CN215681769U - Bus voltage protection device - Google Patents
Bus voltage protection device Download PDFInfo
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- CN215681769U CN215681769U CN202120629036.1U CN202120629036U CN215681769U CN 215681769 U CN215681769 U CN 215681769U CN 202120629036 U CN202120629036 U CN 202120629036U CN 215681769 U CN215681769 U CN 215681769U
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Abstract
The utility model relates to a bus voltage protection device, and belongs to the technical field of electrical automation application equipment. The technical scheme of the utility model is as follows: the high-fidelity measuring unit (7) is connected with the circuit breaker (2) in series to be connected into the main loop, and the output end of the high-fidelity measuring unit (7) is connected with the measurement and control unit controller (1); the current converter (6) and the depth current limiting device (3) are connected into a main loop in parallel and are connected to a load through a cable; the output end of the measurement and control unit controller (1) is respectively connected with a circuit formed by connecting the circuit breaker (2), the current converter (6) and the depth current limiting device (3) in parallel. The utility model has the beneficial effects that: through adopting the intelligent switching of transverter control degree of depth current-limiting device, realized the busbar voltage protection after the trouble takes place, when improving operational reliability, greatly reduced concatenate the huge electric energy loss that the reactor brought under the traditional mode.
Description
Technical Field
The utility model relates to a bus voltage protection device, and belongs to the technical field of electrical automation application equipment.
Background
In a power supply and distribution system of a mine enterprise, when an intranet branch has a short-circuit fault, a large short-circuit current can be generated, so that the voltage of a bus of the branch is very easy to drop sharply and can be reduced to 30% of the rated voltage, and abnormal power failure of other branches of the same bus is caused; when the incoming line of the external network has a fault, all the buses on one side are directly powered off, and the common reclosing technology can only supply power after several minutes, but still has the process from power failure to power supply. For example, in a ball milling and fine powder concentration system for mineral separation, once power is cut off suddenly, production stop of hours or even days is likely to occur due to material overstock; when sudden power failure occurs underground, great potential safety hazard is brought to the personal safety of underground operators. In mine enterprises, power supply safety is an important link of safety management, and serious safety accidents and huge economic losses are caused by abnormal power failure.
Disclosure of Invention
The utility model aims to provide a bus voltage protection device, which realizes bus voltage protection after a fault occurs by adopting a current converter to control intelligent switching of a deep current limiting device, greatly reduces huge electric energy loss caused by connecting a reactor in series in a traditional mode while improving the operation reliability, has high economic benefit, has simple structure and convenient use and maintenance, and solves the problems in the background technology.
The technical scheme of the utility model is as follows: a bus voltage protection device comprises a measurement and control unit controller, a circuit breaker, a depth current limiting device, a current converter and a high-fidelity measurement unit, wherein the high-fidelity measurement unit is connected with the circuit breaker in series and is connected into a main loop, and the output end of the high-fidelity measurement unit is connected with the measurement and control unit controller; the current converter and the depth current limiting device are connected into a main loop in parallel and connected to a load through a cable, the current converter is in a closed state in a normal state, and the depth current limiting device is in a short-circuit state; the output end of the measurement and control unit controller is respectively connected with a circuit formed by connecting the breaker, the current converter and the depth current limiting device in parallel.
The current transformer is connected in series behind a loop formed by connecting the current converter and the depth current limiting device in parallel, the output end of the current transformer is connected with the comprehensive protection device, the comprehensive protection device is mutually connected with the measurement and control unit controller, and the normal switching of the circuit breaker is controlled through the current transformer and the standby protection of the comprehensive protection device.
The utility model has the beneficial effects that: through adopting the intelligent switching of transverter control degree of depth current limiting device, realized the busbar voltage protection after the trouble takes place, when improving operational reliability, greatly reduced concatenate the huge power loss that the reactor brought under the traditional mode, have very high economic benefits, simple structure, use and maintenance convenience.
Drawings
FIG. 1 is a circuit block diagram of the present invention;
in the figure: the device comprises a measurement and control unit controller 1, a circuit breaker 2, a current transformer 4, a comprehensive protection device 5, a depth current limiting device 3, a current converter 6 and a high-fidelity measurement unit 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A bus voltage protection device comprises a measurement and control unit controller 1, a circuit breaker 2, a depth current limiting device 3, a current converter 6 and a high fidelity measurement unit 7, wherein the high fidelity measurement unit 7 is connected with the circuit breaker 2 in series to be connected into a main loop, and the output end of the high fidelity measurement unit 7 is connected with the measurement and control unit controller 1; the current converter 6 and the depth current limiting device 3 are connected into a main loop in parallel and connected to a load through a cable, the current converter 6 is in a closed state in a normal state, and the depth current limiting device 3 is in a short-circuit state; the output end of the measurement and control unit controller 1 is respectively connected with a circuit formed by connecting the circuit breaker 2, the current converter 6 and the depth current limiting device 3 in parallel.
