CN219843421U - Automatic tripping circuit for tripping of 400V PC switch cabinet breaker - Google Patents
Automatic tripping circuit for tripping of 400V PC switch cabinet breaker Download PDFInfo
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- CN219843421U CN219843421U CN202320963811.6U CN202320963811U CN219843421U CN 219843421 U CN219843421 U CN 219843421U CN 202320963811 U CN202320963811 U CN 202320963811U CN 219843421 U CN219843421 U CN 219843421U
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- breaker
- automatic
- protection device
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Abstract
The 400V PC switch cabinet breaker trip automatic tripping circuit. When a short-circuit fault occurs to the load cable or the motor in the field operation, the protection device returns to the un-outlet tripping contactor, the remote monitoring background still displays the operation of the equipment, but the actual equipment is stopped. The composition of the utility model comprises: an accident emergency button tripping circuit, a normal breaker tripping circuit and a breaker tripping automatic tripping circuit. The +KM power supply of the emergency button tripping circuit is connected with the normally open contact of the emergency button in series and then connected with the emergency tripping opening contact of the motor protection device; the automatic tripping circuit of the circuit breaker is connected with the normal breaking circuit of the circuit breaker in parallel; the +KM power supply of the breaker trip automatic tripping circuit is connected in series with the normally closed contact of the breaker trip auxiliary switch and then connected into the opening and closing contact of the motor protection device of the motor. The utility model is used for tripping the breaker of the switch cabinet.
Description
Technical Field
The utility model relates to a 400V PC switch cabinet circuit breaker tripping automatic tripping circuit.
Background
In a thermal power plant, the generator can normally generate electricity and is completely completed by the close matching of all systems, and the normal operation of all sub-systems is not separated from the dragging of mechanical loads such as a water pump, a fan and the like, so that the safety and stability operation of the generator set are directly influenced by whether the motor of the mechanical loads such as the water pump, the fan and the like can normally operate.
Generally, a 400V power supply system of a thermal power plant adopts a PC (power center) and MCC (motor control center) two-stage power supply mode. The PC power center is generally provided with a fixed switch which is larger than 400A, the MCC motor control center is provided with a drawer unit which is provided with a switch PC cabinet smaller than 400A and can be connected with a plurality of MCCs and larger load motors, the MCCs are loads of the PC, and the MCCs are only connected with loads below 50 KW. The control loops of the PC switch all adopt dc power supply and are all important loads, for example: the high-voltage fluidization fan, the mechanical vacuum pump, the sealing fan and the like are mainly used for ensuring that when a bus is in power failure, a control loop of the load is not in power failure, low-voltage protection is provided, and a load motor can not stop working in the short-time process of losing alternating current and recovering, so that the safe operation of a unit is ensured.
Although the control loop adopts a direct current power supply to solve the problem that the load motor cannot stop working in the short-time power failure recovery process of the bus, other problems are also derived. When a short circuit fault occurs to a load cable or a motor in field operation, the protection action time of the circuit breaker is earlier than the action outlet time of the protection device, the protection device is timely cut off by the circuit breaker due to the fault, the protection device returns to the un-outlet tripping contactor, the remote monitoring background still displays equipment operation, but the actual equipment is stopped, so that standby equipment cannot be connected, the safe and stable operation of a unit is seriously affected, the unit is not stopped due to slight carelessness, and huge economic loss is brought, so that the problems are forced to be solved.
Disclosure of Invention
Aiming at the defects and shortcomings in the technology, the utility model aims to provide an automatic tripping circuit for tripping a 400V PC switch cabinet breaker.
The above object is achieved by the following technical scheme:
A400V PC switch cabinet breaker trip automatic tripping circuit comprises an accident emergency button tripping circuit, a breaker normal breaking circuit and a breaker trip automatic tripping circuit;
the +KM power supply of the emergency button tripping circuit is connected with the normally open contact of the emergency button in series and then connected with the emergency tripping opening contact of the motor protection device;
the automatic tripping circuit of the circuit breaker is connected with the normal breaking circuit of the circuit breaker in parallel;
the +KM power supply of the breaker trip automatic tripping circuit is connected in series with the normally closed contact of the breaker trip auxiliary switch and then connected into the opening and closing contact of the motor protection device of the motor.
The 400V PC switch cabinet circuit breaker trip automatic tripping circuit, the circuit breaker be moulded case circuit breaker.
