Circuit breaker closing loop monitoring circuit, power supply switching device and boiler

Abstract

The utility model provides a circuit breaker closing loop monitoring circuit, power supply switching device and boiler, including: optical coupler IC1, action power supply, relay K1 and receiving module wherein the anode terminal of optical coupler IC1 is connected with one end of working power supply, the cathode terminal of optical coupler IC1 is connected with the other end of working power supply; the action power supply is connected with an action coil of the relay K1 through a collector end and an emitter end of the optical coupler IC1 in sequence; the receiving module is connected with the output end of the relay K1 so as to display preset information according to the output state of the relay K1. According to the utility model, the problem in the prior art that a worker cannot know the current closing loop state is solved.

Description

Technical Field

[0001] The utility model relates to the field of boiler power switching control, in particular to a circuit breaker closing loop monitoring circuit, a power switching device and a boiler. Background Art

[0002] In the current operating state of the boiler of the power plant unit, if the working power supply trips, the quick-cut device connected to the working power supply will be activated to issue a command to close the backup power switch. Under normal circumstances, the backup power supply is connected to the corresponding circuit to replace the above-mentioned working power supply for power supply.

[0003] However, in actual situations, due to the abnormal working position of the trolley in series in the backup switch closing circuit, the contact signal returns, causing the closing circuit to be disconnected. At this time, the staff cannot know the current status of the closing circuit. If the quick-cut device is still used to switch the power supply, the backup power switch will fail to close. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a circuit breaker closing circuit monitoring circuit, a power switching device and a boiler, which solve the problem in the prior art that the staff cannot know the current closing circuit status.

[0005] At least one embodiment of the present utility model provides a circuit breaker closing circuit monitoring circuit, comprising: an optical coupler IC1, an action power supply, a relay K1 and a receiving module, wherein:

[0006] The anode end of the optical coupler IC1 is connected to one end of the working power supply, and the cathode end of the optical coupler IC1 is connected to the other end of the working power supply;

[0007] The action power supply is connected to the action coil of the relay K1 through the collector terminal and the emitter terminal of the optical coupler IC1 in sequence;

[0008] The receiving module is connected to the output end of the relay K1 to display preset information according to the output state of the relay K1.

[0009] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0010] The anode and cathode ends of the optocoupler IC1 are used to collect the current of the closing circuit, which in turn affects the conduction depth between the collector and emitter ends of the optocoupler IC1, and further affects the action coil end of the relay K1, so as to output the corresponding electrical information through the output end of the relay K1 to the receiving module. The receiving module can display the corresponding preset information based on the electrical signal. At this time, the staff can know the status of the closing circuit based on the preset signal.

[0011] In a circuit breaker closing circuit monitoring circuit provided in one embodiment of the present invention, a freewheeling diode D3 is further included. The freewheeling diode D3 is connected in parallel to both ends of the action coil.

[0012] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0013] Since the action coil of relay K1 is an inductive load, when the external power supply disappears, an induced electromotive force with a direction opposite to the original voltage will be generated on the action coil. At this time, adding a freewheeling diode D3 can provide a closed loop for this induced electromotive force, releasing the current generated by the induced electromotive force to protect the circuit and avoid subsequent malfunction of relay K1.

[0014] In a circuit breaker closing circuit monitoring circuit provided in one embodiment of the present invention, an inductor L2 is further included, and the anode end of the optocoupler IC1 is connected to one end of the working power supply through the inductor L2, or the cathode end of the optocoupler IC1 is connected to the other end of the working power supply through the inductor L2.

[0015] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0016] Inductor L2 can be used for filtering to remove AC interference signals in the closing circuit.

[0017] In a circuit breaker closing circuit monitoring circuit provided in one embodiment of the present invention, a first current limiting resistor R1 is further included, and the anode end of the optocoupler IC1 is further connected to one end of the working power supply through the first current limiting resistor R1.

[0018] In a circuit breaker closing circuit monitoring circuit provided in one embodiment of the present invention, a second current limiting resistor R2 is further included, and the cathode end of the optocoupler IC1 is further connected to the other end of the working power supply through the second current limiting resistor R2.

