JPH0739089A - Switch member station testing apparatus - Google Patents

Abstract

PURPOSE:To eliminate test errors during a polling communication by a method wherein the generation of a polling signal in a communication line is detected and the existence of the polling communication is notified in accordance with the detected result. CONSTITUTION:It is detected by a polling signal detecting part 19 whether a switch member station which is a test object is receiving a polling signal or not. In accordance with the detected result of the detecting part 19, if a polling communication, wherein the switch member station is receiving the polling signal, exists, a notifying part 20 notifies the existence of the polling communication. Therefore, a test operator can identify whether the switch member station is in the polling communication or not by the existence of this notice. With this constitution, test errors during the polling communication can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch slave station test device for testing the condition of a switch slave station attached to a distribution switch of a distribution system.

[0002]

2. Description of the Related Art Conventionally, in a distribution system, for example, as shown in FIG. 3, a switch substation 3 is attached to each of the division switches 2 of each bank that divides the system 1, and the substation 3 is provided in its own bank. It has a control function of the switch 2 and a polling communication function of a distribution line conveying system with the master station 4 upstream of the system. In FIG. 3, the parent station 4 is provided at, for example, a business office of an electric power company, and is connected to each switch child station 3 via a substation child station 5 and a system 1 provided in the substation.

Each switch slave station 3 has A, B, and
Of the three phases of C, for example, the power source between the A and C phases is the upstream side (power source side) and the downstream side (load side) of the division switch 2 of the local bank.
Power is supplied via the transformers 6 and 7. A1, A2 in the figure
Is the A-phase power receiving terminal, C1 and C2 are the C-phase power receiving terminals, N
Reference numerals 1 and N2 denote neutral point terminals.

At the time of power failure or power recovery of the system 1, the switch slave station 3 monitors the occurrence and disappearance of the system voltage at the upstream and downstream of the partition switch 2 of its own bank, based on the monitoring of the occurrence. ON / OFF of the container 2 is controlled. Further, the polling signal for calling the slave station transmitted from the master station 4 is injected into the system 1 via the substation slave station 5, and is received by each switch slave station 3 by also using the power feeding path as a communication path.

Then, when each switch slave station 3 detects the call of its own station by the polling signal, it controls the switching of the division switch 2 based on the signal and returns information. In the case of calling another station, the polling signal is sent to the downstream side without making a reply.

Next, when testing (inspecting) the state of each switch slave station 3, as shown in FIG. 3, the switch slave station testing device 8 is connected to the switch slave station 3 to be inspected. The test apparatus 8 includes a simulated switch 9, a power supply unit 10, an injection unit 11 for sending and receiving, and a receiving unit 12.

The simulated switch 8 is connected to the switch slave station 3 by a connector, and operates under the control of the slave station 3 in place of the sectional switch 2 during the test. Further, the power supply unit 10 is supplied with power by an upstream system power supply between the power receiving terminals A1 and N1 or a downstream system power supply between the power receiving terminals A2 and N2 by switching the switch 13, and each part of the test apparatus 8 is based on this power supply. Drive power is supplied to.

Further, the injection unit 11 and the reception unit 12 open and close the switches 14 to 17 to receive the power receiving terminals A1, C1 or A.
2 and C2, the switch slave station 3 is selectively connected to a power supply path that is also used as a communication path for polling communication. And
By the manual or automatic test operation, the injection unit 11 can be
When various test signals set at 0 bps and 270 ± 10 Hz are transmitted, the signals are received by the slave station 3 via the communication path of polling communication of the switch slave station 3.

On the basis of this reception, the switch slave station 3 executes a specified test such as opening / closing of the simulated switch 9, and
Information of the result of this execution, for example, 30 bps, 450 ±
It is returned to the test apparatus 8 as a response signal set to 15 Hz. When this reply is received by the receiving unit 12 of the test apparatus 8, the test apparatus 8 displays the test result based on the received information.

[0010]

In the case of the conventional switchgear slave station testing device, the exchange of information (signal) between this device and the switchgear slave station uses the communication path of polling communication of the switch slave station. Is done. Moreover, the test signal transmitted from the test apparatus to the switch slave station is set to the same frequency as the polling signal used for calling the switch slave station polling communication.

Since the power of the polling signal is sufficiently larger than that of the test signal, the master station transmits the polling signal to call the switch slave station, and the polling signal and the test signal are tested by the test device during the polling communication. When and occur at the same time, the switch slave station cannot recognize the reception of the test signal and executes only the processing for the polling signal.

