JPH06339225A - Power distribution system with self-diagnostic function - Google Patents

Abstract

PURPOSE:To provide a power distribution system with a self-diagnostic function for storing data on with time and managing it at a uniform level. CONSTITUTION:A composite sensor 1 having diagnosing means 4 for diagnosing a state by detecting a plurality of elements for detecting a state of a wiring system, recording means for recording detected diagnosing information and transmitting means 6 for transmitting the information by superposing on a distribution line is provided on each wiring system. Detected diagnosis information of the sensor 1 is managed by a central monitor 11. Thus, not only malfunction diagnosing process combined at respective loads but also a state before falling in an abnormal state can be managed at a uniform level by storing data on with time, and prevention and conservation of an accident of the line can be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution system with a self-diagnosis function for diagnosing the condition of each system of a distribution line and performing centralized monitoring in a central monitoring device.

[0002]

2. Description of the Related Art Conventionally, in a power system protection system, various protection relays for detecting an overcurrent, a short-circuit current, a ground fault current, an unbalanced current, an overvoltage, etc. are appropriately connected to the system to cause a serious failure of various systems. , Judgment of minor malfunctions, alarms and system accidents are shut down.

Similarly, in a power distribution system of a large-scale building, a protection relay is connected to a power distribution line to prevent overcurrent, ground fault current,
It detects non-parallel current, low voltage, insulation failure, etc., and issues alarms and cuts off distribution line accidents according to the detected details.

[0004]

However, in the conventional power distribution system, there is a single function such that the detected value is compared with a predetermined value (reference value) and an accident is cut off depending on the magnitude of the detected value. No judgment has been made under the circumstances. Moreover, unless a device for measuring and recording voltage, current, etc. is specially provided, the process leading up to the accident interruption and the relationship between each wiring are unknown, and the measurement recording, analysis, and evaluation are performed by the administrator. Even when an accident occurs, it is often the case that ad hoc management is carried out, in which pursuit of the true cause cannot be foreseen and accidents cannot be predicted or prevented.

In particular, in recent years, O
A-classification is highly developed, and in a building, a huge amount of important information is handled and accumulated daily by making full use of computer systems. Such information may be destroyed or deteriorated if the power supply line is unstable or contains harmonic noise, but in the conventional power distribution system as described above, it has a single function. Can not deal with the problem of.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a power distribution system with a self-diagnosis function that can accumulate data over time and manage it at a uniform level. Is.

[0007]

To this end, the present invention is a power distribution system with a self-diagnosis function for diagnosing the status of each system of a distribution line and performing centralized monitoring in a central monitoring device, and detecting the status of a wiring system. Each of the wirings is provided with a composite sensor including a diagnostic means for detecting a plurality of elements for performing a state diagnosis, a recording means for recording the detected diagnostic information, and a transmitting means for transmitting the detected diagnostic information by superimposing it on a distribution line. It is characterized in that it is provided in a system and the detection and diagnosis information of the composite sensor is managed by a central monitoring device.

[0008]

In the power distribution system with the self-diagnosis function of the present invention, a diagnostic means for detecting a plurality of elements for detecting the state of the wiring system to diagnose the state, a recording means for recording the detected diagnostic information, and the detected diagnostic information. Is provided in each wiring system, and the central monitoring device manages the detected diagnostic information of the combined sensor, so that the abnormality diagnosis processing combined for each load is performed. Not only that, but also for the state before falling into an abnormal state, data can be accumulated over time and managed at a uniform level, and preventive maintenance of distribution line accidents can be achieved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing one embodiment of a power distribution system with a self-diagnosis function according to the present invention, in which 1 is a composite sensor, 2 is a voltage component detection unit, 3 is a current component detection unit, 4 is a diagnosis unit, and 5 is a recording unit. Reference numeral 6 is a transmitter, 7 and 13 are circuit breakers, 8 is a voltage transformer, 9 is a current transformer, 10 and 14 are high frequency transformers, 11 is a central monitoring device, and 12 is a three-phase transformer for power reception.

In FIG. 1, the composite sensor 1 is not a single-function device such as a conventional protection relay, but detects a plurality of components such as a current component and a voltage component, determines and records an abnormal value, and further It sends them to the central monitoring device. The voltage component detector 2 includes a voltage transformer (PT) 8
The voltage component of each phase of the power distribution line is detected via the input line, and the determination components such as high-voltage noise, open phase, harmonic noise, and overvoltage are taken in. The current component detection unit 3 uses a current transformer (CT).
Each phase current of the power distribution line is detected via 9 and the determination components such as short-circuit current, overcurrent, ground fault current, and phase unbalanced current are fetched. The diagnosis unit 4 diagnoses each output of the voltage component detection unit 2 and the current component detection unit 3, and each output exceeds, for example, a certain set value indicating an initial state or an abnormal state or an initial sign before becoming abnormal. Whether or not there is a sudden change is diagnosed, the result is output to the recording unit 5 and the transmitting unit 6, and the circuit breaker 7 is tripped in the case of a serious failure determination. The recording unit 5 accumulates and records the diagnosis result by the diagnosis unit 4, and the transmission unit 6 transmits the diagnosis result by the diagnosis unit 4 and the information accumulated and recorded in the recording unit 5 from a power distribution line through a high frequency transformer 10 by a high frequency signal. Central monitoring device 11
Is to be sent to. The central monitoring device 11 periodically takes in information of the composite sensor connected to each power distribution line through the high frequency transformer 14 provided on the power receiving end side, and centrally monitors the whole.

