Power distribution automation terminal self-propelled clock error detection circuit and method
Through detection circuits and methods, the 24-hour self-propelled clock error of the power distribution automation terminal is calculated, and the problem of self-propelled clock error detection is solved, the accuracy of fault judgment and isolation is improved, and the reliability and economical power supply are improved.
Patent Information
- Application Number
- CN202510360931.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2025-08-05
AI Technical Summary
The prior art lacks effective methods to detect errors in the self-propelled clock of the power distribution automation terminal, affecting the accuracy of fault judgment positioning and isolation.
It provides a self-propelled clock error detection circuit and method for power distribution automation terminals. It uses an optocoupler and CPU board to send a switch signal at a specific moment, read event records through a communication interface, and calculates a 24-hour self-propelled clock error.
It improves the accuracy of the self-propelled clock of the power distribution automation terminal, ensures the accuracy of grid fault judgment and isolation, and improves power supply reliability and economy.
Smart Images
Figure CN120428022A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of feeder automation, and in particular relates to a self-running clock error detection circuit and method for a distribution automation terminal. Background Art
[0002] At present, higher requirements are put forward for power supply reliability. As an important component of the distribution automation system, the distribution automation terminal is used on the feeder of the distribution network. It can monitor the electrical quantity information on the feeder in real time and control the opening and automatic positioning and isolation of the fault when a fault occurs on the feeder, and restore power supply to the non-fault section. It is of great significance for timely removal of the fault point, restoration of power supply, improvement of distribution network power supply reliability, improvement of power supply capacity and economy, and reduction of labor intensity.
[0003] The accuracy of the self-running clock of the distribution automation terminal is related to the accuracy of fault diagnosis, location and isolation. Therefore, relevant standards have stipulated the technical requirements for the error of the self-running clock of the distribution automation terminal, but there is a lack of methods to detect the error of the self-running clock of the distribution automation terminal. Summary of the Invention
[0004] In order to solve the above problems, the present invention provides a distribution automation terminal self-running clock error detection circuit and method. The specific technical solution is as follows:
[0005] On the one hand, a distribution automation terminal self-running clock error detection circuit is provided, comprising a distribution automation terminal D1, a distribution automation terminal self-running time detector D2, a clock synchronization device D3, and a DC power supply D4;
[0006] The distribution automation terminal D1 includes an optical coupler U1, a CPU board U2, a current limiting resistor R1, a current limiting resistor R2, a remote signaling common interface YXCOM, and a remote signaling interface YX1;
[0007] The CPU board U2 includes an input interface and a communication interface;
[0008] The distribution automation terminal self-running clock detector D2 includes an optical coupler U3, an optical coupler U4, a CPU board U5, a current limiting resistor R3, a current limiting resistor R4, a detection interface CL+, and a detection interface CL-;
[0009] The CPU board U5 includes an input interface, an output interface, a communication interface, and a B code timing interface.
[0010] Preferably, the CPU board U5 is connected to the CPU board U2 through a communication interface, and uses the 101 protocol or the 104 protocol to exchange information, completes the timing through the 101 protocol or the 104 protocol, and reads the event record SOE of the distribution automation terminal D1.
[0011] Preferably, the CPU board U5 is connected to the clock synchronization device D3 via a B-code timing interface, and can synchronize the CPU board U5 to a standard clock.
[0012] Preferably, the positive pole of the DC power supply D4 is connected to the remote signaling common interface YXCOM of the distribution automation terminal D1, the remote signaling interface YX1 of the distribution automation terminal D1 is connected to the detection interface CL+ of the distribution automation terminal self-running clock detector D2, and the detection interface CL- of the distribution automation terminal self-running clock detector D2 is connected to the negative pole of the DC power supply D4.
