JP4578219B2 - Vacuum circuit breaker monitoring device - Google Patents

Description

The present invention relates to a vacuum circuit breaker monitoring device for monitoring a malfunction or deterioration degree of a breaker function in a vacuum circuit breaker installed in a switchboard, and is a compatible remote monitoring secondary that can be easily added to an existing switchboard and remotely monitored. The present invention relates to a monitoring device for a vacuum circuit breaker provided with a plug.

The switchboards installed at substations and receiving / distributing stations are equipped with oil-filled, magnetic, and vacuum circuit breakers for closing and opening the power system. When a predetermined service life has passed, it is necessary to replace the vacuum breaker with a new one as appropriate. However, the latest type of vacuum circuit breaker has an unprecedented function and is miniaturized, and the control signal transmission connector (secondary plug) is also miniaturized. Since the concave side) cannot be fitted to the latest vacuum circuit breaker side secondary plug (convex side), an adapter harness called interchangeable remote monitoring secondary plug is interposed, the existing panel side secondary plug and the latest secondary plug Can be connected to each other and has compatibility.

  The function of remotely monitoring the malfunction and deterioration degree of the shut-off function is pre-installed in the latest type switchboard, but not in the existing old-model product. Therefore, when replacing the vacuum circuit breaker of the existing switchboard with the latest model, if a secondary plug is installed that can remotely monitor the disconnection function, it will be possible to quickly grasp the malfunction and deterioration degree of the vacuum circuit breaker, and It is highly functional and effective for maintenance and inspection.

  Patent Document 1 describes a configuration in which a control current and an operation time of a driving source involved in an opening / closing operation of a vacuum switch are measured, and a deterioration state of a mechanism section in the vacuum circuit breaker is monitored.

JP-A-8-180777

  However, when the remote monitoring function is added to the existing switchboard, there has been a problem that requires extensive modification of the switchboard.

  SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and when replacing an existing switchboard with the latest vacuum circuit breaker, a vacuum circuit breaker monitoring device that can easily monitor the malfunction and degree of deterioration of the breaker function in the distance. The purpose is to provide.

The present invention relates to an operation command detection means for detecting an operation command signal generated at the time of “on” or “off” operation of the vacuum circuit breaker on the switchboard in which the vacuum circuit breaker is installed , and an auxiliary switch contact of the vacuum circuit breaker The opening / closing time detecting means for detecting the opening / closing time signal, the storage means for storing operation state data set in advance for the vacuum circuit breaker, the operation command signal is generated by the operation command detection signal and the opening / closing time detection signal. The operation time from the time point to “ON” or “OFF” of the vacuum circuit breaker is calculated, and the calculation processing result is compared with the operation state data stored in the storage means to determine the abnormality of the vacuum circuit breaker. and control monitoring means for monitoring, in the monitoring device of a vacuum circuit breaker and a display means for displaying the monitoring results, set up a secondary surveillance plug for remote monitor to the power distribution board inside, far before Sharing, ABS board inside surveillance Of the secondary surveillance plug installed, the secondary surveillance plugs, switching signal detecting for detecting an input of a cutoff command signal input for signal detection power transistors and the vacuum circuit breaker for detecting an input of the feed command signal of the vacuum circuit breaker Power transistor, two auxiliary switch contacts that are turned on / off in the same manner as the on / off of the vacuum circuit breaker, and opposite on / off states, and one auxiliary switch contact on / off A power transistor for detecting a signal, a power transistor for detecting an ON / OFF signal of the other auxiliary switch contact, a secondary plug on the latest vacuum circuit breaker side, a secondary plug on the existing panel side, and a LAN cable And a LAN connector for connecting to a personal computer via a remote monitoring device for remotely monitoring the malfunction and deterioration of the breaker function of the vacuum circuit breaker .
〔The invention's effect〕

According to the present invention when exchanging the latest type vacuum circuit breaker with respect to existing switchboards, the monitoring device of a vacuum circuit breaker that can be easily remote monitor a failure or degradation degree of blocking function can be provided and child are.

Therefore, according to the present invention, since a secondary monitoring plug having a monitoring function can be installed between the newly installed vacuum circuit breaker and the switchboard control circuit, the operation status of the vacuum circuit breaker can be easily monitored remotely. In addition, it has the advantage of being able to easily manage the trend and determine the inspection time.

