JPH07244109A - Fault point location starting method in time of multiple faults - Google Patents

Abstract

PURPOSE:To improve a specifying accuracy under substantially the same location calculating conditions by operating other fault detecting relay substantially simultaneously when multiple faults occur at a transmission line and one fault detecting relay is operated. CONSTITUTION:Fault detecting relays are respectively connected to transmission lines. When multiple faults occur and any one fault detecting relay is operated, a fault point location calculation of the corresponding line is stared, Simultaneously, a current to the other fault detecting relay is inverted, an operation of the other relay is decided, and a fault point location of the other line is started. Thus, starting times of the fault point location calculations of the multiple faults are set to the same, thereby improving the accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault point locating method, and more particularly to a method for activating a fault point locating operation when multiple faults occur in parallel two-line transmission lines.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory diagram for explaining a conventional example of this type. That is, fault detection relays 1LRy and 2LRy capable of discriminating inside and outside of an accident such as a distance relay or a direction relay are provided on the own line 1L and the adjacent line 2L, respectively, and a fault (multiple fault) occurs at both F1 and F2 points, for example. When it occurs, initially relay 1 as shown in Fig. 2 (a), for example
LRy operates, which activates the fault location calculation.

At this time, the relay 2LRy cannot operate because the direction of current flow is opposite. When the relay 1LRy operates, the circuit breaker (circuit breaker) CB of the 1L line trips, and the direction of the current of the 2L line changes as shown in FIG. As a result, the relay 2LRy operates, tripping the circuit breaker CB of the 2L line as shown in FIG. 2C and ending a series of operations.

[0004]

As described above, conventionally, one of the fault point locating operations is performed first, and the other of the fault point locating operations is activated with a delay, and the locating operation is not performed because the conditions are not the same. There may be a problem that the accuracy is lowered. Therefore, an object of the present invention is to stabilize the accuracy by enabling the activation of the fault point locating operation almost at the same time.

[0005]

In order to solve such a problem, in the present invention, a failure detection relay is connected to each of parallel two-line power transmission lines, and one of the failure detection relays operates when multiple failures occur. If this occurs, at the same time that the fault location calculation of the relevant line is started, the current to the other fault detection relay is inverted to determine the operation of the other fault detection relay and activate the fault location of the other line. It has a feature.

[0006]

[Operation] When multiple failures occur in the parallel two-circuit transmission line and one of the failure detection relays operates and the orientation starts, the current input condition of the other failure detection relay is changed to immediately determine the operation. Thus, the activation times of the fault point location calculation are made the same, and the accuracy thereof is improved.

[0007]

1 is a flow chart for explaining an embodiment of the present invention. First, in step S1, it is determined whether or not multiple failures have occurred. When multiple failures have occurred (YES), distance calculation is performed by the relay 1LRy, for example, in step S2, and relay 1LRy is calculated in step S3.
To determine if it worked.

As a result, if YES, the process proceeds to step S4, where the fault point locating calculation on the 1L side is started. next,
In step S5, the current on the 2L side is reversed to relay 2LRy.
Distance calculation is performed according to (step S6), step S
It is judged whether or not the relay 2LRy has operated at 7, and NO
If so, the process ends, while if YES, step S8.
Starts the fault point location calculation on the 2L side.

If NO in step S3, the process proceeds to step S9, in which the current on the 1L side is inverted and the relay 1
Distance calculation is performed using LRy (step S10), and it is determined in step S11 whether the relay 1LRy has operated. If the result is NO, the process proceeds to step S12, and if YES, the process proceeds to step S12 to activate the fault location calculation on the 1L side, and then the process proceeds to step S6.

In this way, when one of the failure detection relays operates due to multiple failures, the failure point localization calculation of the corresponding line is started, and at the same time, the other failure detection relay is also operated to locate the failure points of the other line. By starting the above, it is possible to prevent the accuracy of the fault location calculation from being lowered.

[0011]

According to the present invention, when multiple faults occur in a parallel two-line transmission line and one of the fault detection relays operates, the other fault detection relay operates at the same time as the other fault detection relay. The conditions for the point orientation calculation are almost the same, and there is an advantage that the accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a conventional example.

[Explanation of symbols]

1LRy, 2LRy ... Distance relay (fault detection relay), CB ... Circuit breaker (circuit breaker), F1, F
2 ... Failure point.

Claims (1)

[Claims] 1. A fault detection relay is connected to each of the parallel two-line transmission lines, and when one of the fault detection relays operates when multiple faults occur, at the same time when the fault point locating calculation of the corresponding line is started, A method for locating a fault point in the case of multiple faults, which comprises inverting the current to the other fault detection relay to determine the operation of the other fault detection relay and activating the fault point localization of another line.