CN111276936A - Three-phase under-voltage protection method - Google Patents
Three-phase under-voltage protection method Download PDFInfo
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- CN111276936A CN111276936A CN202010143941.6A CN202010143941A CN111276936A CN 111276936 A CN111276936 A CN 111276936A CN 202010143941 A CN202010143941 A CN 202010143941A CN 111276936 A CN111276936 A CN 111276936A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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Abstract
The invention discloses a three-phase undervoltage protection method, which is characterized in that at least three undervoltage relays are connected in a three-phase circuit, normally open contacts of the undervoltage relays are connected in series with an undervoltage release in the three-phase circuit, the undervoltage release adopts control power supply voltage, and a mechanical linkage mechanism of the undervoltage release is connected in a circuit breaker.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a three-phase undervoltage protection method.
Background
At present, when a circuit breaker is provided with an undervoltage release, the circuit breaker has undervoltage protection. After the circuit breaker is provided with the under-voltage tripping device, a coil of the under-voltage tripping device is connected with the inter-phase voltage through a button and a linkage contact, when the voltage of a power grid is reduced to a certain specified value, the suction force of an electromagnet of the under-voltage tripping device is reduced, and a lever of the under-voltage tripping device releases or acts on a tripping mechanism through rotation to break the circuit breaker, so that equipment is protected under voltage. With the continuous development of the existing equipment to intellectualization, the undervoltage protection plays an increasingly important role for the used equipment, in a power grid system, the undervoltage protection is mainly single-phase (AC230V) protection or line voltage (AC400V) protection at present, a user usually adopts AC230V undervoltage protection, an undervoltage release is directly connected to a circuit breaker incoming line A, N phase, and then B, N and C, N phases have no undervoltage protection actually, namely, the undervoltage protection function is not provided for single-phase load equipment led from B, N or C, N at the back; in the conventional AC400V undervoltage protection, the undervoltage release is generally directly connected to the circuit breaker incoming line a phase and C phase, so A, B and B, C have no undervoltage protection. Therefore, how to realize three-phase undervoltage protection is very necessary.
Disclosure of Invention
In view of this, the present invention provides a three-phase under-voltage protection method, which can perform under-voltage protection on three phases at the same time.
Based on the above purpose, the invention provides a three-phase under-voltage protection method, which comprises the following steps:
at least three undervoltage relays are connected to the three-phase circuit, and the three undervoltage relays are respectively connected to each phase circuit:
normally open contacts of three undervoltage relays are connected in series to an undervoltage release in a three-phase circuit, and the undervoltage release adopts control power supply voltage;
the mechanical linkage mechanism of the undervoltage release is connected in the circuit breaker.
Preferably, when the three-phase circuit is a 230V three-phase alternating-current circuit, the three under-voltage relays are respectively connected to three-phase line inlet ends of the circuit breaker in the circuit, and normally open contacts of the three under-voltage relays are sequentially connected in series to the under-voltage release, so that when the circuit breaker is at normal working voltage, coils of the three under-voltage relays are electrified, the normally open contacts are closed and switched on, the under-voltage release is normally closed, and the circuit breaker can be normally closed and separated;
under the condition of any phase or multiple phases of under-voltage in the circuit, at least one coil in the three under-voltage relays loses electricity, so that at least one normally-open contact in the three under-voltage relays is disconnected, a control power supply of the under-voltage release is disconnected, and the under-voltage release acts to open the circuit breaker.
Preferably, when the three-phase circuit is a 400V three-phase alternating current circuit, the three undervoltage relays are respectively connected to three-phase line inlet ends of circuit breakers in the circuit, and normally open contacts of the three undervoltage relays are sequentially connected in series to the undervoltage tripper, so that when the circuit breaker is in normal working voltage, coils of the three undervoltage relays are electrified, the normally open contacts are closed and switched on, the undervoltage tripper is normally attracted, and the circuit breaker can be normally closed and separated;
under the condition of any phase or multiple phases of under-voltage in the circuit, at least one coil in the three under-voltage relays loses electricity, so that at least one normally-open contact in the three under-voltage relays is disconnected, a control power supply of the under-voltage release is disconnected, and the under-voltage release acts to open the circuit breaker.
