Low-voltage direct-current bypass paralleling device

Abstract

The invention discloses a low-voltage direct-current bypass paralleling device which comprises a main loop and a control loop. The main loop comprises a wire inlet side, a main contactor and a wire outlet side; control coil loops of the intermediate relay are arranged on the two sides of the main contactor; the control loop comprises an incoming and outgoing line side voltage indication loop and a parallel manual and automatic control loop; when there is no voltage at the wire outlet side or the voltage is incorrect or the polarity is wrong, the control coil of the intermediate relay is in a non-action state, the red flashing alarm lamp of the voltage indication loop at the wire inlet and outlet side is in an alarm state, and the parallel control loop is in a disconnected state. And when the wiring at the wire outlet side is correct, and the voltage and the polarity are correct, the control coil of the intermediate relay is in an action state, the red flashing alarm lamp of the voltage indication loop at the wire inlet and outlet side is in a non-alarm state, and the parallel control loop is in a switch-on state, so that the load transfer of the direct-current wire outlet loop to be replaced can be carried out.

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, low-voltage DC systems in substations, power plants and other plants are of vital importance. However, there are some problems with existing low-voltage DC systems. Generally, the electrical life of low-voltage DC equipment is 10-15 years. When the service life is approaching, the low-voltage DC system of the entire station needs to be transformed. In the traditional replacement process, if the operation is to be carried out without powering off the feeder, there will be many difficulties.

[0003] In the related art, each DC feeder to be transferred needs to be manually checked for positive and negative poles, which requires two people to work together, one of whom is responsible for the check. This process is not only cumbersome, but also time-consuming and labor-intensive. If you choose to replace the low-voltage DC system during a power outage, for intervals with a single set of protection devices, the interval must be accompanied by the protection being stopped and withdrawn to replace the power supply line of the device, which will undoubtedly have a negative impact on the reliability of power supply. For intervals with dual protection configurations, it is necessary to withdraw the protection in turn to replace the power supply line of the device. In this way, the amount of operation is greatly increased, and the operability becomes poor.

[0004] It can be seen that how to improve the efficiency of the replacement process and avoid excessive operation during the replacement by two persons 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 requirements of the prior art, the present invention provides a low-voltage direct current bypass parallel device, including: 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 / output line voltage indication circuit and a parallel manual automatic control circuit; the normally closed contact of the intermediate relay is arranged in the input / output line voltage indication circuit; the normally open contact of the intermediate relay is arranged in the parallel manual automatic control circuit; the control end of the main contactor is arranged in the parallel manual automatic control circuit; the input / output line 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-actuated state, the red flashing alarm light of the incoming and outgoing line voltage indication circuit is in an alarm state, and the parallel control circuit is in a disconnected state;

[0010] 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 actuating 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 an on state, so as to transfer the load 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 operates 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 to transfer the load of the DC outgoing line circuit to be replaced.

[0013] Optionally, the voltage indicating circuit on the incoming and outgoing line side comprises: an outgoing line side sound and light alarm circuit and an incoming and outgoing line indicating voltage meter circuit; wherein, the outgoing 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-actuated 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 a main contactor; the automatic mode link includes: an automatic mode terminal, and normally open contacts of two intermediate relays connected in series; the manual mode link includes: a manual mode terminal, 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 arranged in the incoming and outgoing line side voltage indication circuit; the normally open contact of the intermediate relay is arranged in the parallel manual and automatic control circuit; the control end of the main contactor is arranged 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 indication 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-actuated state, the red flashing alarm light of the voltage indication circuit on the incoming and outgoing line side is in an alarm state, and the parallel control circuit is in a disconnected state; when the outgoing line side is correctly wired, and the voltage and polarity are correct, the control coil of the intermediate relay is in an acted state, the red flashing alarm light of the voltage indication circuit on the incoming and outgoing line side is in a non-alarm state, and the parallel control circuit is in a connected state, so as to transfer the load 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, there is no need for manual verification, saving manpower and time costs. The automated detection process not only improves work efficiency, but also reduces the possibility of human error, making the operation more accurate and reliable. In addition, it avoids the potential safety hazards caused by manual verification and enhances the stability of the entire system, making the device more practical and safer in actual applications, and providing great convenience for 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure 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 purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain 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 can be combined with each other as long as they do not conflict with each other.

