CN218526100U

CN218526100U - Automatic matching device for low-frequency load shedding and feeder and power distribution auxiliary system

Info

Publication number: CN218526100U
Application number: CN202222983027.XU
Authority: CN
Inventors: 谢江宁; 徐定康; 张霁明; 胥晶; 孙已棋; 张莺; 徐春土; 潘杰锋; 杨跃平
Original assignee: Ningbo Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Current assignee: Ningbo Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-02-24
Anticipated expiration: 2032-11-09

Abstract

The utility model provides a low-frequency load shedding and feeder automation matching device and a power distribution auxiliary system, which relate to the technical field of power distribution automation, wherein the low-frequency load shedding and feeder automation matching device comprises a plurality of signal detectors, and the signal detectors are used for acquiring low-frequency signals; the signal detectors are respectively in communication connection with the counter, and the counter is used for counting the number of the substations generating the low-frequency signals; the terminal panel is electrically connected with the counter and is in communication connection with the signal detector, the terminal panel comprises an alarm, when the number counted by the counter is 1, the alarm is used for sending alarm information, and when the number counted by the counter is greater than or equal to 2, the terminal panel is used for sending a locking signal to the feeder automation master station. The utility model discloses a low frequency deloading and feeder automation cooperation device has the advantage that effectively stops single transformer substation because of the debugging or the low frequency deloading protection error signal that equipment trouble produced leads to feeder automation master station erroneous judgement.

Description

Automatic matching device for low-frequency load shedding and feeder and power distribution auxiliary system

Technical Field

The utility model relates to a distribution automation technical field particularly, relates to a low frequency deloading and feeder automation cooperation device and distribution auxiliary system.

Background

The feeder automation technology is the core of distribution network automation, and is a direct and effective technical means and important guarantee for improving power supply reliability and reducing power supply loss of a power distribution network. Feeder automation can make the electric wire netting operation more intelligent to the development requirement of distribution automation is realized step by step.

The low-frequency load shedding protection is a safety control measure for preventing the frequency collapse of the power system. When the frequency of the power system is reduced due to the shortage between the requirements of the power generation and the power utilization loads, a part of secondary loads arranged in the system in advance are sequentially cut off according to the action frequency value set in advance, so that the active power of the system tends to balance again, and the frequency is increased again.

However, the matching problem of the low-frequency load shedding protection and the feeder automation is not solved by a definite scheme, for example, when a low-frequency signal source is from only one substation, which may be caused by a signal sent by a device by mistake or by a test performed by a maintainer, the substation generating the low-frequency signal has no fault but still triggers the feeder automation master station to send out a blocking signal, and switches around the substation area are controlled to isolate the fault, so that part of users are affected by power failure.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem how to stop single transformer substation because of debugging or the low frequency deloading protection error signal that equipment trouble produced lead to feeder automation master station erroneous judgement.

In order to achieve the above purpose, the technical solution of the present invention is as follows:

a low frequency deloading and feeder automation coordination device, comprising:

the signal detectors are arranged in corresponding substations and connected with buses of the substations, and are used for acquiring low-frequency signals;

the counter is used for being arranged in a feeder automation central station and electrically connected with the feeder automation central station, the signal detectors are respectively in communication connection with the counter, and the counter is used for counting the number of the substations generating the low-frequency signals;

the terminal panel, the terminal panel be used for set up in the automatic master station of feeder, and with the automatic master station electricity of feeder is connected, the terminal panel with the counter electricity is connected, and with signal detector communication connection, the terminal panel includes the alarm, works as when the quantity of counter statistics is 1, the alarm is used for sending alarm information, works as when the quantity of counter statistics is for being more than or equal to 2, the terminal panel be used for to the automatic master station of feeder sends blocking signal.

