JPS61235762A - Testing circuit for distributing board - Google Patents

Abstract

PURPOSE:To easily confirm whether a protection relay and a circuit breaker are normal or not when a combinational test of the both is taken by making the output contact of the protection relay to energize an auxiliary relay and letting the relay hold itself on, and turning on a lamp through its make contact. CONSTITUTION:The output contact 1 of the protection relay, the coil 2 of the 1st auxiliary relay, and the auxiliary make contact 3 of the circuit breaker are connected in series. Then, a test switch 6 is closed to make its auxiliary contact 6a, thereby turning on the 1st lamp 9. Then when the contact 1 is closed, the coil 2 is excited to make its make contacts 2a1 and 2a2; and the contact 2a1 is made to generate a trip output at a trip output terminal 5 and trip the circuit breaker and the contact 2a2 is made to excite the coil 7 of the 2nd auxiliary relay and make its make contacts 7a1 and 7a2. The contact 7a1 is made to place the coil 7 in a self-holding state and the contact 7a2 is made to turn on the 2nd lamp 10, thereby indicating that the protection relay operates normally.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a test circuit for a power distribution board, for example, a test circuit for testing a combination of a protective relay board and a circuit breaker.
! The present invention relates to a test circuit.

[Conventional technology]

A conventional test circuit of this type is shown in FIG. In the figure, the output contact (1) of the protective relay, the coil (2) of the first auxiliary relay, and the auxiliary make contact (
3) is connected in series, for example, with a DC voltage of 110V.
is connected between the power supply lines (b) and (2) to which the voltage is applied. The make contact (2a1) is connected in series to the trip output terminal (5), and the coil (2a1) of the tiEl auxiliary relay is connected in series to the trip output terminal (5).
) is closed when energized, producing a trip output at the trip output terminal (5).

Next, the operation will be explained. When performing a test of 9 combinations of protective relay panel and circuit breaker, input the current transformer secondary current from the test terminal of the protective relay panel to operate the protective relay and close its output contact (1). make it happen Closing of the output contact (1) closes the coil (2) of the auxiliary relay @l.
) is energized and closes its make contact (2al) to produce a trip output at the trip output terminal (5), tripping the circuit breaker.

[Problem that the invention seeks to solve]

Conventional test circuits are configured as described above, and when the circuit breaker is tripped by operating the protective relay panel, it is difficult to determine whether the circuit breaker has tripped or not because the protective relay panel and the circuit breaker are far apart. I had to go and check each circuit breaker installation location. Also, when trying to confirm tripping of the circuit breaker in the protective relay panel, connect the control cable between the circuit breaker and the protective relay panel,
There is a problem in that a separate path must be provided to receive the signal from the auxiliary contact of the circuit breaker in the protective relay panel.

This invention was made to solve the above-mentioned problems. For example, in a protective relay panel, the protective relay and the circuit breaker can be easily connected without connecting a control cable between the circuit breaker and the protective relay panel. The purpose is to provide a test circuit for switchboards that can confirm the quality of the power distribution board.

[Means for solving problems]

The test circuit for the WL panel according to the present invention includes an auxiliary relay that is energized and self-maintained by closing the output contact of the protective relay, and a make contact of this auxiliary relay during a combination test of a protective relay and a circuit breaker. The lamps are connected in series.

[Effect]

The test circuit for a power distribution board according to the present invention, when testing the combination of a protective relay and a circuit breaker, excites the auxiliary relay to self-hold by closing the output contact of the protective relay, and lights a lamp with its make contact. , check the operation of protective relays and circuit breakers.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a test circuit for a power distribution board according to the present invention.
The coil (2) of the auxiliary relay and the auxiliary make contact (3) of the circuit breaker are connected in series to form a first series circuit (4). The make contact (2a,) of the first auxiliary relay is connected in series to the trip output terminal (5) to form a trip circuit (5AJ).The test switch (6) is closed during the test, The test switch (6), the make contact (2al) of the first auxiliary relay, and the coil (7) of the second auxiliary relay are connected in series, and the make contact (
A make contact (7a1) of a second auxiliary relay for self-holding is connected in parallel to 2a2) to form a second series circuit (8). Auxiliary contact (6a) of test switch (6)
) is linked to the test switch (6) and is connected in series to the first lamp (9), which is, for example, a green lamp. The second lamp αQ is, for example, a blue lamp, and is connected to the make contact (?a2) of the second auxiliary relay. The power line Qη, sub is, for example, DC voltage 11
0V is applied.