From the above, the three-phase undervoltage protection method provided by the invention has the advantages that at least three undervoltage relays are connected in a three-phase circuit, the normally open contacts of the undervoltage relays are connected in series with the undervoltage tripper in the three-phase circuit, the undervoltage tripper adopts control power supply voltage, and the mechanical linkage mechanism of the undervoltage tripper is connected in the circuit breaker.
Drawings
FIG. 1 is a schematic flow chart of a three-phase under-voltage protection method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art undervoltage trip AC230V and AC400V wiring method;
FIG. 3 is a schematic wiring diagram of the AC230V under-voltage protection method according to the embodiment of the present invention;
fig. 4 is a wiring diagram of the AC400V under-voltage protection method according to the embodiment of the invention.
Wherein, KM1, KM2 and KM3 are AC230V under-voltage relays, KM4, KM5 and KM6 are AC400V under-voltage relays, QT1 is AC230V under-voltage release, and QT2 is AC400V under-voltage release.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
A three-phase under-voltage protection method comprises the following steps:
at least three undervoltage relays are connected to the three-phase circuit, and the three undervoltage relays are respectively connected to each phase circuit;
three undervoltage relays respectively detect each phase voltage;
normally open contacts of three undervoltage relays are connected in series to an undervoltage release in a three-phase circuit, and the undervoltage release adopts control power supply voltage;
the control power supply voltage adopted by the undervoltage release means that a loop of the undervoltage release is provided with a special power supply.
The mechanical linkage mechanism of the undervoltage release is connected in the circuit breaker;
the connecting method of the mechanical linkage mechanism is not obviously different from the prior art.
The method is characterized in that at least three undervoltage relays are connected into a three-phase circuit, normally open contacts of the undervoltage relays are connected in series with an undervoltage release in the three-phase circuit, the undervoltage release adopts control power supply voltage, a mechanical linkage mechanism of the undervoltage release is connected into a circuit breaker, when the voltage of a power grid is normal, a coil of the undervoltage relay is electrified, normally open contacts of the undervoltage relays are closed and connected, the undervoltage release is normally attracted, the circuit breaker can be normally closed and separated, when any one-phase or multi-phase undervoltage condition occurs in the circuit, at least one undervoltage relay is electrified, the normally open contacts are disconnected, the undervoltage release acts, and the circuit breaker is separated.
As an implementation mode, when the three-phase circuit is a 230V three-phase alternating-current circuit, as shown in fig. 3, three AC230V undervoltage relays KM1, KM2 and KM3 coils are respectively connected to three-phase incoming line terminals uman, Ubn and Ucn of a circuit breaker in the circuit, and normally open contacts of the three undervoltage relays are sequentially connected in series to an undervoltage release QT1, so that when the circuit breaker is at normal operating voltage, the coils of the three undervoltage relays KM1, KM2 and KM3 are energized, the normally open contacts are all closed and switched on, the undervoltage release QT1 is normally attracted, and the circuit breaker can be normally closed and opened;
under-voltage conditions of any phase or multiple phases in the circuit, at least one coil in the three under-voltage relays loses power, so that at least one normally-open contact in the three under-voltage relays KM1, KM2 and KM3 is disconnected, a control power supply Us of an under-voltage release QT1 is disconnected, and the under-voltage release QT1 acts to open the circuit breaker.
