JPH0854415A - Connector for inspection of protective relay - Google Patents

Abstract

PURPOSE:To provide a connector of protective relay, which facilitates connection of a test apparatus. CONSTITUTION:The connector 2 is composed of a base stand 4 and of an insertion part 6 which is inserted into the base stand 4, and a plurality of pairs of connecting pieces which are normally in contact are installed at the base stand 4. The connecting pieces bring the primary side into electric continuity with the secondary side, and a power supply, output wires, control wires and the like are connected to a protective relay which is installed on the secondary side. When the insertion part 6 is inserted between the connecting pieces, it cuts off the primary side from the secondary side, and metal pieces 11, 13 on the secondary side come into contact with the respective wires for the protective relay so as to be connected to an inspection apparatus or the like. In addition, metal pieces 11, 13 which correspond to CT (instrument AC device) wires and contacts on the primary side are installed at the insertion part 6 so as to short- circuit the wires. Thereby, the connector can be connected easily to the inspection apparatus, a high voltage is not generated across terminals for the CT wires, the contacts are short-circuited, and a malfunction is not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector capable of easily connecting an inspection device to a protection relay.

[0002]

2. Description of the Related Art Protective relays cut off an electric current when an abnormal current or the like flows, and many kinds of protective relays are used to prevent a disaster from occurring. Such protection relays, especially those dealing with the protection of critical power equipment,
It is obliged to regularly inspect whether or not it operates normally in the event of an abnormality. The inspection covers many items such as overcurrent, overvoltage, undervoltage, overfrequency, and underfrequency.

Therefore, when inspecting the protection relay, the protection relay is removed and installed in an inspection machine for inspection, or when the protection relay cannot be easily removed, the connection wire connected to the protection relay is connected. , It was removed from the screw stop and each wire of the inspection equipment was connected to this screw stop for inspection.

[0004]

As described above, conventionally, the protection relay must be inspected by removing the protection relay or disconnecting each connection line connected to the protection relay, which is troublesome and time-consuming. However, there is a problem that the device connected to the protection relay cannot be used during the removal.

Further, a plurality of control lines are connected to the protection relay, and when they are opened like a CT (current transformer for instrument) line, the voltage between terminals sharply rises, and an ammeter, etc. Some may damage other equipment.

Further, when the output terminal of the protection relay is a b-contact, if the primary side and the secondary side are simply cut off, the protection relay is activated and the main power supply is cut off.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a connector for a protection relay which can be easily connected to an inspection device and can be inspected for a protection relay while power is being supplied to a device being supplied power. .

[0008]

According to the present invention, in order to solve the above problems, a connector used for a protection relay is constructed as follows. That is, it is composed of a base and an insertion part inserted into the base, and the base has an elastic force on at least one of the primary side of the power supply and the secondary side of the protection relay, which are correspondingly connected to each other. The insertion part has a plate part that is inserted into the base to separate and cut off the connection part of the base into a primary side and a secondary side, and the plate part of the protection relay side is provided on this plate part. If the output terminal of the protection relay is a b-contact and the first metal piece is provided with a metal piece that is connected to each connection piece and conducts to the outside, and the CT wire is short-circuited to the primary side, the connection piece of the base is cut off. And a second metal piece that short-circuits this output terminal before the protective relay is inspected.

[0009]

In normal use, the connecting pieces of the base are brought into contact with each other by their elastic force, connecting the primary side and the secondary side to electrically connect the protective relay and each wire on the primary side. Therefore, when an excessive current to be protected flows, the protection relay operates and trips the circuit breaker. On the other hand, when inspecting the protection relay, by inserting the insertion portion into the base, each metal piece of the insertion portion can be connected to the protection relay and connected to the inspection machine. Further, on the primary side, when the protection relay is the b contact, the output line is short-circuited before the conduction is interrupted, so that the relay operation is not erroneously recognized, and the CT line is short-circuited. No high voltage is generated between the wire terminals, and the equipment can be used continuously even while the protection relay is being inspected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a protective relay inspection connector of the present invention will be described with reference to the drawings.

FIG. 1 shows the entire connector 2. The connector 2 includes a base 4 and an insertion portion 6 that is inserted into the base 4, and is integrally provided with a protection relay 8 as shown in FIG.

First, the installation state of the protection relay 8 will be described with reference to FIG. As an example, the circuit breaker 14 is provided from the power supply unit 10 through the disconnector 12, and the circuit breaker 14 is provided with the first protection relay 8. Then, the second breaker 14 and the second protection relay 8 are installed via the transformer 16. After that, it is distributed to each device, and the third circuit breaker 14 and the protection relay 8 are installed for each device. The protection relay according to the present invention may be any of the above examples.

The protective relay 8 has an output terminal b-contact, that is, a normally-closed contact, and has a control PT (measuring transformer).
Input line a such as a computer or CT, a relay output line b connected to the circuit breaker 14, and a power line c for operating the relay itself.
Is electrically connected to the protection relay 8 through the connector 2.
The output line b may be connected not only to the circuit breaker 14 but also to an alarm device or the like (not shown).

Next, the connector 2 will be described. The base 4 has a hollow center, and as shown in FIG.
A pair of connection pieces 3 including a and a connection piece 3b on the secondary side are provided in a direction perpendicular to the drawings. The connection piece 3 is made of metal and has elasticity, and the pair of connection pieces 3 are elastically in contact with each other to be electrically connected. As a result, the input line a, the output line b, or the power line c on the primary side is connected corresponding to each line of the protection relay 8 on the secondary side as shown in FIG.

