CN105427182A - Transformer area low-voltage cause analysis method and transformer area low-voltage cause analysis device - Google Patents

Transformer area low-voltage cause analysis method and transformer area low-voltage cause analysis device Download PDF

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Publication number
CN105427182A
CN105427182A CN201410398065.6A CN201410398065A CN105427182A CN 105427182 A CN105427182 A CN 105427182A CN 201410398065 A CN201410398065 A CN 201410398065A CN 105427182 A CN105427182 A CN 105427182A
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voltage
circuit
transformer
substation transformer
pressure drop
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刘涌
王承民
史伟伟
王建辉
袁秋实
黄起强
李皓岩
元梨花
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SHANGHAI PROINVENT INFORMATION TECH Ltd
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SHANGHAI PROINVENT INFORMATION TECH Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention relates to the field of distribution transformer area voltage treatment and management, and discloses a transformer area low-voltage cause analysis method and a transformer area low-voltage cause analysis device. The transformer area low-voltage cause analysis method comprises the steps of establishing a mathematical model of a distribution transformer; calculating the superior voltage of the distribution transformer; calculating the voltage drop of the distribution transformer; establishing a mathematical model of the line; calculating the voltage drop of the line according to the mathematical model of the line; and determining the cause of the transformer low-voltage according to the superior voltage of the distribution transformer, the voltage drop of distribution transformer and the voltage drop of the line. The transformer area low-voltage cause analysis method and the transformer area low-voltage cause analysis device have advantages of realizing quantitative analysis for the cause of the transformer area low voltage and improving accuracy in analyzing the cause of the transformer area low voltage.

Description

A kind of platform district low-voltage genetic analysis method and device
Technical field
Field, distribution transformer platform area of the present invention, particularly relates to a kind of platform district low-voltage genetic analysis method and device.
Background technology
Power distribution network is that electric device electric energy is sent out, become, defeated, the link to customer power supply of joining in four large links, and 10kV low-voltage network is in the terminal of power distribution network, is directly connected with 380/220V electric power low-pressure user by substation transformer.The region that the customer group that namely distribution transformer platform area is supplied by substation transformer, substation transformer low-pressure side feeder line and this substation transformer forms.
As the pith in power distribution network, electric energy directly being distributed to low-voltage customer, distribution transformer platform area low-voltage problem, can cause power supply trouble often.Need to utilize particular data in practical application, by strict analysis process and judging basis, the platform district low-voltage origin cause of formation analyzed.
Prior art utilizes the business software of some maturations to carry out distribution transformer platform area low-voltage genetic analysis usually, and such as: the DIgSILENT etc. of the ETAP of the U.S., Germany, and these softwares all cannot be applied and are directly used in low-voltage analysis.Its reason is, first excessively strong, the skilled grasp of Software Specialty is very difficult, and secondly operating habit and electric power enterprise routine work custom are not inconsistent, and these softwares can only calculate phenomenon itself, when result of calculation shows to there is low-voltage problem, the origin cause of formation of low-voltage cannot be determined.Such as, can accurately calculating certain user by software, to locate voltage be 180V, but cause voltage only to have the reason of 180V to determine.Reason, when finding low-voltage problem, is classified as that transformer overload, wire diameter are meticulous, excessive three reasons of radius of electricity supply by current power supply enterprise usually simply, there is no clear and definite analytical approach.
Summary of the invention
The invention provides a kind of platform district low-voltage genetic analysis method and device, solve the technical matters lacking effective low-voltage genetic analysis method in prior art.
The object of the invention is to be achieved through the following technical solutions:
A kind of platform district low-voltage genetic analysis method, comprising:
Set up the mathematical model of substation transformer;
Calculate substation transformer superior voltage;
Calculate substation transformer pressure drop;
Set up the mathematical model of circuit;
According to the mathematical model of described circuit, computational scheme pressure drop;
According to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.
A kind of platform district low-voltage genetic analysis device, comprising:
First model building module, for setting up the mathematical model of substation transformer;
First computing module, for calculating substation transformer superior voltage;
Second computing module, for calculating substation transformer pressure drop;
Second model building module, sets up the mathematical model of circuit;
3rd computing module, for the mathematical model according to described circuit, computational scheme pressure drop;
Analysis and processing module, for according to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.
