A method, device and equipment for judging bus interconnection

Abstract

The present invention provides a method, device and equipment for discriminating bus interconnection. By detecting the closing state of the circuit breaker in the bus-coupling interval of the primary system with double-bus connection, the acquisition result of the current transformer, the closing state of the disconnector, as well as the acquisition result of the current transformer and the closing state of the disconnector in the intervals of the primary system with double-bus connection, and then judging whether the detection result meets the preset interconnection state logic, the adaptive switching-on and switching-off of the bus interconnection operating state is realized based on the judgment result, so as to improve the reliability of double-bus switching, save manpower, reduce working hours and improve labor efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of power detection, and particularly relates to a method, device and equipment for discriminating bus interconnection. Background Art

[0002] During the double-bus switching operation, when the auxiliary contacts of the isolators of both the I bus and the II bus of the same unit are closed simultaneously, the double buses are in the interconnected mode, which is called the "interconnected state" of the buses. During the double-bus switching operation, it is necessary to put into the "interconnected operation" pressure plate of the bus protection. In the interconnected state, the bus protection device regards the "I bus and II bus" as a single-bus operation mode, and the bus protection is only composed of the large differential, and the two small differentials do not work. At this time, no matter whether a fault occurs on the I bus or the II bus, the large differential will act to cut off all the connected units on both buses. The patent of "Bus Interconnection Adaptive Switching Circuit and Switching Control System" (CN207442445U) proposes to realize the adaptive switching of bus interconnection during the switching process by discriminating the states of the working bus isolator and the standby bus isolator corresponding to each interval.

[0003] However, the following problems are found in the on-site work process:

[0004] Currently, during the double-bus switching operation, it is necessary for the operation and maintenance personnel to manually switch the "interconnected operation" pressure plate of the bus protection device, which has a large workload, increases the switching operation time, and is overly dependent on the work ability of the operation and maintenance personnel. If the "interconnected operation" pressure plate is not put in before switching or not withdrawn after switching is completed, it may cause misoperation of the bus differential protection.

[0005] The auxiliary contacts of the isolators are easily damaged. Only relying on the positions of the isolators of each interval to realize the adaptive switching of bus interconnection during the switching process. If the auxiliary contacts of the isolators are damaged, the bus differential protection cannot identify whether the double buses are in the interconnected state. At this time, if a fault occurs on the bus, the bus differential protection will misoperate and damage the stability of the power grid. Summary of the Invention

[0006] In view of this, the embodiments of the present invention provide a method, device and equipment for discriminating bus interconnection to realize the adaptive switching of the interconnected operation state of the buses.

[0007] To achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0008] A method for discriminating bus interconnection includes:

[0009] Obtaining the closing state of the three-phase normally open auxiliary contacts connected in series in the circuit breaker of the bus-coupling interval in the primary side system of the double-bus connection, and recording it as the first closing state;

[0010] Obtaining the closing state of the isolator on the first bus side in the primary side system of the double-bus connection, and recording it as the second closing state;

[0011] Acquire the closing state of the isolating switch on the second bus side of the double-bus connection primary side system, and record it as the third closing state;

[0012] Obtaining a current value detected by a current transformer of a phase A in a busbar bay in the primary side system of the double busbar connection, and recording it as a first current value;

[0013] Acquire the closing state of the disconnector on the first bus side in the interval in the primary side system of the double bus connection, and record it as the fourth closing state;

[0014] Acquire the closing state of the disconnector on the second bus side in the interval in the primary side system of the double bus connection, and record it as the fifth closing state;

[0015] Obtaining a current value detected by a current transformer on the first bus side in a bay in the primary side system of the double bus connection, and recording it as a second current value;

[0016] Obtaining a current value detected by a current transformer on the second bus side in a bay in the primary side system of the double bus connection, and recording it as a third current value;

[0017] Determine whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic; if so, control the bus differential protection to enter the interconnection state; otherwise, control the bus protection device to release the bus interconnection operation state.

[0018] Optionally, in the above busbar interconnection determination method, judging whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value satisfy a preset interconnection state logic includes:

[0019] Determine whether the first closing state, the second closing state, the third closing state and the first current value meet a first preset condition;

[0020] Determining whether the fourth closing state, the fifth closing state, the second current value, and the third current value meet a second preset condition;

[0021] When the first preset condition and the second preset condition are met, it indicates that the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic;

[0022] The first preset condition is:

[0023] The first closing state, the second closing state, and the third closing state are the first state, or the first current value is greater than 0, and the first state is the closing state;

[0024] The second preset condition is:

[0025] The fourth closing state and the fifth closing state are the first preset state, or both the second current value and the third current value are greater than 0.

