JPH0775246A - Distance relay device - Google Patents

Abstract

PURPOSE:To carry out protection for a self-section in a short time, by locking a self-section protective circuit when a circuit for detecting a failure in a section having a serial capacitor operates. CONSTITUTION:When a failure occurs in a section having a serial capacitor, an output of '1' is generated from a circuit (a differential protective relay) 1. The output is transmitted to an AND circuit 5 through a transmission circuit 2, a receiving circuit 3 and a NOT circuit 4 so that an output of a first stage element 6 is locked. By this means, a setting time (T4) of an on-delay timer 11 is reduced to a given level, namely T4 < operation time of differential protective relay + transmission time. Consequently, self-section protection can be carried out in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance relay device for a transmission line system, and more particularly to measures against unnecessary operation of a distance relay device installed in a section adjacent to a system having a series capacitor.

[0002]

2. Description of the Related Art FIG. 2 shows a system diagram having a series capacitor and installation of a protection relay. In FIG.
Reference numeral 15 is a series capacitor, 16a is a distance relay device installed in a section adjacent to the series capacitor, 16b and 16c are relay devices for protecting the section having the series capacitor, 17
a, 17b, 17c are CTs for inputting current, 18a, 1
Reference numerals 8b and 18c are PTs for inputting a voltage.

FIG. 3 shows a distance relay device 16a installed at the A terminal.
The first stage element 0
1, the second stage element 02, and the direction element SU, 01 is settled to operate during an accident within a distance of about 70 to 80% of its own section (between A and B), and 02 is its own section (A -B
150%) and SU is set to about 250-300%. The accident point F1 in the own section and the accident point F2 on the other side of the series capacitor in the adjacent section are shown by points in the figure.

FIG. 4 is a sequence block diagram of the distance relay device. 01 of output of element 6 and output of SU element 8
D output becomes O after T1 count of on-delay timer 11
A trip command is output via the R circuit 14. An AND of the output of the 02 element 7 and the output of the SU element 8 is output after the T2 of the on-delay timer 12, and the output of the SU element 8 is output after the T3 of the on-delay timer 13 via the OR circuit 14. On-delay timer 11, 12, 1
The settling times T1, T2, T3 of 3 are set as follows, respectively. T1 has a reclosing circuit installed in its section,
It is set so that the time will not be up when an accident is removed by another device not shown (commonly called the main protection device). Similarly, T3 is coordinated with T2 of the adjacent section so that T2 does not time up when the accident in the adjacent section is cleared.

When an accident occurs at point F1 of the own section shown in FIG. 2, all 01, 02, and SU elements operate as shown in FIG. 3, so that the on-delay timer 11 shown in FIG. Trip command is output. Further, in the case of the accident at the point F2 shown in FIG. 2, as shown in FIG. 2, due to the influence of the series capacitor, it enters the operation zone of the 01 element similarly to the accident point F1.

At this time, the accident at point F2 is eliminated by operating the differential relays 16b and 16c installed at both ends of the series capacitor. Distance relay 1 installed at terminal A
To prevent unnecessary operation of 6a, on-delay timer 1
The set value T1 of 1 is T1> differential relay 16b operating time (about 2∞) + (accident elimination time (about 2∞) (B not shown)
CB operation time of terminal) + Distance relay recovery time (about 1∞)
It is necessary to set + margin (about 1∞), for example, about 6∞. This means that the same timer is set in the case of the F1 point accident of the distance relay first stage section accident, and the first stage accident elimination time is also delayed, which causes a problem in system operation.

[0007]

In the conventional technique described above, the trip command by the 01 element for protecting the own section is added with the time by the cooperative timer waiting for the elimination of the accident in the adjacent section, and the trip command is delayed. There was a problem. An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional technique and to provide a distance relay device capable of protecting its own section in as short a time as possible.

[0008]

A distance relay device according to claim 1 of the present invention inputs a voltage and a current of a transmission line system, calculates a distance, judges an accident section, and responds to the accident section. In a distance relay device that outputs a cutoff command, when the circuit that detects an accident in the section that has a series capacitor operates, the circuit that detects the accident in the section that has the series capacitor operates by locking the own section protection circuit. If not, a logic circuit that allows the output of the own section protection circuit is provided. A distance relay device according to a second aspect of the present invention is the first aspect.
In the above, the position where the self-section protection lock is applied is set to the front stage of the on-delay timer connected to the first stage element.

[0009]

In the distance relay device of the first aspect, when an accident occurs in the section having the series capacitor, the own section protection is locked by the output of the circuit which detects the accident in the section.
Further, in the second aspect, the lock is applied in the preceding stage of the on-delay timer. Therefore, in the event of a circuit having a series capacitor, there is no malfunction in its own section, and quick protection operation is possible in the case of an accident in its own section.

[0010]

Embodiments will be described below with reference to the drawings. Figure 1
FIG. 3 is a configuration diagram of an embodiment of a distance relay device according to the present invention, and corresponds to claim 1. In FIG. 1, the same parts as those in FIG. In FIG. 1, 1 is a circuit (differential protection relay) that becomes a logical output “1” in the event of a fault having a series capacitor, 2 is a transmitting circuit, 3 is a receiving circuit, 4 is a NOT circuit, and 5 is an AND circuit. . Other configurations are the same as those in FIG.

The operation will now be described. Now, when an accident occurs in a section having a series capacitor, the circuit (differential protection relay) 1 has an output "1". This output is given to the AND circuit 5 via the transmitting circuit 2, the receiving circuit 3 and the NOT circuit 4, and locks the output of the 01 element 6. As a result, the settling time T1 of the on-delay timer 11 becomes T1.
> The differential protection relay operating time + transmission time can be shortened to settling.

According to the above-mentioned embodiment, whether the short circuit or the ground fault is specified is not specified, but the same applies to the short circuit relay and the ground fault relay. Further, in the embodiment corresponding to claim 1, the lock is applied in the latter stage of the on-delay timer 11, but the invention is not limited to this. In claim 2, the lock is applied in the front stage of the timer. Is. Also in this embodiment, the same effect as that of the first aspect can be obtained.

[0013]

As described above, according to the present invention, the trip command for protecting the own section of the distance relay device applied to the section adjacent to the system having the series capacitor can be speeded up to improve the system operation. A distance relay device that can improve reliability can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a distance relay device showing an embodiment of the present invention.

FIG. 2 is a system diagram having a series capacitor and a diagram showing installation of a protection relay.

FIG. 3 is a characteristic diagram of a distance relay.

FIG. 4 is a sequence block diagram.

[Explanation of symbols]

 1 differential protection relay 2 transmission circuit 3 reception circuit 4 NOT circuit 5, 9, 10 AND circuit 6 1st stage element 7 2nd stage element 8 direction element 11, 12, 13 on-delay timer 14 OR circuit

Claims (2)

[Claims] 1. A distance relay device, which inputs voltage and current of a transmission line system, performs distance calculation, and outputs a cutoff command according to sections of the first stage, second stage, and third stage, is adjacent to the distance relay device. A differential protection device installed at both ends of a series capacitor of a transmission line system, and in the distance relay device, a circuit for locking the first stage protection by an output of the differential protection device is provided. A characteristic distance relay device. 2. The distance relay device according to claim 1, wherein the locking of the first stage protection is performed before the on-delay timer inserted in the first stage element.