By a kind of platform district low-voltage genetic analysis method provided by the invention and device, by setting up the mathematical model of substation transformer, calculate substation transformer superior voltage, calculate substation transformer pressure drop, set up the mathematical model of circuit, according to the mathematical model of described circuit, computational scheme pressure drop, according to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.Achieve the quantitative test of the platform district low-voltage origin cause of formation, improve the causal analytic accuracy rate of platform district low-voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, also can obtain other accompanying drawing according to these accompanying drawings.
The application scenarios figure of a kind of district's low-voltage genetic analysis method that Fig. 1 provides for the embodiment of the present invention;
The process flow diagram of a kind of district's low-voltage genetic analysis method that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of district's low-voltage genetic analysis device that Fig. 3 provides for the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The application scenarios figure of a kind of district's low-voltage genetic analysis method is provided in the embodiment of the present invention, as shown in Figure 1, as we can see from the figure, first a Ge Tai district obtains electric energy by substation transformer transformer from 10kV circuit, after becoming 400V, deliver to user through low-voltage circuit.Trunk and branched low pressure wire are BLV-25, and service conductor is 6 squares of aluminum steels.
User's voltage equals transformer superior voltage and deducts transformer pressure drop and low-voltage circuit pressure drop, and platform district low-voltage refers to user with locating voltage lower than the voltage lower limit value of national Specification.If user's low voltage, possible reason comprises: transformer superior voltage is on the low side, transformer pressure drop is excessive, line drop is excessive and the various combination of above three kinds of reasons.
Therefore, the origin cause of formation of analysis station district low-voltage, reality is analyzed successively to superior voltage, transformer pressure drop, low-voltage circuit pressure drop exactly, and differentiates the proportion that three kinds of pressure drops are shared in the generation of final low-voltage.
Based on the application scenarios shown in Fig. 1, introduce a kind of platform district low-voltage genetic analysis method provided in the embodiment of the present invention, as shown in Figure 2, the method comprises the steps:
Step 201, set up the mathematical model of substation transformer;
Wherein, because low-voltage platform area is three-phase four-wire power supply, what exist in various degree between A, B, C three-phase is load unbalanced, and therefore transformer model need set up +/-/0 sequence model.Such as: according to the relevant criterion of south electric network, substation transformer generally takes DYN winding connection, and therefore transformer positive sequence impedance, negative sequence impedance, 0 sequence impedance are equal to Transformer Short Circuit Impedance.Because transformer high-voltage is D connection, so the primary side voltage of positive sequence is primary side positive sequence voltage, the primary side voltage of negative phase-sequence is primary side negative sequence voltage, and 0 sequence primary side voltage is 0, i.e. short circuit.Therefore, transformer positive sequence equivalent circuit, transformer negative phase-sequence equivalent electrical circuit, transformer 0 sequence equivalent electrical circuit can be drawn.
Step 202, calculating substation transformer superior voltage;
Wherein, according to the Circuit Fault on Secondary Transformer voltage and current of metering automation system acquisition, first carry out positive sequence, negative phase-sequence, 0 sequence decomposition, then calculating transformer primary side positive-negative sequence voltage, finally synthesizes primary side voltage.Because substation transformer belongs to consumer to 10kV circuit, therefore its rated primary voltage is 10kV, if permissible variation lower limit is-7%, i.e. 9.3kV, its corresponding phase voltage is 5.37kV.
Need in this step to judge that whether primary side voltage is on the low side, therefore, this step comprises:
Step 202-1, according to Circuit Fault on Secondary Transformer actual measurement voltage, load and substation transformer mathematical model, calculate substation transformer primary side voltage;
Step 202-1, foundation industry standard, judge that whether primary side voltage is lower than permission voltage deviation lower limit; Such as: the primary side voltage calculated and 5.37kV compare, can judge that whether primary voltage is on the low side, 5.37v is the permission voltage deviation lower limit specified in State Grid's industry standard.
Step 202-2, when described primary side voltage lower than permission voltage deviation threshold value time, calculate the substation transformer secondary side no-load voltage that described primary side voltage is corresponding, and calculate the voltage deviation of described no-load voltage and substation transformer rated secondary voltage.
Such as: substation transformer rated secondary voltage is 400V, namely during open circuit, secondary side voltage is 400V, and corresponding phase voltage is 231V.When supposing that substation transformer is unloaded, transformer primary side voltage is constant, the voltage of Circuit Fault on Secondary Transformer when now can calculate zero load according to transformer equivalent circuit and the primary side voltage that calculates, the deviation of this voltage and 231V is the contribution margin of primary side voltage deviation to voltage drop.
