DD229812A1 - PROCESS FOR RECEIPTING THE FAILURE OF PERFORMANCE SWITCHES - Google Patents

Abstract

The invention relates to a method for early detection of the failure of circuit breakers. The invention is intended to achieve that after a completed switching operation made a statement about the operating state of circuit breakers, or is ensured when exceeding limit parameters during an "off" switching operation by monitoring the circuit breaker, that this is enabled. According to the invention, this is achieved by a method in which during the shutdown of a network fault by the circuit breaker, the digital path-time characteristic of the circuit breaker is received and entered via the optical fiber cable into the computer and that in parallel there is a second measured value detection by the network fault analysis whose measured values are also supplied to the computer in which n-digital path-time characteristics of the properly functioning circuit breaker are stored and in which a nominal-actual comparison is made with the recorded digital path-time characteristic of the circuit breaker such that Depending on three tolerance ranges, a message or an "off" pulse takes place. Fig. 3

Description

Berlin, dan 18th TRO 4737

May 1984

applicant:

YEB transformer factory

"Karl Liebknecht"

Patent department

1160 Berlin-Ober schöneweide

WilheIminenhofstraße 83-85

Title of the invention

Method for early detection of failure of circuit-breaker η

Field of application of the invention

The invention relates to a method for the early detection of the verse agens of circuit breakers, in which at low deviations from the course of the switching operation, a warning signal or »on exceeding of limit parameters an" off "- pulse is supplied to the parent circuit breaker, so that the faulty circuit breaker can be unlocked»

Characteristic of the known technical solutions

The demand for constant increase in the safety of electrical switchgear inevitably leads to the requirement for as comprehensive information about the switching state of the switching devices used, in particular the circuit breaker · To the switching states "off" or "on", for example, from circuit breakers come to come in the case of these signaling switches for use, which are known in the most varied designs

- P -

A major disadvantage of this switch, however, is that only conditionally detected conditions of the circuit breaker v / earth. Since the I.Ieideschalter are usually at ground potential, comes as a further disadvantage that direct information about the switching state in the switching chamber not present «) In the context of further development, it has therefore also lacked solutions by which the operating state of electrical Switchgear should be monitored. Thus, according to DD-PS 89153, H 01 H, 9/16 -s.a. DD-PS 87850, H 01 H, 9/15 - a comprehensive number of signals to both medium voltage potential and ground potential via AND - or OR gates are linked, which are then continued to a central switch position indicator. While in DE-AS 2115509, H 02 H, 3/04 a circuit arrangement for monitoring the operating state of electrical systems is described, which is a comprehensive system for detecting noise levels in switchgear also UiTD - or OR-links, which leads to a Lead message is by DE-AS 1498173 G 08 G, 21/00 a digital position measuring device for Iv'essen the adjustment of a movable part with respect to a fixed part with. an internal counter known whose converted in analog form digital content is continuously compared with an actual position of the movable part representing analog size to signal a fault = Finally, according to the DD-PS 133872, G 08 C, 17/00 already a Device for detecting and transmitting the switching position message known, in which provided using high-voltage potential panels whose light pulses are guided in the switching movement via fiber optic cable to a collection point to provide information there about the circuit, d. ho information about which position the shift rod has moved.

_ 3 -

However, all these methods and devices have the disadvantage that they are not suitable for providing information about the operating state of circuit breakers. But this means that an initially small error within the circuit breaker can expand in the course of several switching operations to the incapacity of the circuit breaker, since it is not detected.

Object of the invention

The aim of the invention is to make a statement about the operating state of circuit breakers after a completed switching operation, so that an expansion of a still small error within the circuit breaker s is avoided until the incapacity of the circuit breaker, or when exceeding limit parameters during of an "off" switching operation. Monitoring the circuit breaker to ensure that it is unlocked.

Explanation of the essence of the invention

The invention has the object augrunde to provide a method for early detection of the failure of circuit breakers, in which at low deviations from the course of the switching operation, the maintenance personnel is automatically informed about the just functioning circuit breaker, so that it can be unlocked and revised parent, or in which an "off" pulse is supplied to the higher-order circuit breaker when the limit parameters are exceeded, so that the faulty circuit breaker is disconnected.

