Broken line detection implementation method applied to load management branch device

Abstract

The invention discloses a disconnection detection implementation method applied to a load management branch device, and the technical scheme comprises the steps: enabling equipment to be capable of distinguishing a disconnection detection instruction and a remote control tripping instruction through the difference of the widths of pulse signals received by a remote signaling port by expanding a DL / T645-2007 protocol; therefore, on the basis that the on-site stock station area does not have the condition of control loop disconnection detection hardware, the disconnection detection function is achieved in the mode that software is matched with existing hardware, and meanwhile the disconnection detection function is achieved by expanding disconnection detection instructions and remote control tripping instruction enabling commands. It is stipulated that the load management branch apparatus must only respond to the relevant signal within the enable command valid time period. According to the invention, the problem that the on-site stock area does not have a broken line detection function is solved, the tripping success rate is improved, the error tripping rate is reduced, the reliability of load management work of the transformation area is greatly improved, and meanwhile, by expanding remote signaling and remote control event records, the reliability of the load management work is improved. And abundant field orderly power utilization management data is provided for theoretical analysis of load management work.

Description

Technical Field

[0001] The present invention relates to the technical field of load control for orderly power consumption management, and particularly to a method for realizing disconnection detection applied to a load management branch device. Background Art

[0002] At present, with the rapid development of China's economy, the demand for energy, especially electric power energy, in social production and life is increasing day by day. At the same time, the transformation and upgrading of China's industrial structure continue. The secondary industry dominated by industry and the tertiary industry dominated by the service industry have achieved great development. The demand for electric power in economic development not only increases day by day in quantity, but also puts forward unprecedented new requirements in quality. After years of construction, the development and reform commissions at all levels and power grid companies have achieved a series of remarkable results in the management work of regulating, controlling and optimizing the operation of electric power loads by comprehensively adopting economic, administrative, technical and other means.

[0003] With the continuous progress of load management work, the requirements of power grid companies at all levels for the reliability of load management work are gradually increasing. At present, the reliability of newly developed special transformer terminals and branch devices has great advantages compared with the transformation of existing substations in the field. On the one hand, it is because newly developed devices often have relevant reliability designs for load management work in terms of software and hardware, such as control loop disconnection detection circuits, etc. On the other hand, there are some compatibility problems during the transformation of existing substations in the field.

[0004] At present, for the transformation of existing substations in the field, the most prominent problem is the insufficient reliability of load control. Generally speaking, the current transformation plan is generally to add branch devices under the existing special transformer terminals to complete line metering and the status monitoring and tripping of low-voltage side circuit breakers. However, since the existing terminals in the field do not have the detection of the connection status of their own control loops, such as control loop disconnection detection circuits, tripping failures frequently occur in the field due to abnormal line problems such as poor contact of control signal lines between special transformer terminals and branch devices, which greatly affects the reliability of load control. Summary of the Invention

[0005] In view of the deficiencies and defects existing in the prior art, the present invention provides a method for realizing disconnection detection applied to a load management branch device. The device supports receiving pulse signals of different widths through a telecontrol signal port by extending the DL / T645-2007 protocol, so as to distinguish disconnection detection instructions from remote control tripping instructions, thereby realizing disconnection detection between the upstream special transformer terminal and the load management branch device.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A method for realizing disconnection detection applied to a load management branch device, characterized by comprising the following steps:

[0008] Step 1: The device stipulates that a pulse signal with a width of 100 ms received by its first remote signal interface is a disconnection detection signal, and a pulse signal of 300 ms is a remote control tripping signal; by distinguishing the pulse width, the device supports both the disconnection detection signal and the remote control tripping signal at the same time;

[0009] Step 2: Two DL / T645-2007 protocol data identifiers are extended, which are respectively used to enable the load management branch device to identify the disconnection detection signal and the remote control tripping signal. That is, after the device receives the corresponding data identifier command, it should start to identify the disconnection detection signal or the remote control tripping signal within the specified time, and immediately stop identifying the above signals after exceeding the recognizable time;

[0010] Step 3: After the device recognizes the disconnection detection signal, it actively sets the specified bit of its reported status word to 1, and automatically clears this bit after the upstream device reads the status word, so that the device can support repeated disconnection detections; and when the device recognizes the tripping signal, it immediately executes the tripping operation;

[0011] Step 4: The device has the function of recording remote signal and remote control events, and enables the upstream dedicated transformer terminal to access the remote signal and remote control records of the device by extending the remote signal and remote control event record data identifiers in the DL / T645-2007 protocol format;

[0012] Further, for the signal recognition in Step 3, the recognition method is to periodically check the remote signal event record recorded in Step 4. By only retrieving the most recent remote signal change record, it is confirmed whether there is a disconnection detection signal or a remote control tripping signal generated, so as to achieve the purpose of avoiding repeated tripping;

[0013] Further, for the remote signal event record in Step 4, its data identifier is 0x1D01FF00, which contains the most recent 10 remote signal change records. Each record is 10 bytes, including 1 byte of remote signal channel number, 1 byte of current remote signal status, and 8 bytes of change occurrence time, with a time accuracy of 1 millisecond;

[0014] Further, for the remote control event record in Step 4, its data identifier is 0x1D02FF00, which contains the most recent 10 remote control change records. Each record is 10 bytes, including 1 byte of remote control channel number, 1 byte of current relay opening and closing status, and 8 bytes of the occurrence time of the opening and closing status change, with a time accuracy of 1 millisecond;

