CN212658814U

CN212658814U - Passive power secondary circuit wiring inspection system

Info

Publication number: CN212658814U
Application number: CN202021284889.8U
Authority: CN
Inventors: 曹磊; 张伍
Original assignee: HANGZHOU PUAN TECHNOLOGY CO LTD
Current assignee: HANGZHOU PUAN TECHNOLOGY CO LTD
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-03-05
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a passive electric power secondary circuit inspection system that works a telephone switchboard, send and the sampling end and detect the service end including three-phase alternating current signal, three-phase alternating current signal send and the sampling end is including measurement return circuit incoming line side, one side electric connection of measurement return circuit incoming line side has the program-controlled source of low pressure alternating current, voltage transformer is passed through to the opposite side of measurement return circuit incoming line side, current transformer secondary binding post has measurement return circuit table side through secondary wire electric connection, one side electric connection of measurement return circuit table side has the low pressure to exchange and detects the table, electric connection has two sampling communication units between low pressure exchange detection table and the program-controlled source of low pressure. The utility model discloses whole process only needs disposable wiring, does not destroy original construction wiring, alright directly differentiate wiring and transformation ratio problem in the measurement return circuit, has reduced investigation personnel's work flow and working strength greatly, has also saved a large amount of times simultaneously.

Description

Passive power secondary circuit wiring inspection system

Technical Field

The utility model relates to an electricity measures technical field, in particular to passive electric power secondary circuit wiring inspection system.

Background

According to the operation flow of new electric power installation and capacity increase users, measurement installation and electricity utilization inspection personnel of enterprises needing power supply before power transmission check and accept the new installation of a measurement loop on site, and check whether the wiring of the measurement loop is correct:

(1) the operation requirements are as follows: after the wiring of the metering loop is installed and before power is transmitted, the wiring accuracy of the secondary wiring terminal of the mutual inductor to the wiring box, the electric energy meter and the collecting terminal of the whole metering loop needs to be checked;

(2) the current situation is as follows: before and after an inspector measures a cabinet, a universal meter is adopted to measure whether a connecting wire of a secondary connecting terminal of a mutual inductor is correctly connected or not, and if the secondary connecting terminal of the current mutual inductor (CT) needs to be unscrewed and disconnected by a connecting screw, the measurement is carried out;

(3) the problems that exist are that: firstly, because the measuring cabinet is narrow in space, dark in light and difficult in screw dismounting, the measuring cabinet needs to be mounted after checking one line, and the mounting is not firm; secondly, the labor intensity of measurement installation personnel is high, and whether the actual transformation ratio of the mutual inductor is consistent with the information of the mounting order or not can not be checked on site.

The existing line detection method is directly judged by using the on-off detection buzzing gear of the multimeter, the method needs to disconnect and measure at least one end of an incoming line of the electric energy meter from the secondary side of a voltage transformer (PT) and/or a Current Transformer (CT), the operation is very troublesome, new potential safety hazards are generated, the actual transformation ratio of the installed mutual inductor cannot be effectively judged, and the situation that the electric quantity is less due to the fact that bad users replace name plates of the current transformer is effectively avoided.

The invention mainly solves the problems that the current wiring inspection and acceptance inspection of a power consumer in the new installation and capacity increase construction process are complex and inefficient, and the accuracy of the transformation ratio of a transformer cannot be ensured, and provides a wiring detection system and method for an uncharged metering loop.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a passive electric power secondary circuit wiring inspection system to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a passive electric power secondary circuit inspection system that works a telephone switchboard, includes three-phase alternating current signal transmission and sampling end and detection service end, its characterized in that, three-phase alternating current signal transmission is equipped with the detection service end with one side of sampling end, three-phase alternating current signal transmission and sampling end are including measurement return circuit admission line side, one side electric connection of measurement return circuit admission line side has the program-controlled source of low pressure alternating current, the opposite side of measurement return circuit admission line side has measurement return circuit table side through voltage transformer, current transformer secondary wiring terminal through secondary wire electric connection, one side electric connection of measurement return circuit table side has the low pressure to exchange and detects the table.

Preferably, two sampling communication units are electrically connected between the low-voltage alternating-current detection meter and the low-voltage alternating-current program control source.

Preferably, the detection server includes a detection communication unit, a hexagonal phasor diagram generation unit, a connection fault analysis unit and a PT/CT transformation ratio comparison unit, the hexagonal phasor diagram generation unit is electrically connected with the detection communication unit, the connection fault analysis unit is electrically connected with the detection communication unit, and the PT/CT transformation ratio comparison unit is electrically connected with the detection communication unit respectively.

Preferably, the detection communication unit is wirelessly connected with the sampling communication unit.

The utility model discloses a technological effect and advantage:

(1) injecting three-phase band phase alternating voltage and current signals into a primary side of a metering loop transformer by using a low-voltage program control signal source, accessing an alternating current detection module into a metering secondary loop at the side of an electric energy meter, wherein the alternating current detection module can measure the voltage and current signals injected into a circuit and output to the electric energy meter, the alternating current program control source and the alternating current detection module send respective measured electric parameter data information to a handheld terminal through Bluetooth communication, judging whether wiring errors exist or not by an APP of the handheld terminal according to a hexagonal phase diagram generated by measured data, and calculating actual transformation ratios of the voltage current transformer at the measured primary voltage, secondary voltage and current values to judge whether PT/CT transformation ratios are abnormal or not according to single-connection information;

(2) the whole process only needs one-time wiring, the original construction wiring is not damaged, the wiring and transformation ratio problems in the metering loop can be directly judged, the working process and the working strength of the inspectors are greatly reduced, and meanwhile, a large amount of time is saved.