[0013] On the other hand, a method for detecting an error in a self-running clock of a distribution automation terminal is provided, comprising the following steps:
[0014] S1. At time T1 of the CPU board U5 clock of the distribution automation terminal self-running clock detector D2, the output of the CPU board U5 interface changes from a high level to a low level, the light-emitting diode of the optocoupler U4 turns on, current flows through it, and it emits light. The phototransistor of the optocoupler U4 turns on, the light-emitting diode of the optocoupler U1 and the light-emitting diode of the optocoupler U3 turn on, current flows through them, and they emit light. The phototransistor of the optocoupler U1 turns on, and the input interface of the CPU board U2 of the distribution automation terminal D1 is pulled from a high level to a low level. This event is captured by the CPU board U2 of the distribution automation terminal D1 and the time T2 of the distribution automation terminal D1 clock when the event occurs is recorded.
[0015] S2, the distribution automation terminal D2 sends the event record of the jump from high level to low level recorded by the input interface of the CPU board U2 (with time stamp T2) to the distribution automation terminal self-running clock detector D2 through the communication interface. The distribution automation terminal self-running clock detector D2 records the event record and time stamp T2;
[0016] S3, the CPU board U2 of the distribution automation terminal D2 is restored to open the interface;
[0017] S4. At the time T1+24 of the CPU board U5 clock of the distribution automation terminal self-running clock detector D2, the output of the CPU board U5 interface changes from a high level to a low level, the light-emitting diode of the optocoupler U4 turns on, current flows through it, and it emits light. The phototransistor of the optocoupler U4 turns on, the light-emitting diodes of the optocoupler U1 and the light-emitting diodes of the optocoupler U3 turn on, current flows through them, and they emit light. The phototransistor of the optocoupler U1 turns on, and the input interface of the CPU board U2 of the distribution automation terminal D1 is pulled from a high level to a low level. This event is captured by the CPU board U2 of the distribution automation terminal D1 and the time T3 of the distribution automation terminal D1 clock at which the event occurred is recorded.
[0018] S5. The distribution automation terminal D2 sends the event record of the transition from high level to low level (with time stamp T2) recorded by the input interface of the CPU board U2 to the distribution automation terminal self-running clock detector D2 through the communication interface. The distribution automation terminal self-running clock detector D2 records the event record and time stamp T3.
[0019] S6, the CPU board U2 of the distribution automation terminal D2 is reset to open the output interface, and the formula for calculating the error of the self-running clock of the distribution automation terminal D2 is:
[0020] ΔT=T3-24-T2.
[0021] The beneficial effects of the present invention are as follows: the distribution automation terminal self-running clock detector D2 uses an internal B-code time synchronization interface to ensure the accuracy of its own clock. The optical coupler U5 inside the distribution automation terminal self-running time detector D2 sends a switch signal at time T1 and time T1+24h, and reads the event record SOE of the distribution automation terminal D1 at time T1 and time T1+24h respectively through the communication interface to calculate the 24-hour self-running clock error of the distribution automation terminal. This is conducive to detecting the self-running clock error of the distribution automation terminal D1, improving the self-running time accuracy of the distribution automation terminal D1, and ensuring the accuracy of the fault diagnosis, location, and isolation of the primary line of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.
[0023] Figure 1 This is a schematic diagram of the self-running clock error detection circuit of the distribution automation terminal of the present invention. DETAILED DESCRIPTION
[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0025] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.
[0026] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.
[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
[0028] like Figure 1 As shown, a specific embodiment of the present invention provides a distribution automation terminal self-running clock error detection circuit and method, including a distribution automation terminal D1, a distribution automation terminal self-running time detector D2, a clock synchronization device D3, and a DC power supply D4;
[0029] The distribution automation terminal D1 includes an optical coupler U1, a CPU board U2, a current limiting resistor R1, a current limiting resistor R2, a remote signaling common interface YXCOM, and a remote signaling interface YX1;
[0030] CPU board U2 includes an input interface and a communication interface;
[0031] The distribution automation terminal self-running clock detector D2 includes an optical coupler U3, an optical coupler U4, a CPU board U5, a current limiting resistor R3, a current limiting resistor R4, a detection interface CL+, and a detection interface CL-;
[0032] The CPU board U5 includes an input interface, an output interface, a communication interface, and a B code timing interface.
[0033] The CPU board U5 is connected to the CPU board U2 through the communication interface, and uses the 101 protocol or the 104 protocol to exchange information, completes the time synchronization through the 101 protocol or the 104 protocol, and reads the event record SOE of the distribution automation terminal D1.