[0024] A low voltage direct current bypass parallel device provided by the present application is described below 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] A main circuit 10 and a 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 20; the normally closed contact of the intermediate relay is arranged in the input / output line voltage indication circuit; the normally open contact of the intermediate relay is arranged in the parallel manual automatic control circuit 20; the control end of the main contactor is arranged in the parallel manual automatic control circuit 20; the input / output line voltage indication circuit is arranged with a red flashing alarm light;

[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-actuated state, the red flashing alarm light of the voltage indicator circuit on the incoming and outgoing line side is in an alarm state, and the parallel control circuit 20 is in a disconnected state;

[0031] 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 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 20 is in the on state, so as to transfer the load of the DC outgoing line circuit to be replaced.

[0032] In the main circuit 10, the incoming line side is connected to the power supply, and the outgoing line side is connected to the DC outgoing line circuit to be replaced. The main contactor plays the role of connecting or disconnecting the circuit, and the control coil circuits of the intermediate relays on both sides are used to detect the voltage and polarity of the outgoing line side.

[0033] In the control circuit 20, the voltage indication circuit on the input and output sides is connected to the red flashing alarm light through the normally closed contact of the intermediate relay. When there is no voltage on the output side, the voltage is incorrect or the polarity is wrong, the control coil of the intermediate relay does not work, and the normally closed contact remains closed, so that the red flashing alarm light is energized and sends out an alarm signal. At the same time, the parallel control circuit 20 is in a disconnected state to avoid erroneous load transfer.

[0034] When the outgoing line is correctly wired, the voltage is correct, and the polarity is correct, the control coil of the intermediate relay is activated and the normally open contact is closed. At this time, the red flashing alarm light of the voltage indicator circuit on the incoming and outgoing line goes out, indicating that the circuit is in a normal state and the parallel control circuit 20 is connected. After the control end of the main contactor receives the signal, the main contactor is activated to energize the outgoing line, thereby realizing the load transfer of the DC outgoing line circuit to be replaced.

[0035] The device can automatically and accurately determine the state of the outgoing line side and perform corresponding control operations based on the determination results. Through the switching of the intermediate relay, accurate monitoring and control of the circuit state is achieved, ensuring the safety and reliability of load transfer. At the same time, this principle also makes the operation of the device easier, 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 the device is based on the detection of the voltage and polarity on the outgoing line side, and the voltage indication on the incoming and outgoing line side and the state switching of the parallel control circuit 20 are realized through the control of the intermediate relay, thereby ensuring the safety, reliability and efficiency of the low-voltage DC bypass parallel process.

[0037] In summary, this embodiment automatically detects the voltage and polarity of the outgoing line side without manual verification, thus saving manpower and time costs. The automated detection process not only improves work efficiency, but also reduces the possibility of human error, making the operation more accurate and reliable. In addition, it avoids the potential safety hazards caused by manual verification, enhances the stability of the entire system, and makes the device more practical and safe in practical applications, providing great convenience for the replacement and maintenance of low-voltage DC systems.

[0038] Optionally, when the parallel control circuit 20 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 20 is in the on state and the manual mode terminal is connected. At this time, the device will wait for the manual button to be triggered. When the manual button is triggered, the main contactor will operate to make the outlet side energized, thereby transferring the load of the DC outlet circuit to be replaced. This manual control mode provides operators with more flexible operation options. In specific circumstances, manual operation can be performed according to actual needs, which increases the operability and applicability of the device.

[0040] Optionally, when the parallel control circuit 20 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 to transfer the load of the DC outgoing line circuit to be replaced.

[0041] This claim states that when the parallel control circuit 20 is in the on state and the automatic mode terminal is connected, the main contactor will automatically operate to energize the outlet side, thereby realizing the load transfer of the DC outlet circuit to be replaced. This automatic mode can greatly improve work efficiency and reduce manual intervention, and is particularly suitable for scenarios with high requirements for operational timeliness. The setting of the automatic mode enables the device to operate more intelligently and improves the automation level of the system.

[0042] Optionally, the voltage indication circuit on the incoming and outgoing line side includes: an outgoing line side sound and light alarm circuit and an incoming and outgoing line indicating voltage meter circuit; wherein, the outgoing line side sound and light alarm circuit is provided with a red flashing alarm light and normally closed contacts of two intermediate relays in parallel, and 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 composition of the voltage indication circuit on the incoming and outgoing lines, including the sound and light alarm circuit on the outgoing line and the voltage meter circuit on the incoming and outgoing lines. The sound and light alarm circuit on the outgoing line is provided with a red flashing alarm light and two normally closed contacts of parallel intermediate relays. When the control coil of the intermediate relay is in a non-actuated state, the red flashing alarm light is in an alarm state. This design enables the operator to promptly understand the abnormal situation on the outgoing line side through intuitive sound and light alarm signals, so as to take corresponding measures and ensure the safe operation of the system.

