JP2005065424A - Automatic monitoring circuit for protective relay system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an automatic monitoring device for protective relay systems wherein the operating time of a system is increased and the reliability of the system itself without significant addition of hardware. <P>SOLUTION: The automatic monitoring device for protective relay systems comprises: transfer interruption signal receivers 21 and 22 that receive a transfer interruption signal transferred through a predetermined transmitter when an accident is detected (M) in any other protective relay system; contacts 5<SB>2</SB>and 6<SB>2</SB>that are closed when the transfer interruption signal is received; a contact 3<SB>1</SB>that is closed when an accident is detected (FD) in the own system; a circuit breaker trip circuit with which the trip circuit coil 4 of a circuit breaker is connected in series; and auxiliary relays 5 and 6 that are connected with the contact 5<SB>2</SB>and 6<SB>2</SB>and detect that the transfer interruption signal receivers 21 and 22 have received a transfer interruption signal. The monitoring device is also provided with an automatic inspection circuit 206 and continuous monitoring circuits 205 and 207 for the enhancement of the reliability of the system. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an automatic monitoring circuit for a protective relay device, and more particularly to an automatic monitoring circuit provided in a protective relay device for protecting a protection target such as a power system or equipment.

  In power systems such as power transmission lines, various protective relay devices according to the purpose are used in order to ensure safe operation of the system. Protective relay devices used for a wide range of system protection (loads of system stabilization devices or power-restricted terminal devices and subsequent control terminals) are described as protective relay devices (disaster detection) installed for the purpose of detecting accidents. Between other protective relay devices and each protective relay device for performing control selection calculation for accidents from the terminal) to the protective relay device (control terminal) having a circuit breaker trip circuit Since a high-speed operation is required for the operation of the control terminal (from reception of a transfer cutoff signal to output of a cutoff command), a digital type protective relay device via software processing is used. Instead, an analog protective relay was applied.

  However, on the other hand, in recent years, as the super-high voltage of the power system increases and the importance increases, the protective relay device is also required to have higher reliability. Therefore, the conventional digital protective relay device adopts an automatic monitoring system for improving reliability. This automatic monitoring system consists of two parts, continuous monitoring and automatic inspection. The former continuous monitoring is determined to be abnormal when an operation that cannot be normal is continued for a certain period of time, and mainly malfunctions are detected. This is a monitoring method. Further, the latter automatic inspection automatically carries out periodic inspection work of the protective relay device (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-23565

  Since the conventional digital protection relay device is configured as described above, the device operation time from reception of the transfer cut-off signal to output of the cut-off command is delayed by software processing. There is a problem that it cannot be applied to a relay device (control terminal device of a system stabilization device).

  On the other hand, the conventional analog protection relay device (control terminal device of the system stabilization device) can cope with high-speed operation, but generally does not have an output circuit check and automatic inspection circuit for constant monitoring. In order to provide an automatic monitoring circuit for improving the degree of operation, there has been a problem that a large amount of hardware is required.

  The present invention has been made to solve such a problem, and is a protective relay device that improves the reliability of the device itself without increasing the hardware time while increasing the device operation time. The purpose is to obtain an automatic monitoring device.

  The present invention is an automatic monitoring circuit for a protective relay device that trips a circuit breaker in order to protect an object to be protected, and an accident is detected by another protective relay device and transferred via a predetermined transmission device. A transfer cutoff signal receiving means for receiving a transfer cutoff signal; a first relay contact for closing when the transfer cutoff signal receiving means receives the transfer cutoff signal; and the first relay contact; An auxiliary relay for closing the first relay contact by detecting that the transfer cutoff signal receiving means has received the transfer cutoff signal, and a second relay contact for closing by detecting a failure in the device itself; A circuit breaker tripping relay for detecting a fault in the device and closing the second relay contact, and a tripping circuit in which the first relay contact and the second relay contact are simultaneously closed and excited. An automatic monitoring circuit for a protective relay device, characterized in that a high-speed auxiliary relay is used as the auxiliary relay for closing the first relay contact. is there.