FIG. 2 is a diagram showing another embodiment of the power distribution system with a self-diagnosis function according to the present invention, in which 21 is a composite sensor, 22 is a frequency detecting section, 23 is a state detecting section, 24 is a diagnosing section, and 25. Is a recording unit, 26 is a transmission unit, 27 is an electromagnetic switch,
28 is an opening / closing drive unit, 29 is a cable condition selector, and 30 is a high frequency transformer.

The example shown in FIG. 2 shows a composite sensor 21 that detects excessive use, insulation failure, and loose cable connection. The frequency detection unit 22 detects the frequency of use by extracting and counting open / close signals from the open / close drive unit 28 of the electromagnetic switch 27, and the state detection unit 23 uses the cable state selector 29 to detect the use frequency of the cable, for example. The temperature rise is measured to detect the cable connection state or the cable insulation state. Therefore, the diagnosis unit 24 diagnoses the excessive use frequency by the number of times the electromagnetic switch is opened and closed, and the looseness of the cable connection by the degree of temperature rise. It should be noted that, in detecting the frequency of use, instead of the number of times the electromagnetic switch is opened and closed, the voltage may be detected, or the current and temperature may be integrated, and in the detection of loose connection, the temperature may be corrected by the current. Good.

FIGS. 3 to 5 are views showing a concrete example of the configuration of the diagnosis section, in which 31, 41 and 51 are component detection sections, 32 and
Reference numerals 43 and 52 are comparison sections, 33, 44, 54 and 55 are set values, 42 is a fluctuation detection section, and 53 is a fluctuation detection / comparison section.

In the example shown in FIG. 3, the component detecting section 31 detects a current, a voltage, etc., and the comparing section 32 compares the value with a set value 33. In this case, the set value 33 is a value depending on whether the abnormal state is diagnosed or the initial sign before the abnormality is diagnosed by comparing with the output of the component detection unit 31.
For example, it is set in a dip switch, a register, a memory or the like. The example shown in FIG. 4 is configured such that the variation amount is obtained by differentiating or integrating the output of the component detecting unit 41 by the variation detecting unit 42, and the output is compared with the set value 44. And the example shown in FIG.
The output of the component detection unit 51 is compared with a set value 54, and the comparison output, that is, the variation amount of information that exceeds the set value is obtained by the variation detection / comparison unit 53 and set as the set value 55. It is for comparison. Comparison unit 32, 4
3, 52, in the comparison processing by the fluctuation detection / comparison unit 53,
Depending on the comparison with the set value, "1" or "0" is output depending on whether the value exceeds the set value or is smaller than the set value, or the difference from the set value is obtained and output.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, the composite sensor that combines the detection of the voltage component and the detection of the current component, the composite sensor that detects the excessive use frequency, the insulation failure, and the loose cable connection is shown. It goes without saying that any combination of these may be adopted depending on the situation. Further, the composite sensor may have a built-in clock to add the time to the recorded information. Further, although the accidental interruption of the circuit breaker is directly performed by the combined sensor, it may be configured so as to be performed through the central monitoring device.

[0016]

As is apparent from the above description, according to the present invention, a composite sensor is used to detect a plurality of elements for detecting the state of the wiring system, and the state is diagnosed. Since the information is recorded and the detected diagnostic information is superimposed on the distribution line and transmitted, it is possible to eliminate simple measurement recording, analysis, and evaluation by the administrator, and it is possible to manage the wiring system at a certain level in the center. Moreover, not only the combined diagnostic process of abnormality for each load but also the information about the state before the abnormal state can be accumulated, and the preventive maintenance of the accident of the power distribution system can be achieved. Therefore, the reliability of the power distribution system can be improved. Furthermore, since a signal is superposed on the distribution line from the composite sensor and sent to the central monitoring device, a dedicated signal line is not required, and the system can be simplified.

[Brief description of drawings]

FIG. 1 is a diagram showing one embodiment of a power distribution system with a self-diagnosis function according to the present invention.

FIG. 2 is a diagram showing another embodiment of the power distribution system with a self-diagnosis function according to the present invention.

FIG. 3 is a diagram illustrating a specific configuration example of a diagnosis unit.

FIG. 4 is a diagram illustrating a specific configuration example of a diagnosis unit.

FIG. 5 is a diagram illustrating a specific configuration example of a diagnosis unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Composite sensor, 2 ... Voltage component detection part, 3 ... Current component detection part, 4 ... Diagnostic part, 5 ... Recording part, 6 ... Transmission part, 7, 13
... Circuit breaker, 8 ... Voltage transformer, 9 ... Current transformer, 1
0, 14 ... High frequency transformer, 11 ... Central monitoring device, 12
… Power receiving three-phase transformer

Claims (1)

[Claims] 1. A power distribution system with a self-diagnosis function for diagnosing the status of each system of a distribution line and performing centralized monitoring in a central monitoring device, wherein a plurality of elements for detecting the status of a wiring system are detected. Provided in each wiring system is a composite sensor having a diagnostic means for diagnosing the state, a recording means for recording the detected diagnostic information, and a transmitting means for superimposing and transmitting the detected diagnostic information on a distribution line. A power distribution system with a self-diagnosis function, characterized in that information is managed by a central monitoring device.