CN216350922U - Transformer substation's secondary circuit node voltage visualization device - Google Patents
Transformer substation's secondary circuit node voltage visualization device Download PDFInfo
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- CN216350922U CN216350922U CN202121730874.4U CN202121730874U CN216350922U CN 216350922 U CN216350922 U CN 216350922U CN 202121730874 U CN202121730874 U CN 202121730874U CN 216350922 U CN216350922 U CN 216350922U
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Abstract
The utility model discloses a transformer substation secondary circuit node voltage visualization device which comprises a voltage acquisition device and a voltage monitoring host for analyzing and processing acquired voltage signals, wherein the voltage monitoring host is electrically connected with the voltage acquisition device, the voltage acquisition device comprises an intelligent terminal and a voltage measurement module which are electrically connected, the intelligent terminal comprises an upper terminal for connecting a secondary circuit node to be monitored, a divider resistor for controlling the magnitude of acquired voltage and a lower terminal for connecting the voltage measurement module, the upper terminal and the lower terminal are electrically connected through the divider resistor to form a divider resistor loop, one end of the lower terminal is grounded, and the voltage measurement module comprises a voltage acquisition loop. The intelligent terminal is adopted to replace the traditional UK series terminal, the design rule of a secondary circuit is not violated, the disassembly and the assembly are convenient, the voltage dividing resistance circuit is arranged in the intelligent terminal, the size range of the acquired voltage can be controlled, and the safety is improved.
Description
Technical Field
The utility model relates to a transformer substation secondary circuit node voltage visualization device, and belongs to the technical field of power system relay protection.
Background
All low-voltage loops such as a measurement loop, a relay protection loop, a switch control and signal loop, an operation power supply loop, an electric locking loop of a circuit breaker and an isolating switch are collectively called secondary loops;
the secondary circuit is complex in wiring, multiple in links and wide in related range, so that defects existing in the secondary circuit are high in concealment, the secondary circuit of a traditional alternating current transformer substation is supplied with power by adopting direct current voltage at the present stage, the direct current voltage state of an important node in the secondary circuit is only reflected in a mode that the important circuit is regularly observed and a protection device assists in monitoring the circuit state, and the voltage state of the node cannot be directly reflected in time, because the fault of the secondary circuit on the site cannot be found and processed in time, some hidden dangers are found only when equipment fault or large system fault impact occurs, the correct action of a relay protection device is often influenced, serious accidents such as equipment damage or power grid collapse are caused, the damage is extremely large, and the condition that the accident range is expanded is rare;
aiming at the problem of strong defect concealment of the secondary circuit, voltage detection and monitoring are needed to be carried out on important nodes of the secondary circuit, and the running state of the secondary circuit is monitored and analyzed in real time through voltage so as to find defects and overhaul in time;
in the prior art, a UK series single-row through terminal is usually adopted as a secondary circuit terminal of a transformer substation, and a cable needs to be connected in parallel for conventional voltage acquisition, so that the design specification of the secondary circuit of the transformer substation is violated, the acquired voltage cannot be subjected to voltage division conversion, the acquired voltage level cannot be controlled, and the safety performance is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, provides a transformer substation secondary circuit node voltage visualization device, and solves the problem that a secondary circuit terminal cannot perform voltage division conversion during transformer substation secondary circuit node voltage monitoring in the prior art.
In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:
a transformer substation secondary circuit node voltage visualization device comprises:
the voltage monitoring system comprises a voltage acquisition device and a voltage monitoring host for analyzing and processing acquired voltage signals, wherein the voltage monitoring host is electrically connected with the voltage acquisition device;
the voltage acquisition device comprises an intelligent terminal and a voltage measurement module which are electrically connected;
the intelligent terminal comprises an upper terminal used for connecting a node to be monitored of the secondary circuit, a divider resistor used for controlling the magnitude of the collected voltage and a lower terminal used for connecting the voltage measurement module, the upper terminal and the lower terminal are electrically connected through the divider resistor to form a divider resistor circuit, and one end of the lower terminal is grounded;
the voltage measurement module comprises a voltage acquisition loop.
Among this technical scheme, adopt the wisdom terminal to replace traditional UK series terminal, do not violate the design criterion of secondary circuit, conveniently carry out the dismouting, set up the divider resistance return circuit in the wisdom terminal, the voltage size scope of steerable collection improves the security.
Furthermore, the number of the voltage measurement modules is N, and N ≧ 1.
Further, the voltage measurement module includes M voltage acquisition return circuits, and M ≧ 1.
