CN218003540U - Voltage monitoring device and uninterrupted power supply equipment - Google Patents
Voltage monitoring device and uninterrupted power supply equipment Download PDFInfo
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- CN218003540U CN218003540U CN202222310908.5U CN202222310908U CN218003540U CN 218003540 U CN218003540 U CN 218003540U CN 202222310908 U CN202222310908 U CN 202222310908U CN 218003540 U CN218003540 U CN 218003540U
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Abstract
The utility model discloses a voltage monitoring device and uninterrupted power supply equipment is applied to electrical equipment technical field for solve among the prior art uninterrupted power source's the relatively poor problem of reliability of voltage monitoring device. The utility model provides a voltage monitoring device includes: a first monitoring unit and a second monitoring unit; the first monitoring unit is used for monitoring the voltage to ground of the live wire of the external uninterruptible power supply and executing an alarm action when the voltage to ground of the live wire of the external uninterruptible power supply is not in a preset voltage range; the second monitoring unit is used for monitoring the voltage to ground of the zero line of the external uninterruptible power supply and executing an alarm action when the voltage to ground of the zero line of the external uninterruptible power supply is not in a preset voltage range. Therefore, the first monitoring unit and the second monitoring unit can timely monitor the condition that the zero line or the live line of the power supply is grounded at one point and the voltage to ground is not in a preset voltage range, and execute an alarm action, so that the reliability of the voltage monitoring device of the uninterruptible power supply is improved.
Description
Technical Field
The utility model relates to an electrical equipment technical field especially relates to a voltage monitoring device and uninterrupted power supply equipment.
Background
The uninterruptible power supply is a power supply with an energy storage device and is mainly used for supplying power uninterruptedly to equipment with higher requirements on the stability of the power supply. In order to ensure the stability and reliability of output voltage, the zero line of the uninterruptible power supply is usually not grounded.
At present, under the condition that a zero line of an uninterruptible power supply is not grounded, the reliability of a voltage monitoring device is poor, and when a fault of one point of grounding exists on the zero line or a live line of the uninterruptible power supply, the voltage monitoring device cannot give an alarm because load power failure cannot be caused. If the other positions of the load system are grounded again under the condition, short-circuit current can be generated, related load switches can be tripped, voltage fluctuation of an uninterrupted output bus can be caused seriously, other normal important loads are abnormal in power supply, the influence range of equipment faults is expanded, and the safe operation of a generator set is endangered.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a voltage monitoring device and uninterrupted power supply equipment for solve the relatively poor problem of uninterrupted power source's among the prior art voltage monitoring device's reliability.
The embodiment of the utility model provides a voltage monitoring device, include: a first monitoring unit and a second monitoring unit;
the first end of the first monitoring unit is connected with a live wire of an external uninterrupted power supply, and the second end of the first monitoring unit is grounded; the first monitoring unit is used for monitoring the voltage to ground of a live wire of an external uninterruptible power supply and executing an alarm action when the voltage to ground of the live wire of the external uninterruptible power supply is not in a preset voltage range;
the first end of the second monitoring unit is connected with a zero line of an external uninterrupted power supply, and the second end of the second monitoring unit is grounded; the second monitoring unit is used for monitoring the voltage to ground of the zero line of the external uninterruptible power supply and executing an alarm action when the voltage to ground of the zero line of the external uninterruptible power supply is not in a preset voltage range.
In a possible embodiment, the voltage monitoring device further comprises an interface unit, a control unit and an alarm unit;
the first end of the interface unit is connected to a connecting line of the third end of the first monitoring unit and the third end of the second monitoring unit, and the second end of the interface unit is connected with the first end of the control unit; the interface unit is used for sending an alarm signal corresponding to the alarm action to the control unit through the transmission channel;
the second end of the control unit is connected with the alarm unit; the control unit is used for receiving the alarm signal of the alarm action and then controlling the alarm unit to send out an abnormal alarm.
In one possible embodiment, the first monitoring unit comprises a first voltage relay;
one end of a coil of the first voltage relay is connected with a live wire of an external uninterrupted power supply, and the other end of the coil of the first voltage relay is grounded;
the first end and the second end of the contact switch of the first voltage relay are connected with the interface unit respectively.
