A power distribution terminal battery under-voltage on-line monitoring device and method

Abstract

The application discloses a kind of power distribution terminal battery underpressure online monitoring device and method, the device includes: AC power contact module, open-circuit voltage monitoring relay module and operating module;Open-circuit voltage monitoring relay module includes: AC time-delay relay, AC power-off lockout relay, local start relay, detection execution relay and DC underpressure relay.The method includes: by operating module selects automatic or manual monitoring function;When selecting automatic monitoring function, the action switch of AC time-delay relay is closed after preset time or when selecting manual monitoring function, the action switch of local start relay is closed;Detection execution relay is opened, and open-circuit breakpoint is formed in the loop of DC charger and battery;When the open-circuit voltage of battery is less than the voltage threshold of DC underpressure relay, the action switch of DC underpressure relay is closed to carry out battery underpressure alarm.The application measures battery open-circuit voltage in time and accurately.

Description

Technical Field

[0001] This invention relates to the field of battery undervoltage monitoring technology, and in particular to an online monitoring device and method for battery undervoltage in a power distribution terminal. Background Technology

[0002] Distribution terminals are key devices that support the digital panoramic perception of the distribution network and its intelligent control and maintenance. To ensure that the distribution terminal can continuously provide an "observable, measurable, and controllable" digital dispatch and command environment within a certain time frame after the main power supply fails, each distribution terminal is equipped with a 24V valve-regulated lead-acid battery and power management module as a backup power system. If the battery fault is not detected in time, the distribution terminal will lose power when the distribution network line is cut off, causing the "three-remote" information interaction, remote control, self-healing logic, and other protection automation functions to be unable to function properly, and the distribution network control will be in a state of "blind monitoring" and "blind adjustment". Therefore, battery status monitoring and early warning are of great significance to the full utilization of the distribution terminal's effectiveness and the safe and stable operation of the distribution network. Summary of the Invention

[0003] This invention provides an online monitoring device and method for undervoltage of power distribution terminal batteries to solve the problem that existing technologies cannot detect undervoltage of power distribution terminal batteries in a timely manner.

[0004] In a first aspect, a power distribution terminal battery undervoltage online monitoring device is provided, comprising: an AC power contact module, an open circuit voltage monitoring relay module, and an operation module;

[0005] The open-circuit voltage monitoring relay module includes: an AC time-delay relay, an AC power failure lockout relay, a local start relay, a detection and execution relay, and a DC undervoltage relay.

[0006] One end of the AC power contact module is used to connect to an AC power source; the other end of the AC power contact module is respectively connected to the live wire port and the neutral wire port of the AC power failure lockout relay, one end of the operating switch of the AC power failure lockout relay, the neutral wire port of the AC time delay relay, the neutral wire port of the local start relay, the neutral wire port of the detection execution relay, and one end of the operation module.

[0007] The live wire port of the AC time delay relay and the live wire port of the local start relay are respectively connected to the other end of the operation module, so that the operation module is used to control the access of the AC time delay relay or the local start relay. The operating switch of the AC time delay relay and the operating switch of the local start relay are connected in parallel to form a first parallel circuit. The two ends of the first parallel circuit are respectively connected to the other end of the operating switch of the AC power failure lockout relay and the live wire port of the detection execution relay.

[0008] The action switch of the detection execution relay is connected in series in the connection circuit between the DC charger and the battery;

[0009] The live wire and neutral wire ports of the DC undervoltage relay are both connected in series in the connection circuit between the DC charger and the battery.

[0010] In a second aspect, a method for online monitoring of undervoltage in a power distribution terminal battery is provided, wherein the monitoring is performed using the online monitoring device for undervoltage in a power distribution terminal battery as described in the first aspect embodiment above, and the method includes:

[0011] When the power distribution terminal battery undervoltage online monitoring device is powered on, the automatic monitoring function or the manual monitoring function can be selected through the operation module;

[0012] When the automatic monitoring function is selected, the action switch of the AC time delay relay is closed after a preset time; or, when the manual monitoring function is selected, the action switch of the local start relay is closed.