[0034] The CPU board U5 is connected to the clock synchronization device D3 via the B-code timing interface, and can synchronize the CPU board U5 to the standard clock.
[0035] The positive pole of the DC power supply D4 is connected to the remote signaling common interface YXCOM of the distribution automation terminal D1, the remote signaling interface YX1 of the distribution automation terminal D1 is connected to the detection interface CL+ of the distribution automation terminal self-running clock detector D2, and the detection interface CL- of the distribution automation terminal self-running clock detector D2 is connected to the negative pole of the DC power supply D4.
[0036] Among them, the distribution automation terminal D1 model is CSC-271F, and the clock synchronization device D3 model is PCS-9785-H2.
[0037] A specific embodiment of the present invention further provides a method for detecting an error in a self-running clock of a distribution automation terminal, which specifically includes the following steps:
[0038] S1. At the T1 moment of the CPU board U5 clock of the self-running clock detector D2 of the distribution automation terminal, the output of the CPU board U5 interface changes from high level to low level, the light-emitting diode of the optocoupler U4 is turned on and current flows through it to emit light, the phototransistor of the optocoupler U4 is turned on, the light-emitting diode of the optocoupler U1 and the light-emitting diode of the optocoupler U3 are turned on and current flows through them to emit light, the phototransistor of the optocoupler U1 is turned on, and the input interface of the CPU board U2 of the distribution automation terminal D1 is pulled from high level to low level. The event is captured by the CPU board U2 of the distribution automation terminal D1 and the time T2 of the distribution automation terminal D1 clock when the event occurs is recorded.
[0039] S2. The distribution automation terminal D2 sends the event record of the jump from high level to low level (with time stamp T2) recorded by the input interface of the CPU board U2 to the distribution automation terminal self-running clock detector D2 through the communication interface. The distribution automation terminal self-running clock detector D2 records the event record and time stamp T2.
[0040] S3. The CPU board U2 of the distribution automation terminal D2 is restored to open the output interface.
[0041] S4. At the time T1+24 of the CPU board U5 clock of the self-running clock detector D2 of the distribution automation terminal, the output of the interface of the CPU board U5 changes from high level to low level, the light-emitting diode of the optocoupler U4 is turned on and current flows through it, the phototransistor of the optocoupler U4 is turned on, the light-emitting diode of the optocoupler U1 and the light-emitting diode of the optocoupler U3 are turned on and current flows through them, the phototransistor of the optocoupler U1 is turned on, and the input interface of the CPU board U2 of the distribution automation terminal D1 is pulled from high level to low level. The event is captured by the CPU board U2 of the distribution automation terminal D1 and records the time T3 of the clock of the distribution automation terminal D1 when the event occurs.
[0042] S5. The distribution automation terminal D2 sends the event record of the jump from high level to low level (with time stamp T2) recorded by the input interface of the CPU board U2 to the distribution automation terminal self-running clock detector D2 through the communication interface. The distribution automation terminal self-running clock detector D2 records the event record and time stamp T3.
[0043] S6, the CPU board U2 of the distribution automation terminal D2 is reset to open the output interface, and the formula for calculating the error of the self-running clock of the distribution automation terminal D2 is:
[0044] ΔT=T3-24-T2
[0045] Those skilled in the art will appreciate that the units of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition of each example has been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.
[0046] In the embodiments provided in the present application, it should be understood that the division of units is merely a logical function division, and there may be other division methods in actual implementation, for example, multiple units can be combined into one unit, one unit can be split into multiple units, or some features can be ignored, etc.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.
Claims
1. A distribution automation terminal self-running clock error detection circuit, characterized in that: It includes a distribution automation terminal (D1), a distribution automation terminal self-running time detector (D2), a clock synchronization device (D3), and a DC power supply (D4); The distribution automation terminal (D1) includes an optical coupler (U1), a CPU board (U2), a current limiting resistor (R1), a current limiting resistor (R2), a remote signaling common interface (YXCOM), and a remote signaling interface (YX1), wherein the CPU board (U2) includes an input interface and a communication interface; The distribution automation terminal self-running clock detector (D2) comprises an optical coupler (U3), an optical coupler (U4), a CPU board (U5), a current limiting resistor (R3), a current limiting resistor (R4), a detection interface (CL+), and a detection interface (CL-), wherein the CPU board (U5) comprises an input interface, an output interface, a communication interface, and a B-code time synchronization interface.
