1.1 The loss of pressure stealing: the measuring circuit or all of a phase-phase, voltage leads and so removed, so that only the current no-voltage meter. Electricity consumption can not be measured;
1.2 Undervoltage Fault Tolerant: normal electricity measurement, the measurement of the tail voltage sheet should be equal to or measure the actual system voltage circuit voltage are equal, the calculation of active power is equal to actual consumption, such as voltage leads to the introduction of the tail and other virtual access After the introduction of the real value of the voltage meter lower than the actual value, the measurement of the value side of the meter lower than the actual value, aims to achieve a small measure.
1.3ct short circuit: the power process, the ct shorted, making the measurement of loop current flow through short wires no current flow through the meter, the meter does not measure to achieve.
1.4ct Open: in the low-voltage users, the current loop lead removal, that is, the ct open, no current measurement circuit, too, makes the meter does not measure.
1.5 Stream: The main parallel to a shunt in the ct secondary lead, part of the current flow from the metering circuit, the other part of the current flow through the flow through the junction, making the measurement less the purpose of measuring circuit.
1.6 Wiring the wrong phase sequence: changes in the normal phase sequence connection mode, making a phase or all of the active power is negative, so as to achieve the purpose of measuring or less measured. Wrong polarity connection
1.7: Changing the polarity of current transformer into the outlet, the change k1. k2's lead, it reversed the voltage and current angle of 180 degrees to a negative power.
1.8 Other methods: changing the gear ratio meter, such as mechanical dial stuck Power Meter does not charge you. Above, in the measurement circuit in the way of stealing the main method is based on these, so you can use these electrical signals generated by stealing the results of methods and specific technical methods to capture accurate start and end the process of stealing, implementation technology theft electricity.
2 How to take effective measures to prevent tampering
2.1 measured using a dedicated metering cabinet plug loopholes Due to historical reasons, there are many companies without special metering electricity cabinet, power transformer to the secondary connection between the various tables bare, and we found that many users of the transformer is exposed button on the side the current transformer for shorted or disconnected, resulting in less total energy meter or do not count. And some large industries, not only electricity, but also serious pollution production workshop, Measuring Meter counter because there was no special measures are often covered with a thick layer of dust, over time, will seriously affect the accuracy of power meters, and this error is is negative, resulting in our energy supply enterprise revenue. Therefore, no specific measures should be comprehensive clean cabinet companies, using different means to urge the user to achieve the standardization of measuring devices, on the one hand to stealing customers can take advantage of inorganic, but also for energy meter run in a more suitable environment to ensure the stability of the error in the cycle.
2.2 The loss of pressure loading, drying, short-circuit timing device Individuals or individual business interests because of the temptation of power supply enterprise metering device damage using a variety of different means, such as: a, short circuit current transformer secondary circuit or shorted power meter current loop; b, the energy table to lift or man-made voltage circuit voltage transformer fuse blown, causing loss of pressure meter; c, leads directly to the current transformer secondary cut, resulting in a torque-phase component zero. Phenomena in some of the above and the naked eye alone can not be easily perceived. For example, the current multi-rate watt-hour meter used, if a relative loss of pressure, mechanical counter and turn the normal character device, electronic display section displays the normal, another pulse output, if not through special equipment, it is easy to be fooled by appearances. In addition three-phase four-wire active form, if the removal of a short circuit of a phase voltage or phase current, power meter is still being transferred, it is easy to think that it is operating normally. So for all the high part of the high non-specific measure into account the user should be installed cabinets loss of pressure, drying, short-circuit timing device. At present, the Sino-US joint-venture manufacturing jsy-ivb type of loss of pressure, drying, short-circuit timing device, as will access the secondary circuit with a total load impedance of automatic test lock function, when the secondary circuit short-Stream ct, the total impedance value changes, the instrument will trigger the corresponding alarm time counter, until the elimination of short-Stream far, only stop the clock and alarm equipment. Also, when a phase voltage and current below the set value, the timer can be properly timed, to make up for the electricity sector to provide the necessary basis for power. Load Management System
2.3 with dynamic monitoring of the implementation of load The implementation of load management system is to become increasingly prominent in the power supply and demand situation, do not pull power to limit or less pull, load shifting, and improve the power grid load factor. Since collecting data load management system 485 through the meter and pulse interfaces available, with the Energy Meter is correct or close. Therefore, we energy metering and load management should actively cooperate, if a user load curve found abnormal, should take immediate measures aimed at the fastest time in the scene, identify the cause and eliminate hidden dangers, to reduce losses to a minimum . March 2009 Load Management Center told us that city in recent days has been zero load curve of a bank, and the actual match. After that, we immediately rushed to the user, identified by the field staff working for the families is caused by high-voltage fuse pt b-phase fuse, resulting in some loss of power meter display, no pulse output port 485, which is zero load curve . The staff of the household but the delay will be reflected in the above situation to the officer, resulting in leakage of total electricity consumption of about 5000kwh. Causes identified, immediately ordered the household fuse replacement and promptly to restore the power loss.
2.4 to install high-voltage power lines in the measuring tank Due to the current seal clamp in the management of a number of disadvantages, difficult to rule out a power-house staff and stealing household collaboration from within the phenomenon. For example, a metering device deliberately not sealed or deliberately left loopholes for stealing customers to easily stealing, and even stealing some household help stealing electricity directly. In addition, the transformer low voltage side of the line to this section measurement of the bare aluminum cabinet row stealing users can also take advantage of the machine, they are easy to obtain the bare aluminum rafts power without adhering to the measuring meter. For the above reasons. Currently, the city has a lot of power into the line where the end user installation of the transformer high-voltage metering box, the key measurement of a unified case management responsibility to the people. Pressure measurement as part of the assessment, as the charging voltage of the measurement. At the same time two sets of measuring devices on power meter comparison from time to time, once found differences, immediately look for the causes. Practice has proved that this method is indeed effective. With understanding some of the power of the line loss rate of long-term high line, the use of measuring devices to compare two methods, the line loss rate of return to the best historical record. But it is worth mentioning that the high-pressure measuring device because the lack of necessary tests, the error event, everyone's heart may not be very clear, and therefore can calculate the power as a reference only, and can not be used as the basis of total tariff collection, in order to avoid a These aspects result in passive.
3 "combining, both multi-strategy" is the only way to work Fan Qiedian Since the problem is that stealing a comprehensive reflection of various social contradictions, we must take an integrated governance solution.
