CN211629854U - Circuit breaker protection trip circuit - Google Patents
Circuit breaker protection trip circuit Download PDFInfo
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- CN211629854U CN211629854U CN202020429955.XU CN202020429955U CN211629854U CN 211629854 U CN211629854 U CN 211629854U CN 202020429955 U CN202020429955 U CN 202020429955U CN 211629854 U CN211629854 U CN 211629854U
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Abstract
The utility model discloses a circuit breaker protection trip circuit, include: the protection tripping device comprises a direct-current power supply, a protection tripping outlet relay normally open contact, a protection tripping pressure plate, a breaker auxiliary normally open contact and a brake separating coil; one end of a normally open contact of the trip protection outlet relay is connected with the positive electrode of the direct-current power supply, the other end of the normally open contact of the trip protection outlet relay is connected with one end of a trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of an auxiliary normally open contact of the breaker, the other end of the auxiliary normally open contact of the breaker is connected with one end of a brake separating coil, and the other end of the brake separating coil is connected with the negative electrode of; the normally open contact of the protection trip outlet relay is closed when the line and the load equipment have short circuit faults. The utility model discloses a circuit breaker protection tripping circuit when circuit and load equipment short-circuit fault take place, can realize the reliable action of protection, and the fault current is cut off in the circuit breaker tripping operation, has ensured power supply system's safe and reliable.
Description
Technical Field
The utility model relates to a circuit breaker protection control technical field especially relates to a circuit breaker protection tripping circuit.
Background
The high-voltage circuit breaker is used as important electrical equipment in a power system, can switch on and off load current under normal conditions, and can timely and reliably cut off a fault line when a fault occurs, so that the safety of a power supply system is ensured. Therefore, it is very important to develop a circuit breaker trip protection circuit, when short circuit fault occurs in the line and the load equipment, the protection system can correctly and reliably act, the line is tripped and loses power, and the safety and reliability of the power supply system are ensured.
SUMMERY OF THE UTILITY MODEL
For the technical problem who exists among the above-mentioned prior art of solution, the utility model provides a circuit breaker protection tripping circuit. The specific technical scheme is as follows:
a circuit breaker protective trip circuit comprising: the protection tripping device comprises a direct-current power supply, a protection tripping outlet relay normally open contact, a protection tripping pressure plate, a breaker auxiliary normally open contact and a brake separating coil; one end of the normally open contact of the trip protection outlet relay is connected with the positive electrode of the direct-current power supply, the other end of the normally open contact of the trip protection outlet relay is connected with one end of the trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of the auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative electrode of the direct-current power supply; the breaker auxiliary normally open contact is in a closed state under the working state of the breaker, and the normally open contact of the trip protection outlet relay is closed when short circuit faults occur on lines and load equipment.
In one possible design, the circuit further includes a trip hold relay coil and its self-holding contacts; the tripping hold relay coil is connected in series between the protection tripping pressure plate and the auxiliary normally open contact of the circuit breaker; one end of the tripping holding relay self-holding contact is connected with the positive electrode of the direct-current power supply, and the other end of the tripping holding relay self-holding contact is connected with the common ends of the protective tripping pressing plate and the tripping holding relay coil.
In one possible design, the circuit further comprises a protection trip outlet relay coil, the protection trip outlet relay coil is connected with a current transformer through a current transformer, and when the secondary protection current of the current transformer is greater than a protection current set value, the protection trip outlet relay coil is electrified, so that the normally open contact of the protection trip outlet relay is closed.
In one possible embodiment, a dc power supply is provided with a dc power switch for switching off the dc power supply.
In one possible design, the voltage of the dc power supply is 220V.
The utility model discloses technical scheme's main advantage as follows:
the utility model discloses a circuit breaker protection tripping circuit, when circuit and load equipment take place short-circuit fault, the closed switch-on of protection tripping outlet relay normally open contact, DC power supply passes through the supplementary normally open contact of circuit breaker, gives the power supply of separating brake coil, has switched on circuit breaker protection tripping circuit, and the electro-magnet action drives operating device action, realizes circuit breaker protection action, and circuit breaker tripping operation disconnection cuts off the fault current, has ensured power supply system safe and reliable.
