CN113126002B - Method for detecting installation mode of building electrical system - Google Patents
Method for detecting installation mode of building electrical system Download PDFInfo
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- CN113126002B CN113126002B CN202110373231.7A CN202110373231A CN113126002B CN 113126002 B CN113126002 B CN 113126002B CN 202110373231 A CN202110373231 A CN 202110373231A CN 113126002 B CN113126002 B CN 113126002B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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Abstract
The invention relates to the field of electric system detection, in particular to a detection method for a building electric system installation mode. The method can specifically detect the error of which installation mode of the current collector to be detected (the current transformer to be detected), and can know whether the current transformer to be detected has any one or any two of a zero line non-penetration, a zero line reverse penetration and an A-phase live wire, a B-phase live wire and a C-phase live wire. Through the analysis, the detection method can distinguish various wrong installation modes of the current transformer to be detected, so that maintenance personnel can adjust the wrong installation modes of the current transformer to be detected in a targeted manner.
Description
Technical Field
The invention relates to the field of electric system detection, in particular to a detection method for a building electric system installation mode.
Background
The building electrical system comprises a second-stage power supply circuit and a third-stage power supply circuit, wherein the second-stage power supply circuit is a three-phase four-wire system (three fire and one zero, namely an A-phase fire wire, a B-phase fire wire, a C-phase fire wire and a zero wire N), and the third-stage power supply circuit is a branch of the second-stage power supply circuit and is divided into three fire and zero wire combinations (1P open).
In order to monitor the electrical system of the building in real time, current transformers are arranged on an A-phase live wire, a B-phase live wire, a C-phase live wire and a zero line N.
When the current transformer is installed, the current transformer is installed incorrectly due to misoperation or installation according to an operation flow specified in a technical manual. If the current transformer cannot be timely known to be installed wrongly, the current transformer can be caused to work abnormally, and therefore the function of the current transformer is lost.
Disclosure of Invention
In order to solve the technical problem, the invention provides a detection method for the installation mode of a building electrical system, which can timely know whether a current transformer is installed wrongly.
In order to achieve the purpose, the invention adopts the following technical scheme:
a detection method for the installation mode of a building electrical system comprises the following steps of obtaining whether a zero line N on a current collector to be detected is installed correctly or not:
s1, collecting current I on A-phase live wire A Current on B phase live wire I B Current on C-phase live wire I C (ii) a The A-phase live wire, the B-phase live wire, the C-phase live wire and the zero line N are all connected with a current collector to be detected;
s2, calculating theoretical current I 'on zero line N where current collector to be detected is located' N ：
S3, if any one of the conditions of the step Sa1 and the step Sa2 occurs, the zero line N on the current collector to be detected is installed wrongly, otherwise, the zero line N on the current collector to be detected is installed correctly;
sa1, acquiring the current output by the current collector to be detected, and marking as I; if I belongs to [ I' N -Δ，I′ N +Δ]If delta is a first error value, the zero line N on the current collector to be detected is not penetrated, otherwise, the step Sa2 is carried out;
sa2, if I is ∈ [2 × I' N -Δ，2×I′ N +Δ]And the zero line N on the current collector to be detected is reversed.