[0026] Optionally, in the above bus interconnection discrimination method, when there are n intervals in the primary side system of the double-bus connection, where n is a positive integer not less than 1, obtaining the closing state of the disconnector on the first bus side in the intervals of the primary side system of the double-bus connection, denoted as the fourth closing state; obtaining the closing state of the disconnector on the second bus side in the intervals of the primary side system of the double-bus connection, denoted as the fifth closing state; obtaining the current value detected by the current transformer on the first bus side in the intervals of the primary side system of the double-bus connection, denoted as the second current value; obtaining the current value detected by the current transformer on the second bus side in the intervals of the primary side system of the double-bus connection, denoted as the third current value, includes:

[0027] Obtaining the closing state of the disconnector on the first bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the fourth closing state of the i-th interval, where i is a positive integer not greater than n;

[0028] Obtaining the closing state of the disconnector on the second bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the fifth closing state of the i-th interval;

[0029] Obtaining the current value detected by the current transformer on the first bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the second current value of the i-th interval;

[0030] Obtaining the current value detected by the current transformer on the second bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the third current value of the i-th interval.

[0031] Optionally, in the above bus interconnection discrimination method, determining whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value, and the third current value satisfy a preset interconnection state logic includes:

[0032] Determining whether the combination of the first closing state, the second closing state, the third closing state, and the first current value and the fourth closing state, the fifth closing state, the second current value, and the third current value of any one interval satisfies the preset interconnection state logic.

[0033] Optionally, in the above bus interconnection discrimination method, the normally open auxiliary contacts of the three phases of the circuit breaker in the bus-coupling bay of the primary side system with double busbar connection are input into the first input of the bus protection device. Obtaining the closing state of the normally open auxiliary contacts of the three phases connected in series in the circuit breaker in the bus-coupling bay of the primary side system with double busbar connection includes: detecting the energized state of the first input of the bus protection device;

[0034] The normally open auxiliary contacts of the isolator on the first bus side of the primary side system with double busbar connection are input into the second input of the bus protection device. Obtaining the closing state of the isolator on the first bus side of the primary side system with double busbar connection includes: detecting the energized state of the second input of the bus protection device;

[0035] The normally open auxiliary contacts of the isolator on the second bus side of the primary side system with double busbar connection are input into the third input of the bus protection device. Obtaining the closing state of the isolator on the second bus side of the primary side system with double busbar connection includes: detecting the energized state of the third input of the bus protection device;

[0036] The normally open auxiliary contacts of the isolator on the first bus side of the bay in the primary side system with double busbar connection are input into the fourth input of the bus protection device. Obtaining the closing state of the isolator on the first bus side of the bay in the primary side system with double busbar connection includes: detecting the energized state of the fourth input of the bus protection device;

[0037] The normally open auxiliary contacts of the isolator on the second bus side of the bay in the primary side system with double busbar connection are input into the fifth input of the bus protection device. Obtaining the closing state of the isolator on the second bus side of the bay in the primary side system with double busbar connection includes: detecting the energized state of the fifth input of the bus protection device.

[0038] A bus interconnection discrimination device includes:

[0039] A closing state acquisition unit is configured to obtain the closing state of the normally open auxiliary contacts of the three phases connected in series in the circuit breaker in the bus-coupling bay of the primary side system with double busbar connection, denoted as the first closing state; obtain the closing state of the isolator on the first bus side of the primary side system with double busbar connection, denoted as the second closing state; obtain the closing state of the isolator on the second bus side of the primary side system with double busbar connection, denoted as the third closing state; obtain the closing state of the isolator on the first bus side of the bay in the primary side system with double busbar connection, denoted as the fourth closing state; obtain the closing state of the isolator on the second bus side of the bay in the primary side system with double busbar connection, denoted as the fifth closing state;

[0040] A current state acquisition unit is used to obtain the current value detected by the A-phase current transformer of the busbar interval in the double-busbar wiring primary side system, which is recorded as the first current value; obtain the current value detected by the current transformer on the first busbar side in the interval in the double-busbar wiring primary side system, which is recorded as the second current value; obtain the current value detected by the current transformer on the second busbar side in the interval in the double-busbar wiring primary side system, which is recorded as the third current value;

[0041] A logic judgment unit is used to judge whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic. If so, the bus differential protection is controlled to enter the interconnection state; otherwise, the bus protection device is controlled to release the bus interconnection operation state.

[0042] Optionally, in the above-mentioned bus interconnection determination device, when the logic judgment unit judges whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic, it is specifically used to:

[0043] Determine whether the first closing state, the second closing state, the third closing state and the first current value meet a first preset condition;

[0044] Determining whether the fourth closing state, the fifth closing state, the second current value, and the third current value meet a second preset condition;

[0045] When the first preset condition and the second preset condition are met, it indicates that the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic;

[0046] The first preset condition is:

[0047] The first closing state, the second closing state and the third closing state are the first state, or the first current value is greater than 0, and the first state is the closing state;

[0048] The second preset condition is:

[0049] The fourth closing state and the fifth closing state are the first preset state, or the second current value and the third current value are both greater than 0.

[0050] Optionally, in the above busbar interconnection determination device, when the double busbar connection primary side system includes n bays, n is a positive integer not less than 1,

[0051] The closing state acquisition unit is specifically configured to:

[0052] Obtain the closing state of the disconnector on the first bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the fourth closing state of the i-th interval, where i is a positive integer not greater than n;

[0053] Obtain the closing state of the disconnector on the second bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the fifth closing state of the i-th interval;

[0054] The current state acquisition unit is specifically configured to:

[0055] Obtain the current value detected by the current transformer on the first bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the second current value of the i-th interval;

[0056] Obtain the current value detected by the current transformer on the second bus side in the i-th interval of the primary side system of the double-bus connection, denoted as the third current value of the i-th interval.

