CN108270285B - Digital power distribution terminal and control method thereof - Google Patents
Digital power distribution terminal and control method thereof Download PDFInfo
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- CN108270285B CN108270285B CN201611260101.8A CN201611260101A CN108270285B CN 108270285 B CN108270285 B CN 108270285B CN 201611260101 A CN201611260101 A CN 201611260101A CN 108270285 B CN108270285 B CN 108270285B
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Abstract
The embodiment of the invention provides a digital power distribution terminal and a control method thereof, wherein the digital power distribution terminal is connected with a circuit breaker, and comprises: a main control circuit and an input/output control circuit; the input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the master control circuit includes: the operation module is used for carrying out operation processing on the sampling data of the digital power distribution terminal and outputting various operation parameters; the protection module is used for judging whether protection operation needs to be started or not according to the operation parameters; and the execution module is used for sending a control signal to the circuit breaker through the input/output control circuit if the protection operation is required to be started, so that the circuit breaker executes the operation corresponding to the control signal. According to the embodiment of the invention, the protection and control functions are added to the digital power distribution terminal, and the safety and reliability of the power distribution system are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of power distribution, in particular to a digital power distribution terminal and a control method thereof.
Background
The distribution system is a system of the section from a step-down distribution substation (high-voltage distribution substation) to a user side in the power system. The power distribution system is a power network system which is composed of various power distribution equipment (or elements) and power distribution facilities, converts voltage and distributes electric energy directly to a user side.
In a conventional power distribution system, a large number of meters, such as an ammeter, a voltmeter, an ammeter and the like, are arranged on a power distribution cabinet to indicate data of current, voltage, electric energy and the like. When data such as current, voltage, electric energy appear unusual, cause harm even incident to the switch board easily, the switch board can't protect and control oneself.
Disclosure of Invention
The embodiment of the invention provides a digital power distribution terminal and a control method thereof, which are used for solving the problem that the existing power distribution cabinet cannot protect and control the digital power distribution terminal.
According to an aspect of an embodiment of the present invention, there is provided a digital power distribution terminal connected to a circuit breaker, the digital power distribution terminal including: a main control circuit and an input/output control circuit; the input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the master control circuit includes:
the operation module is used for carrying out operation processing on the sampling data of the digital power distribution terminal and outputting various operation parameters;
the protection module is used for judging whether protection operation needs to be started or not according to the operation parameters;
and the execution module is used for sending a control signal to the circuit breaker through the input/output control circuit if the protection operation is required to be started, so that the circuit breaker executes the operation corresponding to the control signal.
According to an aspect of the embodiment of the present invention, there is also provided a control method of a digital power distribution terminal, the digital power distribution terminal being connected to a circuit breaker, the digital power distribution terminal including: a main control circuit and an input/output control circuit; the input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the master control circuit includes: a microprocessor;
the microprocessor is adopted to carry out operation processing on the sampling data of the digital power distribution terminal, and each operation parameter is output;
judging whether a protection operation needs to be started or not according to the operation parameters;
and if the protection operation is required to be started, sending a control signal to the circuit breaker through the input/output control circuit, so that the circuit breaker executes the operation corresponding to the control signal.
According to the digital power distribution terminal and the control method thereof provided by the embodiment of the invention, the digital power distribution terminal is connected with a circuit breaker, and the digital power distribution terminal comprises: the main control circuit is used for judging whether the power distribution system needs to be protected or not; the input/output control circuit is used for connecting the main control circuit and the circuit breaker and transmitting a control signal of the main control circuit to the circuit breaker; the circuit breaker is controlled by the main control circuit and is used for protecting the distribution line and the electric equipment. In one possible embodiment, the master circuit includes: the operation module is used for carrying out operation processing on the sampling data of the digital power distribution terminal and outputting various operation parameters; the protection module is used for judging whether protection operation needs to be started or not according to various operation parameters; and the execution module is used for sending a control signal to the circuit breaker through the input/output control circuit if the protection operation needs to be started, so that the circuit breaker executes the operation corresponding to the control signal. According to the digital power distribution terminal, the protection and control functions are added, the circuit breaker is controlled by the main control circuit to protect the power distribution system, and the safety and reliability of the power distribution system are improved.