[0015] Further, the pulse widths of the disconnection detection signal and the tripping signal specified in step 1 can be modified through an extended protocol, and the device allows an error of ±50 ms to improve compatibility;

[0016] Further, when the device performs a tripping operation in step 3, the relay operation mode is pulsed, and the pulse operation time is the same as the pulse width of the tripping signal specified in step 1;

[0017] The beneficial technical effects of the present invention are as follows: The method enables the load management branch device to have an upward control loop disconnection detection in software functions, so that when the on-site orderly power consumption work is transformed, based on the on-site existing substation hardware, the disconnection detection of the special transformer terminal control loop can be realized through software, thereby timely discovering possible line problems on-site. At the same time, by increasing the effective time of the enable command, the possibility of on-site mis-tripping is greatly reduced; In addition, the device can enable the upstream device to further understand the actual occurrence time of the on-site load management work and obtain more detailed on-site tripping data by expanding the remote signal and remote control event records, providing rich first-line data for the orderly power consumption work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall flowchart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

[0020] As Figure 1 shown, a method for realizing disconnection detection applied to a load management branch device has the following implementation process:

[0021] The device itself has a remote signal function and can accurately record the occurrence of remote signal changes. The remote signal recognition time accuracy is 1 millisecond. The remote signal recording function is independent of the upstream enable signal. The remote control signal of the special transformer terminal is connected to the first remote signal terminal of the load management branch device.

[0022] Before the special transformer terminal performs disconnection detection, it needs to first send a disconnection detection enable command. After the device receives the enable command, it starts to periodically check the remote signal change records it has recorded every 100 ms to detect whether there is a pulse that meets the disconnection detection signal width. If such a signal is detected within the effective time of the enable command, the corresponding bit of the active reporting status word will be set to 1, and after the upstream device reads this status word through the DL / T 645-2007 protocol, this bit will be cleared.

[0023] Before the dedicated terminal performs a remote trip, it needs to send a remote trip enable command first. After receiving the enable command, the device starts to periodically check the remote signal change records it has recorded every 100 ms to detect whether there is a pulse that meets the width of the remote trip signal. If such a signal is detected within the valid time of the enable command, it controls its own relay to complete the pulse trip operation and records the start and end times of the relay action to generate a remote control event record.

[0024] The above embodiments are illustrative of the specific embodiments of the present invention and not a limitation thereof. Those skilled in the relevant technical fields can still make various transformations and changes to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be incorporated into the patent protection scope of the present invention.

Claims

1. A method for realizing disconnection detection applied to a load management branch device, characterized in that, It includes the following steps: Step 1: The device defines that a pulse signal with a width of 100 ms received by its first remote signaling interface is a disconnection detection signal, and a pulse signal of 300 ms is a remote control tripping signal; by distinguishing the pulse width, the device supports both the disconnection detection signal and the remote control tripping signal at the same time; Step 2: Two DL / T645-2007 protocol data identifiers are extended, which are respectively used to enable the load management branch device to identify the disconnection detection signal and the remote control tripping signal; that is, after the device receives the corresponding data identifier command, it should start to identify the disconnection detection signal or the remote control tripping signal within the specified time, and immediately stop identifying the above signals after exceeding the recognizable time; Step 3: After the device recognizes the disconnection detection signal, it actively sets the specified bit of its reported status word to 1, and automatically clears this bit after the upstream device reads the status word, so that the device can support repeated disconnection detections; and when the device recognizes the tripping signal, it immediately performs the tripping operation; Step 4: The device has the function of recording remote signaling and remote control events, and enables the upstream dedicated transformer terminal to access the remote signaling and remote control records of the device by extending the remote signaling and remote control event record data identifiers in the DL / T645-2007 protocol format.

2. The method for realizing disconnection detection applied to a load management branch device according to claim 1, characterized in that, For the signal recognition in Step 3, the recognition method is to periodically check the remote signaling event record recorded in Step 4. By only retrieving the most recent remote signaling change record, it is confirmed whether there is a disconnection detection signal or a remote control tripping signal generated, so as to achieve the purpose of avoiding repeated tripping.

3. The method for realizing disconnection detection applied to a load management branch device according to claim 1, characterized in that, For the remote signaling event record in Step 4, its data identifier is 0x1D01FF00, which contains the most recent 10 remote signaling change records. Each record is 10 bytes, including 1 byte of remote signaling channel number, 1 byte of the current remote signaling status, and 8 bytes of the time when the change occurred, with a time accuracy of 1 millisecond.

4. The method for realizing open-circuit detection applied to a load management branch device according to claim 1, wherein For the remote control event record in Step 4, its data identifier is 0x1D02FF00, which contains the most recent 10 remote control change records. Each record is 10 bytes, including 1 byte of remote control channel number, 1 byte of the current relay opening and closing state, and 8 bytes of the time when the opening and closing state changes occurred, with a time accuracy of 1 millisecond.

5. The method for realizing disconnection detection applied to a load management branch device according to claim 1, characterized in that, The pulse widths of the disconnection detection signal and the tripping signal specified in Step 1 can be modified through an extended protocol, and the device allows an error of ±50 ms to improve compatibility.

6. The method for realizing disconnection detection of an application to a load management branch device according to claim 1, characterized in that, When the device performs the tripping operation in Step 3, the relay action mode is pulse type, and its pulse action time is the same as the pulse width of the tripping signal specified in Step 1.

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