CN217216091U - Power supply device for control power supply of low-voltage frequency converter - Google Patents
Power supply device for control power supply of low-voltage frequency converter Download PDFInfo
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- CN217216091U CN217216091U CN202220617350.2U CN202220617350U CN217216091U CN 217216091 U CN217216091 U CN 217216091U CN 202220617350 U CN202220617350 U CN 202220617350U CN 217216091 U CN217216091 U CN 217216091U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model provides a power supply device and method for controlling a power supply by a low-voltage frequency converter, which comprises the low-voltage frequency converter, a UPS power supply, a power supply and an intermediate relay; the low-voltage inverter is connected with a power supply through a power control power supply loop, a UPS control power supply loop connected with a UPS power supply is connected with the power control power supply loop in parallel, an intermediate relay is connected with the power control power supply loop and connected with the UPS control power supply loop respectively, and the intermediate relay is used for switching a power supply of the low-voltage inverter control loop, so that the low-voltage inverter normally outputs, and the problem that equipment is tripped due to output interruption of the low-voltage inverter is solved.
Description
Technical Field
The utility model relates to a power supply technical field specifically is a low-voltage inverter control power supply unit.
Background
The control power supply of the low-voltage frequency converter of the thermal power plant is generally taken from a power loop 380V certain-phase power supply such as an A-phase power supply. The main controller controls the power output of the frequency converter, and a relevant control loop is shown in figure 1.
The inverter power source is typically taken from the 380V Power Center (PC) section or the Motor Control Center (MCC) section of the power plant. When the power system operates normally, the voltage of the PC section or the MCC section is normal, and the main controller of the frequency converter works normally. When the power system breaks down, the voltage of the PC section or the MCC section of the power plant drops, and the frequency converter is damaged. Firstly, the main controller supply voltage AN drops, the output of the frequency converter cannot be normally controlled, the output of the frequency converter is interrupted, and the carried equipment trips.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a low-voltage inverter control power supply scheme solves because system's trouble supply voltage descends and leads to converter work malfunction, arouses that the converter does not have the output tripping operation problem.
The utility model discloses a realize through following technical scheme:
the utility model provides a low-voltage inverter control power supply unit, includes the low-voltage inverter to and the power control power supply return circuit that low-voltage inverter and power supply are connected, still include one with the power control power supply return circuit is parallelly connected, and the UPS control power supply return circuit of being connected with the UPS power, one connects on the power control power supply return circuit to carry out the auxiliary relay that low-voltage inverter control circuit power supply switched between power control power supply return circuit and UPS control power supply return circuit.
Preferably, the normally open contact of the intermediate relay ZJ is connected with ZJ1 and is connected with the A phase of the power control power supply loop, the normally open contact is connected with ZJ2 and is connected with the N phase of the UPS control power supply loop, the normally closed contact is connected with ZJ3 and is connected with the U phase of the power control power supply loop, and the normally closed contact is connected with ZJ4 and is connected with the N phase of the UPS control power supply loop N And (4) phase.
Preferably, the power supply is a PC or MCC segment power supply.
Preferably, the voltage of the power supply is 380V.
Preferably, the intermediate relay ZJ is a quick-acting relay.
Preferably, the UPS power source is an ac uninterruptible power supply.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a pair of low-voltage inverter control power supply unit, adopt power supply and UPS power to provide control power to low-voltage inverter, the control power that carries out low-voltage inverter through auxiliary relay switches, when electric power system breaks down, the supply voltage of converter main control unit descends, auxiliary relay switches the control power of converter to the UPS power, provide control power to low-voltage inverter by the UPS power, make the converter normally export, the problem that converter output interruption leads to the equipment tripping operation has been solved.
Drawings
FIG. 1 is a control loop of a conventional master controller controlling power output of a frequency converter;
fig. 2 is an electrical schematic diagram of the power supply method for controlling the power supply of the low-voltage inverter of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
A low-voltage frequency converter control power supply method, when the electric power system operates normally, the power supply provides the control power for low-voltage frequency converter;
when the power system breaks down, the intermediate relay performs power supply switching, and the UPS provides a control power supply for the low-voltage frequency converter, so that the output of the frequency converter is not interrupted, and the carried equipment does not trip.
When the power system fault disappears, the intermediate relay switches the power supply again, the power supply provides a control power supply for the low-voltage frequency converter, and the UPS power supply is cut off at the same time.
The power supply is a 380V power supply provided by a power center section or a Motor Control Center (MCC) section of a power plant.
The power supply method for the low-voltage frequency converter control power supply adopts the power supply and the UPS power supply to provide the control power supply for the low-voltage frequency converter, the control power supply switching of the low-voltage frequency converter is carried out through the intermediate relay, when the power system breaks down, the power supply voltage of the main controller of the frequency converter is reduced, the intermediate relay switches the control power supply of the frequency converter to the UPS power supply, the control power supply is provided for the low-voltage frequency converter through the UPS power supply, the frequency converter is enabled to normally output, and the problem that equipment trips due to the interruption of the output of the frequency converter is solved.
