JP2975716B2 - Operating time measurement device for power switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated power switchgear in which power devices are compactly stored in a grounded metal container filled with an insulating gas, and is suitable for preventing and confirming the reliability of the storage devices. The present invention relates to a device for measuring the operation time of a power switching device acting as a maintenance system.

[0003]

2. Description of the Related Art In recent years, there has been a need for strengthening of substation equipment in accordance with soaring land and an increase in power supply in urban areas.
The so-called gas-insulated switchgear, in which substation equipment such as a circuit breaker is housed and placed in a sealed grounded metal container, and the installation volume per KVA is reduced, has become popular, replacing conventional air-insulated switchgear. It is running.

The gas insulated switchgear described above has various advantages such as downsizing and reduction of the exposed charged portion of the grounded metal container, but has difficulty in maintenance diagnosis due to high performance and increases maintenance and repair work time. For example, when an abnormality occurs inside the container, there is a defect that the reliability is significantly reduced.

Therefore, conventionally, in order to improve the reliability of the gas-insulated switchgear as a whole, an appropriate design and design of the device have been proposed.
Although efforts have been made to manufacture the device, it is necessary to confirm and monitor the reliability of the entire device as part of improving the quality of the power supply capability, and various effective means have been studied. One of the most important items of such monitoring means is to monitor the operation time of the switchgear.

[0006] That is, since the switchgear has a movable part itself and moves at a considerably high speed, there is a high probability that a malfunction will occur as compared with stationary equipment such as a bus or a transformer, Circuit breakers, etc. are the main components of the substation,
These troubles are likely to seriously hinder stable operation of the substation. Therefore, it is required to establish a preventive maintenance system that measures the operating time of each switchgear and, when an abnormality in the measured value is detected, can quickly take countermeasures.

FIG. 3 shows an example of a method for measuring the operation time of such a switchgear. In FIG. 3, 41
Is an operation command current waveform flowing through the control line of the control circuit of the switching device, 42 is an output waveform of the operation command current detection sensor receiver,
43 is a stroke curve of the movable part of the opening / closing device. In the figure, reference numerals 44 and 45 denote output waveforms of position detection sensors on the “insert” side and the “trip” side of the switchgear movable unit attached to the drive unit of the switchgear, respectively. ON and OFF at corresponding locations.

FIG. 4 shows an example of a configuration of a time measurement circuit used in such an operation time measurement method. In FIG. 4, reference numerals 51 c and 51 o denote operation command current detection sensors on the “input” side and “trip” side attached to the control line of the control circuit of the switchgear. 53. 54c, 54
o is a position detection sensor on the “input” side and “trip” side of the movable device of the switching device attached to the driving device of the switching device,
Conventionally, micro switches, proximity sensors, and the like have been used. Output signals of these position detection sensors 54c and 54o are transmitted to the receiver 55 via the cable 52.

Reference numeral 56 denotes a time measurement circuit, which starts time measurement at the fall of the operation command current detection waveform 42 as shown in FIG. The ON and OFF states of the outputs are sampled and all of them are temporarily stored in the memory 58. Then, after the measurement is completed, the time from the ON / OFF state of the operation command and the output of the operation position detection sensor to the start of the operation from the fall of the operation command signal (T _{1 in} FIG. 3).
And the open / close operation time (T _{2 in} FIG. 3) from the start of the operation to the end of the operation, respectively, and transmit them to the processing device 57 which performs storage display output and the like.

[0010] In such an operation time measurement circuit, not only the independent operation of the "closing" operation and the "tripping" operation of the switchgear, but also the operation command and the output signal of the operation position detection sensor are stored in the memory. Therefore, the continuous operation of the breaker
It is also possible to accurately determine and measure the operations of "trip", "trip-time wait-insertion-trip".

The following method has been proposed in Japanese Patent Application No. 62-062501 as an operation command detection method applied to the open / close time measurement circuit as shown in FIG. That is, FIG. 5 shows a control signal detection circuit of the prior art circuit breaker. The closing circuit includes a closing command input terminal 1, a changeover switch 2, an impedance 3, and a closing coil 4a provided in parallel with the impedance 3. The current flowing through this closing coil 4a is:
It is detected by the feed-through type current transformer (control current detecting means) 5a.

A control line 6a is provided in the through-type current transformer 5a.
Penetrates at least once. The output signal of the feed-through type current transformer 5a is input to a pulse shaping circuit (signal waveform shaping means) 8a via an impedance 7a. Here, the pulse shaping circuit 8a is a receiver that captures the rise of the current I of the input signal and outputs a waveform at a timing that matches the rise. For example, the pulse shaping circuit 8a is a combination of a Schmitt trigger circuit and a monostable multivibrator circuit. Be composed.

