MXPA97002660A - Method of monitoring electrical wear on selector switch disconnectors in a high voltage station - Google Patents
Method of monitoring electrical wear on selector switch disconnectors in a high voltage stationInfo
- Publication number
- MXPA97002660A MXPA97002660A MXPA/A/1997/002660A MX9702660A MXPA97002660A MX PA97002660 A MXPA97002660 A MX PA97002660A MX 9702660 A MX9702660 A MX 9702660A MX PA97002660 A MXPA97002660 A MX PA97002660A
- Authority
- MX
- Mexico
- Prior art keywords
- section
- computer
- current
- disconnector
- bar
- Prior art date
Links
Abstract
The present invention relates to a method of monitoring electrical wear on selector switch disconnectors in a bay of a high voltage station that includes a set of distribution busbars connected to at least three electrical circuits constituted by an inlet bay, an outlet bay, and a bay for coupling together the busbars. During an operation of transferring a bay under load, when the computer of the corresponding bay detects that the disconnectors of its lines for connection to the distribution busbars are closed, the computer sends a message to the other computers which then determine and store data comprising the magnitude and the polarity of the current flowing through the corresponding bays, and when the computer of the bay in which transfer is taking place has detected opening of the selector switch disconnector in the line for connection to the busbar from which distribution has been transferred, said data prior to the opening is stored and the square of the current interrupted by said disconnector is calculated.
Description
PROCEDURE FOR MONITORING THE ELECTRICAL WEAR OF THE NEEDLE DISCONNECTORS OF A CASE
HIGH VOLTAGE
DESCRIPTION OF THE INVENTION. The invention concerns a method of monitoring the electrical wear of the needle disconnectors of a high voltage house. This relates, more precisely, to a method for monitoring the electrical wear of the needle disconnectors of a section of a high-voltage house comprising a set of distribution bars that are linked to at least three electrical circuits constituted by sections of entrance and exit and by a section of coupling of the bars; Each section, which includes a connection line with each bar equipped with a needle switch and associated with a computer, can determine the value and polarity of the current passing in the section, as well as the state of the needle disconnectors of the section, all the computers of the booth are linked by a line of information transfer. In a known booth of this type, one function of the switch disconnectors and of the section for closing the circuit is to allow the transfer of load from one bar to another, ie without interruption of the distribution. During a load transfer, a needle disconnector must REF: 24444 open when a non-negligible current passes through it. Now, a disconnector experiences, during this maneuver, an electrical wear that is important to watch. It is known to monitor the mechanical wear of these disconnectors by simply counting the number of maneuvers of each disconnector. However, monitoring of this type is insufficient when load transfer operations are numerous and because the allowable limit of average electrical wear is achieved before the maximum allowable number of maneuvers. On the other hand, a well-known booth of this type is equipped with section computers that transmit the information of the states to a control room of operations, such as the positions of the disconnectors and of the circuit breaker that also comprises the entry sections. and output, and the current value of each section in order to ensure the protection of this circuit breaker. The present invention consists of a method for monitoring the electrical wear of the needle disconnectors, hitherto unmonitored, which does not need any specific supplementary material. To achieve this, the method according to the invention consists of the following treatment: during a load transfer of the section, when the corresponding section computer detects that the disconnectors of the connection lines with the distribution bars are closed, this The latter sends a message to the other computers that determine and record the data that is the value and polarity of the current of its section; - when the computer of the section has detected the opening of the needle disconnector of the connection line with the bar from which the distribution is transferred, the bar transferred, the data prior to the opening are memorized and the value of the square of the current interrupted by the disconnector. According to a preferred embodiment; the computer sends the message to the other computers via a higher level computer; - the data is transmitted to the higher level computer, which subtracts the value of the square of the current interrupted by the disconnector by calculation. Preferably, the higher-level computer transmits the value of the square of the interrupted current to the computer of the section that adds up the values as the different load transfers are made and compares this sum with an admissible limit value. The calculation of the current interrupted by the disconnector is made by adding the values of the current that enters on the transferred bar and subtracting the values of the current that leaves the transferred bar. The invention allows a precise determination of the value of the current interrupted by the disconnector. The invention is described in more detail with the help of the figures, which do not represent more than a preferred embodiment of the invention. Figures IA to 1C are schematic views of a high-voltage house and illustrate the principle of a load transfer. Figures 2A to 2D represent a high-voltage house with the control equipment of the invention and illustrate the process according to the invention. The different figures represent a high voltage stand comprising: - two distribution bars Bl, B2; an input section, T3, equipped with a circuit breaker, D3, and comprising a connection line with the first section Bl, equipped with a disconnector, S31, of needles, and a connection line with the second section B2, equipped with a needle switch, S32; - two output sections, TI, T2, each equipped with a circuit breaker, Di, D2, and each comprising a connection line with the first section Bl, equipped with a needle disconnector, Sil, S21 , and a connecting line with the second section B2, equipped with a needle disconnector, S12, S22; - a coupling section of the two bars Bl,
B2, equipped with two disconnectors S41, S42.
