JP2000055961A - Wireless phase rotation indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for the loading of a distribution line and the halting of a protective relay, etc., at the time of constituting a testing system, to improve reliability, and to achieve light weight and compact size by detecting a voltage waveform signal from a voltage transformer, converting it into a reference phase signal, performing comparison computation processing on a phase signal of each phase of a voltage system and the reference phase signal at a computing part, detecting and displaying the phase difference of each phase. SOLUTION: Transmission signals from phase rotation indicators 2a, 2b, and 2c are combined with the frequency of a carrier signal by the tuning circuit 29 of a receiving device 3 and are received by a detecting circuit 30 via antennas 27a, 27b, 27c. The received signal is demodulated into a reception phase signal at a demodulating circuit 32. The phase signals are transmitted to a phase rotation indicator 6 via a phase signal transmitting circuit 33 and a twisted cable 4. The signals are inputted to a phase difference detecting circuit 38 via a phase regulating circuit 37. On the other hand, a reference phase signal is detected from a VT 5 by a reference signal detecting circuit 36 and is inputted to the detecting circuit 38. The reception phase signal is compared with the reference phase signal to detect the time delay of phase differences with respect to the falling edge. A reference clock 39 for detecting phase differences is allotted to the time delay of phase differences, and its clock number is detected at a phase difference counting circuit 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless phase detector for detecting that there is no error in the phase sequence of a newly installed voltage system with that of an existing voltage system.

[0002]

2. Description of the Related Art Conventionally, when a high-voltage system is newly added, expanded or replaced in a transmission and substation facility, a phase detection test is performed to confirm that there is no error in the phase sequence of the main circuit of the newly installed high-voltage system. . As shown in FIG. 7A, an explanatory diagram for explaining the phase detection test, the 77 kV bus 101, 1 Trb
5. A high voltage system 1L consisting of 102 and 6.6 kV bus 103 and 77 kV bus 104, 2TrB 105 and 6.
A high voltage system 2L including a 6 kV bus 106 is connected via a protection relay 107, and a 77 kV bus VT (vol.
stage transformer) 108 is provided on the 1L side, and 6.6 kV bus VTs 109a and 109b are connected to 1L.
L and 2L, respectively, and when the 2L side of these high-voltage systems 1L and 2L is newly added or expanded or replaced, a plurality of distribution line loads are stopped and the 6.6 kV bus VT109a on the 1L side is stopped. And the 6.6 kV bus VT109b on the 2L side, and it is confirmed that there is no error in the phase order of the main circuit of the newly installed high voltage system 2L.

As shown in FIG. 7 (b), a 77 kV bus VT108 'is provided on the high voltage system 2L side of the high voltage system 1L, 2L substantially similar to the high voltage system 1L, 2L. When a 77 kV bus is newly added, expanded or replaced, the protection relay 107 is locked and the 77 kV bus is locked.
kV bus VT108 ′ and 6.6 kV bus VT1 on the 2L side
09b, phase detection is performed, and it is confirmed that there is no error in the phase order of the main circuit of the newly installed high-voltage system 2L. 7 (a) and 7 (b), the mark “x” indicates that the load is stopped.

Japanese Unexamined Patent Publication (Kokai) No. 61-153571 discloses that an AC waveform obtained from a known specific phase of a multi-wire distribution line is converted into a rectangular wave, modulated, transmitted as a transmission signal, and transmitted at another position. Receives and demodulates the transmitted signal to obtain a received rectangular wave, and sets the AC waveform obtained from any phase as the test rectangular wave, compensates for the transmission delay time from modulation to demodulation, There has been proposed a phase detection method that compares the phase with a rectangular wave and detects the phase relationship between a known specific phase and any phase.

[0005]

However, FIG.
In the phase test shown in (a), the 6.6 kV bus VT1
Since the phase detection is performed at 09a and 109b, for example, 77k
Since the phase order differs between V buses 104 and the phase order differs between 2TrBs 105, the 6.6 kV bus VT109b
In the phase detection according to the above, there is a possibility that an error-free result may be obtained in the phase sequence, and there is a danger of causing an accident. Also, as shown in the test system range (indicated by a dotted line), a wide range from 77 kV bus to 6.6 kV bus is required. If load transfer is impossible, there is a problem that the test cannot be performed.