Further, the detection method also comprises the steps of obtaining whether the live wires on the current collector to be detected are correctly installed, wherein the live wires on the current collector to be detected comprise an A-phase live wire, a B-phase live wire and a C-phase live wire;
if any one of the conditions of the step Sb1 and the step Sb2 occurs, the installation of the live wire on the current collector to be detected is wrong, otherwise, the installation of the live wire on the current collector to be detected is correct;
the specific steps for detecting the installation error of the live wire on the current collector to be detected are as follows:
sb1, theoretical Current I' N If the current is zero, the phase A live wire, the phase B live wire and the phase C live wire on the current collector to be detected do not penetrate, otherwise, the step Sb2 is carried out;
sb2, if I is ∈ [ I ] A -Δ，I A +Δ]If the current collector to be detected only has the A-phase live wire not to pass through;
if I belongs to [ I ] B -Δ，I B +Δ]If the current collector to be detected only has the B-phase live wire not to pass through;
if I belongs to [ I ] C -Δ，I C +Δ]If the current collector to be detected is not penetrated by the C-phase live wire, only the C-phase live wire is arranged on the current collector to be detected;
if it is
Only the phase A live wire and the phase B live wire are not penetrated on the current collector to be detected;
if it is
Only the A-phase live wire and the C-phase live wire are not penetrated on the current collector to be detected;
if it is
Further, the detection method also comprises the steps of acquiring whether the zero line N in the two paths of building electrical systems is installed in a crossed manner; the two paths of building electrical systems are respectively marked as a first path and a second path, and the first path building electrical system and the second path building electrical system respectively comprise an A-phase live wire, a B-phase live wire, a C-phase live wire and a zero line N;
the zero line N is installed in a cross mode and comprises a zero line N of a first road borrowed by a second road and a zero line N of the first road borrowed by the second road;
phase A live wire, phase B live wire, phase C live wire and zero line N in step S1 and step S2Theoretical current I 'of zero line N' N Are all positioned in an electrical system of the first-way building;
obtaining an actual current I on a zero line N in an electrical system of a first-way building N ；
The method for detecting whether the zero line N is installed in a cross mode comprises the following steps:
sc1, if I' N ∈[I N -Δ′，I N +Δ′]If delta' is a second error value, the zero line N is not installed in a cross mode, namely the zero line N is installed correctly, and otherwise, the step Sc2 is carried out;
sc2, if I' N ＞I N + delta', the zero line N of the second road is borrowed in the first road;
if l' N ＜I N + Δ', the zero line N of the first route is borrowed by the second route.
Further, the first current sampler sleeved on the A-phase live wire is used for collecting current I A (ii) a Collecting current I by a second current sampler sleeved on a B-phase live wire B (ii) a Collecting current I by a third current sampler sleeved on a C-phase live wire C 。
Further, the first current sampler, the second current sampler and the third current sampler are all current transformers.
Further, the value of Δ is 50mA.
Further, the value of Δ' was 500mA.
Further, the current collector to be detected is a current transformer.
The invention has the following beneficial effects:
(1) If the current transformer to be detected is installed wrongly, the current transformer to be detected can cause false alarm due to inaccurate collected residual current.
The detection method can detect whether the installation mode of the current transformer to be detected is wrong or not in time, and is convenient for maintenance personnel to maintain in time, so that the current transformer to be detected is prevented from working in the wrong installation mode, and the problems are avoided.
(2) The method can specifically detect the error of which installation mode the current collector to be detected (the current transformer to be detected) is, and can know whether the current transformer to be detected has any one or any two of a zero line which is not penetrated, a reverse zero line which is penetrated and an A-phase live wire, a B-phase live wire and a C-phase live wire which are not penetrated.
Through the analysis, the detection method can distinguish various wrong installation modes of the current transformer to be detected, so that maintenance personnel can adjust the wrong installation modes of the current transformer to be detected in a targeted manner.
For example, if the wrong installation mode detected is only that the phase a live wire is not passed through, and no other wrong installation mode exists, the maintenance personnel only need to pass the phase a live wire through the current transformer to be detected in a targeted manner, and the installation mode of the current transformer to be detected becomes the correct installation mode. And whether the installation errors of the B-phase live wire, the C-phase live wire and the zero wire are caused or not does not need to be checked on site, so that the workload of maintenance personnel is reduced, and the maintenance effect is also improved.
(3) Zero-line crossing causes two problems: 1. the current collector to be detected frequently gives an alarm (equipment frequently has residual current), so that a false alarm phenomenon is caused; 2. after a certain system is switched off (without power), the zero line of the system is still electrified, so that people get an electric shock and further casualty accidents occur.
The detection method can also detect whether the zero lines between two mutually independent building electrical systems have a wrong installation mode of cross installation or not so as to avoid the problems.
Drawings
FIG. 1 is a block diagram of the electrical system of the building of the present invention;
FIG. 2 is a flow chart of the present invention.