According to the invention this is achieved in that recorded during the shutdown of a network fault through the circuit breaker, the digital path-time characteristic of the course of the actual turn-off of the circuit breaker and is input via the optical fiber of the secondary technology in the computer and that parallel to the shutdown of the network error, a second Measured value acquisition is carried out by the per se known network fault analysis and the thereby obtained measured values are likewise fed to the computer in which the network error is determined by analyzing the measured values, where n network error variants correspond exactly to the η-digital path-time characteristics of the faultlessly functioning circuit breaker, stored in the computer, retrieved as a function of the respective network error and out with the recorded during the shutdown of the network error digital path-time characteristic of the circuit breaker via a target-actual comparison for a comparison program be evaluated such that, depending on the size of a tolerance range / A ₁ X _x . ; Z \ ^ XP5 ^x 3> ^ ^{n em s} i are the voltage pulses, a message about the erfolgreiche'Abschaltung, over the still successful shutdown, which is related to the occurrence of a warning signal, or on the unsuccessful shutdown, in which an "off" pulse is made by the computer to the higher-level circuit breaker.

According to a further feature of the invention, in this method, the respective digital path-time characteristic corresponding to the course of the actual "off" switching operation of the circuit breaker is taken up by the arrangement of Wiegand modules along the circuit breaker of the circuit breaker whose core is opposite the shell in the "on" switch position of the circuit breaker by a reset magnet assigned to each Wiegand module.

magnet is is rl; becomes. By means of a setting magnet in the switching rod whose magnetis the field strength is greater than that of one, each restoring magnet, the magnetization of the core moving in the direction of the shell of the core is moved in the same direction as the setting magnet moves past the Y / iegand modules. i-.Iodule made successively, so that the sensor coils of the Wiegand modules emit a voltage pulse, which is converted in an optical transmitter into a light pulse, then fed via the optical fiber to a receiver and after it is converted there back into a voltage pulse, fed to the computer becomes.

On the other hand, in this method, the Hetsfehieranalyse be done by! Of its current and voltage through the already existing in the electrical switchgear distance protection.

Finally, advantageously stored in the computer η-digital 7ieg-time-Sennlinien the properly functioning circuit breaker recorded before commissioning of the circuit breaker in Plochleistungsprüffeld and then encoded accordingly stored in the computer.

O u rt to th e i o s e o 1 e

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings show:

1 shows an arrangement for bounce Lies solution of the digital path-time-Eennlinie a circuit breaker,

2 shows the voltage pulses generated and recorded with the arrangement according to FIG. 1 during the "off" switching operation, FIG.

3 is a circuit diagram for the "early recognition" of the circuit breaker circuit,

Flg. 45 e

-on «'· a section of the recorded voltage pulses of the target 7. ^r eg-time characteristic in comparison with a section of the voltage pulses of the Jst-7 / eg-time characteristic for the three tolerance ranges ^ x,; Δ y '> - ² ^ ^r o. ·

G-emä.3 Fig. 1, the bounce Lies solution of the digital-time-time curve in the 2chaltkaramer of the circuit breaker, which is in the illustration shown in the "lin" -3chaltstellung done by moving along the movement of the shift rod 1 at a "Off" switching operation next to the shift rod 1 n-V7iegand modules 2 are arranged with the associated sensor coils and reset magnets. In this case, the core of the 7 / iegand-I.Iodule 2 is magnetized by the magnet opposite as opposed to the shell. At the end of the shift rod 1, a setting magnet 3 is provided, the magnetic field strength is greater than that of a return magnet. If an "off" switching operation of the circuit breaker is carried out on this basis, the switching rod 1 moves with the setting magnet 3 past the Wiegand modules 2 and causes a sudden magnetization in the same direction of the core in the direction of the shell of each Wiegand Hodules 2 one after the other, whereby in each case a voltage pulse is generated in the sensor coils of each Wiegand module 2, which is converted by a located at high voltage potential transmitter 4- into a light pulse and then fed via a fiber optic cable 5 to a receiver 6, in which the light pulse back into a Voltage signal is converted. The resulting n-3pannungsimpulse shown in Fig. 2 for the ^{; t} Au.s ^T! - Switching over the corresponding time t _o are shown and that characterized by the fourth t. ;

t "and y, where ΐ · the pulse time, t" the off pulse time

Cl * - el

and ν is the duty cycle, are a measure of the path-time history of the circuit breaker; it follows that

s = f (v) or s = f (t), since ν = s- and t. = const

° a and s is the travel of the shift rod; and are input to a computer 7 shown in FIG. As shown in FIG. 3, takes place parallel to the recording of the digital path-time characteristic of the circuit breaker 8 during the shutdown of a network error by the digital path-time encoder 9, a second data acquisition, the Hetzfehleranalyse 10 through the distance protection. In this case, current and voltage are measured in the event of a short circuit, digitized via an AD converter and processed in the assembly modulator, in which an optical transmitter is integrated, via a multiplex hierarchy, but this is not shown further. The processing takes place in such a way that it is possible to transmit the measured values sequentially as a pulse-modulated data block.

