JP2645005B2 - Switching device operating time measurement system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a gas-insulated switchgear in which electric power equipment is compactly stored, and in particular, a preventive method suitable for confirming and monitoring the reliability of stored equipment. The present invention relates to an operation time measurement system that is a maintenance system.

(Prior Art) In recent years, the need for enhancing of substation equipment with increasing power supply amount in the rising and urban sites, using the superior SF ₆ gas insulation and arc-extinguishing, disconnectors, The so-called gas-insulated switchgear, in which substation equipment such as circuit breakers are housed and placed in a sealed container, and which has a compact installation volume per KV / A, is widely used, replacing conventional air-insulated switchgear. Running.

Although the gas insulated switchgear as described above has various advantages such as downsizing and reduction of the exposed charging part of the grounding tank, it is difficult to perform maintenance diagnosis due to high performance, and the maintenance and repair work time is increased. In the case where an abnormality occurs, there is a disadvantage that the reliability is significantly reduced.

Therefore, in order to improve the reliability of the entire gas insulated switchgear, efforts have been made to properly design and manufacture the device. However, as part of improving the quality of the power supply capacity, the reliability of the Confirmation and monitoring are required, and various effective means have been studied.

Problems at the present time will be described with reference to a layout diagram of a typical gas insulated switchgear as shown in FIG.

That is, as shown in FIG. 2, a lightning arrester 7, a transformer 8, a grounding switch 9, a disconnector 12, a current transformer 17, a circuit breaker 18, and a bus 19 are disposed in the sealed pressure vessel 2, 3 is filled with SF ₆ gas to electrically insulate the power application unit and the sealed pressure vessel 2 at the ground potential.

Further, in order to arrange the bus bar 19 in the sealed pressure vessel 2,
Insulating spacers 11 are provided at appropriate intervals, and
It is configured to be able to maintain the mechanical strength and dielectric strength.

Further, the main circuit is connected via the bushing 1 to the disconnector 12,
It is connected to a transformer 20 via a circuit breaker 18. In addition,
FIG. 2 shows a one-line power receiving main circuit,
The disconnecting switch 12 is connected to the power receiving main circuit (not shown) on the right side of FIG.
In some cases, power is supplied to the transformer 20 via the power supply.

On the other hand, the gas insulated switchgear is controlled by a switchboard 15, the voltage element is obtained by a transformer 8, the current element is obtained by a current transformer 17, and the main circuit switching and cutoff operation is performed by a switchgear via an operation cubicle 14. This is performed by giving an energizing signal to an operating device 13 of a similar type (disconnector, circuit breaker, ground switch).

As a mechanical drive source for switches, a predetermined pressure (for example, generally 15 kg / cm ² ) is obtained from the compressor equipment 16 and supplied to the operation device 13 via the operation cubicle 14.

On the other hand, the insulating spacer 11 is also used to separate the filling gas from the maintenance due to the disconnection and the arrangement configuration for maintenance. Therefore, each of the insulating spacers 11 is connected to the SF ₆ gas cylinder 6 via the gas cubicle 5 via the valve 4. Fill the compartment with SF ₆ gas,
The gas cubicle 5 allows the pressure to be determined.

In the gas insulated switchgear having such a structure described above, the characteristics of the SF ₆ gas, it is possible to miniaturize the storage device can be realized compact as a whole. (KV
-The occupied volume per A is small, and the effective use of the installation site can be achieved. In addition, it is possible to stack two to three stages by using the gas bus, and it is possible to stack the blocks. Therefore, there is an advantage that a large area can be obtained with a small area.

Furthermore, since the sealed pressure vessel is grounded, there is no danger of electric shock even when approaching during power application, and the power application unit is not directly exposed to environmental disturbances caused by salt damage, wind and rain, etc. It is not affected.

Further, switches such various is to be arc treated with high SF ₆ gas of extinguishing capability, the advantage that significant improvements in breaking capacity per main contact is possible.

On the other hand, the gas insulated switchgear has the above-mentioned advantages, but also has the following disadvantages.

That is, the overall size of the device is smaller than that of the air-insulated switchgear, and the allowable dimensional range of disassembly or reassembly at the time of maintenance and inspection of storage equipment has been reduced. And the working efficiency is significantly reduced.