Drawings
Fig. 1 is a block diagram of a digital power distribution terminal according to a first embodiment of the present invention;
fig. 2 is a block diagram of a digital power distribution terminal according to a second embodiment of the present invention;
fig. 3 is a flowchart of the steps of a control method of a digital power distribution terminal according to a third embodiment of the present invention;
fig. 4 is a flowchart of the steps of a control method of a digital power distribution terminal according to a fourth embodiment of the present invention.
Detailed Description
The following description of embodiments of the present invention will be made in further detail with reference to the drawings (like numerals designate like elements throughout the several views) and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
It will be appreciated by those of skill in the art that the terms "first," "second," etc. in embodiments of the present invention are used merely to distinguish between different steps, devices or modules, etc., and do not represent any particular technical meaning nor necessarily logical order between them.
Example 1
Referring to fig. 1, a block diagram of a digital power distribution terminal according to a first embodiment of the present invention is shown.
The digital power distribution terminal in this embodiment is connected to the circuit breaker 104, and the digital power distribution terminal includes: a master circuit 100 and an input-output control circuit 102. The input/output control circuit 102 is connected to the main control circuit 100 and the circuit breaker 104, respectively. The master circuit 100 includes: the operation module 1000 is configured to perform operation processing on sampling data of the digital power distribution terminal, and output each operation parameter. The protection module 1002 is configured to determine whether a protection operation needs to be started according to each operation parameter. The execution module 1004 is configured to send a control signal to the circuit breaker 104 through the input/output control circuit 102 if the protection operation needs to be started, so that the circuit breaker executes an operation corresponding to the control signal.
In this embodiment, the main control circuit 100 performs operation processing and outputs various operation parameters and analysis and judgment of protection function through an internal microprocessor (Microcontroller Unit, MCU) (which may be an advanced reduced instruction set computer (Advanced RISC Machines, ARM) single chip microcomputer, a digital signal processor (Digital Signal Processing, DSP), a Field programmable gate array (Field-Programmable Gate Array, FPGA), preferably an ARM single chip microcomputer), and performs control function, and sends a control signal to the input/output control circuit 102 to control the action of the circuit breaker 104 in the distribution line, thereby realizing protection and control functions.
In this embodiment, the master control circuit 100 further includes a communication/power isolation circuit and a communication interface module, where the MCU is connected to the communication interface module through the communication/power isolation circuit (the communication interface may be an RS485 interface or a controller area network (Controller Area Network, CAN) interface). The main control circuit 100 further includes a Memory module (such as an electrically erasable programmable read-Only Memory (Electrically Erasable Programmable Read-Only Memory) and a serial peripheral interface (Serial Peripheral Interface Flash, SPI Flash)), a Real Time Clock (RTC) module, and a backup battery, and the main control circuit 100 is further connected to a display module for displaying various operation parameters monitored by the digital power distribution terminal in Real Time.
The input-output control circuit 102 is composed of a digital isolation circuit and a dry-contact input/output circuit. The main control circuit 100 judges the opening and closing state of the circuit breaker; the dry contact output circuit is configured to transmit a control signal output by the main control circuit 100 to control the circuit breaker 104 in the distribution line to operate, for example, the electric operating mechanism may be controlled to implement opening and closing of the circuit breaker 104.
According to the digital power distribution terminal provided in the embodiment, the digital power distribution terminal is connected with a circuit breaker, and the digital power distribution terminal includes: the main control circuit is used for judging whether the power distribution system needs to be protected or not; the input/output control circuit is used for connecting the main control circuit and the circuit breaker and transmitting a control signal of the main control circuit to the circuit breaker; the circuit breaker is controlled by the main control circuit and is used for protecting the distribution line and the electric equipment. In one possible embodiment, the master circuit includes: the operation module is used for carrying out operation processing on the sampling data of the digital power distribution terminal and outputting various operation parameters; the protection module is used for judging whether protection operation needs to be started or not according to various operation parameters; and the execution module is used for sending a control signal to the circuit breaker through the input/output control circuit if the protection operation needs to be started, so that the circuit breaker executes the operation corresponding to the control signal. The digital power distribution terminal of the embodiment has the protection and control functions, and the main control circuit controls the circuit breaker to protect the power distribution system, so that the safety and reliability of the power distribution system are improved.
