CN212726476U

CN212726476U - Novel circuit test control circuit

Info

Publication number: CN212726476U
Application number: CN202021489777.6U
Authority: CN
Inventors: 胡清源; 伊晟; 唐凯; 仇敏; 沈晓燕
Original assignee: Shanghai Togee Metro Equipment Co ltd
Current assignee: Sichuan Tuoji Rail Transit Equipment Co ltd
Priority date: 2020-07-25
Filing date: 2020-07-25
Publication date: 2021-03-16
Anticipated expiration: 2030-07-25

Abstract

The utility model provides a novel circuit test control loop, which comprises a test loop, a feedback loop, a control loop and a protection device, the feedback loop comprises a delay relay contact, a common relay and a delay relay, one end of the delay relay contact is connected with the switching-on output of a test contactor of the protection device after being connected with the common relay in series, the other end of the delay relay contact is connected with a power supply, the delay relay is connected with a delay relay switch after being connected with the common relay in parallel, the switching-on output of another test contactor of the protection device is connected with the power supply, the control loop comprises a main control relay and a common relay contact, the main control relay is connected with the common relay contact in series and then connected with the power supply, the closing time of the delay relay is longer than the switching-on time of the circuit test contactor. The effects of reverse detection protection performance, automatic disconnection of the line detection circuit and improvement of safety performance can be achieved.

Description

Novel circuit test control circuit

Technical Field

The utility model relates to a track traffic direct current draws and uses cubical switchboard especially relates to a novel circuit test control circuit.

Background

With the vigorous construction of urban rail transit in China, subway rail transit becomes an important component of urban traffic. Because subway rail transit facilities are generally laid and built underground in cities, the quality requirements on subway related equipment are higher and higher.

The circuit testing loop arranged in the feeder cabinet occupied by the switch cabinet for the direct current traction has the functions of detecting whether a power supply main loop has a fault or not and is an important detection loop for the switch cabinet for the direct current traction, and the circuit testing loop is used for performing circuit testing before and during automatic reclosing of a breaker of the feeder cabinet every time, so that the circuit testing loop is a very important existence.

The existing circuit testing circuit has an electrical scheme that the switching-on function of a circuit testing contactor is directly controlled by a protection device, and when a special fault occurs in the protection device, if the signal is always output, the situation of reverse power transmission to a contact network can be caused by a circuit testing circuit when an operator maintains the circuit testing contactor. Further causing the electric shock of the workers contacting the net side and affecting the personal safety. The optimized circuit can avoid the condition that the one-time feed-out end is electrified due to accidental switching-on or contact adhesion of a contactor in the line detection loop, effectively prevents electrified accidents, and better guarantees personal safety.

The prior art solutions have essentially involved the direct attachment of the protective device to the coil of K03, which is completely dependent on the stability of the protective device. When the protection device is out of order, none of the functions of the reverse detection protection device and the automatic disconnection of the line detection circuit in the event of a failure.

The line detection loop main loop is directly connected with the main loop, and has a voltage of DC1500V, so that the power transmission to the contact network is caused, and the abnormity of the line detection loop not only has great influence on the protection function, but also has great influence on maintenance personnel, and is a great safety problem.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned not enough that present track traffic direct current traction exists with the cubical switchboard, the utility model provides a novel circuit test control circuit can reach the effect that has reverse detection protective properties, automatic disconnection line and examines the return circuit and improve the security performance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a novel circuit test control circuit, novel circuit test control circuit includes test circuit, feedback circuit, control circuit and protection device, feedback circuit includes delay relay contact, ordinary relay and delay relay, one termination is on protection device's a test contactor combined floodgate output after delay relay contact establishes ties with ordinary relay, the other termination is on the power, delay relay is parallelly connected with ordinary relay with the delay relay switch after establishing ties, another test contactor combined floodgate output of protection device connects on the power, control circuit includes main control relay and ordinary relay contact, main control relay connects on the power with ordinary relay contact series connection back, delay relay on-off time is greater than 1s, main control relay control test circuit is closed.

According to an aspect of the utility model, the test circuit includes fuse, the first contact of main control relay, the circuit that awaits measuring and the main control relay second contact of establishing ties in proper order.

According to the utility model discloses an aspect, novel circuit test control circuit still includes the warning return circuit, the warning return circuit is including the main control relay third contact and the alarm of establishing ties in proper order.

According to the utility model discloses an aspect, the external 1500V power of test loop, the external 24V power of feedback loop, the external 220V power of control loop.

According to an aspect of the invention, the coil closing time of the time delay relay is 4 s.

According to one aspect of the invention, at least two common relay contacts are provided on the control loop.

