CN220570312U - PT electrified interlocking protection device - Google Patents
PT electrified interlocking protection device Download PDFInfo
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- CN220570312U CN220570312U CN202322193212.3U CN202322193212U CN220570312U CN 220570312 U CN220570312 U CN 220570312U CN 202322193212 U CN202322193212 U CN 202322193212U CN 220570312 U CN220570312 U CN 220570312U
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- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 5
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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Abstract
The utility model provides a PT electrified interlocking protection device, which comprises: PT dolly, PT dolly parking stall detection element, voltage detection element, electromagnetic lock, the control unit. And a locking hole is arranged on the transmission shaft of the PT trolley. The PT trolley position detection component is used for detecting the position of the PT trolley. The voltage detection component collects bus three-phase voltage. An electromagnetic lock is disposed adjacent the drive shaft of the PT trolley and has a locking pin movable between a first position inserted into the locking aperture and a second position withdrawn from the locking aperture. The control unit is in communication connection with the PT trolley position detection component, the voltage detection component and the electromagnetic lock, and is configured to determine whether a voltage exists on the bus, and when the voltage exists on the bus and the PT trolley is in a working position, the electromagnetic lock is driven to move to a first position. The PT electrified interlocking protection device has the characteristics of simple wiring, easiness in manufacturing, low cost, small volume, convenience in installation, strong practicability and the like.
Description
Technical Field
The utility model relates to the field of operation and maintenance of a power PT live-line interlocking protection device, in particular to a PT live-line interlocking protection device.
Background
The production and operation of large-scale enterprises such as steel and smelting require a large amount of electric power, and the transportation and distribution of the electric power are mainly realized by a high-voltage and low-voltage electric cabinet. After the high-low voltage electrical cabinet normally operates for a certain period, a plurality of devices on a section of bus can be operated due to periodic fixed inspection or operation mode adjustment.
Some high-voltage power supply networks mainly operate in a single bus split mode, and each section of bus is provided with a PT cabinet (voltage transformer cabinet) which is responsible for providing secondary voltage for all the distribution open circuits of the section of bus. All protection measurement and measurement voltages of the open circuit are derived from secondary voltage provided by PT, when the bus runs normally, the PT cabinet suddenly exits from the working position, so that the protection device perceives the disappearance of the bus voltage, and the protection device makes wrong judgment, so that the normal power supply loop is tripped by misoperation, and serious production equipment accidents are caused.
Therefore, how to prevent the PT cabinet from accidentally exiting from the working position to cause the malfunction trip of the normal power supply loop is a problem to be solved by those skilled in the art.
Disclosure of Invention
The main object of the present utility model is to provide a PT live interlock protection device, which solves the above-mentioned problems in the prior art.
According to an aspect of the present utility model, there is provided a PT live interlock protection apparatus including:
the PT trolley is provided with a locking hole on a transmission shaft;
the PT trolley position detection component is used for detecting the position of the PT trolley;
the voltage detection component is used for collecting bus three-phase voltages;
an electromagnetic lock disposed near a drive shaft of the PT dolly and having a lock pin movable between a first position inserted into the lock hole and a second position withdrawn from the lock hole;
the control unit is in communication connection with the PT trolley position detection component, the voltage detection component and the electromagnetic lock, and is configured to determine whether a voltage exists on a bus or not and drive the electromagnetic lock to move to the first position when the voltage exists on the bus and the PT trolley is in the working position.
According to an embodiment of the utility model, the control unit is configured to determine whether a voltage is present on the bus by comparing the three-phase voltage detected by the voltage detection means with a reference voltage.
According to one embodiment of the utility model, the control unit is configured to drive the electromagnetic lock to move to the first position when a voltage is present in at least one phase of the busbar.
According to one embodiment of the utility model, the control unit adopts a singlechip.
According to one embodiment of the utility model, the electromagnetic lock further comprises a lock body, wherein an electromagnetic lock coil is arranged in the lock body, when the bus is in voltage, the electromagnetic lock coil electrically drives the lock pin to act, and the lock pin moves to the first position.
According to one embodiment of the utility model, the locking pin is a tongue protruding from the lock body, said tongue being aligned with the locking aperture.
According to one embodiment of the utility model, the electromagnetic lock further comprises a manual unlocking button.
According to one embodiment of the utility model, the locking hole is a through slot penetrating the drive shaft.
According to one embodiment of the utility model, the locking hole is a blind slot that does not penetrate the drive shaft.
According to one embodiment of the present utility model, the voltage detection section includes a three-phase transformer, a rectifying and filtering circuit, and an a/D converter.
