CN215681798U - Voltage parallel device capable of automatically switching states - Google Patents
Voltage parallel device capable of automatically switching states Download PDFInfo
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- CN215681798U CN215681798U CN202120875630.9U CN202120875630U CN215681798U CN 215681798 U CN215681798 U CN 215681798U CN 202120875630 U CN202120875630 U CN 202120875630U CN 215681798 U CN215681798 U CN 215681798U
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Abstract
The utility model provides a voltage parallel device capable of automatically switching states, and belongs to the technical field of power grid operation. The device is arranged on a secondary voltage bus of a first section of bus and a secondary voltage bus of a second section of bus and comprises a state change-over switch, a first electric signal acquisition assembly, a second electric signal acquisition assembly and a microprocessor. When a certain phase of one section of bus secondary voltage bus or two-section bus secondary voltage bus loses voltage, the first electric signal acquisition assembly or the second electric signal acquisition assembly cannot normally acquire corresponding electric signals, at the moment, the microprocessor judges the line fault, the control state change-over switch is closed, the one section of bus secondary voltage bus and the two-section bus secondary voltage bus are switched to be in a parallel state, the electric quantity loss from the circuit fault to operation and maintenance personnel in a period of time when arriving at a site is reduced, the safety instrument in the circuit is ensured to normally work in the period of time, and the safety risk is reduced.
Description
Technical Field
The utility model belongs to the technical field of power grid operation, and particularly relates to a voltage paralleling device capable of automatically switching states.
Background
At present, in the operation and maintenance process of a 35kV or 10kV transformer substation, when a certain phase of a high-voltage fuse of a voltage transformer of an I section bus or an II section bus is fused or the voltage transformer fails, a power transformation operation and maintenance worker needs to cut a voltage paralleling device from 'splitting' to 'paralleling' on site, then replace the voltage transformer or the high-voltage fuse, and perform current inspection and maintenance. However, in the existing unattended substation, the operation and maintenance personnel are relatively far away from the substation, and a certain time is required for the operation and maintenance personnel to arrive at the site. In the process, the voltage paralleling device is always in a 'splitting' state, so that a certain phase of the I section bus or the II section bus loses voltage, the electric quantity cannot be accurately counted, the electricity charge loss is caused, the normal operation of related instrument equipment is influenced, and potential safety hazards exist.
Disclosure of Invention
In view of this, the utility model provides a voltage parallel device capable of automatically switching states, so as to solve the technical problems that after a voltage transformer of a first-segment bus or a second-segment bus fails, the voltage transformer cannot be timely switched to the parallel state, so that the electric quantity metering is inaccurate, and related instrument equipment cannot normally operate in the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a voltage paralleling device capable of automatically switching states is arranged on a section of bus secondary voltage bus and comprises a state switch, a first electric signal acquisition assembly, a second electric signal acquisition assembly and a microprocessor, wherein the input end of the first electric signal acquisition assembly is electrically connected with the section of bus secondary voltage bus, and the output end of the first electric signal acquisition assembly is connected with the signal input end of the microprocessor and is used for acquiring the electric signal of the section of bus secondary voltage bus; the input end of the second electric signal acquisition assembly is electrically connected with the secondary voltage bus of the second section of bus, and the output end of the second electric signal acquisition assembly is connected with the signal input end of the microprocessor and is used for acquiring the electric signal of the secondary voltage bus of the second section of bus; the output end of the microprocessor is connected with the state change-over switch and is used for controlling the state change-over switch to be opened or closed according to the electric signal of the secondary voltage bus of the first section of bus and the electric signal of the secondary voltage bus of the second section of bus, so that the parallel and disconnection state of the secondary voltage bus of the first section of bus and the secondary voltage bus of the second section of bus is switched.
Preferably, the microprocessor includes a fault determining module, and the fault determining module is configured to generate a splitting signal or a parallel signal according to the electrical signal of the first-segment bus secondary voltage bus and the electrical signal of the second-segment bus secondary voltage bus.
Preferably, the microprocessor further comprises a short circuit reset module, and the short circuit reset module is configured to generate a reset signal according to an electrical signal of the first segment of the bus secondary voltage bus or an electrical signal of the second segment of the bus secondary voltage bus.
Preferably, the microprocessor further comprises an overtime early warning module, wherein the overtime early warning module is used for acquiring the fault time of the state changeover switch in the parallel state, and sending an alarm signal when the fault time exceeds a set time threshold.