Furthermore, the voltage dividing resistor comprises a first resistor and a second resistor, the first resistor is connected with the upper layer terminal and the lower layer terminal, and the lower layer terminal comprises a third terminal and a fourth terminal which are electrically connected through the second resistor;
the third terminal and the fourth terminal are both electrically connected with the voltage acquisition loop.
Further, the voltage acquisition loop comprises a first voltage acquisition line, an isolation amplification circuit and a second voltage acquisition line which are electrically connected in sequence, and the first voltage acquisition line and the second voltage acquisition line are electrically connected with the intelligent terminal.
Furthermore, relays for controlling the access of the sampling signals are connected in series on the first voltage acquisition line and the second voltage acquisition line.
Further, a low-pass filter circuit is arranged between the first voltage collecting line and the second voltage collecting line.
Further, still include the casing that is used for accomodating wisdom terminal.
Further, the middle part of the shell is provided with a cavity for accommodating the voltage dividing resistor.
Compared with the prior art, the utility model has the following beneficial effects:
in the utility model, the intelligent terminal is used for replacing the traditional UK series single-row through terminal as the terminal of the secondary circuit, the voltage monitoring is carried out on the important nodes of the secondary circuit on the premise of meeting the requirement of the electrical wiring regulation, the operation state of each position of the secondary circuit is displayed and analyzed through the voltage value, so that the maintainers can clearly master the state of each node in the secondary circuit, and the possible defects of the secondary circuit are analyzed through the state, thereby facilitating the timely maintenance;
according to the utility model, the intelligent terminal is provided with the divider resistance loop, and the acquired voltage is controlled by the divider resistance loop while the voltage is acquired, so that the safety is improved;
the intelligent terminal, the voltage measuring module and the voltage monitoring host are used for realizing real-time monitoring of the direct current voltage of an important node in the secondary circuit, and providing technical support for judging the operation of the rotary table of the secondary circuit, finding defects, rectifying and modifying a closed loop and digitizing the secondary circuit;
the device provided by the utility model can rapidly alarm the fault location, assist in judging the fault reason, assist in maintenance refinement and accident treatment efficiency, ensure the essential safety of secondary equipment from the source and provide technical support for constructing a secondary lightning protection system.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent terminal in a transformer substation secondary circuit node voltage visualization apparatus according to an embodiment of the present invention;
fig. 2 is a design schematic diagram of a substation secondary circuit node voltage visualization device provided in the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a connection between an intelligent terminal and a voltage measurement module in a transformer substation secondary circuit node voltage visualization apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a man-machine pair module in a transformer substation secondary circuit node voltage visualization apparatus according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a voltage signal processing process of a voltage monitoring host in a transformer substation secondary circuit node voltage visualization apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a specific work flow of a voltage acquisition loop in a transformer substation secondary loop node voltage visualization apparatus according to an embodiment of the present invention.
In the figure: 1. a first terminal; 2. a second terminal; 3. a third terminal; 4. a fourth terminal; 5. a cavity; 6. a first voltage collection line; 7. a second voltage collection line; r1, a first resistor; r2, a second resistor; k1, a first relay; k2, a second relay; r3, third resistor; c1, capacitance.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The transformer substation secondary circuit node voltage visualization device provided by the embodiment of the utility model comprises an intelligent terminal, a voltage measurement module and a voltage monitoring host which are electrically connected in sequence.
The wisdom terminal is fire-retardant double-deck binding post, satisfies direct current voltage's collection demand, and inside is equipped with the divider resistance return circuit, can be used to control the size of gathering voltage, and the rated voltage of wisdom terminal is 500V, and rated current is 32A, can provide normal secondary circuit wiring, and the size of a dimension is unanimous with current transformer substation's binding post, and the on-the-spot wiring is simple, need not to change original secondary circuit design principle, can directly replace the terminal of UK series terminal as transformer substation's secondary circuit.
The double-deck binding post of wisdom terminal includes upper terminal and lower floor's terminal for gather the voltage of treating monitoring electricity, the electrical connection divider resistance between upper terminal and the lower floor's terminal, in order to constitute the divider resistance return circuit, the size of voltage is gathered in the control.
The upper layer terminal comprises a first terminal 1 and a second terminal 2 which are electrically connected, a main loop of a direct divider resistance loop is formed between the first terminal 1 and the second terminal 2, and the upper layer terminal is electrically connected with an important node to be monitored in the secondary loop so as to collect node voltage.
