim 7]) FIG. 10 is a block diagram of a protection relay according to a seventh embodiment of the present invention. In FIG. 10, the same portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 10 differs from FIG. 1 in that an abnormal LED 11 is provided, and when a failure occurs in the display changeover switch 9, this is turned on. Other configurations are the same as those in FIG.

FIG. 11 is a flow chart of the protection relay according to the seventh embodiment. In FIG. 11, setting switches 7-1 to 7-1
Steps S21 to S23 indicating the display and extinguishing of 7-4 are the same as those already described, and the description thereof will be omitted, and only different parts will be described.

Here, when the display changeover switch 9 is updated from OFF to ON (step S111), and when the ON state exceeds a predetermined time (step S114), the state of the display changeover switch 9 is changed from ON to ON. Since it does not return to OFF, it is determined that the display changeover switch 9 is defective, and the abnormality L
By turning on the ED 11 (step S115), it is possible to externally confirm that the display changeover switch 11 is abnormal.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON (step S116). , 7 segment LED8
The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented. Further, when a failure or the like occurs in the display changeover switch 9, the abnormality can be notified to the outside by turning on the abnormality LED 11.

FIG. 12 is a block diagram of a protection relay according to an eighth embodiment of the present invention. 12, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description will be omitted. 12 differs from FIG. 1 in that a setting completion switch 12 is provided, which is an ON / OFF switch for duplication to make the setting completion switch 7 effective.

FIG. 13 is a flow chart of the protection relay according to the eighth embodiment. The setting position state of one of the setting switches 7-1 to 7-4 recognized by the arithmetic processing circuit 4 is always displayed on the 7-segment LED 8 as a value corresponding to the switch position state. If there is a change in the setting position state of the switch 7 (step S131), the changed setting switch 7
7-segment LED8
Is blinked at a fixed cycle (step S133).
3.) It is possible to externally confirm that the setting switch 7 has been changed and the position of the setting switch 7 after the change.

In this state, the setting completion switch 12 is turned on.
When the state becomes the state (step S132), the setting position state of the setting switch 7 recognized by the arithmetic processing circuit 4 is updated to the setting position state of the setting switch 7 after the change, and the 7-segment LED 8 is switched to the fixed period. The numerical value corresponding to the position state after the change of the setting switch 7, which was blinking, is continuously displayed (step S138).
). The other steps S134, S135 and S136 are as described above.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

When the setting switch 7 is changed, it is possible to confirm that the setting including the changed position of the setting switch 7 has been changed from the outside. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented.

[Ninth Embodiment] (corresponding to [Claim 9]) FIG. 14 is a flowchart of a protection relay according to a ninth embodiment. The hardware configuration according to the present embodiment is shown in FIG.
The description is omitted because it is the same as 12. Figures 14 and 13 (Figure 12
Is different from that of the first embodiment in that steps S141, S142, S143, and S144 are provided, and the 7-segment LED 8 and the display type LED 10 are turned on only for a predetermined time. Others are the same as FIG.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

If the setting switch 7 is changed, it is possible to confirm that the setting including the changed position of the setting switch 7 has been changed from the outside. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented. Since the 7-segment LED 8 and the display type LED 10 are turned on only for a predetermined time, the energy for turning on the 7-segment LED 8 and the display type LED 10 can be reduced.

[Tenth Embodiment] ([Claim 10]
FIG. 15 is a flowchart of the protection relay according to the tenth embodiment. Note that the hardware configuration in the present embodiment is the same as that in FIG. 12, and a description thereof will be omitted. FIG. 14 and the above figure
13 (flowchart showing the processing contents of FIG. 12) is that the 7-segment LED 8 and the display type LED 10 are turned off after the predetermined management has elapsed (step S14).
4) If the position of any of the setting switches 7-1 to 7-4 is changed (step S151), the 7-segment LED 8 and the display type L
The ED 10 is turned on again for a predetermined time (step D152), and the other points are the same as the processing in FIG.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

If the setting switch 7 is changed, it is possible to confirm that the setting including the changed position of the setting switch 7 has been changed from the outside. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented. Since the 7-segment LED 8 and the display type LED 10 are turned on only for a predetermined time, the energy for turning on the 7-segment LED 8 and the display type LED 10 can be reduced.

