JP2016070855A - Device for disconnection detection and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for disconnection detection that detects one-line disconnection in a transmission line for connecting power supplies at both terminals with each other and can surely detect the disconnection without increasing facilities, and provide a method therefor.SOLUTION: A device 10 for disconnection detection detects one-line disconnection in a transmission line 101 in a state where two electric power stations respectively provided with power-generating facilities are connected to both end terminals of a three-phase power line and where power generators 111 and 121 of internal combustion power plants B and C are operating, and the device comprises a processing part 12 that is provided in at least one of the internal combustion power plants B and C and checks power to be transmitted to the opposed internal combustion power plant. The processing part 12 determines that the one-line disconnection occurs in the transmission line 101 on the basis of: a first requirement that a three-phase line voltage value is unchanged; and a second requirement that the power to be transmitted to the opposed internal combustion power plant is changed from a value showing three-phase power to a value showing single-phase power.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a breakage detection device for an electric wire arranged for sending electricity and a method thereof.

  Electric wires include power transmission lines and distribution lines. Electricity from the power plant is sent through the transmission lines, and electricity is supplied to customers through the substations and distribution lines. For example, as shown in FIG. 7, there are an internal combustion power station B and an internal combustion power station C in a power station A charge area, and a three-phase transmission line 101 is connected to both. Usually, since the power generators 111 and 121 of both internal combustion power plants B and C are operating, the internal combustion power plants B and C serve as power sources at both ends.

  In FIG. 7, instrument current transformers (CT) 112 and 122 and instrument transformers (PT) 113 and 123 are shown. The instrument current transformers 112 and 122 convert a large current of the transmission line 101 into a current required for a protective relay (not shown), and the instrument transformers 113 and 123 use the high voltage of the transmission line 101 as a relay. Convert to the required voltage. And the relay for protection of the internal combustion power station B and the internal combustion power station C controls the opening and closing of the circuit breakers 114 and 124 based on these currents and voltages.

  In the case of a single-ended power supply, an open-phase cutoff circuit (a combination of 27 relays and 47 relays) that is standard in distribution substations can be adopted. However, if a disconnection (one line) occurs in the power transmission line 101 in the state of the power supply at both ends, the one-phase disconnection circuit (combination of 27 relays and 47 relays) that is standard in a distribution substation cannot detect a one-wire disconnection. . Moreover, since a power transmission line (22 kV power transmission line) using an insulated wire does not accompany a ground fault even if it is disconnected, a one-line disconnection may not be detected by a ground fault protective relay. The 27 relay is an undervoltage relay, and the 47 relay is an open phase voltage relay.

  Further, as a disconnection accident protection system, a reverse phase current relay system (46 relay) that detects a reverse phase current at the time of disconnection has been put into practical use, but it cannot be adopted because it detects even an imbalance of load current.

  Furthermore, as a method for detecting a one-wire break in the case of a power supply at both ends (see, for example, Patent Document 1), the amount of change in the magnitude of the phase current flowing through the three phases (R, S, T) of the transmission and distribution line and a short circuit -Based on the condition that the ground fault relay is not operating, it may be determined whether a disconnection accident has occurred.

JP 2012-157115 A

However, the method described above, that is, a method for detecting a one-wire breakage in the case of a power supply at both ends based on the amount of change in the magnitude of the phase current and the operation of the relay has the following problems.
a. Since short-circuit protection for 6 kV distribution lines uses two current transformers (CT), when this technology is adopted, it is necessary to add one current transformer.
b. In recent years, the transmission line protection relay device is digital and standardization of equipment specifications has been attempted. To adopt this technology, the transmission line protection relay device will be a special specification and contact points for condition input will be prepared. Necessary (in some cases, it is necessary to develop the software independently).
c. When there is an imbalance in the three-phase current, even if the amount of change in the magnitude of the phase current and the line current is monitored, it is the same as the reverse-phase current monitoring (46 relay), and there is a possibility of unnecessary operation.

