CN213302351U - Residual current collecting device of low-voltage alternating-current power supply system of transformer substation - Google Patents
Residual current collecting device of low-voltage alternating-current power supply system of transformer substation Download PDFInfo
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- CN213302351U CN213302351U CN202022501959.7U CN202022501959U CN213302351U CN 213302351 U CN213302351 U CN 213302351U CN 202022501959 U CN202022501959 U CN 202022501959U CN 213302351 U CN213302351 U CN 213302351U
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Abstract
The utility model discloses a low pressure alternating current power supply system residual current collection system of transformer substation, include: the device comprises a processor, and a signal acquisition unit, a data storage unit, a communication unit and an alarm unit which are respectively connected with the processor; and the signal acquisition unit is respectively connected with the multi-channel residual current transformers. The device of the utility model has small volume and is suitable for being installed in a narrow space; the method is very suitable for detecting the multi-channel residual current of the low-voltage alternating current system of the transformer substation.
Description
Technical Field
The utility model relates to a residual current monitoring technology field especially relates to a low pressure alternating current power supply system residual current collection system of transformer substation.
Background
Residual current monitoring is an important means for monitoring electrical fire, and the existing low-voltage alternating-current power supply system of the transformer substation does not detect residual current of an alternating-current feeder line, so that the health state of a cable cannot be effectively monitored, and effective early warning on cable fire cannot be timely carried out.
The residual current collecting device of the low-voltage alternating current power supply system of the existing transformer substation only collects the residual current value of the alternating current feeder line and does not monitor the voltage and the load current of the alternating current feeder line, so that the development trend of the residual current of the alternating current feeder line cannot be mastered.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a low pressure alternating current power supply system residual current collection system of transformer substation can monitor multichannel alternating current feeder's residual current, can monitor alternating current feeder's voltage and load current simultaneously.
In order to achieve the above object, according to the utility model discloses a first aspect discloses a low pressure alternating current power supply system residual current collection system of transformer substation, include: the device comprises a processor, and a signal acquisition unit, a data storage unit, a communication unit and an alarm unit which are respectively connected with the processor; and the signal acquisition unit is respectively connected with the multi-channel residual current transformers.
As a further scheme, the method further comprises the following steps: an external input unit.
As a further scheme, the method further comprises the following steps: a display unit and a power supply unit.
As a further scheme, the signal acquisition unit comprises a common mode choke coil T1 and a current transformer S1 which are connected in sequence; the output end of the current transformer S1 is connected in parallel with a diode D1, a diode D2 and a resistor R1 in sequence; two ends of the resistor R1 are respectively used as two inputs of an operational amplifier U1, and the output of the operational amplifier U1 is connected with an analog-digital converter ADC.
As a further alternative, an input terminal of the operational amplifier U1 is connected in series with the resistor R2 and then connected to an output terminal of the operational amplifier U1.
As a further scheme, the signal acquisition unit is connected with a current transformer and used for acquiring load current information.
As a further scheme, the signal acquisition unit is connected with a voltage transformer and used for acquiring voltage information of the alternating current feeder line.
As a further scheme, the alarm unit alarms in the form of sound, an alarm lamp or a relay dry contact.
As a further scheme, the display unit is an LED display screen.
As a further scheme, the communication unit sends the residual current value to the background system through the ethernet or the RS485 bus.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the device of the utility model has small volume and is suitable for being installed in a narrow space; the method is very suitable for detecting the multi-channel residual current of the low-voltage alternating current system of the transformer substation.
(2) The utility model discloses can monitor AC feeder's voltage and load current simultaneously, help understanding the trend of change of residual current.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic structural view of a residual current collecting device of a low-voltage alternating-current power supply system of a transformer substation in the embodiment of the utility model;
fig. 2 is a schematic diagram of the signal acquisition unit structure in the embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a device for collecting residual current of a low-voltage ac power supply system of a transformer substation is disclosed, and with reference to fig. 1, the device includes: the device comprises a processor, a signal acquisition unit, a data storage unit, a communication unit, a display unit, an alarm unit, a power supply unit and an external input unit, wherein the signal acquisition unit, the data storage unit, the communication unit, the display unit, the alarm unit, the power supply unit and the external input unit are respectively connected with the processor.
The signal acquisition unit is respectively connected with the multi-channel residual current transformers and can acquire 16 residual current sensor signals at most; the signal acquisition unit is also connected with the current transformer and the voltage transformer respectively and is used for acquiring load current information and voltage information of the alternating current feeder line.
Specifically, referring to fig. 2, the specific structure of the signal acquisition unit includes: the common mode choke coil T1 and the current transformer S1 are connected in sequence; the output end of the current transformer S1 is connected in parallel with a diode D1, a diode D2 and a resistor R1 in sequence; two ends of the resistor R1 are respectively used as two inputs of an operational amplifier U1, and the output of the operational amplifier U1 is connected with an analog-digital converter ADC. An input terminal of the operational amplifier U1 is connected in series with the resistor R2 and then connected to the output terminal of the operational amplifier U1.