Example two
Referring to fig. 2, a block diagram of a digital power distribution terminal according to a second embodiment of the present invention is shown.
This embodiment emphasizes the difference from the above embodiment, and the same points may be referred to the description and the illustration in the above embodiment, and will not be repeated here.
The digital power distribution terminal in this embodiment includes: a voltage and current acquisition circuit 106, a temperature acquisition circuit 108, and an Analog Digital (AD) sampling module 110. The above-mentioned sampling data can be acquired by the voltage and current acquisition circuit 106 and the temperature acquisition circuit 108. The voltage and current acquisition circuit 106 includes a voltage transformer 1060, a current transformer 1061, a residual current transformer 1062, a filter circuit 1063, an ammeter chip 1064, an amplifying circuit 1065, and a port protection module 1066. The voltage and current acquisition circuit 106 is used for acquiring voltage signals, current signals and residual current signals of the distribution line, including metering acquisition and protection acquisition. The metering and collecting is that the voltage signal and the current signal are connected to the ammeter chip 1064 through the filter circuit 1063, and the ammeter chip 1064 is connected with the MCU of the main control circuit 100, so that electric energy charging, voltage and current real-time detection, electric energy quality analysis, electric energy pulse output, user electricity statistics and the like can be performed. The protection acquisition is to transmit the voltage signal, the current signal and the residual current signal to the main control circuit 100 through the AD sampling module 110 after passing through the amplifying circuit 1065 and the port protection module 1066, and perform operation, analysis and judgment through the MCU of the main control circuit 100, and protect the distribution line and the electric equipment by controlling the circuit breaker 104. The current signal and the residual current signal are detected by a current transformer 1061 and a residual current transformer 1062, respectively, and the voltage signal is detected by a voltage transformer 1060. After the temperature sensor 1080 in the temperature acquisition circuit 108 acquires a temperature signal, the temperature signal is transmitted to the MCU of the main control circuit 100 through the digital isolation circuit 1081 of the temperature acquisition circuit 108, and the MCU of the main control circuit 100 can be used for acquiring the temperature of cables, copper bars, connectors and the like, can alarm an electric fire through judging the temperature signal, and then can protect a distribution line through controlling the circuit breaker 104.
Optionally, the protection module 1002 includes: sampling instant-break processing threads and protection processing threads; the sampling instantaneous interruption processing thread is used for judging whether instantaneous protection operation needs to be started or not according to the first data obtained by calculation of each operation parameter; an execution module 1004, configured to call an instantaneous protection program to execute an instantaneous protection operation if the instantaneous protection operation needs to be started; if the instantaneous protection operation does not need to be started, calculating the effective value of the first data, and sending the effective value to the protection processing thread. The first data may be a current value, a voltage value, a residual current value, or the like.
The sampling instantaneous interruption processing thread is triggered by the AD sampling module 110, is the highest priority thread, is a time base triggering thread of all protection processing, runs once every T2 (0.3125 ms), samples and calculates data (current value, voltage value, residual current value and the like) in real time, stores the data in a temporary buffer area, simultaneously analyzes, judges and executes an instantaneous protection function, and invokes an instantaneous interruption processing protection program if the instantaneous protection function is executed; otherwise, if the operation is continuously performed for a preset number of times, for example, after 64 times, namely, one cycle, the effective value of the data is calculated, and the protection processing thread is notified to perform judgment processing of other protection except the instantaneous interruption protection.
The time of one cycle is T1, T1 is the reciprocal of the alternating current frequency, and the running times of one cycle are 64 times, for example, when the frequency is 50HZ, T1 is 20ms.