Next, the operation will be explained. At the start of the test, the test switch (6) is closed, its auxiliary contact (6a) is closed, and the first lamp (9) is lit to indicate that the test is in progress. Next, input the current transformer secondary current from the test terminal of the protective relay panel, and connect the protective relay output contact (2al) #
(2a2) is closed. Closing of the make contact (2a1) generates a trip output at the trip output terminal (5), tripping the circuit breaker, and closing the make contact (2a2) excites the second auxiliary relay coil (7). and its make contacts (7a1), (7a
z) is closed, the second lamp αQ is lit to indicate that the protection relay has operated normally.

In this case, whether the auxiliary make contact (3) of the circuit breaker is in the closed state or in the open state, the second lamp Q The operation of the device cannot be confirmed.

Therefore, in this state, the test switch (6) is once opened to de-energize the coil (7) of the second auxiliary relay, and then closed again. That is, if the circuit breaker is operating normally, its auxiliary make contact (3) is open, so the first auxiliary relay coil (2) is not excited.
Its make contact (2α2) does not close and the second auxiliary relay coil (7) is not energized. Therefore, the second lamp αQ
does not light up, confirming that the circuit breaker is operating normally.

On the other hand, if the circuit breaker is not operating normally, its auxiliary make contact (3) remains closed, so
The second lamp C1l lights up again in the same manner as in the above operation, confirming that the circuit breaker is not operating normally.

In the above embodiment, the auxiliary contact (6a) is provided separately from the test switch (6), but the test switch (6) and the auxiliary contact (6a) may be the same.

〔Effect of the invention〕

As described above, according to the present invention, by opening and re-closing the test switch, the lamp is turned on and off when the circuit breaker is cut off by the operation of the protective relay, and the capture relay and the circuit breaker are cut off. Since it can be confirmed that they are normal, it is possible to easily check whether the protective relay and circuit breaker are good or bad.

[Brief explanation of drawings]

FIG. 1 is an electrical wiring diagram showing an embodiment of a test circuit for a switchboard according to the present invention, and FIG. 2 is an electrical wiring diagram showing a conventional test circuit for a switchboard. In the figure, (1) is the output contact of the protective relay, (2) is the coil of the auxiliary relay @l, (2al) i2a2) is the make contact of the first auxiliary relay, and (3) is the auxiliary make contact of the circuit breaker. , (4) is the first series circuit, (5A) is the trip circuit, (6) is the test switch, (7) is the coil of the second auxiliary relay, (7al)e (7a2) is the second auxiliary relay make contact, (8) is @2 series circuit, (9)
, αQ is the first . This is the second lamp. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa, Patent Attorney 1st I! A 1: Output 4 of Ire wo Natsushi-, to 2: Fill 2aL of 1st Eisuke Sushi- 2a2: May 2 sacrificial, 3: Ne solution of up to 11/rR, Sukenoik Ichigo method , 4: 1st direct J-J [] road 5 5A: Tori 1 pro pseudo-shiro: Test λ iso + 7: 2nd J city ゛ 1 loop fill 7a 7a 2: Make waiting point S: #2 No. 11 Circuit 9.10:'! J1. Kaya 2 Funa Diagram 2 Procedural Amendment (Voluntary) l. Indication of the case Patent application 1977/2. Name of the invention Test circuit for switchboard 3. Relationship with the case of the person making the amendment Residence of the patent applicant Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Address: 2-2-3-6 Marunouchi, Chiyoda-ku, Tokyo Contents of the amendment (1) No. 7 on page 7 of the specification In line 18, "capture relay" should be corrected to "protection relay."

Claims (1)

[Claims] (1) A first series circuit in which the output contact of the protective relay, the coil of the first auxiliary relay, and the auxiliary make contact of the circuit breaker are connected in series, and is closed when the coil of the first auxiliary relay is energized. A trip circuit consisting of the make contact of the first auxiliary relay, a test switch, the make contact of the first auxiliary relay, and the coil of the second auxiliary relay are connected in series, and the trip circuit is configured for self-holding of the second auxiliary relay. A switchboard comprising: a second series circuit having a make contact connected in parallel to the make contact of the first auxiliary relay; and a lamp that lights up when the make contact of the second auxiliary relay is closed. test circuit.