In the phase detection test shown in FIG. 7B, the range of the test system is shown (shown by a dotted line) as follows.
Since the 77 kV bus VT108 'is a device to be tested, it is necessary to lock the protection relay. For this reason, it is necessary to change the setting of the protection relay, and there is a problem that a great deal of labor is required. In addition, a great deal of labor is required for examining the supply reliability in advance and performing operations during the test.

In the phase detection method described in Japanese Patent Application Laid-Open No. 61-153571, the phase relationship between each phase is detected within the same high-voltage system, so that the phase sequence with the adjacent high-voltage system is confirmed. There is a problem that can not be performed. Further, since the detection is performed so that the phase relationship between the known specific phase and any of the phases is compared with each other, there is a problem that a large amount of labor is required for the operation of performing the test.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is not necessary to stop a distribution line load or a protective relay when a test system is configured, and a newly installed high-voltage system is provided. Numerical display of the phase difference between the potential phase in the existing and the potential phase in the existing high-voltage system as a reference,
It is an object of the present invention to provide a highly insulated and lightweight wireless phase detector.

[0009]

Means for Solving the Problems and Action / Effect In order to achieve the above-mentioned object, a wireless phase detector according to the present invention is arranged such that a newly installed voltage system has a phase order of an existing voltage system. And (a) an input section for detecting a voltage waveform signal in the newly installed voltage system, and a zero cross point of the voltage waveform signal detected by the input section. A phase signal detection unit that converts the phase signal into a phase signal having a rectangular waveform of each half-wave as a transition point, and converts the phase signal obtained by the phase signal detection unit into a frequency to generate a transmission signal and wirelessly transmits the transmission signal A transmitting unit; a detecting unit that is detachable from each distribution line of the voltage system; (b) a receiving unit that receives a transmission signal from the transmitting unit of the detecting unit; and a receiving signal that is received by the receiving unit. (C) a reference phase signal detector for detecting a voltage waveform signal from a voltage transformer installed in an existing voltage system and converting the signal into a reference phase signal; An arithmetic unit for comparing and calculating a phase signal input from the demodulation unit of the receiving unit and a reference phase signal input from the reference phase signal detection unit to detect a phase difference; And a display unit for displaying a phase difference.

In the present invention, voltage waveform signals of each phase of the voltage system are input to a phase signal detection unit by an input unit of a detection means mounted on each phase of a voltage system to be newly added or added or replaced. These voltage waveform signals are converted into phase signals that are rectangular waves for each half wave with the zero cross point as a change point. These phase signals are converted into transmission signals by being replaced by high and low frequencies, respectively, and are wirelessly transmitted by the transmission unit to the receiving means. The transmission signal is received by the receiving unit of the receiving unit, demodulated into a phase signal, and input to the arithmetic unit of the phase detecting unit. The phase detection means includes a reference phase signal detection unit that detects a voltage waveform signal from a voltage transformer installed in an existing voltage system and converts the voltage waveform signal into a reference phase signal. Is entered. In this operation unit, the phase signal of each phase of the voltage system and the reference phase signal are compared and processed, and the phase difference of each phase is detected, and the phase difference is displayed on the display unit.

According to the present invention, the phase signal detected by the detecting means attached to each phase of the newly installed high voltage system, the reference phase signal from the voltage transformer installed in the existing voltage system, and Are compared, and the phase test is performed.Therefore, the range of the test system is extremely narrowed, and there is no need to transfer the distribution line load or stop the protection relay when configuring the test system. It is possible to remarkably improve the operation and to reduce the labor required for switching the distribution lines. Further, since the phase difference between the potential phase of each phase in the newly installed voltage system and the reference potential phase in the existing high voltage system is displayed, it is possible to detect the amount of phase shift, Since the phase difference of each phase of the voltage system can be detected at a time based on the reference phase signal, the operation load can be reduced and the power can be saved.