  Thus, according to the present invention, since the high-speed auxiliary relay is used for the transfer cut-off signal receiving circuit, the high-speed processing time from the transfer cut-off signal reception to the control command is ensured while the apparatus itself High reliability can be realized.

Embodiment 1 FIG.
Hereinafter, an automatic monitoring circuit for a protective relay device according to Embodiment 1 of the present invention will be described with reference to FIG. The automatic monitoring circuit of the protective relay device according to the present invention pulls the circuit breaker when a system fault is detected by another protective relay device installed at a distance or when a fault in the device is detected. It is for removing and protecting a protection object. In Figure 1, the control power P, N are provided, the circuit breaker trip relay contacts 1 ₁ a trip lock relay 1, breaker tripping command for relay contacts 5 _2, 6 _2, 3 connection ₁ and is in series Has been. In addition, when carrying out periodic inspection work of protective relay devices and inspection work of circuit breakers, it is provided so that it can be removed to prevent unnecessary protective relay operation output during inspection. A test terminal 24 having a short-circuit piece is connected in series with the contact. Further, a circuit breaker tripping coil 4, the contacts 4 ₁ and is provided with the circuit breaker.

As described above, in the present embodiment, in the circuit that gives the trip command to the circuit breaker, the transfer interruption signal transmitted through the transmission device after the accident detection (M) by the protective relay device installed at a distance. a first relay contact 5 _2, 6 ₂ closed by receiving a second relay contact 3 ₁ closed by the failure detection in the self-device (FD), a circuit coil 4 tripping of the breaker is It has a circuit breaker trip circuit connected in series. The circuit breaker tripping command for relay contacts 5 _2, 6 ₂ and 3 ₁ tripping coil 4 to protect the protected by tripping the circuit breaker is energized by closing.

201 is a trip lock output of the trip lock relay 1, 203 and 204 are fault detection (M) outputs (for forced operation) of the circuit breaker tripping relay 2 and fault detection of the circuit breaker tripping relay 3, respectively. (FD) output. The trip lock relay 1, in addition to the contacts _{1 1} described above, the contact ₁ 2, _{1 3} are provided in the transfer trip signal receiving apparatus 21 side. The circuit breaker tripping relay 2 is provided with contacts 2 ₂ and 2 ₃ for an accident detection (M) output 203 (for forced operation). A breaker tripping for relay 3, the contact 3 ₁ is provided that is integrated directly into the circuit breaker trip circuit. Photocoupler 103 is provided in the contact _{1 1,} the photocoupler 105 is provided in the contact _{3 1.}

Further, as shown in FIG. 1, in the present embodiment, a transfer cut-off signal transmitted through a predetermined transmission device after an accident detection (M) is detected by another protective relay device installed far away. Transfer interruption signal receiving means 21 and 22 for receiving are provided. The transfer trip signal receiving apparatus 21, transfer trip 5,6 (auxiliary relay of high-speed operation) the signal receiving relay is connected, directly breaker tripping contacts ₅ 2, _{6 2} of the transfer trip signal receiving relay 5,6 The circuit breaker tripping circuit comprising the coil 4 is incorporated. Thus, a transfer trip signal received transfer trip signal receiving apparatus 21 detects that transfer trip signal receiving relay 5,6, the contact 5 _2, 6 _2, be incorporated directly, the breaker tripping circuit Because it can, high-speed operation is possible. The contact ₅ 2, _{6 2} of the transfer trip signal receiving relay 5 and 6 are photo-coupler 104 is provided.

  Further, an automatic monitoring circuit is provided to improve the reliability of the entire apparatus. The automatic monitoring circuit includes two constant monitoring circuits 205 and 207 that detect a phenomenon that cannot be normal, and an automatic inspection circuit 206 that detects a malfunction or the like that is difficult to detect by constant monitoring.