The lower layer terminal comprises a third terminal 3 and a grounded fourth terminal 4, and the third terminal 3 and the fourth terminal 4 are both electrically connected with the voltage measuring module.
The divider resistor comprises a first resistor R1 and a second resistor R2 which are electrically connected and used for adjusting the higher collection voltage collected by the upper-layer terminal, the upper-layer terminal and the lower-layer terminal are electrically connected through a first resistor R1, the resistance of the first resistor R1 is preferably 10M omega, the second resistor R2 is arranged in the lower-layer terminal, the third terminal 3 and the fourth terminal 4 are electrically connected through a second resistor R2, the resistance of the second resistor R2 is preferably 10k omega, and the collection voltage can be controlled at millivolt level.
The transformer substation secondary circuit node voltage visualization device further comprises a shell used for accommodating the intelligent terminal, flame-retardant materials are preferably selected as materials of the shell, the upper layer terminal and the lower layer terminal are arranged in the shell, and a cavity 5 used for accommodating a voltage dividing resistor is arranged in the middle of the shell.
The voltage measurement modules are arranged in number N, the N voltage measurement modules are connected in parallel, the N voltage measurement modules are respectively connected with the voltage monitoring host, N is larger than or equal to 1, and preferably N = 16.
Each voltage measurement module comprises M voltage acquisition loops, M is larger than or equal to 1, preferably M =8, each voltage acquisition loop comprises a first voltage acquisition line 6, an isolation amplification circuit and a second voltage acquisition line 7 which are electrically connected in sequence, each isolation amplification circuit is an optical coupling loop, each first voltage acquisition line 6 is electrically connected with a third terminal 3, each second voltage acquisition line 7 is electrically connected with a fourth terminal 4, each first voltage acquisition line 6 is connected with a first relay K1 and a third resistor R3 in series, each second voltage acquisition line 7 is connected with a second relay K2 in series, a capacitor C1 is connected between each first voltage acquisition line 6 and each second voltage acquisition line 7, the fourth terminal 4 of each intelligent terminal is grounded, and each third resistor R3 and the capacitor C1 form a low-pass filter circuit.
During operation, corresponding voltage acquisition line is drawn forth from the third terminal 3 that corresponds the wisdom terminal to every voltage measurement module, fourth terminal 4, the access of first relay K1 and the second relay K2 control sampling signal of voltage measurement module internal design, only can form ground return circuit and acquisition terminal to ground voltage after closed first relay K1 and second relay K2, the third resistance R3 of circuit simultaneous design constitutes low pass filter circuit with electric capacity C1, can effectively get rid of the line interference, the signal is kept apart after passing through low pass filter circuit and is enlargied.
The voltage acquisition loop further comprises an operational amplification chip for amplifying the voltage signal for the second time, a second RC low-pass filter for filtering interference for the second time and an A/D conversion chip, and the specific working process of the voltage acquisition loop comprises the following steps:
the intelligent terminal finishes voltage acquisition and resistance voltage division processing to generate a weak voltage signal, and the voltage signal enters the voltage measurement module;
the voltage signal is filtered through an RC low-pass filter circuit formed by a third resistor R3 and a capacitor C1, and then is isolated and amplified through an optocoupler circuit;
the signals after the isolation amplification processing are subjected to operational amplification chip to amplify the voltage signals again, and the voltage signals are amplified to 2V;
the signal amplified for the second time is accessed to a second RC low-pass filter circuit for filtering processing before sampling;
then the sampling signals enter an A/D conversion chip to complete A/D sampling operation, and finally the sampling signals after the operation are transmitted to a voltage monitoring host.
Preferably, an RS485 interface is adopted between the voltage measuring module and the voltage monitoring host for communication connection, so that a voltage signal acquired by the voltage measuring module is transmitted to the voltage monitoring host, the voltage monitoring host controls the on-off of each channel voltage acquisition loop in a polling mode, and the insulation reduction of a direct current system caused by the existence of a sampling loop is avoided.
The voltage monitoring host processes and analyzes the received voltage signal and judges and alarms faults, the voltage monitoring host and the substation background monitoring system are provided with an RS485 interface so far to realize communication connection, or the alarm information is transmitted to the substation background monitoring system through a switching value signal.
The work flow of the voltage monitoring host comprises the following steps:
setting a voltage reference value UDatumAlarm voltage threshold value delta UThreshold value；
Starting and operating equipment, and collecting voltage U of an input end;
calculating delta U = | U-UDatum|；
Delta U and Delta UThreshold valueAnd (3) comparison operation:
if Δ U ≦ Δ UThreshold valueIf the threshold value is normal, continuing to perform the next voltage acquisition operation;
otherwise, the voltage of the secondary loop contact is abnormal, an alarm message is sent out, and the next voltage acquisition operation is continued.