On the other hand, the trip circuit comprises a trip command input terminal 9, an impedance 10, and a trip coil 4b provided in series with the impedance 10. The current flowing through the trip coil 4b is detected by a through current transformer (control current detecting means) 5b on the trip side. The control line 6b passes through the through-type current transformer 5b at least once. Trip type current transformer 5b on the trip side
Is input to a pulse shaping circuit (signal waveform shaping means) 8b via an impedance 7b, and a waveform is output at a timing matching the rise of the current I, similarly to the input side.

In the control signal detecting device for a power switchgear configured as described above, first, in the case of a closing operation, when a control current flows through the control circuit in response to a closing command, this current is applied to the through-type current transformer on the closing side. It is detected at 5a. As a result,
The output signal of the feed-through type current transformer 5a is input to a pulse shaping circuit 8a, and a detector output pulse is output from the circuit 8a. The time delay from the rise of the control current to the output of the detector output pulse is usually set to be within 1 ms, and each position detection sensor measures the time until the output pulse based on the detector output pulse. Thus, the operation of the device can be monitored.

[0015]

However, the prior art as described above has the following disadvantages. That is,
When the device is operating, the operation of the relay included in the control circuit,
A surge current may occur in the control line due to a wraparound in a control circuit including a control cable, and the surge current may cause a malfunction of the operation time measuring device. FIG. 6 shows an example of such a malfunction due to the surge current.

In FIG. 6, a surge current 62 is induced in the circuit breaker trip side control circuit when the auxiliary switch b contact is turned off after the circuit breaker closing operation, and the trip side operation command current detection sensor is generated by the surge current. Works. In the processing device 57, the time from the fall of the trip-side command detector output 64 to the start of operation (T _{3 in} FIG. 6) and the start of operation (fall of the trip-side position detection sensor output waveform in FIG. 6) Opening / closing operation time from time to the end of operation (T in FIG. 6)
₄₎ attempts to calculate a, but measurement of T ₄ is aborted by measuring time set by the program because there is no change in the output 66 of the input-side position detection sensor, a measurement result that the breaker tripping inoperative Would.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and does not malfunction due to a surge current or the like induced on a control line, and accurately operates the switching device. It is an object of the present invention to provide an operation time measuring device for a power switchgear which can measure the operating time.

[Structure of the Invention]

[0019]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an operation command current detecting means attached to a control circuit for turning on and off a power switching device, and an opening / closing device attached to the switching device. In a power switchgear operating time measuring device comprising a position detecting means of a switch movable part and a measuring means for measuring the operating time of the switchgear from the output signals of these detecting means, A switch contact is connected, and a detection signal of the operation command current detecting means is compared with an output from the auxiliary switch contact to determine whether the operation command current detection signal is appropriate.

[0020]

In the operation time measuring device for a power switchgear of the present invention having the above-described configuration, when the rise of the control current of the switch is detected by the operation command current detecting means,
This detection signal is compared with the output from the auxiliary switch contact to detect when the operating current detecting means detects the closing operation command, when the switching device is in the ON state, and when the operating current detecting means detects the tripping operation command. When the switching device is in the tripped state, it is determined that the detection of the operation command current is inappropriate, and the operation time is not measured, thereby preventing the operation time measurement device from malfunctioning.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the operating time measuring apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of an operation time measuring device of a power switchgear to which the present invention is applied, and FIG. 2 is a time chart showing a method of measuring the operation time.

In FIG. 1, reference numerals 51c and 51o denote operation command current detection sensors on the "input" side and "trip" side attached to the control line of the control circuit of the switchgear (corresponding to the operation current detection means of the present invention). ) And the output is cable 5
2 to the receiver 53. Reference numerals 54c and 54o denote position detection sensors (corresponding to position detection means of the present invention) on the "closing side" and "tripping side" of the movable part of the switchgear attached to the switchgear drive unit. Etc. are used. These position detection sensors 5
4 is transmitted to the receiver 55 via the cable 52.

Reference numerals 59c and 59o denote auxiliary switch contacts on the "close" side and "trip" side of the switchgear. The outputs of the auxiliary switches 60c on the "close" side and "trip" side are connected via a cable 52. , 60o. Reference numeral 56 denotes a time measuring circuit (corresponding to measuring means of the present invention), which measures the operating time of the switchgear from the outputs of the receivers 53 and 55 and the auxiliary relays 60c and 60o, stores the measured time in the memory 58, and further outputs the display. And so on.

