CN214798851U - Three-phase alternating current phase sequence automatic switching and protecting device - Google Patents
Three-phase alternating current phase sequence automatic switching and protecting device Download PDFInfo
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- CN214798851U CN214798851U CN202121275930.XU CN202121275930U CN214798851U CN 214798851 U CN214798851 U CN 214798851U CN 202121275930 U CN202121275930 U CN 202121275930U CN 214798851 U CN214798851 U CN 214798851U
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Abstract
The utility model discloses a three-phase alternating current phase sequence automatic switch-over and protection device relates to three-phase alternating current technical field, this three-phase alternating current phase sequence automatic switch-over and protection device, include: the phase sequence identification and control signal and overvoltage and undervoltage protection module is used for identifying the phase sequence of the sampled three-phase alternating current so as to control whether the phase sequence of the phase sequence switching module is switched or not, and simultaneously protecting the circuit when the sampled three-phase alternating current is in overvoltage and undervoltage; the phase sequence switching module is used for changing the phase sequence of the input three-phase alternating current; compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses can realize high pressure, low pressure three-phase alternating current phase sequence automatic switch-over, this device can the purpose that self and follow-up equipment are protected in auto-power-off when three-phase alternating current lacks the looks simultaneously, and its simple structure is suitable for voltage range extensively moreover, still has overvoltage and under voltage protect function to this device all adopts national standard accessories, easily equipment low cost.
Description
Technical Field
The utility model relates to a three-phase alternating current technical field specifically is a three-phase alternating current phase sequence automatic switch-over and protection device.
Background
In the modern electric traction technology, three-phase alternating current is generally used, but power supply switching among different transformer substations is needed due to the fact that jumper wires or changes of power consumption in different areas need to be carried out on a high-voltage line in power grid maintenance and various engineering constructions, and therefore the phase sequence of the three-phase alternating current of an end user can be changed, and therefore the motor in a certain area rotates reversely, so that equipment runs abnormally, and even accidents happen.
Patent No. CN207398840U, to some extent, solves the problem of phase sequence change of three-phase ac, but there are three key problems in this technical solution: 1. when three-phase alternating current is in failure, the phase sequence identification control small motor of the device can be burnt, and subsequent equipment thereof is damaged and even accidents occur. 2. The used parts are non-national standard parts, are not convenient for production and assembly and can not be used universally. 3. The technical scheme can be only used in common low-voltage alternating current, has a limited application range and needs improvement.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a three-phase alternating current phase sequence automatic switch-over and protection device to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a three-phase alternating current phase sequence automatic switching and protecting device comprises:
the three-phase alternating current module is used for supplying three-phase alternating current;
the sampling module is used for sampling the three-phase alternating current;
the phase sequence identification and control signal and overvoltage and undervoltage protection module is used for identifying the phase sequence of the sampled three-phase alternating current so as to control whether the phase sequence of the phase sequence switching module is switched or not, and simultaneously protecting the circuit when the sampled three-phase alternating current is in overvoltage and undervoltage;
the phase sequence switching module is used for changing the phase sequence of the input three-phase alternating current;
the three-phase alternating current output module is used for outputting three-phase alternating current;
the three-phase alternating current module is connected with the sampling module, the sampling module is connected with the phase sequence switching module, the phase sequence identification and control signal and the over-under-voltage protection module are connected with the phase sequence switching module, and the phase sequence switching module is connected with the three-phase alternating current output module.
As a further aspect of the present invention: the sampling module comprises a transformer Z1, a transformer Z2 and a transformer Z3, wherein one end of the transformer Z1 is connected with a three-phase alternating current U, one end of the transformer Z2 is connected with a three-phase alternating current V, and one end of the transformer Z3 is connected with a three-phase alternating current W. When the three-phase high voltage is applied, the sampling module is composed of a transformer Z1, a transformer Z2 and a transformer Z3; when the three-phase low-voltage electricity is used, the sampling module is composed of an electric wire for transmitting the three-phase low-voltage electricity.