Preferably, the overtime early warning module includes a timing unit and an overtime judging unit, the timing unit is configured to obtain a fault duration of the state switch in the parallel state, and the overtime judging unit is configured to compare the fault duration with a set duration threshold, and send an alarm signal when the fault duration is greater than the duration threshold.
Preferably, the overtime early warning module further comprises a reset unit, and the reset unit is used for responding to the confirmation of an operator to an alarm signal and restoring the fault duration to a zero position.
Preferably, a power supply assembly is further included for providing power to the microprocessor.
According to the technical scheme, the utility model provides the voltage paralleling device capable of automatically switching the states, and the voltage paralleling device has the beneficial effects that: a first electric signal acquisition component, a second electric signal acquisition component and a microprocessor are arranged, when a certain phase of a first section of bus secondary voltage bus or a second section of bus secondary voltage bus loses voltage, the first electric signal acquiring component or the second electric signal acquiring component cannot normally acquire the corresponding electric signal, at this time, the microprocessor judges the line fault and can not normally supply power for the metering instrument, the security instrument and the like, at the moment, controlling the state switch to be closed, switching the first section bus secondary voltage bus and the second section bus secondary voltage bus to be parallel, the metering instrument and the security instrument of the fault circuit are supplied with power through the circuit without faults, electric quantity loss from the circuit fault to the operation and maintenance personnel reaching the site within a period of time is reduced, the security instrument in the circuit is ensured to work normally within the period of time, and safety risks are reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a voltage paralleling apparatus capable of automatically switching states.
FIG. 2 is a schematic diagram of a circuit control module of a voltage paralleling apparatus capable of automatically switching states.
In the figure: the system comprises a voltage parallel device 10 capable of automatically switching states, a first-section bus secondary voltage bus 11, a second-section bus secondary voltage bus 12, a state switch 100, a first electric signal acquisition assembly 200, a second electric signal acquisition assembly 300, a microprocessor 400, a fault judgment module 410, an overtime early warning module 420, a timing unit 421, an overtime judgment unit 422, a reset unit 423 and a short circuit reset module 430.
Detailed Description
The technical scheme and the technical effect of the utility model are further elaborated in the following by combining the drawings of the utility model.
Referring to fig. 1 and 2, in an embodiment, a voltage paralleling device 10 capable of automatically switching states is disposed on a first section of bus secondary voltage bus 11 and a second section of bus secondary voltage bus 12, and includes a state switch 100, a first electrical signal obtaining component 200, a second electrical signal obtaining component 300, and a microprocessor 400, wherein an input end of the first electrical signal obtaining component 200 is electrically connected to the first section of bus secondary voltage bus 11, and an output end of the first electrical signal obtaining component is connected to a signal input end of the microprocessor 400, for obtaining an electrical signal of the first section of bus secondary voltage bus 11. The input end of the second electrical signal obtaining component 300 is electrically connected to the second segment bus secondary voltage bus 12, and the output end is connected to the signal input end of the microprocessor 400, so as to obtain the electrical signal of the second segment bus secondary voltage bus 12. The output end of the microprocessor 400 is connected to the state switch 100, and is configured to control the on/off of the state switch 100 according to the electrical signal of the first-segment bus secondary voltage bus 11 and the electrical signal of the second-segment bus secondary voltage bus 12, so as to realize switching between parallel and disconnected states of the first-segment bus secondary voltage bus 11 and the second-segment bus secondary voltage bus 12.
For example, the first bus secondary voltage bus 11 and the second bus secondary voltage bus 12 each include a three-phase circuit, which is respectively counted as: i mother a1I mother B1I mother C1And II a mother2II parent b2II parent c2The first electrical signal obtaining component 200 is used for obtaining an I-mother a1I mother B1I mother C1Including but not limited to voltage signals, current signals. Preferably, the first electrical signal obtaining component 200 includes three first electrical signals respectively corresponding to the first electrical signal obtaining component and the second electrical signal obtaining component1I mother B1I mother C1Electrically connected voltage transformers for respectively obtaining I bus a1I mother B1I mother C1The voltage signal of (2). The first electrical signal acquisition component 200 may also be a current transformer electrically connected to a voltage transformer and a high voltage fuse of the I-section bus or the II-section bus, respectively, or a digital sensor connected to a metering device, a security device, and the like disposed on the secondary voltage bus 11 of the first section bus in a communication manner. Preferably, the second electrical signal obtaining component 300 includes three signals respectively corresponding to II-mother a2II parent b2II parent c2Electrically connected voltage transformers for respectively obtaining II bus a2II parent b2II parent c2The voltage signal of (2). The first electrical signal acquisition component 200 may also be a current transformer electrically connected to a voltage transformer and a high voltage fuse of the I-section bus or the II-section bus, respectively, or a digital sensor connected to a metering device, a security device, and the like disposed on the secondary voltage bus 11 of the first section bus in a communication manner.