Drawings
The accompanying drawings, which are set forth herein, serve to provide a further understanding of the embodiments of the present invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are illustrative of the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a circuit diagram of a circuit breaker trip protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit structure of the microcomputer protection measurement and control device in which the protection trip outlet relay is connected with the current transformer.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
An embodiment of the utility model provides a circuit breaker protection trip circuit, as shown in figure 1, include: the trip protection circuit comprises a direct-current power supply KM, a protection trip outlet relay normally open contact BTJ1, a protection trip pressing plate LP1, a breaker auxiliary normally open contact QF and a brake separating coil TQ; one end of a normally open contact BTJ1 of the protection tripping outlet relay is connected with the positive electrode + KM of the direct-current power supply, the other end of the normally open contact BTJ1 of the protection tripping outlet relay is connected with one end of a protection tripping pressing plate LP1, the other end of the protection tripping pressing plate LP1 is connected with one end of an auxiliary normally open contact QF of the breaker, the other end of the auxiliary normally open contact QF of the breaker is connected with one end of a brake separating coil TQ, and the other end of the brake separating coil TQ is connected with the negative; the breaker auxiliary normally open contact QF is in a closed state in the working state of the breaker, and the protection trip outlet relay normally open contact BTJ1 is closed when short-circuit faults occur in lines and load equipment.
The working principle of the circuit breaker protection trip circuit provided by the embodiment of the invention is explained as follows:
when the breaker is switched on, the auxiliary normally open contact QF of the breaker is in a closed state. When short-circuit faults occur to line and load equipment, the normally open contact BTJ1 of the protection tripping outlet relay is closed, so that a loop where the normally open contact BTJ1 of the protection tripping outlet relay, the protection tripping pressing plate LP1, the auxiliary normally open contact QF of the breaker and the separating brake coil TQ are located is communicated with the direct-current power supply KM, and the separating brake coil TQ is electrified to control the separating brake of the breaker. The protective trip pressure plate LP1 can be closed or opened under human control to facilitate control of whether the circuit breaker protective trip circuit is in use.
It can be seen, the embodiment of the utility model provides a circuit breaker protection tripping circuit, when circuit and load equipment take place short-circuit fault, the closed switch-on of protection tripping outlet relay normally open contact BTJ1, direct current power supply KM is through the supplementary normally open contact QF of circuit breaker, for separating brake coil TQ power supply, the circuit breaker protection tripping circuit has been put through, the separating brake electro-magnet action, drive operating device action, realize circuit breaker protection action, circuit breaker tripping operation disconnection cuts off fault current, power supply system safe and reliable has been ensured.
Further, the circuit provided by the embodiment of the present invention further includes a trip hold relay coil TBJ and its self-holding contact TBJ 1; the trip hold relay coil TBJ is connected in series between the protective trip pressure plate LP1 and the breaker auxiliary normally open contact QF; one end of the trip hold relay latching contact TBJ1 is connected to the positive terminal + KM of the dc power supply, and the other end is connected to the common terminal of the protective trip pressure plate LP1 and the trip hold relay coil TBJ. So set up, protection trip exit relay normally open contact BTJ1 closes the switch-on, and when trip hold relay coil TBJ got electric, trip hold relay self-sustaining contact TBJ1 closed, can prevent that the separating brake contact on-time when normal separating brake operation is short or return too fast or the separating brake coil TQ that protection trip exit relay normally open contact BTJ1 trembles, closure insufficient probably caused can not the reliable action correctly. And the direct-current power supply KM is switched on through the trip holding relay self-holding contact TBJ1, so that the reliability of normal opening and tripping protection actions of the circuit breaker is improved.
Even if the normally open contact BTJ1 of the trip outlet protection relay is subjected to unstable actions such as bouncing, the brake separating coil TQ is still connected with the direct-current power supply KM through the trip holding relay self-holding contact TBJ1 to be kept in a power-on state, and the reliability of the trip circuit protection is improved.
