CN208522450U - Ground protection circuit and motor power supply system - Google Patents
Ground protection circuit and motor power supply system Download PDFInfo
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- CN208522450U CN208522450U CN201821249061.1U CN201821249061U CN208522450U CN 208522450 U CN208522450 U CN 208522450U CN 201821249061 U CN201821249061 U CN 201821249061U CN 208522450 U CN208522450 U CN 208522450U
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- power supply
- string
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- 238000001514 detection method Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model provides ground protection circuit and motor power supply system; wherein; ground protection circuit includes current detection circuit, breaker control circuit and/or contactor control loop; string is equipped with the secondary side and overcurrent relay coil of current transformer in current detection circuit, and the primary side of current transformer is located at the three-phase tie point of motor current supply circuit for going here and there to detect zero-sequence current；String is equipped with overcurrent relay normally opened contact and breaker shunt opening trip coil in breaker control circuit；String is equipped with contactor normally opened contact, overcurrent relay normally-closed contact and contactor coil in contactor control loop.The utility model flexible design is simple and practical, not only plays protective effect to electrical equipment upon the occurrence of a ground fault, but also also ensures the personal safety of operator, avoids the generation of safety accident, ensure that the normal operation of distribution system.
Description
Technical field
The utility model belongs to electrical technology field, in particular to ground protection circuit and motor power supply system.
Background technique
Motor has penetrated into all trades and professions as a kind of driving machinery, its use, is industry, agricultural, national defense construction
The important guarantee being normally carried out with people's lives, with the high speed development of modern electronic technology, various motor protecting devices are answered
It transports and gives birth to, it is high sensitivity, cheap, strong operability, easy to maintain, before current every field has a wide range of applications
Scape.Therefore, the design studies for reinforcing motor protecting device are an important topics of current era.
Traditional motor protection mainly by installed in the current supply circuit of motor it is single be controlled by the controller connect
Tentaculum, when a failure occurs, control contactor disjunction are realized and are protected to disconnect the current supply circuit of motor, but the program
Defencive function it is single.When being overhauled not in time with electric line, when the reasons such as bad environments cause distribution system that ground fault occurs,
Very big electric current can be generated, since electric current is excessive at this time, may result in contactor can not normal disjunction, cannot cut off and match in time
Electrical circuit power supply will cause the electric shock accidents of the damage and service personnel of electrical equipment.
Utility model content
The purpose of this utility model is to provide ground protection circuit and motor power supply systems, for solving in the prior art
When distribution system earth current excessive the problem of causing safety accident.
To achieve the above object, the utility model provides a kind of ground protection circuit, including current detection circuit, open circuit
Device control loop and/or contactor control loop, string is equipped with the secondary side and mistake of current transformer in the current detection circuit
The primary side of current relay coil, the current transformer is located at the three-phase tie point of motor current supply circuit for going here and there to detect
Zero-sequence current；String is equipped with overcurrent relay normally opened contact and breaker shunt opening trip coil in the breaker control circuit；Institute
It states string in contactor control loop and is equipped with contactor normally opened contact, overcurrent relay normally-closed contact and contactor coil.
In order to facilitate the conducting of control contactor control loop, the contactor control loop, which is also gone here and there, is equipped with normally opened manually press
Button, the contactor normally opened contact are connected in parallel with the normally opened button manually.
It is described to connect in order to break down in contactor control loop or whens other situations turns off contactor control loop in time
Also string is equipped with manual normally closed button in tentaculum control loop, the normally closed button manually and the contactor normally opened contact, manually
The input terminal connection of normally opened button being connected in parallel a little.
The utility model additionally provides a kind of motor power supply system, including motor current supply circuit, further includes ground protection electricity
Road, the ground protection circuit include current detection circuit, breaker control circuit and/or contactor control loop, the electricity
Flow secondary side and overcurrent relay coil that string in measure loop is equipped with current transformer, the primary side string of the current transformer
It is located at the three-phase tie point of motor current supply circuit to detect zero-sequence current；In the breaker control circuit string be equipped with overcurrent after
Electric appliance normally opened contact and breaker shunt opening trip coil；String is equipped with contactor normally opened contact, mistake in the contactor control loop
Current relay normally-closed contact and contactor coil.
In order to which control selections disconnect breaker disconnection or contactor, the motor current supply circuit includes the first of parallel connection
It powers branch and the second power supply branch, string is equipped with breaker in the first power supply branch, goes here and there and sets in the second power supply branch
There is contactor, the first power supply branch is connect with the second power supply branch by change-over switch.
In order to facilitate the conducting of control contactor control loop, the contactor control loop, which is also gone here and there, is equipped with normally opened manually press
Button, the contactor normally opened contact are connected in parallel with the normally opened button manually.