[0013] Disconnect the action switch of the detection execution relay to create an open circuit power failure in the connection circuit between the DC charger and the battery, so as to meet the battery open circuit voltage detection condition.

[0014] When the open-circuit voltage of the battery is less than the preset voltage threshold of the DC undervoltage relay, the operating switch of the DC undervoltage relay is closed to trigger a battery undervoltage alarm.

[0015] Thus, in this embodiment of the invention, by adding a disconnection point between the charger and the battery and connecting a detection and execution relay, the open-circuit voltage of the battery can be measured in a timely and accurate manner. When performing manual monitoring, there is no need to manually disconnect the charger's input to the battery, making the operation process simpler and safer, and significantly shortening the operation time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a circuit diagram of the AC section of the online monitoring device for undervoltage of the power distribution terminal battery according to an embodiment of the present invention;

[0018] Figure 2 This is a circuit diagram of the DC section of the online monitoring device for undervoltage of the power distribution terminal battery according to an embodiment of the present invention;

[0019] Figure 3 This is a flowchart of the online monitoring method for undervoltage of a power distribution terminal battery according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention discloses an online monitoring device for undervoltage of a power distribution terminal battery. For example... Figures 1-2 As shown, the device includes the following structure: an AC power contact module, an open-circuit voltage monitoring relay module, and an operation module.

[0022] Specifically, the open-circuit voltage monitoring relay module includes: AC time delay relay KT, AC power failure lockout relay KM1, local start relay KM2, detection execution relay KM3, and DC undervoltage relay.

[0023] One end of the AC power contact module is used to connect to the AC power source; the other end of the AC power contact module is connected to the live wire port KM1-L and the neutral wire port KM1-N of the AC power failure lockout relay KM1, one end of the operating switch K1 of the AC power failure lockout relay KM1, the neutral wire port KT-N of the AC time delay relay KT, the neutral wire port KM2-N of the local start relay KM2, the neutral wire port KM3-N of the detection and execution relay KM3, and one end of the operation module.

[0024] In this circuit, the live wire port KT-L of the AC time-delay relay KT and the live wire port KM2-L of the local start relay KM2 are respectively connected to the other end of the operating module, enabling the operating module to control the connection of either the AC time-delay relay KT or the local start relay KM2. The operating switch T1 of the AC time-delay relay KT and the operating switch K2 of the local start relay KM2 are connected in parallel to form the first parallel circuit, making this part of the circuit an AC power failure interlock monitoring circuit. The two ends of the first parallel circuit are respectively connected to the other end of the operating switch K1 of the AC power failure interlock relay KM1 and the live wire port KM3-L of the detection execution relay KM3. The operating switch K1 of the AC power failure interlock relay KM1 is a normally closed switch.

[0025] The action switch of the detection and execution relay KM3 is connected in series in the connection circuit between the DC charger and the battery. Preferably, the action switch of the detection and execution relay KM3 includes: a first action switch K3-1 and a second action switch K3-2. The first action switch K3-1 is connected in series in the positive terminal of the connection circuit between the DC charger and the battery, and the second action switch K3-2 is connected in series in the negative terminal of the connection circuit between the DC charger and the battery. The first action switch K3-1 and the second action switch K3-2 are simultaneously open or closed.

[0026] In this case, both the live wire port and the neutral wire port of the DC undervoltage relay are connected in series in the connection circuit between the DC charger and the battery.

[0027] With the above structural design, when the power distribution terminal battery undervoltage online monitoring device is powered on, it can be switched to AC time delay relay KT or local start relay KM2 through the operation module, thereby realizing automatic or manual monitoring of battery voltage.