Due to the adoption of the technical scheme, the PT live interlocking protection device has the characteristics of simple wiring, easiness in manufacturing, low cost, small size, convenience in installation, strong practicability and the like. The device can prevent misoperation of operators under special conditions such as equipment operation mode adjustment or bus overhaul, and the like, so that the PT trolley leaves a working position to cause tripping of low-voltage action of an open circuit for setting low-voltage protection, and serious production equipment accidents are effectively avoided.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic view showing the general structure of a PT live interlock protection device according to an embodiment of the present utility model;
FIG. 2 is a side view of an electromagnetic lock and PT drive shaft according to one embodiment of the present utility model;
FIG. 3 is a top view of an electromagnetic lock and PT drive shaft according to one embodiment of the present utility model;
FIG. 4 is a block diagram of signal detection and control hardware according to one embodiment of the utility model.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terms used in the specification are used herein for the purpose of describing particular embodiments only and are not intended to limit the present utility model, for example, the orientations or positions indicated by the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are orientations or positions based on the drawings, which are merely for convenience of description and are not to be construed as limiting the present utility model.
The terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion; the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the description of the utility model and the claims and the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Fig. 1 illustrates an overall structural schematic diagram of a PT live interlock protection device according to an embodiment of the present utility model. The PT live interlock protection apparatus generally includes a PT dolly 100, a PT dolly position detecting part 200, a voltage detecting part 300, an electromagnetic lock 400, and a control unit 500. The structure of each component is described in detail below.
The PT dolly 100, i.e. a voltage transformer cart, may also be referred to as PT cart. The voltage transformer is arranged on the handcart by the component, so that the voltage transformer is convenient to maintain and replace, and the fuse circuit is convenient and simple to replace, so that the maintenance becomes safer, more convenient and simpler. The PT trolley 100 functions as a voltage transformer mainly to supply power to a measuring instrument and a relay protection device, to measure voltage, power and electric energy of a line, or to protect valuable equipment, a motor and a transformer in the line when the line fails.
The PT trolley 100 mainly comprises a housing, a conjoined insulator, contacts, contact arms/bushings, fuses, optional lightning arresters, discharge counters, voltage transformers, chassis, cover members, sensors, etc.
The PT trolley 100 mainly has three positions of working, testing and disconnecting. In the working position, the circuit breaker is connected with primary equipment (bus), and after switching on, power is transmitted to the power transmission line from the bus through the circuit breaker. In the test position, the secondary plug can be inserted on the socket to obtain a power supply, the circuit breaker can perform switching-on and switching-off operations, the corresponding indicator lights are on, the circuit breaker is not connected with primary equipment, and various operations can be performed, but the circuit breaker does not have any influence on the load side, so the circuit breaker is called the test position. In the service position, the circuit breaker is not connected with the primary equipment, the operation power supply is lost (the secondary plug is pulled out), and the circuit breaker is in the opening position.
In the embodiment of the present utility model, as shown in fig. 1 to 3, the PT trolley 100 has a driving shaft 110, and a locking hole 111 is provided on the driving shaft 110. The locking hole 111 may be a through groove extending through the entire diameter of the drive shaft 110, or may be a blind groove extending only a partial length of the diameter of the drive shaft 110 without penetrating through the entire diameter.
The PT dolly position detecting part 200 is used to detect the position of the PT dolly, i.e. to determine whether the PT dolly 100 is in the working position, the test position or the off position. In order to avoid the PT trolley from being accidentally separated from the working position under the normal working condition, it is necessary to detect and determine the position of the PT trolley first and transmit the detection result to the control unit 500. The PT dolly position detecting part 200 may employ a detecting device commonly used in the art. The specific form of the PT carriage position detecting part 200 is not limited on the premise of satisfying the above-described detecting function.
The voltage detection part 300 is used to collect bus three-phase voltages in order to determine whether the bus exists voltage. In the utility model, a bus refers to connection of each level of voltage devices in a power substation and connection of electric equipment such as a transformer and corresponding power distribution devices, and bare wires or stranded wires with rectangular or circular cross sections are mostly adopted. The three-phase voltage thereof can be taken from the bus voltage transformer. In some embodiments, as shown in fig. 4, the voltage detecting part 300 may include a three-phase transformer for stepping down a three-phase voltage, and optionally, a rectifying and filtering circuit and an a/D converter for rectifying and filtering an ac voltage to obtain a dc voltage. The dc voltage may be transmitted to the control unit 500.
