JPS61132028A - Protective relay unit - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a protective relay device, and particularly to a protective electrical device equipped with inspection measures when the protective device has a plurality of protection functions.

[Technical Background of the Invention] In general, protection relay devices are becoming smaller in size, and protection relay devices having multiple independent protection functions have been realized. In most cases, a dual system configuration with a function and a back-up protection function, or a dual system configuration with a first system and a second system is used. Additionally, it is customary to add an automatic inspection circuit to save labor and improve reliability in maintenance and inspection work. Automatic inspection here refers to applying a predetermined inspection input to the protective function or protective relay device at a fixed cycle.
This is a function that mainly detects malfunctions in the protective device by confirming that it exhibits a predetermined response. Therefore, automatic inspection is usually started automatically at a period determined by an automatic inspection start timer, and during automatic inspection, the trip circuit is locked and the original protection function is temporarily stopped.

Therefore, if a system accident occurs in the protected target during automatic inspection,
The protective relay device has a so-called accident response circuit that immediately stops the automatic inspection and restores the original protective function after the influence of the inspection has disappeared. There is a delay between trips. This type of automatic inspection circuit is used for life insurance:
! Functions and back-up protection functions are each equipped, and in the case of equipment with two series, each series is equipped with one, and there is a mutual interlock circuit between them for the activation of automatic inspection. , which prevents delays in the original trip time. FIG. 3 is a block diagram of a conventional protective relay device having two independent protection functions, and the conventional device will be explained using this diagram.

In FIG. 3, 1 is the first protection function, which corresponds to the main protection function or the first series of protection functions. 2 is the second
This protection function corresponds to debt protection or the second series of protection functions. 11.21 are automatic inspection start timers for the first and second protection functions, respectively, 12.22 are automatic inspection circuits for the first and second protection functions, respectively, and 13.23 are automatic inspection circuits for the first and second protection functions, respectively. 14.24 a constant use state detection circuit for detecting that the said protection III function is in a normal use state;
represent AND circuits of the first and second protection functions, respectively. In the first protection function 1, the output of the automatic inspection start timer 11 and the output of the constant use state detection circuit 23 of the second protection function are connected as inputs of the AND circuit 14, and the output of the AND circuit 14 is further connected to the automatic inspection start timer 11. It is connected to the circuit 12, and automatic inspection of the first protection function is activated when the AND condition of the AND circuit 14 is satisfied.

In the case of the second protection function, as in the case of the first protection function described above, the output of the automatic inspection start timer 21 and the output of the constant use state detection circuit 13 of the first protection function are input to the AND circuit 24. is connected, and furthermore, the output of the NO circuit 24 is connected to the automatic inspection circuit 22, and the output of the NO circuit 24 is connected to the automatic inspection circuit 22.
When the AND condition of 4 is established, automatic inspection of the second protection function is activated. In addition, each inspection start timer setting is set as protection function 1.
and protection function 2 are set so that they are not activated for inspection at the same time, but if either one of the protection functions is excluded from the constant operation state, the output of automatic inspection activation timer 11 or 21 is set to 12 or 22. so as not to be given to
It is configured to be blocked by the AN[) circuit 14 or 24. In this way, the first protection function and the second
By keeping one of the protection functions in constant use, even if the trip time of one protection function is delayed by the fault response circuit in the event of a system fault, the other protection The function is configured to provide a normal trip time.

[Problems with Frontal Technology] In the case of the conventional device having the above configuration, an automatic inspection start timer is provided for each protection function. This is an impediment not only to downsizing the protective relay device but also to simplifying the functions of the device.

[Objective of the Invention J] The present invention has been made to solve the above problems, and provides a protective relay device in which the normal trip time is ensured by any of the protective functions, and the device is simplified. It is intended to.

[Summary of the Invention 1 In the present invention, in a protective relay device having a plurality of protection functions, an automatic inspection start timer is provided only for a representative protection function, and mutually detects that other protection functions are in constant use. The automatic inspection starts from the representative protection function, and from then on, when it receives an automatic inspection completion signal and a signal indicating that it is in constant use from another protection function, it automatically inspects the next protection function in the inspection order. However, one of the plurality of protection functions is always in use to ensure a normal trip time.

[Embodiments of the Invention] Examples will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of a protective relay device according to the present invention. In FIG. 1, parts that are the same as those in FIG. 3 are given the same reference numerals, and their explanation will be omitted. Note that FIG. 1 shows a protective relay device having three independent protection functions.

In FIG. 1, 3 is the third protection function, which is newly added. Therefore, the protection functions are 1.2.
It consists of 3 pieces. The AND circuit 15 has the same function as the AND circuit 14 of the conventional example, and differs only in the number of inputs. That is, the input of the ANO circuit 15 is
The output of the automatic inspection start timer 11, the output of the constant use state detection circuit 23 of the maintenance 11 function 2, and the newly added maintenance 2
! The output of the constant use state detection circuit 33 of the function 3 is connected, the output of the AND circuit 15 is connected to the automatic inspection circuit 12, and when the ANO condition of the AND circuit 15 is satisfied, automatic inspection of the protection function 1 is started. . That is, the inspection of the protection function 1 is started only when the second and third protection functions are constantly in use. The input of the AND circuit 24 in the second protection function is 0 from the automatic inspection circuit 12, which is output when the inspection result of the protection function 1 described above is good.
A signal and the output of the constant use state detection circuit 13 of the protection function 1 are connected to the terminal, and the inspection of the automatic inspection circuit 22 is started when the N-gate condition of the AND circuit 24 is satisfied. That is, the second
The checking of the protection function is started only when the first protection function is in standby state. AND circuit 34 in the third protection function
The input is EN which is output when the inspection of protection function 2 is completed.
D signal and maintenance! 1m capacity 1 constant use/state detection circuit 1
The output of 3 is connected to the AN.

