JP6537849B2 - Failure detection system for rack feeders - Google Patents

Description

  In the present invention, when power is supplied from a power supply line disposed at the top of a rack row to a rack row in which a plurality of racks storing electronic devices such as servers are arranged, connection failure of a feeder line branched for each rack Relates to a connection failure detection device for a rack feeder that detects

In a data center with many rows of racks containing servers, the floor is doubled to form a free access floor, to accommodate communication lines and power cables, and to cool individual rows of racks. The form utilized as a cooling duct is widely adopted.
However, as the calorific value of communication equipment increases, the free access floor is mainly used as a cooling duct for cooling individual rack rows, and the power lines with heat generation are disposed on the ceiling or rack to A configuration has been proposed in which power is supplied to the server from above to improve the cooling efficiency (see, for example, Patent Document 1).

JP, 2012-104008, A

In the configuration in which the power supply line is disposed above the rack, the area where the free access floor can be used as a cooling duct can be expanded, and efficient cooling can be achieved, which is expected to be popular in the future.
However, in the configuration where the power supply line is disposed at the upper part of the rack row and the power supply line is branched for feeding each rack, all the connection parts of the branched feeders become the rack upper part, and the feeder line is usually branched. There are many connection points because a breaker is installed. For this reason, loose connections due to loose screws or earthquakes may occur, and it is not easy to manage so as not to cause poor connections or the like.

  Therefore, the present invention has been made in view of such problems, and when a connection failure occurs in a feeder line branched from a power supply line disposed in a rack row according to a rack row, a rack feeder line for detecting the same. It is an object of the present invention to provide a connection failure detection device for

In order to solve the above problems, the invention according to claim 1 relates to a main power supply line for supplying power to the electronic devices in each rack on the upper portion of the rack row in which racks accommodating electronic devices are arranged in a row. Is a rack feeder connection failure detection device for detecting a feeder connection failure when the feeders branched from the main power supply line are drawn into the individual racks, the feeder being a branch breaker along the way There become disposed, consolidated portion of the main power supply line at the feed line, or the either of the connecting portions of the feed line in the main power line, generated between the secondary side of the power supply line of the branch breakers A connection monitoring circuit that detects a voltage abnormality and outputs an abnormality occurrence signal when the detected voltage value exceeds a predetermined value, an open operation detection circuit that detects an open operation of the branch breaker, and a detection operation of the open operation detection circuit. To stop the operation of the connection monitoring circuit. A stop circuit, connection monitoring circuit outputs an abnormal signal, and if the opening operation detecting circuit does not detect the opening operation of the branch breakers, possess a determination circuit for outputting a connection failure signal, opening operation detecting circuit Is characterized in that the connection monitoring circuit installed at each of the poles constituting the feed line determines that the branch breaker has opened when the abnormality detecting operation is simultaneously performed for a fixed time .
According to this configuration, it is possible to detect a connection failure in the range from the main power supply line or near the main power supply line to the secondary side of the branch breaker from a change in voltage, so generation occurs in the feeder line branched from the main power supply line. The connection failure can be reliably detected without periodically inspecting the connection failure. And, even if the feeder breaker is provided with the branch breaker, no erroneous operation occurs in which the opening operation of the branch breaker is determined as the connection failure. However, it is possible to detect a connection failure of a feed line having a plurality of connection points by providing a branch breaker with one connection failure detection device, which can be implemented at low cost.

In addition, the open operation detection circuit does not need a dedicated circuit for detecting the open operation of the branch breaker, because it determines the open operation and the shut off operation of the branch breaker from the information of the connection monitoring circuit.

  According to the present invention, since a connection failure in a range from near the main power supply line or the main power supply line to the secondary side of the branch breaker can be detected from a change in voltage, it occurs in the feeder line branched from the main power supply line. The connection failure can be reliably detected without periodically inspecting the connection failure. And, even if the feeder breaker is provided with the branch breaker, no erroneous operation occurs in which the opening operation of the branch breaker is determined as the connection failure. However, it is possible to detect a connection failure of a feed line having a plurality of connection points by providing a branch breaker with one connection failure detection device, which can be implemented at low cost.

It is a schematic block diagram of the rack electric power feeding system which provided the connection failure detection apparatus which concerns on this invention. It is a circuit diagram of a connection failure detection circuit. It is an external appearance explanatory view of the rack row which has arranged the main power supply line in the upper part. It is explanatory drawing of a main power wire and a branch box, (a) is a perspective view, (b) is a side view. It is explanatory drawing of a 1st connection point, (a) is internal explanatory drawing which removed the cover of a branch box, (b) is A part enlarged view.

Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a rack power feeding system provided with a connection failure detection apparatus according to the present invention, wherein 1 is a distribution board, 2 is a rack, 3 is a main power supply line, and 4 is a power supply line branched from the main power supply line 3 Reference numeral 5 denotes a connection failure detection device, 6 denotes a branch breaker, and 7 denotes an outlet bar provided in a rack and provided with a plurality of outlets.
The main power supply line 3 is disposed from the distribution board 1 and extends along the rack row on the top plate of the rack 2. Here, a configuration is shown in which two feed lines 4 are branched from the main power supply line 3 and introduced into the rack 2 with respect to one rack 2.