As shown in FIG. 1, the insertion portion 6 is configured such that a plate portion 7 having a T-shaped side cross section and extending downward is inserted into the base 4. One of the both side surfaces of the plate portion 7 corresponds to the power line side and the other side corresponds to the protection relay side. Here, the power line side is the primary side and the protection relay 8 side is the secondary side. As shown in FIG. 3, an output terminal, that is, a metal piece 11 corresponding to the output line b is provided on the primary side of the plate portion 7 so as to extend to the tip of the insertion portion 6 and be connected to each other. . Further, at the position corresponding to the CT line, the metal piece 13 is provided in the state of being connected to each other as shown in FIG. Unlike the metal piece 11, the metal piece 13 does not reach the tip of the plate portion 7.

On the secondary side of the insertion portion 6, metal pieces (not shown) corresponding to the power source, the input line, the output line b, etc. of the protection relay 8 are provided, and the lead wire 19 is formed from each metal piece. It is extended and taken out from the upper part.

Therefore, the connecting piece 3 inside the base 4 is usually used.
Since they are in contact with each other, the primary side and the secondary side are energized as shown in FIG. 6, and, for example, when an excessive current flows, the protection relay 8 operates and sends a signal to the circuit breaker 14, and the power source unit 10 Cut off the power supply.

Next, the case where the inspection is performed will be described. When performing the inspection, as shown in FIG.
Insert into base 4. Then, the metal piece 11 first contacts the connection piece 3 of the output terminal, and then the primary side and the secondary side of the base 4 are separated, and then the metal piece 13 or the metal piece of the secondary side is the connection piece of the CT line. 3 and the respective connecting piece 3.
Such a state is shown in FIG. Therefore, the output line and the CT line are short-circuited by the metal pieces 11 and 13, a signal of malfunction of the protection relay 8 is not generated, and a high voltage is not generated between the terminals of the CT line. Moreover, since the metal piece 11 contacts the connection piece 3 of the output line before the primary side and the secondary side of the base 4 are separated, the output line b is not opened even for a moment.

Further, by inserting the insertion portion 6 into the base 4, each wire of the protection relay 8 and the metal piece on the secondary side of the insertion portion 6 are connected, so that the lead wire 19 and the inspection machine 20 are plugged. By connecting via etc. (not shown),
The protection relay 8 and the inspection machine 20 can be easily connected. Therefore, the inspection relay 20 can promptly inspect the protection relay 8 by sending various inspection signals such as overcurrent and overvoltage to the protection relay 8 and inspecting the reaction thereof.

Further, during the inspection, the protection relay 8 temporarily does not operate, but when it can be supplemented by another relay, the power supply to the equipment may be continued. Thereby, the inspection can be performed even when the factory is operating, and the inspection of the protection relay 8 can be efficiently performed.

In the present invention, one connector 2 can be provided with a plurality of protection relays 8. In that case, the input line a and the output line b can be made common. Further, although the connector 2 is integrated with the protection relay 8 in the present embodiment, the present invention is not limited to this and may be attached to a terminal block or the like separately from the protection relay 8.

[0022]

According to the protective relay connector of the present invention, the base is provided with the elastic connecting piece for connecting the primary side and the secondary side, and the insertion portion is connected to the secondary side protective relay. However, since it is equipped with a metal piece that leads to the outside, and the output terminal of the protection relay and the metal piece that short-circuits the CT line are formed on the primary side, if the insertion part is not inserted into the base, The connection pieces in the base can come into contact with each other and can function as a protection relay.When inspecting the protection relay, by inserting the insertion part into the base, the connection pieces of the base can be opened. , At the same time, the protection relay and the insertion part are connected and can be connected to the inspection device through the insertion part, and on the primary side, when the protection relay is the b contact, the output terminal is not interrupted first. Shorted Further because CT line is short-circuited, without erroneous signal flows to the output line, and the abnormal voltage between the terminals of the CT line does not occur.

Moreover, since the power is not cut off even during the inspection of the protection relay, the equipment can be continuously used during that time.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a connector according to the present invention.

FIG. 2 is a circuit diagram showing an entire structure including a protection relay.

FIG. 3 is a front view showing the insertion portion of the connector of the present invention.

FIG. 4 is a sectional view showing a base of the connector of the present invention.

FIG. 5 is a sectional view showing an example of use of a connector according to the present invention.

FIG. 6 is a diagram showing wiring of the connector in a state where the insertion portion is not inserted.

FIG. 7 is a diagram showing the wiring of the connector with the insertion portion inserted.

[Explanation of symbols] 2 connector 3 connection piece 4 base 6 insertion part 7 plate part 8 protection relay 9 connection piece 10 power supply 11 and 13 metal piece 12 disconnector 14 circuit breaker 16 transformer 19 lead wire 20 inspection machine a input wire b Output line c Power line

Claims (1)

[Claims] 1. A base of a protective relay connector having at least a CT line for control, comprising a plurality of elastic connecting pieces inside for electrically connecting a primary side and a secondary side.
By inserting between the connecting pieces, the electrical connection between the primary side and the secondary side of the base is cut off, and the connecting pieces provided on the secondary side of the base are contacted to bring each connecting piece to the outside. C of the primary side, which is equipped with a metal piece to be connected to the inspection machine of
When the output terminal of the protection relay is a b-contact and the b-contact on the primary side is in contact with the first metal piece that comes into contact with the T-line and short-circuits the CT line, there is conduction between the primary side and the secondary side of the base. A connector for inspecting a protective relay, comprising: a plug-in portion having a second metal piece that comes into contact before being cut off and short-circuits the b terminal.