[Eleventh Embodiment] ([Claim 11]
FIG. 16 is a flowchart of the protection relay according to the eleventh embodiment. Note that the hardware configuration in the present embodiment is the same as that in FIG. 12, and a description thereof will be omitted. The difference between FIG. 16 and FIG. 13 is that steps S161 and S
162 and S163. Here, step S16
1 is a process for determining whether the position of the setting switch 7-4 has been changed, step S162 is for changing the position of the setting switch 7-3, and step S163 is for determining whether the position of the setting switch 7-2 has been changed. Other processing contents are the same as those in FIG.

That is, the state of the display changeover switch 9 is OFF.
Even if it is not updated from to ON (step D136),
When there is a change in the switch position state among the setting switches 7-1 to 7-4 (steps S161 and S61)
162, S163), the changed position of the setting switch 7 after the change is displayed on the 7-segment LED 8, and the setting switch 7 being displayed on the 7-segment LED 8 is displayed.
Is turned on, and the display type LED 10 corresponding to the setting switch 7 not displayed on the 7-segment LED 8 is turned off.

For example, when the position of the setting switch 7-3 is changed while the state of the setting switch 7-1 is displayed on the 7-segment LED 8, the position state after the setting switch 7-3 is changed is displayed on the 7-segment LED 8. Along with
The display type LED 10-1 is turned off and the display type LED 10-3 is turned on.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

When the setting switch 7 is changed, it can be confirmed that the setting has been changed from the outside, including the changed position of the setting switch 7, and the setting is updated by the setting completion switch 12. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented.

Then, a change in the state of the setting switch 7 other than the display changeover switch 9 can be captured and the changed state of the setting switch 7 can be displayed on the 7-segment LED 8, thereby improving operability and improving the display changeover switch. It is possible to further prevent erroneous setting due to a defect.

[Twelfth Embodiment] ([Claim 12]
FIG. 17 is a flowchart of the protection relay according to the twelfth embodiment. Note that the hardware configuration in the present embodiment is the same as that in FIG. 12, and a description thereof will be omitted. The difference between FIG. 17 and FIG. 13 is that step S171 is provided in FIG. 17 instead of step S137 in FIG. That is, in the present embodiment, the update of the switch position is performed by the 7-segment LE.
Only the setting switches that are externally confirmed by D are updated. Other processing contents are the same as those in FIG.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

When the setting switch 7 is changed, it can be confirmed that the setting including the changed position of the setting switch 7 has been changed from the outside, and the setting is updated by the setting completion switch 12, so that an incorrect setting change is performed. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented. Furthermore, since the switch position of only the setting switch 7 that is externally confirmed by the 7-segment LED 8 is updated, it is possible to further prevent erroneous setting due to a defect of the setting switch 7.

[Thirteenth Embodiment] ([Claim 13]
FIG. 18 shows a block configuration of a protection relay according to a thirteenth embodiment of the present invention. In FIG. 18, the same parts as those in FIG. 12 are denoted by the same reference numerals, and description thereof will be omitted. 18 differs from FIG. 12 in that a display type LED 10-5 is provided. And display type LED10-5 is 7 segment LED8
Indicates that the light is off. Other configurations are figures
Same as 12.

FIG. 19 is a flowchart of the protection relay according to the thirteenth embodiment. The display type LED 10-1 to the display type LED 10-4 correspond to the setting switch 7-1 to the setting switch 7-, respectively.
4 and the display type LED10-5 is 7 segment L
The ED 8 is for indicating that the light is off, and the display type LED 10 corresponding to the type of the setting switch 7 displayed on the 7-segment LED 8 recognized by the arithmetic processing circuit 4 and the off-type of the 7-segment LED 8 is turned on. Setting switch type and 7 not displayed on 7-segment LED 8
Display type LE corresponding to the light-off type of the segment LED 8
Turn off D10.

In the flowchart of FIG. 19, FIG.
13 is the same as that of FIG. 13 except that steps S191, S192, S193, and S194 are added to the flowchart of FIG. For example, when the state of the setting switch 7-1 is displayed on the 7-segment LED 8, only the display type LED 10-1 is turned on. In this manner, the type of the setting switch 7 being displayed on the 7-segment LED 8 and the lighting / off state of the 7-segment LED 8 can be confirmed from outside.

