CN109782090B - Method for judging power consumer variable relation - Google Patents
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Abstract
The method for judging the power consumer phase change relationship can solve the technical problem that the existing power point phase change relationship is difficult to judge or cannot be judged. The method comprises the following steps: s100, loading a load with rated power at a power utilization point needing to judge the phase change relation, and monitoring the current before and after loading the load phase; s200, monitoring currents corresponding to the front and rear power supply sides loaded with loads on a low-voltage outlet end line of the transformer; s300, synchronously linking a load side and a power supply side, and respectively observing the change of phase line current respectively corresponding to the load side and the power supply side when switching rated load; s400, judging the electricity utilization phase change relation according to whether the difference values of the front current and the rear current of the load side and the power side are equal or not. Based on the current synchronism, the load power/current of a rated value is added to the phase line of the tested point, the current is measured at the load side and the low-voltage outlet end of the transformer, namely the power supply end, and whether the difference value before and after the current is consistent or not is observed according to the switched load so as to judge the transformer to which the phase line belongs.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a method for judging a power consumer variable relation.
Background
The accurate judgment of the subordination relationship between the distribution transformer and the user is always a difficult problem for power supply enterprises, and is particularly prominent in urban areas. Due to the requirement of urban development, the low-voltage power supply network is fast in change and the conditions of line adjustment and erection are common due to the fact that the normalized work of road transformation, removal, brightening and the like and the fact that most of the normalized work is buried cables. Therefore, the subordination relationship between the transformer and the user is very complicated, the work of line loss, rush repair, new installation and capacity increase and the like is difficult, and the power supply reliability is also influenced.
The subordination relation of a power station (the relation between a power point of a power consumer and a transformer of the power station area, which is called the power station for short) is required to be accurate in the work of line loss, emergency repair, new installation capacity increase and the like of the power supply enterprise. The actual accuracy of the platform relationship is not high due to the situations of historical accumulation, urban road reconstruction, pole line migration, cable grounding and the like. The equipment such as a platform area identifier used by the conventional common piece often has wrong judgment and missed judgment due to the technical characteristics of the equipment. How to make up for the defects of the existing equipment and find out the accurate subscriber station relationship becomes the urgent need for the line loss treatment work.
The existing station area general survey instrument has many disadvantages based on a carrier signal mode:
1. the strong signal is easy to cross the station and cross the station, and the weak signal can not be received in a long distance;
2. distribution network harmonic interference causes inaccurate measurement;
3. the three-phase electricity user can not accurately judge the transformer attribution of each phase (a phase line and a zero line are required to be connected to form a loop, the three phase lines respectively get electricity from different transformers, but only one zero line is needed, so that the condition that a non-zero-taking line area can not be measured or the condition that all the zero lines are common is caused).
Disclosure of Invention
The invention provides a method for judging a phase change relationship of power consumption points, which can solve the technical problem that the phase change relationship of the power consumption points is difficult to judge or cannot be judged in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for judging the relation between power consumers and transformation is disclosed, wherein, the phase is phase line/live line, the transformation is transformer, the single-phase power consumers are the attribute relation between each phase of the user transformation and the three-phase power consumers and the transformer, hereinafter referred to as phase transformation relation;
the method comprises the following specific steps:
s100, loading a load with rated power at a power utilization point needing to judge the phase change relation, and monitoring corresponding front and rear currents by using a clamp meter at the loaded load phase;
s200, monitoring currents corresponding to the front and rear power supply sides of a loaded load on a low-voltage outlet end line of the transformer by using a clamp meter;
and S300, synchronously contacting (using a telephone or an interphone), and observing the change of the current of the corresponding phase line when switching the rated load.
S400, judging the phase change relation according to whether the difference values of the front current and the rear current of the load side and the power side are equal.
According to the technical scheme, the novel method for judging the household variable relationship, namely the current synchronization difference method, which is researched and practiced from line loss treatment, thoroughly changes the situations of wrong judgment and missed judgment of the conventional household variable general survey equipment. Based on the synchronism of the current, the invention adds the load power/current of a rated value to the measured power point, measures the current at the load side and the low-voltage outlet end of the transformer, and observes the change of the current value according to the switching load so as to judge the transformer to which the phase line belongs.
