CN215343483U

CN215343483U - Isolation switch cabinet

Info

Publication number: CN215343483U
Application number: CN202121732071.2U
Authority: CN
Inventors: 谢源; 阚劲松; 张永军; 仇敏; 祁冬伶; 郭洋
Original assignee: Shanghai Togee Metro Equipment Co ltd
Current assignee: Sichuan Tuoji Rail Transit Equipment Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-12-28
Anticipated expiration: 2031-07-28

Abstract

The utility model discloses an isolating switch cabinet, wherein an isolating circuit with one end connected with an isolated circuit and the other end connected with a power supply end is arranged in the isolating switch cabinet, an isolating switch is arranged on the isolating circuit, one end of the isolating switch is connected with the isolated circuit, and the other end of the isolating switch is selectively connected with or not connected with the power supply end and a grounding end; a pressure measuring circuit and a pressure relief circuit which are connected in parallel are arranged in the isolating switch cabinet; one end of the voltage measuring circuit is grounded, and the other end of the voltage measuring circuit is connected with the isolated circuit; and the pressure measuring circuit and the pressure relief circuit are both connected to a PLC control center. The isolating switch cabinet provided by the utility model can judge whether the contact net is electrified or not and can ground the contact net.

Description

Isolation switch cabinet

Technical Field

The utility model relates to rail transit traction power supply equipment, in particular to an isolating switch cabinet.

Background

In the rail transit traction substation, direct current is transmitted to a contact net or a contact rail by an on-line isolation switch cabinet, and the subway draws current on the contact net or the contact rail as a power source. What be equipped with in the isolator cabinet of present online is a single-pole isolator, and the function is single, cuts off feeder circuit breaker and contact net when being shut down and overhaul, has following problem and shortcoming:

the maintainer need be hung the earth bar on the spot and test the electricity by the maintainer earlier when overhauing the contact net, overhauls after confirming electroless, and the step is loaded down with trivial details, and it is long to overhaul preparation instrument many, consume time, and often takes place the accident that the maintainer does not walk according to the flow and electrocute.

When the earthing rod is hung in the maintenance, often the contact net has the residual voltage or faces the station and does not stop giving the contact net power supply, and unable safe effectual judgement this moment is residual voltage or contact net has the electricity, directly hangs the earthing rod and easily causes short circuit fault and electric shock accident.

SUMMERY OF THE UTILITY MODEL

In view of the above disadvantages, the present invention provides an isolation switch cabinet, which can determine whether a contact system is electrified or not and can ground the contact system.

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

an isolating switch cabinet is provided with an isolating circuit, one end of the isolating circuit is connected with an isolated circuit, the other end of the isolating circuit is connected with a power supply end, an isolating switch is arranged on the isolating circuit, one end of the isolating switch is connected with the isolated circuit, and the other end of the isolating switch is selectively connected with or not connected with the power supply end and a grounding end; a pressure measuring circuit and a pressure relief circuit which are connected in parallel are arranged in the isolating switch cabinet; one end of the voltage measuring circuit is grounded, and the other end of the voltage measuring circuit is connected with the isolated circuit; and the pressure measuring circuit and the pressure relief circuit are both connected to a PLC control center.

According to one aspect of the utility model, the pressure measuring circuit comprises two groups of mutually redundant pressure measuring loops, each pressure measuring loop comprises an isolation voltage transmitter, one end of the primary side of the isolation voltage transmitter is connected with the isolated circuit, and the other end of the primary side of the isolation voltage transmitter is grounded; and the secondary side of the isolation voltage transmitter is connected to a PLC control center.

According to one aspect of the utility model, the voltage relief circuit comprises a resistor, a contactor and a fuse which are connected in series, wherein the contactor is connected to a PLC control center.

According to one aspect of the utility model, the disconnector cabinet further comprises a locking mechanism for locking the disconnector.

According to one aspect of the utility model, a camera device is arranged in the isolating switch cabinet and is connected to the PLC control center.