Step 203, the pressure drop of calculating substation transformer;
Wherein, substation transformer pressure drop refers to that load current flows through the pressure drop of substation transformer generation.The permissible value of substation transformer pressure drop gets short circuit voltage value, the pressure drop produced on short-circuit impedance when namely transformer flows through rated current.If substation transformer pressure drop is not more than short circuit voltage value, then leap to step 204 and continue to perform, otherwise calculating transformer pressure drop is to the contribution margin of low-voltage.Therefore, step 203 comprises:
Step 203-1, according to described substation transformer secondary side actual measurement voltage, the pressure drop of carry calculation substation transformer;
Step 203-2, judge the magnitude relationship of substation transformer pressure drop and substation transformer short-circuit voltage;
Step 203-3, when substation transformer pressure drop is greater than substation transformer short-circuit voltage, calculate the voltage deviation of substation transformer pressure drop and substation transformer short-circuit voltage.
Computing method are that actual pressure drop value deducts short circuit voltage value.
The pressure drop of transformer can use formula (1) to calculate:
(1)
In formula, for transformer pressure drop, P is the active power of transformer transmission, and Q is the reactive power of transformer transmission, R bfor the short-circuit resistance of transformer, X bfor the short-circuit reactance of transformer, U bfor the rated voltage (considering that voltage deviation can not be excessive, so general rated voltage replaces working voltage herein) of transformer.
Above formula in the calculation, U bdesirable 1, P and Q can obtain from investigational data, R band X bthen need to look into the load loss (short circuit loss) in transformer parameter table, short-circuit voltage (short-circuit impedance) calculates, computing method are as follows:
(2)
Wherein, for load loss (short circuit loss), S bfor transformer rated capacity.
(3)
(4)
In investigation, if cannot above-mentioned parameter be obtained, then following short-cut method can be adopted to calculate:
(5)
Wherein S is the working capacity of transformer, U kfor the short-circuit voltage of transformer.If U in investigation kalso cannot obtain, and transformer rated capacity can only be obtained, then can value as follows:
(6)
Calculated transformer pressure drop to after the contribution margin of low-voltage, the origin cause of formation excessive to transformer pressure drop is analyzed.Transformer pressure drop is excessive may three reasons, and one is heavy duty, and two is that reactive power is excessive, and three is uneven.According to the definition of substation transformer heavy duty, if load factor > 80%, then heavy duty can be classified as.Heavy duty not necessarily can cause low voltage, but there is potential safety hazard, should eliminate in time.Be not less than the requirement of 0.9 according to substation transformer power factor, if substation transformer actual power factor does not meet the demands, then suppose that depressor is gained merit constant, power factor compensation to 0.9, recalculates transformer pressure drop.This pressure drop and transformer actual pressure drop are subtracted each other, obtains power factor (reactive power is excessive) on the low side to the contribution margin of low-voltage.Suppose transformer total load to be evenly distributed on three-phase, recalculate voltage drop, this voltage drop and actual voltage-drop are subtracted each other, obtain the contribution margin of three-phase imbalance to low-voltage.
Step 204, set up the mathematical model of circuit;
Wherein, because distribution transformer platform area is three-phase four-wire power supply, therefore circuit model also needs to set up positive and negative zero sequence model, and described positive and negative zero sequence model comprises circuit positive sequence equivalent circuit, circuit negative phase-sequence equivalent electrical circuit and circuit 0 sequence equivalent electrical circuit.According to three-phase and four-line line construction, the positive sequence impedance of circuit, negative sequence impedance are phase line impedence, and 0 sequence impedance is the neutral wire impedance of phase line impedence+3 times.+/-/0 sequence the model of three-phase and four-line circuit can be set up thus.
Step 205, mathematical model according to described circuit, computational scheme pressure drop;
Wherein, because circuit head end voltage is substation transformer idle voltage output, and during nominal load, substation transformer secondary voltage is that rated voltage deducts short-circuit voltage, therefore can using this voltage as ratings during head end voltage loads.Such as: 380V permissible variation of powering is-7%, so terminal voltage minimum value is 353V, corresponding phase voltage is 204V.Therefore, the pressure drop that circuit allows is (pressure drop of 231V-204V-transformer short-circuit), and namely this value can be used as the permissible value of line drop.