Each time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is changed from OFF to ON, the setting switch 7 displayed on the 7-segment LED 8
Setting switch 7-1, which is a predetermined display order.
→ Setting switch 7-2 → Setting switch 7-3 → Setting switch
The display is switched in the order of 7-4 → 7 segment LED 8 off → setting switch 7-1, and the state of all setting switches 7 and 7 segment LED 8 off can be confirmed from outside.

If the 7-segment LED 8 is off (step S191), the display type LED 10-5 is turned on (step S192), and the display types LED 10-1 to 10-4 other than those for turning off the 7-segment LED are turned off. Yes (step S193
).

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

When the setting switch 7 is changed, it is possible to confirm that the setting including the changed position of the setting switch 7 has been changed from the outside. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented. Since the 7-segment LED 8 can be arbitrarily turned off, the energy for displaying the 7-segment LED 8 can be reduced when it is not necessary to display the 7-segment LED 8 for a long time.

[Fourteenth Embodiment] ([Claim 14]
FIG. 20 is a block diagram of a protective relay according to a fourteenth embodiment of the present invention. 20, the same components as those in FIG. 12 are denoted by the same reference numerals, and description thereof will be omitted. 20 is different from FIG. 18 in that display type LEDs 10-5 and 10-6 are provided. The display type LED 10-5 displays the input current value, and the display type LED 10-6 displays the input voltage value. Other configurations are the same as those in FIG.

FIG. 21 is a flowchart of the protection relay according to the fourteenth embodiment. The display type LED 10-1 to the display type LED 10-4 correspond to the setting switch 7-1 to the setting switch 7-, respectively.
The display type LED 10-5 corresponds to the input current value display, and the display type LED 10-6 corresponds to the input voltage value display.
8, a display type LED 10 corresponding to the type of the setting switch 7 being displayed, the input current value, and the input voltage value type is turned on.
The display type LED 10 corresponding to the type of the setting switch, the input current value and the input voltage value type that is not displayed on the 7-segment LED 8 is turned off.

FIG. 13 (FIG. 12)
13 is different from the flowchart of FIG. 13 in that the input current value display process including steps S 211, S 212, S 213, and S 214 and the subsequent input voltage value display process (same as the input current value display) are performed. However, the input current value is used as the input voltage value, and the procedure is exactly the same).

For example, when the state of the setting switch 7-1 is displayed on the 7-segment LED 8, the display type LED 10
Turn on only -1. Thus, 7 segment LED8
, The type of the setting switch 7 and the state of the input current value and the input voltage value can be confirmed from the outside. Here, every time the state of the display changeover switch 9 recognized by the arithmetic processing circuit 4 is updated from OFF to ON, a 7-segment LED is displayed.
8 and the type of the input current value and the input voltage value are set in a predetermined display order.
1 → Setting switch 7-2 → Setting switch 7-3 → Setting switch 7-4 → Input current value → Input voltage value → Setting switch 7-1 The display is switched in this order, and all setting switches 7 and input current value, The state of the input voltage value can be confirmed from outside.

To summarize the above, starting from the end of the display of the setting switch 7-1, the setting switch
When the display of 7-2 → setting switch 7-3 → setting switch 7-4 is completed, the input current value is displayed (step S211).
, S212, S213, and S214), the same input voltage value display (the same process as above) is performed, and the process returns to the first process.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

Further, if the setting switch 7 is changed, it can be confirmed that the setting including the changed position of the setting switch 7 has been changed from the outside, and the setting is updated by the setting completion switch 12. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented. Furthermore, since the input current value and input voltage value can be checked from the outside, operation and non-operation can be checked without connecting an ammeter and voltmeter outside the protection relay during a maintenance test of the protection relay, etc. improves.

[Fifteenth Embodiment] ([Claim 15]
FIG. 22 is a block diagram of a protection relay according to a fourteenth embodiment of the present invention. In FIG. 22, the same portions as those in FIG. 12 are denoted by the same reference numerals, and description thereof will be omitted. 22 differs from FIG. 12 in that an abnormal LED 11 is provided. The abnormality LED 11 indicates an abnormality of the display changeover switch 9. Other configurations are the same as those in FIG.

FIG. 23 is a flowchart of the protection relay according to the fifteenth embodiment. Referring to FIG.
The processing in step S138 is the same as in FIG. When the display changeover switch 9 is updated from OFF to ON (step S136) and the ON state exceeds a predetermined time (step S232), the state of the display changeover switch 9 does not return from ON to OFF. By determining that the display changeover switch 9 is defective and turning on the abnormal LED 11 (step S233), it is possible to externally confirm that the display changeover switch 9 is abnormal.

