CN206990725U - A kind of novel transformer substation secondary cable alignment device - Google Patents

Abstract

The utility model discloses a novel substation secondary cable alignment device, which comprises a measured terminal and a measuring terminal respectively arranged at two ends of the secondary cable to be tested and a voltage measuring device for measuring the voltage at both ends of the secondary cable. The terminal under test is provided with a power supply, a switch K1, N terminals and N+1 wiring resistors connected in series on both sides of the power supply and the switch, and the N terminals are respectively connected to any two adjacent wiring resistors. Wiring nodes are connected. The utility model sets the wiring terminals, and sets the wiring resistance between the wiring terminals, and then connects all the wiring resistances in series at a certain voltage, so that the voltage value between any two points of each wiring terminal can be determined. , so that the voltage difference table can be formulated, and then the voltage measurement of the other end of the secondary cable to be tested is carried out, and the corresponding label is determined by the table look-up method, so that the alignment of the cable can be completed. The two are convenient and fast as a whole, and the cost Low, high precision.

Description

A New Type of Substation Secondary Cable Alignment Device

technical field

The utility model relates to the technical field of power system maintenance equipment, in particular to a novel substation secondary cable alignment device.

Background technique

At present, in the construction and renovation of substations, a large number of secondary cables are used to connect different power equipment. For the sake of beauty, the cables are usually laid in cable trenches. Therefore, when laying secondary cables, marks will be made on both sides of the same cable to facilitate identification of the cable direction. After the cable is laid, in order to connect accurately, the staff will carry out alignment work at the working positions on both sides of the same cable, that is, to confirm the one-to-one correspondence of each core wire one by one, and make identification marks. The common practice is that one person short-circuits two core wires on one side of the cable, and the other person uses a multimeter on the opposite side to measure the two short-circuited core wires, and uses a walkie-talkie to communicate. In order to save manpower, the wiring device is also used in actual work, but the wireless transmission technology is generally used, and the use of wireless communication equipment is prohibited in the relay protection room of the substation. However, some substation relay protection rooms use more electromagnetic relays, and wireless communication equipment may affect the stable operation of substations. Therefore, the State Grid Corporation of China prohibits the use of wireless communication equipment in substation relay protection rooms.

Utility model content

The purpose of this utility model is to provide a new type of substation secondary cable alignment device, which can mark each core wire on the side of the secondary cable at the same time without using wireless transmission technology, so that each core wire can be connected to a different potential. The path is formed by the secondary cable itself, and the voltage of any two core wires is measured on the other side of the secondary cable, and the mark of the selected core wire is determined by the look-up table method. This method can well meet the working environment of the substation relay protection room, and can quickly and accurately complete the secondary cable alignment work, saving manpower.

The technical scheme that the utility model adopts is:

A new type of substation secondary cable alignment device, including a measured terminal and a measuring terminal respectively arranged at both ends of the secondary cable to be tested and a voltage measuring device for measuring the voltage at both ends of the secondary cable. The end is provided with a power supply, a switch K1, N terminals and N+1 wiring resistors connected in series on both sides of the power supply and the switch, and the N terminals are respectively connected to the wiring nodes of any two adjacent wiring resistors, And the N terminals are correspondingly provided with labels; the measuring terminal is a measuring line plug-in strip with a label, and the number of plug-in jacks is not less than N; the voltage value between any two terminals not equal.

The voltage value of the power supply is equal to the sum of the resistance values of the N+1 wiring resistors.

The voltage measuring device is a multimeter.

It also includes an LED indicator light, and the LED indicator light L1 is connected in parallel with a series circuit composed of N+1 wiring resistors.

The utility model sets the wiring terminals, and sets the wiring resistance between the wiring terminals, and then connects all the wiring resistances in series at a certain voltage, so that the voltage value between any two points of each wiring terminal can be determined. , so that the voltage difference table can be formulated, and then the voltage measurement of the other end of the secondary cable to be tested is carried out, and the corresponding label is determined by the table look-up method, so that the alignment of the cable can be completed. The two are convenient and fast as a whole, and the cost Low, high precision.