2. A distribution automation terminal self-running clock error detection circuit according to claim 1, characterized in that: The communication interface of the CPU board (U5) is connected to the communication interface of the CPU board (U2), and information exchange is performed using the 101 protocol or the 104 protocol to read the event record SOE of the distribution automation terminal (D1).
3. A distribution automation terminal self-running clock error detection circuit according to claim 1, characterized in that: The optical coupler (U1), optical coupler (U3), and optical coupler (U4) are of model FOD817AS.
4. A distribution automation terminal self-running clock error detection circuit according to claim 1, characterized in that: The rated voltage of the DC power supply D4 is 24V or 48V.
5. The self-running clock error detection circuit for a distribution automation terminal according to claim 1, characterized in that: The positive electrode of the DC power supply (D4) is connected to the remote signaling common interface (YXCOM) of the distribution automation terminal (D1), the remote signaling interface (YX1) of the distribution automation terminal D1 is connected to the detection interface CL+ of the distribution automation terminal self-running clock detector (D2), and the detection interface (CL-) of the distribution automation terminal self-running clock detector (D2) is connected to the negative electrode of the DC power supply (D4).
6. A method for detecting errors in a self-running clock of a distribution automation terminal, characterized in that: The following steps are involved: S1, at the time T1 of the CPU board (U5) clock of the distribution automation terminal self-running clock detector (D2), the output of the CPU board (U5) interface changes from high level to low level, the light-emitting diode of the optocoupler (U4) is turned on and current flows through it, and it emits light, the phototransistor of the optocoupler (U4) is turned on, the light-emitting diode of the optocoupler (U1) and the light-emitting diode of the optocoupler (U3) are turned on and current flows through them, and they emit light, the phototransistor of the optocoupler (U1) is turned on, and the input interface of the CPU board (U2) of the distribution automation terminal (D1) is pulled from high level to low level, and the event is captured by the CPU board (U2) of the distribution automation terminal (D1) and recorded at the time T2 of the distribution automation terminal (D1) clock when the event occurs; S2, the distribution automation terminal (D2) sends the event record (with time stamp T2) of the jump from high level to low level recorded by the input interface of the CPU board (U2) to the distribution automation terminal self-running clock detector (D2) through the communication interface, and the distribution automation terminal self-running clock detector (D2) records the event record and time stamp T2; S3, the CPU board (U2) of the distribution automation terminal (D2) is reset to open the output interface; S4. At the time T1+24 hours of the CPU board (U5) clock of the self-running clock detector (D2) of the distribution automation terminal, the output of the CPU board (U5) interface changes from a high level to a low level, the light-emitting diode of the optocoupler (U4) is turned on and current flows through it, and the phototransistor of the optocoupler (U4) is turned on, the light-emitting diode of the optocoupler (U1) and the light-emitting diode of the optocoupler (U3) are turned on and current flows through them, and the phototransistor of the optocoupler (U1) is turned on, and the input interface of the CPU board (U2) of the distribution automation terminal (D1) is pulled from a high level to a low level. This event is captured by the CPU board (U2) of the distribution automation terminal (D1) and recorded at the time T3 of the distribution automation terminal (D1) clock when the event occurs; S5. The distribution automation terminal (D2) transmits the event record (with time stamp T2) of the jump from high level to low level recorded by the input interface of the CPU board (U2) to the distribution automation terminal self-running clock detector (D2) through the communication interface. The distribution automation terminal self-running clock detector (D2) records the event record and time stamp T3. S6. The CPU board (U2) of the distribution automation terminal (D2) is reset to open the output interface, and the formula for calculating the error of the self-running clock of the distribution automation terminal (D2) is ΔT = T3-24-T2.