CN212462775U - Bus residual voltage holding device for high voltage - Google Patents
Bus residual voltage holding device for high voltage Download PDFInfo
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- CN212462775U CN212462775U CN202020791339.9U CN202020791339U CN212462775U CN 212462775 U CN212462775 U CN 212462775U CN 202020791339 U CN202020791339 U CN 202020791339U CN 212462775 U CN212462775 U CN 212462775U
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Abstract
The utility model discloses a be used for highly compressed generating line residual voltage holding device belongs to electric power system technical field, including establishing ties at the line-in-branch's rogowski coil, observing and controlling unit, transverter, current-limiting impedance device and computer protection device, current-limiting impedance device one end is connected the rogowski coil, and install cut-off switch between the two, the other end is connected the transverter, current-limiting impedance device is including the impedance resistance and the auxiliary resistance of establishing ties, wherein the auxiliary resistance with install electromagnetic switch between the impedance resistance, electromagnetic switch by observe and control the unit drive. The auxiliary resistor is used as the impedance resistor to share pressure, when the measuring and controlling unit detects that the branch current is still large under the condition that the impedance resistor is conducted, the auxiliary resistor can be conducted through the electromagnetic switch, the resistance value of the current-limiting impedance device is increased, and the bus residual voltage can be continuously maintained for a period of time on a normal voltage value.
Description
Technical Field
The utility model belongs to the technical field of electric power system, in particular to a be used for highly compressed generating line residual voltage holding device.
Background
In the current power supply system of a certain voltage class of a medium voltage power grid in a plurality of enterprises, if a branch circuit is short-circuited, the voltage on a bus connected with the branch circuit is seriously dropped suddenly, the residual voltage of the bus is generally lower than 20% of rated defined voltage, only when a branch circuit breaker is disconnected, the short-circuit fault is removed, the bus voltage can be recovered, the time of the bus voltage dropping suddenly to the recovery is the time of the disconnection and short-circuit fault of the circuit breaker, about 0.1 second, namely the time of the microcomputer comprehensive protection judgment fault (20ms-30ms), plus the inherent action time of the circuit breaker (40ms-80ms), plus the arc zero-crossing time (about 16 ms), the time of the bus voltage sinking appears, and the enterprise power supply system is called as 'electricity interference'. During the occurrence of 'power-shaking', the residual voltage of the bus is very low, so that the operation of some loads without short-circuit fault is interrupted, such as a frequency converter, a motor, a relay, an electromagnetic valve and the like, the loads which obviously react to the 'power-shaking' are called sensitive loads, the tolerable 'power-shaking' time of the sensitive loads is not more than 30ms, when the external network has short-circuit fault, all loads or part of important loads in the internal network can be switched to the other external network, but a branch circuit in the internal network can not be switched integrally but only partially, if the important sensitive loads in the internal network are manually concentrated into a few branch circuits or other branch circuits, the partial switching can solve the problem that the important loads are shut down due to the short-circuit of the internal network, the necessary condition is that a suitable external network which can be switched exists, if the important sensitive loads in the internal network are many branch circuits, the cost of partial handover is too large. Therefore, the bus residual voltage maintaining device has the function of increasing the impedance of the branch circuit with the short-circuit fault to more than 20 times of the total impedance of the external network within 20ms, and recovering and maintaining the bus residual voltage to more than 95% of the rated voltage, so that the fault has enough repairing time.
Traditional generating line residual voltage holding device adopts the unit of observing and controling to detect the branch line short circuit and opens, current-limiting impedance resistance maintains the generating line residual voltage and keeps 95% of rated voltage, but when applying on high-voltage bus circuit, single current-limiting impedance resistance is punctured by the heavy current very easily, lead to the device to break down, residual voltage holding device needs the common cooperation of a plurality of electrical components to use moreover, consequently need sealed regulator cubicle to protect, but because generating line residual voltage holding device need be connected with the branch circuit of generating line, can lead to sealed regulator cubicle to become invalid during the line connection, influence the protecting effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a be used for highly compressed generating line residual voltage holding device in order to solve above-mentioned generating line residual voltage holding device and easily appear the problem that the impedance resistance is punctured and damage and can destroy the leakproofness when the regulator cubicle is worked a telephone switchboard under high-pressure environment, have auxiliary resistance and prevent that the impedance resistance from being punctured by the heavy current, adaptation high-pressure environment work, regulator cubicle wiring convenience and the good advantage of leakproofness.
