JPH01286216A - Operation time measuring device for opening/closing equipment - Google Patents

Abstract

PURPOSE:To prevent the accident of a gas insulation opening/closing device with a simple structure by providing a time measuring section measuring the operation time of an opening/closing equipment for one channel jointly to individual channels of the gas insulation opening/closing device. CONSTITUTION:When the operation time of a breaker is to be measured, the rise of the current wave-form is detected by operation command current detecting sensors 51a-51e provided in relation to the control circuit of the breaker, an operation equipment selecting circuit 531 judges that the operation equipment is the breaker and it is either in the 'on' or 'off' operation, and a time measuring circuit 561 is started to measure time. The operation start and operation completion positions are detected by breaker position detecting sensors 54a-54e and transmitted to the time measuring circuit 561 by a position detection sensor receiving circuit 551. The operation time of the breaker can be correctly measured by the time measuring circuit 561 based on signals of the position detecting sensors 54a-54e.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a preventive maintenance system particularly suitable for confirming and monitoring the reliability of stored equipment in a gas-insulated switchgear in which power equipment is compactly stored. This invention relates to an operating time measuring device for switching equipment.

(Conventional technology) In recent years, due to the need to strengthen substation equipment due to the soaring cost of land and the increase in power supply in urban areas, SFG gas, which has excellent insulation and arc-extinguishing properties, has been used to create disconnectors and circuit breakers. So-called gas-insulated switchgear has become popular, and has replaced conventional air-insulated switchgear. It's working.

Although the gas-insulated switchgear described above has various advantages such as being more compact and reducing the number of exposed live parts in the grounded tank, it is difficult to perform maintenance diagnosis due to higher performance, increases the time required for maintenance and repair work, etc. If an abnormality occurs internally, the reliability is significantly reduced.

Therefore, in order to improve the reliability of gas-insulated switchgear as a whole, efforts have been made to appropriately design and manufacture the equipment. Confirmation and monitoring are required, and therefore research and development has been progressing on preventive maintenance systems that can reliably confirm that the operating state is normal and perform early detection and monitoring in the event of an abnormality.

FIG. 2 shows a single line diagram of a gas insulated switchgear that constitutes a substation. In FIG. 2, a switching disconnector 32 is attached to the parallel main bus 31, and beyond that, a circuit breaker 33, a line-side disconnector 34, and a grounding switch 35 are connected for each line, and a bushing 36 It is connected to overhead power lines via.

These component devices are placed in a sealed pressure vessel for each line and insulated with SF and gas.

Recently, in gas insulated switchgear configured in this way,
Demand for preventive maintenance systems such as those described above is increasing. Among the monitoring items in this preventive maintenance system, one of the most important items is monitoring the operating time of switching equipment.

That is, since the switching equipment itself has moving parts and they move at fairly high speeds, the bus bar.

Compared to stationary equipment such as transformers, there is a higher probability of malfunctions, and disconnectors, circuit breakers, etc. are the main components of substations, and their malfunctions can greatly impede the stable operation of substations. High fear.

Therefore, it is necessary to establish a system that can measure the operating time of each switching device and take immediate countermeasures when an abnormality is detected in the measured value.

FIG. 3 shows an example of a method for measuring the operating time of such a switching device. In FIG. 3, 41 is a waveform of an operation command current flowing through a control line of a control circuit of a switching device, and 42 is a stroke curve of a movable part of the switching device. In addition, 54a and 54a in the figure are position detection signal waveforms of position detection sensors of the movable part of the switching equipment attached to the drive part of the switching equipment, and are turned ON at locations corresponding to each end of the stroke curve.

OFF L/ is on.

As an example of the configuration of a time measurement circuit used in such an operation time measurement method, there is a structure as shown in FIG. 4, for example. Fourth
In the figure, 51 is an operation command current detection sensor attached to the control line of the control circuit of the switching equipment, and its output is
The signal is transmitted to a receiver 53 via a cable 52. 54a engineering.

Reference numeral 54a2 is a position detecting sensor for a movable part of the switching equipment attached to the switching equipment driving part, and conventionally a micro switch, a proximity sensor, or the like is used. The output signals of these position detection sensors 54a, 54a2 are transmitted to a receiver 55 via a cable 52. Reference numeral 56 denotes a time measurement circuit, which starts time measurement at the rise of the operation command current waveform 41 as shown in FIG. 3, and measures the time from this rise to the start of operation (72 in FIG. 3),
Actual opening/closing operation time from the start of operation to the end of operation (
72) in FIG. 3, the measured data is subjected to arithmetic processing, and transmitted to a processing device [57] that performs storage, display output, etc. .