The protection processing thread is used for calculating second data according to the effective value and judging whether other protection operations except the instantaneous protection operation need to be started or not according to the second data; the execution module 1004 is configured to trigger the circuit breaker 104 to trip if other protection operations other than the transient protection operation need to be started. The second data may be an actual average voltage value, an actual average current value, a current imbalance ratio, or the like.
The protection processing thread runs 1 time per cycle T1 (20 ms), relevant data (such as an actual average voltage value, an actual average current value, a current unbalance rate and the like) of other protection functions are calculated according to the effective value calculated by the sampling instantaneous interruption processing thread, after analysis and judgment, corresponding protection actions are executed, the tripping of the circuit breaker is triggered, and judgment processing is carried out and other protection functions (such as long-delay protection, thermal memory overload protection, under-voltage protection, current unbalance protection and the like) except the instantaneous interruption protection are executed.
The protection module 1002 determines whether to perform the undervoltage protection as follows:
1. under-voltage protection: when the voltage in the three-phase distribution line is maximum V max Less than the setting value V of under-voltage protection L The accumulated time is greater than the undervoltage protection action delay time T L Triggering the under-voltage protection, alarming or triggering the tripping and tripping of the circuit breaker, and further protecting the distribution line and the electric equipment.
The method for realizing the undervoltage protection comprises the following steps:
1. sampling instantaneous interruption processing threads, sampling three-phase voltage signals of a distribution line in real time, converting the three-phase voltage signals into digital signals Vadc, taking absolute values Vadc, summing all the Vadc agents of a cycle, and taking an average value to obtain an average voltage value Va of the cycle.
The time of one cycle is T1, T1 is the reciprocal of the alternating current frequency, for example, when the frequency is 50HZ, T1 is 20ms;
the time interval of sampling the three-phase voltage signal in real time is T2, t2=t1/64, for example, when T1 is 20ms, T2 is 0.3125ms;
2. and (3) protecting the processing thread, and converting the average voltage value Va of each cycle into an actual average voltage value Voa=Va x k in real time.
Wherein: k: a voltage conversion coefficient;
the voltage conversion coefficient is set according to the voltage measurement range of the actual circuit and the number of analog-digital conversion bits, for example, the voltage measurement range is 0-100V, and k is 0.04883 when the number of analog-digital conversion bits is 12.
Determining a voltage maximum V max : when the distribution line is three-phase, V max The maximum actual average voltage value Voa in the three phases; when the distribution line is single-phase, V max Is the actual average voltage value Voa.
3. Analyzing, judging and processing data;
firstly, the following parameters are set in the digital power distribution terminal, and the following parameters are set according to the actual power distribution line voltage value, so that the purpose of protecting the power distribution line or electric equipment is achieved.
Setting value V of undervoltage protection L : when the voltage is at maximum V max Below V L For a certain time T L The undervoltage protection is triggered;
under-voltage protection action delay time T L : when the under-voltage time exceeds T L The undervoltage protection is triggered;
under-voltage protection return value V H : if the distribution line is already in an under-voltage condition, then when the voltage is at maximum V max Higher than V H For a certain time T H At the time of under-voltage protection, the voltage is normal, wherein V H ＞V L ；
Under-voltage protection return delay time T H : if the distribution line is already in an under-voltage condition, then when the voltage is at maximum V max Higher than V H And a duration of time greater than T H When the voltage is lower than the threshold, the under-voltage protection is restored, and the voltage is normal;
the under-voltage protection calculation method comprises the following steps: the protection processing thread judges the maximum value V of the voltage once every cycle T1 (20 ms) max If V max Less than the setting value V of under-voltage protection L Starting to accumulate the undervoltage time, otherwise, resetting the undervoltage accumulated time; if the undervoltage accumulated time is greater than the undervoltage protection action delay time T L Triggering the under-voltage protection, and sending a signal to the shunt release or/and the electric operating mechanism by the sampling instantaneous-breaking processing thread, so as to trigger the circuit breaker to trip, cut off the distribution line, realize the under-voltage protection and protect the safety of the distribution line and electric equipment.