  FIG. 2 shows an example of the circuit of the connection failure detection device 5, and shows a case where the feed line 4 is composed of two electric paths of a voltage phase L1 and a neutral phase N. Two sensor circuits 51 (L1 pole sensor circuit 51a, N pole sensor circuit 51b) for detecting a connection abnormality of the feed line 4, an open operation detection circuit 52 for detecting an open operation of the branch breaker 6, and an input of the sensor circuit 51 The operation stop circuit 53 for opening the contact B provided in the circuit, the determination circuit 54 for determining connection failure from the output of the sensor circuit 51, the notification circuit 55 for notifying occurrence of connection failure, and reset for resetting the notification operation of the notification circuit 55 A circuit 56, a power supply circuit 57 and the like are provided.

  The sensor circuit 51 is provided for the L1 pole and the N pole of the feeder 4, and a section M from the first connection point S1 to the second connection point S2 is a monitoring section of the sensor circuit 51. The first connection point S1 is provided in the vicinity of the connection portion of the feed line 4 with the main power supply line 3, and the second connection point S2 is provided on the feed line 4 on the secondary side of the branch breaker 6. The power supply circuit 57 is connected to the first connection point S1.

  The branch breaker 6 is disposed in the monitoring section, and if there is a connection failure including the connection parts 6a and 6b with the branch breaker 6, it is detected. Specifically, when a potential difference (voltage abnormality) exceeding a predetermined value occurs between the first connection point S1 and the second connection point S2, the sensor circuit 51 detects it and outputs an abnormality occurrence signal.

  The open operation detection circuit 52 receives the outputs of all (here, two) sensor circuits 51 by the AND circuit 52a, and determines that the branch breaker 6 has opened operation when both sensor circuits 51 simultaneously output an abnormality occurrence signal. Output an open operation signal. Strictly speaking, when both sensor circuits 51 output an abnormality occurrence signal simultaneously and for a fixed time (a half cycle or more), it is determined that the open operation is performed.

  The operation stop circuit 53 has a relay 53a and an LED 53b for opening the contact B, receives the output signal of the open operation detection circuit 52, operates the relay 53a, turns on the LED 53b and opens the branch breaker 6 Luminescent display. The contact point B is disposed at the input portion of the sensor circuit 51. When the contact point B is opened in response to the operation of the relay 53a, the input of the sensor circuit 51 is cut off.

The determination circuit 54 includes a stabilization circuit 54a, an AND circuit 54b, a one-shot circuit 54c and the like, and the determination is performed by the AND circuit 54b, and at least one of the two sensor circuits 51 outputs an abnormality occurrence signal, If the output of the open operation detection circuit 52 is in the OFF state, it is determined that connection failure has occurred, and a connection failure occurrence signal is output. The one-shot circuit 54c outputs a signal of a fixed time.
The stabilization circuit 54a includes an average value circuit 11 that averages the output signal of the sensor circuit 51, and a determination circuit 12 that outputs a signal when the output of the average value circuit 11 exceeds a predetermined value. .

  The notification circuit 55 has an LED 55a, and receives the output of the determination circuit 54 to light the LED 55a. Incidentally, an output terminal may be separately provided to notify the occurrence of a connection failure to the outside according to the lighting of the LED 55a.

 The reset circuit 56 has a one-shot circuit 56a that receives the output of the open operation detection circuit 52 and outputs a signal, and resets the notification circuit 55 when the branch breaker 6 is opened while the notification circuit 55 is in operation. Turn off.

The determination operation of the connection state of the feed line 4 in which the connection failure detection device 5 configured as described above is installed is as follows. First, when a connection failure occurs at the power supply side connection portion 6a of the branch breaker 6, for example, the power supply side connection portion 6a of L1 pole, the L1 pole sensor circuit 51a outputs an abnormality occurrence signal. At this time, the N pole sensor circuit 51b does not output an abnormality occurrence signal, so the determination circuit 54 outputs a connection failure occurrence signal. Thus, the notification circuit 55 performs the notification operation, and the LED 55a is turned on to display and notify of the occurrence of an abnormality.
The same applies to the case where a connection failure occurs at the load side connection portion 6b of the L1 pole, and the L1 pole sensor circuit 51a detects the occurrence of an abnormality.

  On the other hand, when a connection failure occurs in the power supply side connection 6a or the load side connection 6b on the N pole side, the N pole sensor circuit 51b outputs an abnormality occurrence signal. As a result, the LED 55a is turned on to notify the occurrence of an abnormality.

