CN106656575A - Fault diagnosis method suitable for longitudinal protection multiplex channel - Google Patents

Abstract

The invention discloses a fault diagnosis method suitable for multiplex channels of longitudinal protection: step 1, defining a channel fault diagnosis frame; step 2, when a device in the channel detects a channel fault, the device generates a channel fault diagnosis frame; step 3, when the device receives the data message from the previous device and does not receive the channel fault diagnosis frame sent by the previous device after a delay of ΔT, the device sends the generated channel fault diagnosis frame to the next A device, otherwise, directly forwards the received channel fault diagnosis frame to the next device; step 4, the protection devices on both sides send out the alarm of the channel fault point and fault type; step 5, when the device in the channel sends the channel fault diagnosis frame After detecting that the channel fault returns to normal, the device stops sending the channel fault diagnosis frame, and the protection device returns to the corresponding channel fault point and fault type alarm after a delay time T. Greatly improve the efficiency of multiplexing channel fault recovery.

Description

A Fault Diagnosis Method Applicable to Multiplexing Channels of Pilot Protection

technical field

The invention relates to a fault diagnosis method suitable for multiplexing channels of longitudinal protection.

Background technique

With the widespread use of optical fiber longitudinal protection in the power grid, channel failures occur from time to time. Once the channel fails, the protection in operation will stop running. Protection and communication personnel must quickly determine the channel fault point and fault type and repair it in time . Since the multiplexing channel involves many intermediate links, many of which are in charge of the communication department, the protection and communication personnel are not familiar with each other's equipment, and it is difficult to locate the fault point of the channel.

At present, the domestic common method of dealing with multiplex channel faults is to locate the fault point by means of self-looping of each link in the channel. This method has many steps, is inefficient, and takes a long time. It also requires protection personnel in the substations on both sides. Experiment at the same time. Domestic patents mainly focus on channel performance detection and channel test equipment. Patents for channel fault diagnosis are also applicable to dedicated channels for direct optical fiber connections. No patents or papers on multiplexed channel fault diagnosis have been seen for the time being.

Contents of the invention

In view of the above problems, the present invention provides a fault diagnosis method suitable for the multiplexing channel of the longitudinal protection, which can quickly and automatically locate the fault point of the channel and determine the fault type of the channel, greatly improve the efficiency of fault recovery of the multiplexing channel, and quickly restore the fault of the longitudinal protection running.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

A method for fault diagnosis applicable to multiplexing channels of longitudinal protection, characterized in that it comprises the following steps:

Step 1. Define a channel fault diagnosis frame for channel fault diagnosis. The channel fault diagnosis frame includes a device identification byte and a channel fault type byte. The device identification byte is used to identify the device sending the channel fault diagnosis frame. The channel fault type byte is used to identify the channel fault type; all devices in the channel can generate and send channel fault diagnosis frames;

Step 2. When there is no fault in the channel, the data message is transmitted in the channel; when a device in the channel detects a channel fault, the device generates a channel fault diagnosis frame and enters step 3;

Step 3. After the device receives the data message from the previous device, it delays for ΔT time. If it does not receive the channel fault diagnosis frame sent by the previous device within the delay time of ΔT, the device sends the generated The channel fault diagnosis frame is sent to the next device, otherwise, the received channel fault diagnosis frame is directly forwarded to the next device;

Among them, after the device in the channel sends out the channel fault diagnosis frame generated by the device, it will continue to send out the channel fault diagnosis frame according to a fixed delay before the channel fault disappears. If it receives the channel fault diagnosis frame sent by other devices during the period, then forward directly;

Step 4. When the protection device on one side receives the channel fault diagnosis frame, it continues to forward the channel fault diagnosis frame to the opposite side protection device, and the protection devices on both sides send out the alarm of the channel fault point and fault type;

Step 5. When the device in the channel that sends the channel fault diagnosis frame detects that the channel fault returns to normal, the device stops sending the channel fault diagnosis frame, and the protection device returns to the alarm of the corresponding channel fault point and fault type after a delay of T.