[0019] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0020] The first current limiting resistor R1 and the second current limiting resistor R2 can both be used for voltage division to reduce loop current, thereby preventing excessive current from damaging the optocoupler IC1.

[0021] In a circuit breaker closing circuit monitoring circuit provided in one embodiment of the present invention, a Zener diode D1 is further included, and the anode terminal of the optocoupler IC1 is connected to one end of the working power supply through the Zener diode D1, or the cathode terminal of the optocoupler IC1 is connected to the other end of the working power supply through the Zener diode D1.

[0022] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0023] The voltage stabilizing diode D1 may be used to reduce the voltage across the first current limiting resistor R1 and the second current limiting resistor R2 , so as to cooperate with the first current limiting resistor R1 and the second current limiting resistor R2 to control the current passing through the optocoupler IC1 .

[0024] In a circuit breaker closing circuit monitoring circuit provided in one embodiment of the present invention, a reverse-bias diode D2 is further included, and the anode end of the optocoupler IC1 is connected to the cathode end of the optocoupler IC1 through the cathode end of the reverse-bias diode D2 and the anode end of the reverse-bias diode D2 in sequence.

[0025] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0026] The anti-reverse diode D2 can disconnect the closing circuit from the optocoupler IC1 when the closing circuit is mistakenly operated and connected to a reverse voltage, thereby protecting the optocoupler IC1.

[0027] The present utility model also provides a power switching device, comprising: a quick-cut module, a working power supply, a backup power supply, and a circuit breaker closing circuit monitoring circuit as described above, wherein the receiving module is connected to the quick-cut module, and the quick-cut module is respectively connected to the working power supply and the backup power supply to selectively control the on and off of the working power supply or the backup power supply according to the instructions of the receiving module.

[0028] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0029] By utilizing the above-mentioned circuit breaker closing circuit monitoring circuit, when the quick-cut module switches the working power supply and the backup power supply, the status of the closing circuit can be immediately fed back at the receiving module, which is convenient for staff to observe. Based on the learned status of the closing circuit, the quick-cut module can be controlled through the receiving module to switch the working power supply and the backup power supply.

[0030] In a power switching device provided by the present invention, a power switch is further connected to either end of the working power supply.

[0031] The utility model also provides a boiler in which the power switching device as described above is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a logic diagram of a circuit breaker closing circuit monitoring circuit of the utility model;

[0033] Figure 2This is a specific circuit diagram of a circuit breaker closing circuit monitoring circuit of the utility model;

[0034] Figure 3 This is a logic diagram of a power switching device according to the present invention. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0037] In this utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances. In addition, unless there is any contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0038] According to the functional characteristics of the fast-cut device, a set of circuit breaker closing circuit monitoring circuit is urgently needed to increase the closing circuit monitoring function of the backup power switch, improve the control reliability of the fast-cut device, and reduce the risk of power failure of the working bus.

[0039] The utility model provides a circuit breaker closing circuit monitoring circuit, such as Figure 1 As shown, it includes: optocoupler IC1, action power supply, relay K1 and receiving module, wherein,

[0040] The anode end of the optical coupler IC1 is connected to one end of the working power supply, and the cathode end of the optical coupler IC1 is connected to the other end of the working power supply;

[0041] The action power supply is connected to the action coil of the relay K1 through the collector terminal and the emitter terminal of the optical coupler IC1 in sequence;

[0042] The receiving module is connected to the output end of the relay K1 to display preset information according to the output state of the relay K1.

[0043] The anode and cathode ends of the optocoupler IC1 are used to collect the current of the closing circuit, which in turn affects the conduction depth between the collector and emitter ends of the optocoupler IC1, and further affects the action coil end of the relay K1, so as to output the corresponding electrical information to the receiving module through the output end of the relay K1. The receiving module can display the corresponding preset information according to the electrical signal. At this time, the staff can know the status of the closing circuit according to the preset signal. The optocoupler IC1 can be used to achieve electrical isolation between the strong current side and the weak current side, and has strong anti-interference ability.