The utility model discloses the advantage of implementing:

the utility model provides a novel circuit test control loop, which comprises a test loop, a feedback loop, a control loop and a protection device, the feedback loop comprises a delay relay contact, a common relay and a delay relay, one end of the delay relay contact is connected with the switching-on output of a test contactor of the protection device after being connected with the common relay in series, the other end of the delay relay contact is connected with a power supply, the delay relay and the delay relay switch after series connection are connected in parallel with a common relay, the switching-on output of the other test contactor of the protection device is connected on a power supply, the control circuit comprises a main control relay and a common relay contact, the main control relay and the common relay contact are connected in series and then are connected on a power supply, the closing time of the delay relay is more than 1s, and the main control relay controls the test loop to be closed. The effects of reverse detection protection performance, automatic disconnection of the line detection circuit and improvement of safety performance can be achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an electrical schematic diagram of a novel circuit test control loop test circuit according to the present invention;

fig. 2 is an electrical schematic diagram of a feedback loop of a novel circuit test control loop according to the present invention;

fig. 3 is an electrical schematic diagram of a control loop of the novel circuit test control loop of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, 2 and 3, a novel line test control loop comprises a test loop, a feedback loop, a control loop and a protection device, wherein the feedback loop comprises delay relay contacts K1S-15,16, a normal relay K03 and a delay relay K1S, the delay relay contacts K1S-15,16 are connected in series with a normal relay K03 and then connected with a test contactor closing output of the protection device at one end and connected with a power supply at the other end, the delay relay K1S is connected in parallel with a delay relay K1S switch and a normal relay K03, the other test contactor closing output of the protection device is connected with the power supply, the control loop comprises a main control relay C10 and normal relay contacts K03-11,14 or K03-24,21, the main control relay C10 is connected with a normal relay contact K03-11,14 or K03-24,21 are connected in series and then connected on a power supply, the closing time of the delay relay K1S is longer than the closing time of the line test contactor, and the main control relay C10 controls the test loop to be closed.

In this embodiment, the test loop includes a fuse, a first contact C10-1 of the main control relay, a circuit to be tested, and a second contact C10-2 of the main control relay, which are connected in series in sequence.

In this embodiment, the novel circuit test control circuit further comprises an alarm circuit, and the alarm circuit comprises a third contact of the main control relay C10 and an alarm, which are connected in series in sequence.

In this embodiment, the test loop is externally connected to a 1500V power supply, the feedback loop is externally connected to a 24V power supply, and the control loop is externally connected to a 220V power supply.

In this embodiment, the coil closing time of the delay relay K1S is 4 s.

In the present embodiment, at least two normal relay contacts K03-11,14 or K03-24,21 are provided on the control circuit.

The utility model discloses a theory of operation:

the protection device controls an output port (test contactor closing output) A1: 68, A1: 69, causing its node to close. At this time, the K03 relay coil and the K1S time relay coil are electrified.

Under normal conditions;

a1: 68, A1: 69, the closing time of the node is 1.5-2 s, and the K03 common relay and the K1S time delay relay coil are electrified for 1.5-2 s. The node of the K1S time delay relay does not act and the normally closed

nodes

15,16 of K1S are still closed. The normally

open nodes

11 and 14 and the normally

open nodes

21 and 24 of the K03 are closed for 1.5-2 s, so that the coil of the C10 contactor is electrified for 1.5-2 s, and the normally

open contacts

1 and 2 and the normally

open contacts

3 and 4 of the C10 contactor are closed for 1.5-2 s. Thus the main electrical loop of the line test is activated.

In the abnormal condition:

when A1: 68, A1: 69, when the node closing time exceeds 4S, K1S gets charged for more than 4S. And the normally closed

nodes

15,16 of K1S become open. This causes the coil of K03 to be de-energized and the normally

open nodes

11 and 14 and 21 and 24 of K03 to be opened, so that the coil of the C10 contactor is de-energized and the normally

open contacts

1 and 2 and 3 and 4 of the C10 contactor are open. The main electrical circuit of the line test is thus stopped.

The utility model discloses the advantage of implementing:

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A novel circuit test control loop is characterized in that: novel circuit test control circuit includes test circuit, feedback circuit, control circuit and protection device, feedback circuit includes delay relay contact, ordinary relay and delay relay, one termination is on protection device's a test contactor combined floodgate output after delay relay contact establishes ties with ordinary relay, the other termination is on the power, delay relay and the delay relay switch after establishing ties are parallelly connected with ordinary relay, another test contactor combined floodgate output of protection device connects on the power, control circuit includes main control relay and ordinary relay contact, main control relay establishes ties with ordinary relay contact and connects on the power, delay relay on-off time is greater than 1s, main control relay control test circuit is closed.

2. The novel circuit test control loop of claim 1, wherein: the test circuit comprises a fuse, a first contact of the master control relay, a circuit to be tested and a second contact of the master control relay which are sequentially connected in series.

3. The novel circuit test control loop of claim 2, wherein: the novel circuit test control circuit further comprises an alarm circuit, and the alarm circuit comprises a third contact of the main control relay and an alarm which are sequentially connected in series.

4. A novel line test control loop as claimed in claim 3, wherein: the external 1500V power of test loop, the external 24V power of feedback loop, the external 220V power of control loop.

5. The novel circuit test control loop of claim 4, wherein: and the coil closing time of the time delay relay is 4 s.

6. The novel circuit test control loop of claim 5, wherein: and at least two common relay contacts are arranged on the control loop.