The embodiment of the present invention includes a switch for installing a vacuum circuit breaker, a detecting means for detecting an operation command signal generated when the vacuum circuit breaker is turned “ON” and / or “OFF”, and an auxiliary switch contact opening / closing. signal detecting means for detecting a time, and a control device for computing these detected signal data, a monitoring device of a vacuum circuit breaker that includes a display device, two for remote monitor to the switchboard in in switchboard A secondary monitoring plug is installed, and the secondary monitoring plug detects an input signal detection power transistor that detects an input of a closing command signal of the vacuum circuit breaker, and a cut signal detection that detects an input of a blocking command signal of the vacuum circuit breaker. Power auxiliary transistor, two auxiliary switch contacts that are turned on / off in the same way as the on / off of the vacuum circuit breaker and opposite to each other, and the on / off signal of one auxiliary switch contact detection Power transistor that detects the ON / OFF signal of the other auxiliary switch contact, the secondary plug on the latest vacuum circuit breaker side and the secondary plug on the existing panel side, and a personal computer via a LAN cable And a LAN connector to be connected .
〔Example〕

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 7 show an embodiment of a compatible remote monitoring secondary plug device according to the present invention.

  FIG. 8 is a view of a state in which the door is opened and the inside of the vicinity where the vacuum circuit breaker is installed is seen in the switchboard which is the subject of the present invention.

  1 is a switchboard, 2 is a vacuum circuit breaker, 3 is a secondary monitoring plug, that is, a control circuit plug connector, and 4 is a cable.

  FIG. 7 is a structural diagram showing the inside of the vacuum circuit breaker.

  5 is a closing spring of the vacuum circuit breaker, 6 is a breaking spring, 7 is an auxiliary switch, 8 is a control circuit unit, and 9 is an operation counter for measuring the number of operations of closing and breaking. The main power supply system is turned on and off by driving the closing spring 5 and the cutoff spring 6 through the operation mechanism in accordance with a control signal from the control circuit unit 8 based on a command from the control room. A plurality of contact groups of the auxiliary switch 7 are opened and closed in conjunction with the closing and closing operations by the closing spring 5 and the blocking spring 6.

  FIG. 1 is a signal time chart showing the operation of the embodiment of the present invention, and FIG. 2 is a circuit diagram thereof.

  In FIG. 2, 10 is a plug box, 21 is a main body of the vacuum circuit breaker 2, and 22 is a contact group of the auxiliary switch 7.

  3 to 5 are views showing the appearance of the plug box 10, and are a right side view, a plan view, and a left side view, respectively.

The plug box 10 includes a case 11, a power terminal block 12, a LAN (local area network) cable connection connector 13, a display panel 14, a secondary plug (convex) 15 on the latest vacuum circuit breaker side , an existing panel side It consists of secondary plug (concave) 16. The plug box 10 is installed inside the switchboard 1, the door of the switchboard 1 is opened at the time of inspection, and is displayed on the display panel 45 (display means).

  FIG. 6 is a diagram illustrating the concept of the embodiment.

  In these figures, TR1 is an input signal detection power transistor, and TR2 is a cut signal detection transistor, which detects an input signal and a cut signal and sends them to the personal computer P / C41. The closing command signal 24 and the breaking command signal 25 of the vacuum circuit breaker 2 are pulses having a certain time width. When the input command signal 24 is input, the transistor TR1 is turned on, and an input signal pulse of level “H” is detected. When the cutoff command signal 25 is input, the transistor TR2 is turned on, and an incoming signal pulse of level “H” is detected. The closing command signal 24 and the shutoff command signal are displayed together as an operation command signal 42.

  Since the vacuum circuit breaker 2 has an operation delay of a certain time, when moving from the shut-off state to the on-state, a time delay after the on-signal is detected, and also when turning off from the on-state to the shut-off state, There is a time delay since it was detected.

The auxiliary switch contact a is an on / off state that is the same as when the vacuum circuit breaker 2 is turned on and off, and the auxiliary switch contact b is a contact that is turned on / off in the opposite direction. The power transistor TR4 detects an on / off signal of the auxiliary switch contact a, and the power transistor TR3 detects an on / off signal of the auxiliary switch contact b. The detection signals 42 and 43 are detected by a personal computer ( P / C ) sent to 41. In the personal computer ( P / C ) 41, the control monitoring means 43 calculates the detection signal levels “H” and “L” and the respective signal generation timings, and stores them in the storage area, ie, the storage means 44 as data. Remember. The storage unit 44 stores a preset operation situation.

Since the shut-off function does not need to be constantly monitored, the personal computer ( P / C ) is not installed in the monitoring control room, but is taken near the switchboard and connected, and monitored appropriately. However if you want to constantly monitor in conjunction with other functions, installed in the monitoring control room away, connecting via LA N cable is preferred.