According to the substation transformer data of metering automation monitoring, then load distribution is on the line reduced to and concentrates on head end, concentrate on centre, concentrate on end, be uniformly distributed and first, in, end five kinds of forms such as to distribute in proportion, the circuit model computational scheme pressure drop that integrating step 203 is set up.Line drop is compared with permissible value, can judge that whether line drop is excessive.
The pressure drop of circuit can use formula (7) to calculate:
(7)
In formula for low-voltage circuit pressure drop, P is the active power of line transmission, and Q is the reactive power of line transmission, R lfor line resistance, X lfor line reactance, U lfor the rated voltage (considering that voltage deviation can not be excessive, so use rated voltage herein) of circuit.
According to the pressure drop on line parameter circuit value, computational scheme be
(8)
R land x lbe resistance and the reactance of conductor respectively, L is conductor length.In the calculation, L gets radius of electricity supply, r land x lthe wire type of investigational data or wire diameter are looked into databook and are obtained respectively.
Power load distributing can be reduced to and concentrate on head end, concentrate on centre, concentrate on end and be uniformly distributed four kinds of situations, below in conjunction with formula (7) and power load distributing situation, calculates the loss of voltage that different load distribution is corresponding respectively.
1) load concentrates on head end
If load concentrates on head end, then circuit does not flow through electric current, so line drop is 0, then artificial whole low-voltage circuit can be equal to Circuit Fault on Secondary Transformer line voltage, the voltage namely collected in metering automation by voltage.So now
(9)
2) load concentrates on centre
If load concentrates on centre, then circuit first half flows through electric current, and produce pressure drop, latter half does not flow through electric current, does not produce pressure drop.So line drop is from Circuit Fault on Secondary Transformer, increase gradually to line end, at 1/2 place of radius of electricity supply, reach the maximal value shown in formula (10), 1/2 place's voltage of circuit second half section voltage and radius of electricity supply is equal.
(10)
3) load concentrates between end
If load concentrates on end, then whole circuit has electric current to flow through, and pressure drop progressively increases, and reaches maximal value at line end, and namely terminal voltage is minimum, and voltage drop value is
(11)
4) load is uniformly distributed
When load is uniformly distributed, first need to set up the expression formula of load with the length of circuit as shown in (12).
(12)
Wherein, x subscript shows that x is the distance of low-voltage circuit head end to current inspecting position at distance head end x place.
Can calculate like this, from head end to the pressure drop of x be
(13)
From (13) formula, along with the increase of x, pressure drop also progressively increases, and reaches maximal value in line end pressure drop, for
(14)
If line drop is not excessive, then jumps to step 206 and continue to perform.Otherwise the excessive contribution margin to low-voltage of computational scheme pressure drop.Computing method are that actual pressure drop value deducts line drop permissible value.Line drop is excessive may four reasons, and one is heavy duty (wire diameter is meticulous), and two is that reactive power is excessive, and three is three-phase imbalances, and four is that circuit is long.
Can calculate in the following several ways the contribution margin of low-voltage for circuit:
(1) if circuit actual power factor does not meet the demands, then suppose that load is gained merit constant, power factor compensation to 0.9, recalculates line drop, this pressure drop and circuit actual pressure drop are subtracted each other, obtains power factor (idle excessive) the on the low side contribution margin to low-voltage.
(2) suppose circuit total load to be evenly distributed on three-phase, recalculate voltage drop, this voltage drop and actual voltage-drop are subtracted each other, obtain the contribution margin of three-phase imbalance to low-voltage.
(3) if line powering radius is greater than the value (as 500 meters) of standard-required, then suppose that load is constant, reduces to standard-required value, recalculates line drop by radius of electricity supply, result of calculation and actual pressure drop are subtracted each other, what obtain is that circuit is long to the contribution margin to low-voltage.
Step 206, according to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.
Wherein, when low-voltage occurs, according to the result of calculation of step 202, step 203, step 205, can determine to cause the origin cause of formation of low-voltage may be transformer primary side low voltage, transformer heavy duty, transformer efficiency factor is on the low side, Three-Phase Transformer is uneven, circuit is heavily loaded, line power factor is low, circuit three-phase imbalance, circuit long in one or more, if the combined action of several reason, then sort according to the contribution margin of each origin cause of formation, can main reason be determined.