As a further aspect of the present invention: the phase sequence identification and control signal and overvoltage and undervoltage protection module comprises a fuse FU1, a fuse FU2, a fuse FU3, an interlocking relay K5, a relay K1, a relay K2, a phase sequence identifier D1 and a phase sequence identifier D2, one end of the fuse FU3 is connected with a transformer Z1, one end of the fuse FU2 is connected with a transformer Z2, one end of the fuse FU1 is connected with a transformer Z1, the other end of the fuse FU1 is connected with the third end of the phase sequence identifier D1, the first end of the phase sequence identifier D1 and the fourth end of the phase sequence identifier D1, the other end of the fuse FU1 is connected with the second end of the phase sequence identifier D1, the second end of the phase sequence identifier D1 and the second end of the interlocking relay K1, the other end of the fuse FU1 is connected with the first end of the phase sequence identifier D1, the fourth end of the phase sequence identifier D1, the third end of the phase sequence identifier D1, the interlocking relay K1 and the fifth end of the phase sequence identifier D1, the other end of the relay K2 is connected with the fourth end of the interlock relay K5, the fifth end of the phase sequence recognizer D2 is connected with the relay K1, and the other end of the relay K1 is connected with the third end of the interlock relay K5.
As a further aspect of the present invention: the phase sequence switching module comprises a power contactor J1, a power contactor J2, the other end of a transformer Z1, the first end of the power contactor J1 and the third end of the power contactor J2 are connected, the other end of a transformer Z2 is connected with the second end of the power contactor J1 and the second end of the power contactor J2, and the other end of the transformer Z3 is connected with the third end of the power contactor J1 and the first end of the power contactor J2.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses can realize high pressure, low pressure three-phase alternating current phase sequence automatic switch-over, this device can the purpose that self and follow-up equipment are protected in auto-power-off when three-phase alternating current lacks the looks simultaneously, and its simple structure is suitable for voltage range extensively moreover, still has overvoltage and under voltage protect function to this device all adopts national standard accessories, easily equipment low cost.
Drawings
Fig. 1 is a schematic diagram of an automatic phase sequence switching and protecting device for three-phase alternating current.
Fig. 2 is a first circuit diagram of an automatic phase sequence switching and protecting device for three-phase alternating current.
Fig. 3 is a second circuit diagram of an automatic phase sequence switching and protecting device for three-phase ac power.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some 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 belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1, an automatic switching and protecting device for a three-phase ac phase sequence includes:
the three-phase alternating current module is used for supplying three-phase alternating current;
the sampling module is used for sampling the three-phase alternating current;
the phase sequence identification and control signal and overvoltage and undervoltage protection module is used for identifying the phase sequence of the sampled three-phase alternating current so as to control whether the phase sequence of the phase sequence switching module is switched or not, and simultaneously protecting the circuit when the sampled three-phase alternating current is in overvoltage and undervoltage;
the phase sequence switching module is used for changing the phase sequence of the input three-phase alternating current;
the three-phase alternating current output module is used for outputting three-phase alternating current;
the three-phase alternating current module is connected with the sampling module, the sampling module is connected with the phase sequence switching module, the phase sequence identification and control signal and the over-under-voltage protection module are connected with the phase sequence switching module, and the phase sequence switching module is connected with the three-phase alternating current output module.
In this embodiment: referring to fig. 2, the sampling module includes a transformer Z1, a transformer Z2, and a transformer Z3, wherein one end of the transformer Z1 is connected to a three-phase ac current U, one end of the transformer Z2 is connected to a three-phase ac current V, and one end of the transformer Z3 is connected to a three-phase ac current W.
When the three-phase high voltage is applied, the sampling module is composed of a transformer Z1, a transformer Z2 and a transformer Z3; referring to fig. 3, in the case of a three-phase low voltage, the sampling module is formed by a wire for transmitting the three-phase low voltage, and the other modules are the same as those in the case of a three-phase high voltage, so that the apparatus can perform phase sequence switching of three-phase alternating current at both high and low voltages.