In one possible embodiment, the second monitoring unit comprises a second voltage relay;
one end of a coil of the second voltage relay is connected with a zero line of an external uninterrupted power supply, and the other end of the coil of the second voltage relay is grounded;
the first end of the contact switch of the second voltage relay is connected with the first end of the contact switch of the first monitoring unit, and the second end of the contact switch of the second voltage relay is connected with the second end of the contact switch of the first monitoring unit.
In one possible embodiment, the alarm unit comprises a buzzer and an indicator light; the buzzer and the indicator lamp are respectively connected with the control unit.
In one possible implementation, the interface unit includes an I/O module including a plurality of transmission channels and an I/O port correspondingly connected to each of the plurality of transmission channels.
In one possible embodiment, the voltage monitoring device further comprises a display unit; the display unit is connected with the third end of the control unit and is used for displaying alarm information.
In one possible embodiment, the display unit comprises a display.
On the other hand, the embodiment of the utility model provides a still provide an uninterrupted power supply equipment, include: the embodiment of the utility model provides a voltage monitoring device and an uninterruptible power supply; the first input end of the voltage monitoring device is connected with a live wire of the uninterruptible power supply, and the second input end of the voltage monitoring device is connected with a zero line of the uninterruptible power supply.
In one possible embodiment, the zero line of the uninterruptible power supply is not grounded.
The embodiment of the utility model provides a beneficial effect as follows:
the embodiment of the utility model provides an in, through set up the voltage to ground of first monitoring unit control live wire on external uninterrupted power source's live wire, and set up the voltage to ground of second monitoring unit control zero line on external uninterrupted power source's zero line, there is a bit ground connection and then leads to the condition when the voltage to ground of zero line or live wire is not in predetermineeing voltage range in the control that can be timely on external uninterrupted power source's zero line or live wire, and carry out the alarm action, uninterrupted power source's voltage monitoring device's reliability has been promoted, and, set up the redundancy that first monitoring unit control and second monitoring unit totally two monitoring units can improve equipment alarm action, even there is a monitoring unit in two monitoring units and can't work because of the fault, another monitoring unit also can monitor the condition that has a bit ground connection on the circuit and carry out the alarm action, guarantee monitoring unit's timeliness and reliability.
Drawings
Fig. 1 is a schematic structural diagram of a primary system of an uninterruptible power supply according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of a voltage monitoring apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second structure of a voltage monitoring apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third voltage monitoring apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a fourth structure of the voltage monitoring apparatus according to the embodiment of the present invention;
fig. 6 is a schematic diagram of a fifth structure of a voltage monitoring apparatus according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a sixth structure of a voltage monitoring apparatus according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a seventh structure of the voltage monitoring apparatus according to the embodiment of the present invention;
fig. 9 is an eighth structural schematic diagram of the voltage monitoring device according to the embodiment of the present invention;
fig. 10 is a schematic structural diagram of an uninterruptible power supply unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
At present, an uninterruptible power supply is mainly used for providing uninterrupted electric energy for equipment with higher requirements on power supply stability, and is widely applied to the fields of aerospace, industry, communication equipment, national defense, power plants and the like. The structure of a primary system of an uninterruptible power supply applied to a thermal power plant is shown in fig. 1, the primary system of the uninterruptible power supply mainly comprises an alternating current input power supply, a rectifier, a direct current storage battery pack, an inverter, a static change-over switch and a bypass input power supply, alternating current 380V input by a 380V alternating current input power supply is rectified into direct current 220V through the rectifier, the direct current 220V is respectively connected into the direct current storage battery pack and the inverter, the inverter converts the direct current 220V into the alternating current 220V, the primary system of the uninterruptible power supply is simultaneously provided with the static change-over switch and a group of 220V alternating current bypass power supplies, and the primary system of the uninterruptible power supply is mainly switched to the 220V alternating current bypass power supply through the static change-over switch to supply power supply for supplying power when the uninterruptible power supply is overhauled. In order to ensure the stability and reliability of the output voltage of the uninterruptible power supply, the zero line of the uninterruptible power supply is not grounded, when the uninterruptible power supply adopting the connection mode normally works, the voltage to ground of the zero line and the voltage to ground of the live line are both alternating current (110V), when a fault of one point of grounding exists on the live line or the zero line, the voltage to ground of the line with the grounding condition is abnormal, the voltage to ground of the line with the grounding condition is 0V, the voltage to ground of the normal line is 220V, but the voltage between the two lines of the live line and the zero line is unchanged, so that the alarm of an operator cannot be caused, and short-circuit current cannot be generated at the moment, the uninterruptible power supply can maintain the normal operation of a load, and the voltage monitoring device cannot monitor the fault and alarm. However, in this case, if other lines or devices in the load are grounded to cause two-point grounding, short-circuit current may be generated to cause tripping of related load switches, which may cause output voltage fluctuation of the uninterruptible power supply to cause abnormal power supply in severe cases, thereby enlarging the influence range and endangering the safe operation of the generator set. Based on this, the utility model provides a voltage monitoring device and uninterrupted power supply equipment, the device can be applied to uninterrupted power source's voltage monitoring.