  An object of the present invention is to solve the above-mentioned problems, detect one disconnection of a power transmission line connecting both ends of the power supply, detect disconnection reliably without increasing the number of facilities, and the device It is to provide a method.

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that two electric stations each having a power generation facility are connected to both ends of a three-phase electric wire and each power generation facility is in operation. A disconnection detecting device for detecting a one-wire disconnection, comprising: a processing device that is provided in at least one of the two electrical stations and that checks the power transmitted to the opposing electrical plant; Due to the first requirement that the value of the line voltage has not changed, and the second requirement that the power sent to the opposing electrical station has changed from a value representing three-phase power to a value representing single-phase power It is determined that one-wire breakage has occurred in the electric wire.

  In the invention of claim 1, in the state where two electric stations each having a power generation facility are connected to both ends of the three-phase electric wire and each power generation facility is in operation, the disconnection detection device detects a one-wire disconnection of the electric wire. To detect. For this reason, the disconnection detection device represents single-phase power from the first requirement that the value of the three-phase line voltage has not changed and the value of the power sent to the opposite electrical station representing the three-phase power. Based on the second requirement that the value has changed, it is determined that a one-wire break has occurred in the electric wire.

  According to a second aspect of the present invention, in the disconnection detecting device according to the first aspect, in addition to the first requirement and the second requirement, the processing device has changed the phase of the current sent to the other end. According to a third requirement, it is determined that a one-wire disconnection has occurred in the electric wire.

  The invention according to claim 3 is a disconnection detection for detecting a one-wire disconnection of the electric wire in a state where two electric stations each having a power generation facility are connected to both ends of the three-phase electric wire and each power generation facility is operating. A method is provided in which a processing device provided in at least one of the two electric power stations is used to check electric power sent to the opposite electric power stations, and a value of a three-phase line voltage has not changed. According to the requirement and the second requirement that the value of the electric power sent to the opposing electrical station has changed from three-phase power to single-phase power, the processing device determines that a one-wire disconnection has occurred in the electric wire, This is a disconnection detection method characterized by the above.

  According to the first and third aspects of the invention, it is possible to detect a one-wire disconnection of the electric wire in a state where the electric stations provided at both ends of the three-phase electric wire operate the power generation equipment. In addition, according to the present invention, since a one-wire disconnection can be detected at the electric station on the side where the processing apparatus is provided, there is no need for a communication line for transmitting and receiving voltage and current information with the opposing electric station. It is.

  According to the invention of claim 2, in addition to the first requirement and the second requirement, the one-wire breakage is determined by the third requirement that the phase of the three-phase current has changed. It is possible to improve detection accuracy.

It is a block diagram which shows an example of the disconnection detection apparatus by Embodiment 1 of this invention. It is a block diagram which shows an example of a process part. It is a vector diagram which shows the relationship between the voltage and electric current at the time of the power station side at the normal time. It is a vector diagram which shows the relationship between the voltage at the time of a disconnection at the power station side, and an electric current. It is a block diagram for demonstrating the two wattmeter method. It is a figure which shows a mode that 1 line disconnection generate | occur | produced. It is a figure which shows an example of an electric power system in case there exists a both-ends power supply.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
A disconnection detecting device according to the first embodiment is shown in FIG. The disconnection detection device 10 of FIG. 1 is provided on the internal combustion power plant C side. And the disconnection detection apparatus 10 detects the 1-wire disconnection of the power transmission line 101 of a both-ends power supply. For this purpose, the disconnection detection device 10 includes an input interface 11, a processing unit 12, and an output unit 13, and further uses the outputs of the instrument current transformer 122 and the instrument transformer 123. In this embodiment, components that are the same as or the same as those in FIG. 7 described above are denoted by the same reference numerals, and description thereof is omitted.

The input interface 11 receives outputs from the instrument current transformer 122 and the instrument transformer 123. That is, since the generating line of the transmission line 101 and the internal combustion power plants B will flow three-phase alternating current, input interface 11, from the current transformer 122 current I _R is the phase current of the three-phase _AC, and inputs the I _T The voltages E _R , E _S , and E _T that are three-phase AC phase voltages are input from the instrument transformer 123. At this time,
- a vector display of the current _{I R I R}
It expresses like this. In the same way
- a vector display of the current _{I T I T}
- a vector display of voltage _{E R E R}
- a vector display of voltage _{E S E S}
- a vector display of voltage _{E T E T}
It expresses like this.

