A low voltage direct current bypass parallel device

Abstract

The present invention discloses a low-voltage direct current bypass parallel device, comprising: a main circuit and a control circuit; the main circuit comprises: an incoming line side, a main contactor, and an outgoing line side; control coil circuits of an intermediate relay are provided on both sides of the main contactor; the control circuit comprises: an incoming line side voltage indication circuit and an outgoing line side manual and automatic control circuit; when there is no voltage on the outgoing line side, or the voltage is incorrect, or the polarity is wrong, the control coil of the intermediate relay is in a non-acting state, the red flashing alarm light of the incoming line side voltage indication circuit is in an alarm state, and the parallel control circuit is in a disconnected state; when the outgoing line side is correctly connected, and the voltage and polarity are correct, the control coil of the intermediate relay is in an acting state, the red flashing alarm light of the incoming line side voltage indication circuit is in a non-alarm state, and the parallel control circuit is in a connected state, so as to perform load transfer of the direct current outgoing line circuit to be replaced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power equipment, and more specifically, relates to a low-voltage direct current bypass parallel device. Background Art

[0002] In the field of low-voltage DC power supply technology, the low-voltage DC systems of substations, power plants, and other substations are crucial. However, existing low-voltage DC systems present several challenges. Typically, the electrical life of low-voltage DC equipment is 10-15 years. When this lifespan is nearing, the entire station's low-voltage DC system requires retrofitting. Traditional replacement procedures present numerous challenges when performed without interrupting feeder power.

[0003] In the prior art, each DC feeder to be transferred required manual polarity verification, requiring two people to work together, one to perform the verification. This process was not only cumbersome but also time-consuming and labor-intensive. If the low-voltage DC system is replaced during a power outage, for intervals equipped with a single set of protection devices, the protection must be deactivated to replace the device's power supply line, which undoubtedly has a negative impact on power supply reliability. For intervals equipped with dual protection devices, the protection must be deactivated in turn to replace the device's power supply line, significantly increasing the workload and compromising operability.

[0004] It can be seen that how to improve the efficiency of the replacement process and avoid excessive workload when two people perform the replacement is a key issue that technicians in this field are concerned about. Summary of the Invention

[0005] The purpose of this application is to provide a low-voltage direct current bypass parallel device to improve the efficiency of the replacement process, reduce the amount of operation required by technicians during replacement, and lower the operating threshold.

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a low-voltage direct current bypass parallel device, comprising: a main circuit and a control circuit;

[0007] The main circuit includes: an incoming line side, a main contactor, and an outgoing line side; both sides of the main contactor are provided with a control coil circuit of an intermediate relay;

[0008] The control circuit includes: an input and output voltage indication circuit, and a parallel manual and automatic control circuit; the normally closed contact of the intermediate relay is provided in the input and output voltage indication circuit; the normally open contact of the intermediate relay is provided in the parallel manual and automatic control circuit; the control terminal of the main contactor is provided in the parallel manual and automatic control circuit; the input and output voltage indication circuit is provided with a red flashing alarm light;

[0009] When there is no voltage on the outgoing line side, or the voltage is incorrect or the polarity is wrong, the control coil of the intermediate relay is in a non-operating state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in an alarm state, and the parallel control circuit is in a disconnected state;

[0010] When the outgoing line side wiring is correct, and the voltage and polarity are correct, the control coil of the intermediate relay is in an operative state, the red flashing alarm light of the incoming and outgoing line side voltage indication circuit is in a non-alarm state, and the parallel control circuit is in an on state, so as to perform load transfer of the DC outgoing line circuit to be replaced.

[0011] Optionally, when the parallel control circuit is in the on state and the manual mode terminal is connected, wait for the manual button to be triggered; when the manual button is triggered, the main contactor is actuated so that the outgoing line side is energized, and the load of the DC outgoing line circuit to be replaced is transferred.

[0012] Optionally, when the parallel control circuit is in an on state and the automatic mode terminal is connected, the main contactor is actuated so that the outgoing line side is energized, and the load of the DC outgoing line circuit to be replaced is transferred.

[0013] Optionally, the input and output line side voltage indication circuit includes: an output line side sound and light alarm circuit and an input and output line indication voltage meter circuit; wherein, the output line side sound and light alarm circuit is provided with the red flashing alarm light and the normally closed contacts of two intermediate relays in parallel, and when the control coil of the intermediate relay is in a non-actuating state, the red flashing alarm light is in an alarm state.