The utility model provides a pair of low frequency deloading and feeder automation cooperation device compares in prior art, has but not be limited to following beneficial effect:

low frequency deloading and feeder automation cooperation device, through set up a plurality of signal detector in the transformer substation that corresponds and with the bus connection of transformer substation, can acquire the frequency of each transformer substation bus in real time, when signal detector acquires that the frequency falls to circuit low frequency protection setting value, the counter can make statistics of the quantity of the transformer substation that produces low frequency signal and feed back to the terminal panel, the quantity of making statistics of when the counter is 1, the low frequency signal source only comes from 1 transformer substation promptly, probably the device sends out signal or maintainer and makes the experiment and causes by mistake, so this device does not send blocking signal, only send alarm information through the alarm, remind the operating personnel in the feeder automation master station to verify the reason that appears only coming from the low frequency signal of 1 transformer substation, when the quantity of counter statistics is for being more than or equal to 2, the low frequency signal source comes from 2 or more than 2 transformer substations, can confirm the low frequency event that grid power is not enough to cause this moment, the terminal panel will send blocking signal to automatic master station of automatic feeder, in order to trigger the blocking feeder automation function. The utility model discloses a low frequency deloading and feeder automation cooperation device compares in prior art, has the low frequency deloading protection error signal that effectively stops single transformer substation because of debugging or equipment trouble produce and leads to the advantage of feeder automation master station erroneous judgement.

Optionally, the low-frequency deloading and feeder automation matching device further comprises a delay relay, wherein the delay relay is used for being arranged in the feeder automation main station, and the delay relay is electrically connected with the terminal panel.

Optionally, the signal detector comprises a measuring element for acquiring voltage and measuring frequency by a busbar voltage change of the substation.

Optionally, the signal detector further includes a determining element, and when the frequency is lower than a set value and reaches a certain time, the determining element is configured to determine whether the frequency is decreased due to insufficient power of the power grid.

Optionally, the alarm includes a first indicator light and a first buzzer, the first indicator light is electrically connected to the first buzzer, and when the counted number of the counter is 1, the first indicator light and the first buzzer send out alarm information.

Optionally, the terminal panel further includes a second indicator light and a second buzzer, the second indicator light is electrically connected to the second buzzer, and when the counted number of the counters is greater than or equal to 2, the second indicator light and the second buzzer send out alarm information.

Optionally, the terminal panel further includes a third indicator light, and when the number counted by the counter is 0, the third indicator light is in a light-on state, and when the number counted by the counter is greater than or equal to 1, the third indicator light is in a light-off state.

Optionally, the terminal panel further includes a reset button, and the reset button is electrically connected to the counter and the terminal panel, and is in communication connection with the signal detector.

Optionally, the terminal panel further includes a display screen, the display screen is in communication connection with the signal detector and is electrically connected to the counter, and the display screen is configured to display digital information of the signal detector and the counter.

Additionally, the utility model also provides a distribution auxiliary system, include as before the low frequency deloading and feeder automation cooperation device.

Since the technical improvement and technical effect of the distribution auxiliary system are the same as those of the low frequency load shedding and feeder automation matching device, the technical effect of the distribution auxiliary system will not be described in detail.

Drawings

Fig. 1 is a schematic structural diagram of a low-frequency load shedding and feeder automation matching device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the operation of the signal detector according to the embodiment of the present invention.

Description of reference numerals:

1. a signal detector; 2. a counter; 3. a terminal panel; 31. a first indicator light; 32. a second indicator light; 33. a third indicator light; 34. a reset button; 35. a display screen; 4. a time delay relay; 100. and (5) a transformer substation.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Also, in the drawings, the Z-axis indicates a vertical, i.e., up-down position, and a positive direction of the Z-axis (i.e., an arrow direction of the Z-axis) indicates up, and a negative direction of the Z-axis (i.e., a direction opposite to the positive direction of the Z-axis) indicates down.

It should also be noted that the foregoing Z-axis representation is meant only to facilitate the description of the invention and to simplify the description, and is not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered limiting of the invention.

As shown in fig. 1 to fig. 2, the utility model discloses a low frequency deloading and feeder automation cooperation device, include:

the signal detectors 1 are arranged in the corresponding transformer substations 100 and connected with the buses of the transformer substations 100, and the signal detectors 1 are used for acquiring low-frequency signals;

the counter 2 is used for being arranged in a feeder automation main station, the signal detectors 1 are respectively in communication connection with the counter 2, and the counter 2 is used for counting the number of the substations 100 which generate the low-frequency signals;

terminal panel 3, terminal panel 3 are used for setting up in feeder automation master station, and with feeder automation master station electricity is connected, and terminal panel 3 is connected with 2 electricity of counter, and with signal detector 1 communication connection, and terminal panel 3 includes the alarm, and when the quantity of 2 statistics of counter was 1, the alarm was used for sending alarm information, and when the quantity of 2 statistics of counter was for being more than or equal to 2, terminal panel 3 be used for to feeder automation master station sends blocking signal.