The input interface 11 converts the currents I _R and _IT and the voltages E _R , E _S , and E _T into digital data that can be handled by the processing unit 12. The input interface 11 then outputs digital data currents I _R and I _T and voltages E _R , E _S and E _T to the processing unit 12.

The processing unit 12 detects disconnection of the power transmission line 101 from the digital data from the input interface 11. For this purpose, the processing unit 12 includes a comparison unit 12A and a generation unit 12B as shown in FIG. The comparison unit 12A includes a phase change signal indicating a phase change, a power change signal indicating a power change, and a line indicating a change in the line voltage from the currents I _R and _IT and the voltages E _R , E _S and E _T. A voltage unchanged signal is generated.

Therefore, the comparing unit 12A calculates the line voltage _{V RS} of the R-phase and S-phase of the three-phase AC and a voltage _{E R} and the voltage _{E S.} Vector display of line-to-line voltage _{V RS} is a · _{V RS.} The comparison unit 12A calculates the line voltage _{V ST} between the S-phase and T-phase of the three-phase AC and a voltage _{E S} and the voltage _{E T.} The vector display of the line voltage V _ST is · V _ST . Further, the comparing unit 12A calculates the line voltage _{V TR} of the T-phase and R-phase of the three-phase AC from the voltage _{E T} and the voltage _{E R.} The vector display of the line voltage _VTR is · _VTR . Then, processing unit 12, from the current _{I R} and a current _{I T} which is input, the calculated line voltage _{V RS,} the line voltage _{V ST} and line voltage _{V TR,} and generates the signals described above .

To produce each signal, comparing unit 12A, and a phase comparator 12A ₁ and the power comparator section 12A ₂ and the voltage comparator 12A _3.

Phase comparator 12A ₁ of the comparator unit 12A, by comparing the phases of the line voltage and current, and by increasing the detection accuracy of the one-wire break at both ends power. That is, when 1 line disconnection occurs, the point where the phase of the current I _R and a current I _T is changed, the phase comparator 12A ₁ is utilized. In this embodiment, the phase comparator 12A ₁ compares the phase difference between the line voltage _{V RS} and the current _{I R.} For example, FIG. 3 shows a vector diagram of line voltage and current at normal time, and FIG. 4 shows a vector diagram of line voltage and current at S phase disconnection. These from two figures Obviously, if both ends power, although the voltage of the phase, such as line voltage V _RS and the line voltage V _ST does not change, the phase of the current I _R and current I _T is large changes To do. For example, if the current _{I R} of the R-phase, during normal, with respect to the line voltage _{V RS,} the current _{I R} phase,
30 ° + θ
However, when the S phase is broken, the phase is 30 ° + 30 ° + θ.
And the phase difference is
(30 ° + 30 ° + θ) − (30 ° + θ) = 30 °
become. Here, if the angle θ is, for example, the S phase, it is the phase difference between the phase voltage E _S and the phase voltage I _S , and the angle 30 ° is the phase difference between the line voltage V _RS and the phase voltage E _S.

Thus, the phase comparator 12A _1, for example examines the phase of the current I _R for line voltage V _RS in real time, if the phase from the calculation result of the above equation is changed 30 ° or more, determines that there is a phase change . Then, in this case, the phase comparator 12A ₁ outputs the phase variation signal of a high level ( "1"). In this embodiment, this phase change is examined in order to improve the detection accuracy of the one-wire disconnection.

Power comparing section 12A ₂ of the comparison unit 12A checks the current _{I R} and the current _{I T,} the line voltage _{V RS,} the three-phase power from the line voltage _{V ST} and line voltage _{V TR.} In this embodiment, the power comparing unit 12A ₂ is using a two wattmeter method.