Example 2
Fig. 1 is the utility model provides a low-voltage inverter control power supply unit, including low-voltage inverter, UPS power, power supply and auxiliary relay, the UPS power is connected to the UPS power.
The low-voltage frequency converter is connected with a power supply through a power control power supply loop, a UPS control power supply loop connected with the UPS power supply is connected with the power control power supply loop in parallel, an intermediate relay is connected with the power control power supply loop and the UPS control power supply loop respectively, and the intermediate relay is used for switching a power supply of the low-voltage frequency converter control loop.
The normally open contact of the intermediate relay ZJ is connected with ZJ1 and the A phase of the power control power supply circuit, the normally open contact is connected with ZJ2 and the N phase of the UPS control power supply circuit, the normally closed contact is connected with ZJ3 and the U phase of the power control power supply circuit, the normally closed contact is connected with ZJ4 and the N phase of the UPS control power supply circuit N And (4) phase(s).
Preferably, the power supply is a PC section or an MCC section, and the voltage is 380V.
The intermediate relay ZJ is preferably a quick-acting relay, and the return voltage thereof, namely the demagnetization voltage of the ZJ, can be adjusted to be basically consistent with the low voltage fixed value of the frequency converter, and is generally about 50 percent of the rated voltage of the power supply.
The working principle of the power supply device for the low-voltage frequency converter control power supply is as follows:
when the power system normally operates, the voltage of the power supply is normal, the power supply voltage AN of the low-voltage frequency converter main controller is normal, the intermediate relay ZJ performs excitation action, the normally open contacts ZJ1 and ZJ2 are switched on, the normally closed contacts ZJ3 and ZJ4 are switched off, and the frequency converter main controller is powered by the power supply.
When the power system fails, the voltage of the power supply is reduced, the power supply voltage AN of the main controller of the low-voltage frequency converter is reduced, the intermediate relay ZJ is demagnetized and returns, the normally open contacts ZJ1 and ZJ2 are disconnected, the normally closed contacts ZJ3 and ZJ4 are switched on, and the control power supply of the frequency converter is switched on by UN N The uninterrupted power supply supplies power, the output of the frequency converter is not interrupted, and the equipment does not trip.
When the power system fault disappears, the voltage of the power supply is recovered, the intermediate relay ZJ is excited again to act, the normally open contacts ZJ1 and ZJ2 are switched on, the normally closed contacts ZJ3 and ZJ4 are switched off, and the main controller of the frequency converter is automatically switched back to the power supply mode.
It should be noted that, because of the action of the intermediate relay ZJ, the power supply of the main controller of the frequency converter is automatically switched from the power supply AN to the UPS power supply UNN to supply power and restore the system voltage, and when the power supply of the main controller of the frequency converter is switched back from the UPS power supply UNN to the power supply AN, the problem of parallel connection of two power supplies exists in a short time, and phase checking needs to be performed on site.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (6)
1. The utility model provides a low-voltage inverter control power supply unit, includes the low-voltage inverter, and it is connected with power supply through power control power supply return circuit, its characterized in that still include one with power control power supply return circuit is parallelly connected, and the UPS control power supply return circuit of being connected with the UPS power, one connects on power control power supply return circuit to carry out the auxiliary relay that low-voltage inverter control circuit power supply switched between power control power supply return circuit and UPS control power supply return circuit.
2. The power supply device as claimed in claim 1, wherein the normally open contact ZJ1 of the intermediate relay ZJ is connected to phase A of the power control power supply loop, the normally open contact ZJ2 is connected to phase N of the UPS control power supply loop, the normally closed contact ZJ3 is connected to phase U of the power control power supply loop, and the normally closed contact ZJ4 is connected to phase N of the UPS control power supply loop N And (4) phase(s).
3. The apparatus as claimed in claim 1, wherein the power supply is a PC-segment power supply or an MCC-segment power supply.
4. The power supply device of the low-voltage inverter control power supply of claim 1, wherein the voltage of the power supply is 380V.
5. The power supply device of the low-voltage inverter control power supply according to claim 1, wherein the intermediate relay ZJ is a fast acting relay.
6. The apparatus as claimed in claim 1, wherein the UPS power supply is an ac uninterruptible power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220617350.2U CN217216091U (en) | 2022-03-21 | 2022-03-21 | Power supply device for control power supply of low-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220617350.2U CN217216091U (en) | 2022-03-21 | 2022-03-21 | Power supply device for control power supply of low-voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217216091U true CN217216091U (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220617350.2U Active CN217216091U (en) | 2022-03-21 | 2022-03-21 | Power supply device for control power supply of low-voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217216091U (en) |
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2022
- 2022-03-21 CN CN202220617350.2U patent/CN217216091U/en active Active
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