- -
In Figures IA to 1C, the arrows represent the currents. Figure IA illustrates the booth after a load transfer operation. The coupling section is then inoperable, its disconnectors S41 and S42 are open. The current enters through the entrance section T3 and is distributed by the first bar Bl towards the exit sections Ti and T2. All the needle disconnectors of the connection lines with the first bar Bl are therefore closed and all the needle disconnectors of the connection lines with the second bar B2 are then open. According to FIG. IB, a load transfer operation of the Ti section takes place. The disconnectors S41 and S42, of the closing section of the circuit, are initially closed and the needle disconnector S12, of the connection line with the second bar B2, of the section Ti, is closed immediately. The current then flows according to the arrows shown and the section TI receives current from the first bar Bl and from the second bar B2. Then, the needle disconnector Sil, of the connecting line with the first bar Bl, opens, as shown in figure 1C. The section Ti receives no current other than the second bar B2, the distribution is transferred from the first bar Bl to the second bar B2, for the section Ti. The load transfer operation of the Ti section has terminated. In figures 2A to 2D this same high voltage house is represented with its control equipment. In the figures, the arrows represent information transfers. Each section is equipped with a section computer, Cl to C4, which can determine, among other things, the value and polarity of the current that passes through the section thanks to a current measurement device, Ml to M4, as well as as the state (open or closed) of the section disconnectors. All these Cl to C4 computers are linked by an information transfer line L, and are linked to a higher level computer, CG, which manages the Cl to C4 computers. This last CG computer is connected to an operator's house, 01, and, according to the invention, advantageously, to a second operator's house, 02, whose function will be specified later. Figure 2A represents the house after a load transfer operation. No specific action is taken in the procedure according to the invention and no information is transmitted to the Cl to C4 computers. In Fig. 2B the load transfer operation started and the two needle disconnectors Sil and S12 are closed. This state is detected and transmitted to the Cl computer of the TI section. At this time, as schematized in Figure 2C, the computer Cl sends, via the higher-level computer CG, a message to the other computers C2 to C3 which then determine and record the data which is the value and polarity of the current of its respective section, T2 to T3. When the computer Cl has detected the opening of the needle disconnector Sil, of the connection line with the bar Bl, whose distribution is transferred, the bar transferred, and then the end of the load transfer operation, as shown in FIG. Figure 2D, the data before the opening (corresponding to the instant t just before the opening) are transmitted from computers C2 to C3 to the CG computer. This calculator CG calculates by calculation the value of the current interrupted by the switch Sil, adding the current values that enter on the transferred bar Bl and subtracting the current values that come out of the transferred bar Bl, this calculation applies the Kirchoff law of the electrical nodes. Due to its classic control function, the CG computer knows the distribution bar Bl or B2 connected to each section (information equivalent to the state (open or closed) of the switch disconnectors of each section that is transmitted by the C2 aC4 computers). The CG computer calculates the value of the square of the current interrupted by the Sil switch, - - representative of the electrical wear experienced by the disconnector Sil during this load transfer operation. This value is transmitted to the computer Cl which effects the sum of these values as the different load transfers are made and compares this sum with an admissible limit value. The operator's house 02 can make it possible to jointly visualize this monitoring of the electrical wear of each needle disconnector. The method according to the invention can be used without the intervention of a higher level computer. In this case, the message from the computer Cl is transmitted directly to the other computers C2 to C3 and the data is transmitted directly from the computers C2 to C3 to the computer Cl, which then performs, by itself, the calculation of the square of the current interrupted by the disconnector Sil. It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers. Having described the invention as above, the content of the following is claimed as property.
Claims (4)
1. A method for monitoring the electrical wear of the needle disconnectors of a section of a high voltage house comprising a set of distribution bars linked to at least three electrical circuits constituted by entry and exit sections and a section of coupling of the bars, each section comprises a connection line with each bar, equipped with a needle disconnector, and associated with a section computer it can determine the value and polarity of the current passing in the section, as well as the state of the section switches of the section, all the calculators of the section are linked by an information transfer line, where the procedure is characterized because: - during a load transfer of the section, when the computer of the corresponding section detects that the disconnectors of the connection lines with the distribution bars are closed, the latter sends a message to the s other computers, which determine and record the data, which are the value and polarity of the current of your section; - when the computer of the section has detected the opening of the needle disconnector of the connection line with the bar, whose distribution is transferred, the bar transferred, the data before the opening are stored and the value of the square of the current is calculated interrupted by the disconnector.
2. The method, according to claim 1, characterized in that: the computer sends the message to the other computers via a higher level computer; - the data is transmitted to the higher level computer, which deduces by calculation the value of the square of the current interrupted by the disconnector.
3. The method, according to claim 1 or 2, characterized in that the higher-level computer transmits the value of the square of the interrupted current to the computer of the section, which effects the sum of the values as the different transfers are made. load and compare this sum with an admissible limit value.
4. The method, according to claim 1 or 2, characterized in that the calculation of the current interrupted by the disconnector is made by adding the values of the current entering the transferred bar and subtracting the values of the current leaving the transferred bar .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9604602 | 1996-04-12 | ||
FR9604602A FR2747475B1 (en) | 1996-04-12 | 1996-04-12 | METHOD FOR MONITORING THE ELECTRICAL WEAR OF THE SWITCHING SWITCHES OF A HIGH VOLTAGE STATION |
Publications (2)
Publication Number | Publication Date |
---|---|
MX9702660A MX9702660A (en) | 1998-06-30 |
MXPA97002660A true MXPA97002660A (en) | 1998-10-30 |
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