The utility model discloses a following technical scheme realizes above-mentioned purpose, a be used for highly compressed generating line residual voltage holding device, including establishing ties at the line-in-branch's rogowski coil, observing and controlling unit, transverter, current-limiting impedance device and computer protection device, current-limiting impedance device one end is connected the rogowski coil, and the installation cut-off switch between the two, the other end is connected the transverter, current-limiting impedance device is including the impedance resistance and the auxiliary resistance of establishing ties, wherein auxiliary resistance with install electromagnetic switch between the impedance resistance, electromagnetic switch by observe and control the unit drive.
Preferably, the grounding end of the converter is connected with the ground wire through a series current transformer.
Preferably, the electrical components inside the bus residual voltage holding device are all installed inside the electrical cabinet, and a cabinet door is hinged to the electrical cabinet.
Preferably, the interior of the electrical cabinet is at least divided into an upper electrical installation area and a lower electrical installation area, and a wire passing hole is arranged between two adjacent electrical installation areas.
Preferably, the sealed threading mechanism of electrical cabinet side wall installation includes outer retainer plate, installs at the inside interior spring coil of outer retainer plate and connects the rubber face of outer retainer plate and interior spring coil.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the auxiliary resistor is used as the impedance resistor to share pressure, when the measuring and controlling unit detects that the branch current is still large under the condition that the impedance resistor is conducted, the auxiliary resistor can be conducted through the electromagnetic switch, the resistance value of the current-limiting impedance device is increased, and the bus residual voltage can be continuously maintained for a period of time on a normal voltage value.
2. The bus residual voltage holding device is integrated in the electrical cabinet, operation and management are convenient, and the sealing threading mechanism on the side wall of the electrical cabinet enables the electrical cabinet to be in a sealing state when electrical components are wired with the outside, so that the electrical cabinet is not prone to being affected with damp and damaging the internal electrical components.
Drawings
Fig. 1 is a schematic diagram of the wiring structure of the bus residual voltage holding device of the present invention.
Fig. 2 is a schematic structural diagram of the current-limiting impedance device of the present invention.
Fig. 3 is a schematic view of the electrical cabinet structure of the present invention.
Fig. 4 is a schematic view of an installation region in an electrical cabinet of the present invention.
Fig. 5 is a schematic structural view of the sealing threading mechanism of the present invention.
In the figure: 1. the device comprises a rogowski coil, 2, a measurement and control unit, 3, an inverter, 4, a disconnecting switch, 5, a current-limiting impedance device, 6, a current transformer, 7, a microcomputer protection device, 8, an impedance resistor, 9, an electromagnetic switch, 10, an auxiliary resistor, 11, an electrical cabinet, 12, a cabinet door, 13, a sealing threading mechanism, 14, a threading hole, 15, an outer fixing ring, 16, an inner spring ring, 17 and a rubber surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 and fig. 2, a bus residual voltage maintaining device for high voltage includes a rogowski coil 1, a measurement and control unit 2, an inverter 3, a current limiting impedance device 5 and a microcomputer protection device 7 connected in series on a branch line, one end of the current limiting impedance device 5 is connected with the rogowski coil 1, a cut-off switch 4 is installed between the rogowski coil 1 and the rogowski coil, the other end is connected with the inverter 3, the current limiting impedance device 5 includes an impedance resistor 8 and an auxiliary resistor 10 connected in series, wherein an electromagnetic switch 9 is installed between the auxiliary resistor 10 and the impedance resistor 8, the electromagnetic switch 9 is driven by the measurement and control unit 2, the measurement and control unit 2 monitors the branch line current through the rogowski coil 1, when the monitored short-circuit current is larger than a set value, the inverter is controlled to be rapidly switched off within 2-3 milliseconds, the short-circuit, the voltage is increased and kept above 95% of rated voltage, so that the residual voltage of the bus is maintained and used for a sensitive load, the current-limiting impedance device 5 is composed of an impedance resistor 8 and an auxiliary resistor 10 which are connected in series, when the current-limiting impedance device is normally used, only the impedance resistor 8 is connected into a circuit, if the short-circuit current is too large, the auxiliary resistor 10 is conducted through an electromagnetic switch 9, so that the current pressure of the impedance resistor 8 is shared, and the phenomenon that the impedance resistor 8 is broken down by large current to influence the use of the whole device is avoided.