In the two-watt meter method, as shown in FIG. 5, for example, two watt meters 201 and 202 are installed on the internal combustion power plant C side. Then, the power _{W 1} between the R phase and the S phase was measured power meter 201 by the line voltage _{V RS} and the current _{I R,} T-phase power meter 202 by the line voltage _{V TS} and the current _{I T} and measuring the power W ₂ between the S-phase. Thereafter, the electric power comparison unit 12A ₂ uses the electric power W sent to the internal combustion power plant B,
W = W ₁ + W ₂
Calculated by

の式で算出して、二電力計法による測定を行う。このときの電圧・電流のベクトルを先の図３に示している。そして、電力比較部１２Ａ_２は、内燃力発電所Ｂに送られる電力Ｗを、

の式で算出する。これにより、電力比較部１２Ａ_２は、正常時には、内燃力発電所Ｂに送られる電力として三相電力（√３ＶＩｃｏｓθ）を計測する。なお、これらの式では、

としている。 In this embodiment, the power comparing unit 12A ₂ from the voltage across the line voltage _{V RS} and the line _{V TS} and the current _{I R} and the current _{I T,} and a power _{W 1} and the power _{W 2,}

Measured by the two wattmeter method. The voltage / current vectors at this time are shown in FIG. Then, the power comparing unit 12A ₂ is a power W fed to the internal combustion power stations B,

Calculate with the following formula. Thus, the power comparing unit 12A ₂ Upon successful measures the three-phase power (√3VIcosθ) as power delivered to the internal combustion power plant B. In these equations,

It is said.

の式で算出する。このときの電圧・電流のベクトルを先の図４に示している。そして、電力比較部１２Ａ_２は、内燃力発電所Ｂに送られる電力として電力Ｗを、

の式で算出する。これにより、電力比較部１２Ａ_２は、Ｓ相の１線断線時には、内燃力発電所Ｂに送られる電力として単相電力（ＶＩｃｏｓθ）を計測する。 Incidentally, for example, from when a disconnection in the S phase is generated as shown in FIG. 6, the power comparing unit 12A ₂ is between line voltage _{V RS} and the line voltage _{V TS} and the current _{I R} and the current _{I T,} the power _{W 1} And power W ₂

Calculate with the following formula. The voltage / current vectors at this time are shown in FIG. Then, the power comparing unit 12A ₂ is a power W as power delivered to the internal combustion power stations B,

Calculate with the following formula. Thus, the power comparing unit 12A _2, at the time of 1-wire disconnection of S phase, measures the single-phase power (VIcosθ) as power delivered to the internal combustion power plant B.

That is, at the time of S-phase one-wire disconnection, the power comparison unit 12A ₂
Measure half of single-phase power as power W ₁ Measure half of single-phase power as power W ₂ ,
As a result, the single-phase power (VI cos θ) is measured as the power W for the internal combustion power plant B.

In the same way, at the time of one-wire break in the R phase, the power comparing unit 12A ₂ is
Measure 0 (zero) as power W ₁ Measure single-phase power (VI cos θ) as power W ₂ ,
As a result, the single-phase power (VI cos θ) is measured as the power W for the internal combustion power plant B.

Further, at the time one-wire break in the T-phase, the power comparing unit 12A ₂ is
Since single-phase power is measured as power W ₁ , 0 (zero) is measured as power W ₂ .
As a result, the single-phase power (VI cos θ) is measured as the power W for the internal combustion power plant B.

From these measurement results, when a one-wire disconnection occurs, the value of the electric power W measured in real time changes from √3 VI cos θ to VI cos θ, so there is a change in the electric power W value of, for example, “1-1 / √3” or more. When power comparator section 12A ₂ outputs a power change signal of a high level ( "1").

をリアルタイムで調べる。そして、各電圧値に変化がなければ、電圧比較部１２Ａ_３はハイレベル（「１」）の線間電圧無変化信号を出力する。 Voltage comparator 12A ₃ of the comparator unit 12A, the line voltage _{V RS,} the voltage value of the line voltage _{V ST} and line voltage _{V TR,} that is,

In real time. Then, if there is no change in the voltage value, the voltage comparison section 12A ₃ outputs a line voltage unchanged signal of a high level ( "1").

