CN203191536U - A voltage monitor comparison device - Google Patents

Abstract

Disclosed in the utility model is a voltage monitor comparison apparatus that comprises a voltage monitor and a junction box. 220-V, 100-V and 380-V voltage input terminal interfaces are arranged in the junction box; a transformer is arranged between the junction box and the voltage monitor. And the 220-V, 100-V and 380-V voltage input terminal interfaces are connected with a common resistance wire at one end of the transformer. With utilization of the scheme, power supplies with different voltage levels can be provided during the running and maintenance process of the voltage monitor and thus reliably and secure power supplies can be provided for repairing and operation maintenance of the voltage monitor. Therefore, the provided apparatus has the good technological merit.

Description

A voltage monitor comparison device

technical field

The utility model relates to the operation and maintenance work of a voltage monitor. The device is mainly used for providing power supply, voltage measurement, and time value comparison for the maintenance and detection of the voltage monitor.

Background technique

The economical, safe and stable operation of the power grid requires voltage quality monitoring. All substations and typical representative users are equipped with voltage monitors. Voltage monitors are prone to failure after long-term operation. Therefore, power supply companies need voltage monitors to detect power supplies and comparison devices. Generally, a small transformer (with 100V and 380V output terminals) connected to a 220V working power supply is used to provide power, a clock is used to compare the time settings, and a voltmeter (multimeter) is used to compare the measured values. But because of the poor safety performance of the small transformer of the 220V working power supply, there is no case shell.

There are many comparison devices for voltage monitors on the market, but the price is relatively high.

There are a large number of voltage monitors installed in the company's power grid, and the working power and measurement input terminals of the voltage monitors are connected in parallel, and the voltage monitors have three different voltage levels (100V, 220V, 380V), and only the power supply with rated voltage, the voltage monitor to work properly.

Enshi City is located in the Wuling Mountains, and some voltage monitors are installed far away from the company's maintenance department. When the on-site inspectors find that the voltage monitors are abnormal and cannot handle them by themselves, the inspectors can remove the voltage monitors and bring them to The company's maintenance department inspected that the general office space only has 220V AC power supply, and the voltage monitors of 100V and 380V will not be able to detect. Since the voltage monitor power supply and measurement input end are combined into a two-hole terminal, if a 100V voltage monitor is connected to a 220V AC power supply, the voltage will be too high, and the voltage monitor may be burned. If a 380V voltage monitor is connected to a 220V AC power supply, the voltage will be too low and the voltage monitor will not work at all.

Therefore, it is very necessary to have a detection power supply and a comparison device that can provide different voltage levels such as 100V, 220V, and 380V.

Utility model content

The technical problem to be solved by the utility model is to provide a detection device for a voltage monitor, which can provide detection of different voltage levels such as 100V, 220V, 380V, etc., and ensure the normal operation of the voltage monitor.

The technical scheme that the utility model solves the problems of the technologies described above is as follows:

A voltage monitor comparison device, comprising a voltage monitor and a junction box, wherein, the junction box is provided with 220V, 100V, 380V voltage input ports, and between the junction box and the voltage monitor is also provided with For a transformer, the 220V, 100V, 380V voltage input ports are connected to one end of the transformer with a common resistance line.

Further, the preferred structure is that the 100V and 380V voltage input interfaces share one voltage input interface, and a transfer switch is provided between the 100V and 380V voltage input interfaces and the neutral line, and the transfer switch Afterwards, they are respectively connected to the common resistance wires at one end of the transformer.

Further, the preferred structure is that the transfer switch selects a two-way toggle switch, and the AC 100V and 380V voltage input ports are respectively connected to any contact of the same road of the two-way toggle switch that is disconnected and closed from the middle contact. , the common resistance line at one end of the transformer is connected to the other contact of the transfer switch which is disconnected and closed with the intermediate contact.

Further, the preferred structure is that two resistance wires are provided on the other side of the voltage monitor, wherein the first resistance wire is connected to the operating voltage of the voltage monitor, which are respectively -15V and 15V; the second resistance wire is connected to display Screen working power supply, respectively 0V and 9V voltage.

Further, in a preferred structure, the junction box is also provided with a measurement signal input port connected to a measuring ammeter, and it is also connected to the measurement input terminal of the voltage monitor through wires.

After adopting the above scheme, the utility model can provide power supplies of different voltage levels during the operation and maintenance process of the voltage monitor, and provide reliable and safe power supply for the maintenance, operation and maintenance of the voltage monitor.

Other features and advantages of the present invention will be set forth in the following description, and, in part, will be apparent from the description, or can be learned by practicing the present invention. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The utility model will be described in detail below in conjunction with the accompanying drawings, so as to make the above-mentioned advantages of the utility model clearer.

Fig. 1 is the schematic diagram of the principle of the comparison device of the voltage monitor of the present invention;

Fig. 2 is a schematic diagram of the use state of the comparison device of the voltage monitor of the present invention.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments.

The technical solution of the present invention adopts the same model voltage monitoring instrument installed in the power grid, a small transformer with three voltage input ports of 220V, 100V and 380V, a changeover switch, and an annealed copper wire of 1mm2. The device is used for voltage monitor testing and detection to provide power supply and comparison of measured values.

As shown in Figure 1, the voltage monitor comparison device includes a voltage monitor and a junction box, wherein the junction box is provided with 220V, 100V, 380V voltage input ports, and the junction box and the voltage monitor There is also a transformer B1 between the instruments, and the 220V, 100V, and 380V voltage input ports are connected to one end of the common resistance line of the transformer B1 (in the embodiment, B1 has three kinds of voltage input ports of 220V, 100V, and 380V transformer).

