Low-power-consumption feeder terminal
By designing a low-power power management solution in the feeder terminal, using the combination of LDO_3.3V conversion circuit and lithium battery, the problem of high power consumption of the feeder terminal under the traditional power supply method is solved, and low-power consumption and efficient power management are achieved. Support the promotion of deep fusion circuit breakers.
Patent Information
- Application Number
- CN202420996936.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The traditional power supply method of the primary and secondary column circuit breaker results in high power consumption of the feeder terminal, which cannot meet the low power consumption needs of deep fusion circuit breakers, affecting the normal operation and promotion of equipment.
A low-power feeder terminal was designed, using the main control board, acquisition board, line loss module, 4G module and network port chip, powered by the LDO_3.3V conversion circuit and the capacitor and lithium battery of the circuit breaker on the column are powered by the parallel connection and The lithium battery combination in series, combined with the BOOST_5V core unit, realizes efficient power management and power consumption reduction.
When using the circuit breaker capacitor on the column to get power, the output power is between 6 and 10W, which can meet the normal operation of the feeder terminal, reduce the power consumption of the entire machine, extend the online time, and reduce costs, and support the first and second deep fusion. Promotion of circuit breakers on columns.
Smart Images
Figure CN222321179U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medium-voltage power distribution, and more specifically, relates to a low-power feeder terminal in a complete set of primary and secondary deep-integrated pole-mounted circuit breaker equipment. Background Art
[0002] Traditional primary and secondary pole-mounted circuit breakers use external PTs for power supply. The output power of the external PTs is ≥50VA. Common feeder terminals can operate normally with a power consumption of 12-20W. Deep fusion circuit breakers no longer use external PTs to power feeder terminals. Feeder terminals need to draw power from primary and secondary pole-mounted circuit breakers. Primary and secondary pole-mounted circuit breakers draw power by means of capacitor voltage division inside the pole. Affected by the withstand voltage test and volume of the pole-mounted circuit breaker, the power of the power-drawing capacitor is limited. The single-phase power is generally 5~10W, so this capacitor power-drawing method cannot maintain the normal operation of conventional feeder terminals.
[0003] In order to accelerate the promotion and application of pole-mounted circuit breakers with deep integration of primary and secondary power, it is necessary to reduce the power consumption of the supporting feeder terminals to solve the technical problems existing in the feeder terminals taking power from the pole-mounted circuit breakers. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a low-power feeder terminal, which controls the power consumption of the feeder terminal within the power range of the pole-mounted circuit breaker power supply capacitor, and better adapts to the pole-mounted circuit breaker. The technical solution adopted by the utility model is as follows:
[0005] A low-power feeder terminal includes a main control board and a main control chip, an acquisition board, a line loss module, a 4G module and a network port chip arranged on the main control board. The main control chip is electrically connected to the acquisition board, the line loss module, the 4G module and the network port chip respectively. The acquisition board is electrically connected to the line loss module, and the acquisition mutual inductor is electrically connected to the acquisition board and the line loss module respectively; the main control board is electrically connected to the LDO_3.3V conversion circuit, and the LDO_3.3V conversion circuit supplies power to the main control chip, the acquisition board, the line loss module, the network port chip and the 4G module. The LDO_3.3V conversion circuit is electrically connected to the power supply capacitor, lithium battery power supply module and BOOST_5V core unit of the pole-mounted circuit breaker respectively; the lithium battery power supply module includes a first parallel lithium battery group and a second parallel lithium battery group, the first parallel lithium battery group includes two parallel ninth lithium batteries and tenth lithium batteries, the second parallel lithium battery group includes a first relay to an eighth relay and a first lithium battery to an eighth lithium battery, the first lithium battery to the eighth lithium battery are connected in series in sequence, the first lithium battery to the eighth lithium battery are electrically connected to the first relay to the eighth relay, the first relay and the eighth relay are respectively connected to the actuator of the pole-mounted circuit breaker; the BOOST_5V core unit is electrically connected to the relay coils of the first relay to the eighth relay.
[0006] Preferably, the LDO_3.3V conversion circuit is electrically connected to the power taking capacitor of the pole-mounted circuit breaker through a power switch, and the LDO_3.3V conversion circuit is electrically connected to the lithium battery power supply module and the BOOST_5V core unit through a battery switch.
[0007] Preferably, the ninth lithium battery and the tenth lithium battery, and the first to eighth lithium batteries are all 3.7V lithium batteries.
[0008] Preferably, the first to eighth relays are double-pole double-throw relays.
[0009] Preferably, the line loss module uses an onboard power chip, and the network port chip uses a CH390L chip.