As a result, the switch slave station transmits a polling response signal or no response, and does not transmit a return response signal to the test signal. At this time, the test device does not display the test result, and there is a problem that the test operator erroneously determines that the switch slave station is abnormal. It is an object of the present invention to prevent the occurrence of a test error by notifying that the switch slave station is in polling communication.

[0013]

In order to achieve the above object, in the switch slave station test apparatus of the present invention, the presence of a polling signal in the communication path of the switch slave station polling communication,
A polling signal detection unit that monitors the absence and detects the generation of the polling signal, and a notification unit that operates according to the detection result of this detection unit and notifies that polling communication is in progress.

[0014]

In the switch slave station testing apparatus of the present invention having the above-described structure, the polling signal detector detects whether the switch slave station is receiving the polling signal.

Then, during the polling communication in which the switch slave station receives the polling signal based on the detection result of the detecting section, the notifying section notifies the generation of the polling signal.

By the presence / absence of this notification, the test operator can identify whether or not the switch slave station is in polling communication, and can prevent a test error during polling communication.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In FIG. 1, the same reference numerals as those in FIG. 3 denote the same elements, and 18 is a switch slave station test device corresponding to the test device 8 of FIG. 3, and the test device 8 is informed of the polling signal detection unit 19 and the lamp configuration. It is formed by adding the portion 20.

The detector 19 is the switch slave station 3 shown in FIG.
Power receiving terminals A1, C1, A2, C2 and switches 14 to 1
Switch 2 which is opened when a test signal is transmitted between
1 and 22 and is formed by providing a bandpass filter 23 and a processing circuit 24 as shown in FIG.

Therefore, when the test apparatus 18 is provided at the position of the test apparatus 8 in FIG. 3 for testing, when a polling signal is transmitted from the master station 4 to the system 1, this signal is transmitted to the switch slave station 3 to be tested. At the same time when received by the test device 1
8 is received by the detection unit 19. That is, the detection unit 19 is connected via the normally closed switches 21 and 22 to the power supply path that is also used as the communication path of the polling communication of the switch slave station 3, and except when the test device 18 transmits the test signal. Capture the signal on the communication path.

When the polling signal is extracted by the frequency separation of the filter 23, this signal is processed by the processing circuit 24.
Sent to. The processing circuit 24 converts the input signal into a digital signal by an A / D converter, processes the signal by, for example, a microcomputer to determine whether it is a polling signal, and determines whether or not the polling signal is present in the communication path. Monitor.

When the generation (reception) of the polling signal is detected, a lighting drive signal is formed as a detection result signal, and this signal is supplied to the notification unit 20. By this supply, the notification unit 20 is turned on to notify the generation of the polling signal, that is, the polling communication is in progress.

Therefore, it is possible to know whether or not the switch slave station 3 to be tested is in polling communication from the turning on and off of the notification unit 20, and the test operator does not perform the test during polling communication. You can prevent mistakes. When transmitting the test signal from the injection unit 11, the switches 21 and 22 are opened to prevent erroneous display due to this signal.

In the above embodiment, the case where the notification unit 20 has a lamp configuration has been described. However, the notification unit 20 may be configured by a buzzer, a bell, etc., and is formed by various visual and auditory notification means. Of course, you can do that.

[0024]

Since the present invention is configured as described above, it has the following effects. During polling communication in which the switch slave station 2 receives the polling signal based on the detection result of the detector 19, the polling signal detector 19 detects whether or not the switch slave station 2 receives the polling signal. Since the notification unit 20 notifies that polling communication is in progress, the presence or absence of this notification enables the test operator to identify whether or not the switch slave station is in polling communication, and to avoid a test error during polling communication. Can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a switch child station test device of the present invention.

2 is a detailed block diagram of a portion of FIG. 1. FIG.

FIG. 3 is a block diagram of a power distribution system to which the present invention is applied.

[Explanation of symbols]

 1 distribution system 2 division switch 3 switch slave station 8,18 switch slave station test device 19 polling signal detection unit 20 notification unit

Claims (1)

[Claims] 1. A switch attached to a distribution switch of a distribution system and having a control function of the switch and a communication function of polling communication of a distribution line carrier system with a master station. A switch slave station that is connected and exchanges a signal with the slave station via the communication path of the polling communication, and tests the state of the slave station by a response from the slave station based on a test signal transmitted to the slave station. In the test apparatus, a polling signal detection unit that monitors the presence or absence of the polling signal on the communication path and detects the occurrence of the polling signal, and an annunciation unit that operates according to the detection result of the detection unit and notifies that polling communication is in progress A switch station slave station test device comprising: