JP2003045573A - Terminal plug for testing relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unnecessary operations for a relay which may be generated at plug insertion time. SOLUTION: A testing terminal 1 has first an second contacts 5 and 6. A plug 11 is provided with first and second conductive parts 13 and 14 different in the length. When inserting the plug 11 into the terminal 1, the longer conductive part 14 contacts with the first contact 6, and then the first conductive part 13 contacts with a contact piece 5. Since a conventional plug is of the same in the length of the first and second conductive parts, when inserting the plug, contact of the first and second conductive parts and the first and second contacts 5 and 6 is made simultaneous or either one contacts first. Since a short circuit line and a crossover are connected to the plug, a ratio operation relay may perform unnecessary operations, when using the plug 11 having the first and second conductive parts 13 and 14 different in the length, the relay will not perform unnecessary operation.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test terminal plug used for performing a differential ratio test in a protective relay characteristic test, for example. 2. Description of the Related Art In FIG. 4, a test terminal plug A is
It comprises a test terminal 1 and a plug 11 inserted into the terminal 1. The test terminal 1 includes a terminal plate 3 having terminal screw mounting portions 3a and 4a fixed to a base 2 made of an insulating material.
4, an insulating material having first and second contacts 5 and 6 attached to the terminal plates 3 and 4 and a plug insertion hole 9a covering the first and second contacts 5 and 6, respectively. And a cover 9. The first and second contacts 5 and 6
It comprises two contact pieces 5a and 5b and 6a and 6b each having an inverted J-shaped cross section and different lengths, and the base ends of the first and second contacts 5 and 6 are terminal plates 3 and 4, respectively. Are fixed by mounting screws 7 and 8 to form a two-blade contact. The first and second contacts 5, 6 are always in contact,
When the plug 11 is inserted between the first and second contacts 5, 6, the contact between the first and second contacts 5, 6 is released. The plug 11 includes a plug body 12 having an approximately T-shaped cross-section made of an insulating member having a handle portion 12a and an insertion portion 12b, and an insertion portion 1 of the plug body 12.
2b, and terminal portions 13 formed integrally with the conductive portions 13 and 14 and passing through the inside of the handle portion 12a and protruding to the back side of the handle portion 12a.
a and 14a. The test terminal 1 includes three (3P) or six contacts having a two-blade configuration including the first and second contacts 5 and 6.
(6P), and the plug 11 to be inserted into the test terminal 1 also has the same number of conductive portions 13 and 14. When the plug 11 is inserted into the test terminal 1, the contact between the contact pieces 5a, 6a and 5b, 6b of the first and second contacts 5, 6 is cut off by the insertion portion 12b, 5a and 5b are in contact with the conductive portion 13a of the plug 11, and the contact pieces 6a and 6b are in contact with the conductive portion 14 of the plug 11. Therefore, for example, as shown in FIG.
The test terminal 1 is connected between the CT and the protective relay Ry, and during the test, the terminal 13 of the conductive portion 13 of the plug 11 is connected.
a, a short-circuit line 15 is connected to the conductive portion 14 of the plug 11.
By inserting the plug 11 into the test terminal 1 with the connection line 16 of the tester TS connected to the terminal portion 14a of the
The disconnection of the secondary side and the protection relay Ry and the short-circuiting of the CT secondary side can be performed at the same time, and the testing device TS can be connected to the protection relay Ry without opening the CT secondary side. [0007] As equipment of a current substation, a double protective relay is provided to improve reliability. In addition, the number of tests in the daytime charged state is increasing due to the reduction of maintenance staff and the like. As shown in FIG. 5, in a circuit in which protective relays RyA and RyB are provided in a double manner, a test terminal 1 having six contacts having the above-mentioned two-blade configuration is provided before and after the relay.
a to 1d are connected to enable testing at any time. When testing the A-system protection relay RyA to be tested,
Plugs 11a and 11c are inserted into the test terminals 1a and 1c so that the current flowing through the protection relay RyA is bypassed and cut off from the current circuit so that the differential relay does not operate. When the plug 11c having the connecting wire 17 connected to the test terminal 1c is inserted, the transformer TR side currents I2r, I2s, I2t flowing through the protection relay RyA are changed to the plug 1c.
1c, the load currents I1r, I1s, I1t from CT1 flowing through the B-system protection relay RyB and the transformer T from CT2.
Since the R-side currents I2r, I2s, and I2t are balanced, the B-system ratio differential relay RyB does not operate. However, the plugs 11a and 11c are
7. Test terminals 1a, 1c with short-circuit line 18 connected
When the plug 11c is inserted, the short-circuit wire 18 of the plug 11c is connected before the conductive portion 14 of the plug contacts the second contact 6 to which the connecting wire 17 of the test terminal 1c is connected. The first contact 5 on the conductive portion 13
When the conductive portion 13 of the plug contacts the terminal 7, the terminals 7, 9, and 11 of the test terminal 1c are short-circuited and the currents I2r, I2s, and I2t may not flow to the B-system relay RyB, as shown in FIG. , B-system ratio differential relay RyB may operate unnecessarily. The present invention has been made in view of such problems, and has as its object to prevent unnecessary operation of a ratio differential relay or the like that occurs when a plug is inserted into a test terminal. A test terminal plug according to the present invention includes a test terminal having first and second contacts that are in opposing contact with each other, and is inserted into the test terminal. The first and second contacts separate the contact between the first and second contacts and contact the first contact; a second conductive portion that contacts the second contact; And a plug having first and second terminals connected to the second conductive portion, respectively. In the test terminal plug, the first and second conductive portions of the plug are different from each other in the tip position. And the first and second conductive portions are prevented from simultaneously contacting the first and second contacts of the test terminal when inserted into the test terminal. FIG. 1 shows a schematic sectional configuration of a test terminal plug according to an embodiment of the present invention. Referring to FIG.
The test terminal plug A includes a test terminal 1 and a plug 11. This test terminal plug A is a plug 11
4 except that the lengths of the conductive portions 13 and 14 of FIG.
The configuration is the same as that shown in FIG. That is, the test terminal 1 had a base 2, a terminal plate 3 having a terminal screw mounting portion 3 a attached to the base 2, and a terminal plate 4 having a terminal screw mounting portion 4 a, and an inverted J-shaped cross section. First and second contacts 5 and 6 comprising contact pieces 5a and 5b and 6a and 6b;
And a cover 9 having a plug insertion hole 9a.
The base ends of the first and second contacts 5 and 6 are fixed to the terminal fittings 3 and 4 with screws 7 and 8 so that they are always in contact with each other, thereby forming a two-blade contact. The plug 11 has a T-shaped cross section made of an insulating member having a handle portion 12a and an insertion portion 12b, and first plugs having different lengths provided on both surfaces of the insertion portion 12b. , A second conductive portion 13, 14, and a terminal 1 formed integrally with the conductive portion 13, 14 and protruding through the inside of the handle portion 12 a to the opposite insertion portion side of the handle portion 12 a.
3a and 14a. The first conductive portion 13 of the plug 11 is formed to be shorter than the second conductive portion 14 by a length a as shown in the figure, and the leading end of the first conductive portion 13 is located farther than the leading end of the second conductive portion 14. It is provided so as to be at a position retracted by the length a. That is, when the plug 11 is inserted into the test terminal 1, after the second conductive portion 14 comes into contact with the second contact 6 of the test terminal 1, the conductive portion 13 is delayed by the first contact 5. The test terminal 1 has three (3P) or six contacts having a two-blade configuration including the first and second contacts 5 and 6.