The current transformer 4 is connected in series behind a loop formed by connecting a current converter 6 and a depth current limiting device 3 in parallel, the output end of the current transformer 4 is connected with the comprehensive protection device 5, the comprehensive protection device 5 is connected with the measurement and control unit controller 1, and the normal switching of the circuit breaker 2 is controlled through the current transformer 4 and the comprehensive protection device 5 in a standby protection mode.
In practical application, the current converter 6 and the deep current limiting device 3 are connected into a main loop in parallel and connected to a load through a cable, the current converter 6 is in a closed state in a normal state, and the deep current limiting device 3 is in a short-circuit state, so that electric energy loss is avoided.
The high-fidelity measuring unit 7 measures system voltage and current signals in real time, when the system has short-circuit fault, the high-fidelity measuring unit sends out signals and outputs the signals to the measuring and controlling unit controller 1, the signals are output to the current converter 6 within 5ms, the current converter is disconnected, the deep current limiting device 3 is connected into a main loop, and the short-circuit current is deeply limited by using the reactance resistance value of the deep current limiting device.
The measurement and control unit controller 1 outputs a signal to the current converter 6 after 0.3s, the current converter 6 is closed again, the voltage and current signals of the system are measured in real time through the high-fidelity measurement unit 7, if the current is normal at the moment, the early-stage fault is an instantaneous fault, the current converter 6 is not separated after being put into operation, and an alarm is given; if the current is still a short circuit current, indicating a permanent fault, the inverter 6 is opened again at 5ms, and the circuit is then interrupted by the circuit breaker 2, stopping the supply of power.
The current transformer 4 and the comprehensive protection device 5 can be used for protecting and controlling the normal switching of the circuit breaker 2 in a standby mode.
In the utility model, the model of a measurement and control unit controller 1 is ZRD, the model of a breaker 2 is VS1-12/1250-25, the model of a deep current limiting device 3 is XKK-10-4000-10, the model of a current transformer 4 is LZBJ 9-10C1, the model of a comprehensive protection device 5 is RCS-9647CS, the model of a current converter 6 is FSR-1250, and the model of a high fidelity measurement unit 7 is 2611B, so that technicians in the field can purchase and assemble the device from the market.
The utility model utilizes the deep current limiting device and the converter to be connected into the main loop in parallel, and the measurement and control unit controller controls the on-off of the converter in a time-sharing and sectional manner, thereby realizing the purpose of avoiding the loss of the deep current limiting device on electric energy in a normal state, simultaneously realizing the purpose of greatly reducing the impact of short-circuit current on a system power grid after the system has short-circuit fault, ensuring the normal maintenance of the same-section bus voltage and avoiding the condition of large-area power failure caused by low voltage.
The utility model has simple structure and convenient use and maintenance, and realizes the bus voltage protection after the fault occurs by adopting the current converter to control the intelligent switching of the depth current limiting device. The operation reliability is improved, and meanwhile, the huge electric energy loss caused by the fact that the reactors are connected in series in the traditional mode is greatly reduced, and the method has high economic benefits.
Claims (2)
1. A bus voltage protection device, characterized by: the device comprises a measurement and control unit controller (1), a circuit breaker (2), a depth current limiting device (3), a current converter (6) and a high fidelity measurement unit (7), wherein the high fidelity measurement unit (7) is connected with the circuit breaker (2) in series to be connected into a main loop, and the output end of the high fidelity measurement unit (7) is connected with the measurement and control unit controller (1); the current converter (6) and the deep current limiting device (3) are connected into a main loop in parallel and connected to a load through a cable, the current converter (6) is in a closed state in a normal state, and the deep current limiting device (3) is in a short-circuit state; the output end of the measurement and control unit controller (1) is respectively connected with a circuit formed by connecting the circuit breaker (2), the current converter (6) and the depth current limiting device (3) in parallel.
2. A bus voltage protection device according to claim 1, wherein: the device is characterized by further comprising a current transformer (4) and a comprehensive protection device (5), wherein the current transformer (4) is connected behind a loop formed by connecting a current converter (6) and a depth current limiting device (3) in parallel in series, the output end of the current transformer (4) is connected with the comprehensive protection device (5), the comprehensive protection device (5) is connected with a measurement and control unit controller (1) mutually, and the normal switching of the circuit breaker (2) is controlled through the current transformer (4) and the comprehensive protection device (5) in a standby protection mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120629036.1U CN215681769U (en) | 2021-03-29 | 2021-03-29 | Bus voltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120629036.1U CN215681769U (en) | 2021-03-29 | 2021-03-29 | Bus voltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215681769U true CN215681769U (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120629036.1U Active CN215681769U (en) | 2021-03-29 | 2021-03-29 | Bus voltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215681769U (en) |
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2021
- 2021-03-29 CN CN202120629036.1U patent/CN215681769U/en active Active
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