(Problem to be Solved by the Invention) When applying such a time measurement system to an actual substation, it is most desirable to have an independent time measurement system for each switchgear as shown in Figure 2. However, this would require as many time measurement circuits 56 as shown in FIG. 4 for the number of switching devices, which would complicate the configuration and would be difficult to realize from an economic standpoint. . Also, the fourth
In the figure, the equipment downstream from each receiver 53, 55 is housed in a control panel installed at the site or in the control room.
Providing the time measurement circuit 56 independently for each switching device increases the size of this control panel, which also poses a problem in terms of layout.

In this way, with conventional gas-insulated switchgear, it is not possible to install an operating time measurement system that is optimal for substation operation, so it is necessary to confirm the reliability of the normal operation status of gas-insulated switchgear. As a result, early detection and monitoring were not possible in the event of an abnormality, and a large amount of time was required for maintenance, inspection, and repair work in the event of an accident.

The purpose of the present invention is to provide a preventive maintenance system for gas-insulated switchgear that can prevent accidents in gas-insulated switchgear, and is ideal for ensuring a stable supply of electricity and eliminating economic losses caused by accidents. It is an object of the present invention to provide an operating time measuring device for a switching device having a simple configuration.

[Structure of the invention]

(Means for Solving the Problems) The operating time measuring device for switching equipment of the present invention is capable of measuring the operating time of each of the switching equipment in a circuit configured by connecting and arranging switching equipment such as a circuit breaker, a disconnector, and a grounding switch. A switching operation command current detection sensor is provided in connection with each control circuit and detects the rising edge of the current waveform of the switching operation command current and generates an output signal; A position detection sensor that detects the drive start and drive end positions and issues a position detection signal, a switching operation command current detection sensor for each of the switching devices, and a switching operation command current that is shared by each of the position detection sensors. The present invention is characterized by comprising a time measuring circuit which starts measurement in response to an output signal from a detection sensor and measures opening/closing operation time using a position detection signal from the position detection sensor.

(Function) In the present invention, switching devices such as circuit breakers, disconnectors, and earthing switches do not operate at the same time on the same line due to the interlock structure of the control circuit.
Since the normal operation mode is to switch the switches one after another, it is possible to determine the time of these switching devices by the order of their operation.

When measuring the operation time of a circuit breaker, the operation command current detection sensor installed in connection with the circuit breaker control circuit detects the rise of the current waveform, and the operating device selection circuit selects whether it is an operating device or a circuit breaker. At the same time, the time measuring circuit starts measuring. At the same time, the position detection sensor receiving circuit detects the operation start and operation end positions of the circuit breaker position detection sensor and transmits them to the time measurement circuit. The signal from this position detection sensor can be used in a time measurement circuit to accurately measure the operating time of the circuit breaker.

(Example) The present invention will be described below with reference to an embodiment shown in FIG.

In FIG. 1, the same reference numerals as in FIG. 4 indicate the same parts, so the explanation thereof will be omitted.

In the operating time measuring device for switching equipment of the present invention, the first
As shown in the figure, an output signal from an operation command current detection sensor 51a attached in connection with the circuit breaker control circuit is transmitted to an operating equipment selection circuit 531 via a cable 52. Also, regarding other switching equipment such as disconnectors and earthing switches,
Operation command current detection sensors 51b to 51e are attached to each control circuit, and each sensor 51b to 51
The output signal of e is transmitted to the operating device selection circuit 531 via the cable 52.

Therefore, the operating device selection circuit 531 selects each cable 52
is inputted to each operation command current detection sensor 51a to 5.
It has a function of selecting which of the detection sensors 51a to 51e the output signal is from the signal 1e. In this embodiment, the switching devices to be monitored, such as circuit breakers, disconnectors, and earthing switches, do not operate at the same time on the same circuit due to the interlock structure of the control circuit, but are operated one by one in sequence. Since this is a normal operation mode, each switching device can be identified by the order in which the operating currents flow through the control lines during operation.

This operating device selection circuit 531 selects operating devices and
After the "off" operation is selected, a digital signal S1 corresponding to the device and operation is transmitted to the time measurement circuit 561.

Further, each opening/closing equipment driving unit is equipped with position detection sensors 54a to 54e for the movable parts of the opening/closing equipment, and signals from these sensors 54a to 54e are sent to a position detection sensor receiving circuit 551 via a cable 52. It is now transmitted to In the position detection sensor receiving circuit 551,
The digital signal S1 of the operating device selection circuit 531 is also transmitted, and based on this digital signal s1, only the outputs s2 of the position detection sensors 54a to 54e of the corresponding devices are transmitted to the subsequent time measuring circuit 561, and the measurement results are sent to the processing device 57.
It is designed to be processed by

Next, the operation of the operating time measuring device for a switching device according to the present invention constructed as described above will be explained with reference to FIGS. 1 and 3. In FIG. 1, for example, for measuring the circuit breaker operation time, the operation command current detection sensor 51a detects the operating current waveform 41 flowing in the circuit breaker control circuit and sends it to the operating equipment selection circuit 531. It determines whether the operating device is a circuit breaker and whether it is in its “ON” or “OFF” operation.