In addition, the SF ₆ gas sealed inside the container is expensive, requires advanced manufacturing technology to prevent gas leakage to the outside, and has a large kv / mm due to its good insulation, resulting in a small drop in gas pressure. In some cases, the insulation strength is greatly affected, and there is also a problem that urgent and advanced gas leak repair is required.

Further, since the sealed pressure vessel is used, there is a problem that the storage device cannot be monitored visually.

In the replacement due to wear of the main contacts of the various switching devices, time consuming to recover and re-filling operation of the SF ₆ gas, some disadvantage downtime gas insulated switchgear is increased.

In spite of the advantages and disadvantages described above, the advantages of the advantages are large in terms of performance, so the spread of gas insulated switchgear is remarkable, but when the number of installation locations increases and the mass production system is taken, maintenance and Variations in the preparation and quality of the emergency restoration system have become a problem that cannot be ignored. For this reason, research and development of a preventive maintenance system for confirming the reliability of the normal operation state of operation and performing early detection and monitoring when an abnormality occurs has been promoted.

FIG. 3 shows a single-line diagram of the gas-insulated switchgear constituting the substation, separately from FIG. In FIG. 3, a switching disconnector 32 is attached to the main bus 31,
A breaker 33, a line-side disconnector 34, and an installation device 35 are connected to each end of the line, and are connected to an overhead transmission line via a bushing 36.

Recently, in the gas insulated switchgear configured as described above, the demand for the above preventive maintenance system is increasing more and more. Of the monitoring items in this preventive maintenance system,
One of the most important items is monitoring the operation time of the switchgear.

That is, since the switchgear has its own movable part and moves at a considerably high speed, the probability of occurrence of a failure is higher than that of a stationary device such as a bus or a transformer, and a disconnector, circuit breaker, or the like. Are major components of the substation, and their failures are highly likely to have a major obstacle to stable operation of the substation. Therefore, it is required to measure the operation time of each switching device and to establish a system capable of taking a countermeasure immediately when an abnormality of the measured value is detected.

FIG. 4 shows an example of a method for measuring the operation time of such a switchgear. In FIG. 4, reference numeral 41 denotes an operation command current waveform flowing through a control line of a control circuit of the switching device, and reference numeral 42 denotes a stroke curve of a movable portion of the switching device. Also in the figure
Reference numerals 43 and 44 denote output waveforms of the position detection sensor of the movable part of the switchgear attached to the drive unit of the switchgear, which are turned ON and OFF at positions corresponding to the respective ends of the stroke curve.

As a configuration of a time measuring circuit used in such an operation time measuring method, for example, there is one as shown in FIG.

In FIG. 5, reference numeral 51 denotes an operation command current detection sensor attached to a control line of a control circuit of the switchgear, the output of which is transmitted to a receiver 53 via a cable 52. Reference numeral 54 denotes a position detection sensor for a movable portion of the opening / closing device, which is attached to the opening / closing device driving portion. Conventionally, a microswitch, a proximity sensor, or the like is used. Output signals of these position detection sensors 54 are transmitted to a receiver 55 via a cable 52.
It is transmitted to. 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. 4, and measures the time from this rise to the start of operation (T _{1 in} FIG. 4) and the operation. The actual opening / closing operation time (T _{2 in} FIG. 4) from the start to the end of the operation is measured, and the measured data is subjected to arithmetic processing and transmitted to the processing device 57 that performs storage display output and the like. ing.

When such a time measurement system is applied to an actual substation, it is most desirable to provide an independent time measurement system for each switchgear as shown in FIG. 3. Requires time measuring circuits 56 as shown in FIG. 5 for the number of switchgears, which complicates the configuration and is difficult to realize from an economical point of view. In addition, the fifth
In the figure, the equipment at the subsequent stage from each of the receivers 53 and 55 is housed in a control panel installed in the field or in a control room. Therefore, it is necessary to provide the time measuring circuit 56 for each switching device independently. As a result of increasing the dimensions of the board, there is also a problem that the arrangement is hindered.