Has the advantages that:
1. the invention does not need to determine the house-to-house relationship in a power failure mode, thereby reducing the power failure time and improving the power supply reliability;
2. the invention makes the phase change judgment more direct and accurate, and avoids the defects of strong and easy series of signals, short distance of weak signals and easy harmonic interference of other carrier signal judgment modes;
3. the invention can accurately judge the attribution of each phase line for special abnormal wiring (one meter box or one three-phase meter), and thoroughly changes the short board of the current transformer area identification instrument.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a schematic diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
The actual relationship of the user stations, namely the topological relationship of the low-voltage distribution network, is the physical relationship of power supply for a transformer to users. The power consumer and the transformer are physically connected by a wire, the existing station area identification/general survey equipment judges by using a carrier wave or zero sequence current mode, and the attribution misjudgment and misjudgment rate of some difficult power utilization points are higher in actual use. The concrete is embodied in the following 3 aspects:
the strength of the carrier signal of the station area identification device has a great influence on the accuracy of the judgment. The strong signal is easy to cross the station and cross the station, and the weak signal transmission distance is limited.
For example; 2 transformers with the length of less than 30 meters are arranged at the gate of a certain district in the city, and when the transformer is tested, signals of power utilization points are received at 2 transformers, so that the judgment result has no use value.
Harmonic interference of a distribution network influences signals, so that the signals cannot be detected;
in some abnormal electricity utilization conditions, the same meter box and the same three-phase meter respectively take electricity from 2 transformers, because the existing station area test equipment needs to take phase lines and zero lines to form a loop, a plurality of phase lines respectively take electricity from different transformers, but only one zero line is used, the condition that the station area which does not take the zero line cannot measure or the condition that all the zero lines are common is caused), and the attribution of the phase lines cannot be accurately judged.
As shown in fig. 1, the method for determining a power consumption change relationship according to this embodiment includes the following steps:
s100, loading a load with rated power at a power utilization point needing to judge the phase change relation, and monitoring corresponding front and rear currents by using a clamp meter at the loaded load phase;
s200, monitoring currents corresponding to the front and rear power supply sides of a loaded load on a low-voltage outlet end line of the transformer by using a clamp meter;
and S300, synchronously contacting (using a telephone or an interphone), and observing the change of the current of the corresponding phase line when switching the rated load.
S400, judging the phase change relation according to whether the difference values of the front current and the rear current of the load side and the power side are equal.
The method comprises the following specific steps:
s100, loading a load with rated power at a power utilization point needing to judge the phase change relation: p, monitoring corresponding front and rear currents Ir1 and Ir2 by using a clamp meter in a loaded load phase;
s200, monitoring currents Ie1 and Ie2 corresponding to the front and rear power supply sides of a loaded load by using a clamp meter on a low-voltage outlet end line of the transformer;
s300, synchronously contacting (using a telephone or an interphone), switching a rated load P, and observing and recording corresponding front and rear switching currents Ir1 and Ir2 of a load side and front and rear switching currents Ie1 and Ie2 of a power supply side.
And S400, calculating a load side current difference value delta Ir (delta Ir is Ir1-Ir2) according to the load side front and rear switching currents Ir1 and Ir2, and calculating a power supply side current difference value delta Ie (delta Ie is Ie1-Ie2) according to the power supply side front and rear switching currents Ie1 and Ie 2. And (delta Ir) and delta Ie (or the phase difference is within 5 percent), and judging that the phase change is consistent. And the judgment can be more accurate by loading for multiple times according to the actual situation on site.
The steps of an embodiment of the present invention are further described below in conjunction with FIG. 2:
s100: loading a load with rated power/current at a power utilization point needing to judge the phase change relation: p, using a clamp meter on a loading load phase line to prepare and monitor current Ir1 (after load is put into operation, the same below) and current Ir2 (before load is put into operation, the same below) corresponding to before and after load is put into operation;
s200: using a clamp meter on a low-voltage outlet end line of the transformer to prepare and monitor currents Ie1 and Ie2 corresponding to a power supply side before and after load switching;
s300: synchronously linking (using a telephone or an interphone), switching rated load/current P, observing and recording corresponding front and back switching currents Ir1 and Ir2 of a load side and front and back switching currents Ie1 and Ie2 of a power supply side.
S400: and calculating a load side current difference delta Ir (delta Ir is Ir1-Ir2) according to the load side front and rear switching currents Ir1 and Ir2, and calculating a power supply side current difference delta Ie (delta Ie is Ie1-Ie2) according to the power supply side front and rear switching currents Ie1 and Ie 2.
And further judging:
the first condition is as follows: with the switching of the load, whether the change of the current is synchronous or not is determined, namely: the change Ir2 → Ir1 → Ir2 of the load-side current and the change Ie2 → Ie1 → Ie2 of the power-supply-side current are consistent with each other when viewed along the time axis.
And a second condition: with the switching of load, whether the variation of observing the electric current is unanimous, promptly: and delta Ir is approximately equal to delta Ie (the actual error can be within 2 percent due to the error of the field clamp meter).
If the above 2 points are satisfied, it can be determined whether the test phase line is physically wired from the transformer, i.e., the phase change relationship/the platform relationship. Because some loads change faster in actual power utilization, the time point with little load change can be selected according to the actual situation on site to measure or load for many times, so that the judgment is more accurate.