In the present embodiment, the contact ₅ 1, _{6 1} of the transfer trip signal receiving relay 5,6, reads provided photocouplers 106 and 107, and to allow the contact input circuit checked by constantly monitoring circuit 205. Contact ₁ 2 trip lock relay 1 to transfer trip signal receiving relay 5,6, _{1 3} is provided, disconnect the contacts of the transfer trip signal receiving apparatus 21, contacts fault detection (M) output 203 (for forced operation) 2 ₂ and 2 ₃ are incorporated to enable automatic inspection including the coils and contacts of the transfer interruption signal reception relays 5 and 6.

Next, the operation will be described. In FIG. 1, when an interruption detection signal (M) is detected by another protective relay device installed far away and a transfer cutoff signal transferred via a predetermined transmission device is received by the transfer cutoff signal reception devices 21 and 22. , receives it in transfer trip signal receiving relay 5,6, by closing the auxiliary relay contact 5 _2, 6 ₂ of the circuit breaker trip circuit, a fault detection (FD) circuit breaker tripping for relay 3 by the output 204 There it is determined that the failure detection in and the conditions of the thereby closing the contacts 3 _1, drives the tripping coil 4. At this time, the apparatus operating time from reception of the transfer cut-off signal to output of the cut-off command is only the operation time of the transfer cut-off signal receiving relays 5 and 6, so that high-speed operation is possible.

  Next, the operation of the automatic monitoring circuit will be described.

(1) performs the implementation of constant mark check by state of the contact 5 _1, 6 ₁ taken at 106 and 107 photocoupler as contact input circuit check performed by constantly monitoring circuit 205 continuously monitors transfer trip signal receiving circuit, at all times an output circuit check performed by monitoring circuit 207, the state of the circuit breaker tripping for relay contacts 5 _2, 6 ₂ are implementing malfunction monitoring by incorporating a photo-coupler 104. Similarly, fault detection (FD) 204 also relays contacts 3 ₁ states breaker tripping uptake by the photocoupler 105 is performed a malfunction monitoring. In the contact input circuit check performed by the constant monitoring circuit 205, as shown in FIG. 4, the state of the transfer cutoff signal of the transfer cutoff signal receivers 21 and 22 is captured by the photocouplers 106 and 107, and a fixed mark check is performed. As shown in FIG. 6, the output circuit check performed by the constant monitoring circuit 207 performs a mismatch check between the photocouplers 103, 104, and 105 and the outputs 201 and 203 (or inputs of 107 and 106) and 204.

(2) The automatic inspection of automatic inspection transfer trip signal receiving circuit, a trip lock output 201, by driving the trip lock relay 1, and the contact 1 _2, 1 ₃ and open, transfer trip signal receiving apparatus 21, 22 By disconnecting the circuit breaker and driving the accident detection (M) output (for forced operation) relay 2 from the normal state (non-operational state) by the contacts 2 ₂ and 2 ₃ of the circuit breaker tripping relays 2 and _3. the receiving relay 5,6 forced operation, the auxiliary relay contact 5 _2, 6 ₂ operation of the breaker trip circuit captures the photocoupler 104 connected to them, check the contact operation, performed operation check ing. Similarly, the fault detection (FD) output 204, a circuit breaker trip relay contacts 3 ₁ forced operation, check the contact operation by a photo-coupler 105 connected, has conducted the operation check.

  The process performed by the automatic inspection circuit 206 is as shown in the flowchart of FIG. 5, when automatic inspection is started (step S1), after confirming the operation by the trip lock output 201 (the circuit breaker tripping circuit is locked) (step S2, S2). S3), accident detection (M) 203 (for forced operation) operation / return (steps S4 to S7), failure detection (FD) 204 operation / recovery (steps S8 to S11) are sequentially performed, and final trip lock output The normal inspection is completed when 201 returns (steps S12 and S13). If there is an operation failure or a return failure, it is detected as an inspection failure, causing a device failure, and detecting power at each point is restored (step S14), and the automatic inspection is terminated. If an accident detection (M) 203 or failure detection (FD) 204 system fault is detected during the inspection, each inspection output is immediately restored as an accident response (step S15), and the inspection is stopped.