When a certain phase of the first section of bus secondary voltage bus 11 or the second section of bus secondary voltage bus 12 loses voltage, the first electric signal acquisition component 200 or the second electric signal acquisition component 300 cannot normally acquire a corresponding electric signal, at the moment, the microprocessor 400 judges that a line fault occurs, and cannot normally provide power for a metering instrument, a security instrument and the like, at the moment, the state switch 100 is controlled to be closed, the first section of bus secondary voltage bus 11 and the second section of bus secondary voltage bus 12 are switched to be in a parallel state, so that the metering instrument and the security instrument of a fault circuit are powered through a circuit without a fault, operation and maintenance personnel do not need to arrive at the site to be switched in a parallel/parallel state, the electric quantity loss from the circuit fault to the operation and maintenance personnel in a period of time when the operation and maintenance personnel arrive at the site is reduced, and the security instrument in the circuit can normally work in the period of time, reducing the security risk.
In an embodiment, the microprocessor 400 includes a fault determining module 410, and the fault determining module 410 is configured to generate a splitting signal or a parallel signal according to the electrical signal of the first bus secondary voltage bus 11 and the electrical signal of the second bus secondary voltage bus 12. For example, in normal operation, the electrical signal of the first bus secondary voltage bus 11 or the electrical signal of the second bus secondary voltage bus 12 is counted as a, and at this time, a may be set0If the signal is not within the normal fluctuation range, the real-time electrical signal a of the secondary voltage bus 12 is not less than the normal fluctuation range1Exceeds A0In the range, the circuit is considered to be in fault, and parallel signals are generated. The microprocessor 400 sends a parallel signal instruction, and the state switch 100 is closed after executing the instruction, so that the primary bus secondary voltage bus 11 and the secondary bus 12 are switched from the disconnected state to the parallel state. When the circuit maintenance is completed, the microprocessor 400 sends a disconnection signal instruction, and the state switch 100 is turned off after executing the instruction, so that the secondary voltage bus 11 of the first bus and the secondary voltage bus 12 of the second bus are switched from the disconnection state to the disconnection state.
Further, the microprocessor 400 further includes a short circuit reset module 430, where the short circuit reset module 430 is configured to generate a reset signal according to the electrical signal of the first segment bus secondary voltage bus or the electrical signal of the second segment bus secondary voltage bus. That is, when the first bus secondary voltage bus 11 and the second bus secondary voltage bus 12 are switched from the disconnected state to the parallel state, if the circuit fault state is the short-circuit state, the electrical signal of the first bus secondary voltage bus 11 or the electrical signal of the second bus secondary voltage bus 12 is abnormal, and at this time, the microprocessor 400 generates a reset signal to control the first bus secondary voltage bus 11 and the second bus secondary voltage bus 12 to be switched from the parallel state to the disconnected state, so as to prevent the current overload for a long time. The short circuit reset module 430 is arranged, and the fault state of the line can be judged according to the judgment result of the short circuit reset module 430, so that reference is provided for line inspection and maintenance.
In an embodiment, in order to prevent the long-time fault operation of the circuit caused by the fact that the fault cannot be timely eliminated due to the operation and maintenance personnel after the voltage paralleling device 10 capable of automatically switching the state is automatically switched, the microprocessor 400 further includes an overtime early warning module 420, where the overtime early warning module 420 is configured to obtain the fault duration of the state switch 100 in the parallel state, and send an alarm signal when the fault duration exceeds a set duration threshold.
Specifically, the timeout warning module 420 includes a timing unit 421 and a timeout determining unit 422, where the timing unit 421 is configured to obtain a fault duration of the state switch 100 in the parallel state, and the timeout determining unit 422 is configured to compare the fault duration with a set duration threshold, and send an alarm signal when the fault duration is greater than the duration threshold. For example, after the state switch 100 is turned on, the timing unit 421 starts timing, sets a timing duration to exceed 60min, and sends out an early warning signal. The timeout determining unit 422 sends an early warning signal when the timing duration exceeds 60min according to the timing duration of the timing unit 421 and the set duration threshold (60 min).