(Problems to be Solved by the Invention) As described above, in the conventional gas insulated switchgear, the operating time of the gas insulated switchgear cannot be provided because the operation time measurement system optimal for the operation of the substation cannot be provided. Since it was not possible to confirm the reliability of the normal condition and to perform early detection and monitoring when an abnormality occurred, a large amount of time was required for maintenance and inspection work and repair work in the event of an accident.

The present invention has been proposed to eliminate the above-mentioned disadvantages, and its object is to prevent a gas-insulated switchgear accident from occurring as a preventive maintenance system for a gas-insulated switchgear, and to stably supply power. Another object of the present invention is to provide a switchgear operating time measurement system which is optimal for eliminating economic loss caused by an accident and has a simple configuration.

[Configuration of the Invention] (Means for Solving the Problems) A switching device operating time measuring system according to the present invention provides a circuit breaker operation for measuring the operating time of a circuit breaker for each line or a plurality of lines of a gas insulated switchgear. A feature of the configuration is that a time measuring unit and a switchgear operating time measuring unit for measuring the operating time of a switchgear such as a disconnecting device or a grounding device other than the circuit breaker function independently of each other. And

(Operation) The operation of the present invention having the above-described configuration is as follows.

That is, disconnecting switches and grounding devices, which are switching devices other than circuit breakers, do not operate at the same time due to the interlock configuration, and are switched one by one even in consideration of other lines. This is a normal operation, and therefore, regarding the time measurement of these switching devices, it is possible to determine the devices in the order of operation. In the present invention, a common switching device operating time measuring unit is provided for the switching devices other than these circuit breakers, so that the measuring unit can accurately measure the operating time of each device. For circuit breakers that operate collectively over multiple lines or that may be operated during the operation of other switchgear, the circuit breaker operation time measurement unit provided independently ensures that the operation time is ensured. Can be measured. Therefore, in the present invention, since the operation time can be reliably measured for each switching device, when an abnormality occurs, the abnormality can be detected at an early stage, thereby contributing to prevention of a major accident. Furthermore, the present invention provides an operating time measuring unit that is roughly divided into a measuring unit of a circuit breaker that cannot perform time measurement by a common time measuring unit with another switching device and a measuring unit of other switching devices. Since the configuration is as simple as necessary and simple enough, there is no problem that the configuration becomes complicated, and it is extremely effective in actual application.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to FIG. The same parts as those of the conventional type shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

* Configuration of Embodiment As shown in FIG. 1, in this embodiment, a circuit breaker operating time measuring unit and a disconnector grounding device operating time measuring unit are provided so as to function independently. .

First, the circuit configuration of the circuit breaker operating time measuring unit is exactly the same as the prior art shown in FIG. 5, and the signals of the operation command current detecting sensor 51 and the position detecting sensor 54
Transmitted to the receivers 53 and 55 via 52, the outputs of the receivers 53 and 55 are input to the time measurement circuit 56, and the measurement results are subjected to arithmetic processing of the measurement data and to perform storage display output and the like. The data is transmitted to the processing device 57. Here, up to the time measurement circuit 56, the circuit breaker side has an independent configuration.
57 is common to the disconnector grounding device operating time measuring unit described later.

On the other hand, the configuration of the disconnector grounding device time measuring unit is as follows. That is, the operation command current detection sensor 51 is attached to the control line of the control circuit of each switching device,
The signal of 51 is connected to the operating device selection circuit 531 via the cable 521.
It is transmitted to. After the operating device and the “on” and “off” operations are selected by the operating device selection circuit 531, a digital signal corresponding to the device and the operation is transmitted to the time measurement circuit 561. In addition, each open / close device drive unit has a position detection sensor for the open / close device movable unit.
53 is attached, and the signal of each sensor 53 is transmitted to the position detection sensor receiving circuit 551 via the cable 521. Here, the position detection sensor receiving circuit 551 includes:
The digital signal of the operating device selection circuit 531 is also transmitted, and only the output of the position detection sensor of the corresponding device is transmitted to the subsequent time measurement circuit 561 by this digital signal.