[0028] Specifically, the AC power contact module includes: a first switch ZK-1 and a second switch ZK-2. Both switches ZK-1 and ZK-2 can be air switches. Both switches ZK-1 and ZK-2 can be simultaneously open or closed. One end of the first switch ZK-1 is connected to the live wire (L) of the AC power supply, and one end of the second switch ZK-2 is connected to the neutral wire (N) of the AC power supply. The other end of the first switch ZK-1 is connected to the live wire port KM1-L of the AC power failure lockout relay KM1, one end of the operating switch K1 of the AC power failure lockout relay KM1, and one end of the operating module. The other end of the second switch ZK-2 is connected to the neutral wire port KM1-N of the AC power failure lockout relay KM1, the neutral wire port KT-N of the AC time delay relay KT, the neutral wire port KM2-N of the local start relay KM2, and the neutral wire port KM3-N of the detection and execution relay KM3.

[0029] Specifically, the operating module is a two-position changeover switch KK. One end of the two-position changeover switch KK is connected to the other end of the first switch ZK-1. The first position contact ZB-2 of the other end of the two-position changeover switch KK is connected to the live wire port KT-L of the AC time delay relay KT. The second position contact ZB-4 of the other end of the two-position changeover switch KK is connected to the live wire port KM2-L of the local start relay KM2.

[0030] Preferably, a manual test push-button switch SB1 is connected between the second position contact ZB-4 at the other end of the two-position changeover switch KK and the live wire port KM2-L of the local start relay KM2. The manual test push-button switch SB1 is a normally open switch.

[0031] Preferably, the open-circuit voltage monitoring relay module further includes: a signal self-holding relay KM4. The DC undervoltage relay includes: a first DC undervoltage relay KV1. The first operating switch K4-1 of the signal self-holding relay KM4 and the operating switch KV1-1 of the first DC undervoltage relay KV1 are connected in parallel to form a second parallel circuit. The live wire port KM4-L of the signal self-holding relay KM4 is connected to one end of the second parallel circuit, and the other end of the second parallel circuit is connected to one end of the signal reset button switch SB2. The other end of the signal reset button switch SB2 is connected to the other end of the first switch ZK-1. The signal reset button switch SB2 is a normally closed switch. The neutral wire port KM4-N of the signal self-holding relay KM4 is connected to the other end of the second switch ZK-2. The second operating switch K4-2 of the signal self-holding relay KM4 is used to connect to the remote signaling interface of the distribution terminal (DTU), so that this part of the circuit forms a signal self-holding circuit. The live wire port KV1-L of the first DC undervoltage relay KV1 is connected to the positive terminal of the connection circuit between the DC charger and the battery, and the neutral wire port KV1-N of the first DC undervoltage relay KV1 is connected to the negative terminal of the connection circuit between the DC charger and the battery.

[0032] By adding a signal self-holding relay KM4, alarm signals can be continuously sent to the power distribution terminal.

[0033] Preferably, the device further includes: a battery undervoltage indicator module 2HL. The battery undervoltage indicator module 2HL can be an indicator light. The DC undervoltage relay includes: a second DC undervoltage relay KV2. The two ends of the operating switch KV2-1 of the second DC undervoltage relay KV2 are respectively connected to one end of the battery undervoltage indicator module 2HL and the other end of the first switch ZK-1, and the other end of the battery undervoltage indicator module 2HL is connected to the other end of the second switch ZK-2. The live wire port KV2-L of the second DC undervoltage relay KV2 is connected to the positive terminal of the connection circuit between the DC charger and the battery, and the neutral wire port KV2-N of the second DC undervoltage relay KV2 is connected to the negative terminal of the connection circuit between the DC charger and the battery.

[0034] By adding a battery undervoltage indicator module 2HL, a report can be made when the battery is undervoltage detected.

[0035] Preferably, the device further includes a power indicator module 1HL. The power indicator module 1HL may be an indicator light. One end of the power indicator module 1HL is connected to the other end of the first switch ZK1, and the other end of the power indicator module 1HL is connected to the other end of the second switch ZK2.

[0036] By adding a working power indicator module 1HL, a report can be made after the entire device is powered on.