[0014] Optionally, the parallel manual-automatic control circuit includes: a manual mode link, an automatic mode link, and a control end of the main contactor; the automatic mode link includes: an automatic mode terminal and the normally open contacts of two intermediate relays connected in series; the manual mode link includes: a manual mode terminal, the normally open contacts of two intermediate relays connected in series, and a manual button.

[0015] Optionally, the outgoing line side sound and light alarm circuit is further provided with a sound alarm. When the red flashing alarm light is in an alarm state, the sound alarm sounds an alarm.

[0016] The present application provides a low-voltage direct current bypass parallel device, comprising: a main circuit and a control circuit; the main circuit comprises: an incoming line side, a main contactor, and an outgoing line side; both sides of the main contactor are provided with a control coil circuit of an intermediate relay; the control circuit comprises: an incoming and outgoing line side voltage indication circuit, and a parallel manual and automatic control circuit; the normally closed contact of the intermediate relay is provided in the incoming and outgoing line side voltage indication circuit; the normally open contact of the intermediate relay is provided in the parallel manual and automatic control circuit; the control end of the main contactor is provided in the parallel manual and automatic control circuit; the incoming and outgoing line side voltage indication circuit A red flashing alarm light is provided in the indicator circuit; when there is no voltage on the outgoing line side, or the voltage is incorrect or the polarity is wrong, the control coil of the intermediate relay is in a non-acting state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in an alarm state, and the parallel control circuit is in a disconnected state; when the outgoing line side wiring is correct, and the voltage and polarity are correct, the control coil of the intermediate relay is in an acting state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in a non-alarm state, and the parallel control circuit is in a connected state, so as to perform load transfer of the DC outgoing line circuit to be replaced.

[0017] It has the following beneficial effects:

[0018] By automatically detecting the voltage and polarity of the outgoing line, manual verification is eliminated, saving manpower and time. This automated detection process not only improves work efficiency but also reduces the potential for human error, making operations more accurate and reliable. Furthermore, it avoids the potential safety hazards associated with manual verification and enhances overall system stability, making the device more practical and safer in practical applications and significantly facilitating the replacement and maintenance of low-voltage DC systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0020] Figure 1 A schematic structural diagram of a low-voltage direct current bypass parallel device provided in an embodiment of the present application;

[0021] Figure 2 A circuit diagram of a low-voltage direct current bypass parallel device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The core of this application is to provide a low-voltage direct current bypass parallel device to improve the efficiency of the replacement process, reduce the amount of operation required by technicians during replacement, and lower the operating threshold.

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0024] The following describes a low-voltage direct current bypass parallel device provided by the present application through an embodiment.

[0025] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a low-voltage direct current bypass parallel device provided in an embodiment of the present application.

[0026] In this embodiment, the device may include:

[0027] Main circuit 10 and control circuit 20;

[0028] The main circuit 10 includes: an incoming line side, a main contactor, and an outgoing line side; both sides of the main contactor are provided with a control coil circuit of an intermediate relay;

[0029] The control circuit 20 includes: an input / output line voltage indication circuit and a parallel manual / automatic control circuit; the normally closed contact of the intermediate relay is provided in the input / output line voltage indication circuit; the normally open contact of the intermediate relay is provided in the parallel manual / automatic control circuit; the control terminal of the main contactor is provided in the parallel manual / automatic control circuit; and a red flashing alarm light is provided in the input / output line voltage indication circuit.

[0030] When there is no voltage on the outgoing line side or the voltage is incorrect or the polarity is wrong, the control coil of the intermediate relay is in a non-acting state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in an alarm state, and the parallel control circuit is in a disconnected state;

[0031] When the outgoing line is connected correctly, the voltage is correct, and the polarity is correct, the control coil of the intermediate relay is in the actuating state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in the non-alarm state, and the parallel control circuit is in the on state, so that the load of the DC outgoing line circuit to be replaced can be transferred.

[0032] In the main circuit 10, the incoming line is connected to the power supply, and the outgoing line is connected to the DC outgoing line circuit to be replaced. The main contactor connects or disconnects the circuit, and the control coil circuits of the intermediate relays on both sides of it detect the voltage and polarity of the outgoing line.

[0033] In control circuit 20, the voltage indicator circuits on the incoming and outgoing lines are connected to a red flashing warning light via the normally closed contacts of an intermediate relay. When there's no voltage on the outgoing line, incorrect voltage, or incorrect polarity, the intermediate relay's control coil remains inactive, and the normally closed contacts remain closed, energizing the red flashing warning light and signaling an alarm. Simultaneously, the parallel control circuit remains disconnected to prevent erroneous load transfer.