(6P), and the plug 11 is also provided with three (6P) or six (6P) conductive portions 13 and 14. As shown in FIG. 2, the plug 11 in which the length of the first conductive portion 13 is shorter than the length of the second conductive portion 14 is provided with two protective relays RyA and RyB. Consider a case where the present invention is applied to the test terminals 1a to 1d connected to the protection relays RyA and RyB, respectively. The test terminals 1a to 1d and the plugs 11a to 11d are paired with the first and second contacts 5, 6 and the paired first
1. The number of the second conductive portions 13 and 14 is 6 (6P). The test of the protection relay A for the A system test is performed by inserting the plugs 11a and 11c into the test terminals 1a and 1c, respectively. When the plug 11c is inserted into the test terminal 1c, the contact of the contact pieces 5a and 5b of the first contact 5 of the test terminal 1c is cut off at the tip of the plug 11c, and at the same time, the longer second conductive portion 14 is formed. Since the second contacts 6 are in contact with each other, the currents I2r, I2s,
Connecting wire 1 connected to the terminal portion 14a of the conductive portion 14 of FIG.
7 flows to the B-system protection relay B, bypassing the A-system protection relay A. Immediately after that, the first
3 contacts the first contact 5 and a short-circuit line 18 connected to the terminal portion 13a of the first conductive portion 13 in FIG.
As described above, the terminals 7, 9, 11 of the test terminal 1c are short-circuited. Therefore, as shown in FIG.
When the plug 11 is inserted into the terminal 7, the terminal 7 of the test terminal 1c,
9 and 11 are short-circuited by the short-circuit line 18 so that the currents I2r, I2s and I2t do not flow through the B-system protection relay, and the ratio operation relay of the B-system protection relay B does not malfunction. When the plug 11a is inserted into the test terminal 1a of the A-system protection relay A, the current I1 flowing therethrough is the same as when the plug 11c is inserted into the test terminal 1c.
The A-system protection relay A can be bypassed with a crossover without short-circuiting r, I1s, and I1t, and can flow to the B-system protection relay B. Therefore, as shown in FIG. 3, the A-system protection relay A can be disconnected from the current circuit without activating the ratio differential relay of the B-system protection relay B. As described above, the test terminal plug A of the present invention is provided such that the distal end of the first conductive portion 13 of the plug 11 is located at a position retracted from the distal end of the second conductive portion 14. The plug 11 is connected to the test terminal 1
Is inserted, the contact portions 6 and 5 of the test terminal 1 are always contacted in the order of the conductive portions 14 and 13, so that the conventional conductive portion 1
Like the plug 11 in which the tip positions of 3, 14 are aligned,
It is no longer possible to malfunction the ratio differential relay or the like. According to the present invention, since the tip positions of the first and second conductive portions of the plug are different, the test terminals of the first and second conductive portions of the plug when the plug is inserted. 1,
The order of the second contacts is defined and does not change depending on the insertion method. Therefore, a relay test or the like during pressurization in the daytime zone can be performed safely. Since only the length of the conductive portion of the plug is changed, it can be manufactured at the same cost as the conventional test terminal plug.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side sectional view of a test terminal and a plug according to an embodiment. FIG. 2 is a diagram illustrating a current when a protection relay to be tested according to the embodiment is bypassed. FIG. 3 is an explanatory diagram of a load current and a test current during the test. FIG. 4 is a schematic side sectional view of a test terminal and a plug according to a conventional example. FIG. 5 is a diagram illustrating a current in an operating state of a driving-side protection relay according to a conventional example. FIG. 6 is an explanatory view showing an example of use of a conventional test terminal plug. [Description of References] Ry ... Protective relay 1 ... Test terminal 5 ... First contact 6 ... Second contact 11 ... Plug 13 ... 1 conductive part 14 ... second conductive parts 13a, 14a ... terminals 15 to 18 ... crossover wire, short-circuit wire

Claims (1)

Claims: 1. A test terminal having first and second contacts in opposing contact with each other, and the first and second contacts when inserted into the test terminal. And a first conductive portion that contacts the first contact, a second conductive portion that contacts the second contact, and the first and second conductive portions, respectively. 1st, 2nd
And a plug having a first terminal and a second terminal when the plug is inserted into the test terminal. A test terminal plug, wherein the conductive portion of the test terminal does not contact the first and second contacts of the test terminal at the same time.