After said method flow process completes, Excel or statistical analysis software can be utilized to form the easy low-voltage assistant analysis instrument of operation.
By a kind of platform district low-voltage genetic analysis method provided by the invention, by setting up the mathematical model of substation transformer, calculate substation transformer superior voltage, calculate substation transformer pressure drop, set up the mathematical model of circuit, according to the mathematical model of described circuit, computational scheme pressure drop, according to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.Achieve the quantitative test of the platform district low-voltage origin cause of formation, improve the causal analytic accuracy rate of platform district low-voltage.
The embodiment of the present invention additionally provides a kind of platform district low-voltage genetic analysis device, and as shown in Figure 3, described device comprises:
First model building module 310, for setting up the mathematical model of substation transformer;
First computing module 320, for calculating substation transformer superior voltage;
Second computing module 330, for calculating substation transformer pressure drop;
Second model building module 340, sets up the mathematical model of circuit;
3rd computing module 350, for the mathematical model according to described circuit, computational scheme pressure drop;
Analysis and processing module 360, for according to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.
Wherein, described first model building module 310 is specifically for setting up the positive and negative zero sequence model of transformer, and described positive and negative zero sequence model comprises transformer positive sequence equivalent circuit, transformer negative phase-sequence equivalent electrical circuit and transformer 0 sequence equivalent electrical circuit.
Wherein, described first computing module 320 comprises:
First judging unit 321, for according to Circuit Fault on Secondary Transformer actual measurement voltage, load and substation transformer mathematical model, calculates substation transformer primary side voltage, judges primary side voltage whether lower than the lower limit of voltage deviation;
First computing unit 322, for when described primary side voltage is lower than when allowing the lower limit of voltage deviation, calculate the substation transformer secondary side no-load voltage that primary side voltage is corresponding, and calculate the voltage deviation of described no-load voltage and substation transformer rated secondary voltage.
Wherein, described second computing module 330 comprises:
Second judging unit 331, for according to described substation transformer secondary side actual measurement voltage, the pressure drop of carry calculation substation transformer, judges the magnitude relationship of substation transformer pressure drop and substation transformer short-circuit voltage;
Second computing unit 332, for when substation transformer pressure drop is greater than substation transformer short-circuit voltage, calculates the voltage deviation of substation transformer pressure drop and substation transformer short-circuit voltage.
Wherein, described 3rd computing module 350 comprises:
3rd judging unit 351, for according to industry standard, determines that line drop allows threshold values, according to the mathematical model of described circuit, calculates and judge whether line drop is greater than permission threshold value;
3rd computing unit 352, when allowing threshold value for being greater than when described line drop, calculating actual pressure drop value and allowing the voltage deviation between threshold values.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required hardware platform by software and realize, can certainly all be implemented by hardware, but in a lot of situation, the former is better embodiment.Based on such understanding, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Above to invention has been detailed introduction, applying specific case herein and setting forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (11)

1. a Zhong Tai district low-voltage genetic analysis method, is characterized in that, comprising:
Set up the mathematical model of substation transformer;
Calculate substation transformer superior voltage;
Calculate substation transformer pressure drop;
Set up the mathematical model of circuit;
According to the mathematical model of described circuit, computational scheme pressure drop;
According to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.
2. method according to claim 1, is characterized in that, the described step setting up the mathematical model of substation transformer comprises:
Set up the positive and negative zero sequence model of transformer, described positive and negative zero sequence model comprises transformer positive sequence equivalent circuit, transformer negative phase-sequence equivalent electrical circuit and transformer 0 sequence equivalent electrical circuit.
3. method according to claim 1, is characterized in that, the step of described calculating substation transformer superior voltage comprises:
According to Circuit Fault on Secondary Transformer actual measurement voltage, load and substation transformer mathematical model, calculate substation transformer primary side voltage;
According to industry standard, judge that whether primary side voltage is lower than permission voltage deviation lower limit;
When described primary side voltage is lower than permission voltage deviation threshold value, calculates the substation transformer secondary side no-load voltage that described primary side voltage is corresponding, and calculate the voltage deviation of described no-load voltage and substation transformer rated secondary voltage.
4. method according to claim 1, is characterized in that, the step of described calculating substation transformer pressure drop comprises:
According to described substation transformer secondary side actual measurement voltage, the pressure drop of carry calculation substation transformer;
Judge the magnitude relationship of substation transformer pressure drop and substation transformer short-circuit voltage;
When substation transformer pressure drop is greater than substation transformer short-circuit voltage, calculate the voltage deviation of substation transformer pressure drop and substation transformer short-circuit voltage.