The embodiment of the utility model provides an in, to protect trip outlet relay normally open contact BTJ1 how to close when short circuit fault takes place for circuit and load equipment, explain below:
as shown in the attached drawing 2, the embodiment of the utility model provides a circuit breaker protection trip circuit still includes protection trip outlet relay coil BTJ, and protection trip outlet relay coil BTJ passes through the current transformer and is connected with current transformer, and when current transformer's secondary protection current was greater than the protection current setting value, protection trip outlet relay coil BTJ got electric for protection trip outlet relay normally open contact BTJ1 is closed. And a low-pass filtering module, an A/D (analog/digital) conversion module and a logic operation module can be arranged between the protection trip outlet relay coil BTJ and the current converter.
The specific process is as follows: a high-voltage current transformer is installed in a field high-voltage switch cabinet, secondary protection current (rated 5A or 1A) output by a secondary loop of each current transformer is connected to a measurement and control unit of a microcomputer protection measurement and control device through a current wiring terminal, but the value is large, the variation range is large, the requirement of a digital-to-analog converter is not met, after the secondary protection current is connected to an alternating current sampling plug-in board of the protection measurement and control device, the secondary protection current is converted into a weak voltage signal through a current converter, then the weak voltage signal is input to an A/D digital-to-analog converter through a low-pass filter and converted into a digital signal suitable for the protection device, and finally the digital signal enters a CPU plug-in to process, logically judge. Therefore, after the starting condition of the protection element is met, such as current and time, when the starting condition is respectively larger than a protection current set value or after a certain time delay is met, the coil of the trip protection outlet relay is electrified, and a normally open contact of the trip protection outlet relay is closed, so that a circuit breaker is connected to protect a trip circuit, the circuit breaker is tripped, and the safety and the reliability of a power supply system are ensured.
Optionally, the embodiment of the utility model provides a DC power supply KM department is provided with DC circuit breaker 1DK for cut off DC power supply KM, whether the control circuit breaker of being convenient for works.
Alternatively, the voltage of the dc power supply KM may be 220V.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. A circuit breaker protective trip circuit, comprising: the protection tripping device comprises a direct-current power supply, a protection tripping outlet relay normally open contact, a protection tripping pressure plate, a breaker auxiliary normally open contact and a brake separating coil;
one end of the normally open contact of the trip protection outlet relay is connected with the positive electrode of the direct-current power supply, the other end of the normally open contact of the trip protection outlet relay is connected with one end of the trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of the auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative electrode of the direct-current power supply;
the breaker auxiliary normally open contact is in a closed state under the working state of the breaker, and the normally open contact of the trip protection outlet relay is closed when short circuit faults occur on lines and load equipment.
2. The circuit breaker protective trip circuit of claim 1 wherein the circuit further comprises a trip hold relay coil and its self-holding contacts;
the tripping hold relay coil is connected in series between the protection tripping pressure plate and the auxiliary normally open contact of the circuit breaker;
one end of the tripping holding relay self-holding contact is connected with the positive electrode of the direct-current power supply, and the other end of the tripping holding relay self-holding contact is connected with the common ends of the protective tripping pressing plate and the tripping holding relay coil.
3. The circuit breaker guarded trip circuit of claim 1 further comprising a guarded trip outlet relay coil connected to a current transformer through a current transformer, the guarded trip outlet relay coil energized when a secondary protective current of the current transformer is greater than a guarded current set point, causing the guarded trip outlet relay normally open contact to close.
4. The circuit breaker protective trip circuit of claim 1 wherein a dc circuit breaker is provided at the dc power source for breaking the dc power source.
5. The circuit breaker protection trip circuit of claim 1 wherein the voltage of the dc power source is 220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020429955.XU CN211629854U (en) | 2020-03-30 | 2020-03-30 | Circuit breaker protection trip circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020429955.XU CN211629854U (en) | 2020-03-30 | 2020-03-30 | Circuit breaker protection trip circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211629854U true CN211629854U (en) | 2020-10-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020429955.XU Active CN211629854U (en) | 2020-03-30 | 2020-03-30 | Circuit breaker protection trip circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211629854U (en) |
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2020
- 2020-03-30 CN CN202020429955.XU patent/CN211629854U/en active Active
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