The voltage measurement host can set the number of voltage channels started by each voltage measurement module, can select to start or close each voltage channel, each voltage channel corresponds to one voltage acquisition loop in the voltage measurement module, a single voltage channel can set the voltage values of the upper limit and the lower limit, and the functions of real-time monitoring and intelligent defect analysis of the secondary loop can be realized through a fault judgment method.
According to the utility model, the intelligent terminal is adopted to replace the traditional UK wiring terminal, so that the voltage measurement of the target node can be realized under the condition that the requirement of the regulation is not violated, the functions of acquiring and displaying the voltage of the target node of the secondary circuit can be conveniently realized, the voltage alarm threshold of each node can be set, and the functions of real-time monitoring and intelligent defect judgment can be conveniently realized.
By arranging the transformer substation secondary circuit node voltage monitoring device in the transformer substation, node voltage visual display, online monitoring and intelligent diagnosis are facilitated, and visual information support, decision and safe operation basis with more dimensions can be provided for the daily operation and maintenance, exception handling, accident analysis and maintenance working conditions of the traditional transformer substation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a visual device of transformer substation's secondary circuit node voltage which characterized in that:
the voltage monitoring system comprises a voltage acquisition device and a voltage monitoring host for analyzing and processing acquired voltage signals, wherein the voltage monitoring host is electrically connected with the voltage acquisition device;
the voltage acquisition device comprises an intelligent terminal and a voltage measurement module which are electrically connected;
the intelligent terminal comprises an upper terminal used for connecting a node to be monitored of the secondary circuit, a divider resistor used for controlling the magnitude of the collected voltage and a lower terminal used for connecting the voltage measurement module, the upper terminal and the lower terminal are electrically connected through the divider resistor to form a divider resistor circuit, and one end of the lower terminal is grounded;
the voltage measurement module comprises a voltage acquisition loop.
2. The substation secondary circuit node voltage visualization device according to claim 1, wherein: the number of the voltage measuring modules is N, and N is not less than 1.
3. The substation secondary circuit node voltage visualization device according to claim 1, wherein: the voltage measurement module comprises M voltage acquisition loops, and M ≧ 1.
4. The substation secondary circuit node voltage visualization device according to claim 1, wherein: the voltage dividing resistor comprises a first resistor (R1) and a second resistor (R2), the first resistor (R1) is connected with the upper layer terminal and the lower layer terminal, and the lower layer terminal comprises a third terminal (3) and a fourth terminal (4) which are electrically connected through the second resistor (R2);
the third terminal (3) and the fourth terminal (4) are both electrically connected with the voltage acquisition loop.
5. The substation secondary circuit node voltage visualization device according to claim 1, wherein: the voltage acquisition loop comprises a first voltage acquisition line (6), an isolation amplification circuit and a second voltage acquisition line (7) which are electrically connected in sequence, and the first voltage acquisition line (6) and the second voltage acquisition line (7) are electrically connected with the intelligent terminal.
6. The substation secondary circuit node voltage visualization device according to claim 5, wherein: relays for controlling the access of sampling signals are connected in series on the first voltage acquisition line (6) and the second voltage acquisition line (7).
7. The substation secondary circuit node voltage visualization device according to claim 5, wherein: a low-pass filter circuit is arranged between the first voltage collecting line (6) and the second voltage collecting line (7).
8. The substation secondary circuit node voltage visualization device according to claim 1, wherein: the intelligent terminal also comprises a shell used for accommodating the intelligent terminal.
9. The substation secondary circuit node voltage visualization device of claim 8, wherein: the middle part of the shell is provided with a cavity (5) for accommodating the voltage-dividing resistor.
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| CN202121730874.4U CN216350922U (en) | 2021-07-28 | 2021-07-28 | Transformer substation's secondary circuit node voltage visualization device |
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| CN202121730874.4U CN216350922U (en) | 2021-07-28 | 2021-07-28 | Transformer substation's secondary circuit node voltage visualization device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514692A (en) * | 2021-07-16 | 2021-10-19 | 国网江苏省电力有限公司检修分公司 | Transformer substation secondary circuit node voltage monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514692A (en) * | 2021-07-16 | 2021-10-19 | 国网江苏省电力有限公司检修分公司 | Transformer substation secondary circuit node voltage monitoring device |
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