[0057] Optionally, in the above bus interconnection discrimination device, when the logic judgment unit determines whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value, and the third current value satisfy the preset interconnection state logic, it is specifically configured to:

[0058] Determine whether the combination of the first closing state, the second closing state, the third closing state, and the first current value and the fourth closing state, the fifth closing state, the second current value, and the third current value of any one interval satisfies the preset interconnection state logic.

[0059] A bus interconnection discrimination device includes:

[0060] A bus protection device;

[0061] The normally open auxiliary contacts of the three phases of the circuit breaker in the bus-coupling interval of the primary side system of the double-bus connection are input into the first input of the bus protection device;

[0062] The normally open auxiliary contacts of the disconnector on the first bus side of the primary side system of the double-bus connection are input into the second input of the bus protection device;

[0063] The normally open auxiliary contacts of the disconnector on the second bus side of the primary side system of the double-bus connection are input into the third input of the bus protection device;

[0064] The normally open auxiliary contacts of the disconnector on the first bus side in the interval of the primary side system of the double-bus connection are input into the fourth input of the bus protection device;

[0065] The normally open auxiliary contact of the disconnector on the second bus side in the interval of the primary side system with double busbar connection is input into the fifth input of the bus protection device;

[0066] It further includes the bus interconnection discrimination device described in any one of the above;

[0067] When the bus interconnection discrimination device obtains the closing state of the three-phase normally open auxiliary contacts connected in series in the circuit breaker of the bus coupler interval in the primary side system with double busbar connection, specifically: detecting the energized state of the first input of the bus protection device

[0068] When the bus interconnection discrimination device obtains the closing state of the disconnector on the first bus side in the primary side system with double busbar connection, specifically: detecting the energized state of the second input of the bus protection device;

[0069] When the bus interconnection discrimination device obtains the closing state of the disconnector on the second bus side in the primary side system with double busbar connection, specifically: detecting the energized state of the third input of the bus protection device;

[0070] When the bus interconnection discrimination device obtains the closing state of the disconnector on the first bus side in the interval of the primary side system with double busbar connection, specifically: detecting the energized state of the fourth input of the bus protection device;

[0071] When the bus interconnection discrimination device obtains the closing state of the disconnector on the second bus side in the interval of the primary side system with double busbar connection, specifically: detecting the energized state of the fifth input of the bus protection device.

[0072] Based on the above technical solutions, the above solutions provided in the embodiments of the present invention detect the closing state of the circuit breaker in the bus coupler interval of the primary system with double busbar connection, the acquisition result of the current transformer, the closing state of the disconnector, and the acquisition result of the current transformer and the closing state of the disconnector in the interval of the primary system with double busbar connection, and then judge whether the detection result meets the preset interconnection state logic. Based on the judgment result, the adaptive switching of the bus interconnection operation state is realized, the reliability of the double busbar switching is improved, manpower is saved, working hours are reduced, and labor efficiency is improved. Description of the Drawings

[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0074] Figure 1It is a circuit diagram of the primary side system with double busbar connection.

[0075] Figure 2 It is a schematic flow diagram of the busbar interconnection discrimination method disclosed in the embodiment of the present application.

[0076] Figure 3 It is a schematic diagram of busbar interconnection discrimination logic.

[0077] Figure 4 It is a schematic diagram of digital input.

[0078] Figure 5 It is a schematic structural diagram of the busbar interconnection discrimination device disclosed in the embodiment of the present application. Detailed implementation manners

[0079] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0080] Figure 1 It is a circuit diagram of the primary side system with double busbar connection. Refer to Figure 1 , the primary side system with double busbar connection includes:

[0081] DS01: Disconnecting switch on the side of the bus-coupling bay close to Bus I. In this solution, Bus I is denoted as the first busbar.

[0082] DS02: Disconnecting switch on the side of the bus-coupling bay close to Bus II. In this solution, Bus II is denoted as the first busbar.

[0083] CT0: Phase-A current transformer of the bus-coupling bay.

[0084] DL0: Circuit breaker of the bus-coupling bay.

[0085] DS11, DS21, DSn1: Disconnecting switches on the side of Bay 1, Bay 2, Bay n close to Bus I.

[0086] DS12, DS22, DSn2: Disconnecting switches on the side of Bay 1, Bay 2, Bay n close to Bus II.

[0087] CT11, CT21, CTn1: Phase-A current transformers on the side of Bay 1, Bay 2, Bay n close to DS11, DS21, DSn1.

[0088] CT12, CT22, CTn2: Phase-A current transformers on the side of Bay 1, Bay 2, Bay n close to DS12, DS22, DSn2.

[0089] DL1, DL2, DLn: Circuit breakers for intervals 1, 2, …, n.

[0090] See Figure 2 , in this solution, the disclosed bus interconnection discrimination method may include:

[0091] Step S101: Obtain the closing state of the three normally open auxiliary contacts connected in series in the circuit breaker of the bus coupler interval in the primary side system of the double-bus connection, denoted as the first closing state.

