WO2021152364A1 - Système d'aide au fonctionnement d'un appareillage de commutation de distribution et procédé associé - Google Patents

Système d'aide au fonctionnement d'un appareillage de commutation de distribution et procédé associé Download PDF

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Publication number
WO2021152364A1
WO2021152364A1 PCT/IB2020/058508 IB2020058508W WO2021152364A1 WO 2021152364 A1 WO2021152364 A1 WO 2021152364A1 IB 2020058508 W IB2020058508 W IB 2020058508W WO 2021152364 A1 WO2021152364 A1 WO 2021152364A1
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WO
WIPO (PCT)
Prior art keywords
switch
control unit
electrical signal
signal
earth
Prior art date
Application number
PCT/IB2020/058508
Other languages
English (en)
Inventor
Pramod Balasaheb JADHAV
Parmanand Parshuram TENDULKAR
Devendra Heeralal SANTANI
Jagdish Akaram KAMBLE
Shriprakash Govardhan JOSHI
Original Assignee
The Tata Power Company Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Tata Power Company Limited filed Critical The Tata Power Company Limited
Publication of WO2021152364A1 publication Critical patent/WO2021152364A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B7/00—Enclosed substations, e.g. compact substations
    • H02B7/01—Enclosed substations, e.g. compact substations gas-insulated
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B7/00—Enclosed substations, e.g. compact substations
    • H02B7/06—Distribution substations, e.g. for urban network