  As described above, the vacuum circuit breaker 2 operates after the input command signal 24 is input, and there is a time delay until the main power supply system is closed, but this gradually becomes longer with long-term use. Similarly, the time from when the shut-off drive command signal 25 is input until the main power system is shut off is also delayed. These causes are mainly caused by the sag of the closing / shut-off spring and the lack of grease in the link mechanism connected thereto, resulting from increased friction and the like.

  In FIG. 1, VCB indicates a vacuum circuit breaker 2. When the vacuum circuit breaker 2 is operating normally, the time from the rise timing of each of the VCB on signal and the VCB off signal to the operation of the vacuum circuit breaker 2, that is, the on time of the VCB operation is “normal”. Within time range. In addition, when the ON / OFF signals of the auxiliary switch contacts a and b rise and fall, the VCB input signal and the VCB off signal are within the “normal” time width when the signal is normal.

  When the vacuum circuit breaker 2 is abnormal, the VCB operation has a long delay time as shown by the dotted line, and similarly, the rise and fall timings of the ON / OFF signals of the auxiliary switch contacts a and b also have a long delay time.

Since the operation status data of the vacuum circuit breaker 2 is stored in the personal computer ( P / C ) , the delay time can be grasped at an arbitrary time. Therefore, if this stored data is graphed every predetermined period, so-called trend management can be performed, so that the change in the degree of deterioration can be known from the delay time, and the inspection time can be easily determined.

In this way, with a switchboard 1 which established the vacuum circuit breaker 2, a secondary surveillance plug 3 installed in該配board 1, the secondary surveillance plug 3 detects the input of the feed command signal of the vacuum circuit breaker The power transistor for detecting the input signal and the power transistor for detecting the cut-off signal for detecting the input of the shut-off command signal of the vacuum circuit breaker, and the on / off state same as the turning on / off of the vacuum circuit breaker, and the opposite on / off states. State-of-the-art vacuum breaker, two auxiliary switch contacts that enter the state, a power transistor that detects the on / off signal of one auxiliary switch contact, and a power transistor that detects the on / off signal of the other auxiliary switch contact a secondary plug vessel side of the secondary plug and existing panel side, and a LAN connector for connecting to a PC via a LAN cable, failure or deterioration shaped blocking function of the vacuum circuit breaker Monitoring device of a vacuum circuit breaker for distant monitoring is configured.
[Brief description of the drawings]

The signal time chart which shows operation | movement of this invention Example. The circuit diagram. The right view of a plug box. The top view of a plug box. The left view of a plug box. The block diagram which shows this invention Example. The structure figure which shows the inside of a vacuum circuit breaker. The external view of the state which opened the switchboard door and looked at the inside of the vacuum circuit breaker inside.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Distribution board, 2 ... Vacuum circuit breaker, 3 ... Secondary monitoring plug (connector for control circuit plug), 7 ... Auxiliary switch, 10 ... Plug box, 13 ... LAN connector, 41 ... Personal computer (P / C), 42 ... operation command signal, 43 ... opening / closing time signal, 44 ... storage means, 45 ... display panel, 46 ... communication means.

Claims (1)

The switchboard installing a vacuum circuit breaker, a vacuum circuit breaker "ON" or "OFF" and the operation command detecting means for detecting an operation command signal generated at the time of operation, the auxiliary switch contacts opening and closing times of the vacuum circuit breaker An opening / closing time detecting means for detecting a signal, a storage means for storing operation state data set in advance for the vacuum circuit breaker, and the operation command detection signal and the opening / closing time detection signal from the time when the operation command signal is generated. Control for calculating the operation time until “ON” or “OFF” of the vacuum circuit breaker and comparing the calculation processing result with the operation state data stored in the storage means to monitor the abnormality of the vacuum circuit breaker In a vacuum circuit breaker monitoring device comprising a monitoring means and a display means for displaying a monitoring result, a secondary monitoring plug for remote monitoring is installed in the switchboard, and the secondary monitoring plug is a vacuum interrupter Power signal detection power transistor for detecting the input of the turn-on command signal and power transistor for detecting the turn-off signal for detecting the input of the shut-off command signal for the vacuum circuit breaker, and the on / off state same as the on / off of the vacuum circuit breaker. And two auxiliary switch contacts that are turned off and on opposite to each other, a power transistor that detects an on / off signal of one of the auxiliary switch contacts, and an on / off signal of the other auxiliary switch contact Power transistor, a secondary plug on the latest vacuum circuit breaker side and a secondary plug on the existing panel side, and a LAN connector connected to a personal computer via a LAN cable, and the vacuum circuit breaker breaking function A vacuum circuit breaker monitoring device that remotely monitors faults and deterioration of the device.

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