The notations in the figures have the following meanings:
1-first current sampler 2-second current sampler 3-third current sampler
4-fourth current sampler 5-current to be detected collector 6-3P breaker 7-IP air switch
Detailed Description
The technical scheme of the invention is clearly and completely described below by combining the embodiment and the attached drawings of the specification. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the building electrical system includes three live wires (a-phase live wire, B-phase live wire, C-phase live wire) and one zero wire (zero wire N), the three live wires are mounted with the 3P circuit breaker 6 and the IP air switch 7 side by side, and the three live wires and the zero wire are used for connecting a load (power consumption device) at the end of the IP air switch 7 away from the 3P circuit breaker 6. A first current sampler 1 is arranged between the 3P circuit breaker 6 and the IP air switch 7 on the A-phase live wire and is used for collecting current I on the A-phase live wire A (ii) a A second current sampler 2 is arranged between the 3P circuit breaker 6 and the IP air switch 7 on the B-phase live wire and is used for collecting the current I on the B-phase live wire B (ii) a A third current sampler 3 is arranged between the 3P circuit breaker 6 and the IP air switch 7 on the C-phase live wire and is used for collecting the current I on the C-phase live wire C (ii) a The building electrical system further comprises a current collector to be detected 5, and the current collector to be detected 5 is connected with the three live wires and the zero wire N. The current collector 5 to be detected is used for collecting the residual current of the whole building electrical system.
The detection method comprises three independent technical schemes which can be combined with each other for use, and as shown in fig. 2, the three technical schemes are respectively used for obtaining whether the zero line N of the current collector 5 to be detected is installed wrongly, obtaining whether the three live wires of the current collector 5 to be detected are installed wrongly, and obtaining whether the zero line N on the building electrical system where the current collector 5 to be detected is located is installed wrongly with the zero lines N on other building electrical systems. These are described below:
the method for acquiring whether the zero line N of the current collector 5 to be detected is installed wrongly comprises the following steps:
s1, collecting current I on A-phase live wire A Current on B phase live wire I B Current on C-phase live wire I C (ii) a The phase A live wire, the phase B live wire, the phase C live wire and the zero line N are all connected with a current collector 5 to be detected;
s2, calculating theoretical current I 'on zero line N where current collector 5 to be detected is located' N ：
S3, if any one of the conditions of the step Sa1 and the step Sa2 occurs, the zero line N on the current collector 5 to be detected is installed wrongly, otherwise, the zero line N on the current collector 5 to be detected is installed correctly;
sa1, acquiring the current output by the current collector 5 to be detected, and recording the current as I; if I belongs to [ I' N -Δ，I′ N +Δ]If delta is a first error value and the value of delta is 50mA, the zero line N on the current collector 5 to be detected does not penetrate, and if not, the step Sa2 is performed;
sa2, if I is ∈ [2 × I' N -Δ，2×I′ N +Δ]And the zero line N on the current collector 5 to be detected passes through reversely.
The zero line N is reversely penetrated, that is, the zero line on the left side of the current collector 5 to be detected is connected to the right side as shown in fig. 1, and the zero line on the right side of the current collector 5 to be detected is connected to the left side.
Whether the three live wires of the current collector 5 to be detected are installed wrongly or not is obtained, and the method comprises the following steps:
s1, collecting current I on A-phase live wire A Current on B phase live wire I B Current on C-phase live wire I C (ii) a The A-phase live wire, the B-phase live wire, the C-phase live wire and the zero line N are all connected with a current collector 5 to be detected;
s2, calculating theoretical current I 'on zero line N where current collector 5 to be detected is located' N ：
S3, if any one of the conditions of the step Sb1 and the step Sb2 occurs, the installation of the live wire on the current collector 5 to be detected is wrong, otherwise, the installation of the live wire on the current collector 5 to be detected is correct;
the specific steps for detecting the installation error of the live wire on the current collector 5 to be detected are as follows:
sb1, theoretical Current I' N If the number is zero, the phase A live wire, the phase B live wire and the phase C live wire on the current collector 5 to be detected are not penetrated, otherwise, the step Sb2 is carried out, and the live wire is not penetrated, namely the live wire is not connected with the current collector to be detected;
sb2, if I is E [ I ] A -Δ，I A +Δ]If the current collector 5 to be detected only has the phase A live wire not to pass through;
if I belongs to [ I ] B -Δ，I B +Δ]If the current collector 5 to be detected only has the B-phase live wire not to pass through;
if I belongs to [ I ] C -Δ，I C +Δ]If the current collector 5 to be detected only has the C-phase live wire not to pass through;
if it is
Only the phase A live wire and the phase B live wire are not penetrated on the current collector 5 to be detected;
if it is
Only the phase A live wire and the phase C live wire on the current collector 5 to be detected are not penetrated;
if it is
And acquiring whether the zero line N on the building electrical system where the current collector 5 to be detected is positioned is installed in error with the zero lines N on other building electrical systems.