Definitions

  • the present disclosure relates to the field of electrical power distribution systems. More particularly, the present disclosure relates to a system for assisting operation of a distribution switchgear and a method thereof.
  • An electric power distribution system supplies power to various consumer premises from a substation by means of feeders.
  • the electric power distribution system is classified into radial distribution system, parallel feeders distribution system, ring main distribution system, and interconnected distribution system according to its feeder connection schemes or topologies.
  • Each of these systems comprises a distribution switchgear including circuit breakers, isolators/disconnectors, and a variety of protection devices.
  • the distribution switchgears are used to facilitate control, protection and isolation of the distribution feeders.
  • Most of the existing power distribution systems are ring main and interconnected distribution systems. These systems are generally used for medium to high voltage power distribution.
  • the feeders in these systems, form a loop which starts from the substation bus-bars, runs through the load area feeding distribution transformers and returns to the substation bus-bars.
  • Each distribution transformer is fed with two feeders but in different paths as in radial system. Thus, if one feeder is under fault or maintenance, the transformer will still be energized by other feeders connected to it. This leads to an improvement in system reliability.
  • the distribution switchgear in the power distribution system is used both for isolating a feeder and for implementing outages to clear faults downstream. Accordingly, an operation engineer works on a distribution switchgear under two conditions - (i) when a fault occurs in the network and (ii) for implementing outages under normal conditions. In both the conditions, there is a possibility of human error to creep in, leading to unintended operation of the isolators which can cause damage to the equipment and the operator.
  • the line isolators/load break switches and circuit breakers in a distribution switchgear are closed and the ground isolator/earth switch is open.
  • the circuit breakers and line isolators/load break switches are opened, and the ground isolator/earth switch is closed. Accordingly, the sequence of breaking the circuit under fault conditions or for maintenance purposes is - open the line isolator, check back charging status (on Voltage Presence Indicator System), and close the ground isolator.
  • Another object of the present disclosure is to provide a voice assistant system that facilitates easy operation of the distribution switchgear.
  • Still another object of the present disclosure is to provide a system for assisting operation of a distribution switchgear that restricts the operation of the earth switch upon detecting an unsafe operating condition.
  • Yet another object of the present disclosure is to provide a system for assisting operation of a distribution switchgear that alerts the operator in time to prevent wrong operation of the switchgear.
  • Still another object of the present disclosure is to provide a system for assisting operation of a distribution switchgear that is compatible with existing Ring Main Units (RMUs) and other distribution switchgears.
  • RMUs Ring Main Units
  • Yet another object of the present disclosure is to provide a system for assisting operation of a distribution switchgear that is backward compatible.
  • Still another object of the present disclosure is to provide a system for assisting operation of a distribution switchgear that ensures operator and equipment safety.
  • the present disclosure envisages a voice assistant system for a distribution switchgear.
  • the distribution switchgear is a Ring Main Unit (RMU) switchgear and comprises a pressure gauge and at least two isolator legs.
  • the pressure gauge is configured to monitor pressure of an isolating gas within the distribution switchgear.
  • Each isolator leg includes a disconnect switch, an earth switch, and a Voltage Presence Indicator (VPI).
  • the VPI is configured to indicate presence of voltage across the associated isolator leg.
  • the voice assistant system comprises a first limit switch, a control unit and a speaker.
  • the first limit switch is associated with each of the earth switches.
  • the first limit switch is configured to operate upon detecting movement of an access channel of the associated earth switch.
  • the control unit is associated with each of the isolator legs.
  • the control unit is configured to cooperate with the disconnect switch, the earth switch, the VPI, pressure gauge, and the first limit switch to receive signals corresponding to the status of the disconnect and earth switches, state of the VPI, and pressure within said distribution switchgear, upon the operation of the associated first limit switch.
  • the control unit is further configured to analyze the received disconnect-switch status signal, earth-switch status signal, VPI-state signal, and pressure signal to output at least one electrical signal based on a pre-determined set of output generation rules.
  • the speaker is configured to cooperate with the control unit to receive the electrical signal, and is further configured to generate a sound output for assisting an operator working on the distribution switchgear based on the received electrical signal.
  • control unit comprises a memory, a first input port, a second input port, a third input port, a fourth input port, an analyzing module, and an output port.
  • the memory is configured to store the pre-determined set of output generation rules.
  • the first input port is connected to a contact of the disconnect switch to receive the disconnect-switch status signal.
  • the second input port is connected to a contact of the earth switch to receive the earth-switch status signal.
  • the third input port is connected to the VPI of the isolator leg to receive the VPI state signal.
  • the fourth input port is connected a contact of the pressure gauge to receive the pressure signal.
  • the analyzing module is configured to cooperate with the first, second, third input, and fourth input ports to receive the disconnect-switch status signal, the earth-switch status signal, the VPI state signal, and the pressure signal upon the operation of the first limit switch.
  • the analyzing module is further configured to cooperate with the memory to analyze the received signals and generate the electrical signal based on the pre-determined set of output generation rules.
  • the output port is connected to the speaker.
  • the output port is configured to receive the electrical signal from the analyzing module, and is further configured to output the electrical signal to the speaker.
  • control unit is configured to detect an unsafe operating pressure condition based on the received pressure signal and the pre-determined set of output generation rules.
  • the control unit is further configured to generate and provide a first electrical signal to the speaker for facilitating generation of a sound output to notify the operator about unsafe operating pressure; or
  • control unit is configured to detect a safe operating pressure condition based on the received pressure signal and the pre-determined set of output generation rules, and is further configured to generate and provide a second electrical signal to the speaker for facilitating generation of a sound output to notify the operator about safe operating pressure.
  • control unit is configured to detect an unsafe operating condition for operating the earth switch based on the received, earth-switch status signal, VPI state signal, and the pre-determined set of output generation rules, and is further configured to:
  • control unit is configured to de-activate the electrically operated mechanical switch when the access channel associated with the earth switch is released.
  • control unit is configured to generate a fourth electrical signal if the unsafe operating condition is not detected, and is further configured to provide the generated fourth electrical signal to the speaker for facilitating generation of a sound output to notify the operator about safe operating condition.
  • the system includes a second limit switch associated with each of the disconnect switches.
  • the second limit switch is configured to operate upon detecting movement of an access channel of the associated disconnect switch.
  • the control unit is configured to cooperate with the second limit switch to generate and provide a fifth electrical signal to the speaker for facilitating generation of a sound output to notify the operator about the disconnect switch being operated.
  • system is implemented as a stand-alone unit. In another embodiment, the system is integrated with the distribution switchgear.
  • the present disclosure also envisages a method for assisting operation of a distribution switchgear. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
  • Figure 1 illustrates a line diagram of a system for assisting operation of a distribution switchgear
  • Figure 2 illustrates a block diagram of a control unit of the system of Figure 1;
  • Figures 3A and 3B illustrate a flow diagram depicting steps involved in a method for assisting operation of a distribution switchgear. LIST OF REFERENCE NUMERALS
  • Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details, are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
  • first, second, third, etc. should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element from another element. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
  • system 100 A system for assisting operation of a distribution switchgear (hereinafter referred as “system 100”) and a method thereof (hereinafter referred as “method 300”), of the present disclosure, is now being described with reference to Figure 1 through Figure 3B.
  • the distribution switchgear 102 is a totally sealed, gas-insulated, compact switchgear unit.
  • the distribution switchgear 102 comprises at least two isolator legs 104. Each of the isolator legs 104 includes a disconnect switch 110 and an earth switch 118.
  • the distribution switchgear 102 may also include at least one breaker leg 106.
  • the breaker leg 106 includes a circuit breaker 108, a line isolator/disconnect switch 110, and an earth switch 118.
  • the disconnect switches 110 and the earth switches 118 include a plurality of contacts.
  • the distribution switchgear 102 also comprises a pressure gauge. The pressure gauge is configured to monitor pressure of an isolating gas within the distribution switchgear 102.
  • the distribution switchgear 102 is a Ring Main Unit (RMU) distribution switchgear.
  • RMU Ring Main Unit
  • the system 100 of the present disclosure comprises a first limit switch, a control unit 114, and a speaker 116.
  • the first limit switch is associated with each of the earth switches 118.
  • the first limit switch is configured to operate upon detecting movement of an access channel of the associated earth switch 118.
  • the distribution switchgear 102 includes a plurality of Voltage Presence Indicators (VPIS).
  • a VPI 112 is connected in each of the isolator and breaker legs (104, 106).
  • the VPIS 112 are configured to indicate presence of voltage across the isolator legs 104 and the breaker legs 106.
  • the control unit 114 is associated with each of the isolator legs 104.
  • the control unit 114 is configured to cooperate with the disconnect switch 110, the earth switch 118, the VPI 112, the pressure gauge, and the first limit switch to receive signals corresponding to the status of the disconnect and earth switches (110, 118), state of the VPI 112, and pressure within said distribution switchgear 102, upon the operation of the associated first limit switch.
  • the control unit 114 is further configured to analyze the received disconnect-switch status signal, earth-switch status signal, VPI-state signal, and pressure signal to output at least one electrical signal based on a pre determined set of output generation rules.
  • the operation of the first limit switch triggers the control unit 114 to check the status of the disconnect and earth switches (110, 118) and state of the VPI 112.
  • the speaker 116 is configured to cooperate with the control unit 114 to receive the electrical signal, and is further configured to generate a sound output for assisting an operator working on the distribution switchgear 102 based on the received electrical signal.
  • the control unit 114 comprises a memory 202, a first input port 204, a second input port 206, a third input port 208, a fourth input port 214, an analyzing module 210, and an output port 212.
  • the memory 202 is configured to store the pre-determined set of output generation rules.
  • the first input port 204 is connected to a contact of the disconnect switch 110 to receive the disconnect-switch status signal.
  • the second input port 206 is connected to a contact of the earth switch 118 to receive the earth- switch status signal.
  • the third input port 208 is connected to the VPI 112 of the isolator leg 104 to receive the isolator- VPI state signal.
  • the fourth input port 214 is connected a contact of the pressure gauge to receive the pressure signal.
  • the analyzing module 210 is configured to cooperate with the first, second, third, and fourth input ports (204, 206, 208, 214) to receive the disconnect-switch status signal, the earth-switch status signal, the VPI state signal, and the pressure signal upon operation of the first limit switch.
  • the analyzing module 210 is further configured to cooperate with the memory 202 to analyze the received signals and generate the electrical signal based on the pre-determined set of output generation rules.
  • the memory 202 includes a library of audio components and the pre determined set of output generation rules include rules for selecting audio components from a library for generating the electrical signal.
  • the output port 212 is further configured to output the electrical signal to the speaker 116.
  • the speaker 116 generates sound output for assisting the operator to make decisions while working on the distribution switchgear 102 based on the received electrical signal.
  • the library and the pre-determined set of output generation rules can be programmed to facilitate generation of sound output in a required language.
  • the analyzing module 210 includes a signal conditioning unit and a processor.
  • the signal conditioning unit is configured to cooperate with the first, second, third, and fourth input ports (204, 206, 208, 214) to receive the disconnect-switch status signal, the earth-switch status signal, the isolator- VPI state signal, and the pressure signal and is further configured to generate values corresponding to the status of the disconnect switch 110, the earth switch 118 and the state of the VPIS 112.
  • the memory 202 is configured to receive and store the generated values.
  • the processor is configured to check if the values corresponding to the status signals, state signal, and pressure signal are present in the memory 202. Upon detecting the presence of said values, the processor is further configured to generate electrical signals for the speaker 116 based on the pre-determined set of output generation rules.
  • the pressure gauge of the distribution switchgear 102 is provided with at least one contact.
  • the contact may be a Normally Open (NO) or a Normally closed (NC) contact.
  • the pressure gauge continuously monitors pressure of the isolating gas (for example, SF6) within the distribution switchgear 102. When the measured pressure falls below a safe operating pressure value, the contact of the pressure gauge changes state. The pressure signal indicates the state of the contact.