In order to prevent the PT trolley from leaving the working position and causing the trip of the low-voltage action of the distribution open circuit with the low-voltage protection under the special conditions of equipment operation mode adjustment or bus maintenance and the like caused by misoperation of operators, the utility model is provided with the electromagnetic lock 400 for preventing the PT trolley from acting. Fig. 2 is a side view of an electromagnetic lock 400 and a PT transmission shaft according to an embodiment of the present utility model, and fig. 3 is a top view of the electromagnetic lock 400 and the PT transmission shaft according to an embodiment of the present utility model. As shown, the electromagnetic lock 400 is disposed near the drive shaft 110 of the PT trolley. The electromagnetic lock 400 has a lock body and a lock pin, which may be a tongue protruding from the lock body, the lock pin being aligned with the locking hole 111, the lock pin being movable between a first position inserted into the locking hole 111 and a second position withdrawn from the locking hole 111. When the lock pin is inserted into the locking hole 111, the PT dolly transmission shaft is locked and cannot be separated from the current position. When the lock pin is withdrawn from the locking hole 111, the PT dolly drive shaft can be actuated and switch positions. An electromagnetic lock coil can be arranged in the lock body, when the voltage exists on the bus, the electromagnetic lock coil electrically drives the lock pin to act, and the lock pin moves into the locking hole 111 to lock the PT trolley transmission shaft. Alternatively, the electromagnetic lock 400 may be further provided with a manual unlocking button, and in a special case, the unlocking operation may be performed by the manual unlocking button.
The control unit 500 is communicatively connected with the PT dolly position detecting part 200, the voltage detecting part 300, and the electromagnetic lock 400. The control unit 500 is configured to determine whether a voltage is present on the bus bar. For example, referring to fig. 1 and 4, the control unit 500 may be connected with an output interface of an a/D conversion chip of the voltage detection part 300 through a communication bus, receive an output signal of the a/D conversion chip, and compare the signal with a reference voltage to determine whether a voltage exists on the bus. When the bus bar has a voltage and the PT trolley is in the operating position, the control unit 500 drives the electromagnetic lock 400 to move to the first position (i.e., the locking position). For example, the control unit 500 is configured to drive the electromagnetic lock 400 to move to the first position when a voltage is present in at least one phase of the bus. The control unit 500 may use a single-chip microcomputer, for example, 430 single-chip microcomputer, which has lower power consumption and higher reliability. The adoption singlechip can simplify the circuit design, lets interlock's volume less, practices thrift installation space, more convenient installation.
The PT electrified interlocking protection device has the characteristics of simple wiring, easiness in manufacturing, low cost, small volume, convenience in installation, strong practicability and the like. The device can prevent misoperation of operators under special conditions such as equipment operation mode adjustment or bus overhaul, and the like, so that the PT trolley leaves a working position to cause tripping of low-voltage action of an open circuit for setting low-voltage protection, and serious production equipment accidents are effectively avoided.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A PT live interlock protection device, comprising:
the PT trolley is provided with a locking hole on a transmission shaft;
the PT trolley position detection component is used for detecting the position of the PT trolley;
the voltage detection component is used for collecting bus three-phase voltages;
an electromagnetic lock disposed near a drive shaft of the PT dolly and having a lock pin movable between a first position inserted into the lock hole and a second position withdrawn from the lock hole;
the control unit is in communication connection with the PT trolley position detection component, the voltage detection component and the electromagnetic lock, and is configured to determine whether a voltage exists on a bus or not and drive the electromagnetic lock to move to the first position when the voltage exists on the bus and the PT trolley is in the working position.
2. The PT live interlock protection device of claim 1, wherein the control unit is configured to determine whether a bus bar has a voltage by comparing the three-phase voltage detected by the voltage detecting part with a reference voltage.
3. The PT live interlock protection device of claim 1, wherein the control unit is configured to drive the electromagnetic lock to move to the first position when a voltage is present on at least one phase of the bus bar.
4. The PT live interlock protection device of claim 1, wherein the control unit employs a single chip microcomputer.
5. The PT live interlock protection device of claim 1, wherein the electromagnetic lock further comprises a lock body, wherein an electromagnetic lock coil is provided in the lock body, and when a voltage is applied to the bus, the electromagnetic lock coil electrically drives the lock pin to move to the first position.
6. The PT live interlock protection device of claim 5, wherein the locking pin is a tongue protruding from the lock body, the tongue aligned with the locking aperture.
7. The PT live interlock protection device of claim 1, wherein the electromagnetic lock further comprises a manual unlock button.
8. The PT live interlock protection device of claim 1, wherein the locking aperture is a through slot through the drive shaft.
9. The PT live interlock protection device of claim 1, wherein the locking aperture is a blind slot that does not penetrate the drive shaft.
10. The PT live interlock protection device of claim 1, wherein the voltage detecting part includes a three-phase transformer, a rectifying and filtering circuit, and an a/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322193212.3U CN220570312U (en) | 2023-08-15 | 2023-08-15 | PT electrified interlocking protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322193212.3U CN220570312U (en) | 2023-08-15 | 2023-08-15 | PT electrified interlocking protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220570312U true CN220570312U (en) | 2024-03-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322193212.3U Active CN220570312U (en) | 2023-08-15 | 2023-08-15 | PT electrified interlocking protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220570312U (en) |
-
2023
- 2023-08-15 CN CN202322193212.3U patent/CN220570312U/en active Active
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