JPH03261322A - Tap contact change predicting system for transformer - Google Patents

Abstract

PURPOSE:To improve reliability of a transformer by outputting a contact inspection preparation message and a contact change message based on an accumulated number of tap change times in an onload tap changer of the transformer. CONSTITUTION:Transformer bodies 1a-1n are provided with tap contact analyzers 2a-2n and sequence controllers (SC) 3a-3n. Furthermore, an operational processing section 4 and a printer 5 are provided. The contact analyzers 2a-2n analyze the operation of the tap contacts and provide analog operation signals of the tap contacts to the SC 3a-3n. The SC 3a-3b produce digital monitoring data which is then fed to the operational processing section 4. The operational processing section 4 outputs a contact inspection message to the printer 5 based on the number of tap change times one year before inspection. Furthermore, the operational processing section 4 outputs a contact replacement message about one year before replacement of the contact.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a method for predicting the replacement of tap contacts in a transformer.

B. Summary of the Invention The present invention is a method for predicting the replacement of tap contacts in a transformer, and prepares for contact inspection when the value obtained by subtracting the number of tap changes that occur in a predetermined period from the number of tap changes until inspection is required reaches a predetermined number. By outputting a contact replacement message and outputting a contact replacement message when the number of tap changes that require replacement minus the number of tap changes in a predetermined period reaches a predetermined value, a highly reliable contact replacement prediction method can be achieved. obtain.

C9 Conventional Technology In the on-load tap changer of a transformer, taps are changed frequently, so it is necessary to predict the lifespan of the tap contacts and replace them.

However, conventionally, contacts have been replaced by estimating the lifespan of the tap contacts based on human records and intuition.

Problems that the D2 invention aims to solve In the past, people relied on human records and intuition, so it was not possible to accurately judge the deterioration status of appropriate contacts, and since it was done by humans, people sometimes forgot. Reliable contact inspection was not possible.

The present invention has been made in view of the above-mentioned problems, and its purpose is to improve the reliability of transformers and prevent transformer failures by automatically determining the deterioration status of tap contacts. It is an object of the present invention to provide a method for predicting the replacement of tap contacts of a transformer, which can prevent such problems.

E1 Means and Effects for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a method for predicting the time to replace a tap switching contact based on the number of times the transformer taps are switched. In some cases, the cumulative value of the number of tap switching times is stored based on the tap switching information, and when this cumulative value reaches the number of switching times that requires contact inspection minus the number of switching times within a predetermined period, the contact is required. A contact inspection preparation message is output before the predetermined period of inspection, and after the contact inspection, the number of tap switching is accumulated from the time of the contact inspection, and the cumulative value is calculated from the number of tap switching requiring contact inspection to the actual number of tap switching within the predetermined period. A contact inspection preparation message is output before the next inspection for a predetermined period of time, and a contact replacement message is output when the total number of tap changes reaches the set number of contacts that need to be replaced minus the number of switches within the predetermined period. do.

F. Example Embodiments of the present invention will be described below with reference to the drawings.

The figure shows a method for predicting tap contact replacement of a transformer according to an embodiment of the present invention. In the figure, la, lb..., In are transformer bodies, 2a, 2b,..., 2n are tap contact analyzers, 3a, 3b,..., 3n are soak controllers, and 4 is monitoring data processing. Section 5 is a printer.

According to the replacement prediction method shown in the figure, the contact analyzers 2a to 2n are
Each of them analyzes the operation of the tap contacts of the transformer main bodies 1a=1n, and transmits analog operation signals of the tap contacts to the soaking controllers 3a to 3n. The sensor controllers 3a to 3n convert analog operating signals from the contact analyzers 2a to 2n into digital monitoring data and guide the data to an arithmetic processing unit 4 that processes the monitoring data. The arithmetic processing unit 4 performs arithmetic processing based on the monitoring data from the soak controllers 3a to 3n, and causes the printer 5 to print a predetermined message.

That is, when the taps of the transformer bodies 1a-In are changed, the contact analyzers 2a-2n transmit the analysis data to the arithmetic processing unit 4 via the sequence controllers 3a-3n. The arithmetic processing unit 4 saves (memorizes) the cumulative number of tap changes based on the analysis data. Furthermore, the arithmetic processing unit 4 calculates the number of times the tap has been changed by subtracting the number of times of tap change in one year from the preset number of times of tap change requiring contact inspection (for example, 100,000 times), that is, the number of times of tap change that requires contact inspection in one year. Beforehand, the printer 5 prints a contact inspection preparation message, and after the contact inspection, the number of tap changes is accumulated from that point, and the number of tap changes that require contact inspection is subtracted from the number of tap changes in one year. A contact inspection preparation message is output one year before the required inspection, when the number of switchings has been reached, and these steps are repeated. This is repeated, and when the number of tap changes that requires contact replacement (for example, 800,000 times) minus the actual number of tap changes in one year is reached, a contact replacement message is output.

As described above, when tap switching is performed, the contact analyzer 2
Information is transmitted from a to 2n to the arithmetic processing unit 4, and the cumulative number of tap switching times is stored using this information. When determining the contact status (number of tap changes until specified inspection required)
- (the number of tap changes occurring in about one year), the arithmetic processing unit 4 outputs a contact inspection preparation message and causes the printer 5 to print it. Therefore, the user can determine in advance that it will be necessary to request an inspection from the manufacturer after about one year, and can perform irregular inspections without waiting for a failure to occur. Also, in the same manner as the preparation message, when it is necessary to convert the contacts (number of tap changes that require replacement) - (number of times per year), a contact replacement message is output approximately every year. Therefore, the user can decide in advance when to replace the contacts, which is convenient from a budget standpoint.

G1 Effect of the Invention The present invention analyzes the contact status of a tap changer, stores the cumulative value of the number of tap changes in the arithmetic processing unit based on this analysis data, and outputs a contact inspection preparation message based on this cumulative value. At the same time, since a contact replacement message is output, it is possible to accurately determine the deterioration status of the transformer tap changer contacts, and this makes it possible to accurately inspect and predict the replacement of the contacts. reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a method for predicting tap replacement of a transformer according to an embodiment of the present invention. 1a=1n...Transformer body, 2a-2n...Contact analyzer, 3a-3n...Sequence controller, 4 Arithmetic processing unit, 5...Printer.

Claims (1)

[Claims] (1) In a method that predicts when to replace a tap switching contact based on the number of tap switching times of a transformer, when a tap switching is performed, the cumulative value of the number of tap switching times is saved based on the tap switching information, and this cumulative value is stored. When the number of tap changes that requires contact inspection minus the actual number of tap changes within a predetermined period is reached, a contact inspection preparation message will be output before the specified period of contact inspection, and after the contact inspection, the corresponding The number of tap changes is accumulated from the time of contact inspection, and the cumulative value is calculated from the number of tap changes that require contact inspection to the actual number of tap changes within a predetermined period.A contact inspection preparation message is output before the next inspection, and a tap change is made. A tap contact replacement prediction method for a transformer, characterized in that a contact replacement message is output when the total number of contacts reaches a set number of times of contact replacement minus the number of times of switching within a predetermined period.