In the module input digital input with serial optical input, the optical signals are converted back into electrical, which is likewise not shown further and then taken over by the computer 7. In this, the analysis of the measured values takes place according to a predetermined program, whereby the network error is determined. N-network error variants correspond exactly to η-digital path-time characteristics of the properly functioning circuit breaker, which are recorded before commissioning of the circuit breaker 8 in the high performance test field and then coded accordingly stored in the computer 7 · After determining the network error in the computer 7 and retrieve this network error associated target path-time characteristic is recorded by the digital path-time encoder 9 path-time characteristic of the circuit breaker 8 with the retrieved desired path-time characteristic -sa Jig. 4 - compared by three criteria.

If the voltage pulses are in the tolerance range Δ ^, the shutdown is successful and no signals are produced. If the voltage pulses are already in the tolerance range / \ Xp, the shutdown is still successful, but it is already indicated that there are mechanical defects in the circuit breaker present, so that a corresponding warning signal 11 takes place. However, if the voltage pulses are within the tolerance range Z1, then it can be assumed that the switch-off will not be successful. The computer 7 therefore immediately gives an "off" pulse 12 to the higher-level power switch 13, so that the defective circuit breaker is enabled.

Claims (1)

Request for approval Method for the early detection of circuit breaker failure, in which "in the event of slight deviations from the course of the shunting operation, a warning signal is triggered or if an external limit switch is exceeded, an" off "pulse is supplied to the higher-level circuit breaker so that the faulty circuit breaker can be disconnected; characterized in that during the shutdown of a Ketzfehlers by the circuit breaker, the digital path-time characteristic of the course of the actual "off" switching operation of the circuit breaker is received and input via the optical fiber of the secondary technology in the computer and that parallel to the shutdown of the network error second Lleßwerterfassung done by the known per se network fault analysis and the measurements thus obtained are also fed to the computer in which is determined by analyzing the lethal values of the network error, where nl \ ^T etzfehlervarianten exactly η-digital path-time characteristics of e Corresponding circuit breaker functioning properly, stored in the computer, retrieved depending on the respective network error and with the recorded during the shutdown of the network error digital path-time characteristic of the circuit breaker on a target-actual comparison according to a comparison program ausgev / ertet, so, that depending on the size of a tolerance range Λ. x * ; Λ Xp; -X-, in which the voltage pulses are located, a message about the successful shutdown, about the still successful shutdown, which is connected to the triggering of a warning signal, or about the unsuccessful shutdown, in which an "off" pulse from the computer to the higher-level circuit breaker is made. Method according to item 1, characterized in that the respective digital path-time characteristic curve corresponding to the course of the actual switch-off operation of the circuit breaker is picked up by the arrangement of Wiegand modules along the switching rod of the circuit breaker, the core of which is opposite the shell in the "Sin". -Switched position of the circuit breaker is magnetized by a respective Wiegand module associated return magnet opposite, and that by a shift lever located in the shift magnet whose magnetic field strength is greater than that of each return magnet, when passing the setting magnet on the Wiegand modules, a co-magnetization of the Kernes towards the shell of the Wiegand-Liodule is made successively, so that the sensor coils of the Wiegand-Liodule deliver a voltage pulse, which converted into an optical transmitter in a light pulse, then fed via the optical fiber cable to a receiver and after being converted back into a voltage pulse there, the computer is supplied. Method according to item 1, characterized in that the network fault analysis is carried out by measuring current and voltage through the distance protection of the electrical switchgear. Method according to item 1, characterized in that the stored in the computer n- = digital path-time characteristics of the properly functioning circuit breaker recorded before commissioning of the circuit breaker in the high-performance test field and then encoded accordingly stored in the computer. π «ο.