As described above, according to the present embodiment, since the transfer interruption signal receiving relays 5 and 6 including auxiliary relays that operate at high speed are used in the transfer interruption signal receiving circuit, the apparatus operating time is determined as the transfer interruption signal. Only the operation time of the signal reception relays 5 and 6 enables high-speed operation. Further, reading the state of the contact ₅ 1, _{6 1} is provided a photocoupler 106 and 107, and to allow the contact input circuit checked by constantly monitoring circuit 205. The contact ₁ 2, _{1 3} trip lock relay 1 provided transfer trip signal receiving relay 5,6, disconnect the transfer trip signal receiving apparatus 21, fault detection (M) contacts ₂ 2 for forced operation of the output 203, 2 and ₃ were incorporated to enable automatic inspection including the coils and contacts of the transfer interruption signal receiving relays 5 and 6. Thus, by providing a high-speed operation auxiliary relay and an automatic monitoring circuit, both high-speed operation and improved reliability can be realized without the need for significant hardware addition.

Embodiment 2. FIG.
In the first embodiment, even if the transfer cutoff signal receivers 21 and 22 receive the transfer cutoff signal during automatic inspection, the transfer cutoff signal receivers 21 and 22 are disconnected during automatic inspection. Although the circuit breaker cannot be removed until the inspection is completed, in the present embodiment, as shown in FIG. 2, transfer coupler signal receiving devices 21 and 22 are provided with photocouplers 101 and 102, and transfer is performed even during automatic inspection. Transfer interruption reception signals of the interruption signal receiving devices 21 and 22 are captured as an accident response 202 and incorporated into the accident response conditions shown in FIG. 5, so that even during automatic inspection, the automatic inspection can be stopped immediately and the circuit breaker can be tripped. I did it.

  As shown in FIG. 2, the configuration of the present embodiment is basically the same as the configuration of FIG. 1, and photocouplers 101 and 102 are added to the transfer cutoff signal receivers 21 and 22. The point is different. The photocoupler 101 is connected to the transfer cutoff signal receiver 21 in order to capture the state of the transfer cutoff signal receiver 21. Similarly, the photocoupler 102 is connected to the transfer cutoff signal receiver 22 in order to capture the state of the transfer cutoff signal receiver 22. When the transfer cut-off signal is received by the transfer cut-off signal receivers 21 and 22, even if it is during automatic inspection, the transfer cut-off received signal is taken in as an accident response 202 by the photocouplers 101 and 102. The automatic inspection is stopped and the circuit breaker tripping relay 2 is operated.

  As described above, in this embodiment, since the photocouplers 101 and 102 are provided in the transfer cutoff signal receivers 21 and 22, a system fault occurs during automatic inspection, and the transfer cutoff signal is received as the transfer cutoff signal. When the devices 21 and 22 receive the circuit breaker, the circuit breaker can be removed immediately without waiting for completion of the automatic inspection.

Embodiment 3 FIG.
In the first and second embodiments described above, when the circuit breaker is opened or the test terminal 24 is disconnected, the reading circuit of the photocouplers 103, 104, and 105 is cut off, and the contact state cannot be read. In the embodiment, as shown in FIG. 3, trip lock relay contacts 1 ₄ , 1 ₅ , 1 ₆ , ₁₇ are provided, and during automatic inspection, the circuit breaker tripping circuit is connected to the control power supplies P, N in its own device. Since it is switched to, inspection is always possible regardless of the state of the trip circuit. In FIG. 3, control power supplies P and N on which P and N symbols are written on the left side are the control power supplies of the device, and right reference signs P and N are control power supplies P and N of the circuit breaker tripping circuit. N.

As shown in FIG. 3, the configuration of the present embodiment is basically the same as the configuration of FIG. 2, and trip lock relay contacts 1 ₄ , 1 ₅ , 1 ₆ , 1 ₇ are added. Is different. Trip lock relay contacts 1 ₄ , ₁₅ are connected to two control power sources P, and trip lock relay contacts 1 ₆ , ₁₇ are connected to two control power sources N. As a result, during automatic inspection, the trip lock relay contacts 1 ₅ , ₁₇ that are normally closed are opened, and the trip lock relay contacts 1 ₄ , ₄ connected to the control power sources P, N in the device itself are opened. ₁₆ is closed, and the circuit breaker tripping circuit is switched to the control power supplies P and N in its own device.