Preferably, in step 3, the device in the channel will not forward the channel fault diagnosis frame to the next device after receiving the fault diagnosis frame sent by the device last time.

Preferably, ΔT is the maximum delay required for the last device to send the channel fault diagnosis frame.

Preferably, the device identification byte includes a plurality of bits, and each bit corresponds to a device in a channel. When initializing, each bit position is 0, and when a device detects a channel failure, the corresponding bit position is 1; channel failure The type byte includes multiple bits, each bit corresponds to a fault type, and each bit position is 0 at initialization, when a device detects a channel fault type, the corresponding bit position is 1; the protection device reads the channel The byte bit of 1 in the fault diagnosis frame finds the corresponding device in the channel and the fault type of the channel.

The beneficial effects of the present invention are:

A channel fault diagnosis frame specially used for channel fault diagnosis is added to the transmission message in the multiplexing channel, and the device identification byte and channel fault type byte are defined in the frame, which can quickly and automatically locate the channel fault point and determine the channel fault type, which greatly improves the efficiency of multiplex channel fault recovery and quickly restores the operation of the longitudinal protection.

Description of drawings

Fig. 1 is a definition schematic diagram of channel fault diagnosis frame of the present invention;

Fig. 2 is a schematic diagram of the definition of the marked byte of the device of the present invention;

Fig. 3 is a schematic diagram of the definition of the channel fault byte in the present invention;

Fig. 4 is a flow chart of a fault diagnosis method applicable to the multiplexing channel of the longitudinal protection according to the present invention.

detailed description

The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

A fault diagnosis method suitable for multiplexing channels of longitudinal protection, comprising the following steps:

Step 1. Define the channel fault diagnosis frame for channel fault diagnosis. As shown in Figure 1, the channel fault diagnosis frame includes a device identification byte and a channel fault type byte, and the device identification byte is used to identify and issue a channel fault diagnosis frame device, the channel fault type byte is used to identify the channel fault type. A channel fault diagnosis frame specially used for channel fault diagnosis is added to the transmission message in the multiplexing channel, and all devices in the channel can generate and send out the channel fault diagnosis frame.

Step 2. When there is no fault in the channel, data messages (normal transmission messages) are transmitted in the channel, that is, during normal operation, there are only normal transmission messages in the channel, and there is no channel fault diagnosis frame.

When a device in the channel detects a channel fault (generally, the device is also the closest to the fault point), the device generates a channel fault diagnosis frame and enters step 3.

Taking Figures 2 and 3 as examples, the device identification byte includes multiple (8 in Figure 2) bits, each bit corresponds to a device (including a protection device) in a channel, and each bit position is 0 during initialization, When a device detects a channel failure, it sets the corresponding bit position to 1. The channel fault type byte includes multiple (8 in Figure 2) bits, each bit corresponds to a fault type, each bit position is 0 during initialization, when a device detects a channel fault type, the corresponding Bit position 1. When a device in the channel detects a channel fault, the device will generate a channel fault diagnosis frame, and set the corresponding bit in the device identification byte and the channel fault type byte to 1.

Among them, the number of device identification bytes and channel fault type bytes can be expanded according to the number of devices in the multiplexed channel and the channel fault type. Specifically, the device identification byte and the channel fault type byte are respectively extended by spare 1 and spare 2 shown in FIG. 1 .

Step 3. After the device receives the normally transmitted data message from the previous device, it delays for ΔT time. If it does not receive the channel fault diagnosis frame sent by the previous device within the delay time of ΔT, the device sends The generated channel fault diagnosis frame is sent to the next device, otherwise, the received channel fault diagnosis frame is directly forwarded to the next device.

Generally, ΔT is the maximum delay required for the last device to send a channel fault diagnosis frame. Assume that the two ends of a channel are protection device 1 and protection device 2, and there are equipment A, Device B and device C, the data transmission sequence in the channel is protection device 1-device A-device B-device C-protection device 2-device C-device B-device A-protection device 1, and so on, each device The previous device and the next device are generated according to the transmission line.