Further, the timeout warning module 420 further includes a reset unit 423, where the reset unit 423 is configured to respond to confirmation of an alarm signal by an operator, and restore the fault duration to a zero position. That is, after the timeout warning module 420 sends a warning signal once, and after the operator confirms, the reset unit 423 resets the fault time length to zero, re-times, and sends the warning signal when the timed time length exceeds the set time length threshold (60 min). The operation and maintenance personnel are prompted to carry out the inspection and maintenance operation in time, so that the circuit is prevented from operating for a long time due to artificial negligence.
In one embodiment, a power supply component is included to provide power to the microprocessor 400.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.
Claims (7)
1. A voltage paralleling device capable of automatically switching states is arranged on a section of bus secondary voltage bus and a section of bus secondary voltage bus, and is characterized by comprising a state switch, a first electric signal acquisition assembly, a second electric signal acquisition assembly and a microprocessor, wherein the input end of the first electric signal acquisition assembly is electrically connected with the section of bus secondary voltage bus, and the output end of the first electric signal acquisition assembly is connected with the signal input end of the microprocessor and is used for acquiring the electric signal of the section of bus secondary voltage bus; the input end of the second electric signal acquisition assembly is electrically connected with the secondary voltage bus of the second section of bus, and the output end of the second electric signal acquisition assembly is connected with the signal input end of the microprocessor and is used for acquiring the electric signal of the secondary voltage bus of the second section of bus; the output end of the microprocessor is connected with the state change-over switch and is used for controlling the state change-over switch to be opened or closed according to the electric signal of the secondary voltage bus of the first section of bus and the electric signal of the secondary voltage bus of the second section of bus, so that the parallel and disconnection state of the secondary voltage bus of the first section of bus and the secondary voltage bus of the second section of bus is switched.
2. The voltage paralleling apparatus capable of automatically switching states according to claim 1, wherein the microprocessor comprises a fault determining module, and the fault determining module is configured to generate a disconnection signal or a parallel signal according to an electrical signal of the first bus secondary voltage bus and an electrical signal of the second bus secondary voltage bus.
3. The voltage paralleling apparatus capable of automatically switching states as claimed in claim 2, wherein the microprocessor further comprises a short circuit reset module for generating a reset signal according to an electrical signal of the first segment bus secondary voltage bus or an electrical signal of the second segment bus secondary voltage bus.
4. The voltage paralleling device capable of automatically switching states according to claim 3, wherein the microprocessor further comprises a timeout prewarning module, the timeout prewarning module is configured to obtain a fault duration of the state switch in the parallel state, and send an alarm signal when the fault duration exceeds a set duration threshold.
5. The voltage paralleling device capable of automatically switching states according to claim 4, wherein the overtime early warning module comprises a timing unit and an overtime judging unit, the timing unit is used for acquiring the fault duration of the state switch in the parallel state, the overtime judging unit is used for comparing the fault duration with a set duration threshold, and when the fault duration is greater than the duration threshold, an alarm signal is sent out.
6. The voltage paralleling apparatus capable of automatically switching states according to claim 5, wherein the timeout warning module further comprises a reset unit for restoring the fault duration to zero in response to an operator's confirmation of an alarm signal.
7. The voltage parallelism apparatus of claim 1, further comprising a power supply assembly configured to provide power to the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120875630.9U CN215681798U (en) | 2021-04-26 | 2021-04-26 | Voltage parallel device capable of automatically switching states |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120875630.9U CN215681798U (en) | 2021-04-26 | 2021-04-26 | Voltage parallel device capable of automatically switching states |
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| CN215681798U true CN215681798U (en) | 2022-01-28 |
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| CN202120875630.9U Expired - Fee Related CN215681798U (en) | 2021-04-26 | 2021-04-26 | Voltage parallel device capable of automatically switching states |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866483B (en) * | 2021-10-20 | 2023-07-14 | 国网宁夏电力有限公司宁东供电公司 | Automatic verification method and system for secondary voltage of transformer substation |
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2021
- 2021-04-26 CN CN202120875630.9U patent/CN215681798U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866483B (en) * | 2021-10-20 | 2023-07-14 | 国网宁夏电力有限公司宁东供电公司 | Automatic verification method and system for secondary voltage of transformer substation |
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Granted publication date: 20220128 |