[0037] Preferably, the device further includes a voltage monitoring display screen XS. The live wire port XS-L of the voltage monitoring display screen XS is connected to the positive terminal of the connection circuit between the DC charger and the battery, and the neutral wire port XS-N of the voltage monitoring display screen XS is connected to the negative terminal of the connection circuit between the DC charger and the battery.

[0038] By adding a voltage monitoring display screen XS, the monitored battery voltage data can be displayed in real time.

[0039] The aforementioned online monitoring device for undervoltage batteries in power distribution terminals allows maintenance personnel to monitor battery undervoltage alarm signals and voltage values ​​via the power distribution master station through automatic monitoring. This enables centralized monitoring of battery status, allowing maintenance personnel to be notified on-site to troubleshoot when an alarm signal is received. Alternatively, manual monitoring is available. When maintenance personnel are on-site to further test the battery open-circuit voltage, the battery charging circuit needs to be manually disconnected to measure the open-circuit voltage, further confirming whether the battery undervoltage condition actually exists and whether it is a false signaling error.

[0040] This invention also discloses an online monitoring method for undervoltage of a distribution terminal battery, characterized in that it uses the online monitoring device for undervoltage of the distribution terminal battery as described in the above embodiments. Specifically, as... Figure 3 As shown, the method includes the following steps:

[0041] Step S101: After the power distribution terminal battery undervoltage online monitoring device is powered on, select the automatic monitoring function or the manual monitoring function through the operation module.

[0042] The device's automatic monitoring function is mainly achieved through an AC time-delay relay KT. Specifically, turning the two-position selector switch KK to the first position and closing contact ZB-2 activates the device's automatic monitoring function.

[0043] The manual monitoring function, as a supplement to the automatic monitoring function, allows maintenance personnel to quickly obtain the battery open-circuit voltage upon arrival at the site. This is used to further confirm whether the battery undervoltage condition actually exists and whether it is a false remote signaling. Specifically, turn the two-position selector switch KK to the second position where contact ZB-4 is closed, and press the manual detection button switch SB1 to activate the manual detection function.

[0044] Step S102: When the automatic monitoring function is selected, the action switch of the AC time delay relay is closed after a preset time; or, when the manual monitoring function is selected, the action switch of the local start relay is closed.

[0045] For the automatic monitoring function, the self-start time of the AC time delay relay KT is preset. After the self-start time is reached, the action switch T1 of the AC time delay relay KT closes.

[0046] For the manual monitoring function, close the action switch K2 of the local start relay KM2.

[0047] Step S103: Disconnect the action switch of the detection execution relay to create an open circuit in the connection circuit between the DC charger and the battery, thereby satisfying the open circuit voltage detection condition of the battery.

[0048] Specifically, whether it is the automatic monitoring function or the manual monitoring function, the first action switch K3-1 and the second action switch K3-2 of the detection execution relay KM3 are open, which meets the detection conditions of the battery open circuit voltage.

[0049] Step S104: When the open circuit voltage of the battery is less than the preset voltage threshold of the DC undervoltage relay, close the operating switch of the DC undervoltage relay to trigger a battery undervoltage alarm.

[0050] Specifically, the first DC undervoltage relay KV1 and the second DC undervoltage relay KV2 monitor the battery voltage. Preset voltage thresholds are set for both relays (generally, these thresholds are the same). When the actual monitored voltage is lower than the preset threshold, the operating switches KV1-1 and KV2-1 of both relays close to trigger a battery undervoltage alarm. Specifically, the closing of the operating switch KV2-1 of the second DC undervoltage relay KV2 activates the battery undervoltage indicator module 2HL, alerting on-site maintenance personnel. The closing of the operating switch KV1-1 of the first DC undervoltage relay KV1 allows the alarm signal to be transmitted via the distribution terminal to the battery voltage online monitoring platform at the distribution master station, enabling remote maintenance personnel to receive the alarm.