The implementation of the utility model has the advantages that: because the isolating switch cabinet is internally provided with an isolating circuit with one end connected with the isolated circuit and the other end connected with the power supply end, the isolating circuit is provided with an isolating switch, one end of the isolating switch is connected with the isolated circuit, and the other end of the isolating switch is selected from the power supply end and the grounding end to be connected or not connected; a pressure measuring circuit and a pressure relief circuit which are connected in parallel are arranged in the isolating switch cabinet; one end of the voltage measuring circuit is grounded, and the other end of the voltage measuring circuit is connected with the isolated circuit; the voltage measuring circuit and the pressure relief circuit are connected to the PLC control center, so that the voltage of the isolated circuit can be tested through the voltage measuring circuit, the voltage of the isolated circuit is reduced through the pressure relief circuit to test whether residual voltage exists on the isolated circuit, and the isolating switch is operated to a grounding position after the isolated circuit determines that the voltage is zero, namely grounding is completed. The isolation switch cabinet provided by the utility model can judge whether the contact net is electrified or not, can discharge residual voltage on the contact net and can ground the contact net.

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 a schematic front view of an isolation switch cabinet according to the present invention;

fig. 2 is a rear view schematically illustrating an isolation switch cabinet according to the present invention;

FIG. 3 is a cross-sectional view taken along line I-I of FIG. 2;

fig. 4 is a sectional view taken along line H-H in fig. 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, fig. 2, fig. 3, and fig. 4, an isolation circuit having one end connected to the isolated circuit and the other end connected to the power supply end is disposed in the isolation switch cabinet, an isolation switch is disposed on the isolation circuit, one end of the isolation switch is connected to the isolated circuit, and the other end of the isolation switch is selectively connected to or not connected to the power supply end and the ground end. The isolating switch described in this embodiment is a common three-position isolating switch in the market, that is, the isolating switch has three working positions, namely a pass position, an open position and a ground position, and the other end of the isolating switch is connected to a power supply end and is the pass position; connected to the ground terminal, which is a ground potential; if not, it is an open circuit bit. The isolating switch is generally used for cutting off the current supply of an isolated circuit during outage and maintenance, and the isolated circuit is generally a contact net or a contact rail for supplying power to a subway. When the isolating switch operates to the access position, the power supply of the isolated circuit is switched on; when the isolating switch operates to an open circuit position, the power supply of the isolated circuit is cut off; when the isolating switch operates to the grounding position, the isolated circuit is grounded.

Specifically, a C-shaped section bar 1 is arranged in the isolating switch cabinet, and a three-station isolating switch 6 is fixed on the C-shaped section bar 1; a multi-fold section bar 2 is arranged in the isolating switch cabinet, and a plurality of insulators are arranged on the multi-fold section bar 2 and are used for fixedly supporting a contact net row 3, a wire inlet row 4 and a grounding row 5; one end of the isolating switch 6 is connected with one end of the 3, and the other end of the 3 is connected with the isolated circuit; a knife switch is arranged at one end of the isolating switch 6 at the 4 and 5, and the isolating switch 6 is connected with the 4 and 5 through the knife switch; the other end of 4 is connected with the power supply end, and the other end of 5 is grounded. The positive and negative rotation of the motor of the isolating switch 6 can be controlled by a button on a panel of the isolating switch cabinet or the output of a measurement and control device PLC so as to control the station of the isolating switch 6.

A pressure measuring circuit and a pressure relief circuit which are connected in parallel are arranged in the isolating switch cabinet; one end of the voltage measuring circuit is grounded, and the other end of the voltage measuring circuit is connected with the isolated circuit.

When the isolated circuit needs to be overhauled, the isolating switch needs to be grounded by operating the isolating switch to a grounding position. But before grounding, the voltage of the isolated circuit should be confirmed to be zero. And (5) switching on the pressure measuring switch, and reading a voltage value through the dial plate. Sometimes, residual voltage exists on the isolated circuit, when the voltage value is not zero, the voltage relief circuit is switched on to conduct current away, and if the voltage value is still high after the voltage relief circuit is switched on for multiple times, the isolated circuit is in a charged state, but not just the residual voltage. At this time, if the isolating switch is set to the ground, a short circuit may be caused, so the reason that the isolating circuit is still electrified should be checked first, and the steps of voltage measurement, voltage relief and grounding should be performed again after the problem is eliminated. The pressure measuring circuit and the pressure relief circuit are both connected to the PLC control center. Specifically, the pressure measurement circuit comprises two groups of pressure measurement loops which are redundant with each other. The pressure measuring circuit can operate under the condition that one group of pressure measuring circuits has faults, and the pressure measuring circuits can operate effectively. The voltage measuring loop comprises an isolation voltage transmitter, one end of the primary side of the isolation voltage transmitter is connected with the isolated circuit, and the other end of the primary side of the isolation voltage transmitter is grounded; and the secondary side of the isolation voltage transmitter is connected to a PLC control center. The voltage relief circuit comprises a high-power resistor 8, a fuse 9 and a voltage relief contactor 10 which are connected in series, and the voltage relief switch controls the on-off of the voltage relief circuit by controlling the on-off of the voltage relief contactor. In this embodiment, the high-power resistor is specifically a resistor of 31 Ω and 600W, and the voltage-relief circuit has two high-power resistors in common.