In this embodiment, as shown in fig. 1, a plurality of signal detectors 1 are arranged in corresponding substations 100 and connected to busbars of the substations 100, so that the frequency of busbars of each substation 100 can be obtained in real time, when the frequency obtained by the signal detectors 1 is reduced to a line low-frequency protection set value, a counter 2 counts the number of the substations 100 generating low-frequency signals and feeds the counted number back to a terminal panel 3, when the counted number of the counter 2 is 1, that is, a low-frequency signal source is only from 1 substation 100, a device may mistakenly send a signal or a test is initiated by a maintenance worker, so the device does not send a blocking signal, only sends an alarm through an alarm to remind an operator in a feeder automation master station to verify the reason that the low-frequency signal only from 1 substation 100 occurs, and when the counted number of the counter 2 is greater than or equal to 2, that the low-frequency signal source is from 2 or more than 2 substations 100, at this time, it may be determined that a low-frequency event caused by insufficient power of a power grid is generated, and the terminal automation panel 3 sends a blocking signal to a feeder automation master station to trigger a function of blocking the feeder automation master station. The utility model discloses a low frequency deloading and feeder automation cooperation device compares in prior art, has the low frequency deloading protection error signal that effectively stops single transformer substation 100 and produce because of debugging or equipment trouble and leads to the advantage that feeder automation master station misjudgement.

In the above working process, as shown in fig. 2, the signal detector 1 may collect voltage and measure frequency through a bus voltage change of the substation 100, when the frequency is lower than a set value and reaches a certain time (the set value and the maintenance time may be set), it may be determined that the frequency is too low due to insufficient power of the power grid, and the frequency is fed back to the counter 2, and the counter 2 receives information of the signal detector 1 and counts the number of substations 100 generating low frequency signals. The signal detector 1 may also be configured to automatically filter out false signals, including: 1) The frequency reduction of the power grid caused by insufficient power is a relatively linear process, if the frequency change rate df/dt in unit time is too large, the voltage waveform distortion is possibly caused by system failure or TV loop failure transient process, and the signal is judged to be an error signal at the moment; 2) When the measuring frequency exceeds the measuring range; 3) When the bus of the transformer substation is in voltage loss; 4) The transformer substation line has the maintenance clamp plate to drop into, and the generating line has maintenance work promptly, judges this moment as the false signal.

Optionally, the low-frequency deloading and feeder automation matching device further comprises a delay relay 4, the delay relay 4 is used for being arranged in the feeder automation central station, and the delay relay 4 is electrically connected with the terminal panel 3.

In this embodiment, as shown in fig. 1, the delay relay 4 and the terminal panel 3 may be connected by a wire, when the counted number of the counter 2 is greater than or equal to 2, that is, the low-frequency signal source is from 2 or more than 2 substations 100, it may be determined that the low-frequency event is caused by insufficient power of the power grid, the power system power shortage at this time endangers normal operation, after the delay which can be set by the delay relay 4 (considering that the power system is possibly disturbed and the refresh time of device sampling, filtering out an error signal, for example, for 3 seconds), the terminal panel 3 sends a blocking signal to the feeder automation main station, the feeder automation main station automatically switches the fully-automatic line which has been put into operation to a semi-automatic mode, and the feeder automation will not automatically perform load transfer.

Optionally, the signal detector 1 comprises a measuring element for collecting voltage and measuring frequency by means of a busbar voltage variation of the substation 100.

In this embodiment, during the operation of the substation 100, the bus voltage of the substation 100 may fluctuate, and the measuring element of the signal detector 1 may collect the voltage according to the bus voltage change and measure the frequency.

Optionally, the signal detector 1 further comprises a determining element, and when the frequency is lower than the set value and reaches a certain time, the determining element is used for determining whether the frequency is reduced due to insufficient power of the power grid.