Further, according to the present invention, since the transmission signal transmitted from the detecting means is transmitted by radio, the insulation is good, the ripple accident can be suppressed, and the safety is improved.
Further, since the detecting means is detachable from each distribution line of the voltage system, it can be removed after the phase detection test is completed and used for another high voltage system phase detection test.

[0013]

Next, a specific embodiment of a wireless phase detector according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a wireless phase detector 1 according to one embodiment of the present invention, and FIG. 2 is a schematic diagram illustrating an arrangement state of a plurality of high-voltage systems.

The wireless phase detector 1 of this embodiment is a three-phase distribution line (A-phase, B-phase, and C-phase) of a 2L high-voltage system (hereinafter, referred to as a high-voltage system to be detected) which is newly added or replaced.
Phase), three detection devices (corresponding to the detection means in the present invention) 2 (only one is shown) which are detachably attached to each of the three phases, and receive transmission signals transmitted from the three detection devices 2 respectively. (Corresponding to receiving means in the present invention) 3 and a receiving device 3 connected via a twisted cable 4 and a VT (Voltage Target) provided in the existing high-voltage system 1L.
(transformer) 5 is connected and displays a phase difference between a potential phase in the high-voltage system 2L to be detected and a potential phase in the existing high-voltage system 1L (corresponding to phase detecting means in the present invention). 6 is comprised.

In this embodiment, as shown in FIG. 2, high voltage system 1L comprising 77 kV bus 7, 1 Trb 8 and 6.6 kV bus 9 and 77 kV bus 10, 2 Tr
High voltage system 2 consisting of B11 and 6.6 kV bus 12
L are connected via a protective relay 13, a 77 kV bus VT (hereinafter referred to as VT) 5 is provided on the high voltage system 1L side, and a 6.6 kV bus VT 14a, 14b is provided on the 1L and 2L sides, respectively. A case where a new high-voltage system 2L is newly added, expanded, or replaced in an existing transmission / transformation facility will be described.

FIG. 3 is a circuit diagram of the detecting device 2, the receiving device 3 and the phase detecting device 6, and FIG. 4 is an AC waveform diagram (a1) (a2) (a3) of A-phase, B-phase and C-phase. The waveform diagrams (b1), (b2), and (b3) of the phase signal and the waveform diagrams (c1), (c2), and (c3) of the transmission signal are shown in FIG. 5, and the FM radio wave output waveform diagram (a) and its enlarged diagram (b) are shown in FIG. However, FIG.
Waveform diagrams of B-phase and C-phase received signals (a1) (a2)
(A3), waveform diagrams of received phase signals (b1), (b2), (b)
3) and waveform diagrams (c1), (c2), and (c) of the reference phase signal.
3) is shown respectively.

Detecting devices 2a, 2b, 2 connected to A-phase, B-phase and C-phase of the high-voltage system 2L to be detected, respectively.
c has the same detection circuit, and as shown in FIG. 3, a voltage divider that divides the high voltage by the capacitance 15a, the capacitance 15b, and the floating capacitance 15c. A circuit (corresponding to an input unit in the present invention) 16 has a protection circuit 17 connected to the voltage dividing circuit 16 and an input circuit 18 for converting input impedance to high impedance. The input circuit 18 has an A-phase AC waveform (voltage waveform signal) 1
A phase detection circuit (corresponding to a phase signal detection unit in the present invention) 21 for converting 9 into a rectangular wave (phase signal) 20 having a zero-cross point of the waveform as a change point is connected.

The phase signal 2 is supplied to the phase detection circuit 21.
FM that replaces 0 with both high and low frequencies to generate transmission signal 22
A modulation multiplication circuit 23 is connected, and an output amplification circuit 25 that wirelessly transmits the transmission signal 22 to the reception device 3 via an antenna 24 is connected to the FM modulation multiplication circuit 23. The FM modulation multiplier 23 and the output amplifier 25 correspond to a transmission unit in the present invention.