The two paths of building electrical systems are respectively marked as a first path and a second path, and the first path building electrical system and the second path building electrical system respectively comprise an A-phase live wire, a B-phase live wire, a C-phase live wire and a zero line N;
the zero line N is installed in a crossed manner, wherein the zero line N of the first road is borrowed by the second road and the zero line N of the first road is borrowed by the second road;
theoretical currents I 'of A-phase live wire, B-phase live wire, C-phase live wire, zero line N and zero line N where current collector 5 to be detected is located' N Are all positioned in an electrical system of the first-way building;
obtaining an actual current I on a zero line N in an electrical system of a first-way building N ；
The method for detecting whether the zero line N is installed in a cross mode comprises the following steps:
sc1, if I' N ∈[I N -Δ′，I N +Δ′]If delta 'is a second error value and the value of delta' is 500mA, the zero line N is not installed in a crossed mode, namely the zero line N is installed correctly, and otherwise, the step Sc2 is carried out;
sc2, if I' N ＞I N + delta', the zero line N of the second road is borrowed in the first road;
if l' N ＜I N And + delta', the zero line N of the first road is borrowed by the second road.
The first current sampler 1, the second current sampler 2, the third current sampler 3 and the current collector 5 to be detected are all current transformers, the first current sampler 1 is CTKD-16 in model, the second current sampler 2 is CTKD-16 in model, the third current sampler 3 is CTKD-16 in model, and the current collector 5 to be detected is ZT-30P in model.
Example 1
And (3) a diagnosis condition model of reverse penetration of the zero line, no penetration of the zero line and the like:
the range of the current collector 5 to be detected of the intelligent electric equipment is 0-3000 mA, and once the range exceeds 3000mA, the error of residual current (the current collector 5 to be detected is used for acquiring the residual current in an electric system of a building) is larger; and considering the error between the calculated value and the actual sampling value, the precondition is set as follows:
the ABC currents are all less than 3A (3A modifiable).
And taking the day as a unit, taking hit on three continuous days as the standard (3 days can be modified), namely detecting results of the three continuous days that the zero line passes through the reverse direction or does not pass through, and judging that the actual situation is that the zero line passes through the reverse direction or does not pass through.
In one day, 50 consecutive hits qualify (50 are modifiable).
Calculated l' N The error can not exceed 3A, and the exceeding error is large;
the parenthesis content can be modified according to actual conditions, such as large calculation amount or large error of the result, and can be changed.
As shown in Table 1, the current of the A-phase live wire, the current of the B-phase live wire, the current of the C-phase live wire, and the theoretical current value I 'of the zero wire are shown when the zero wire is reversely passed' N And the current I output by the current collector 5 to be detected.
TABLE 1
As shown in Table 2, the current of the A-phase live wire, the current of the B-phase live wire, the current of the C-phase live wire, and the theoretical current value I 'of the zero wire are shown when the zero wire is reversely passed' N And the current I output by the current collector 5 to be detected.
TABLE 2
Example 2
As shown in Table 3, the current values of the phase A live wire, the phase B live wire, the phase C live wire and the theoretical current value I 'of the neutral wire when neither A nor B nor C was passed' N And the current I output by the current collector 5 to be detected.
As shown in Table 4, the current of the phase A live wire, the current of the phase B live wire, the current of the phase C live wire and the theoretical current value I 'of the neutral wire are shown when both A and C are not passed therethrough' N And the current I output by the current collector 5 to be detected.