  • the control unit 114 is configured to detect an unsafe operating pressure condition, and is further configured to generate and provide a first electrical signal to the speaker 116 for facilitating generation of a sound output to notify the operator about the unsafe operating pressure.
  • control unit 114 is configured to detect a safe operating pressure condition based on the received pressure signal and the pre-determined set of output generation rules, and is further configured to generate and provide a second electrical signal to the speaker 116 for facilitating generation of a sound output to notify the operator about safe operating pressure.
  • the control unit 114 For example, if the pressure measured within the distribution switchgear 102 is below the safe operating pressure value, the control unit 114 generates an electrical signal to make the speaker 116 generate a sound output saying “Gas pressure is low. Please do not operate.” Thus, the operator is alerted about the low pressure and operator safety is ensured.
  • control unit 114 is configured to detect an unsafe condition for operating the earth switch 118 based on the received earth-switch status signal, VPI state signal, the said pre-determined set of output generation rules, and is further configured to: i. generate and provide a third electrical signal to the speaker 116 for facilitating generation of a sound output to notify the operator about the unsafe operating condition; and ii. generate a trigger signal to activate an electrically operated mechanical switch for restricting the operation of the earth switch 118.
  • the control unit 114 is configured to de-activate the electrically operated mechanical switch when the access channel associated with the earth switch 118 is released.
  • the electrically operated mechanical switch is de-activated by stopping the generation of the trigger signal.
  • the control unit 114 may be configured to stop the generation of the trigger signal after a pre-determined delay upon detecting release of the earth switch channel.
  • the control unit 114 is configured to generate a fourth electrical signal if the unsafe operating condition is not detected, and is further configured to provide the generated fourth electrical signal to the speaker 116 for facilitating generation of a sound output to notify the operator about safe operating condition.
  • the pre-determined set of output generation rules may include logic for detecting an unsafe condition.
  • the control unit may be configured to generate the trigger signal when the isolator cable is back-charged i.e. the VPI state signal is high. The sound output is generated to notify the operator about the detected unsafe condition and the trigger signal is provided to the electrically operated mechanical switch to restrict the operation of earth switch 118.
  • the system 100 includes a second limit switch associated with each of the disconnect switches 110.
  • the second limit switch is configured to operate upon detecting movement of an access channel of the associated disconnect switch.
  • the control unit 114 is configured to cooperate with the second limit switch to generate and provide a fifth electrical signal to the speaker 116 for facilitating generation of a sound output to notify the operator about the disconnect switch 110 being operated. For instance, if the operator is trying to access the disconnect switch channel to operate it, the control unit 114 generates an electrical signal to make the speaker 116 generate a sound output saying, “You are operating isolator XXXX at XXX RMU.”
  • the system 100 is implemented as a stand-alone unit. In another embodiment, the system 100 is integrated with the distribution switchgear 102.
  • the present disclosure also envisages a method 300 for assisting operation of a distribution switchgear 102.
  • the distribution switchgear 102 comprises a pressure gauge and at least two isolator legs 104.
  • the pressure gauge is configured to monitor pressure of an isolating gas within the distribution switchgear 102.
  • Each of the isolator legs 104 includes a disconnect switch 110, an earth switch 118, and a Voltage Presence Indicator (VPI) 112.
  • the VPI 112 is configured to indicate presence of voltage across the associated isolator leg 104.
  • the method 300 comprises:
  • step 302 - detecting, by a control unit 114, pressure of an isolating gas within the distribution switchgear 102, by receiving a state of a contact of the pressure gauge;
  • step 304 - generating, by the control unit 114, a first electrical signal based on a pre determined set of output generation rules, if the detected pressure is below a safe operating pressure value;
  • step 308 - detecting, by a first limit switch, movement of a channel associated with the earth switch 118;
  • step 310 receiving, by the control unit 114, signals corresponding to a status of the earth switch 118 and the state of VPI 112 associated with the isolator leg 104 upon the operation of the first limit switch;
  • step 312 - detecting, by the control unit 114, an unsafe operating condition based on the received earth-switch status signal, VPI state signal, and the pre-determined set of output generation rules; if an unsafe condition is detected-
  • step 314 - generating, by the control unit 114, a third electrical signal; receiving, by the speaker 116, the third electrical signal from the control unit 114; generating, by the speaker 116, a sound output based on the received third electrical signal to notify the operator about the detected unsafe operating condition,
  • step 316 - generating, by the control unit 114, a trigger signal to activate an electrically operated mechanical switch for restricting the operation of the earth switch 118 upon detecting the unsafe operating condition, if an unsafe condition is not detected-
  • step 318 generating, by the control unit 114, a fourth electrical signal; receiving, by the speaker 116, the fourth electrical signal from the control unit 114; and generating, by the speaker 116, a sound output based on the received fourth electrical signal to notify the operator about safe operating condition.
  • the method 300 includes the step (Step 324) of deactivating the electrically operated mechanical switch for unblocking the operation of the earth switch when the access channel of the earth switch is released.
  • the method 300 includes the step (Step 306) of: generating, by the control unit 114, a second electrical signal based on the pre determined set of output generation rules, if the detected pressure is greater than or equal to the safe operating pressure value; receiving, by the speaker 116, the second electrical signal from the control unit 114; and generating, by the speaker 116, a sound output based on the received second electrical signal to notify the operator about safe operating pressure.
  • the method 300 includes the following steps:
  • step 320 - detecting, by a second limit switch, movement of a channel associated with the disconnect switch 110;
  • step 322 generating, by the control unit 114, a fifth electrical signal upon the operation of the second limit switch; - receiving, by the speaker 116, the fifth electrical signal from the control unit 114;
  • the system 100 and method 300 facilitate easy operation of the distribution switchgear 102 as the operator is constantly notified about various parameters such as SF6 gas pressure, status of switches (i.e. isolators, earth switch, load switch, etc.), and back charging in cables and guided accordingly. Thus, safety of the operator and the equipment is ensured. Further, the system 100 is compatible with existing Ring Main Units (RMUs) and other distribution switchgears.
  • RMUs Ring Main Units
  • RMUs Ring Main Units
  • other distribution switchgears