[0044] In this embodiment, the operating power supply is 24V, the anode terminal of the optocoupler IC1 is pin 1 of the optocoupler IC1, the cathode terminal of the optocoupler IC1 is pin 2 of the optocoupler IC1, the collector terminal of the optocoupler IC1 is pin 3 of the optocoupler IC1, and the emitter terminal of the optocoupler IC1 is pin 4 of the optocoupler IC1. The two ends of the operating coil of the relay K1 are pin 1 and pin 16 of the relay K1, respectively. Among them, pin 1 of the relay K1 is connected to the emitter terminal of the optocoupler IC1, pin 16 of the relay K1 is grounded, and pins 5 and 6 of the relay K1 are one set of output terminals of the relay K1. Figure 2 As shown, pins 12 and 9 of relay K1 are also another set of output terminals of relay K1. It should be understood that since this circuit only requires one set of output terminals to be implemented, there is no need to use the other set of output terminals.

[0045] At this time, considering that this circuit only needs to detect whether there is current in the closing circuit to determine whether it is normal; that is, whether pins 5 and 6 of the output status relay K1 output voltage, the preset information is that the closing circuit is normal or the closing circuit is abnormal;

[0046] At this time, the current collected by the anode and cathode terminals of the optocoupler IC1 can control the conduction of its collector and emitter terminals. When the collector and emitter terminals are conductive, the action power supply is connected to the action coil of the relay K1, so that the action coil of the relay K1 is actuated, and then the output terminal of the relay K1 is attracted, so that the corresponding pins 5 and 8 output the corresponding voltage information value in the receiving module. After receiving the above voltage information, the receiving module can output and display the corresponding closing circuit status result, and judge that the closing circuit is normal; on the contrary, if no current is collected through the anode and cathode terminals of the optocoupler IC1, at this time the collector and emitter terminals of the optocoupler IC1 are disconnected, the action coil of the relay K1 does not act, and there is no output from pin 1 and pin 8 of the relay K1. The receiving module can output and display the corresponding closing circuit status result, and judge that the closing circuit is abnormal.

[0047] Specifically, please combine Figure 2 As shown, the circuit further includes a freewheeling diode D3, which is connected in parallel to both ends of the action coil.

[0048] Since the action coil of relay K1 is an inductive load, when the external power supply disappears, an induced electromotive force with a direction opposite to the original voltage will be generated on the action coil. At this time, adding a freewheeling diode D3 can provide a closed loop for this induced electromotive force, releasing the current generated by the induced electromotive force to protect the circuit and avoid subsequent malfunction of relay K1.

[0049] Specifically, the circuit further includes an inductor L2, and the anode terminal of the optical coupler IC1 is connected to one end of the working power supply through the inductor L2, or the cathode terminal of the optical coupler IC1 is connected to the other end of the working power supply through the inductor L2.

[0050] Inductor L2 can be used for filtering to remove AC interference signals in the closing circuit.

[0051] Specifically, the circuit further includes a first current-limiting resistor R1 , and the anode terminal of the optical coupler IC1 is further connected to one end of the working power supply through the first current-limiting resistor R1 .

[0052] Specifically, the circuit further includes a second current-limiting resistor R2 , and the cathode end of the optical coupler IC1 is further connected to the other end of the working power supply through the second current-limiting resistor R2 .

[0053] The first current limiting resistor R1 and the second current limiting resistor R2 can both be used for voltage division to reduce loop current, thereby preventing excessive current from damaging the optocoupler IC1.

[0054] Specifically, the circuit further includes a Zener diode D1, and the anode end of the optocoupler IC1 is connected to one end of the working power supply through the Zener diode D1, or the cathode end of the optocoupler IC1 is connected to the other end of the working power supply through the Zener diode D1.

[0055] The voltage stabilizing diode D1 may be used to reduce the voltage across the first current limiting resistor R1 and the second current limiting resistor R2 , so as to cooperate with the first current limiting resistor R1 and the second current limiting resistor R2 to control the current passing through the optocoupler IC1 .

[0056] Specifically, the circuit further includes an anti-reverse diode D2, and the anode terminal of the optical coupler IC1 is connected to the cathode terminal of the optical coupler IC1 through the cathode terminal of the anti-reverse diode D2 and the anode terminal of the anti-reverse diode D2 in sequence.

[0057] The anti-reverse diode D2 can disconnect the closing circuit from the optocoupler IC1 when the closing circuit is mistakenly operated and connected to a reverse voltage, thereby protecting the optocoupler IC1.