[0010] Beneficial effects of the utility model:
[0011] The utility model can ensure that when the power supply is supplied by the capacitor of the pole-mounted circuit breaker, the output power of 6~10w can meet the normal operation of the feeder terminal and meet the requirements of energy conservation and environmental protection. When the line is powered off, the online time of the feeder terminal can be extended and the life of the feeder terminal can be increased. The feeder terminal originally has a battery, which is a lithium battery or lead-acid battery of about 27V. The utility model only separates the lithium battery for use, and the cost of the relay is not high. The utility model realizes a low-power feeder terminal at a low cost, providing effective technical support for the accelerated promotion of the deep integration of primary and secondary pole-mounted circuit breakers. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0013] Figure 1 It is a schematic diagram of the overall structure of the low-power feeder terminal of the first embodiment of the utility model;
[0014] Figure 2 This is a schematic diagram of the structure and switching principle of the second parallel lithium battery pack of the first embodiment of the utility model;
[0015] Figure 3 It is a schematic diagram of the power supply principle of the low-power feeder terminal in the first embodiment of the utility model. DETAILED DESCRIPTION
[0016] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments. Embodiment 1
[0017] like Figure 1 As shown, a low-power feeder terminal includes a main control board, on which a main control chip, an acquisition board, a line loss module, a 4G module and a network port chip are arranged, the main control chip is electrically connected to the acquisition board, the line loss module, the 4G module and the network port chip respectively, the acquisition board is electrically connected to the line loss module, and the acquisition transformer is electrically connected to the acquisition board and the line loss module respectively. The main control board is electrically connected to the LDO_3.3V conversion circuit, the LDO_3.3V conversion circuit is electrically connected to the power supply capacitor of the pole circuit breaker through the power switch, and the LDO_3.3V conversion circuit is electrically connected to the lithium battery power supply module and the BOOST_5V core unit through the battery switch, and the BOOST_5V core unit is a 3.3V to 5V circuit module inside the feeder terminal.
[0018] The lithium battery power supply module includes a first parallel lithium battery group and a second parallel lithium battery group, and the first parallel lithium battery group and the second parallel lithium battery group are both electrically connected to the LDO_3.3V conversion circuit through a battery switch. The first parallel lithium battery group includes two parallel 3.7V ninth lithium battery and tenth lithium battery, and uses a 3.3V power supply to charge the 3.7V lithium battery to a maximum of 3.3V. The second parallel lithium battery group includes a first relay JD1 to an eighth relay JD8 and a 3.7V first lithium battery B1 to an eighth lithium battery B8, such as Figure 2 As shown, pin 9 of the first relay JD1 is connected to the positive electrode of the first lithium battery B1, pin 4 of JD1 is connected to the negative electrode of B1, pin 10 of JD1 is connected to the 3.3V positive voltage of the LDO_3.3V conversion circuit, pin 3 of JD1 is connected to the 3.3V negative voltage of the LDO_3.3V conversion circuit, pin 12 and pin 1 of JD1 are relay coils, and the BOOST_5V power supply is controlled by the main control chip to control the power on and off of the JD1 coil. Pin 5 of JD1 is connected to pin 8 of the second relay JD2, pin 5 of JD2 is connected to pin 8 of the third relay JD3, pin 5 of JD3 is connected to pin 8 of the fourth relay JD4, pin 5 of JD4 is connected to pin 8 of the fifth relay JD5, pin 5 of JD5 is connected to pin 8 of the sixth relay JD6, pin 5 of JD6 is connected to pin 8 of the seventh relay JD7, pin 5 of JD7 is connected to pin 8 of the eighth relay JD8, pin 8 of JD1 and pin 5 of JD8 are respectively connected to the actuator of the pole-mounted circuit breaker, JD1~JD8 control B1~B8 to be connected in series and parallel, and provide 26.4V positive and negative voltages for the actuator of the pole-mounted circuit breaker. The connection method of the remaining pins of JD2, JD3, JD4, JD5, JD6, JD7 and JD8 is the same as that of the remaining pins of JD1, which will not be repeated here.
[0019] The BOOST_5V core unit is electrically connected to the relay coils of the first relay JD1 to the eighth relay JD8. In the embodiment of the utility model, the BOOST_5V core unit controls the relay coils (pins 12 and 1 of each) of JD1, JD2...JD8 to realize the closing or release of the relays JD1~JD8. When the relays JD1~JD8 are in the released state, 8 lithium batteries are connected in parallel and output a voltage of 3.3V. When the relays JD1~JD8 are in the closed state, 8 lithium batteries are connected in series and output a voltage of 26.4V.
[0020] like Figure 3 As shown, the low power consumption feeder terminal of the first embodiment of the utility model has the following working principle:
[0021] The existing feeder terminal power supply scheme first passes through the battery management module and then outputs a 24V DC signal. The battery management module steps down the voltage and the static power consumption loss is 15%. The battery management module provides it to the DCDC module. The DCDC module realizes 24V input and output. The 5V output of the main control board also loses 10% of the static power. With the low-power feeder terminal of the embodiment of the utility model, the internal power supply capacitor of the pole-mounted circuit breaker is directly connected to the LDO_3.3V conversion circuit of the feeder terminal, reducing the current intermediate link DCDC conversion power loss by 25%.