[0051] Preferably, since neither the automatic nor manual monitoring functions can maintain a continuous uploading of the undervoltage signal to the distribution master station, the signal stops being transmitted after the monitoring process ends. To prevent maintenance personnel from missing alarm signals due to short signal retention time, the above-mentioned device embodiment incorporates a signal self-holding circuit in the AC circuit. Based on this signal self-holding circuit, the method of this embodiment further includes:

[0052] Close the operating switch KV1-1 of the first DC undervoltage relay KV1, and close the first operating switch K4-1 and the second operating switch K4-2 of the signal self-holding relay KM4, keeping the signal self-holding relay KM4 constantly energized and continuously sending alarm signals. Maintenance personnel can manually operate the signal reset button switch SB2 on-site to open the switch, stopping power supply to the signal self-holding relay KM4 and canceling signal transmission.

[0053] The power distribution terminal is normally powered by AC power, and is powered by a battery when the AC power is lost. To prevent power loss due to device activation monitoring during battery power supply, the device has a power failure interlock function. Preferably, the method of this embodiment further includes:

[0054] When the AC power supply fails, the operating switch K1 of the AC power failure lockout relay KM1 is disconnected, rendering the AC relay unusable and thus preventing the detection and execution relay KM3 from operating and disconnecting the battery power supply circuit.

[0055] In summary, by adding a disconnection point between the charger and the battery and connecting a detection and execution relay, the open-circuit voltage of the battery can be measured in a timely and accurate manner. When performing manual monitoring, there is no need to manually disconnect the charger's input to the battery, making the operation process simpler, safer, and significantly reducing the operation time.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A power distribution terminal battery undervoltage online monitoring device, characterized in that, include: AC power contact module, open-circuit voltage monitoring relay module, and operation module; The open-circuit voltage monitoring relay module includes: an AC time-delay relay, an AC power failure lockout relay, a local start relay, a detection and execution relay, and a DC undervoltage relay. One end of the AC power contact module is used to connect to an AC power source; the other end of the AC power contact module is connected to the live wire port and the neutral wire port of the AC power failure lockout relay, respectively. The live wire end of the AC power contact module is connected to one end of the operating switch of the AC power failure lockout relay, the neutral wire end of the AC power contact module is connected to the neutral wire port of the AC time delay relay, the neutral wire end of the AC power contact module is connected to the neutral wire port of the local start relay, the neutral wire end of the AC power contact module is connected to the neutral wire port of the detection execution relay, and the live wire end of the AC power contact module is connected to one end of the operation module. The live wire port of the AC time delay relay and the live wire port of the local start relay are respectively connected to the other end of the operation module, so that the operation module is used to control the access of the AC time delay relay or the local start relay. The operating switch of the AC time delay relay and the operating switch of the local start relay are connected in parallel to form a first parallel circuit. The two ends of the first parallel circuit are respectively connected to the other end of the operating switch of the AC power failure lockout relay and the live wire port of the detection execution relay. The action switch of the detection execution relay is connected in series in the connection circuit between the DC charger and the battery; The live wire and neutral wire ports of the DC undervoltage relay are both connected in series in the connection circuit between the DC charger and the battery.

2. The online monitoring device for undervoltage of a power distribution terminal battery according to claim 1, characterized in that, The AC power contact module includes: a first switch and a second switch. One end of the first switch is used to connect to the live wire of the AC power supply, and one end of the second switch is used to connect to the neutral wire of the AC power supply. The other end of the first switch is connected to the live wire port of the AC power failure lockout relay, one end of the operating switch of the AC power failure lockout relay, and one end of the operating module. The other end of the second switch is connected to the neutral wire port of the AC power failure lockout relay, the neutral wire port of the AC time delay relay, the neutral wire port of the local start relay, and the neutral wire port of the detection execution relay. The first switch and the second switch are simultaneously open or closed.