  When the branch breaker 6 is shut off or turned off, both the L1 pole sensor circuit 51a and the N pole sensor circuit 51b simultaneously output an abnormality occurrence signal, so that this signal is output for a predetermined time. The received open operation detection circuit 52 outputs an open operation signal. As a result, the operation stop circuit 53 operates to cut off the input of the sensor circuit 51, and the operation of the sensor circuit 51 is stopped. Therefore, the connection failure occurrence signal is not output.

FIG. 3 is an external view showing the main power supply line 3 disposed on the rack 2. As shown in FIG. 3, a frame member 15 for fixing the main power supply line 3 is disposed on the top plate 2a of each rack 2 arranged in a row, and a main formed of a copper bar via the frame member 15 Ducts 9 accommodating power supply lines 3 are installed parallel to the row of racks 2.
The duct 9 is provided with openings 9a on the side surfaces at predetermined intervals, and the branch box 16 in which the branch breaker 6 and the connection failure detection device 5 are accommodated is connected through the openings 9a. The feeder 4 is pulled out and introduced into the rack. Note that FIG. 3 shows a configuration in which a backup circuit is provided on the main power supply line 3 to provide two circuits.

  FIG. 4 is an explanatory view showing the connection of the main power supply line 3 and the branch box 16, (a) is a perspective view, and (b) is a side view. As shown in FIG. 4B, the branch box 16 has a branch function, and a connecting member 16a for holding and connecting each copper bar of the main power supply line 3 in the duct 9 is provided in a protruding manner at the back. By inserting the connecting member 16 a from the opening 9 a of the duct 9, the connecting member 16 a is connected to the main power supply line 3, and the power supply side terminal (primary side terminal) of the branch breaker 6 is connected to the main power supply line 3.

5A and 5B are explanatory views of the first connection point S1 of the connection failure detection device, in which FIG. 5A is an internal explanatory view in which the cover of the branch box 16 is removed, and FIG. As shown in the enlarged view of FIG. 5 (b), the electric wire Q for transmitting voltage information to the sensor circuit 51 is joined by a tooth and a tooth rest (not shown) in the vicinity of the connection portion of the feeder 4 with the main power supply line 3. Thus, a first connection point S1 is formed.
Here, the main power supply line 3 is illustrated as a total of four lines of single-phase three-wire electric paths and spare electric paths. Moreover, the feeder 4 branched from the main power supply line 3 has shown the state comprised by three similarly. In this case, three sensor circuits 51 of the connection failure detection device 5 are provided.

As described above, since it is possible to detect a connection failure in a range on the secondary side of the branch breaker 6 from a portion close to the main power supply line 3 of the power supply line 4, the connection generated in the feed line 4 branched from the main power supply line 3 The connection failure can be reliably detected without inspecting the failure periodically. And even if the branch breaker 6 is provided in the feed wire 4, the malfunction which determines open operation of the branch breaker 6 as connection failure does not generate | occur | produce. However, it is possible to detect a connection failure of the feed line 4 having a plurality of connection points by providing the branch breaker 6 with one connection failure detection device, which can be implemented at low cost.
Further, since the open operation detection circuit 52 determines the open operation and the shut off operation of the branch breaker 6 from the information of the sensor circuit 51, a dedicated circuit for detecting the open operation of the branch breaker 6 is not necessary.

  In the above embodiment, although the first connection point S1 provided on the upstream side to monitor the occurrence of connection failure is in the vicinity of the connection portion of the feed line 4 with the main power supply line 3, the first connection point S1 is the main It is good also as the main power supply line 3 side of the connection part of the power supply line 3 and the feed line 4, and in that case, the connection failure of the connection part also including the connection part of the feed line 4 and the main power supply line 3 can be monitored.

  1 · · Distribution board · 2 · · Rack · 3 · · Main power supply line · 4 · · Feeding line · 5 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · (Connection monitoring circuit) 52: Open operation detection circuit 53: Operation stop circuit 54: Determination circuit 55: Notification circuit

Claims (1)

A main power supply line for supplying power to the electronic devices in each of the racks is disposed on the top of a rack row in which racks containing electronic devices are arranged, and the main power supply lines are provided to the individual racks And a rack feed line connection failure detection device for detecting a connection failure of the feed line when drawing a feed line branched from the
The feeder comprises a branch breaker disposed in the middle,
Consolidated portion of said main power supply line in said feed line, or generated between the either one of the connecting portion between the feeding line in the main power line, and the feed line of the secondary side of the branch breakers A connection monitoring circuit that detects a voltage abnormality and outputs an abnormality occurrence signal when the detected voltage value exceeds a predetermined value;
An open operation detection circuit that detects an open operation of the branch breaker;
An operation stop circuit for stopping the operation of the connection monitoring circuit in response to the detection operation of the open operation detection circuit;
It said connection monitoring circuit outputs an abnormal signal, and if the open operation detecting circuit detects the opening operation of the branch breakers, possess a determination circuit for outputting a connection failure signal,
The rack feed system characterized in that the open operation detection circuit determines that the branch breaker has opened when the connection monitoring circuit installed at each pole of the feed line simultaneously detects an abnormality for a predetermined time. Wire connection failure detection device.

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