CN203551765U - Zero load on-site electric energy meter testing device - Google Patents

Abstract

The utility model discloses a zero-load on-site electric energy meter testing device, which comprises an electric energy meter and a secondary wiring current loop of the electric energy meter. The winding connection is characterized in that a current compensation device is connected in series between one end of the secondary winding of each current transformer and the terminal post of the electric energy meter, the current compensation device includes a multi-turn coil, and the two ends of the multi-turn coil Connect in series between the secondary winding of the current transformer and the terminal of the energy meter. The utility model can carry out wiring inspection and judgment under the condition of zero load, and becomes a test task.

Description

Zero-load on-site electric energy meter test device

technical field

The utility model relates to a device for wiring inspection and electric energy testing of a three-phase intelligent electric energy meter on site of an electric energy metering device. Cooperating with a three-phase electric energy meter on-site calibrator, the utility model solves the inspection and electric energy test of electric energy meter wiring status under the condition of zero load and small current on site, and belongs to the technical field of electric energy test. the

Background technique

At present, due to the limitation of the current test range of the electric energy meter of the existing electric energy meter field calibrator, the wiring inspection of the electric energy meter of the electric energy metering device must be carried out under the condition of load (current). However, in the case of zero load (no current), wiring inspection and judgment are also required to detect possible wiring errors in the electric energy metering device in time to avoid economic losses in power management. the

Utility model content

The technical problem to be solved by the utility model is to provide a device capable of checking and judging the wiring of the electric energy meter under the condition of zero load (no current) of the electric energy metering device. the

In order to solve the above technical problems, the utility model provides a zero-load on-site electric energy meter testing device, including the electric energy meter and the secondary wiring current loop of the electric energy meter. The secondary winding connection of the transformer is characterized in that a current amplifying device is connected in series between one end of the secondary winding of each current transformer and the terminal post of the electric energy meter, and the current amplifying device includes a multi-turn coil, multiple The two ends of the turn coil are connected in series between the secondary winding of the current transformer and the terminal post of the energy meter. the

The aforementioned zero-load on-site watt-hour meter testing device is characterized in that: the current amplification device includes a clamping area of a clamp current transformer for detection and a wiring area, and the wiring area includes a low-end interface and at least one high-end interface. The end interface is connected with each high-end interface through a plunger. the

The aforementioned zero-load on-site electric energy meter testing device is characterized in that: the current amplifying device is arranged in a joint junction box. the

The working principle of the utility model is:

The current sampling of the electric energy meter field calibrator generally adopts the clamp current transformer method, and the field wiring is convenient and fast. The working principle of the clamp ammeter is based on the working principle of the current transformer. When the wrench of the clamp ammeter is held tightly, the iron core of the current transformer can be opened, and the wire of the measured current enters the inside of the jaw as the current transformer. primary winding. When the iron core of the loose wrench is closed, an induced current is generated on the secondary winding according to the principle of the transformer. The device of the utility model adopts the working principle mode of the current transformer to amplify the current of the current loop of the electric energy metering device, and meets the test requirements of the field calibrator of the electric energy meter. the

According to the analysis and research on the working principle of the current transformer (I2=(N1/N2)*I1), when there is no load in the power transmission, the no-load current (I1) when the power line is charged can be used, that is, the series in the secondary current loop Connect a ring coil with N turns to amplify the capacitive current of the power transmission line or the excitation current of the transformer by N times to meet the requirements of the electric energy meter field calibrator, and complete the wiring inspection and judgment of the metering device under zero load. Realize the first inspection immediately at the power transmission site. This eliminates the need to wait until there is an actual load to test. the

The beneficial effects achieved by the utility model: the device of the utility model cooperates with the field calibrator of the electric energy meter without load, and only needs to be equipped with such a device, and the wiring inspection and judgment can be carried out under the condition of zero load, and the test task can be completed, thereby Timely discover the possible wiring errors of the electric energy metering device to avoid the economic loss of electric power operation. At the same time, the utilization rate of existing equipment can be effectively improved, and the cost of production can be reduced. The utility model can be widely used in on-site detection of electric energy metering devices. the