* Operation of the embodiment In the present embodiment having the above-described configuration, first, the circuit breaker is provided with a dedicated circuit breaker operation time measuring unit. The operation time can be accurately measured by the time measurement circuit 56 via the receivers 53 and 55 based on the detection signal of the detection sensor 54. Further, in the operation time measuring unit of the disconnecting switch and the grounding device, since the operation command current detection sensor 51 transmits a detection signal of the operation command current to the operation device selection circuit 531 in the order of operation, the device can be identified. is there. Then, since only the signal of the position detection sensor 54 corresponding to the determined device is sent to the time measurement circuit 561, the operation time of each device can be accurately measured. As described above, in the present embodiment, since the operation time can be reliably measured for each switching device, when an abnormality occurs in any of the devices, the occurrence of the abnormality and the device in which the abnormality has occurred can be detected early, and Remedial measures can be taken.

In addition, in the present embodiment, the operation time measurement unit is largely divided into a measurement unit of a circuit breaker that cannot perform time measurement by a time measurement unit common to other switching devices and a measurement unit of other switching devices. Since the configuration is simple and requires only a minimum of two, there is no problem that the configuration is complicated as in the case where a dedicated measurement unit is provided for each device, and it is extremely promising as a preventive maintenance system that can be applied in practice. It is.

Further, the operating device selection circuit 531 and the position detection sensor receiving circuit 551 used in the present embodiment include a gate element such as an LSI,
It can be easily and compactly configured by combining D, OR elements, etc., and there is no problem in this respect that affects the work and arrangement.

* Other Embodiments Note that the present invention is not limited to the above embodiments. For example, when it is difficult to discriminate between "ON" and "OFF" operations of the switchgear, only the operation command signal is used. By inputting the output signal of the position detection sensor as shown in the figure to the operating device selection circuit 561 as shown by the broken line in FIG. 1, accurate identification becomes possible.

Further, in the case of a circuit breaker on a line side line, there is a circuit breaker which continuously operates in a short time in each phase independently, and a circuit breaker which operates three phases collectively such as a circuit breaker of a transformer line or a shunt reactor line. For this reason, the circuit breaker may have a configuration in which the time measurement circuit is independent for each line or each phase as necessary.

[Effects of the Invention] As described above, in the present invention, the circuit breaker operating time measuring unit and the operating time measuring units of other switchgears are independently provided for each line or a plurality of lines of the gas insulated switchgear. The simple means that the gas insulated switchgear can be prevented from occurring, despite the simple and minimal structure required, and the stable supply of power and the It is possible to provide an excellent switchgear operating time measurement system capable of eliminating economic loss and the like.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a switchgear operating time measuring system according to the present invention, FIG. 2 is a skeleton diagram of a general gas-insulated switchgear, and FIG. 3 is a gas-insulated switchgear constituting a substation. FIG. 4 is a time chart showing a general method for measuring the operation time of a switching device, and FIG. 5 is a circuit diagram showing an example of a conventional operation time measurement circuit. 1 ... bushing, 2 ... sealed pressure vessel, 3 ... filling gas, 4
... Valve, 5 ... Gas cubicle, 6 ... Gas cylinder, 7
... lightning arrester, 8 ... transformer, 9 ... grounding switch, 11 ... insulating spacer, 12 ... disconnector, 13 ... operator, 14 ... cubicle, 15
... switchboard, 16 ... compressor equipment, 17 ... current transformer, 18 ... breaker, 19 ... bus, 20 ... transformer, 31 ... main bus, 32,34 ... disconnector, 33 ... breaker, 35 ... grounding device, 36… Bushing, 41
… Operation command current waveform, 42… Stroke curve, 43,44…
Output signal waveform of position detection sensor, 51: operation command current detection sensor, 52, 521: cable, 53, 55: receiver, 54: position detection sensor, 56,561: time measurement circuit, 57: processing device, 53
1… operating device selection circuit, 551… position detection sensor receiving circuit.

Claims (1)

(57) [Claims] A system for measuring the operating time of a switching device such as a circuit breaker, disconnector, grounding device, etc., in a gas insulated switchgear accommodating power equipment in a compact manner. A circuit breaker operating time measuring unit that functions independently of each other, and a disconnecting switch, a grounding device, and the like, which are switching devices other than the circuit breaker, are provided in common. A switchgear operating time measurement system, wherein a switchgear operating time measurement unit that performs both the output and the position detection sensor is provided so as to function independently of each other.