In this embodiment: referring to fig. 2, the phase sequence identification and control signal and overvoltage/undervoltage protection module includes fuse FU1, fuse FU2, fuse FU3, interlock relay K5, relay K1, relay K2, phase sequence identifier D1, phase sequence identifier D2, one end of fuse FU3 is connected to transformer Z1, one end of fuse FU2 is connected to transformer Z2, one end of fuse FU1 is connected to transformer Z1, the other end of fuse FU1 is connected to the third end of phase sequence identifier D1, the first end of phase sequence identifier D1, the fourth end of phase sequence identifier D1, the other end of fuse FU1 is connected to the second end of phase sequence identifier D1, the second end of interlock relay K1, the other end of fuse FU1 is connected to the first end of phase sequence identifier D1, the fourth end of phase sequence identifier D1, the third end of phase sequence identifier D1, the fifth end of interlock relay K1, and the fifth end of fuse FU1, the other end of the relay K2 is connected with the fourth end of the interlock relay K5, the fifth end of the phase sequence recognizer D2 is connected with the relay K1, and the other end of the relay K1 is connected with the third end of the interlock relay K5.
When the phase sequence of the input three-phase alternating current corresponds to the phase sequence, the phase sequence recognizer D1 works, and the phase sequence recognizer D2 does not work, so that the left end of the interlocking relay K5 is closed, the relay K1 works, and the power contactor J1 works; when the phase sequence of the input three-phase alternating current does not correspond to the phase sequence, the phase sequence recognizer D1 does not work, the phase sequence recognizer D2 works, the right end of the interlocking relay K5 is closed, the relay K2 works, and the power contactor J2 works.
In this embodiment: referring to fig. 2, the phase sequence switching module includes a power contactor J1, a power contactor J2, another end of a transformer Z1 connected to the first end of the power contactor J1 and the third end of the power contactor J2, another end of a transformer Z2 connected to the second end of the power contactor J1 and the second end of the power contactor J2, and another end of the transformer Z3 connected to the third end of the power contactor J1 and the first end of the power contactor J2.
When the three-phase alternating current input phase sequence corresponds to each other, the power contactor J1 works, the power contactor J2 does not work, and corresponding three-phase high-voltage alternating current is output; when the input phase sequence of the three-phase high-voltage alternating current is not corresponding, the power contactor J1 does not work, the power contactor J2 works, and the non-corresponding three-phase high-voltage alternating current is converted into the corresponding three-phase high-voltage alternating current to be output.
The utility model discloses a theory of operation is: the core part of the device uses two phase sequence identifiers D1 and D2 to identify the phase sequence of three-phase alternating current, the left end or the right end of an interlocking relay K5 is controlled to be closed through signals output by the phase sequence identifiers D1 and D2, the interlocking relay controls a power contactor J1 and a power contactor J2 to switch the phase sequence of the three-phase alternating current, the phase sequence identifiers are sampled through a mutual inductor (shown in figure 2) during high-voltage three-phase alternating current, the phase sequence identifiers are directly sampled through an electric wire (shown in figure 3) during low-voltage three-phase alternating current, and the purpose that the high-voltage three-phase alternating current and the low-voltage three-phase alternating current can be automatically switched in the phase sequence is achieved. The phase sequence recognizer can rapidly disconnect the power contactor when the power grid is abnormal, and can detect whether the voltage of the power grid is normal or not and whether the three-phase alternating current is equal to or not, so that subsequent equipment is protected.