[0058] It should be understood that the receiving module mentioned in the present invention is an ECS background monitoring panel in this embodiment, which is used to monitor the state of the closing circuit and control the action of the fast-cut module.

[0059] The utility model also provides a power switching device, which is Figure 3 As shown, it is necessary to understand that Figure 3 The +KM and -KM in the figure are working power supplies, and include: a quick-cut module, a working power supply, a backup power supply, and a circuit breaker closing circuit monitoring circuit as described above. The receiving module is connected to the quick-cut module, and the quick-cut module is connected to the working power supply and the backup power supply respectively to selectively control the on / off of the working power supply or the backup power supply according to the instructions of the receiving module.

[0060] By utilizing the above-mentioned circuit breaker closing circuit monitoring circuit, when the quick-cut module switches the working power supply and the backup power supply, the status of the closing circuit can be immediately fed back at the receiving module, which is convenient for staff to observe. Based on the learned status of the closing circuit, the quick-cut module can be controlled through the receiving module to switch the working power supply and the backup power supply.

[0061] Specifically, the power switching device further includes a power switch connected to either end of the working power supply. The power switch serves as a closing coil for the auxiliary circuit breaker in the working position. When the switch trolley reaches the working position, the switch is allowed to close. If the position contact is abnormal, the closing circuit is disconnected, blocking the closing of the circuit breaker.

[0062] The utility model also provides a boiler in which the power switching device as described above is installed.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A circuit breaker closing circuit monitoring circuit, characterized in that: include: Optocoupler IC1, action power supply, relay K1 and receiving module, among which, The anode end of the optical coupler IC1 is connected to one end of the working power supply, and the cathode end of the optical coupler IC1 is connected to the other end of the working power supply; The action power supply is connected to the action coil of the relay K1 through the collector terminal and the emitter terminal of the optical coupler IC1 in sequence; The receiving module is connected to the output end of the relay K1 to display preset information according to the output state of the relay K1.

2. A circuit breaker closing circuit monitoring circuit according to claim 1, characterized in that: The device further includes a freewheeling diode D3 connected in parallel to both ends of the actuating coil.

3. A circuit breaker closing circuit monitoring circuit according to claim 1, characterized in that: An inductor L2 is further included, and the anode terminal of the optical coupler IC1 is connected to one end of the working power supply through the inductor L2, or the cathode terminal of the optical coupler IC1 is connected to the other end of the working power supply through the inductor L2.

4. A circuit breaker closing circuit monitoring circuit according to claim 1, characterized in that: It also includes a first current limiting resistor R1 , and the anode terminal of the optical coupler IC1 is further connected to one end of the working power supply through the first current limiting resistor R1 .

5. A circuit breaker closing circuit monitoring circuit according to claim 4, characterized in that: A second current-limiting resistor R2 is also included, and the cathode end of the optical coupler IC1 is also connected to the other end of the working power supply through the second current-limiting resistor R2.

6. A circuit breaker closing circuit monitoring circuit according to claim 5, characterized in that: It also includes a voltage regulator diode D1. The anode end of the optical coupler IC1 is connected to one end of the working power supply through the voltage regulator diode D1, or the cathode end of the optical coupler IC1 is connected to the other end of the working power supply through the voltage regulator diode D1.

7. A circuit breaker closing circuit monitoring circuit according to claim 1, characterized in that: It also includes an anti-reverse diode D2. The anode end of the optical coupler IC1 is connected to the cathode end of the optical coupler IC1 through the cathode end of the anti-reverse diode D2 and the anode end of the anti-reverse diode D2 in sequence.

8. A power switching device, characterized in that: include: A quick-cut module, a working power supply, a backup power supply, and a circuit breaker closing circuit monitoring circuit as described in any one of claims 1 to 7, wherein the receiving module is connected to the quick-cut module, and the quick-cut module is respectively connected to the working power supply and the backup power supply to selectively control the on and off of the working power supply or the backup power supply according to the instructions of the receiving module.

9. The power switching device according to claim 8, characterized in that: Either end of the working power supply is also connected to a power switch.

10. A boiler, characterized in that: A power switching device as claimed in claim 8 or 9 is installed.

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