By applying the method, a good effect is achieved in the branch line loss treatment in our city, the difficult problem of judging a plurality of subscriber stations is solved, and two typical cases are introduced.
The specific application case is as follows:
cases 1,
And a street lamp meter at a certain position is directly connected with three-phase four-wire lines. The line loss and the negative loss of the transformer A are unqualified, and the positive loss of the adjacent transformer B is unqualified. When the conventional platform area general survey instrument is adopted for testing, the phases a and c belong to the power supply of the A transformer, and the phase b does not belong to the power supply. By adopting the current method of the embodiment, blowers with rated power are used at the meter, the three phases a, B and c are respectively switched repeatedly, the low-voltage outgoing lines of the transformers A and B are observed by adopting a pincerlike ammeter, the switching current of the phases a and c of the transformer A synchronously changes along with the load, the switching current of the phase B of the transformer B synchronously changes along with the load, and the power consumption at the position is judged, wherein the phases a and c are taken from the transformer A, and the phase B is taken from the transformer B. Before and after switching, the phase current of the c phase of the transformer A changes by 3.3A (the multiplying power of the current transformer of the rod switching gateway is 300) → 5.7A, and before and after switching, the phase current of the B phase of the transformer B changes by 0.01A → 2.59A.
And then, the multi-department site repeated inspection shows that the construction unit is not noticed when the construction unit recovers the wiring because the construction unit is transformed by a road, a cable is moved, and the same pole is used for one pole transformer and a box transformer, and the power is obtained from 2 transformers respectively.
Case 2,
In the transformer area line loss control, the transformer area line loss to which the rod-type transformer a belongs is unstable (negative loss is more). After multiple on-site checks, a three-phase four-wire directly-connected street lamp meter is arranged under the transformer area A, and when a conventional transformer area general inspection instrument is adopted for testing, the phases a and c belong to the transformer A for power supply, and the phase B does not belong (a box-type transformer B is arranged nearby, but the test is not successful). The method of current synchronization difference is adopted, blowers with rated power/current are used at the meter, the three phases a, b and c are respectively switched repeatedly, a pincer-shaped ammeter is adopted to observe the low-voltage outgoing line of the transformer A, and the fact that the phases a and c of the transformer A change synchronously with the switching current of the load and the phase b does not change is found. However, the phase B of the transformer B synchronously changes along with the switching current of the load, and the power consumption is judged: a. the phase c gets power from the transformer A, and the phase B gets power from the transformer B.
The method comprises the following specific operation steps:
loading a rated power load (using a blower) P at a street lamp meter box; Δ Ie (current difference between before and after switching of the load on the power supply side) is 3.72A.
Loading a rated load P by using a blower; Δ Ie ═ 3.72A (5.76-2.04);
c-phase secondary current at the transformer A after the load is put into operation: ie1 ═ 5.76A (120 times the multiplying power of the rod-type current transformer (600/5), 0.048 × 120 ═ 5.76);
c-phase secondary current at the transformer A before load input: ie2 is 2.04A (0.017 × 120), Δ Ir (difference between switched currents on the load side) is Ie1 (after switched current on the load side) -Ie2 (before switched current on the load side) is 3.69A (Ir1 is 6.07, Ir2 is 2.38);
after load input, Ir1 ═ 6.07A, and before load input, Ir2 ═ 2.38A;
the delta Ir and the delta Ie are synchronously changed along with the switching of the load by field observation, and the condition I is met; and delta Ie is equal to 3.72A, is approximately equal to delta Ir is equal to 3.69A, the error is 0.8 percent, and the condition two is met. Therefore, the phase c of the street lamp meter is judged to be taken from the phase c of the transformer A. The situation of the phase a is the same, but the phase b is switched along with the load, and the phase 3 current at the transformer is not changed correspondingly, so that the phase b of the street lamp meter is not taken from the transformer A.
Then, detection is carried out at a nearby transformer B, and the phase B current of one switch is found to be changed:
transformer B load is put into the rear transformer B, B-phase secondary current Ie1, and load is put into the front transformer B, B-phase secondary current Ie2, B-phase current Ie1 of transformer B is 3.9A, Ie 2-0.191A, Δ Ie is 3.709a (3.9-0.191);
the delta Ir and the delta Ie are synchronously changed along with the switching of the load by field observation, and the condition I is met; Δ Ie ≈ 3.709A ≈ Δ Ir ≈ 3.69A with an error of 0.5%, which satisfies condition two. Therefore, the phase B of the street lamp meter is judged to be taken from the phase B of the box-type transformer B.