According to the present embodiment, the state of the setting switch 7 recognized by the arithmetic processing circuit 4 can be externally confirmed, and the state of the display changeover switch 9 is updated from OFF to ON, whereby the 7-segment LED 8 The type of the setting switch 7 to be displayed can be switched, and the display type LED 10 corresponding to the type of the setting switch 7 being displayed on the 7-segment LED 8 is turned on. Erroneous operation and erroneous non-operation due to erroneous setting can be prevented.

Further, if the setting switch 7 is changed, it can be confirmed that the setting including the changed position of the setting switch 7 has been changed from the outside, and the setting is updated by the setting completion switch 12, so that an incorrect setting change is performed. Is prevented from being set erroneously due to a defect of the setting switch 7, and erroneous operation or erroneous operation due to a defect of the setting switch 7 can be prevented. Further, when a failure or the like occurs in the display changeover switch 9, the abnormality LED 11 is turned on to notify the abnormality to the outside.

[0099]

As described above, according to the present invention, the state of the setting switch such as the operation level can be externally confirmed, and the state of the display changeover switch is updated from OFF to ON, so that the display is displayed on the display means. The type of the setting switch can be switched, and the display type display unit corresponding to the type of the setting switch displayed on the display unit is turned on. Malfunction / malfunction due to setting can be prevented.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a protective relay according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing processing contents according to the first embodiment;

FIG. 3 is a flowchart showing processing contents according to the second embodiment;

FIG. 4 is a flowchart showing processing contents of a third embodiment.

FIG. 5 is a flowchart showing processing contents of a fourth embodiment.

FIG. 6 is a system configuration diagram of a protection relay according to a fifth embodiment of the present invention.

FIG. 7 is a flowchart showing processing contents of a fifth embodiment.

FIG. 8 is a system configuration diagram of a protective relay according to a sixth embodiment of the present invention.

FIG. 9 is a flowchart showing processing contents of a sixth embodiment.

FIG. 10 is a system configuration diagram of a protective relay according to a seventh embodiment of the present invention.

FIG. 11 is a flowchart illustrating the processing content of the seventh embodiment.

FIG. 12 is a system configuration diagram of a protective relay according to an eighth embodiment of the present invention.

FIG. 13 is a flowchart illustrating processing content of the eighth embodiment.

FIG. 14 is a flowchart illustrating processing contents according to the ninth embodiment.

[0027] FIG. 15 is a flowchart illustrating processing contents according to the tenth embodiment.

FIG. 16 is a flowchart showing processing contents of the eleventh embodiment.

FIG. 17 is a flowchart illustrating processing contents of a twelfth embodiment.

FIG. 18 is a system configuration diagram of a protective relay according to a thirteenth embodiment of the present invention.

FIG. 19 is a flowchart illustrating the processing content of the thirteenth embodiment.

FIG. 20 is a system configuration diagram of a protective relay according to a fourteenth embodiment of the present invention.

FIG. 21 is a flowchart illustrating processing contents of a fourteenth embodiment.

FIG. 22 is a system configuration diagram of a protective relay according to a fifteenth embodiment of the present invention.

FIG. 23 is a flowchart illustrating processing content of the fifteenth embodiment.

[Explanation of symbols]

 1 input transformer 2 input analog conversion circuit 3 A / D conversion circuit 4 arithmetic processing circuit 5 power supply circuit 6 relay circuit 7-1 to 7-4 setting switch 8 7-segment LED 9 display changeover switch 10-1 to 10-4 display Type LED 11 Error LED 12 Setting complete switch

Claims (15)