[0044] Optionally, the parallel manual-automatic control circuit 20 includes: a manual mode link, an automatic mode link, and a control end of a main contactor; the automatic mode link includes: an automatic mode terminal, and normally open contacts of two intermediate relays connected in series; the manual mode link includes: a manual mode terminal, normally open contacts of two intermediate relays connected in series, and a manual button.

[0045] The claim elaborates on the composition of the parallel manual-automatic control circuit 20, including the manual mode link, the automatic mode link and the control end of the main contactor. The automatic mode link includes the automatic mode terminal and the normally open contacts of two intermediate relays in series, and the manual mode link includes the manual mode terminal, the normally open contacts of two intermediate relays in series and the manual button. This design allows the manual mode and the automatic mode to be clearly separated and run independently, while at the same time achieving flexible control through the switching of the intermediate relays, meeting the operation requirements in different 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 requires the addition of a sound alarm to the sound and light alarm circuit on the outgoing line side. When the red flashing alarm light is in the alarm state, the sound alarm will sound an alarm, further enhancing the alarm effect, ensuring that the operator can detect abnormal conditions on the outgoing line side more promptly, and improving the safety and reliability of the system. The addition of the sound alarm makes the alarm information more obvious and prominent, effectively reminding the operator to pay attention and take corresponding measures.

[0048] Furthermore, a 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 parallel device in this embodiment is divided into a main circuit 10 and a control circuit 20. The main circuit 10 is composed of three parts: the incoming line side, the main contactor, and the outgoing line side; the control circuit 20 includes the incoming and outgoing line side voltage and indication circuit and the parallel manual and automatic control circuit 20. When there is no voltage on the outgoing line side, the voltage is incorrect or the polarity is wrong, the red flashing alarm light alarms, and the parallel control circuit 20 is disconnected at this time. When the outgoing line side is correctly connected, the voltage and polarity are correct, the flashing buzzer light does not alarm, and the parallel control circuit 20 is connected at this time. The manual and automatic parallel mode can be selected. After the main contactor is activated, the outgoing line side is energized. After the main contactor is activated, the outgoing line side is energized, and the load transfer work of the DC outgoing line circuit to be replaced can be carried out.

[0052] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part 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 composition and steps of each example have been generally described in the above description according to function. 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 to be beyond the scope of this application.

[0054] The steps of the method or algorithm 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 a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, 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 in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, 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 direct current 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 / output line voltage indication circuit and a parallel manual automatic control circuit; the normally closed contact of the intermediate relay is arranged in the input / output line voltage indication circuit; the normally open contact of the intermediate relay is arranged in the parallel manual automatic control circuit; the control end of the main contactor is arranged in the parallel manual automatic control circuit; the input / output line voltage indication circuit is provided with a red flashing alarm light; 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-actuated state, the red flashing alarm light of the incoming and outgoing line voltage indication circuit is in an alarm state, and the parallel 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 actuating 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 an on state, so as to transfer the load of the DC outgoing line circuit to be replaced.

2. The bypass parallel device according to claim 1, characterized in that: 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.

3. The bypass parallel device according to claim 2, characterized in that: When the parallel control circuit is in the on state and the automatic mode terminal is connected, 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.

4. The bypass parallel device according to claim 3, characterized in that: The voltage indicating circuit on the incoming and outgoing lines includes: an outgoing line side sound and light alarm circuit and an incoming and outgoing line indicating voltage meter circuit; wherein, the outgoing line side sound and light alarm circuit is provided with the red flashing alarm light and the normally closed contacts of two parallel intermediate relays, and when the control coil of the intermediate relay is in a non-actuated state, the red flashing alarm light is in an alarm state.

5. The bypass parallel device according to claim 4, characterized in that: The parallel manual-automatic control circuit includes: a manual mode link, an automatic mode link, and a control end of a main contactor; the automatic mode link includes: an automatic mode wiring terminal and normally open contacts of two intermediate relays connected in series; the manual mode link includes: a manual mode wiring terminal, normally open contacts of two intermediate relays connected in series, and a manual button.

6. The bypass parallel device according to claim 5, characterized in that: The outgoing line side sound and light alarm circuit is also 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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