In the receiving device 3, the A-phase receiving antenna 27a and the B-phase receiving antenna 27 for receiving the respective transmission signals 22 from the detecting devices 2a, 2b, 2c.
b and C-phase receiving antennas 27c are provided, and these receiving antennas 27 (27a, 27b, 27
c) shows a receiving circuit 28 (A-phase receiving circuit 28).
a, B-phase receiving circuit 28b and C-phase receiving circuit 28c) are connected. The receiving circuits 28 include a tuning circuit 29 connected to the antenna 27, a detection circuit (corresponding to a receiving unit in the present invention) 30 connected to the tuning circuit 29 and receiving the transmission signal 22, and the detection circuit 30. Circuit 3
0 (received signal) 22 '
A demodulation circuit (corresponding to a demodulation unit in the present invention) 32 for demodulating the received phase signal 31 and converting the received phase signal 31 to the phase detection device 6 through the twisted cable 4 And a phase signal transmitting circuit 33 that transmits the signal via the. A detection signal reception LED 34 is connected to the phase signal transmission circuit 33, and is turned on when the transmission signal 22 is received from the detection device 2 and the reception phase signal 31 is detected.

The phase detector 6 has an existing high voltage system 1.
A reference signal detection circuit (corresponding to a reference phase signal detection unit in the present invention) 36 for obtaining a reference phase signal 35 from the VT 5 provided in L is provided. Each of the transmitted reception phase signals 31 is connected to a phase difference detection circuit 38 input via a phase adjustment circuit 37. Further, a phase difference detection reference clock 39 is input to the phase difference detection circuit 38.

The phase difference detection circuit 38 detects the phase difference between the reference phase signal 35 obtained by the reference signal detection circuit 36 and the received phase signal. A phase difference counting circuit 40 for counting the number of clocks of the phase difference time Δt detected by the phase difference detection circuit 38 is connected. The phase difference count circuit 40 calculates a phase difference between the A phase, the B phase and the C phase based on the clock number.
PU 41 is connected via I / O converter 42.
Further, the I / O converter 42 has display units 43a, 43b, 4 for numerically displaying the calculation results output from the CPU 41, that is, the respective phase differences of the A phase, the B phase, and the C phase.
3c is connected. The phase difference detection circuit 3
8. The phase difference counting circuit 40 and the CPU 41 correspond to an operation unit in the present invention.

The reference signal detecting circuit 36 is connected to the VT 5 with a measuring transformer 44 for extracting a reference waveform from the VT 5, and to the measuring transformer 44 via a protection circuit 45 and an input circuit 46. Square wave (reference phase signal) with zero cross point of
A reference phase signal detection circuit 47 for converting the signal into a reference phase signal 35 is connected.

In the present embodiment, the detecting device 2 has a battery (not shown) therein, and when the switch 48 is turned on, the detection LED 51 is turned on via the test circuit 49 and the voltage detection circuit 50. It is configured to be. In addition, the receiving device 3 and the phase detecting device 6 include:
A voltage is supplied from the VT 5 via the AC / DC power supply 52, and the operation of each is confirmed.

The wireless phase detector 1 constructed as described above
The high-voltage system 2L is installed, the detection device 2 is attached to each phase in a power failure state, and the reception device 3 is arranged below the detection device 2 and within a range where radio waves from the detection device 2 reach. . Before the phase detection is performed, the operation of each of the detection device 2, the reception device 3, and the phase detection device 6 is confirmed by a battery or a power supply supplied from the reference signal detection circuit 36.

Next, electricity is flowed through the test phase high voltage system 2L on a test basis, and the high voltage applied to the detection device 2a attached to the A phase is divided by the voltage dividing circuit 16 so as to be input to the input circuit 1L.
8 is input. FIG. 4A shows an A-phase AC waveform 19 between the voltage dividing circuit 16 and the input circuit 18 (point A). This AC waveform 19 is input to the phase detection circuit 21 connected to the input circuit 16, and
As shown in the waveform diagram of the output portion (point B) of the phase detection circuit 21 in 1), the AC waveform is replaced with a 0.1 signal for each half wave and converted into a phase signal 20.