Drawings

FIG. 1 is a block diagram of the present invention for detecting the wiring of a no-load metering loop.

In the figure: 1. a three-phase alternating current signal transmitting and sampling end; 11. a low voltage ac program control source; 12. a low-voltage alternating current detection meter; 13. a sampling communication unit; 2. detecting a server; 21. detecting a communication unit; 22. a hexagonal phasor diagram generation unit; 23. a wiring fault analysis unit; 24. PT/CT contrast comparison unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a passive electric power secondary circuit inspection system that works a telephone switchboard as shown in figure 1, including three-phase alternating current signal transmission and sampling end 1 and detection service end 2, three-phase alternating current signal transmission and sampling end 1 include measurement circuit incoming line side, one side electric connection of measurement circuit incoming line side has low pressure alternating current program control source 11, the other side of measurement circuit incoming line side passes through voltage transformer (PT), Current Transformer (CT) secondary terminal block has measurement circuit meter side through secondary wire electric connection, one side electric connection of measurement circuit meter side has low pressure alternating current detection meter 12, electric connection has two sampling communication units 13 between low pressure alternating current detection meter 12 and the low pressure alternating current program control source 11;

the detection service end 2 comprises a detection communication unit 21, a hexagonal phasor diagram generation unit 22, a connection fault analysis unit 23 and a PT/CT transformation ratio comparison unit 24, wherein the hexagonal phasor diagram generation unit 22, the connection fault analysis unit 23 and the PT/CT transformation ratio comparison unit 24 are respectively electrically connected with the detection communication unit 21, and the detection communication unit 21 is wirelessly connected with the sampling communication unit 13.

The utility model discloses the theory of operation:

the method comprises the following steps: the low-voltage alternating-current program-controlled signal source is controlled to output three-phase alternating-current voltage and current signals with phases and inject the three-phase alternating-current voltage and current signals into the primary side of the metering transformer, the alternating-current program-controlled signal source adopts a digital sine wave generation technology to realize 3600 point data generated by each cycle wave during fundamental wave output, a parallel input low-noise digital-to-analog converter is adopted to convert sine wave signals, and an SPWM audio power amplifier driving technology is adopted to output three-phase low-voltage and low-;

step two: exchange detection module and gather measurement secondary circuit ammeter side voltage, electric current and phase information in real time, exchange detection module and adopt and to guarantee 6000: 1, accurately detecting voltage, current and phase data of a metering loop circuit side by a metering chip with the dynamic range accuracy of 0.1%;

step three: the wiring fault analysis unit calculates according to the category of the metering loop and the collected data, compares the data with a built-in criterion base of wrong wiring, and judges that the wiring which meets the correct wiring condition belongs to the correct wiring, and the wiring which meets the wrong wiring condition can be judged as a wiring error, wherein the fault analysis operation steps of the medium wiring fault analysis unit are as follows:

a 1: arranging each amplitude and phase data according to the preset wiring type (three-phase three-wire or three-phase four-wire) of the metering loop;

a 2: comparing the voltage amplitude data and the current amplitude data with the voltage amplitude and the current amplitude of the two adjacent phases, searching for an open-phase fault in a criterion database, if so, finishing the judgment, and if not, continuing to execute the next step;

a 3: the phase data with the well-arranged phase sequence is searched for a corresponding phase in a criterion database, and the category of the wiring fault can be directly obtained;

step four: the PT/CT transformation ratio comparison unit compares and judges the correctness of the transformation ratio of the mutual inductor according to the acquired data and the information data of the mounting list, and the method comprises the following specific steps:

b 1: calculating respective transformation ratio according to preset parameters of a voltage transformer (PT) and a Current Transformer (CT);

b 2: calculating the ratio difference and the angle difference of each phase voltage, the ratio difference and the angle difference of each phase current on the inlet side and the ammeter side;

b 3: judging the condition that the primary and secondary angular differences of PT and CT are within the error range, if the angular differences are out of tolerance, directly judging the error, otherwise, continuously executing the next step;

b 4: the first and second order differences of PT and CT and the respective transformation ratios calculated in step 1d1 are judged to be within the error range, and if the differences exceed the error, a transformation ratio error is judged.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses the standard parts that use all can purchase from the market, and dysmorphism piece all can be customized according to the record of the description with the drawing.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a passive electric power secondary circuit inspection system that works a telephone switchboard, includes three-phase alternating current signal transmission and sampling end (1) and detection service end (2), its characterized in that, three-phase alternating current signal transmission is equipped with detection service end (2) with one side of sampling end (1), three-phase alternating current signal transmission and sampling end (1) are including measurement return circuit route side, one side electric connection of measurement return circuit route side has low pressure to exchange programme-controlled source (11), the opposite side of measurement return circuit route side has measurement return circuit table side through voltage transformer, current transformer secondary wiring terminal through secondary wire electric connection, one side electric connection of measurement return circuit table side has low pressure to exchange and detects table (12).

2. The system of claim 1, wherein two sampling communication units (13) are electrically connected between the low-voltage AC detection meter (12) and the low-voltage AC programmable power supply (11).

3. The system for checking the wiring of the passive power secondary circuit according to claim 1, wherein the detection service terminal (2) comprises a detection communication unit (21), a hexagonal phasor diagram generation unit (22), a wiring fault analysis unit (23) and a PT/CT transformation ratio comparison unit (24), the hexagonal phasor diagram generation unit (22) is electrically connected with the detection communication unit (21), the wiring fault analysis unit (23) is electrically connected with the detection communication unit (21), and the PT/CT transformation ratio comparison unit (24) is electrically connected with the detection communication unit (21).

4. A passive power secondary loop wiring inspection system according to claim 3, characterized in that the detection communication unit (21) is wirelessly connected with the sampling communication unit (13).