In this embodiment, the signal detector 1 may monitor the frequency on the substation bus, and when the power system fails and the frequency drops too fast, for example, the frequency drop value/time >5 Hz/sec, it is considered that the frequency drop is not caused by the system power shortage, so that a part of error signals may be filtered by the determination element of the signal detector 1.

Optionally, the alarm includes a first indicator lamp 31 and a first buzzer, the first indicator lamp 31 is electrically connected to the first buzzer, and when the counted number of the counter 2 is 1, the first indicator lamp 31 and the first buzzer send out alarm information.

In this embodiment, as shown in fig. 1, the first indicator lamp 31 and the first buzzer may be connected by a wire, when the counted number of the counter 2 is 0, that is, each substation 100 operates normally, at this time, the first indicator lamp 31 may be in a green lamp state, when the counted number of the counter 2 is 1, that is, the low frequency signal source only comes from 1 substation 100, which may be caused by a signal sent by the device by mistake or a test by a service man, so the device does not send out a blocking signal, at this time, the first indicator lamp 31 is changed from the green lamp to the red lamp state, and the first buzzer sends out an alarm sound to remind an operator in the feeder automation central station to verify the reason that the low frequency signal only comes from 1 substation 100.

Optionally, the terminal panel 3 further includes a second indicator light 32 and a second buzzer, the second indicator light 32 is electrically connected to the second buzzer, and when the counted number of the counter 2 is greater than or equal to 2, the second indicator light 32 and the second buzzer send out an alarm message.

In this embodiment, referring to fig. 1, the second indicator light 32 and the first indicator light 31 may be arranged vertically at intervals along the Z-axis direction, the second indicator light 32 and the second buzzer may be connected by a wire, when the counted number of the counter 2 is less than 2, the second indicator light 32 is in a green light state, when the counted number of the counter 2 is greater than or equal to 2, the second indicator light 32 is turned from a green light state to a red light state, the second buzzer generates an alarm sound (which may be distinguished from the sound of the first buzzer so as to facilitate an operator in the feeder automation central station to make a quick judgment), when the counted number of the counter 2 is greater than or equal to 2, that is, the low-frequency signal source is from 2 or more than 2 substations 100, at which it may be determined that the low-frequency event is caused by insufficient power of the power grid, the terminal panel 3 sends a locking signal to the feeder automation system main station to trigger the feeder automation function of locking the feeder automation system.

Optionally, the terminal panel 3 further includes a third indicator light 33, and when the counted number of the counter 2 is 0, the third indicator light 33 is in an on state, and when the counted number of the counter 2 is greater than or equal to 1, the third indicator light 33 is in an off state.

In this embodiment, as shown in fig. 1, the third indicator light 33, the second indicator light 32, and the first indicator light 31 may be arranged at intervals in the vertical direction along the Z axis, when the counted number of the counter 2 is 0, that is, each substation 100 operates normally, at this time, the third indicator light 33 is in a light-on state, for example, a green light, or a color different from the colors of the second indicator light 32 and the first indicator light 31, so that an operator in the feeder automation central station can make a judgment, and when the counted number of the counter 2 is greater than or equal to 1, the third indicator light 33 is turned from light-on to light-off state.

Optionally, the terminal panel 3 further comprises a reset button 34, and the reset button 34 is electrically connected to the counter 2 and the terminal panel 3, respectively, and is in communication connection with the signal detector 1.

In this embodiment, as shown in fig. 1, the reset button 34 may be connected to the counter 2 and the terminal panel 3 by wires, the reset button 34 may be connected to the signal detector 1 by a remote communication (e.g., ethernet, optical fiber), that is, communication is formed between the reset button 34 and the signal detector 1 by transmission interaction of signals, and an operator in the feeder automation central office may reset the counter 2, the terminal panel 3 and the signal detector 1 by the reset button 34.

Optionally, the terminal panel 3 further includes a display screen 35, the display screen 35 is in communication connection with the signal detector 1 and is electrically connected to the counter 2, and the display screen 35 is configured to display digital information of the signal detector 1 and the counter 2.