3. The online monitoring device for undervoltage of power distribution terminal batteries according to claim 2, characterized in that: The operation module is a two-position selector switch. One end of the two-position selector switch is connected to the other end of the first switch. The first position contact of the other end of the two-position selector switch is connected to the live wire port of the AC time delay relay, and the second position contact of the other end of the two-position selector switch is connected to the live wire port of the local start relay.

4. The online monitoring device for undervoltage of power distribution terminal batteries according to claim 3, characterized in that: A manual detection button switch is connected between the second position contact at the other end of the two-position selector switch and the live wire port of the local start relay.

5. The online monitoring device for undervoltage of a power distribution terminal battery according to claim 2, characterized in that, The open-circuit voltage monitoring relay module further includes: a signal self-holding relay, the DC undervoltage relay including: a first DC undervoltage relay; the first operating switch of the signal self-holding relay and the operating switch of the first DC undervoltage relay are connected in parallel to form a second parallel circuit, the live wire port of the signal self-holding relay is connected to one end of the second parallel circuit, the other end of the second parallel circuit is connected to one end of a signal reset button switch, the other end of the signal reset button switch is connected to the other end of the first switch; the neutral wire port of the signal self-holding relay is connected to the other end of the second switch; the second operating switch of the signal self-holding relay is used to connect to the remote signaling interface of the power distribution terminal; the live wire port of the first DC undervoltage relay is connected to the positive terminal of the connection circuit between the DC charger and the battery, and the neutral wire port of the first DC undervoltage relay is connected to the negative terminal of the connection circuit between the DC charger and the battery.

6. The online monitoring device for undervoltage of a power distribution terminal battery according to claim 2, characterized in that, Also includes: A battery undervoltage indication module, wherein the DC undervoltage relay includes: a second DC undervoltage relay; The two ends of the operating switch of the second DC undervoltage relay are respectively connected to one end of the battery undervoltage indicator module and the other end of the first switch, and the other end of the battery undervoltage indicator module is connected to the other end of the second switch; the live wire port of the second DC undervoltage relay is connected to the positive terminal of the connection circuit between the DC charger and the battery, and the neutral wire port of the second DC undervoltage relay is connected to the negative terminal of the connection circuit between the DC charger and the battery.

7. The online monitoring device for undervoltage of a power distribution terminal battery according to claim 2, characterized in that, Also includes: A power indicator module is provided, one end of which is connected to the other end of the first switch, and the other end of which is connected to the other end of the second switch.

8. The online monitoring device for undervoltage of a power distribution terminal battery according to claim 1, characterized in that, Also includes: A voltage monitoring display screen, wherein the live wire port of the voltage monitoring display screen is connected to the positive terminal of the connection circuit between the DC charger and the battery, and the neutral wire port of the voltage monitoring display screen is connected to the negative terminal of the connection circuit between the DC charger and the battery.

9. The online monitoring device for undervoltage of a power distribution terminal battery according to claim 2, characterized in that, The detection and execution relay includes a first action switch and a second action switch. The first action switch is connected in series in the positive terminal of the connection circuit between the DC charger and the battery, and the second action switch is connected in series in the negative terminal of the connection circuit between the DC charger and the battery. The first action switch and the second action switch are simultaneously open or closed.

10. A method for online monitoring of undervoltage in a power distribution terminal battery, characterized in that, Monitoring is performed using the online undervoltage monitoring device for distribution terminal batteries as described in any one of claims 1 to 9, the method comprising: When the power distribution terminal battery undervoltage online monitoring device is powered on, the automatic monitoring function or the manual monitoring function can be selected through the operation module; When the automatic monitoring function is selected, the action switch of the AC time delay relay is closed after a preset time; or, when the manual monitoring function is selected, the action switch of the local start relay is closed. Disconnect the action switch of the detection execution relay to create an open circuit power failure in the connection circuit between the DC charger and the battery, so as to meet the battery open circuit voltage detection condition. When the open-circuit voltage of the battery is less than the preset voltage threshold of the DC undervoltage relay, the operating switch of the DC undervoltage relay is closed to trigger a battery undervoltage alarm.

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