Upon receiving the phase change signal, the power change signal, and the line voltage unchanged signal from the comparison unit 12A, the generation unit 12B generates a disconnection detection signal from these signals. For this purpose, the generation unit 12B includes AND gates 12B ₁ and 12B ₂ and a timer 12B ₃ . The AND gate 12B ₁ performs a logical product operation of the phase change signal and the power change signal, and the AND gate 12B ₂ performs a logical product operation of the AND gate 12B ₁ operation result and the line voltage unchanged signal. . That is, the AND gate 12B ₁ and the AND gate 12B ₂ have a requirement that the phase change signal, the power change signal, and the line voltage non-change signal become high level, and the phase has changed, and that the power has changed. When the requirement that the line voltage does not change is satisfied, a one-wire disconnection is detected. When the disconnection detection state by the AND gates 12B ₁ and 12B ₂ continues for a preset time, the timer 12B ₃ outputs a disconnection detection signal indicating the detection of the one-wire disconnection to the output unit 13.

  When the output unit 13 receives the disconnection detection signal from the processing unit 12, the output unit 13 outputs a trip signal for tripping the circuit breaker 124 and outputs an alarm signal indicating the occurrence of the one-wire disconnection.

Next, the disconnection detection method by the disconnection detection apparatus 10 of this embodiment will be described. Disconnection detection device is installed in an internal combustion power plant C 10, a current from the current transformer 122 _I R, as input _{I T,} the input voltage _E R from the potential transformer _123, E S, the _{E T} And The input interface 11 of the disconnection detection device 10 converts the currents I _R and _IT and the voltages E _R , E _S , and E _T into digital data that can be handled by the processing unit 12. Thereafter, the input interface 11 outputs digital data currents I _R and I _T and voltages E _R , E _S and E _T to the processing unit 12.

The processing unit 12 calculates line voltages V _RS , V _ST , V _TR from the voltages E _R , E _S , E _{T of} the digital data input from the input interface 11. Then, the processing unit 12, the line voltage _{V RS, V ST, V TR} and the current _I R, detects a line disconnection of the transmission line 101 from the _{I T.} At this time, the processing unit 12 checks the variation of the phase of the current I _R, I _T, if there is a change in phase, to produce a phase change signal of a high level. Further, the processing unit 12 generates a high-level power change signal when the power value W for the internal combustion power plant B has a change of “1-1 / √3” or more from the three-phase power (√3 VI cos θ). To do. Further, when there is no change in the line voltages V _RS , V _ST , V _TR , the processing unit 12 generates a high-level line voltage unchanged signal.

  Thereafter, the processing unit 12 performs a logical operation on the phase change signal, the power change signal, and the line voltage unchanged signal to detect a one-wire disconnection, and when the disconnection detection state continues for a set time, the one-wire A disconnection detection signal indicating detection of disconnection is output to the output unit 13. When the output unit 13 receives the disconnection detection signal, the output unit 13 outputs a trip signal for tripping the circuit breaker 124 and outputs an alarm signal indicating the occurrence of the one-wire disconnection.

As described above, according to this embodiment, a current or voltage from an instrument current transformer or an instrument transformer usually provided in a power plant is used to detect a one-wire disconnection by a two-watt meter method. be able to. As a result, according to this embodiment,
a. Since the disconnection of the power transmission line can be detected, electricity can be stopped before touching the disconnected electric wire, thus preventing an electric shock. B. Since a new current transformer (CT) is not required, the capital investment can be reduced. C. When a distributed power supply is connected to a distribution line, it becomes a power supply at both ends. With this method, disconnection can be detected. D. Communication line is unnecessary because it is not necessary to detect disconnection based on voltage / current information at the location of the distributed power supply (disconnection detection is possible only by own terminal)
e. Since it is not necessary to input conditions from other devices (other protective relay devices), it is possible to achieve the effect that there is no need to modify other devices and there is no need to manufacture special specification products.