After the operating device selection circuit 531 selects the device and its operation and detects the rising edge of the operating current waveform 41 in FIG. 3, the digital signal S1 corresponding to the device and operation is detected.
is the time measurement circuit 561 and the position detection sensor reception circuit 551
transmitted to.

The time measuring circuit 561 is started by the digital signal S1 and starts measuring time from the rising edge of the operating current waveform 41 in FIG. One position detection sensor receiving circuit 55
In 1, each position detection sensor 54a to 5
Among the output signals inputted from 4e, only the output signal S2 of the position detection sensor 54a of the corresponding circuit breaker is transmitted to the subsequent time measurement circuit 561 by the digital signal S1 transmitted from the operating device selection circuit 531. It has become.

In the time measuring circuit 561, time is measured from the rising edge of the operating current waveform 41 shown in FIG. When the circuit breaker receives this operating current command and starts operating, it is turned off at time t1 as shown by the position detection sensor 54a1 in FIG. Measure T.

Further, when time t2 has elapsed after the circuit breaker starts operating, the operation is completed. The time T2 is measured by detecting that the signal from the position detection sensor 54a2 turns OFF to indicate completion of the circuit breaker operation.

That is, this time T3 can be accurately measured as the actual opening/closing operation time T2 of the circuit breaker. This measurement data S is subjected to arithmetic processing and transmitted to a processing device 57 that performs storage, display, and output.

In this manner, in the operation time measuring device of the present invention, the operation command current detection signals are transmitted to the operation equipment selection circuit 531 in the order of operation by the operation command current detection sensors 51a to 51s in the operation time measurement section of the switching equipment. , it is possible to identify the device. Since only the signals from the position detection sensors 54a to 54e can be sent to the time measurement circuit 561 according to the determined device, the operating time of each device can be accurately measured.

In this way, in this embodiment, the operating time can be reliably measured for each switching device, so if an abnormality occurs in any of the devices, the occurrence of this abnormality and the device that caused it can be detected at an early stage, so that it can be quickly detected. It becomes possible to take remedial measures.

In addition, in the embodiment shown in Fig. 1, the operating time measuring section for each switching device is provided in one line, which is the minimum necessary and simple configuration. Moreover, it is extremely promising as a preventive maintenance system that can be reliably applied without the problem of complicating the configuration.

Furthermore, the operating device selection circuit 531 and the position detection sensor receiving circuit 551 used in this embodiment can be easily and compactly configured by combining gate elements such as LSI, AND and OR elements, etc. There are no issues affecting work or layout.

Note that the present invention is not limited to the above embodiments,
For example, if it is difficult to identify whether the opening/closing device is turned on or turned off using only the operation command signal, position detection sensors 54a, 54a, 54a, and the like shown in FIG.
is OFF when the operation starts or the operation is completed.

time T2 when the signal is set to zero or the signal is turned off.
By utilizing the switching from zero to (+) at time t1 and from zero to (+) at time t1, it is possible to accurately identify the "on" and "off" operations.

〔Effect of the invention〕

As described above, in the present invention, each line of the gas-insulated switchgear is provided with one common time measuring unit that measures the operation time of the switchgear for one line. It is possible to provide an excellent switching equipment operating time measurement system that can prevent equipment accidents, ensure a stable supply of power, and eliminate economic losses caused by accidents.

[Brief explanation of the drawing]

Figure 1 is a block circuit diagram showing an embodiment of the operating time measurement system for switchgear equipment of the present invention, Figure 2 is a single line diagram of a gas insulated switchgear that constitutes a substation, and Figure 3 is a general switchgear diagram. FIG. 4 is a time chart showing a method for measuring device operating time. FIG. 4 is a block circuit diagram showing an example of a conventional operating time measuring circuit. 31...Bus bar 32...Bus bar side disconnector 3
3... Circuit breaker 34... Track side disconnector 35
...Grounding switch 36...Bushing 51a~
51e... Operation command current detection sensor 52... Cables 54a to 54e... Position detection sensor 531... Operating device selection circuit 551... Position detection sensor receiving circuit 561... Time measurement circuit 57...・Processing device (8733) Representative patent attorney Yoshiaki Inomata (and 1 other person) 5:11 1st prisoner

Claims (1)

[Claims] In a line configured by connecting and arranging switching equipment such as circuit breakers, disconnectors, and earthing switches, this is provided in connection with each control circuit of each of the switching equipment, and detects the rise of the current waveform of the switching operation command current. an opening/closing operation command current detection sensor that outputs an output signal; a position detection sensor that is installed in each device drive section of each of the switching devices and detects drive start and end positions and issues a position detection signal; The measurement is started by the output signal of each opening/closing operation command current detection sensor and each position detection sensor of each opening/closing device, and the opening/closing operation time is determined by the position detection signal of the position detection sensor. 1. An operating time measuring device for switching equipment, characterized by comprising a time measuring circuit for measuring.