The grounding end of the current converter 3 is connected with the ground wire through the series current transformer 6, and the use safety of the current converter 3 is improved by connecting the ground wire.
As shown in fig. 3-5, electrical components inside the bus residual voltage holding device are all installed inside an electrical cabinet 11, a cabinet door 12 is hinged on the electrical cabinet 11, the interior of the electrical cabinet 11 is at least divided into an upper electrical installation area and a lower electrical installation area, a wire passing hole 14 is installed between two adjacent electrical installation areas, the electrical cabinet 11 plays a role of protecting the bus residual voltage holding device, the installation areas are divided into multiple layers to facilitate heat dissipation, narrow space line winding and accelerated aging are avoided, the wire passing hole 14 is used for facilitating line routing between each installation area, a sealing threading mechanism 13 is installed on the side wall of the electrical cabinet 11, and comprises an outer fixed ring 15, an inner spring ring 16 installed inside the outer fixed ring 15, and a rubber surface 17 connecting the outer fixed ring 15 and the inner spring ring 16, the outer fixed ring 15 plays a role of fixing the sealing threading mechanism 13, and the inner spring ring 16 can enlarge the aperture during wiring, the circuit is convenient to pass through, after hands are loosened, the circuit is clamped in a self-contraction mode, the rubber surface 17 fills the gap between the rubber surfaces 17 of the inner spring ring 16, and therefore the sealing performance of the electrical cabinet 11 is maintained.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A bus residual voltage maintaining device for high voltage comprises a rogowski coil (1), a measurement and control unit (2), a current converter (3), a current limiting impedance device (5) and a microcomputer protection device (7) which are connected in series on a branch line, wherein one end of the current limiting impedance device (5) is connected with the rogowski coil (1), a disconnecting switch (4) is installed between the rogowski coil and the current converter (3), the other end of the current limiting impedance device is connected with the current converter (3), the current limiting impedance device (5) comprises an impedance resistor (8) and an auxiliary resistor (10) which are connected in series, an electromagnetic switch (9) is installed between the auxiliary resistor (10) and the impedance resistor (8), and the electromagnetic switch (9) is driven by the measurement and control unit (2).
2. Bus residual voltage holding device for high voltage according to claim 1, characterized in that the ground terminal of the converter (3) is connected to ground via a series current transformer (6).
3. The busbar residual voltage maintaining device for high voltage according to claim 1, wherein the electrical components inside the busbar residual voltage maintaining device are all installed inside an electrical cabinet (11), and a cabinet door (12) is hinged on the electrical cabinet (11).
4. The bus residual voltage maintaining device for high voltage according to claim 3, wherein the electrical cabinet (11) is divided into at least two electrical installation areas, and a wire passing hole (14) is installed between two adjacent electrical installation areas.
5. The bus residual voltage maintaining device for high voltage as claimed in claim 3, wherein the side wall of the electrical cabinet (11) is provided with a sealing threading mechanism (13) which comprises an outer fixing ring (15), an inner spring ring (16) arranged inside the outer fixing ring (15) and a rubber surface (17) connecting the outer fixing ring (15) and the inner spring ring (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020791339.9U CN212462775U (en) | 2020-05-13 | 2020-05-13 | Bus residual voltage holding device for high voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020791339.9U CN212462775U (en) | 2020-05-13 | 2020-05-13 | Bus residual voltage holding device for high voltage |
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| CN212462775U true CN212462775U (en) | 2021-02-02 |
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| CN202020791339.9U Active CN212462775U (en) | 2020-05-13 | 2020-05-13 | Bus residual voltage holding device for high voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389249A (en) * | 2022-01-17 | 2022-04-22 | 苏州达晶微电子有限公司 | Low residual voltage protection device |
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2020
- 2020-05-13 CN CN202020791339.9U patent/CN212462775U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389249A (en) * | 2022-01-17 | 2022-04-22 | 苏州达晶微电子有限公司 | Low residual voltage protection device |
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