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 (4)
1. The utility model provides a three-phase alternating current phase sequence automatic switch-over and protection device which characterized in that:
this three-phase alternating current phase sequence automatic switch-over and protection device includes:
the three-phase alternating current module is used for supplying three-phase alternating current;
the sampling module is used for sampling the three-phase alternating current;
the phase sequence identification and control signal and overvoltage and undervoltage protection module is used for identifying the phase sequence of the sampled three-phase alternating current so as to control whether the phase sequence of the phase sequence switching module is switched or not, and simultaneously protecting the circuit when the sampled three-phase alternating current is in overvoltage and undervoltage;
the phase sequence switching module is used for changing the phase sequence of the input three-phase alternating current;
the three-phase alternating current output module is used for outputting three-phase alternating current;
the three-phase alternating current module is connected with the sampling module, the sampling module is connected with the phase sequence switching module, the phase sequence identification and control signal and the over-under-voltage protection module are connected with the phase sequence switching module, and the phase sequence switching module is connected with the three-phase alternating current output module.
2. The automatic phase sequence switching and protecting device for three-phase alternating current according to claim 1, wherein the sampling module comprises a transformer Z1, a transformer Z2 and a transformer Z3, wherein one end of the transformer Z1 is connected with the three-phase alternating current U, one end of the transformer Z2 is connected with the three-phase alternating current V, and one end of the transformer Z3 is connected with the three-phase alternating current W; when the three-phase high voltage is applied, the sampling module is composed of a transformer Z1, a transformer Z2 and a transformer Z3; when the three-phase low-voltage electricity is used, the sampling module is composed of an electric wire for transmitting the three-phase low-voltage electricity.
3. The automatic switching and protecting device for the phase sequence of three-phase alternating current according to claim 1, wherein the phase sequence identification and control signal and overvoltage/undervoltage protection module comprises a fuse FU1, a fuse FU2, a fuse FU3, an interlock relay K5, a relay K1, a relay K2, a phase sequence identifier D1, a phase sequence identifier D2, one end of the fuse FU3 is connected with a transformer Z1, one end of the fuse FU2 is connected with a transformer Z2, one end of the fuse FU1 is connected with a transformer Z3, the other end of the fuse FU1 is connected with a third end of the phase sequence identifier D1, a first end of the phase sequence identifier D2, a fourth end of the phase sequence identifier D2, the other end of the fuse FU2 is connected with a second end of the phase sequence identifier D1, a second end of the phase sequence identifier D2, a second end of the interlock relay K5, and the other end of the fuse FU3 is connected with a first end of the phase sequence identifier D1 and a D1 of the phase sequence identifier D3982, The third end of phase sequence recognizer D2, the first end of interlock relay K5, the fifth end of phase sequence recognizer D1 connects relay K2, and the fourth end of interlock relay K5 is connected to the other end of relay K2, and relay K1 is connected to the fifth end of phase sequence recognizer D2, and the third end of interlock relay K5 is connected to the other end of relay K1.
4. The automatic phase sequence switching and protecting device for three-phase alternating current according to claim 2, wherein the phase sequence switching module comprises a power contactor J1, a power contactor J2, the other end of a transformer Z1 is connected with the first end of the power contactor J1 and the third end of the power contactor J2, the other end of a transformer Z2 is connected with the second end of the power contactor J1 and the second end of the power contactor J2, and the other end of the transformer Z3 is connected with the third end of the power contactor J1 and the first end of the power contactor J2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121275930.XU CN214798851U (en) | 2021-06-08 | 2021-06-08 | Three-phase alternating current phase sequence automatic switching and protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121275930.XU CN214798851U (en) | 2021-06-08 | 2021-06-08 | Three-phase alternating current phase sequence automatic switching and protecting device |
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| Publication Number | Publication Date |
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| CN214798851U true CN214798851U (en) | 2021-11-19 |
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| CN202121275930.XU Active CN214798851U (en) | 2021-06-08 | 2021-06-08 | Three-phase alternating current phase sequence automatic switching and protecting device |
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| CN (1) | CN214798851U (en) |
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- 2021-06-08 CN CN202121275930.XU patent/CN214798851U/en active Active
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