Subsequently, the phase signal 20 is input to an FM modulation / multiplication circuit 23, and as shown in FIG. 4 (c1), a waveform diagram of the output section (point C) of the FM modulation / multiplication circuit 23 is provided. Based on the 0.1 signal, the signal is replaced with a high frequency and a low frequency and converted into a transmission signal 22. This transmission signal 22
Is wirelessly transmitted from the antenna 24 to the receiving device 3 via the output amplification circuit 25.

Also, in the detectors 2b and 2c mounted on the B-phase and the C-phase, respectively, the AC waveforms 19b and 19c obtained from the B-phase and the C-phase are used.
As in the case of a, the phase signals 20b and 20c are detected, converted into transmission signals 22b and 22c, and transmitted by radio. 4 (a2) and (a3) show the B-phase and C-phase AC waveforms, and FIGS. 4 (b2) and (b3) show the phase signals 20b and 20b.
FIG. 4 (c2) and FIG. 4 (c3) are waveform diagrams of the transmission signals 22b and 22c.

The transmission signals 22, 22b, 22c output from the detection devices 2a, 2b, 2c are shown in FIG.
As shown in the M radio wave (carrier) output waveform 26, A
Phases, B phases and C phases are placed on carrier signals to which different frequency ranges are assigned, respectively, so as to prevent interference. FIG. 5B shows a state in which the transmission signal is placed on the carrier signal and the frequency changes.

The transmission signals 22, 22b, and 22c transmitted from the detection devices 2a, 2b, and 2c, respectively, are adjusted in carrier signal frequency by a tuning circuit 29 incorporated in the reception device 3, and the antennas 27a,
The signal is received by the detection circuit 30 via 27b and 27c. The received signals 22 ', 22b', 22c '
Are demodulated into reception phase signals 31, 31b and 31c as shown in the waveform diagrams of the output section (point D) of the demodulation circuit 32 in FIGS. 6 (b1), (b2) and (b3). 6 (a1), (a2) and (a3) show the detection devices 2a, 2b,
2c received signals 22 ', 22b', 22c '
FIG.

The reception phase signals 31, 31b, 31c
Are transmitted to the phase detector 6 via the phase signal transmission circuit 33 and the twisted cable 4 respectively. The received phase signal 31 input to the phase detector 6 is
, And is input to the phase difference detection circuit 38. On the other hand, in the phase detector 6, the reference signal detection circuit 36 detects the reference phase signal 35 from the VT installed in the existing high-voltage system 1L, and the reference phase signal 35 is transmitted to the phase difference detection circuit 38. Is entered.

The received phase signals 31, 31b and 31c are compared with the reference phase signal 35 by the phase difference detection circuit 38, and the respective phase difference times Δt are detected based on the fall. At the phase difference time Δt, the reference clock for phase difference detection (1 MHz in this embodiment) 39
And the number of clocks corresponding to the phase difference time Δt is detected by the phase difference counting circuit 40.

The phase difference time Δ between the phases A, B and C
The number of clocks corresponding to t is calculated via the I / O converter 42 as C
This is input to the PU 41, and the CPU 41 calculates the phase difference between the A phase, the B phase, and the C phase corresponding to the number of clocks. These phase differences correspond to the I / O converter 42
Are displayed on the display units 43a, 43b, and 43c, respectively.

In this way, the respective phase differences of the A phase, the B phase and the C phase are detected, and it is confirmed that there is no error in the phase order between the high voltage system 2L to be detected and the existing high voltage system 1L. 2a, 2b, 2c are removed, and the phase detection test ends.

According to this embodiment, the phase signal of each phase of the test phase high voltage 2L and the VT installed in the existing high voltage system
5 and the reference phase signal is compared to perform the phase detection test, so that the test system range (indicated by the dotted line in FIG. 2) is much narrower than in the past, and the reliability of the phase detection result is greatly improved. It works. In addition, since there is no need to transfer the distribution line load or stop the protection relay 13 when configuring the test system, it is not necessary to perform an operation such as switching the distribution line, thereby saving labor.