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

La présente invention concerne le domaine des systèmes de distribution d'énergie électrique et concerne un système (100) et un procédé (300) d'aide au fonctionnement d'un appareillage de commutation de distribution 5 (RMU) (102). Le système (100) comprend un premier commutateur de limite, une unité de commande (114) et un haut-parleur (116). Un indicateur de présence de tension (VPI) est connecté dans chaque branche (104, 106) de l'appareillage de commutation de distribution (102) et indique la présence de tension dans des câbles terminés dans l'appareillage de commutation (102). L'unité de commande (114) surveille l'état des commutateurs de déconnexion (110) et des commutateurs de mise à la terre (118) et l'état de VPIS (112) pour générer au moins un signal électrique 0. Le haut-parleur (116) reçoit le signal électrique et génère une sortie sonore pour aider un opérateur à travailler avec l'appareillage de distribution (102). L'unité de commande (114) surveille également la pression de gaz dans l'appareillage de commutation de distribution (102) pour alerter l'opérateur d'une pression de fonctionnement dangereuse.
PCT/IB2020/058508 2020-01-29 2020-09-14 Système d'aide au fonctionnement d'un appareillage de commutation de distribution et procédé associé WO2021152364A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202021003949 2020-01-29
IN202021003949 2020-01-29

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WO2021152364A1 true WO2021152364A1 (fr) 2021-08-05

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100142103A1 (en) * 2007-03-16 2010-06-10 Carsten Thrue Compact Secondary Substation Comprising A Fault Protection System, A Method For Fault Protection In A Compact Secondary Substation, And A Control Unit For Performing The Method
CN107196295A (zh) * 2017-06-26 2017-09-22 国网山东省电力公司烟台供电公司 低压配电网络断电智能报警系统

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100142103A1 (en) * 2007-03-16 2010-06-10 Carsten Thrue Compact Secondary Substation Comprising A Fault Protection System, A Method For Fault Protection In A Compact Secondary Substation, And A Control Unit For Performing The Method
CN107196295A (zh) * 2017-06-26 2017-09-22 国网山东省电力公司烟台供电公司 低压配电网络断电智能报警系统

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