The following is a detailed description of the embodiments of the present invention, and the embodiments of the present invention provide a voltage monitoring device, and as shown in fig. 2, the voltage monitoring device 100 includes: a first monitoring unit 110 and a second monitoring unit 120;
a first end of the first monitoring unit 110 is connected to a live wire of an external uninterruptible power supply, and a second end of the first monitoring unit 110 is grounded; the first monitoring unit 110 is configured to monitor a voltage to ground of a live wire of an external uninterruptible power supply, and execute an alarm operation when the voltage to ground of the live wire of the external uninterruptible power supply is not within a preset voltage range;
a first end of the second monitoring unit 120 is connected with a zero line of an external uninterruptible power supply, and a second end of the second monitoring unit 120 is grounded; the second monitoring unit 120 is configured to monitor a voltage to ground of a zero line of the external uninterruptible power supply, and execute an alarm operation when the voltage to ground of the zero line of the external uninterruptible power supply is not within a preset voltage range.
In practical application, for an uninterruptible power supply with an ungrounded zero line, monitoring units can be respectively arranged on the zero line and the live line of the uninterruptible power supply, so that the ground voltage of a line where the monitoring units are arranged can be monitored. One end of the first monitoring unit 110 is connected with the live wire connection of the uninterruptible power supply, and the other end is grounded, so that the first monitoring unit 110 is used for monitoring the voltage to ground of the live wire, determining that the load grounding condition exists on the live wire when the voltage to ground of the live wire exceeds a preset voltage range, and executing an alarm action; one end of the second monitoring unit 120 is connected to the zero line of the uninterruptible power supply, and the other end is grounded, the second monitoring unit 120 is used for monitoring the voltage to ground of the zero line, determining that the load grounding condition exists on the zero line when the voltage to ground of the zero line exceeds a preset voltage range, and executing an alarm action; the alarm action can be to connect the remote centralized control DCS module and send an alarm signal to the remote centralized control DCS module so that the remote centralized control DCS module gives an alarm. The first monitoring unit 110 and the second monitoring unit 120 may also be provided with corresponding alarm elements, and the alarm action may also be to trigger the alarm element of the monitoring unit corresponding to the alarm action to alarm.
In specific implementation, when the uninterruptible power supply normally works, the voltage to ground of the live wire and the voltage to ground of the zero wire are both 110V, the voltages are within the preset voltage ranges of the first monitoring unit 110 and the second monitoring unit 120, and the first monitoring unit 110 and the second monitoring unit 120 cannot execute an alarm action. When a point of ground fault exists on a live wire or a zero wire of the uninterruptible power supply, taking a fault of load ground on a zero wire as an example, when a fault of load ground exists on the zero wire, the voltage to ground of the zero wire drops, the voltage to ground of the live wire rises, and when the voltage to ground of the live wire is not within the preset voltage range of the first monitoring unit 110 or the voltage to ground of the zero wire is not within the preset voltage range of the second monitoring unit 120, the corresponding monitoring unit executes an alarm action; similarly, when there is a fault of load grounding on the live wire, the corresponding monitoring unit still executes an alarm action. The first monitoring unit 110 is arranged to monitor the voltage to ground of the live wire, the second monitoring unit 120 is arranged to monitor the voltage to ground of the zero wire, one-point grounding faults can be monitored on the live wire and the zero wire in time, and an alarm action is timely executed before the uninterrupted power supply generates two-point grounding and faults, so that the operation personnel can be reminded to remove the faults, the reliability of the monitoring unit is improved, and the power supply reliability of the uninterrupted power supply is improved. And the two monitoring units can improve the redundancy of the alarm action of the equipment, even if one monitoring unit in the two monitoring units cannot work due to faults, the other monitoring unit can still execute the alarm action when the change of the voltage to ground of the circuit exceeds the preset voltage range, and the timeliness and the reliability of the monitoring units are ensured.