And then, the multi-department site repeated inspection shows that the construction unit is not noticed when the construction unit recovers the wiring because the construction unit is transformed by a road, a cable is moved, and the same pole is used for one pole transformer and a box transformer, and the power is obtained from 2 transformers respectively.
The condition that one power supply point (two transformers for supplying power for a three-phase meter and two transformers for supplying power for a meter box) supplies power with multiple power supplies is checked to obtain multiple positions.
Cases 3,
A certain district, a high-rise apartment house and 8 meter boxes on one floor. The census instruments of 2 manufacturers are adopted for checking, and the subordination relation is not checked.
By adopting the current synchronous difference method of the embodiment, the load is tested by adopting a blower with larger power:
Δ Ir (difference between switching currents before and after the load side) Ie1-Ie2 is 5.99-1.846 is 4.144A.
After the load is put into the meter box, the current Ir1 of the meter box is 5.99, and before the load is put into the meter box, the current Ir2 of the meter box is 1.846;
delta Ie (difference value of switching current before and after the power supply side), namely Ie1-Ie2, namely 6.97-2.87, namely 4.1A;
the power supply side current Ie1 after load input is 6.97, and the current Ie2 before load input is 2.87;
the delta Ir and the delta Ie are synchronously changed along with the switching of the load by field observation, and the condition I is met; Δ Ie ≈ 4.1A ≈ Δ Ir ≈ 4.144A (error of 1.06%), meeting condition two. Therefore, the phase A of the meter box is judged to supply power for the phase A of the transformer.
And then, through phase-by-phase and meter box-by-meter box tests, 8 meter boxes on the floor respectively belong to 3 transformers for power supply, namely 8 meter boxes on the same floor respectively belong to 3 transformer areas.
In summary, the embodiment of the present invention determines the subscriber station relationship by using the synchronicity of power transmission, loading a load with a rated current at a power consumption point (hereinafter referred to as a load side) where the subscriber station relationship needs to be determined, observing the current change condition of the low-voltage power supply side (hereinafter referred to as a power supply side) of the transformer, and comparing the synchronicity of the current transformation ratio of the load side and the power supply side and the consistency of the amplitude change.
The current is adopted for comparison, and other power parameters such as power, voltage and the like are not adopted, because the current is a direct quantity and other parameters are not required to be considered, the fewer the parameter variables are, the better the calculation is, and the data can be more direct and accurate. The power is the product of voltage, current and power factors, which is an indirect quantity with more variable factors; the voltage is greatly influenced by load switching and resistance, and uncontrollable factors are more, so that the comparison by adopting the current is more practical and accurate.
Through the practical application on site, the current synchronization difference method of the embodiment of the invention has the advantages of accurate judgment on the difficult transformer area and simple and visual operation. Particularly, the subscriber station judgment is further carried out, the phase change judgment is further carried out, the subordination relation of the phase line is more accurately and directly judged, the good effect of combing the subscriber station relation in the station area is achieved, and the wiring problem can be detected. In practice, there are many conceivable approaches, such as testing a distribution area for distributed photovoltaic access at night; according to the characteristics of residential and commercial electricity utilization, the peak-shifting power supply can be used in a staggered mode, and the application range can be wider and more accurate through flexible and mobile application.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for judging the power consumer variable relationship is characterized in that: the method comprises the following steps:
s100, loading a load with rated power at a power utilization point needing to judge the phase change relation, and monitoring the current before and after loading the load phase;
s200, monitoring currents corresponding to the front and rear power supply sides loaded with loads on a low-voltage outlet end line of the transformer;
s300, synchronously linking a load side and a power supply side, and respectively observing the change of phase line current respectively corresponding to the load side and the power supply side when switching rated load;
s400, judging the phase change relationship of the electricity according to whether the difference values of the front current and the rear current of the load side and the power side are equal;
the step S400 of determining the phase change relationship includes:
s401, observing whether the change curves of the load side current and the power supply side current are consistent or not from a time axis;
s402, observing whether the current variation is consistent with the switching of the load;
and S403, according to the steps S401 and S402, judging whether the test phase line is physically connected with the transformer, namely determining the power consumption and user change relationship.
2. The method for determining a power consumer transformation relationship according to claim 1, wherein: in step S100, a clamp meter is used to monitor the current before and after the load phase is loaded.
3. The method for determining a power consumer transformation relationship according to claim 1, wherein: in the step S200, a clamp meter is used on a line of a low-voltage outlet end of the transformer to monitor currents corresponding to a front power supply side and a rear power supply side of the loaded load.
4. The method for determining a power consumer transformation relationship according to claim 1, wherein: in the step 300, synchronous contact is realized by using telephone or interphone.
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| CN110879320A (en) * | 2019-11-05 | 2020-03-13 | 深圳供电局有限公司 | Low-voltage transformer area line-changing user relation identification system and method |
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