CN223093481U - A phase-separated isolation protection device for secondary circuit of voltage transformer - Google Patents
A phase-separated isolation protection device for secondary circuit of voltage transformer Download PDFInfo
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- CN223093481U CN223093481U CN202422033572.1U CN202422033572U CN223093481U CN 223093481 U CN223093481 U CN 223093481U CN 202422033572 U CN202422033572 U CN 202422033572U CN 223093481 U CN223093481 U CN 223093481U
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- air switch
- power supply
- wire control
- voltage transformer
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Abstract
The utility model provides a secondary circuit split-phase isolation protection device for a voltage transformer, which comprises a plurality of junction boxes and PT terminal boxes, wherein an original air switch is arranged in each PT terminal box, an active wire control air switch is arranged in each junction box, an operation indication module is arranged in each PT terminal box, and the original air switch and the active wire control air switch are both connected with the operation indication module.
Description
Technical Field
The utility model relates to the technical field of transformers, in particular to a secondary circuit phase separation and isolation protection device of a voltage transformer.
Background
Voltage transformer (PT for short) is widely used in electric power system, because the short circuit of the secondary side of the voltage transformer can cause burning loss of equipment, an air switch or a fuse is usually arranged in the loop of the secondary side of the voltage transformer to play a role of protection.
The voltage transformers in the high-voltage power grid are independently arranged, and a certain distance is usually reserved between the A, B, C-phase three transformers, as shown in fig. 1. In order to facilitate wiring of secondary equipment, the existing mode is that the secondary body coils of the voltage transformer A, B, C phases are led out to junction boxes of the respective phases, three-phase secondary circuits are led to PT terminal boxes from the junction boxes through independent secondary cables respectively, and the PT terminal boxes are sent out to secondary equipment such as protection and measuring instruments through secondary cables for collection and use through air switches or fuses which are arranged in a centralized mode, as shown in figure 2.
The prior art has the following defects:
1) When the short circuit occurs between the split junction box of the voltage transformer and a section of cable connected with the PT terminal box, the air switch of the PT terminal box cannot be cut off due to the fact that the fault point is in front of the air switch of the PT terminal box, the fault cannot be cut off, the secondary side of the voltage transformer is always in a short circuit state, the voltage transformer is burnt out and damaged, power station equipment is forced to be stopped, and economic loss is caused.
2) For 220kV and above voltage transformers, the junction box is generally quite high from the ground according to the requirement of an electrified safety distance, and operation and maintenance personnel cannot open the junction box to observe and operate without a ladder or an operation vehicle. If a common air switch is installed in the junction box, once the air switch in the junction box trips due to faults or other reasons in the live operation process of the voltage transformer, operation and maintenance personnel cannot directly check on the ground, and the safety distance and personnel electric shock risks need to be considered when the junction box is opened to relate to ascending operation.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a secondary circuit split-phase isolation protection device for a voltage transformer, which can effectively protect the short-circuit fault of a split-phase secondary circuit between a secondary junction box of the voltage transformer body and a PT terminal box, and can control and monitor the state of an air switch of the secondary junction box of each split-phase body at the PT terminal box, thereby facilitating the secondary circuit isolation during overhaul or defect treatment.
In order to solve the technical problems, the technical scheme adopted by the utility model is that the secondary circuit phase-separation protection device of the voltage transformer comprises a plurality of junction boxes and PT terminal boxes, wherein the PT terminal boxes are internally provided with original air switches, the junction boxes are internally provided with active wire control air switches, the PT terminal boxes are internally provided with operation indication modules, and the original air switches and the active wire control air switches are connected with the operation indication modules;
the operation indication module comprises a power supply binding post and a plurality of wiring units, wherein each wiring unit comprises an active wire control air switch binding post used for being connected with an active wire control air switch and an original air switch binding post used for being connected with an original air switch;
Three active wire control air switch binding posts are arranged, one binding post is connected with the positive electrode of the power supply, and the other two binding posts are connected with the negative electrode of the power supply;
Original air switch terminal is equipped with three, and one of them terminal is connected with the power positive pole, then divide into two ways after being connected with separating brake button and closing brake button respectively, be connected with two other terminal again, two other terminal are used for being connected with original air switch, and original air switch is connected to the power negative pole again.
Preferably, two binding posts connected with the power supply negative electrode in the active wire control air switch binding posts are respectively connected with the opening LED indicator lamp and the closing LED indicator lamp and then connected to the power supply negative electrode.
Preferably, an indication power supply knob switch is arranged on a power supply circuit of the active wire control air switch binding post.
Preferably, an operation power knob switch is arranged on a power supply circuit of the original air switch binding post.