In one possible embodiment, referring to fig. 3, the voltage monitoring apparatus 100 further includes an interface unit 130, a control unit 140, and an alarm unit 150;
a first end of the interface unit 130 is connected to a connection line between the third end of the first monitoring unit 110 and the third end of the second monitoring unit 120, and a second end of the interface unit 130 is connected to a first end of the control unit 140; the interface unit 130 is configured to send an alarm signal corresponding to the alarm action to the control unit 140 through a transmission channel;
a second end of the control unit 140 is connected with the alarm unit 150; the control unit 140 is configured to receive an alarm signal of the alarm action and then control the alarm unit 150 to issue an abnormal alarm.
In practical applications, the interface unit 130, the control unit 140 and the alarm unit 150 included in the voltage monitoring apparatus 100 may be disposed at a position closer to the first monitoring unit 110 and the second monitoring unit 120, or disposed at a position farther from the first monitoring unit 110 and the second monitoring unit 120, which is not limited herein. The interface unit 130 disposed between the control unit 140 and the two monitoring unit interface units 130 including the first monitoring unit 110 and the second monitoring unit 120 sends the alarm signal corresponding to the first action monitoring unit and the second monitoring unit 120 to the control unit 140 through the transmission channel, and the control unit 140 controls the alarm unit 150 to send out an abnormal alarm according to the received alarm signal corresponding to the alarm action.
In one possible embodiment, illustrated with reference to fig. 4, the first monitoring unit 110 comprises a first voltage relay K1;
one end of a coil of the first voltage relay K1 is connected with a live wire of an external uninterruptible power supply, and the other end of the coil is grounded;
both ends of the first end and the second end of the contact switch of the first voltage relay K1 are respectively connected with the interface unit 130.
In practical applications, the first monitoring unit 110 may include a first voltage relay K1, one end of a coil of the first voltage relay K1 is connected to a live wire of the uninterruptible power supply, and the other end is grounded, when a voltage across the coil, that is, a voltage to ground of the live wire, exceeds a preset voltage range, the first monitoring unit 110 performs an alarm action, that is, an electric shock switch of the first voltage relay K1 connected to the interface unit 130 is closed, an alarm signal corresponding to the action is a switching value signal "1", the alarm signal is sent to the control unit 140 through a transmission channel of the interface unit 130, and the control unit 140 controls the alarm unit 150 to send an abnormal alarm according to the received alarm signal corresponding to the alarm action.
During the concrete implementation, to the circumstances that uninterrupted power source zero line is ungrounded, first voltage relay K1 can be adjustable voltage relay, it predetermines the voltage range and can include overvoltage monitoring voltage range and under-voltage monitoring voltage range, first voltage relay K1's rated voltage can set up to exchanging 110V, overvoltage monitoring voltage range is 1.05 to 1.3 times of rated voltage, under-voltage monitoring voltage range is 0.7 to 0.95 times of rated voltage, also can be according to so need carry out corresponding regulation to predetermineeing the voltage range, do not do the restriction here. The preset voltage range is divided into an overvoltage monitoring voltage range and an undervoltage monitoring voltage range, so that the first voltage relay K1 executes an alarm action when the voltage to ground of the live wire exceeds the overvoltage monitoring voltage range and the undervoltage monitoring voltage range, an alarm signal corresponding to the alarm action is sent to the control unit 140 through the input channel of the interface unit 130, the control unit 140 controls the alarm unit 150 to give an abnormal alarm according to the received alarm signal corresponding to the alarm action, and undervoltage and overvoltage monitoring to the voltage to ground of the live wire of the uninterruptible power supply is realized. Setting time can also be set in the first voltage relay K1, and specifically the setting time range can be set to be 0-5 seconds, so that the problem that voltage fluctuation of the uninterruptible power supply causes erroneous judgment of the voltage monitoring device 100 can be effectively avoided, and the authenticity and effectiveness of alarming can be improved.