It is described to connect in order to break down in contactor control loop or whens other situations turns off contactor control loop in time
Also string is equipped with manual normally closed button in tentaculum control loop, the normally closed button manually and the contactor normally opened contact, manually
The input terminal connection of normally opened button being connected in parallel a little.
The beneficial effects of the utility model are:
The ground protection circuit of the utility model includes current detection circuit, breaker control circuit and/or contactor control
Circuit processed, string is equipped with the secondary side and overcurrent relay coil of current transformer in current detection circuit；Breaker control circuit
Middle string is equipped with overcurrent relay normally opened contact and breaker shunt opening trip coil；It is normal to be equipped with contactor for string in contactor control loop
Contact, overcurrent relay normally-closed contact and contactor coil are opened, overcurrent relay coil is for the electricity in motor current supply circuit
Electrification when stream reaches setting value, further to control cut-off breaker and/or contactor.The utility model flexible design is simply real
With, protective effect not only is played to electrical equipment upon the occurrence of a ground fault, but also also ensure operator the person peace
Entirely, the generation for avoiding safety accident ensure that the normal operation of distribution system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the motor current supply circuit of the utility model；
Fig. 2 is overcurrent relay wiring diagram；
Fig. 3 is overcurrent relay internal structure chart；
Fig. 4 is breaker shunt opening coil control loop structural schematic diagram；
Fig. 5 is contactor control loop structural schematic diagram.
Specific embodiment
Specific embodiment of the present utility model is further described with reference to the accompanying drawing:
The utility model provides a kind of motor power supply system, including motor current supply circuit, further includes ground protection circuit,
Ground protection circuit can be applicable in other electrical equipments such as motor.Ground protection circuit includes current detection circuit, breaker
Control loop and/or contactor control loop, string is equipped with the secondary side and overcurrent relay of current transformer in current detection circuit
Device coil, the primary side string of current transformer are located at the three-phase tie point of motor current supply circuit to detect zero-sequence current；Open circuit
String is equipped with overcurrent relay normally opened contact and breaker shunt opening trip coil in device control loop；String is set in contactor control loop
There are contactor normally opened contact, overcurrent relay normally-closed contact and contactor coil.
Breaker and contactor in motor current supply circuit can be it is concatenated, as other embodiments, motor power supply
Circuit includes the first power supply branch and the second power supply branch in parallel, and string is equipped with breaker, the second power supply in the first power supply branch
String is equipped with contactor in branch, is connected between the first power supply branch and the second power supply branch by change-over switch.
When ground fault occurs for system, current transformer can detect zero-sequence current, when zero-sequence current reaches setting value,
Overcurrent relay normally opened contact closure, the electrification of breaker shunt opening trip coil, breaker disconnect；Alternatively, overcurrent relay is normally closed
Contact disconnects, contactor coil power loss, and contactor disconnects.But by the first power supply branch and contactor institute where breaker
The second power supply branch between be provided with change-over switch, so, can according to need selection and still broken by cut-off breaker
Open contactor make motor current supply circuit power off or simultaneously switch off several contactors of breaker make motor current supply circuit power off.
The contactor control loop of the present embodiment further includes contactor normally opened contact and normally opened button, contactor are normally opened manually
Contact is connected in parallel with manual normally opened button；Also string is equipped with manual normally closed button in the control loop, manual normally closed button with connect
The input terminal connection of tentaculum normally opened contact, manually normally opened button being connected in parallel a little.
Illustrate below with breaker and contactor are concatenated relationship, specific as depicted in figs. 1 and 2, motor power supply
Circuit includes circuit breaker Q F, contactor KM, electrothermal relay KH, further include string be located at motor D current supply circuit three-phase (U phase, V phase,
W phase) zero sequence current mutual inductor 1LH at tie point primary side, the two of overcurrent relay DLJ and zero sequence current mutual inductor 1LH
Secondary side connects to form current detection circuit, to detect the zero-sequence current in motor current supply circuit.The internal structure of overcurrent relay
As shown in figure 3, contact 1,3 is the normally opened contact of overcurrent relay DLJ, contact 5,7 is the normally-closed contact of overcurrent relay DLJ,
Contact 2,6 and contact 4,8 respectively constitute the Inside coil of overcurrent relay DLJ, are set by the series connection and parallel connection of Inside coil
Determine the action current of overcurrent relay.
As shown in figure 4, the motor ground protection circuit of the present embodiment includes breaker control circuit, breaker control circuit
In successively string be equipped with electrothermal relay FU, overcurrent relay DLJ normally opened contact and circuit breaker Q F shunt opening trip coil.When being grounded
When failure, zero sequence current mutual inductor can generate a zero-sequence current, when zero-sequence current is more than overcurrent relay setting value, overcurrent after
Electric apparatus coil electrification, then overcurrent relay normally opened contact 1,3 is closed, and breaker control circuit conducting makes point of circuit breaker Q F
It encourages tripping coil and obtains electric, drive the shunt release of breaker to act, disconnect the current supply circuit of motor, ensure that electrical equipment
And the safety of operator.