The common mode choke T1 is used for suppressing common mode interference; the input stage signal and the inside of the signal acquisition unit can be isolated through the 5mA current transformer S1, so that an internal circuit is protected; the diodes D1 and D2 are fast recovery diodes, and prevent the internal input stage of the operational amplifier from being damaged due to the large differential mode voltage between the two input ends of the operational amplifier. The resistor R2 is used for converting the alternating current small signal into a voltage signal which can be collected by the ADC collection chip.
In this embodiment, the power supply unit provides a power supply required for normal operation for other units;
the external input unit consists of keys and can set system work, alarm parameters and the like;
the display unit comprises an LED display screen and is used for displaying the collected residual current value, the system working state, the alarm state and the like;
the data storage unit is used for storing system working parameters, residual current values, historical alarm information and the like;
the communication unit can send the residual current value to the background system through the Ethernet or the RS485 bus;
the alarm indicating unit may indicate that an alarm occurs in the form of a sound, an alarm lamp, or a relay dry contact.
The device of the embodiment has small volume, is suitable for being installed in narrow space, and is very suitable for detecting the multi-channel residual current of the low-voltage alternating current system of the transformer substation.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. The utility model provides a low pressure AC power supply system residual current collection system of transformer substation which characterized in that includes: the device comprises a processor, and a signal acquisition unit, a data storage unit, a communication unit and an alarm unit which are respectively connected with the processor; and the signal acquisition unit is respectively connected with the multi-channel residual current transformers.
2. The substation low-voltage alternating current power supply system residual current collection device of claim 1, further comprising: an external input unit.
3. The substation low-voltage alternating current power supply system residual current collection device of claim 1, further comprising: a display unit and a power supply unit.
4. The residual current collection device of the substation low-voltage alternating current power supply system of claim 1, wherein the signal collection unit comprises a common mode choke T1 and a current transformer S1 which are connected in sequence; the output end of the current transformer S1 is connected in parallel with a diode D1, a diode D2 and a resistor R1 in sequence; two ends of the resistor R1 are respectively used as two inputs of an operational amplifier U1, and the output of the operational amplifier U1 is connected with an analog-digital converter ADC.
5. The substation low-voltage alternating-current power supply system residual current collection device of claim 4, wherein an input end of the operational amplifier U1 is connected in series with a resistor R2 and then connected to an output end of the operational amplifier U1.
6. The substation low-voltage alternating-current power supply system residual current acquisition device of claim 1, wherein the signal acquisition unit is connected with a current transformer and is used for acquiring load current information.
7. The substation low-voltage alternating-current power supply system residual current acquisition device of claim 1, wherein the signal acquisition unit is connected with a voltage transformer and is used for acquiring voltage information of an alternating-current feeder line.
8. The device for collecting the residual current of the low-voltage alternating-current power supply system of the transformer substation as claimed in claim 1, wherein the alarm unit alarms in a mode of sound, an alarm lamp or a relay dry contact.
9. The substation low-voltage alternating-current power supply system residual current collection device of claim 3, wherein the display unit is an LED display screen.
10. The substation low-voltage alternating-current power supply system residual current acquisition device of claim 1, wherein the communication unit sends the residual current value to a background system through an Ethernet or an RS485 bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022501959.7U CN213302351U (en) | 2020-10-30 | 2020-10-30 | Residual current collecting device of low-voltage alternating-current power supply system of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022501959.7U CN213302351U (en) | 2020-10-30 | 2020-10-30 | Residual current collecting device of low-voltage alternating-current power supply system of transformer substation |
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| CN213302351U true CN213302351U (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116908518A (en) * | 2023-07-13 | 2023-10-20 | 浙江恒业电子股份有限公司 | Acquisition terminal with residual current detection function |
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2020
- 2020-10-30 CN CN202022501959.7U patent/CN213302351U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116908518A (en) * | 2023-07-13 | 2023-10-20 | 浙江恒业电子股份有限公司 | Acquisition terminal with residual current detection function |
| CN116908518B (en) * | 2023-07-13 | 2024-04-05 | 浙江恒业电子股份有限公司 | Acquisition terminal with residual current detection function |
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Address after: No.92 torch Avenue, Erlang science and technology new town, high tech Zone, Jiulongpo District, Chongqing 400039 Patentee after: Super high voltage branch of State Grid Chongqing Electric Power Co. Address before: No.92 torch Avenue, Erlang science and technology new town, high tech Zone, Jiulongpo District, Chongqing 400039 Patentee before: MAINTENANCE BRANCH OF STATE GRID CHONGQING ELECTRIC POWER Co. |