The operation of the operating time measuring apparatus according to the present embodiment having such a configuration is as follows. For example, when the operation command current detection sensor 51c on the “input” side detects the rise (input command) of the operation command current detection waveform 63 shown in FIG. 2, this detection signal is sent to the receiver 53 via the cable 52. The signal is sent to the time measuring circuit 56. At the same time, the outputs 68 and 69 of the auxiliary switch contacts 59c and 59o on the [closing] side and the "tripping" side are connected to the auxiliary relay 60.
Input to the time measurement circuit 56 via c and 60o.

In this time measuring circuit 56, it is determined from the outputs 68, 69 of the auxiliary switch contacts 59c, 59o whether the switching device is in the "ON" state or the "OFF" state. At this time, when the switchgear is in the “tripped” state, the output signal from the operation command current detection sensor 51c is correct, and the time measurement circuit 56 starts time measurement.
Then, the output 61 of the operation command current detection sensor 51c and the position detection sensor 54c at predetermined time intervals at predetermined time intervals,
The ON and OFF states of 66 are sampled, and all of them are temporarily stored in the memory 58. And after the measurement is completed,
Time from the ON / OFF state of the outputs 61 and 66 of the operation command and operation position detection sensors 51c and 54c to the start of the operation from the fall of the operation command signal (T _{1 in} FIG. 2).
And the opening / closing operation time (T _{2 in} FIG. ₂ ) from the start of the operation to the end of the operation, respectively, and transmit them to the processing device 57 that performs storage display output and the like.

On the other hand, when the output signal 61 from the operation command current detection sensor 51c is detected, the auxiliary switch contact 5
If it is determined from the outputs 68 and 69 of 9c and 59o that the switching device is in the "tripped" state, the output signal 61 from the operation command current detection sensor 51c is erroneous due to surge current or the like. Therefore, in such a case, the time measurement circuit 56 does not perform the time measurement as described above, and does not store data in the memory 58 or output to the processing device 57.

Similarly, when the operation command current detection sensor 51o on the “trip” side detects the trip command 62,
In the time detection circuit 56, the auxiliary switch contacts 59c,
It is determined from the outputs 68 and 69 of 59o whether the switchgear is in the “closed” state or the “tripped” state. When the switchgear is in the “closed” state, the switching device is pulled in the same manner as when detecting the operation command current on the “closed” side. measured respectively time T ₃ to the start operation operation starting from the time until the operation end closing operation time T ₄ from the falling edge of the operation command signal when operating off.

On the other hand, from the outputs 68 and 69 of the auxiliary switch contacts 59c and 59o, when the switching device is in the "trip" state, the output signal 62 from the operation command current detection sensor 51o is erroneous due to surge current or the like. Things. Therefore, in such a case, the time measurement circuit 56 does not perform the time measurement as described above.

As described above, according to the present embodiment, when the switchgear is in the closed state when the closing command is detected, and when the switchgear is in the released state when the tripping command is detected, the time required for the switching operation can be reduced. Since it is configured not to measure,
An erroneous measurement of the operation time due to an erroneous detection of a command signal caused by a surge or the like is prevented.

[0030]

According to the present invention, when an operation command signal of a switchgear is detected, the operation command is collated with the state of the auxiliary switch contact to check whether the detected operation command signal is correct or a surge current. The present invention provides an excellent operation time measuring device that accurately measures the operation time of a switchgear without malfunctioning due to a surge current or the like induced in a control line, because it is possible to determine whether the operation is erroneous due to the above. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an operation time measuring device for a power switchgear according to the present invention.

FIG. 2 is a time chart showing an operation of the operation time measuring device of FIG. 1;

FIG. 3 is a time chart showing a general method of measuring operating time of a switching device.

FIG. 4 is a block diagram showing an example of a conventional operation time measuring device for a power switching device.

FIG. 5 is a circuit diagram showing an example of a control signal detection circuit of the circuit breaker.

6 is a time chart showing a malfunction of the switching device operating time measuring device due to a surge current in the operating time measuring device of FIG. 4;

[Explanation of symbols]

 51c, 51o ... operation command current detection sensor 53 ... receiver 54c, 54o ... position detection sensor 55 ... receiver 56 ... time measurement circuit 57 ... processing device 58 ... memory 59c, 59o ... auxiliary switch contact 60c, 60o ... auxiliary relay

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 33/59 H01H 33/00

Claims (1)

(57) [Claims] An operation command current detecting means attached to a switching circuit for turning on / off a power switch, a position detecting means for a switch movable section attached to the switch, and an output signal from these detecting means. In the operating time measuring device for a power switchgear having a measuring means for measuring the operating time of the switchgear, an auxiliary switch contact of the switchgear is connected to the measurement output means, and a detection signal of the operation command current detecting means is provided. An operation time measuring device for a power switching device, wherein the operation time measurement device determines the suitability of an operation command current detection signal by comparing an output from an auxiliary switch contact.