The utility model provides a secondary circuit phase separation isolation protection device of a voltage transformer, which has the following beneficial effects:
The method has the advantages of eliminating the protection dead zone and avoiding the damage of the voltage transformer equipment.
When the cable insulation of voltage transformer terminal box to PT terminal box one section is damaged or wiring error leads to the short circuit, air switch in the transformer terminal box is jumped, keeps apart fault point and voltage transformer body, avoids leading to voltage transformer to burn out because of secondary side short circuit.
The method has the advantages that the method can manually and intensively control the split-phase air-break isolation, and avoid the power failure of the voltage transformer.
When the defect of the secondary circuit of the voltage is required to be treated in the operation, the system can be used for manually operating and disconnecting the empty switch of the split-phase junction box at the PT terminal box on the ground, so that the circuit between the junction box and the PT terminal box is not electrified, and the defect treatment on the secondary circuit of the section no longer requires the power failure of the voltage transformer equipment.
The third advantage is that the system is high in self-safety.
The cable active control mode is adopted, the control power supply can be disconnected during normal operation, the reliability under the condition of strong electromagnetic interference is effectively ensured, and the air switch is prevented from being separated and combined by mistake due to control reasons.
The four advantages are high working efficiency.
When the voltage transformer is subjected to power failure maintenance, the insulation of the outgoing line and the secondary circuit of the transformer body is required to be checked as a periodic maintenance project, and in the past, the insulation between the outgoing line and the secondary cable from the split-phase junction box to the PT terminal box section is distinguished, and the secondary wiring can only be detached by ascending a height to open the split-phase junction box, so that the insulation is respectively checked. After the system provided by the invention is arranged on the secondary side of the voltage transformer, PT terminals on the ground can be directly isolated from secondary outgoing lines of the transformer of the junction box through the system, so that the working efficiency is greatly improved.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a diagram of a prior art voltage transformer arrangement;
FIG. 2 is a schematic diagram of a secondary wiring relationship of a prior voltage transformer;
FIG. 3 is a schematic diagram of the structure of the present utility model;
FIG. 4 is a schematic diagram of an operation indication module according to the present utility model;
FIG. 5 is a schematic diagram of the internal wiring of the operation indication module of the present utility model;
fig. 6 is a schematic structural diagram of an air switch according to the present utility model.
Detailed Description
As shown in fig. 3-5, a secondary circuit phase separation protection device of a voltage transformer comprises a plurality of junction boxes 1 and PT terminal boxes 2, wherein an original air switch 3 is arranged in each PT terminal box 2, an active wire control air switch 4 is arranged in each junction box 1, an operation indication module 5 is arranged in each PT terminal box 2, and the original air switch 3 and the active wire control air switch 4 are connected with the operation indication module 5;
The operation indication module 5 comprises a power supply binding post 6 and a plurality of wiring units 7, wherein each wiring unit comprises an active wire control air switch binding post 8 used for being connected with an active wire control air switch 4 and an original air switch binding post 9 used for being connected with an original air switch 3;
Three active wire control air switch binding posts 8 are arranged, one binding post is connected with the positive electrode of the power supply, and the other two binding posts are connected with the negative electrode of the power supply;
The original air switch binding posts 9 are provided with three binding posts, one binding post is connected with the positive electrode of the power supply, then the two binding posts are respectively connected with the opening button 10 and the closing button 11 after being divided into two paths, the other two binding posts are connected with the original air switch 3, and the original air switch 3 is connected to the negative electrode of the power supply.
Preferably, two terminals connected with the power supply cathode in the active wire control air switch terminal 8 are respectively connected with the opening LED indicator lamp 12 and the closing LED indicator lamp 13 and then connected to the power supply cathode.
Preferably, an indication power knob switch 14 is arranged on the power supply circuit of the active wire control air switch binding post 8.
Preferably, an operation power knob switch 15 is arranged on the power supply circuit of the original air switch binding post 9.
Preferably, three dry junction boxes 1 and three junction units 7 are provided for three-phase wiring. The device can flexibly adjust the number of phases.
Specifically, the operation indication module is provided with 2 power supply switching switches which are respectively used for controlling the operation power supply and the indication power supply. The operation indication module is provided with an operation button for controlling the A, B, C-phase junction box to open and close in a hollow mode, A, B, C-phase buttons are marked on the button to distinguish the two phases, and red color indicates the combination and green color indicates the division. The operation indication module is provided with 6 indication lamps which are respectively lightened to indicate A, B, C that the phase is open and is in a closing and opening state. The operation indication module is provided with 20 wiring terminals, wherein the upper left 2 wiring terminals are externally connected with a working power supply and are used for operating the power supply and indicating the power supply, the upper 9 wiring terminals are used for indicating the on-off state of the air switch of the A, B, C-phase wiring box in a three-group mode, and the lower 9 wiring terminals are used for controlling the on-off operation of the A, B, C-phase wiring box air switch in a three-group mode. The operation indication module is arranged in the PT terminal box, the size of the operation indication module is consistent with that of the 4-bit air switch, and the operation indication module can be fixed on the air switch guide rail clamping groove.