In a possible embodiment, illustrated with reference to fig. 5, the second monitoring unit 120 comprises a second voltage relay K2;
one end of a coil of the second voltage relay K2 is connected with a zero line of an external uninterrupted power supply, and the other end of the coil is grounded;
a first end of the contact switch of the second voltage relay K2 is connected to a first end of the contact switch of the first monitoring unit 110, and a second end of the contact switch of the second voltage relay K2 is connected to a second end of the contact switch of the first monitoring unit 110.
In practical applications, the second monitoring unit 120 may include a second voltage relay K2, one end of a coil of the second voltage relay K2 is connected to a zero line of the uninterruptible power supply, and the other end of the coil is grounded, and when a voltage across the coil, i.e., a voltage to ground of the zero line, exceeds a preset voltage range, the second monitoring unit 120 performs an alarm action, where a setting parameter of the second voltage relay K2 may be the same as that of the first voltage relay K1. Moreover, since the contact switch of the second voltage relay K2 is connected in parallel with the contact switch of the first voltage relay, when the second voltage relay K2 and the first voltage relay K1 simultaneously perform an alarm operation or one of the second voltage relay K2 and the first voltage relay K1 performs an alarm operation, an alarm signal (i.e., a switching value signal "1") is generated and transmitted to the control unit 140 through the same transmission channel of the interface unit 130, and the control unit 140 controls the alarm unit 150 to issue an abnormal alarm according to the received alarm signal.
In one possible embodiment, shown with reference to fig. 6, the alarm unit 150 comprises a buzzer and an indicator light; the buzzer and the indicator lamp are connected to the control unit 140, respectively.
In practical application, buzzer and pilot lamp can set up in the relevant position of device as required, and the buzzer of being connected with control unit 140 is used for sending audible alarm under control unit 140's effect, and the pilot lamp of being connected with control unit 140 is used for sending out audible alarm under control unit 140's effect, can make the operating personnel in time receive and know the alarm situation through multiple alarm mode to carry out troubleshooting and processing.
In one possible implementation, referring to fig. 7, the interface unit 130 includes a plurality of transmission channels and an I/O module including an I/O port correspondingly connected to each of the plurality of transmission channels.
In practical application, the I/O module disposed in the interface unit 130 is provided with a plurality of transmission channels, which may be divided according to the characteristics of the type, speed, etc. of the transmission data, and set up connected I/O ports for the transmission channels correspondingly, or set up the transmission channels as transmission channels for transmitting the specified data and set up I/O ports for the transmission channels correspondingly according to the requirements.
In one possible embodiment, referring to fig. 8, the voltage monitoring apparatus 100 further includes a display unit; the display unit is connected with the third end of the control unit 140, and the display unit is used for displaying alarm information.
In practical application, after the control unit 140 receives the alarm signal, the display unit can be controlled to display the relevant information of the abnormal alarm of the output voltage of the uninterruptible power supply on a visual picture of an operator in the forms of characters, schematic diagrams, marks and the like, so as to remind the operator to check the fault in time.
In one possible embodiment, as shown with reference to FIG. 9, the display unit includes a display. The display is mainly used for displaying characters, marks, schematic diagrams and the like of abnormal output voltage of the uninterruptible power supply.
Based on the same concept, the embodiment of the present invention further provides an uninterruptible power supply apparatus, as shown in fig. 10, the uninterruptible power supply apparatus 200 includes: the voltage monitoring apparatus 100 and the uninterruptible power supply 210 provided in this embodiment of the application; a first input of the voltage monitoring device 100 is connected to the live line of the ups 210, and a second input of the voltage monitoring device 100 is connected to the neutral line of the ups 210. In which the neutral line of the uninterruptible power supply 210 in the uninterruptible power supply apparatus 200 is not grounded.