[0092] The three-phase switches of the circuit breaker of the bus coupler interval are connected in series, and its form is like Figure 2 the connection mode of DL0a normally open, DL0b normally open, and DL0c normally open in, and the closing state of the three normally open auxiliary contacts refers to the closing states of these three normally open contacts. Only when all these three normally open contacts are in the closed state, it indicates that the three normally open auxiliary contacts of the circuit breaker of the bus coupler interval are in the closed state.

[0093] Step S102: Obtain the closing state of the disconnector on the first bus side in the primary side system of the double-bus connection, denoted as the second closing state;

[0094] When the disconnector on the first bus side in the primary side system of the double-bus connection is in the closed state, the circuit breaker of the bus coupler interval is electrically connected to the first bus;

[0095] Step S103: Obtain the closing state of the disconnector on the second bus side in the primary side system of the double-bus connection, denoted as the third closing state;

[0096] When the disconnector on the second bus side in the primary side system of the double-bus connection is in the closed state, the circuit breaker of the bus coupler interval is electrically connected to the second bus;

[0097] Step S104: Obtain the current value detected by the phase A current transformer in the bus coupler interval in the primary side system of the double-bus connection, denoted as the first current value;

[0098] The phase A current transformer CT0 in the bus coupler interval is used to collect the current value between the first bus or the second bus and the circuit breaker of the bus coupler interval. In this solution, the phase A current transformer CT0 in the bus coupler interval can transform the collected primary current into a secondary value and access the bus protection device through the secondary circuit. The current value of the phase A current transformer in the bus coupler interval can be read through the bus protection device, and this current value is denoted as current I0, and I0 is the first current value.

[0099] Step S105: Obtain the closing state of the disconnector on the first bus side in the interval in the primary side system of the double-bus connection, denoted as the fourth closing state;

[0100] The disconnecting switch on the first bus side in the said interval refers to Figure 1 the disconnecting switches DS11, DS21... DSn1 in [reference], when there is only one interval in the primary side system of the double-bus connection, the disconnecting switch on the first bus side refers to the disconnecting switch connected to the first bus in this interval.

[0101] Step S106: Obtain the closing state of the disconnecting switch on the second bus side in the interval of the primary side system of the double-bus connection, denoted as the fifth closing state;

[0102] The disconnecting switch on the second bus side in the said interval refers to Figure 1 the disconnecting switches DS12, DS22... DSn2 in [reference], when there is only one interval in the primary side system of the double-bus connection, the disconnecting switch on the second bus side refers to the disconnecting switch connected to the second bus in this interval.

[0103] Step S107: Obtain the current value detected by the current transformer on the first bus side in the interval of the primary side system of the double-bus connection, denoted as the second current value;

[0104] The current transformer on the first bus side in the said interval refers to the current transformer connected to the first bus through a disconnecting switch in the interval. For example, Figure 1 the current transformers CT11, CT21... CTn1 in [reference], the current transformers CT11, CT21... CTn1 can transform the collected primary current into a secondary value and access the bus protection device through the secondary circuit. The current value detected by the current transformer on the first bus side in the said interval can be read through the bus protection device, and this current value is denoted as current I1, and I1 is the second current value.

[0105] Step S108: Obtain the current value detected by the current transformer on the second bus side in the interval of the primary side system of the double-bus connection, denoted as the third current value;

[0106] The current transformer on the second bus side in the said interval refers to the current transformer connected to the second bus through a disconnecting switch in the interval. For example, Figure 1 the current transformers CT12, CT22... CTn2 in [reference], the current transformers CT12, CT22... CTn2 can transform the collected primary current into a secondary value and access the bus protection device through the secondary circuit. The current value detected by the current transformer on the second bus side in the said interval can be read through the bus protection device, and this current value is denoted as current I2.

[0107] Step S109: determining whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic; if so, executing step S110; otherwise, executing step S111;

[0108] In this scheme, an interconnection state logic is pre-configured. After obtaining the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value, it is determined whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value satisfy the logic. If the logic is satisfied, it indicates that the bus interconnection operation input conditions are met; otherwise, it indicates that the bus interconnection operation input conditions are not met.

[0109] Step S110: Control the bus differential protection to enter the interconnected state.

[0110] When the interconnection state logic is met, the busbar protection device automatically enters the busbar interconnection operation state, and the busbar differential protection enters the interconnection state.

[0111] Step S111: controlling the busbar protection device to release the busbar interconnection operation state;

[0112] When the interconnection status logic is not met, the busbar protection device automatically releases the busbar interconnection operation status.

[0113] In this scheme, by detecting the closing state of the circuit breaker of the busbar interval in the double-busbar wiring primary system, the current transformer acquisition results, the closing state of the disconnector, and the current transformer acquisition results of the interval in the double-busbar wiring primary system, and the closing state of the disconnector, and then judging whether the detection result meets the preset interconnection state logic, the adaptive investment and withdrawal of the busbar interconnection operation state is realized based on the judgment result, thereby improving the reliability of double-busbar switching, saving manpower, reducing working hours, and improving labor efficiency.