As an implementation mode, when the three-phase circuit is a 400V three-phase AC circuit, as shown in fig. 4, three AC400V undervoltage relays KM4, KM5 and KM6 are respectively connected to three-phase incoming line terminals Uab, Ubc and Uac of a circuit breaker in the circuit, and normally open contacts of the three undervoltage relays are sequentially connected in series to an undervoltage release QT2, so that when the circuit breaker is in normal operating voltage, coils of the three undervoltage relays KM4, KM5 and KM6 are energized, normally open contacts of the three undervoltage relays are all closed and switched on, the QT2 is normally attracted and normally closed, and the circuit breaker can be normally closed and opened;
under the condition of any phase or multiple phases of under-voltage in the circuit, at least one coil in the three under-voltage relays KM4, KM5 and KM6 loses power, so that at least one normally open contact in the three under-voltage relays KM4, KM5 and KM6 is disconnected, a control power supply Us of an under-voltage release QT2 is disconnected, and the under-voltage release QT2 acts to open the breaker.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A three-phase undervoltage protection method is characterized by comprising the following steps:
at least three undervoltage relays are connected to the three-phase circuit, and the three undervoltage relays are respectively connected to each phase circuit:
normally open contacts of three undervoltage relays are connected in series to an undervoltage release in a three-phase circuit, and the undervoltage release adopts control power supply voltage;
and connecting the mechanical linkage mechanism of the undervoltage release in the circuit breaker.
2. The three-phase under-voltage protection method according to claim 1, wherein when the three-phase circuit is a 230V three-phase ac circuit, three under-voltage relays are respectively connected to three-phase line inlet terminals of a circuit breaker in the circuit, and normally open contacts of the three under-voltage relays are sequentially connected in series to an under-voltage release, so that when the circuit breaker is in a normal operating voltage, coils of the three under-voltage relays are energized, the normally open contacts are all closed and connected, the under-voltage release is normally closed, and the circuit breaker can be normally closed and opened;
under the condition of any phase or multiple phases of under-voltage in the circuit, at least one coil in the three under-voltage relays loses electricity, so that at least one normally-open contact in the three under-voltage relays is disconnected, a control power supply of the under-voltage release is disconnected, and the under-voltage release acts to open the circuit breaker.
3. The three-phase under-voltage protection method according to claim 1, wherein when the three-phase circuit is a 400V three-phase ac circuit, three under-voltage relays are respectively connected to three-phase line inlet terminals of a circuit breaker in the circuit, and normally open contacts of the three under-voltage relays are sequentially connected in series to an under-voltage release, so that when the circuit breaker is in normal operating voltage, coils of the three under-voltage relays are energized, the normally open contacts are all closed and connected, the under-voltage release is normally closed, and the circuit breaker can be normally closed and opened;
under the condition of any phase or multiple phases of under-voltage in the circuit, at least one coil in the three under-voltage relays loses electricity, so that at least one normally-open contact in the three under-voltage relays is disconnected, a control power supply of the under-voltage release is disconnected, and the under-voltage release acts to open the circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010143941.6A CN111276936A (en) | 2020-03-04 | 2020-03-04 | Three-phase under-voltage protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010143941.6A CN111276936A (en) | 2020-03-04 | 2020-03-04 | Three-phase under-voltage protection method |
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| Publication Number | Publication Date |
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| CN111276936A true CN111276936A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010143941.6A Pending CN111276936A (en) | 2020-03-04 | 2020-03-04 | Three-phase under-voltage protection method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113386Y (en) * | 2007-09-07 | 2008-09-10 | 潘凡鹏 | Full-automatic open-phase protection time-delay closing device |
| CN104092207A (en) * | 2014-07-18 | 2014-10-08 | 尤田柱 | Back voltage automatic locking controller |
| CN207664593U (en) * | 2018-01-16 | 2018-07-27 | 谭晋升 | Power distribution system voltage comprehensive protector |
-
2020
- 2020-03-04 CN CN202010143941.6A patent/CN111276936A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113386Y (en) * | 2007-09-07 | 2008-09-10 | 潘凡鹏 | Full-automatic open-phase protection time-delay closing device |
| CN104092207A (en) * | 2014-07-18 | 2014-10-08 | 尤田柱 | Back voltage automatic locking controller |
| CN207664593U (en) * | 2018-01-16 | 2018-07-27 | 谭晋升 | Power distribution system voltage comprehensive protector |
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Application publication date: 20200612 |
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| RJ01 | Rejection of invention patent application after publication |