Wherein, in the embodiment, the voltage input ports of 100V and 380V share two taps 102 and 103 of one voltage input port, and the two taps 102 and 103 are used as 100V and 380V voltage output wiring holes and zero points respectively. Line (N) output wiring hole.

Wherein, the taps 104 and 105 for the 220V voltage input interface are respectively used as the 220V wiring hole of the power input terminal and the neutral line (N) wiring hole of the power input terminal.

In addition, a transfer switch ZK is provided between the 100V and 380V voltage input ports and the resistance wire at one end of the transformer. Specifically, the 100V and 380V voltage input ports share two taps, and a switch is provided between the 100V and 380V voltage input ports and the neutral line, which are respectively connected to the One end of the transformer common resistance wire.

Among them, in a more preferred embodiment, the other side of the voltage monitor is provided with two resistance wires, wherein the first resistance wire is connected to the working voltage of the voltage monitor, which are respectively -15V and 15V; the second resistance wire is connected to The working power supply of the display screen is respectively 0V and 9V voltages, and the contact 101 (which is used as the wiring hole of the measuring instrument lead) connected to the measuring ammeter is provided in the junction box, and it is also connected to the voltage monitor by a wire The measurement input terminal 201 (which serves as a measurement signal line socket).

Wherein, in an embodiment, the instructions for use of the voltage monitor monitoring device are as follows:

(1) Connected to 220V AC power supply, the device will output power supply with three voltage levels of 100V, 220V and 380V.

(2) Connect the voltage monitor to be detected to the terminal of the output terminal of the device, and turn the changeover switch to a position consistent with the rated voltage of the voltage monitor to be detected. And the device can be energized to detect the voltage monitor to be tested.

(3) Check that all connections are correct.

(4) Check that the transfer switch is in the correct position

(5) energize the device and detect the voltage monitor to be detected.

(6) When testing the 220V voltage monitor, connect the detection power supply of the voltage monitor and the measurement input terminal of the comparison device with the working power terminal in parallel, and insert the comparison device and the voltage monitor to be tested into the 220V power socket at the same time, and can Perform detection and measurement data comparison checks.

(7) When testing the 100V voltage monitor, connect the voltage monitor detection power supply and the comparison device measurement input end with wires to the output end, and connect the working power measurement input end of the voltage monitor to be tested to the comparison device and output end , Turn the switch on the comparison device to the direction of 100V, and insert the working power plug of the comparison device into the 220V power socket. And can carry out detection and measurement data comparison check.

(8) When testing the 380V voltage monitor, connect the voltage monitor detection power supply and the comparison device measurement input end with wires to the output end, and connect the working power measurement input end of the voltage monitor to be tested to the comparison device and output end , Turn the switch on the comparison device to the direction of 380V, and insert the working power plug of the comparison device into the 220V power socket. It can also perform detection and measurement data comparison checks, and the schematic diagram of its wiring is shown in Figure 2.

(9) When detecting and comparing the 10kV bus voltage monitor of the substation, connect the detection power supply of the voltage monitor and the measurement input terminal of the comparison device with the output terminal with wires, and connect the output terminal of the comparison device with the working power supply of the voltage monitor to be tested Terminal connection, turn the switch of the device to 100V, insert the 220V power plug of the device, set the transformation ratio of the comparison device to 10000/100=100, and set the upper and lower limits according to the standard. At this time, the comparison can be detected and the voltage to be detected can be monitored. instrument. Manual comparison measurement data records.

After the utility model adopts the above scheme, it can provide power supplies of different voltage levels during the operation and maintenance of the voltage monitor, and simultaneously perform voltage measurement and clock value comparison, providing reliable, Safe power.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (5)

1. voltage monitoring instrument comparison device, it is characterized in that, comprise voltage monitoring instrument and terminal box, wherein, be provided with 220V, 100V, 380V voltage input end interface in this terminal box, and, also being provided with transformer between described terminal box and the voltage monitoring instrument, described 220V, 100V, 380V voltage input end interface are connected with an end common resistance line of transformer.

2. voltage monitoring instrument comparison device according to claim 1, it is characterized in that, the voltage input end interface of described 100V, 380V shares a voltage input end interface, and between the voltage input end interface of described 100V, 380V, be provided with switch, behind switch, be connected to an end common resistance line of described transformer again respectively.

3. voltage monitoring instrument comparison device according to claim 2, it is characterized in that, described switch is selected the two-way toggle switch, described interchange 100V, 380V voltage input end interface insert the same road of two-way toggle switch respectively and intermediate contact disconnects and arbitrary contact of closure, and the end common resistance line access same road of switch of described transformer and intermediate contact disconnect and other closed contact.

4. voltage monitoring instrument comparison device according to claim 1 and 2 is characterized in that, described voltage monitoring instrument opposite side is provided with two resistive conductors, and wherein, first resistive conductor connects the voltage monitoring instrument operating voltage, is respectively-15V and 15V voltage; Second resistive conductor connects the display screen working power, is respectively 0V and 9V voltage.

5. voltage monitoring instrument comparison device according to claim 1 is characterized in that, also be provided with in the described terminal box to connect the measuring-signal input port of measuring ammeter, and it also is connected to the measurement input end of described voltage monitoring instrument by lead.

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