When the digital power distribution terminal is already under-voltage protection, the voltage is at maximum V max Is greater than the under-voltage protection return value V H Starting to accumulate the recovery time, otherwise, resetting the recovery accumulated time; if the recovery accumulated time is greater than the under-voltage protection return delay time T H And recovering the distribution line and the electric equipment from the under-voltage state, and releasing the under-voltage protection state.
The protection module 1002 determines whether to perform current imbalance protection as follows:
2. protection against current imbalance: in a three-phase power distribution system, when the split-phase current has a maximum unbalance UB max Greater than the current imbalance protection setting UB H And the duration exceeds the current imbalance protection action delay time T H And triggering current unbalance protection, alarming or triggering a breaker to trip, and further protecting a distribution line and electric equipment.
1. The sampling instant-break processing thread, the real-time sampling current transformer measures the three-phase current signal of the distribution line and simultaneously converts the three-phase current signal into a three-phase digital signal IadcA, iadcB, iadcC, then taking absolute values I < AdcA >, < I < AdcB >, < I < AdcC >, < I > for each phase-separated digital signal, summing the absolute values of each phase-separated of a cycle, and taking the average value to obtain the average current value I of each phase-separated sampling of a cycle ADCA 、I ADCB 、I ADCC 。
The time of one cycle is T1, T1 is the reciprocal of the alternating current frequency, for example, when the frequency is 50HZ, T1 is 20ms;
the time interval for collecting the three-phase current signals in real time is T2, t2=t1/64, for example, when T1 is 20ms, T2 is 0.3125ms;
2. protecting a processing thread, and carrying out real-time sampling on average current value I of each split phase of each cycle ADCA 、I ADCB 、I ADCC The actual average current values Ia, ib and Ic of each phase are converted into:
Ia＝I ADCA *k；
Ib＝I ADCB *k；
Ic＝I ADCC *k；
wherein: k: a current conversion coefficient;
the current conversion coefficient is set according to the current voltage measurement range and the analog-digital conversion bit number of the actual circuit, for example, the current measurement range is 0-100A, and k is 0.04883 when the analog-digital conversion bit number is 12;
the three-phase actual average current values Ia, ib and Ic are averaged to obtain a three-phase average current value I avg ：
I avg ＝(I a +I b +I c )/3
Calculating unbalance ratio UB of each split-phase current a 、UB b 、UB c ：
Imbalance ratio of phase a:
and taking the unbalance rate UB of the three-phase current a 、UB b 、UB c As the maximum value of (2)Current imbalance value UB max As a value for subsequently performing current imbalance judgment;
3. analyzing, judging and processing data;
firstly, the following parameters are set in the digital power distribution terminal, and the following parameters are set according to the actual distribution line load condition, so that the purpose of protecting distribution lines or equipment is achieved.
Current unbalance rate protection setting value UB H : when the current unbalance value UB max Above UB H Indicating that the distribution line is in a current imbalance state;
delay time T of current unbalance protection action H : when the duration of the current imbalance exceeds T H Triggering current unbalance protection and entering a current unbalance protection state;
current imbalance protection return value UB L : when the current unbalance value UB max Less than UB L Indicating that the distribution line is in a current balance state, UB L ＜UB H ；
Current imbalance protection return delay time T L : if the distribution line is already in a current imbalance protection state, then when the current imbalance value UB max In equilibrium for a duration greater than T L When the current unbalance protection is restored;
the current unbalance protection calculation method comprises the following steps: the protection processing thread calculates a current imbalance value UB once every cycle T1 (20 ms) max If UB is max Greater than the current imbalance protection setting UB H Starting to accumulate the time of the current imbalance state, otherwise, resetting the accumulated time of the current imbalance state; if the accumulated time of the current unbalance state is greater than the delay time T of the current unbalance protection action H Triggering current unbalance protection, and sending a signal to a shunt release or/and an electric operating mechanism by a sampling instantaneous-breaking processing thread, so as to trigger a circuit breaker to trip, cut off a distribution line, realize current unbalance protection and protect the safety of the distribution line and electric equipment.