(Embodiment 2)
In this embodiment, the processing unit 12 of the first embodiment further performs the following processing. In this embodiment, components that are the same as or the same as those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

In the first embodiment, the power comparing unit 12A ₂ of the processor 12, based on the value of the power W ₁ and the power W ₂ and the power W, or when 1 line disconnection of R-phase,
And the results of measuring the single-phase power as electric power W ₂ for measuring the 0 (zero) as the power W _1. In addition, at the time of the S-phase one-wire disconnection, the power comparison unit 12A ₂
And the results of measuring the half of the single-phase power as electric power W ₂ which measures half the single-phase power as the electric power W _1. Furthermore, at the time of one-phase disconnection of the T phase, the power comparison unit 12A ₂
And the results of measuring the 0 (zero) as the power W ₂ for measuring a single-phase power as the electric power W _1.

That is, the values of the electric power W ₁ and the electric power W ₂ are different depending on the disconnection of the R phase, the S phase, and the T phase. Consequently, by such a measurement result based on the power comparison section 12A ₂ can determine R phase, S phase, T-phase, what phase is broken. Then, the power comparing unit 12A ₂ outputs the determination result to the output unit 13.

  Thereby, the output unit 13 may add information indicating the disconnected phase to the alarm signal indicating occurrence of disconnection.

  As a result, a one-wire break alarm can be issued, and at the same time a broken phase can be notified.

(Embodiment 3)
In the first embodiment, the processing unit 12, the line voltage _{V RS,} the line voltage _{V ST} and line voltage _{V TR,} current _I power from _R and current _{I T} by two wattmeter method _{W 1} and power _{W 2} And calculated. However, if power meters that measure the power W ₁ and the power W ₂ are respectively installed on the internal combustion power plant C side, the processing unit 12 may use the outputs from these power meters.

Thus, it is possible to omit the calculation of the power W ₁ and the power W _2, it is possible to reduce the burden of the processing unit 12.

  As mentioned above, although each embodiment of this invention has been described in detail, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the scope of this invention, It is included in this invention. For example, in each embodiment, the disconnection detection device 10 is provided in the internal combustion power plant C. However, the disconnection detection device 10 can detect disconnection at its own end, and is not limited thereto. You may provide in the power plant B, and you may provide in both internal combustion power plants B and C. Furthermore, you may provide the disconnection detection apparatus 10 in the distribution line of the power substation from which distribution lines, such as 6 kV and 22 kV, are pulled out.

10 Disconnection Detection Device 11 Input Interface 12 Processing Unit (Processing Device)
12A comparison unit 12A ₁ phase comparison unit 12A ₂ power comparison unit 12A ₃ voltage comparison unit 12B generation unit 13 output unit 112 current transformer 113 instrument transformer

In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the two electric stations each having a power generation facility are connected to both ends of a three-phase electric wire, and the three power generation facilities are in operation. a disconnection detecting unit that detects a line disconnection phase wires, said provided at least one of the two electric station, the first phase voltage supplied to the three-phase wires, a second phase voltage and the 3, a phase current due to the first phase voltage, and a phase current due to the third phase voltage are input. The processing device includes the first phase voltage and the second phase voltage. A first line voltage between the first phase voltage, a second line voltage between the second phase voltage and the third phase voltage, a third phase voltage and the first phase voltage. A third line voltage between the first phase voltage and a phase current phase of the first phase voltage, the first line Checking the phase with respect to the voltage, and when the phase changes by a predetermined value or more, the first requirement that there is a phase change, the power calculated from the first line voltage and the phase current due to the first phase voltage, The sum of the power calculated from the second line voltage and the phase current generated by the third phase voltage is calculated, and the sum power is changed from a value representing three-phase power to a value representing single-phase power. a second requirement that was the third requirement that there is no change in the voltage value of the first line voltage and said second line voltage and the third line voltage, by, the three It is determined that one-wire breakage has occurred in the phase wire.
The disconnection detection apparatus characterized by the above-mentioned.