Further, the motor ground protection circuit of the present embodiment further includes contactor control loop, as shown in figure 5, should
Successively string is normally closed equipped with switch QA1, manual normally closed button SBT, manual normally opened button SBH, overcurrent relay DLJ in control loop
The coil of contact and contactor KM, the manual normally opened both ends button SBH are parallel with the normally opened contact of contactor KM.When generation ground connection event
When barrier, zero sequence current mutual inductor can generate a zero-sequence current, when zero-sequence current is more than overcurrent relay setting value, overcurrent relay
The electrification of device coil, then overcurrent relay normally-closed contact 5,7 disconnects, the contactor coil power loss in contactor control loop, right
Contacts of contactor in the motor current supply circuit answered disconnects, and disconnects the current supply circuit of motor, ensure that electrical equipment and operation
The safety of personnel.
Specific embodiment is presented above, but the utility model is not limited to embodiment described above.This
The basic ideas of utility model are above-mentioned basic scheme, for those of ordinary skill in the art, according to the present utility model
Introduction, the model, formula, parameter for designing various modifications do not need to spend creative work.The utility model is not being departed from
Principle and spirit in the case where the guarantor of the utility model is still fallen within to variation, modification, replacement and the deformation that embodiment carries out
It protects in range.
Claims (7)
1. a kind of ground protection circuit, which is characterized in that including current detection circuit, breaker control circuit and/or contactor
Control loop, string is equipped with the secondary side and overcurrent relay coil of current transformer, the electric current in the current detection circuit
The primary side of mutual inductor is located at the three-phase tie point of motor current supply circuit for going here and there to detect zero-sequence current；The breaker control
String is equipped with overcurrent relay normally opened contact and breaker shunt opening trip coil in circuit processed；It goes here and there and sets in the contactor control loop
There are contactor normally opened contact, overcurrent relay normally-closed contact and contactor coil.
2. ground protection circuit according to claim 1, which is characterized in that the contactor control loop, which is also gone here and there, is equipped with hand
Normally opened button is moved, the contactor normally opened contact is connected in parallel with the normally opened button manually.
3. ground protection circuit according to claim 1 or 2, which is characterized in that also gone here and there in the contactor control loop
Equipped with manual normally closed button, the normally closed button manually and the contactor normally opened contact, manual normally opened button are connected in parallel
The input terminal connection of point.
4. a kind of motor power supply system, including motor current supply circuit, which is characterized in that it further include ground protection circuit, it is described to connect
It includes current detection circuit, breaker control circuit and/or contactor control loop, the current detection circuit that circuit is protected on ground
Middle string is equipped with the secondary side and overcurrent relay coil of current transformer, and the primary side string of the current transformer is located at motor confession
To detect zero-sequence current at the three-phase tie point of electrical circuit；String is equipped with the normally opened touching of overcurrent relay in the breaker control circuit
Point and breaker shunt opening trip coil；It is normal to be equipped with contactor normally opened contact, overcurrent relay for string in the contactor control loop
Closed contact and contactor coil.
5. motor power supply system according to claim 4, which is characterized in that the motor current supply circuit includes in parallel the
One power supply branch and second power supply branch, it is described first power supply branch in string be equipped with breaker, it is described second power supply branch in go here and there
Equipped with contactor, the first power supply branch is connect with the second power supply branch by change-over switch.
6. motor power supply system according to claim 4 or 5, which is characterized in that the contactor control loop, which is also gone here and there, to be set
There is manual normally opened button, the contactor normally opened contact is connected in parallel with the normally opened button manually.
7. motor power supply system according to claim 6, which is characterized in that also string is equipped in the contactor control loop
Manual normally closed button, the normally closed button manually and the contactor normally opened contact, manually normally opened button are connected in parallel a little
Input terminal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821249061.1U CN208522450U (en) | 2018-08-03 | 2018-08-03 | Ground protection circuit and motor power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821249061.1U CN208522450U (en) | 2018-08-03 | 2018-08-03 | Ground protection circuit and motor power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208522450U true CN208522450U (en) | 2019-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821249061.1U Active CN208522450U (en) | 2018-08-03 | 2018-08-03 | Ground protection circuit and motor power supply system |
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| Country | Link |
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| CN (1) | CN208522450U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066590A (en) * | 2018-08-03 | 2018-12-21 | 河南森源电气股份有限公司 | A kind of ground protection circuit and motor power supply system |
-
2018
- 2018-08-03 CN CN201821249061.1U patent/CN208522450U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066590A (en) * | 2018-08-03 | 2018-12-21 | 河南森源电气股份有限公司 | A kind of ground protection circuit and motor power supply system |
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