Digital power distribution terminal is already atIn the current imbalance protection, when the current imbalance value UB is max Less than the current imbalance protection return value UB L Starting to accumulate the recovery time, otherwise, resetting the recovery accumulated time; if the recovery accumulated time is greater than the current imbalance protection return delay time T L And recovering the distribution line and the electric equipment from the current unbalance protection state, and releasing the current unbalance protection state.
Optionally, the digital power distribution terminal in this embodiment further includes: the power circuit 112 is used for converting alternating current into direct current and supplying power to each circuit of the digital power distribution terminal.
Optionally, the MCU is connected to a communication interface module 1161 through a communication/power isolation circuit 114. The input/output control circuit 102 is composed of a digital isolation circuit 1020 and a dry-contact input/output circuit 1021, and the digital isolation circuit 1020 is connected with the MCU.
According to the digital power distribution terminal provided in the embodiment, the digital power distribution terminal is connected with a circuit breaker, and the digital power distribution terminal includes: the main control circuit is used for judging whether the power distribution system needs to be protected or not; the input/output control circuit is used for connecting the main control circuit and the circuit breaker and transmitting a control signal of the main control circuit to the circuit breaker; the circuit breaker is controlled by the main control circuit to protect the distribution line and the electric equipment. In one possible embodiment, the master circuit includes: the operation module is used for carrying out operation processing on the sampling data of the digital power distribution terminal and outputting various operation parameters; the protection module is used for judging whether protection operation needs to be started or not according to various operation parameters; and the execution module is used for sending a control signal to the circuit breaker through the input/output control circuit if the protection operation needs to be started, so that the circuit breaker executes the operation corresponding to the control signal. The digital power distribution terminal of the embodiment has the protection and control functions, and the main control circuit controls the circuit breaker to protect the power distribution system, so that the safety and reliability of the power distribution system are improved.
The digital power distribution terminal provided by the embodiment is applied to a power distribution system, can display various operation parameters of the monitored power distribution system, can enable a power distribution cabinet/power distribution box and the like to be free from installing a large number of meters, and saves materials and cost.
The digital power distribution terminal provided by the embodiment also realizes the monitoring and management of various operation parameters of the power distribution system, realizes the functions of parameter analysis, fault analysis, data storage and information display, and enriches the functions of the power distribution system.
Example III
Referring to fig. 3, a flowchart of the steps of a control method of a digital power distribution terminal according to a third embodiment of the present invention is shown.
The control method of the digital power distribution terminal in this embodiment may be implemented by any appropriate terminal device, which is not limited in this embodiment, and this embodiment only uses the digital power distribution terminal as an example for illustration. In this embodiment, digital power distribution terminal is connected with the circuit breaker, and digital power distribution terminal includes: the main control circuit and the input/output control circuit. The input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the main control circuit comprises: and a microprocessor.
The control method of the digital power distribution terminal of the embodiment comprises the following steps:
and step S300, carrying out operation processing on the sampling data of the digital power distribution terminal by adopting a microprocessor, and outputting various operation parameters.
Step S302, judging whether the protection operation needs to be started according to various operation parameters, and executing step S304 if the protection operation needs to be started; if the protection operation does not need to be started, ending the flow.
Step S304, the control signal is sent to the circuit breaker through the input/output control circuit, so that the circuit breaker executes the operation corresponding to the control signal.
According to the control method of the digital power distribution terminal provided by the embodiment, the digital power distribution terminal is connected with the circuit breaker, and the digital power distribution terminal comprises: the main control circuit is used for judging whether the power distribution system needs to be protected or not; the input/output control circuit is used for connecting the main control circuit and the circuit breaker and transmitting a control signal of the main control circuit to the circuit breaker; the circuit breaker is controlled by the main control circuit to protect the distribution line and the electric equipment. In a possible implementation mode, the operation processing is carried out on the sampling data of the digital power distribution terminal, and each operation parameter is output; judging whether a protection operation needs to be started or not according to various operation parameters; if the protection operation is required to be started, the control signal is sent to the circuit breaker through the input/output control circuit, so that the circuit breaker executes the operation corresponding to the control signal. The digital power distribution terminal of the embodiment has the protection and control functions, and the power distribution system is protected by controlling the circuit breaker, so that the safety and reliability of the power distribution system are improved.
