JPH05236632A - Automatic inspecting method for digital protective relay - Google Patents

Abstract

PURPOSE:To eliminate non-protected state of system by employing one of main protective unit and a plurality of backup protective units, constituting a digital protective relay system, as a main unit while the others as slave units and commanding inspection of the slave units through the master unit upon finish of inspection of the master unit. CONSTITUTION:A main protective unit A and a plurality of backup protective units B, C constitute a digital protective relay system. One of these units, e.g. unit A, is employed as a master unit while the others B, C are employed as slave units and inspection is started in series or parallel. Upon receiving an inspection start command, the master unit A takes in the operating conditions of the system or the slave units and then the unit A is inspected upon confirmation of starting conditions. Upon finish of inspection of unit A, the slave units B, C are started in parallel or series by means of signals 1, 2 and inspected. The slave units B, C then output an inspection lock signal 3 and an inspection answer signal 4 thus avoiding non-protected state of the system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically inspecting a digital protective relay device capable of activating automatic inspection regardless of the operating state of a system.

[0002]

2. Description of the Related Art In a two-line relay device, when the protection method is "main protection" + "reserve protection", most protection categories adopt a direction relay for main protection and a distance relay for protection.

Further, in the two-line simultaneous protection system on one board, it is not the "main protection" + "repair protection" system for each line, but
As shown in FIG. 4, "main protection unit A" + "(1 line back-up protection unit B)" + "(2 lines back-up protection unit C)" sharing both lines (1L, 2L) are used on the main protection side. 1-line and 2-line trip outputs are OR circuits OR ₁
And are output via the OR _2.

In the protective relay device of the system as shown in FIG. 4, the automatic inspection is activated for each of the units A, B and C.

[0005]

When performing ON / OFF inspection of the trip relay as an automatic inspection item of the protective relay device, it is necessary to perform trip lock so as not to output trip for performing the inspection.

When the automatic protection is arbitrarily started by ignoring the operating conditions of the system in the above-mentioned conventional protective relay device of FIG. 4, a trip lock is carried out at the time of inspection. When wrapped, there are cases where it becomes unprotected.

Therefore, in order to prevent the non-protection,
There is a problem that processing such as (1) artificially locking the activation of the inspection, (2) shifting the time when the inspection of each unit is activated, etc. must be performed.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a digital protective relay device which can be automatically inspected regardless of the operating state of the system. To provide an automatic inspection method.

[0009]

In order to achieve the above object, an automatic inspection method for a digital protective relay device according to the present invention comprises a main protection unit, a one-line backup protection unit,
In a digital type protective relay device composed of a plurality of back-up units such as a two-line back-up protection unit, one of the units is a master unit that has the initiative, and the remaining units are slave units. The setting of is set so that the inspection start of the slave unit can be executed in parallel or serially, the master unit confirms the start condition taken in by its own unit by inspection start and performs the start lock or inspection, and each slave unit executes the above After starting the inspection, the start command output from the master unit confirms the starting conditions captured in the self unit and performs the start lock or inspection to prevent simultaneous inspection of the main protection unit and the backup protection unit. It prevents the unprotected state.

[0010]

[Function] The master unit is set so that the slave unit can be inspected and activated in parallel or in series.
The master unit checks the startup conditions taken in by its own unit during inspection startup, for example, whether or not other slave units are inspected and started, and performs startup lock or inspection. Inspection will not be triggered.

Further, since each slave unit confirms the start condition taken into its own unit by the start command from the master unit, for example, whether or not the master unit is inspected and activated, the activation lock or the inspection is performed. Do not inspect the self unit during start-up.

Therefore, since the inspection of the main protection unit and the auxiliary unit are not activated at the same time or lapped, the system is not in the unprotected state at the time of inspection.

[0013]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an order of exchanging signals between units at the time of automatic inspection of a digital type protective relay device according to the two-line simultaneous protection system, and FIGS. 2 (a) and 2 (b) show the main part of the protective relay device. The inspection flow of a unit and a sub unit is shown. Further, FIG. 3 shows an inspection time chart of the main unit and the sub unit.

In FIG. 1, A is a 1-line main protection unit, B is a 1-line backup protection unit, C is a 2-line backup protection unit, and the unit A is a master and the remaining units B and C are slaves. The master unit A has a main board for inspection and activation. Signals are exchanged in the order of 1 to 4.

Next, the flow of inspection in this protective relay device will be described with reference to FIG.

When the inspection start command (time or signal) is input, the master (unit A) takes in the operating state of the system and the operating states of other slave units and confirms the starting condition (S1).

When the start condition is not satisfied, the inspection is finished and the inspection start is locked (S2). When the start condition is satisfied, the master inspects its own unit A (S3), (see FIG. 3).
(A)).

Next, the master is the slave 1 (unit B)
The confirmation of inspection start is output to (S4) (Fig. 3
(B)). On the other hand, the slave 1 confirms the inspection start-up and outputs the result as an inspection answer signal to the master (S12) (FIG. 3 (C)).

When the master confirms this answer signal, it outputs a check start command (S6). When the answer signal is not input for a certain period of time, the process of the slave 1 is skipped and the process of the slave 2 (unit C) is started.

When the inspection start command (S6) is input, the slave 1 starts the inspection of its own unit B and takes in the operating state of the system and the operating state of the master unit to confirm the starting condition (S14). When the starting condition is not satisfied, the inspection is finished and the inspection starting is locked (S15). When the start condition is satisfied, the self-unit B is inspected (S16) (Fig. 3 (d)), and the result pass / fail is output to the master as an answer (S18).
(FIG. 3 (C)).

The master inputs an answer for checking the slave 1 or, if no answer is input for a certain period of time, performs processing for the slave 2 or ending processing.

Although the above embodiment has two slave units, it can be similarly implemented even if the number of slave units is three or more. Further, although the slave units are inspected and activated serially, it goes without saying that they can be conducted in parallel.

[0024]

Since the present invention is configured as described above, it has the following effects.

(1) Automatic inspection can be started regardless of the operating state of the system.

(2) Therefore, the lock operation for the simultaneous inspection prevention operation of the main protection unit and the backup protection unit becomes unnecessary. In addition, the starting lock operation unit for each unit is unnecessary.

(3) Since the starting time is set only in the master unit, the time setting section of the slave side unit becomes unnecessary.

(4) Since the master controls the inspection of the self unit and other units, the setting of the inspection execution state can be arbitrarily set according to the method of the protective relay device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing exchange of signals between units of a protective relay device according to an embodiment.

2A and 2B are flow charts showing an inspection process of a main unit and a sub unit of a protective relay device.

FIG. 3 is an inspection time chart of the main unit and the sub unit.

FIG. 4 is an explanatory view showing a protection system of a conventional protection relay device.

[Explanation of symbols]

A ... Main protection unit, B ... 1 line backup protection unit, C
… A two-line backup protection unit.

Claims (1)

[Claims] 1. A digital protective relay device comprising a plurality of back-up units such as a main protection unit, a one-line back-up protection unit, and a two-line back-up protection unit, wherein one of the units is the master. The remaining units are set as slave units, and the remaining master units are set as slave units.The master unit settings are set so that the slave units can be inspected in parallel or serially. Then, each slave unit confirms the start condition fetched in its own unit by the start command from the master unit output after the above check and performs the start lock or check, and performs the main protection. Prevent the inspection of the unit and the backup protection unit from starting at the same time and keep them in the unprotected state. Automatic inspection method of a digital type protection relay device, characterized in that to prevent.