[0114] Specifically, the present application also discloses the specific content of judging whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic. Specifically, the process includes:

[0115] Determining whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value, and the third current value satisfy a preset interconnection state logic includes:

[0116] Determine whether the first closing state, the second closing state, the third closing state, and the first current value satisfy a first preset condition;

[0117] Determine whether the fourth closing state, the fifth closing state, the second current value, and the third current value satisfy a second preset condition;

[0118] When the first preset condition and the second preset condition are satisfied, it indicates that the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value, and the third current value satisfy a preset interconnection state logic;

[0119] The first preset condition is:

[0120] The first closing state, the second closing state, and the third closing state are in a first state, or the first current value is greater than 0, and the first state is a closing state;

[0121] The second preset condition is:

[0122] The fourth closing state and the fifth closing state are in a first preset state, or both the second current value and the third current value are greater than 0.

[0123] Specifically, refer to Figure 3 , the first preset condition is: the first closing state, the second closing state, and the third closing state are all closed, or the first current value I0 is greater than or equal to Idz, and the Idz is a current threshold value, which can be understood as 0 or a value close to 0.

[0124] Refer to Figure 3 , the second preset condition is: the fourth closing state and the fifth closing state are both closed, or both the second current value I1 and the third current value I2 are greater than or equal to Idz;

[0125] When the first preset condition and the second preset condition are simultaneously satisfied, it indicates that interconnection operation can be performed.

[0126] In an actual scenario, the primary side system of a double-busbar connection can include n intervals, where n is a positive integer not less than 1. At this time, in the above method, when collecting the fourth closing state, the fifth closing state, the second current value, and the third current value, the specific scheme is:

[0127] Obtain the closing state of the disconnector on the first bus side in the i-th interval of the primary side system of the double-busbar connection, denoted as the fourth closing state of the i-th interval, where i is a positive integer not greater than n;

[0128] Obtain the closing state of the disconnector on the second bus side in the i-th interval of the primary side system of the double-busbar connection, denoted as the fifth closing state of the i-th interval;

[0129] Obtain the current value detected by the current transformer on the first bus side in the i-th interval of the primary side system of the double-bus connection, and record it as the second current value of the i-th interval;

[0130] Obtain the current value detected by the current transformer on the second bus side in the i-th interval of the primary side system of the double-bus connection, and record it as the third current value of the i-th interval.

[0131] When the primary side system of the double-bus connection includes n intervals, and the fourth closing state, fifth closing state, second current value, and third current value corresponding to the n intervals are obtained, in the above method, determining whether the first closing state, second closing state, third closing state, fourth closing state, fifth closing state, first current value, second current value, and third current value satisfy the preset interconnection state logic includes: determining whether the combination of the first closing state, second closing state, third closing state, and first current value and the fourth closing state, fifth closing state, second current value, and third current value of any one interval satisfies the preset interconnection state logic. That is, the combination of the fourth closing state, fifth closing state, second current value, and third current value corresponding to any one interval and the first closing state, second closing state, third closing state, and first current value satisfies the preset interconnection state logic, which indicates that the primary side system of the double-bus connection satisfies the bus interconnection operation state.

[0132] In the technical solution disclosed in the above embodiments of the present application, in order to achieve rapid detection of the closing state and current value, in this solution, the corresponding detection nodes can be input into the bus protection device, and by detecting the values of each input of the bus protection device, the closing state and current value of the corresponding nodes in the primary system of the double-bus connection can be detected. For example, see Figure 4, the normally open auxiliary contacts of the three phases of the circuit breaker in the bus-coupling bay of the primary side system with double busbar connection are input to the first input 01 of the bus protection device. Obtaining the closing state of the normally open auxiliary contacts of the three phases connected in series in the circuit breaker in the bus-coupling bay of the primary side system with double busbar connection includes: detecting the energized state of the first input of the bus protection device; the normally open auxiliary contacts of the disconnector on the first bus side of the primary side system with double busbar connection are input to the second input 02 of the bus protection device. Obtaining the closing state of the disconnector on the first bus side of the primary side system with double busbar connection includes: detecting the energized state of the second input of the bus protection device; the normally open auxiliary contacts of the disconnector on the second bus side of the primary side system with double busbar connection are input to the third input 03 of the bus protection device. Obtaining the closing state of the disconnector on the second bus side of the primary side system with double busbar connection includes: detecting the energized state of the third input of the bus protection device; the normally open auxiliary contacts of the disconnector on the first bus side of the bay in the primary side system with double busbar connection are input to the fourth input 04 of the bus protection device. Obtaining the closing state of the disconnector on the first bus side of the bay in the primary side system with double busbar connection includes: detecting the energized state of the fourth input of the bus protection device; the normally open auxiliary contacts of the disconnector on the second bus side of the bay in the primary side system with double busbar connection are input to the fifth input 05 of the bus protection device. Obtaining the closing state of the disconnector on the second bus side of the bay in the primary side system with double busbar connection includes: detecting the energized state of the fifth input of the bus protection device.