Example IV
Referring to fig. 4, a flowchart of the steps of a method for controlling a digital power distribution terminal according to a fourth embodiment of the present invention is shown.
The present embodiment will be described with reference to a digital power distribution terminal. In this embodiment, a digital power distribution terminal is connected with a circuit breaker, the digital power distribution terminal including: the main control circuit and the input/output control circuit. The input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the main control circuit comprises: and a microprocessor.
The control method of the digital power distribution terminal of the embodiment comprises the following steps:
and step 400, carrying out operation processing on the sampling data of the digital power distribution terminal by adopting a microprocessor, and outputting various operation parameters.
Optionally, the operating parameters include: voltage, current, frequency, active power, reactive power, apparent power, power factor, active power indication, reactive power indication, cumulative active power, cumulative reactive power, voltage current harmonic data, current imbalance, voltage imbalance, active maximum demand and time of occurrence, reactive maximum demand and time of occurrence, open-phase data, switching value, residual current, temperature.
Step S402, judging whether the protection operation needs to be started according to various operation parameters, and executing step S404 if the protection operation needs to be started; if the protection operation does not need to be started, ending the flow.
Optionally, the microprocessor comprises: sampling transient interrupt processing thread and protection processing thread.
The step S402 may include the steps of:
step S4020, judging whether instantaneous protection operation needs to be started or not by adopting a sampling instantaneous interruption processing thread according to first data obtained by calculating all operation parameters; if the instantaneous protection operation needs to be started, calling an instantaneous interruption processing protection program to execute the instantaneous protection operation; if the instantaneous protection operation does not need to be started, calculating the effective value of the first data, and sending the effective value to the protection processing thread.
Step S4022, calculating the effective value by adopting a protection processing thread to obtain second data, and judging whether other protection operations except instantaneous protection operations need to be started or not according to the second data; if other protection operations besides the instantaneous protection operation need to be started, triggering the circuit breaker to trip.
Optionally, before calculating the effective value of the first data in step S4020, it may also be determined whether the running number of the sampling instant breaking processing thread reaches a preset number of times, where the preset number of times may be 64.
Optionally, the other protection operations include at least one of: long delay protection operation, thermal memory overload protection operation, under-voltage protection operation, and current imbalance protection operation.
Step S404, the control signal is sent to the circuit breaker through the input/output control circuit, so that the circuit breaker executes the operation corresponding to the control signal.
The control method of the digital power distribution terminal of the present embodiment may adopt the corresponding digital power distribution terminal of the foregoing embodiments as an execution subject, that is, the digital power distribution terminal of the foregoing embodiments executes the control method of the present embodiment, and has the beneficial effects of the corresponding embodiment of the digital power distribution terminal, which is not described herein again.
It should be noted that, according to implementation requirements, each component/step described in the embodiments of the present invention may be split into more components/steps, or two or more components/steps or part of operations of the components/steps may be combined into new components/steps, so as to achieve the objects of the embodiments of the present invention.
Those of ordinary skill in the art will appreciate that the elements and method steps of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present invention.
The above embodiments are only for illustrating the embodiments of the present invention, but not for limiting the embodiments of the present invention, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the embodiments of the present invention, so that all equivalent technical solutions also fall within the scope of the embodiments of the present invention, and the scope of the embodiments of the present invention should be defined by the claims.