TABLE 3
TABLE 4
Claims (5)
1. A detection method for the installation mode of a building electrical system is characterized by comprising the following steps of obtaining whether a zero line N on a current collector (5) to be detected is installed correctly or not:
s1, collecting current I on A-phase live wire A Current on B phase live wire I B Current on C-phase live wire I C (ii) a The phase A live wire, the phase B live wire, the phase C live wire and the zero line N are all connected with a current collector (5) to be detected;
s2, calculating theoretical current I 'on zero line N where current collector (5) to be detected is located' N ：
S3, if any one of the conditions of the step Sa1 and the step Sa2 occurs, the zero line N on the current collector (5) to be detected is installed wrongly, otherwise, the zero line N on the current collector (5) to be detected is installed correctly;
sa1, acquiring the current output by the current collector (5) to be detected, and marking as I; if I belongs to [ I' N -Δ，I′ N +Δ]If delta is a first error value, the zero line N on the current collector (5) to be detected does not pass through, otherwise, the step Sa2 is carried out;
sa2, if I belongs to [2 × I' N -Δ，2×I′ N +Δ]If the zero line N on the current collector (5) to be detected is reversed, the zero line N is connected with the zero line N;
the detection method further comprises the steps of obtaining whether the live wire on the current collector (5) to be detected is installed correctly or not, wherein the live wire on the current collector (5) to be detected comprises an A-phase live wire, a B-phase live wire and a C-phase live wire;
if any one of the conditions of the step Sb1 and the step Sb2 occurs, the installation of the live wire on the current collector (5) to be detected is wrong, otherwise, the installation of the live wire on the current collector (5) to be detected is correct;
the specific steps for detecting the installation error of the live wire on the current collector (5) to be detected are as follows:
sb1, theoretical Current I' N If the current is zero, the phase A live wire, the phase B live wire and the phase C live wire on the current collector (5) to be detected do not penetrate, and if not, the step Sb2 is carried out;
sb2, if I is E [ I ] A -Δ，I A +Δ]Only the A-phase live wire does not pass through the current collector (5) to be detected;
if I belongs to [ I ] B -Δ，I B +Δ]Only the B-phase live wire on the current collector (5) to be detected does not pass through;
if I belongs to [ I ] C -Δ，I C +Δ]Only the C-phase live wire on the current collector (5) to be detected does not pass through;
if it is
Only the phase A live wire and the phase B live wire are not penetrated on the current collector (5) to be detected;
if it is
Only the A-phase live wire and the C-phase live wire are not penetrated on the current collector (5) to be detected;
if it is
the detection method also comprises the steps of acquiring whether the zero line N in the two building electrical systems is installed in a cross way; the two paths of building electrical systems are respectively marked as a first path and a second path, and the first path and the second path respectively comprise an A-phase live wire, a B-phase live wire, a C-phase live wire and a zero line N;
the zero line N is installed in a cross mode and comprises a zero line N of a first road borrowed by a second road and a zero line N of the first road borrowed by the second road;
theoretical currents I 'of phase A live wire, phase B live wire, phase C live wire, zero wire N in step S1 and zero wire N in step S2' N Are all located on the first road buildingIn an electrical system;
obtaining the actual current I on the zero line N in the first road N ；
The method for detecting whether the zero line N is installed in a cross mode comprises the following steps:
sc1, if I' N ∈[I N -Δ′，I N +Δ′]If delta' is a second error value, the zero line N is not installed in a crossed manner, namely the zero line N is installed correctly, otherwise, the step Sc2 is carried out;
sc2, if I' N ＞I N + delta', the zero line N of the second road is borrowed in the first road;
if l' N ＜I N + delta', the zero line N of the first road is borrowed by the second road;
the current I is collected by a first current sampler (1) sleeved on an A-phase live wire A (ii) a The current I is collected by a second current sampler (2) sleeved on the B-phase live wire B (ii) a The current I is collected by a third current sampler (3) sleeved on the C-phase live wire C 。
2. The method for detecting the installation of an electrical system of a building as claimed in claim 1, wherein: the first current sampler (1), the second current sampler (2) and the third current sampler (3) are all current transformers.
3. The method for detecting the installation mode of the electrical system of a building according to claim 1, wherein: the value of Δ is 50mA.
4. The method for detecting the installation mode of the electrical system of a building according to claim 1, wherein: the value of Δ' was 500mA.
5. The method for detecting the installation mode of the electrical system of a building according to claim 1, wherein: the current collector (5) to be detected is a current transformer.
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