[0133] The output terminal of the phase A current transformer in the bus-coupling bay is input to the sixth input of the bus protection device. Obtaining the current value detected by the phase A current transformer in the bus-coupling bay of the primary side system with double busbar connection is specifically: obtaining the current value detected by the phase A current transformer in the bus-coupling bay by detecting the sixth input. Obtaining the current value detected by the current transformer on the first bus side of the bay in the primary side system with double busbar connection, where the current transformer on the first bus side of the bay in the primary side system with double busbar connection is input to the seventh input of the bus protection device, is specifically: obtaining the current value detected by the current transformer on the first bus side of the bay in the primary side system with double busbar connection by detecting the seventh input. The current transformer on the second bus side of the bay in the primary side system with double busbar connection is input to the eighth input of the bus protection device. Obtaining the current value detected by the current transformer on the second bus side of the bay in the primary side system with double busbar connection is specifically: obtaining the current value detected by the current transformer on the second bus side of the bay in the primary side system with double busbar connection through the eighth input.

[0134] In this embodiment, corresponding to the above method, the present application also discloses a busbar interconnection determination device. For the specific working contents of each unit in the device, please refer to the contents of the above method embodiment.

[0135] The bus interconnection determination device provided in an embodiment of the present invention is described below. The bus interconnection determination device described below and the bus interconnection determination method described above can be referenced to each other.

[0136] See also Figure 5 The busbar interconnection determination device may include: a closing state acquisition unit A, a current state acquisition unit B and a logic judgment unit C.

[0137] The closing state acquisition unit A corresponds to the above method, and is used to obtain the closing state of the three-phase normally open auxiliary contacts connected in series in the bus tie interval circuit breaker in the double bus connection primary side system, which is recorded as the first closing state; obtain the closing state of the disconnector on the first bus side of the double bus connection primary side system, which is recorded as the second closing state; obtain the closing state of the disconnector on the second bus side of the double bus connection primary side system, which is recorded as the third closing state; obtain the closing state of the disconnector on the first bus side in the interval in the double bus connection primary side system, which is recorded as the fourth closing state; obtain the closing state of the disconnector on the second bus side in the interval in the double bus connection primary side system, which is recorded as the fifth closing state;

[0138] The current state acquisition unit B corresponds to the above method, and is used to obtain the current value detected by the current transformer of the A phase of the busbar interval in the double-busbar wiring primary side system, which is recorded as the first current value; obtain the current value detected by the current transformer on the first busbar side in the interval in the double-busbar wiring primary side system, which is recorded as the second current value; obtain the current value detected by the current transformer on the second busbar side in the interval in the double-busbar wiring primary side system, which is recorded as the third current value;

[0139] The logic judgment unit C corresponds to the above method, and is used to judge whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic. If so, the bus differential protection is controlled to enter the interconnection state; otherwise, the bus protection device is controlled to release the bus interconnection operation state.

[0140] Corresponding to the above method, when the logic judgment unit judges whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic, it is specifically used to:

[0141] Determine whether the first closing state, the second closing state, the third closing state, and the first current value satisfy a first preset condition;

[0142] Determine whether the fourth closing state, the fifth closing state, the second current value, and the third current value satisfy a second preset condition;

[0143] When the first preset condition and the second preset condition are satisfied, it indicates that the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value, and the third current value satisfy the preset interconnection state logic;

[0144] The first preset condition is:

[0145] The first closing state, the second closing state, and the third closing state are in a first state, or the first current value is greater than 0, and the first state is the closing state;

[0146] The second preset condition is:

[0147] The fourth closing state and the fifth closing state are in a first preset state, or both the second current value and the third current value are greater than 0.

[0148] Corresponding to the above method, when the double-busbar connection primary-side system includes n intervals, where n is a positive integer not less than 1,

[0149] The closing state acquisition unit is specifically used for:

[0150] Obtain the closing state of the disconnecting switch on the first bus side in the i-th interval of the double-busbar connection primary-side system, denoted as the fourth closing state of the i-th interval, where i is a positive integer not greater than n;

[0151] Obtain the closing state of the disconnecting switch on the second bus side in the i-th interval of the double-busbar connection primary-side system, denoted as the fifth closing state of the i-th interval;

[0152] The current state acquisition unit is specifically used for:

[0153] Obtain the current value detected by the current transformer on the first bus side in the i-th interval of the double-busbar connection primary-side system, denoted as the second current value of the i-th interval;

[0154] Obtain the current value detected by the current transformer on the second bus side in the i-th interval of the double-busbar connection primary-side system, denoted as the third current value of the i-th interval.

[0155] Corresponding to the above method, when the logic judgment unit determines whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value, and the third current value meet the preset interconnection state logic, it specifically is used for:

[0156] Determine whether the combination of the first closing state, the second closing state, the third closing state, and the first current value and the fourth closing state, the fifth closing state, the second current value, and the third current value of any one interval meets the preset interconnection state logic.

[0157] The present application also discloses a bus interconnection discrimination device, including: a bus protection device and a bus interconnection discrimination device, and the bus interconnection discrimination device can be integrated with the bus protection device or can be independently provided.