In practical application, the zero line of the ups 210 in the ups 200 may not be grounded, and in the process of supplying power to the ups 210, the voltage monitoring device 100 may monitor the voltage to ground of the live line and the voltage to ground of the zero line of the ups, so as to find a point ground fault of the live line or the zero line of the ups 210 in time and alarm.
The embodiment of the utility model provides an among the uninterrupted power supply equipment, because voltage monitoring device can in time discover uninterrupted power source's live wire or a little ground fault of zero line and report to the police to promoted uninterrupted power source's voltage monitoring device's reliability, consequently the uninterrupted power supply equipment who uses voltage monitoring device also has corresponding advantage, no longer gives details here.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A voltage monitoring device, comprising: a first monitoring unit and a second monitoring unit;
the first end of the first monitoring unit is connected with a live wire of an external uninterruptible power supply, and the second end of the first monitoring unit is grounded; the first monitoring unit is used for monitoring the voltage to ground of the live wire of the external uninterruptible power supply and executing an alarm action when the voltage to ground of the live wire of the external uninterruptible power supply is not in a preset voltage range;
the first end of the second monitoring unit is connected with a zero line of an external uninterruptible power supply, and the second end of the second monitoring unit is grounded; the second monitoring unit is used for monitoring the voltage to ground of the zero line of the external uninterruptible power supply and executing an alarm action when the voltage to ground of the zero line of the external uninterruptible power supply is not within a preset voltage range.
2. The voltage monitoring device according to claim 1, further comprising an interface unit, a control unit and an alarm unit;
the first end of the interface unit is connected to a connecting line between the third end of the first monitoring unit and the third end of the second monitoring unit, and the second end of the interface unit is connected with the first end of the control unit; the interface unit is used for sending an alarm signal corresponding to the alarm action to the control unit through a transmission channel;
the second end of the control unit is connected with the alarm unit; and the control unit is used for receiving the alarm signal of the alarm action and then controlling the alarm unit to send out an abnormal alarm.
3. The voltage monitoring device according to claim 2, wherein the first monitoring unit comprises a first voltage relay;
one end of a coil of the first voltage relay is connected with a live wire of the external uninterruptible power supply, and the other end of the coil of the first voltage relay is grounded;
and both ends of a first end and a second end of a contact switch of the first voltage relay are respectively connected with the interface unit.
4. The voltage monitoring device according to claim 2, wherein the second monitoring unit includes a second voltage relay;
one end of a coil of the second voltage relay is connected with a zero line of the external uninterruptible power supply, and the other end of the coil of the second voltage relay is grounded;
and a first end of a contact switch of the second voltage relay is connected with a first end of a contact switch of the first monitoring unit, and a second end of the contact switch of the second voltage relay is connected with a second end of the contact switch of the first monitoring unit.
5. The voltage monitoring device of claim 2, wherein the alarm unit comprises a buzzer and an indicator light; the buzzer and the indicator light are respectively connected with the control unit.
6. The voltage monitoring apparatus according to claim 2, wherein the interface unit includes an I/O module including a plurality of transmission channels and an I/O port correspondingly connected to each of the plurality of transmission channels.
7. The voltage monitoring device according to any one of claims 2-6, further comprising a display unit; the display unit is connected with the third end of the control unit and is used for displaying alarm information.
8. The voltage monitoring device of claim 7, wherein the display unit comprises a display.
9. An uninterruptible power supply apparatus, comprising: a voltage monitoring device according to any one of claims 1 to 8, and an uninterruptible power supply; the first input end of the voltage monitoring device is connected with a live wire of the uninterruptible power supply, and the second input end of the voltage monitoring device is connected with a zero line of the uninterruptible power supply.
10. The uninterruptible power supply apparatus of claim 9, wherein a neutral line of the uninterruptible power supply is not grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222310908.5U CN218003540U (en) | 2022-08-30 | 2022-08-30 | Voltage monitoring device and uninterrupted power supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222310908.5U CN218003540U (en) | 2022-08-30 | 2022-08-30 | Voltage monitoring device and uninterrupted power supply equipment |
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| CN218003540U true CN218003540U (en) | 2022-12-09 |
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