The secondary cable is provided with 3 groups in total, and is respectively connected with an operation indication module of the PT terminal box and an active wire control air switch and auxiliary contacts thereof in the A, B, C-phase junction box.
As shown in fig. 6, the air switch has a common air switch protection function, and can be remotely controlled to be opened or closed through an external power connection. And the secondary cable is connected with the operation indication module to receive the opening and closing instructions. The active wire control air switch is arranged in the A, B, C phase junction box, and auxiliary contacts which are matched with the active wire control air switch provide the on-off state and the on-off state of the active wire control air switch to an operation indication module in the PT terminal box.
The working principle of the device is as follows:
1) During normal operation, active wire control air switches in the system are all on, the on-state of each auxiliary contact is on, A, B, C phase on-state indicator lights on an operation indicator module of the PT terminal box are on, and sub-state lights are not on.
2) At a certain moment, the secondary circuit between the junction box of the voltage transformer and the PT terminal box breaks down, and the active wire control air switch can automatically trip to cut off the fault. When operation and maintenance personnel arrive at the site inspection, A, B, C phase indicator lights on the operation indication module of the PT terminal box can be observed, the A phase is supposed to be failed, the A phase combined state light is not on, the branch state light is on, the B, C phase state light is on, the branch state light is not on, and the operation and maintenance personnel can judge that an air switch in the A phase junction box of the transformer trips.
3) When the fault part is processed and power transmission is required to be restored to the secondary circuit of the voltage transformer, an operation and maintenance personnel presses an A phase combination button on the operation indication module at the PT terminal box, and after an active wire control air switch in the A phase connection box receives a combination command to be normally closed, an A phase combination indication lamp state lamp on the operation indication module is on, and a sub-state lamp is not on.
The above embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the present utility model, and the scope of the present utility model should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this utility model are also within the scope of the utility model.
Claims (4)
1. The secondary circuit split-phase isolation protection device of the voltage transformer comprises a plurality of junction boxes (1) and PT terminal boxes (2), wherein an original air switch (3) is arranged in each PT terminal box (2), and the secondary circuit split-phase isolation protection device is characterized in that an active wire control air switch (4) is arranged in each junction box (1), an operation indication module (5) is arranged in each PT terminal box (2), and the original air switch (3) and the active wire control air switch (4) are connected with the operation indication module (5);
The operation indication module (5) comprises a power supply binding post (6) and a plurality of wiring units (7), wherein each wiring unit comprises an active wire control air switch binding post (8) used for being connected with an active wire control air switch (4) and an original air switch binding post (9) used for being connected with an original air switch (3);
Three active wire control air switch binding posts (8) are arranged, one binding post is connected with the positive electrode of the power supply, and the other two binding posts are connected with the negative electrode of the power supply;
Original air switch terminal (9) are equipped with three, and one of them terminal is connected with the power positive pole, then divide into behind two-way respectively with separating brake button (10) and closing button (11) and be connected with two other terminal again, two other terminal are used for being connected with original air switch (3), and original air switch (3) are connected to the power negative pole again.
2. The secondary circuit phase separation protection device of the voltage transformer is characterized in that two binding posts connected with a power supply negative electrode in the active wire control air switch binding post (8) are respectively connected with a switching-off LED indicator lamp (12) and a switching-on LED indicator lamp (13) and then connected to the power supply negative electrode.
3. The secondary circuit phase separation protection device of the voltage transformer is characterized in that an indication power supply knob switch (14) is arranged on a power supply circuit of the active wire control air switch binding post (8).
4. The secondary circuit phase separation protection device of the voltage transformer is characterized in that an operation power knob switch (15) is arranged on a power supply circuit of the original air switch binding post (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422033572.1U CN223093481U (en) | 2024-08-21 | 2024-08-21 | A phase-separated isolation protection device for secondary circuit of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422033572.1U CN223093481U (en) | 2024-08-21 | 2024-08-21 | A phase-separated isolation protection device for secondary circuit of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223093481U true CN223093481U (en) | 2025-07-11 |
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ID=96290614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202422033572.1U Active CN223093481U (en) | 2024-08-21 | 2024-08-21 | A phase-separated isolation protection device for secondary circuit of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223093481U (en) |
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2024
- 2024-08-21 CN CN202422033572.1U patent/CN223093481U/en active Active
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