Among them, after the device in the channel sends out the channel fault diagnosis frame generated by the device, it will continue to send out the channel fault diagnosis frame according to a fixed delay before the channel fault disappears. If it receives the channel fault diagnosis frame sent by other devices during the period, then Retweet directly.

Step 4. After receiving the channel fault diagnosis frame, the protection device on one side continues to forward the channel fault diagnosis frame to the opposite side protection device, and the protection devices on both sides send out the channel fault point and fault type alarm. The protection device finds the corresponding device in the channel and the channel fault type by reading the byte bit of 1 in the channel fault diagnosis frame.

Step 5. When the device that sent the channel fault diagnosis frame in the channel detects that the channel fault returns to normal, the device stops sending the channel fault diagnosis frame, and the protection device does not receive the channel fault frame of the device within the delay time T and then returns to the corresponding Channel fault point and fault type alarm. The entire flow chart is shown in Figure 4.

Preferably, in step 3, the device in the channel will not forward the channel fault diagnosis frame to the next device after receiving the fault diagnosis frame sent by the device last time, thus forming a transmission ring.

A channel fault diagnosis frame specially used for channel fault diagnosis is added to the transmission message in the multiplexing channel, and the device identification byte and channel fault type byte are defined in the frame, which can quickly and automatically locate the channel fault point and determine the channel fault type, which greatly improves the efficiency of multiplex channel fault recovery and quickly restores the operation of the longitudinal protection.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (4)

1. A fault diagnosis method applicable to the multiplexing channel of longitudinal protection, is characterized in that, comprises the steps: Step 1. Define a channel fault diagnosis frame for channel fault diagnosis. The channel fault diagnosis frame includes a device identification byte and a channel fault type byte. The device identification byte is used to identify the device sending the channel fault diagnosis frame. The channel fault type byte is used to identify the channel fault type; all devices in the channel can generate and send channel fault diagnosis frames; Step 2. When there is no fault in the channel, the data message is transmitted in the channel; when a device in the channel detects a channel fault, the device generates a channel fault diagnosis frame and enters step 3; Step 3. After the device receives the data message from the previous device, it delays for ΔT time. If it does not receive the channel fault diagnosis frame sent by the previous device within the delay time of ΔT, the device sends the generated The channel fault diagnosis frame is sent to the next device, otherwise, the received channel fault diagnosis frame is directly forwarded to the next device; Among them, after the device in the channel sends out the channel fault diagnosis frame generated by the device, it will continue to send out the channel fault diagnosis frame according to a fixed delay before the channel fault disappears. If it receives the channel fault diagnosis frame sent by other devices during the period, then forward directly; Step 4. When the protection device on one side receives the channel fault diagnosis frame, it continues to forward the channel fault diagnosis frame to the opposite side protection device, and the protection devices on both sides send out the alarm of the channel fault point and fault type; Step 5. When the device in the channel that sends the channel fault diagnosis frame detects that the channel fault returns to normal, the device stops sending the channel fault diagnosis frame, and the protection device returns to the alarm of the corresponding channel fault point and fault type after a delay of T. 2. A kind of fault diagnosis method applicable to the multiplexing channel of vertical protection according to claim 1, characterized in that, in step 3, after the equipment in the channel receives the fault diagnosis frame sent by the equipment last time, it will no longer Forward this channel fault diagnostic frame to the next device. 3. A fault diagnosis method applicable to multiplexed channels of longitudinal protection according to claim 1, wherein ΔT is the maximum delay required for the last device to send a channel fault diagnosis frame. 4. A kind of fault diagnosis method applicable to the multiplexing channel of vertical protection according to claim 1, characterized in that, the device marking byte comprises a plurality of bits, and each bit corresponds to a device in a channel, and the initialization When each bit position is 0, when a device detects a channel fault, the corresponding bit position is set to 1; the channel fault type byte includes multiple bits, each bit corresponds to a fault type, and each bit position is initialized 0, when a device detects a channel fault type, the corresponding bit position is set to 1; the protection device finds the corresponding device in the channel and channel fault type by reading the byte bit of 1 in the channel fault diagnosis frame.