5. method according to claim 1, is characterized in that, the described mathematical model according to described circuit, and the step of computational scheme pressure drop comprises:
Set up the positive and negative zero sequence model of circuit, described positive and negative zero sequence model comprises circuit positive sequence equivalent circuit, circuit negative phase-sequence equivalent electrical circuit and circuit 0 sequence equivalent electrical circuit;
According to industry standard, determine that line drop allows threshold values;
According to the mathematical model of described circuit, calculate and judge whether line drop is greater than permission threshold value;
When described line drop is greater than permission threshold value, calculates actual pressure drop value and allow the voltage deviation between threshold value.
6. a Zhong Tai district low-voltage genetic analysis device, it is characterized in that, described device comprises:
First model building module, for setting up the mathematical model of substation transformer;
First computing module, for calculating substation transformer superior voltage;
Second computing module, for calculating substation transformer pressure drop;
Second model building module, sets up the mathematical model of circuit;
3rd computing module, for the mathematical model according to described circuit, computational scheme pressure drop;
Analysis and processing module, for according to described substation transformer superior voltage, described substation transformer pressure drop and described line drop, the origin cause of formation of determining table district low-voltage.
7. device according to claim 6, it is characterized in that, described first model building module is specifically for setting up the positive and negative zero sequence model of transformer, and described positive and negative zero sequence model comprises transformer positive sequence equivalent circuit, transformer negative phase-sequence equivalent electrical circuit and transformer 0 sequence equivalent electrical circuit.
8. device according to claim 6, is characterized in that, described first computing module comprises:
First judging unit, for according to Circuit Fault on Secondary Transformer actual measurement voltage, load and substation transformer mathematical model, calculates substation transformer primary side voltage, judges primary side voltage whether lower than the lower limit of voltage deviation;
First computing unit, for when described primary side voltage is lower than when allowing the lower limit of voltage deviation, calculate the substation transformer secondary side no-load voltage that primary side voltage is corresponding, and calculate the voltage deviation of described no-load voltage and substation transformer rated secondary voltage.
9. device according to claim 6, is characterized in that, described second computing module comprises:
Second judging unit, for according to described substation transformer secondary side actual measurement voltage, the pressure drop of carry calculation substation transformer, judges the magnitude relationship of substation transformer pressure drop and substation transformer short-circuit voltage;
Second computing unit, for when substation transformer pressure drop is greater than substation transformer short-circuit voltage, calculates the voltage deviation of substation transformer pressure drop and substation transformer short-circuit voltage.
10. device according to claim 6, it is characterized in that, described second model building module is specifically for setting up the positive and negative zero sequence model of circuit, and described positive and negative zero sequence model comprises circuit positive sequence equivalent circuit, circuit negative phase-sequence equivalent electrical circuit and circuit 0 sequence equivalent electrical circuit.
11. devices according to claim 6, is characterized in that, described 3rd computing module comprises:
3rd judging unit, for according to industry standard, determines that line drop allows threshold values, according to the mathematical model of described circuit, calculates and judge whether line drop is greater than permission threshold value;
3rd computing unit, when allowing threshold value for being greater than when described line drop, calculating actual pressure drop value and allowing the voltage deviation between threshold values.
CN201410398065.6A 2014-08-14 2014-08-14 Transformer area low-voltage cause analysis method and transformer area low-voltage cause analysis device Pending CN105427182A (en)

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CN104281979A (en) * 2014-09-26 2015-01-14 广东电网有限责任公司电力科学研究院 Method and system for detecting distribution room low-voltage fault type of distribution transformer
CN104281979B (en) * 2014-09-26 2018-05-04 广东电网有限责任公司电力科学研究院 Distribution transformer platform area low voltage failure type detection method and system
CN110196370A (en) * 2019-06-26 2019-09-03 山东电工电气集团智能电气有限公司 The monitoring method and device of transformer
CN110196370B (en) * 2019-06-26 2021-05-04 山东电工电气集团智能电气有限公司 Transformer monitoring method and device
CN111950848A (en) * 2020-07-09 2020-11-17 国网江西省电力有限公司电力科学研究院 Sequence component-based distribution room low voltage identification and reason diagnosis method

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