Description of drawings

Fig. 1 is a functional block diagram of the circuit structure of the utility model.

detailed description

As shown in Figure 1, the utility model includes the measured terminal and the measuring terminal respectively arranged at the two ends of the secondary cable to be tested and a voltage measuring device for measuring the voltage at the two ends of the secondary cable. There are a power supply, a switch K1, N terminals, and N+1 wiring resistors connected in series on both sides of the power supply and the switch, and the N terminals are respectively connected to the wiring nodes of any two adjacent wiring resistors, and N Each terminal is provided with a label correspondingly; the measuring terminal is a measuring line plug-in strip with a label, and the number of plug-in jacks is not less than N. The voltage value of the power supply is equal to the sum of the resistance values of the N+1 wiring resistors. If they are set to be equal, the measured voltage values can be integers, which is convenient for checking. However, the voltage values between any two terminals are not equal, by considering the unequal voltage values between any two terminals when setting the resistance, the unique correspondence of the voltage values can be determined, and it can also be used for checking table method lays the foundation.

The voltage measuring device is a multimeter, and since the multimeter itself has two measuring terminals, red and black, it is convenient for measurement and comparison.

It also includes an LED indicator light, which is connected in parallel with a series circuit composed of N+1 wiring resistors.

The tested end of the utility model is composed of a DC voltage source Vdc, a power control switch K1, a power indicator light L1 and resistors R1~R11. A terminal block with 10 holes is reserved. The test terminal is a terminal block with 10 holes.

The terminal under test divides the DC voltage source through 11 resistors to obtain 10 potential values, which are respectively connected to the 1~10 holes of the terminal block of the terminal under test. Peel off the cable sheath at both ends of the secondary cable respectively, so that the core wire exposes a section of bare copper wire and connect it to the terminal under test and the test end.

Before starting work, mark each secondary cable core wire at the tested end, and determine the tested end mark of the tested core wire by measuring the potential difference between the two core wires at the measuring end. The voltage measuring device is a multimeter. The multimeter can detect voltage, and the stylus comes with classification marks (red pen, black pen) which are more convenient to use. It also includes an LED indicator light, which is connected in parallel with a series circuit composed of N+1 wiring resistors.

Take a 10-core secondary cable as an example for specific wiring, let Vdc=100V, R1=1kΩ, R2=1kΩ, R3=2kΩ, R4=4kΩ, R5=5kΩ, R6=8kΩ, R7=10kΩ, R8= 14kΩ, R9=21kΩ, R10=26kΩ, R11=8kΩ. After the secondary cable is connected to the wire alignment device, the core wires corresponding to holes 1 to 9 of the terminal row under test are marked as 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 respectively. After measuring that Vdc is 100V, close K1. After finding that L1 is lit, the staff goes to the measurement end of the secondary cable, uses a multimeter to measure any two core wires, and obtains a voltage value. Take 17V as an example, through the look-up table method Determine the marks of the two core wires to be tested. The black test pen of the multimeter measures the core wire as 6, and the red test pen of the multimeter measures the core wire as 3. The marks of all the core wires can be determined by measuring a total of 5 times. If the measured voltage is negative, just reverse the red and black test leads. Take -17V as an example. At this time, the red test lead of the multimeter measures 6, and the black test lead of the multimeter measures 3. The terminal under test consists of a DC voltage source Vdc, a power control switch K1, a power indicator light L1 and resistors R1~R11. A terminal block with 10 holes is reserved. The test terminal is a terminal block with 10 holes. The terminal under test divides the DC voltage source through 11 resistors to obtain 10 potential values, which are respectively connected to the 1~10 holes of the terminal block of the terminal under test. Peel off the cable sheath at both ends of the secondary cable respectively, so that the core wire exposes a section of bare copper wire and connect it to the terminal under test and the test end.

Claims (4)

1. A new substation secondary cable alignment device, characterized in that: it includes a measured terminal and a measuring terminal respectively arranged at the two ends of the secondary cable to be tested and a voltage measuring device for measuring the voltage at both ends of the secondary cable , the terminal under test is provided with a power supply, a switch K1, N terminals and N+1 wiring resistors connected in series on both sides of the power supply and the switch, and the N terminals are respectively connected to any two adjacent wiring resistors The connection nodes are connected, and the N terminals are correspondingly provided with labels; the measurement terminals are measuring line sockets with labels, and the number of sockets of the sockets is not less than N; the arbitrary two connection terminals The voltage values between the terminals are not equal. 2. The new substation secondary cable alignment device according to claim 1, characterized in that: the voltage value of the power supply is equal to the sum of the resistance values of N+1 wiring resistors. 3. The new substation secondary cable alignment device according to claim 2, characterized in that: said voltage measuring device is a multimeter. 4. The novel substation secondary cable alignment device according to claim 3, further comprising an LED indicator light, said LED indicator light L1 being connected in parallel with a series circuit composed of N+1 wiring resistors.