Advantageous effects
1. The utility model is connected with an automatic tripping and tripping circuit of the circuit breaker in parallel on the basis of the normal breaking circuit of the circuit breaker, the automatic tripping and tripping circuit of the circuit breaker is connected with a breaking and switching-in point of a motor protection device after a normally closed contact of a tripping auxiliary switch of the circuit breaker is connected in series by a +KM power supply, and is used as a tripping circuit of the tripping interlocking protection device of the circuit breaker, when the circuit breaker trips, the auxiliary normally closed contact is conducted, the tripping auxiliary contact does not act when the circuit breaker normally breaks the brake, the tripping circuit works, an outlet of the protection device breaks a contactor, a remote background stops the display equipment, and the interlocking standby equipment is started in time. Therefore, the contactor can normally open when the breaker is tripped.
Drawings
FIG. 1 is a circuit diagram of the present utility model;
in the figure: 1. a direct current control power supply; 2. a normally open contact (NO) of the emergency button; 3. a motor protection device; 4. a remote on-site transfer switch; 5. a brake opening/closing button; 6. a PLC switching-on/off gate contact; 7. a contactor; 8. the breaker trip auxiliary switch is normally closed.
Detailed Description
Referring to fig. 1, a 400V PC switchgear circuit breaker trip automatic trip circuit includes an emergency button trip circuit, a circuit breaker normal breaking circuit, and a circuit breaker trip automatic trip circuit.
The accident emergency button tripping circuit components consist of a direct current control power supply 1, a normally open contact (NO) 2 of the emergency button, a motor protection device 3 of the motor and connecting cables between circuits. The breaker opening (closing) gate circuit consists of a normal opening (closing) gate circuit and a breaker tripping automatic tripping circuit: the normal opening (closing) gate circuit consists of a direct current control power supply 1, a remote on-site change-over switch 4, an opening (closing) gate button 5 or a PLC opening (closing) gate contact 6, a motor protection device 3, a contactor 7 and connecting cables among the circuits; the automatic tripping circuit of the breaker tripping is composed of a direct-current control power supply 1, a normally closed contact 8 of an auxiliary tripping switch of the breaker, a motor protection device 3 and a connecting cable between the circuits. The emergency trip circuit of the accident emergency button is connected with the normally open contact 2 of the emergency button in series by the +KM power supply 1 and then is connected with the emergency trip switch-in contact B10 of the motor protection device 3, and when the normal switching-off circuit is abnormal, the fault can still be cut off by the emergency trip circuit. The breaker tripping automatic tripping circuit is connected in parallel with the normal breaking circuit of the breaker, the normal breaking circuit is connected with a remote on-site transfer switch 4 in series by a +KM power supply 1, and then is connected with a breaking button 5 or a PLC breaking (switching) junction 6 in series and then is connected with a breaking switch-in junction B8 of a motor protection device 3; the breaker trip automatic tripping circuit is connected with a normally closed contact 8 of a breaker trip auxiliary switch in series by a +KM power supply 1 and then is connected with a break-off switch-in contact B8 of a motor protection device, so that normal break-off of a contactor is realized.
And two ends of the normal breaking circuit of the circuit breaker are connected with an automatic tripping circuit of the circuit breaker in parallel, when the circuit breaker trips, an auxiliary normally closed contact is conducted (a tripping auxiliary contact does not act when the circuit breaker breaks normally), the tripping circuit works, an outlet of the protection device trips the contactor, and the remote background stops the display equipment and timely interlocks the standby equipment to start.
Claims (2)
1. A400V PC switch cabinet breaker trip automatic tripping circuit is characterized in that: the circuit breaker tripping automatic tripping circuit comprises an accident emergency button tripping circuit, a normal breaker tripping circuit and a breaker tripping automatic tripping circuit;
the +KM power supply of the emergency button tripping circuit is connected with the normally open contact of the emergency button in series and then connected with the emergency tripping opening contact of the motor protection device;
the breaker tripping automatic tripping loop is connected with the breaker normal breaking loop in parallel;
the +KM power supply of the breaker trip automatic tripping circuit is connected in series with the normally closed contact of the breaker trip auxiliary switch and then connected into the opening and closing contact of the motor protection device of the motor.
2. The 400V PC switchgear circuit breaker trip auto-tripping circuit of claim 1, characterized by: the circuit breaker is a molded case circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320963811.6U CN219843421U (en) | 2023-04-26 | 2023-04-26 | Automatic tripping circuit for tripping of 400V PC switch cabinet breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320963811.6U CN219843421U (en) | 2023-04-26 | 2023-04-26 | Automatic tripping circuit for tripping of 400V PC switch cabinet breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219843421U true CN219843421U (en) | 2023-10-17 |
Family
ID=88305542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320963811.6U Active CN219843421U (en) | 2023-04-26 | 2023-04-26 | Automatic tripping circuit for tripping of 400V PC switch cabinet breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219843421U (en) |
-
2023
- 2023-04-26 CN CN202320963811.6U patent/CN219843421U/en active Active
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