[0022] Under normal power supply conditions, the power provided by the capacitor is stepped down to 3.3V voltage after passing through the LDO_3.3V conversion circuit. One way is to supply power to the main control board to ensure the normal operation of the main control board, and the other way is to supply power to the lithium battery power supply module and the BOOST_5V core unit through the battery switch to charge the lithium battery. The lithium battery power supply module is divided into two groups, one group is the first parallel lithium battery group consisting of two parallel 3.7V lithium batteries, and the other group is the second parallel lithium battery group consisting of eight 3.7V lithium batteries B1~B8. The second parallel lithium battery group uses double-pole double-throw relays JD1~JD8 to achieve series-parallel switching of the eight backup lithium batteries B1~B8. When a line fault occurs and needs to be opened and closed, the two 3.7V ninth lithium batteries and the tenth lithium batteries remain in parallel (that is, the first parallel lithium battery group is powered normally), and the other eight parallel lithium batteries B1~B8 are controlled by relays JD1~JD8 to achieve series connection to form a 26.4V voltage. The pole-mounted circuit breaker realizes electrical connection and data exchange with the feeder terminal through aviation plugs and leads. An actuator is arranged in the pole-mounted circuit breaker, and the actuator includes an opening mechanism and a closing mechanism. The feeder terminal outputs a voltage control signal to control the actuator in the pole-mounted circuit breaker to perform opening and closing actions.
[0023] The low-power feeder terminal of the utility model embodiment uses a first parallel lithium battery pack connected in parallel to realize static power supply, and a second parallel lithium battery pack connected in series with 26.4V to realize power supply for the pole-mounted circuit breaker actuator, which can keep the feeder terminal at a low voltage of 3.3V under normal conditions, and reduce the power consumption of the whole machine by 10%. When the external power supply is cut off, the lithium battery power supply module reversely supplies power to the main control board and the control circuit.
[0024] In summary, the existing feeder terminal needs at least 12W power supply to work properly. With the low-power feeder terminal of the embodiment of the utility model, a power supply of more than 5W can work properly. Embodiment 2
[0025] On the basis of the first embodiment, the hardware of each component module of the feeder terminal adopts low-power devices. When the line is in normal state, the main control chip turns on the low-power mode, and the power consumption can be reduced from the original 0.3w to 0.1w; the line loss module is changed from the original external acquisition module to the onboard power chip, and the acquisition transformer is shared with the acquisition board. The main control chip collects and calculates by itself, reducing the power supply and peripheral circuits, and the power consumption is reduced from the original 1.6w to 0.5w; the network port chip is changed from the original DM9000 chip to the CH390L chip, and the power consumption of the two-way network port chip is reduced from 0.7w to 0.4w; the 4G module is set to low-power operation mode, which can reduce power consumption by 0.8w. According to the normal and fault status of the 10kV line, the feeder terminal can dynamically adjust the opening and closing of certain functional modules, and the comprehensive power consumption of long-term operation can be reduced by about 0.5w.
[0026] In the embodiments of the utility model, the technical features not described in detail are all existing technologies or conventional technical means and will not be described in detail here.
[0027] Finally, it should be noted that the above embodiments are only specific implementation methods of the present utility model, which are used to illustrate the technical solution of the present utility model, rather than to limit it, and the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solution recorded in the above embodiments within the technical scope disclosed by the present utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present utility model, and should be covered within the protection scope of the present utility model.
Claims
1. A low-power feeder terminal, comprising a main control board and a main control chip, a collection board, a line loss module, a 4G module and a network port chip arranged on the main control board, wherein the main control chip is electrically connected to the collection board, the line loss module, the 4G module and the network port chip respectively, the collection board is electrically connected to the line loss module, and the collection transformer is electrically connected to the collection board and the line loss module respectively, characterized in that: The main control board is electrically connected to the LDO_3.3V conversion circuit, and the LDO_3.3V conversion circuit is electrically connected to the power supply capacitor, lithium battery power supply module and BOOST_5V core unit of the pole circuit breaker respectively; the lithium battery power supply module includes a first parallel lithium battery group and a second parallel lithium battery group in parallel, the first parallel lithium battery group includes two parallel ninth lithium batteries and tenth lithium batteries, the second parallel lithium battery group includes a first relay to an eighth relay and a first lithium battery to an eighth lithium battery, the first lithium battery to the eighth lithium battery are connected in series in sequence, the first lithium battery to the eighth lithium battery are electrically connected to the first relay to the eighth relay respectively, and the first relay and the eighth relay are respectively connected to the actuator of the pole circuit breaker; the BOOST_5V core unit is electrically connected to the relay coils of the first relay to the eighth relay respectively.
2. The low power consumption feeder terminal according to claim 1, characterized in that: The LDO_3.3V conversion circuit is electrically connected to the power-taking capacitor of the column-mounted circuit breaker through a power switch, and the LDO_3.3V conversion circuit is electrically connected to the lithium battery power supply module and the BOOST_5V core unit through a battery switch.
3. The low power consumption feeder terminal according to claim 2, characterized in that: The ninth lithium battery and the tenth lithium battery, and the first lithium battery to the eighth lithium battery all use 3.7V lithium batteries.
4. The low power consumption feeder terminal according to claim 3, characterized in that: The first to eighth relays use double-pole double-throw relays.
5. The low power consumption feeder terminal according to any one of claims 1 to 4, characterized in that: The line loss module uses an onboard power chip, and the network port chip uses a CH390L chip.