Further, according to the present embodiment, the phase difference between the potential phase in the high-voltage system to be tested and the reference potential phase in the existing high-voltage system can be numerically displayed. Can also be detected up to how many times it has shifted. Further, since the phase differences of all three-phase distribution lines (A-phase, B-phase, and C-phase) of the phase-to-be-tested high-voltage system can be detected at one time, there is an effect that the burden of operation can be reduced and power can be saved.

According to this embodiment, since the detection device 2 is detachable from the high-voltage system to be detected and lightweight and small, it can be removed after the phase detection test and carried to the next site. Can be. Further, since the transmission signal transmitted from the detection device 2 is wirelessly transmitted, there is an effect that insulation is good, a ripple accident can be suppressed, and safety is good.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a wireless phase detector 1;

FIG. 2 is a schematic diagram illustrating an arrangement state of a plurality of high-voltage systems.

FIG. 3 is a circuit diagram of a detection device, a reception device, and a phase detection device.

FIG. 4 is an A-phase, B-phase, and C-phase AC waveform diagram (a1), (a2), (a3), and a phase signal waveform diagram (b1).
(B2) and (b3) and waveform diagrams of transmission signals (c1) and (c)
2) (c3).

FIG. 5 is an FM radio wave output waveform diagram (a) and an enlarged view (b) thereof.

FIG. 6 is a waveform diagram (a1), (a2), (a3) of a received signal of A phase, B phase, and C phase, waveform diagrams (b1), (b2), (b3) of a received phase signal, and a reference phase. It is a signal waveform diagram (c1) (c2) (c3).

FIGS. 7A and 7B are schematic diagrams of a high-voltage system for explaining a conventional phase detection test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wireless phase detector 2 Detecting device (detecting means) 3 Receiving device (receiving means) 5 VT 6 Phase detecting device (phase detecting means) 16 Voltage divider circuit 17, 45 Protection circuit 18, 46 Input circuit 19 AC waveform 20 Phase signal Reference Signs List 21 phase detection circuit (phase signal detection section) 22 transmission signal 23 FM modulation / multiplication circuit 24 antenna 25 output amplification circuit 27 reception antenna 28 reception circuit 29 tuning circuit 30 detection circuit (reception section) 31 reception phase signal 32 demodulation circuit (demodulation section) 33) phase signal transmission circuit 35 reference phase signal 36 reference signal detection circuit (reference phase signal detection unit) 37 phase adjustment circuit 38 phase difference detection circuit 39 phase difference detection reference clock 40 phase difference count circuit 41 CPU 42 I / O conversion Instrument 43 Display 44 Measurement transformer 47 Reference phase signal detection circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Sega 3-2-2 Nakanoshima, Kita-ku, Osaka City Inside Kansai Electric Power Co., Inc. (72) Inventor Satoru 3-2-2, Nakanoshima, Kita-ku, Osaka Kansai (72) Inventor Hideaki Takenouchi 1-1-60 Miwa-cho, Toyonaka-shi, Osaka

Claims (1)

[Claims] 1. A wireless phase detector for detecting that there is no error in the phase sequence of a newly installed voltage system from that of an existing voltage system. An input section for detecting a voltage waveform signal in the distribution line, a phase signal detection section for converting a zero-cross point of the voltage waveform signal detected by the input section into a change point and converting the phase signal into a rectangular signal having half-waves each, A transmission unit that converts a phase signal obtained by the phase signal detection unit into a frequency to generate a transmission signal and wirelessly transmits the transmission signal, and a detection unit that is detachable from each distribution line of the voltage system; A) a receiving unit for receiving a transmission signal from a transmitting unit of the detecting means;
Receiving means having a demodulating section for demodulating a received signal received by the receiving section and converting it into a phase signal; and (c) detecting a voltage waveform signal from a voltage transformer installed in an existing voltage system and detecting a reference phase. A reference phase signal detection unit for converting the signal into a signal, and an operation for comparing a phase signal input from the demodulation unit of the reception unit with a reference phase signal input from the reference phase signal detection unit to detect a phase difference And a display unit for displaying a phase difference detected by the calculation unit.