[0034] When the outgoing line is correctly wired, voltage, and polarity are correct, the control coil of the intermediate relay activates, closing the normally open contact. At this point, the red flashing warning light on the incoming and outgoing line voltage indicator circuits turns off, indicating normal circuit status and the parallel control circuit is connected. Upon receiving the signal at the control terminal of the main contactor, the main contactor activates, energizing the outgoing line and transferring the load to the DC outgoing line circuit to be replaced.

[0035] The device automatically and accurately determines the status of the outgoing line and performs corresponding control operations based on the results. By switching the intermediate relay, it achieves precise monitoring and control of the circuit status, ensuring the safety and reliability of load transfer. This principle also simplifies the device's operation, reduces the impact of human factors on the replacement process, and improves work efficiency and stability.

[0036] It can be seen that the principle of this device is based on the detection of the voltage and polarity on the outgoing line side. The voltage indication on the incoming and outgoing line sides and the state switching of the parallel control circuit are realized through the control of the intermediate relay, thereby ensuring the safe, reliable and efficient implementation of the low-voltage DC bypass parallel process.

[0037] In summary, this embodiment automatically detects the voltage and polarity on the outgoing line side, eliminating the need for manual verification and saving manpower and time. This automated detection process not only improves work efficiency but also reduces the potential for human error, making operations more accurate and reliable. Furthermore, it avoids the potential safety hazards associated with manual verification and enhances the stability of the entire system, making the device more practical and safer in practical applications and greatly facilitating the replacement and maintenance of low-voltage DC systems.

[0038] Optionally, when the parallel control circuit is in the on state and the manual mode terminal is connected, wait for the manual button to be triggered; when the manual button is triggered, the main contactor operates so that the outgoing line side is energized, and the load of the DC outgoing line circuit to be replaced is transferred.

[0039] This optional solution further illustrates the operation when the parallel control circuit is connected and the manual mode terminal is connected. At this point, the device waits for the manual button to be triggered. Once triggered, the main contactor operates, energizing the outgoing line, thereby transferring the load to the DC outgoing line circuit to be replaced. This manual control mode provides the operator with more flexible operating options, allowing manual operation based on actual needs in specific situations, increasing the device's operability and applicability.

[0040] Optionally, when the parallel control circuit is in the on state and the automatic mode terminal is connected, the main contactor is actuated so that the outgoing line side is energized, and the load of the DC outgoing line circuit to be replaced is transferred.

[0041] This claim states that when the parallel control circuit is connected and the automatic mode terminal is connected, the main contactor automatically activates, energizing the outgoing line, thereby transferring the load to the DC outgoing circuit to be replaced. This automatic mode significantly improves work efficiency and reduces manual intervention, making it particularly suitable for scenarios requiring timely operation. The automatic mode setting enables more intelligent operation of the device, enhancing the system's automation level.

[0042] Optionally, the voltage indication circuit on the input and output side includes: an audible and visual alarm circuit on the output side and an input and output line indicating voltmeter circuit; wherein, the audible and visual alarm circuit on the output side is provided with a red flashing alarm light and normally closed contacts of two intermediate relays in parallel. When the control coil of the intermediate relay is in a non-actuated state, the red flashing alarm light is in an alarm state.

[0043] Claim 4 specifies the specific components of the voltage indicator circuit on the incoming and outgoing lines, including the outgoing line sound and light alarm circuit and the incoming and outgoing line indicator voltage meter circuit. The outgoing line sound and light alarm circuit features a red flashing alarm light and two normally closed contacts of parallel intermediate relays. When the control coil of the intermediate relay is inactive, the red flashing alarm light indicates an alarm state. This design allows operators to promptly identify abnormal conditions on the outgoing line through intuitive sound and light alarm signals, allowing them to take appropriate measures and ensure safe system operation.

[0044] Optional, parallel manual and automatic control circuit, including: manual mode link, automatic mode link, control end of main contactor; automatic mode link, including: automatic mode terminal, normally open contacts of two intermediate relays in series; manual mode link, including: manual mode terminal, normally open contacts of two intermediate relays in series, manual button.

[0045] The claim details the components of the parallel manual-automatic control circuit, including a manual mode link, an automatic mode link, and the control terminal of the main contactor. The automatic mode link includes the automatic mode terminal and the normally open contacts of two series-connected intermediate relays, while the manual mode link includes the manual mode terminal, the normally open contacts of two series-connected intermediate relays, and a manual button. This design allows for clear separation between manual and automatic modes, allowing each to operate independently while also enabling flexible control through the switching of intermediate relays, meeting operational requirements in diverse scenarios.

[0046] Optionally, the outgoing line side sound and light alarm circuit is further provided with a sound alarm. When the red flashing alarm light is in the alarm state, the sound alarm sounds an alarm.