[Claims] A protection relay for detecting a system fault based on input current, voltage magnitude, and phase conditions.
An input transformer for isolating a voltage, an analog conversion circuit for converting a signal on the secondary side of the converter to a predetermined level, an A / D conversion circuit for converting the analog signal to a predetermined digital signal, An arithmetic processing circuit for performing a predetermined arithmetic processing as an input; a power supply circuit for supplying a power supply voltage to each circuit; an output circuit for receiving a determination result of the arithmetic processing circuit and outputting to the outside; and an operation level of each of the output circuits A setting switch that allows the user to externally set the value, numerical display means controlled by the arithmetic processing circuit, a display changeover switch for switching the type of display content of the numerical display means, and a display type of the numerical display means. A display type means,
The setting switch position status recognized by the arithmetic processing circuit is displayed on the numerical value display means as a value corresponding to each setting switch position status, and each time the status of the display changeover switch is updated from OFF to ON, the numerical display is performed. While changing the display type of the means to the order of the predetermined display type,
A protection relay characterized by turning on a display type unit that matches a display type of a numerical display unit and extinguishing a display unit that does not match a display type of a numerical display unit. 2. The protection relay according to claim 1, wherein the numerical value display means and the display type means are always turned off, and when the display changeover switch is updated from OFF to ON, the numerical value display means and the display type are kept for a predetermined time. A protective relay characterized by lighting means. 3. The protection relay according to claim 1, wherein the numerical display means and the display classification means are always in a light-off state, and when the setting switch state changes, the position state of the changed setting switch is numerically displayed. A protection relay, wherein the display type means is turned on for a predetermined time while being displayed on the means and the type of the setting switch that has changed. 4. The protection relay according to claim 1, wherein the display type of the numerical value display means updated by the display changeover switch includes a non-lighting state other than the setting switch state display. 5. The protection relay according to claim 1, wherein, even when the state of the display changeover switch is not updated from OFF to ON, when the state of the setting switch changes, the changed position of the changed setting switch is changed. A protection relay, characterized in that a state is displayed on a numerical display means, a display type means that matches the display type of the numerical display means is turned on, and a display type means that does not match the display type of the numerical display means is turned off. 6. The protection relay according to claim 1, wherein a display type of an input voltage value and an input current value other than the setting switch status display is provided as a display type of the numerical value display means updated by the display changeover switch. Features a protective relay. 7. The protection relay according to claim 1, further comprising an abnormality means for displaying an abnormal state controlled by the arithmetic processing circuit, wherein the display changeover switch is turned on when the ON state of the display changeover switch exceeds a predetermined time. A protection relay characterized in that an abnormality is determined and an abnormal means is turned on. 8. The protection relay according to claim 1, further comprising a setting completion switch for validating the setting switch state, and changing the position state of the setting switch recognized by the arithmetic processing circuit to each setting switch position state. When the setting switch status changes, the value corresponding to the changed setting switch position status is displayed on the numerical value displaying device at a fixed cycle, and the setting completion switch is turned ON. When the state is reached, the setting switch state is updated to the changed setting switch position, and a numerical value according to the changed setting switch position state, which has been blinkingly displayed at a constant cycle on the numerical value display means, is continuously displayed. A protective relay, characterized in that: 9. The protection relay according to claim 8, wherein the numerical value display means and the display type means are always turned off, and when the display changeover switch is updated from OFF to ON, the numerical value display means and the display type means are switched for a predetermined time. A protective relay that lights up. 10. The protective relay according to claim 8, wherein
The numerical display means and the display type means are always turned off, and when there is a change in the setting switch state, the position state of the changed setting switch is displayed on the numerical display means, and the type of the changed setting switch and A protection relay, characterized in that the corresponding display classification means is turned on for a predetermined time. 11. The protective relay according to claim 8, wherein
Even when the state of the display changeover switch is not updated from OFF to ON, if the setting switch state changes, the changed position state of the changed setting switch is displayed on the numerical display means, and the numerical display means is displayed. A protection relay characterized in that a display type means that matches a display type is turned on, and a display type means that does not match a display type is turned off. 12. The protective relay according to claim 8, wherein
When the setting completion switch is turned ON, the state of the setting switch being displayed on the numerical value display means is updated, and
The state of the setting switch not displayed on the numerical value display means is not updated. 13. The protective relay according to claim 8, wherein
A protection relay characterized in that a light-off state other than a setting switch state display is provided in a display type of a numerical display means updated by a display changeover switch. 14. The protective relay according to claim 8, wherein
A protection relay, characterized in that a display type of an input voltage value and an input current value other than a setting switch status display is provided as a display type of a numerical display means updated by a display changeover switch. 15. The protective relay according to claim 8, wherein
An abnormal means for displaying an abnormal state controlled by the arithmetic processing circuit is provided, and when the ON state of the display changeover switch exceeds a predetermined time, it is determined that the display changeover switch is abnormal, and the abnormal means is turned on. Protective relay.