Claims (6)
1. A digital power distribution terminal, wherein the digital power distribution terminal is connected with a circuit breaker, the digital power distribution terminal comprising: a main control circuit and an input/output control circuit; the input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the master control circuit includes:
the operation module is used for carrying out operation processing on the sampling data of the digital power distribution terminal and outputting various operation parameters;
the protection module is used for judging whether protection operation needs to be started or not according to the operation parameters;
the execution module is configured to send a control signal to the circuit breaker through the input/output control circuit if a protection operation needs to be started, so that the circuit breaker executes an operation corresponding to the control signal, and the protection module includes: sampling instant-break processing threads and protection processing threads; wherein, the liquid crystal display device comprises a liquid crystal display device,
the sampling instantaneous interruption processing thread is used for judging whether instantaneous protection operation is required to be started according to the first data obtained by calculation of each operation parameter;
the execution module is used for calling an instantaneous interruption processing protection program to execute instantaneous protection operation if instantaneous protection operation needs to be started; if the instantaneous protection operation does not need to be started, calculating the effective value of the first data, and sending the effective value to the protection processing thread;
the protection processing thread is used for calculating second data according to the effective value and judging whether other protection operations except the instantaneous protection operation need to be started or not according to the second data;
and the execution module is used for triggering the circuit breaker to trip if other protection operations except the instantaneous protection operation need to be started. The execution module is used for judging whether the running times of the sampling instant-break processing thread reach the preset times before calculating the effective value of the first data, if the running times of the sampling instant-break processing thread reach the preset times, the effective value of the first data is calculated, the protection processing thread is informed, and judgment processing of other protections except for instant-break protection is carried out.
2. The digital power distribution terminal of claim 1, wherein the other protection operations include at least one of: long delay protection operation, thermal memory overload protection operation, under-voltage protection operation, and current imbalance protection operation.
3. The digital power distribution terminal of any of claims 1 or 2, wherein the operating parameters include: voltage, current, frequency, active power, reactive power, apparent power, power factor, active power indication, reactive power indication, cumulative active power, cumulative reactive power, voltage current harmonic data, current imbalance, voltage imbalance, active maximum demand and time of occurrence, reactive maximum demand and time of occurrence, open-phase data, switching value, residual current, temperature.
4. A control method of a digital power distribution terminal, wherein the digital power distribution terminal is connected with a circuit breaker, the digital power distribution terminal comprising: a main control circuit and an input/output control circuit; the input/output control circuit is respectively connected with the main control circuit and the circuit breaker; the master control circuit includes: a microprocessor;
the microprocessor is adopted to carry out operation processing on the sampling data of the digital power distribution terminal, and each operation parameter is output;
judging whether a protection operation needs to be started or not according to the operation parameters;
if a protection operation is required to be started, a control signal is sent to the circuit breaker through the input/output control circuit, so that the circuit breaker executes an operation corresponding to the control signal, and the microprocessor comprises: sampling instant-break processing threads and protection processing threads;
judging whether the protection operation needs to be started according to the operation parameters comprises the following steps:
judging whether instantaneous protection operation needs to be started or not by adopting the sampling instantaneous interruption processing thread according to first data obtained by calculating the operation parameters;
if the instantaneous protection operation needs to be started, calling an instantaneous interruption processing protection program to execute the instantaneous protection operation; if the instantaneous protection operation does not need to be started, calculating the effective value of the first data, and sending the effective value to the protection processing thread;
calculating the effective value by adopting the protection processing thread to obtain second data, and judging whether other protection operations except the instantaneous protection operation need to be started or not according to the second data;
and triggering the tripping and tripping of the circuit breaker if other protection operations except the instantaneous protection operation need to be started. Before calculating the valid value of the first data, the method further comprises:
judging whether the operation times of the sampling instant break processing thread reach the preset times, if the continuous operation of the preset times does not trigger the instant protection program, calculating the effective value of the first data, informing the protection processing thread, and carrying out judgment processing of other protections except the instant break protection.
5. The method of claim 4, wherein the other protection operations comprise at least one of: long delay protection operation, thermal memory overload protection operation, under-voltage protection operation, and current imbalance protection operation.
6. The method of any one of claims 4 or 5, wherein the operating parameters include: voltage, current, frequency, active power, reactive power, apparent power, power factor, active power indication, reactive power indication, cumulative active power, cumulative reactive power, voltage current harmonic data, current imbalance, voltage imbalance, active maximum demand and time of occurrence, reactive maximum demand and time of occurrence, open-phase data, switching value, residual current, temperature.
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| CN201611260101.8A CN108270285B (en) | 2016-12-30 | 2016-12-30 | Digital power distribution terminal and control method thereof |
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| CN201611260101.8A CN108270285B (en) | 2016-12-30 | 2016-12-30 | Digital power distribution terminal and control method thereof |
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