When the AND condition of the D circuit 34 is satisfied, the automatic inspection circuit 32 starts inspection. That is, the first and second protection! The third protective function is inspected only when each of the first functions is in a standby state. In short, the automatic inspection start timer is provided only for the protection function 1, and the inspection of the protection function 2 is started by the inspection OK condition of the protection function 1, and the inspection of the protection function 3 is started by the inspection END condition of the protection function 2.

Therefore, when considering a system accident that occurs during inspection of each protection function, first of all, protection function 2 and protection function 3 are always in use while protection function 1 is being inspected, so they ensure a constant trip time. In addition, during the inspection of protection function 2, there is no defect in protection function 1, and since it is always in use, a constant trip time can be secured by protection function 1 or protection function 3, and furthermore, protection function 3 can be maintained. During the inspection, a constant trip time can be ensured by protection function 1 or protection function 2 only if no inspection failure occurs in protection function 1 or protection function 2. In addition, the interlock conditions for inspection activation between each protection function are the same as the END signal, which is the output of the automatic inspection circuit 22, and the 0 signal, which is the output of the automatic inspection circuit 12, even if other conditions are added. The effect is the same even if the signal is replaced. As is clear from the above explanation, even if the number of automatic inspection start timers is reduced, it is possible to carry out inspections of multiple maintenance functions, and it is possible to carry out inspections of multiple maintenance functions, and it is possible to perform normal inspections even in the case of system failures during inspections. Trip time can be secured.

FIG. 2 is a block diagram of another embodiment of the protective relay device according to the present invention. In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the inspection starting condition for the protection function 3 is set using the output of the automatic inspection circuit of the protection function 1 and the output of the constant use state detection circuit. EN, which is the output of the automatic inspection circuit 22 in FIG.
Whereas the D signal was used, the AN port circuit 2 in Fig. 1
4, the surrounding signal which is the output of the automatic inspection circuit 12 of the protection function 1 is connected.

The other configurations are the same as in FIG. 1.

In short, the inspection condition of the protection function 3 is made the same as that of the protection function 2, and the inspection of the protection function 3 is started at the same time as the protection function 2.

Now, considering a system accident during inspection of each protection function, during inspection of protection function 1, protection function 2 and W! Since function 3 is always in use, it is possible to ensure a constant trip time, and while protection function 2 and maintenance function 3 are being inspected, protection function 1 can ensure a constant trip time.

Next, a mode of use of the above embodiment will be shown. First, when applying a balanced relay system that protects two parallel circuits of transmission lines, in each case of Figures 1 and 2, protection function 1 is the main protection function, and protection function 2 is the main protection function of the two parallel circuits. Protection function 3 is a backup protection function that protects one line behind the two parallel lines. Although only the balanced relay method for protecting two parallel power transmission lines has been described as a mode of use, it is clear that the present invention can be used for inspection other than this method.

[Effects of the Invention] As explained above, according to the present invention, when automatically inspecting a protective relay device having a plurality of independent protection functions, an automatic inspection start timer is provided for only the representative protection function so that the inspection is started first. At that time, we configured the system so that one of the protection functions is always in use and the inspections are performed sequentially while mutually confirming each other, so only one automatic inspection activation timer is required, and at the same time, system failures during inspection can be prevented. Therefore, it is possible to provide a protective relay device d that can secure a normal trip time.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of a protected forest protection device according to the present invention, FIG. 2 is a diagram of another embodiment, and FIG. 3 is a block diagram of a conventional device.

Claims (2)

[Claims] (1) In a protective relay device that has a first protection function, a second protection function, and a third protection function that can independently protect the objects to be protected, the inspection of the first protection function is performed in the second and third protection functions. The inspection of the second protection function is started by an automatic inspection start timer on the condition that each of the protection functions is in constant use, and the inspection of the second protection function is started under the condition that the first protection function is in constant use and A protective relay device characterized in that the inspection of the third protection function is started with one of the conditions being that the inspection result is good, and the inspection of the third protection function is started with the completion of the inspection of the second protection function as one of the conditions. . (2) In a protective relay device that has a first protection function, a second protection function, and a third protection function that can independently protect the objects to be protected, the inspection of the first protection function is performed by the second and third protection functions. The inspection of the second and third protection functions is started by an automatic inspection start timer on the condition that each protection function is in a constant use state, and the inspection of the second and third protection functions is started when the first protection function is in a constant use state. 1. A protective relay device that starts operation based on one of the conditions that the inspection result is satisfactory.