[0158] The normally open auxiliary contacts of the three phases of the circuit breaker of the bus-coupling interval in the primary side system of the double-bus connection are input into the first input of the bus protection device;

[0159] The normally open auxiliary contacts of the disconnector on the first bus side in the primary side system of the double-bus connection are input into the second input of the bus protection device;

[0160] The normally open auxiliary contacts of the disconnector on the second bus side in the primary side system of the double-bus connection are input into the third input of the bus protection device;

[0161] The normally open auxiliary contacts of the disconnector on the first bus side in the interval in the primary side system of the double-bus connection are input into the fourth input of the bus protection device;

[0162] The normally open auxiliary contacts of the disconnector on the second bus side in the interval in the primary side system of the double-bus connection are input into the fifth input of the bus protection device;

[0163] When the bus interconnection discrimination device obtains the closing state of the normally open auxiliary contacts in series in the circuit breaker of the bus-coupling interval in the primary side system of the double-bus connection, specifically: detect the energized state of the first input of the bus protection device

[0164] When the bus interconnection discrimination device obtains the closing state of the disconnector on the first bus side in the primary side system of the double-bus connection, specifically: detect the energized state of the second input of the bus protection device;

[0165] When the bus interconnection discrimination device obtains the closing state of the disconnector on the second bus side in the primary side system of the double-bus connection, specifically: detect the energized state of the third input of the bus protection device;

[0166] The bus interconnection discrimination device obtains the closing state of the disconnector on the first bus side in the interval of the primary side system of the double-bus connection, specifically: detecting the energized state of the fourth input of the bus protection device;

[0167] The bus interconnection discrimination device obtains the closing state of the disconnector on the second bus side in the interval of the primary side system of the double-bus connection, specifically: detecting the energized state of the fifth input of the bus protection device.

[0168] For the convenience of description, when describing the above system, various modules are described separately according to function c. Of course, when implementing the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0169] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments. In particular, for the system or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments. The systems and system embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0170] Professionals can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but this implementation should not be considered to exceed the scope of the present invention.

[0171] The steps of the method or algorithm described in combination with the embodiments disclosed in this article can be directly implemented by hardware, a software module executed by a processor, or a combination of the two. The software module can be placed in a random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0172] It should also be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0173] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for discriminating bus interconnection, characterized in that, include: Obtain the closing state of the three-phase normally open auxiliary contacts connected in series in the busbar interval circuit breaker in the double-busbar connection primary side system, which is recorded as the first closing state; Acquire the closing state of the disconnector on the first bus side of the double-bus connection primary side system, and record it as the second closing state; Acquire the closing state of the isolating switch on the second bus side of the double-bus connection primary side system, and record it as the third closing state; Obtaining a current value detected by a phase A current transformer in a busbar interval in the primary side system of the double busbar connection, recorded as a first current value; obtaining a closing state of a disconnector on the first busbar side in a bay in the primary side system of the double busbar connection, recorded as a fourth closing state; Acquire the closing state of the disconnector on the second bus side in the interval in the primary side system of the double bus connection, and record it as the fifth closing state; Obtaining a current value detected by a current transformer on the first bus side in a bay in the primary side system of the double bus connection, and recording it as a second current value; Obtaining a current value detected by a current transformer on the second bus side in the interval in the primary side system of the double bus connection, recorded as a third current value; judging whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value satisfy a preset interconnection state logic; if so, controlling the bus differential protection to enter an interconnection state; otherwise, controlling the bus protection device to release the bus interconnection operation state; Interconnection state logic, including: Determine whether the first closing state, the second closing state, the third closing state and the first current value meet a first preset condition; Determining whether the fourth closing state, the fifth closing state, the second current value, and the third current value meet a second preset condition; When the first preset condition and the second preset condition are met, it indicates that the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic; The first preset condition is: The first closing state, the second closing state and the third closing state are the first state, or the first current value is greater than 0, and the first state is the closing state; The second preset condition is: The fourth closing state and the fifth closing state are the first preset state, or the second current value and the third current value are both greater than 0; Wherein, when the double busbar connection primary side system includes n intervals, n is a positive integer not less than 1, and obtaining the fourth closing state, the fifth closing state, the second current value and the third current value includes: Obtaining the closing state of the disconnector on the first bus side in the i-th interval of the double-bus connection primary side system, recorded as the fourth closing state of the i-th interval, where i is a positive integer not greater than n; Obtaining the closing state of the disconnector on the second bus side in the i-th bay of the double-bus connection primary side system, recorded as the fifth closing state of the i-th bay; Obtaining a current value detected by a current transformer on the first bus side in an i-th interval in the double-bus connection primary side system, and recording it as a second current value of the i-th interval; Obtain the current value detected by the current transformer on the second bus side in the i-th interval of the primary side system of the double-bus connection, and denote it as the third current value of the i-th interval.