As described above, according to the present embodiment, the trip lock relay contacts 1 ₄ , 1 ₅ , 1 ₆ , ₁₇ are provided, and during automatic inspection, the circuit breaker trip circuit is connected to the control power supply P, Since it is switched to N, inspection is always possible regardless of the state of the trip circuit. In the present embodiment, the example in which the present embodiment is applied to the configuration in FIG. 2 has been described. However, the present embodiment is not limited thereto, and the present embodiment may be applied to the configuration in FIG. In this case, the same effect can be obtained.

It is the block diagram which showed the structure of the automatic monitoring circuit of the protection relay apparatus which concerns on Embodiment 1 of this invention. It is the block diagram which showed the structure of the automatic monitoring circuit of the protection relay apparatus which concerns on Embodiment 2 of this invention. It is the block diagram which showed the structure of the automatic monitoring circuit of the protection relay apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the structure of the continuous monitoring circuit (contact input circuit check) provided in the automatic monitoring circuit of the protection relay apparatus of this invention. It is a flowchart which shows the flow of a process of the automatic inspection circuit provided in the automatic monitoring circuit of the protection relay apparatus of this invention. It is explanatory drawing which shows the structure of the continuous monitoring circuit (output circuit check) provided in the automatic monitoring circuit of the protection relay apparatus of this invention.

Explanation of symbols

  1 Trip lock relay, 2, 3 Circuit breaker tripping relay, 4 Circuit breaker tripping coil, 5, 6 Transfer cut-off signal reception relay (high-speed auxiliary relay), 21, 22 Transfer cut-off signal receiver, 24 For testing Terminal, 101, 102, 103, 104, 105, 106, 107 Photocoupler, 201 Trip lock output, 203 Accident detection (M) output (for forced operation), 204 Fault detection (FD) output, 205 Continuous monitoring circuit, 206 Automatic inspection circuit, 207 Continuous monitoring circuit.

Claims (3)

An automatic monitoring circuit of a protective relay device that trips a circuit breaker to protect a protection object,
A transfer cut-off signal receiving means for receiving a transfer cut-off signal that has been detected by the other protective relay device and transferred via a predetermined transmission device;
A first relay contact for closing when the transfer cutoff signal receiving means receives the transfer cutoff signal;
An auxiliary relay connected to the first relay contact, detecting that the transfer cutoff signal receiving means has received the transfer cutoff signal, and closing the first relay contact;
A second relay contact for closing upon detection of a fault in the device;
A circuit breaker tripping relay that detects a failure in the device and closes the second relay contact;
A circuit breaker trip circuit having trip circuit coils connected in series, wherein the first relay contact and the second relay contact are simultaneously closed and excited;
An automatic monitoring circuit for a protective relay device, wherein a high-speed auxiliary relay is used as the auxiliary relay for closing the first relay contact. A trip lock relay for disconnecting the transfer cutoff signal receiving means from the automatic monitoring circuit;
Automatic check means for automatically checking the automatic monitoring circuit in a state where the transfer cutoff signal receiving means is disconnected by the trip lock relay;
When the transfer cutoff signal receiving means is connected to the transfer cutoff signal receiving means and the transfer cutoff signal receiving means receives the transfer cutoff signal during the automatic inspection in the automatic inspection means, the reception is detected and the automatic inspection is stopped. The automatic monitoring circuit for the protective relay device according to claim 1, further comprising: an automatic inspection stopping unit that closes the first relay contact. A first control power source to which the tripping circuit is connected in normal times;
A second control power source provided independently of the first control power source;
A test terminal that opens when the protective relay device is tested;
Control power switching means for switching the trip circuit from the first control power source to the second control power source when the circuit breaker is open or the test terminal is open. An automatic monitoring circuit for a protective relay device according to claim 1 or 2.

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