Description of drawings

Figure 1 is a schematic diagram of the current coil winding of the current clamp ammeter;

Fig. 2 is the schematic diagram of the current coil winding arrangement of the utility model pincer ammeter;

Fig. 3 is a schematic diagram of the utility model current amplification device;

Fig. 4 is the external view of the current amplifying device of the present utility model;

Fig. 5 is a structural schematic diagram of a zero-load on-site electric energy meter testing device of the present invention. the

Detailed ways

As shown in Figure 1, the main component of the clamp ammeter is a through-core current transformer. When measuring, the magnet 2 of the clamp ammeter is placed on the measured wire to form a primary coil 3 of one turn, using the principle of electromagnetic induction , the induced current will be generated in the secondary coil 1 of the clamp ammeter. the

If the number of turns of the primary current is increased, the turns ratio of the clamp transformer can be changed, and the output of the secondary current can be increased under the condition that the primary current is equal. As shown in Figure 2, the open magnet 2 of the clamp meter is clamped in a multi-strand annular coil 4, and the number of primary turns can be changed to increase the output amplitude of the secondary current to meet the current sampling and testing of the on-site calibrator. the

According to this principle, a current coil device with N turns is connected in series in the current loop of the electric energy metering device, and the clamp of the clamp current transformer of the on-site calibrator is clamped on the coil of the device. The ampere-turns of the primary current of the clamp current transformer is enlarged by N times. It is equivalent to the current value of the current loop of the electric energy metering device being enlarged by N times, and the current input to the on-site calibrator is then enlarged by N times. the

Fig. 3 is a schematic diagram of the current amplifying device of the present invention. Connect the current supplementary amplifier device in series in the secondary circuit circuit of the electric energy meter, including a low-end interface and at least one high-end interface. In this embodiment, three high-end connection terminals are provided. The high and low ends can be connected in series in the current loop of the electric energy metering device. The high end is divided into three optional magnifications (two times, five times and ten times). Select the corresponding magnification according to the current situation on site and connect the corresponding wiring The terminals are connected in series. the

FIG. 4 is an outline view of the current amplifying device of the present invention. It is divided into clamping area of clamp current transformer and wiring area, and the clamping area can meet clamping current transformers of various specifications of jaws. There are three groups in the wiring area, which are 1000%, 500% and 200% terminal interfaces. When in use, connect the wire to the secondary current circuit of the electric energy meter through the φ4 plug. the

Fig. 5 is a schematic structural diagram of the zero-load on-site electric energy meter testing device of the present utility model. In the electric energy meter secondary wiring current loop, the electric energy meter terminal is connected with the secondary winding 7 of the current transformer through a wire, and the current is passed through the connecting wire during detection. The amplifying device 8 is installed in the combined junction box 6, and the current amplifying device is connected to the current circuit of the electric energy metering device, and then the current connecting piece of the combined junction box 6 is opened to allow the current to flow through the current amplifying device 8, and the on-site calibration The clamp of the clamp current transformer of the instrument is clamped on the clamping area of the current amplification device 8 . the

Claims (3)

1. A zero-load on-site electric energy meter testing device, including the electric energy meter and the electric energy meter secondary wiring current loop, in the electric energy meter secondary wiring current loop, the electric energy meter terminal is connected with the secondary winding of the current transformer through a wire, It is characterized in that a current amplifying device is connected in series between one end of the secondary winding of each current transformer and the terminal post of the electric energy meter, the current amplifying device includes a multi-turn coil, and the two ends of the multi-turn coil are connected in series. Between the secondary winding of the current transformer and the terminal of the energy meter. 2. The zero-load on-site watt-hour meter testing device according to claim 1, characterized in that: the current amplifying device includes a clamping area of a clamp current transformer for detection and a wiring area, and the wiring area includes a low-end interface and at least one high-end interface, and the low-end interface is connected with each high-end interface through a plunger. 3. The zero-load on-site electric energy meter testing device according to claim 2, characterized in that: the current amplifying device is arranged in a joint junction box.

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