2. The busbar interconnection discrimination method according to claim 1, characterized in that The three normally open auxiliary contacts of the circuit breaker in the bus-coupling interval of the primary side system of the double-bus connection are input into the first input of the bus protection device. The obtaining of the closing state of the three normally open auxiliary contacts connected in series in the circuit breaker in the bus-coupling interval of the primary side system of the double-bus connection includes: detecting the energized state of the first input of the bus protection device; The normally open auxiliary contact of the disconnecting switch on the first bus side of the primary side system of the double-bus connection is input into the second input of the bus protection device. The obtaining of the closing state of the disconnecting switch on the first bus side of the primary side system of the double-bus connection includes: detecting the energized state of the second input of the bus protection device; The normally open auxiliary contact of the disconnecting switch on the second bus side of the primary side system of the double-bus connection is input into the third input of the bus protection device. The obtaining of the closing state of the disconnecting switch on the second bus side of the primary side system of the double-bus connection includes: detecting the energized state of the third input of the bus protection device; The normally open auxiliary contact of the disconnecting switch on the first bus side in the interval of the primary side system of the double-bus connection is input into the fourth input of the bus protection device. The obtaining of the closing state of the disconnecting switch on the first bus side in the interval of the primary side system of the double-bus connection includes: detecting the energized state of the fourth input of the bus protection device; The normally open auxiliary contact of the disconnecting switch on the second bus side in the interval of the primary side system of the double-bus connection is input into the fifth input of the bus protection device. The obtaining of the closing state of the disconnecting switch on the second bus side in the interval of the primary side system of the double-bus connection includes: detecting the energized state of the fifth input of the bus protection device.

3. A bus interconnection discrimination device, which uses the bus interconnection discrimination method according to any one of claims 1-2, characterized in that, Including: A closing state acquisition unit for obtaining the closing state of the three normally open auxiliary contacts connected in series in the circuit breaker in the bus-coupling interval of the primary side system of the double-bus connection, denoted as the first closing state; obtaining the closing state of the disconnecting switch on the first bus side of the primary side system of the double-bus connection, denoted as the second closing state; obtaining the closing state of the disconnecting switch on the second bus side of the primary side system of the double-bus connection, denoted as the third closing state; obtaining the closing state of the disconnecting switch on the first bus side in the interval of the primary side system of the double-bus connection, denoted as the fourth closing state; obtaining the closing state of the disconnecting switch on the second bus side in the interval of the primary side system of the double-bus connection, denoted as the fifth closing state; A current state acquisition unit for obtaining the current value detected by the current transformer of phase A in the bus-coupling interval of the primary side system of the double-bus connection, denoted as the first current value; obtaining the current value detected by the current transformer on the first bus side in the interval of the primary side system of the double-bus connection, denoted as the second current value; obtaining the current value detected by the current transformer on the second bus side in the interval of the primary side system of the double-bus connection, denoted as the third current value; A logic judgment unit is used to judge whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic. If so, the bus differential protection is controlled to enter the interconnection state; otherwise, the bus protection device is controlled to release the bus interconnection operation state.

4. The busbar interconnection discrimination device according to claim 3, characterized in that, When the logic judgment unit judges whether the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic, it is specifically used to: Determine whether the first closing state, the second closing state, the third closing state and the first current value meet a first preset condition; Determining whether the fourth closing state, the fifth closing state, the second current value, and the third current value meet a second preset condition; When the first preset condition and the second preset condition are met, it indicates that the first closing state, the second closing state, the third closing state, the fourth closing state, the fifth closing state, the first current value, the second current value and the third current value meet the preset interconnection state logic; The first preset condition is: The first closing state, the second closing state and the third closing state are the first state, or the first current value is greater than 0, and the first state is the closing state; The second preset condition is: The fourth closing state and the fifth closing state are the first preset state, or the second current value and the third current value are both greater than 0.

5. A busbar interconnection discrimination device, characterized in that, include: Busbar protection device; The three-phase normally open auxiliary contact of the busbar interval circuit breaker in the double busbar connection primary side system is connected to the first input of the busbar protection device; The normally open auxiliary contact of the disconnector on the first bus side of the double bus connection primary side system is switched into the second input of the bus protection device; The normally open auxiliary contact of the isolating switch on the second bus side of the double bus connection primary side system is switched into the third input of the bus protection device; The normally open auxiliary contact of the disconnector on the first bus side in the bay of the double bus connection primary side system is switched into the fourth input of the bus protection device; The normally open auxiliary contact of the disconnector on the second bus side in the bay of the primary side system of the double bus connection is switched into the fifth input of the bus protection device; It also includes the busbar interconnection determination device according to any one of claims 3-4; When the busbar interconnection determination device obtains the closing state of the three-phase normally open auxiliary contacts in series in the busbar interval circuit breaker in the double busbar connection primary side system, specifically: detecting the energized state of the first input of the busbar protection device The busbar interconnection determination device obtains the closing state of the disconnector on the first busbar side of the double busbar connection primary side system by: detecting the energized state of the second input of the busbar protection device; The busbar interconnection determination device obtains the closing state of the disconnector on the second busbar side of the double busbar connection primary side system by: detecting the energized state of the third input of the busbar protection device; The bus interconnection discrimination device obtains the closing state of the disconnector on the first bus side in the interval of the primary side system of the double-bus connection, specifically: detecting the energized state of the fourth input of the bus protection device; The bus interconnection discrimination device obtains the closing state of the disconnector on the second bus side in the interval of the primary side system of the double-bus connection, specifically: detecting the energized state of the fifth input of the bus protection device.

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