In this embodiment, as shown in fig. 1, the display screen 35 may be connected to the signal detector 1 through remote communication (e.g., ethernet, optical fiber), the display screen 35 may be connected to the counter 2 through a wire, and the display screen 35 may display the voltage frequency values of the substations and the real-time data counted by the counter 2 in real time, so as to facilitate real-time monitoring by an operator in the feeder automation central office.

In addition, the utility model discloses distribution auxiliary system of another embodiment, including the automatic cooperation device of low frequency deloading and feeder as before.

Since the technical improvement and technical effect of the distribution auxiliary system are the same as those of the low frequency load shedding and feeder automation matching apparatus, the technical effect of the distribution auxiliary system will not be described in detail.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims

1. The utility model provides a low frequency deloading and automatic device that cooperates of feeder which characterized in that includes:

the system comprises a plurality of signal detectors (1), a plurality of signal detectors (1) and a plurality of signal detection units, wherein the signal detectors (1) are arranged in corresponding transformer substations (100) and are connected with buses of the transformer substations (100), and the signal detectors (1) are used for acquiring low-frequency signals;

the counter (2) is used for being arranged in a feeder automation central station, the signal detectors (1) are respectively in communication connection with the counter (2), and the counter (2) is used for counting the number of the substations (100) generating the low-frequency signals;

terminal panel (3), terminal panel (3) be used for set up in the automatic total station of feeder, and with the automatic total station of feeder electricity is connected, terminal panel (3) with counter (2) electricity is connected, and with signal detector (1) communication connection, terminal panel (3) include the alarm, work as when the quantity of counter (2) statistics is 1, the alarm is used for sending alarm information, works as the quantity of counter (2) statistics is for being greater than or equal to 2 when, terminal panel (3) be used for to the automatic total station of feeder sends blocking signal.

2. The low frequency deloading and feeder automation coordination device according to claim 1, further comprising a time delay relay (4), wherein the time delay relay (4) is configured to be disposed in the feeder automation central station, and the time delay relay (4) is electrically connected to the terminal panel (3).

3. A low frequency load shedding and feeder automation co-ordination device according to claim 1, characterized in that the signal detector (1) comprises measuring elements for collecting voltage and measuring frequency by busbar voltage variations of the substation (100).

4. A low frequency load shedding and feeder automation coordination device according to claim 3, characterized in that the signal detector (1) further comprises a judging element for judging whether the frequency is reduced due to insufficient grid power when the frequency is lower than a set value and reaches a certain time.

5. The automatic matching device for low frequency load shedding and feeder line according to claim 1, wherein the alarm comprises a first indicator lamp (31) and a first buzzer, the first indicator lamp (31) is electrically connected with the first buzzer, and when the number counted by the counter (2) is 1, the first indicator lamp (31) and the first buzzer send out alarm information.

6. A low frequency load shedding and feeder automation coordination device according to claim 1, characterized in that said terminal panel (3) further comprises a second indicator light (32) and a second buzzer, said second indicator light (32) is electrically connected to said second buzzer, when the number counted by said counter (2) is greater than or equal to 2, said second indicator light (32) and said second buzzer send out an alarm message.

7. A low frequency load shedding and feeder automation coordination device according to claim 1, characterized in that the terminal panel (3) further comprises a third indicator light (33), when the number counted by the counter (2) is 0, the third indicator light (33) is in a light-on state, and when the number counted by the counter (2) is greater than or equal to 1, the third indicator light (33) is in a light-off state.

8. A low frequency load shedding and feeder automation coordination device according to claim 1, characterized by that, the terminal panel (3) further comprises a reset button (34), the reset button (34) is electrically connected with the counter (2), the terminal panel (3) and is connected with the signal detector (1) in communication.

9. A low frequency load shedding and feeder automation coordination device according to claim 1, characterized in that said terminal panel (3) further comprises a display screen (35), said display screen (35) is communicatively connected with said signal detector (1) and electrically connected with said counter (2), said display screen (35) is used for displaying digital information of said signal detector (1) and said counter (2).

10. A power distribution auxiliary system comprising the low frequency load shedding and feeder automation coordination device of any of claims 1 to 9.