In the first aspect of the invention, the disconnection detection device is connected to both ends of the three-phase electric wire, and the disconnection detecting device is connected to the three-phase electric wire 1 in a state where the respective electric power generation facilities are operating. Wire breakage is detected. For this reason, the disconnection detecting device has a first requirement that a phase change occurs when the phase of the phase current by the first phase voltage and the phase with respect to the first line voltage changes by a predetermined value or more, and The sum of the power calculated from the line voltage of 1 and the phase current of the first phase voltage and the power calculated from the phase current of the second line voltage and the third phase voltage represents the three-phase power. A second requirement that the value has changed to a value representing single-phase power, and a third requirement that there is no change in each voltage value of the first line voltage, the second line voltage, and the third line voltage. It is determined that one wire breakage has occurred in the electric wire according to the requirements .

The invention of claim 2 detects one-wire breakage of the three-phase electric wire in a state where two electric stations each equipped with the electric power generation facility are connected to both ends of the three-phase electric wire and each power generation facility is operating. A disconnection detection method, comprising: a first phase voltage, a second phase voltage, and a third phase supplied to the three-phase wire with respect to a processing device provided in at least one of the two electrical stations. A first line voltage between the first phase voltage and the second phase voltage, with the input of the voltage and the phase current due to the first phase voltage and the phase current due to the third phase voltage. A second line voltage between the second phase voltage and the third phase voltage, and a third line voltage between the third phase voltage and the first phase voltage. Is calculated by the processing device, and the phase of the phase current due to the first phase voltage and the phase with respect to the first line voltage is examined. When the phase changes by a predetermined value or more, the first requirement that there is a phase change, the power calculated from the first line voltage and the phase current due to the first phase voltage, and the second line The second requirement that the sum of the power calculated from the inter-phase voltage and the phase current due to the third phase voltage is calculated, and that the sum power is changed from a value representing three-phase power to a value representing single-phase power When, by the third requirement that there is no change in the voltage value of the first line voltage and said second line voltage and the third line voltage, 1 line disconnection on the three-phase wires The disconnection detection method is characterized in that it is determined by the processing device that the error has occurred.

According to the first and second aspects of the present invention, it is possible to detect a one-wire disconnection of the electric wire in a state where the electric stations provided at both ends of the three-phase electric wire operate the power generation equipment. In addition, according to the present invention, since a one-wire disconnection can be detected at the electric station on the side where the processing apparatus is provided, there is no need for a communication line for transmitting and receiving voltage and current information with the opposing electric station. It is.

Claims (3)

Two electrical stations each equipped with a power generation facility are connected to both ends of a three-phase electric wire, and a disconnection detection device that detects a one-wire disconnection of the electric wire in a state where each power generation facility is operating,
A processing device that is provided in at least one of the two electric stations and that checks the electric power sent to the opposing electric stations;
In the processing apparatus, the first requirement that the value of the three-phase line voltage does not change, and the power sent to the opposing electrical station changes from a value representing three-phase power to a value representing single-phase power. It is determined that one wire breakage has occurred in the electric wire according to the second requirement.
The disconnection detection apparatus characterized by the above-mentioned. The said processing apparatus determines with the 3rd requirement that the phase of the electric current sent to the other end changed in addition to the said 1st requirement and the said 2nd requirement that the 1 wire disconnection generate | occur | produced in the said electric wire. ,
The disconnection detection apparatus according to claim 1. A disconnection detection method in which two electric stations each having a power generation facility are connected to both ends of a three-phase electric wire, and one wire disconnection of the electric wire is detected in a state where each power generation facility is operating,
By using a processing device provided in at least one of the two electrical stations, the power sent to the opposing electrical stations is examined,
According to the first requirement that the value of the three-phase line voltage has not changed, and the second requirement that the value of the power sent to the opposing electrical station has changed from three-phase power to single-phase power, The processing device determines that one wire breakage has occurred in the electric wire,
The disconnection detection method characterized by the above-mentioned.

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