Particularly, the upper part of the isolating switch cabinet is provided with an SMC insulating plate 7, the SMC insulating plate 7 is used for fixing two high-power resistors due to the advantages of insulation, low smoke, zero halogen, flame retardance and strong rigidity and enough bearing capacity. The upper portion of isolator cabinet still is provided with fuse and pressure release contactor, and pressure release contactor includes two contact plates, and two contact plate one end meet, and the other end is connected on the controller, and the controller is connected to PLC control center. The controller is connected with the contact plates through springs, coils are arranged in the controller, when the PLC control center sends a command to supply power to the coils, the coils generate a magnetic field to form attraction force on the contact plates, and the contact plates overcome the elasticity of the springs to move towards the controller, so that the two contact plates are separated from each other, and a circuit is disconnected. The pressure relief loop element is provided with two high-power resistors 8, a fuse 9 and a pressure relief contactor 10, the energization and the outage of a coil of the pressure relief contactor 10 are controlled by the output of a measurement and control device PLC, and when the coil is energized, a main contact of the pressure relief contactor 10 is attracted, and the pressure relief loop is conducted; when the coil loses power, the main contact of the pressure relief contactor 10 is bounced open, and the pressure relief loop is disconnected.

The isolation switch cabinet further comprises a locking mechanism for locking the isolation switch. The three-position isolating knife in the isolating switch cabinet is an isolating knife which can be operated both electrically and manually, and a locking mechanism of the isolating knife is electrically locked and is manually locked to a stop pin.

Be provided with camera equipment in the isolator cabinet and be connected to PLC control center. In particular a camera.

The utility model realizes the real-time camera shooting function through the camera shooting equipment, and can upload the camera shooting function to the PLC control center, thereby realizing the function that the condition of the isolating switch is visible in a remote place. When equipment failure occurs, whether the position fault of the cutter is caused can be firstly confirmed by videos, and when the line of the overhead line system needs to be overhauled, whether the contact position is set or not can be visually checked through videos. The maintenance work is greatly facilitated, and the safety of maintenance personnel is guaranteed.

The above description is only an embodiment of the present invention, but the 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 disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An isolation switch cabinet is characterized in that an isolation circuit with one end connected with an isolated circuit and the other end connected with a power supply end is arranged in the isolation switch cabinet, an isolation switch is arranged on the isolation circuit, one end of the isolation switch is connected with the isolated circuit, and the other end of the isolation switch is selectively connected with or not connected with the power supply end and a grounding end; a pressure measuring circuit and a pressure relief circuit which are connected in parallel are arranged in the isolating switch cabinet; one end of the voltage measuring circuit is grounded, and the other end of the voltage measuring circuit is connected with the isolated circuit; and the pressure measuring circuit and the pressure relief circuit are both connected to a PLC control center.

2. The isolated switch cabinet of claim 1, wherein the voltage measurement circuit comprises two sets of mutually redundant voltage measurement loops, the voltage measurement loops comprise isolated voltage transmitters, one end of the primary side of each isolated voltage transmitter is connected with the isolated circuit, and the other end of each isolated voltage transmitter is grounded; and the secondary side of the isolation voltage transmitter is connected to a PLC control center.

3. The isolation switch cabinet according to claim 1, wherein the voltage relief circuit comprises a resistor, a contactor and a fuse, which are connected in series, and the contactor is connected to a PLC control center.

4. A disconnector cabinet according to claim 3, characterized in that the disconnector cabinet further comprises a locking mechanism for locking the disconnector.

5. The isolating switch cabinet according to claim 4, wherein a camera device is arranged in the isolating switch cabinet, and the camera device is connected to the PLC control center.