[0047] This claim adds an audible alarm to the outgoing line's audible and visual alarm circuit. When the red flashing warning light enters the alarm state, the audible alarm sounds, further enhancing the alarm's effectiveness and ensuring operators are more aware of outgoing line anomalies, improving system safety and reliability. The addition of the audible alarm makes the alarm message more visible and prominent, effectively alerting operators to take appropriate action.

[0048] Furthermore, the low-voltage direct current bypass parallel device provided by the present application is further described through the following embodiments.

[0049] Reference Figure 2 , Figure 2 A circuit diagram of a low-voltage direct current bypass parallel device provided in an embodiment of the present application.

[0050] Figure 1 Among them, 1FU to 2FU are fuses, 1PV to 2PV are DC voltmeters, 1ZJ to 2ZJ are intermediate relays, LD is a green light, HD is a red light, SD is a flashing buzzer light, D1 to D6 are diodes, WD1 to WD3 are voltage regulator diodes, KM is the main contactor, KK is the switching handle, and SB1 to SB2 are manual buttons.

[0051] The low-voltage DC bypass paralleling device in this embodiment consists of a main circuit 10 and a control circuit 20. The main circuit 10 consists of the incoming line side, the main contactor, and the outgoing line side. The control circuit 20 includes the incoming and outgoing line voltage and indicator circuits and the manual and automatic paralleling control circuit. When there is no voltage on the outgoing line, incorrect voltage, or incorrect polarity, a red flashing alarm light sounds, and the paralleling control circuit is disconnected. When the outgoing line is correctly wired, and the voltage and polarity are correct, the flashing buzzer light stops sounding, and the paralleling control circuit is connected. Manual and automatic paralleling modes can be selected. After the main contactor is activated, the outgoing line side is energized, and load transfer to the DC outgoing line circuit to be replaced can be performed.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0053] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0054] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0055] The above is a detailed introduction to a low-voltage direct current bypass parallel device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core ideas of the present application. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A low voltage DC bypass parallel device, characterized in that: include: Main circuit and control circuit; The main circuit includes: an incoming line side, a main contactor, and an outgoing line side; both sides of the main contactor are provided with a control coil circuit of an intermediate relay; The control circuit includes: an input and output voltage indication circuit, and a parallel manual and automatic control circuit; the normally closed contact of the intermediate relay is provided in the input and output voltage indication circuit; the normally open contact of the intermediate relay is provided in the parallel manual and automatic control circuit; the control terminal of the main contactor is provided in the parallel manual and automatic control circuit; the input and output voltage indication circuit is provided with a red flashing alarm light; The parallel manual-automatic control circuit includes: a manual mode link, an automatic mode link, and a control terminal of a main contactor; the automatic mode link includes: an automatic mode connection terminal and normally open contacts of two intermediate relays connected in series; the manual mode link includes: a manual mode connection terminal, normally open contacts of two intermediate relays connected in series, and a manual button; When there is no voltage on the outgoing line side, or the voltage is incorrect or the polarity is wrong, the control coil of the intermediate relay is in a non-operating state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in an alarm state, and the parallel manual and automatic control circuit is in a disconnected state; When the outgoing line is correctly wired, the voltage is correct, and the polarity is correct, the control coil of the intermediate relay is in an operative state, the red flashing alarm light of the incoming and outgoing line voltage indicator circuit is in a non-alarm state, and the parallel manual and automatic control circuit is in an on state, so that the load of the DC outgoing line circuit to be replaced can be transferred; When the parallel manual-automatic control circuit is in the on state and the manual mode terminal is connected, the manual button is waited for to be triggered; when the manual button is triggered, the main contactor is actuated so that the outgoing line side is energized, and the load of the DC outgoing line circuit to be replaced is transferred; When the parallel manual automatic control circuit is in the on state and the automatic mode terminal is connected, the main contactor is actuated to energize the outgoing line side and transfer the load of the DC outgoing line circuit to be replaced.

2. The bypass parallel device according to claim 1, characterized in that: The input and output line voltage indication circuit includes: an output line side sound and light alarm circuit and an input and output line indication voltage meter circuit; wherein, the output line side sound and light alarm circuit is provided with the red flashing alarm light and the normally closed contacts of two intermediate relays connected in parallel. When the control coil of the intermediate relay is in a non-actuating state, the red flashing alarm light is in an alarm state.

3. The bypass parallel device according to claim 2, characterized in that: The outgoing line side sound and light alarm circuit is further provided with a sound alarm; when the red flashing alarm light is in the alarm state, the sound alarm sounds an alarm.

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