CN204086512U - A kind of portable simulation resistor for Insulation Inspection Device for Direct-Current System verification - Google Patents

Abstract

The utility model discloses a kind of portable simulation resistor for Insulation Inspection Device for Direct-Current System verification, comprise box body, be arranged on 8 wire columns on box body, be arranged on 7 resistance of mutually connecting in box body, for connecting the shorting stub of two wire columns, and for connecting the connecting line of wire column and Insulation Inspection Device for Direct-Current System, the bottom of each wire column is connected with the wire between adjacent two resistance respectively, and the top of each wire column is exposed at outside box body.When above-mentioned portable simulation resistor uses, be connected with Insulation Inspection Device for Direct-Current System by the wire column of connecting line by correspondence, two different wire columns are connected by shorting stub, finally by the permutation and combination of different resistance values, the resistance of various resistance can be simulated, in D.C. isolation monitoring device test process, the resistance value of needs can be transferred to quickly and easily, verify the reliable of insulation monitoring and warning device quickly and accurately, substantially increase D.C. isolation device verification speed and accuracy.

Description

A Portable Analog Resistor Used for Calibration of DC System Insulation Monitoring Device

technical field

The utility model relates to a portable analog resistor used for checking the insulation monitoring device of a DC system, which belongs to the technical field of electric power systems.

Background technique

As the main power supply system of the substation, the DC system is responsible for continuously providing reliable DC power to other equipment. The DC system mainly includes charging panels, feeding panels, and batteries. Among them, the insulation monitoring device in the feeding panel mainly judges the insulation status of the entire power system (including DC ground faults and low insulation caused by various reasons) by automatically measuring the insulation resistance value, and is used to quickly find the fault point , eliminate hidden dangers in time, and improve the safety factor of the DC system. Therefore, the reliability of the insulation monitoring device directly affects the safe operation of the power system. Effectively judging its reliability before the DC system is put into operation and during the operation inspection becomes the inspection and maintenance insulation monitoring The main indicator of the device.

Due to the different DC voltage levels of the power system, including 220V, 110V, 48V, etc., for DC systems of different voltage levels, the grounding resistance action value of the DC grounding fault signal of the insulation monitoring device is also different. The grounding resistance action value of the 220V system is 25 kΩ. The 110V system is 7 kohms, and the 48V system is 1.7 kohms (sometimes the grounding resistance value of the DC system with the same voltage level is different according to different power standards). At present, the DC system insulation monitoring device widely uses the balance bridge principle to monitor the DC grounding, as shown in the attached picture As shown in 1: the resistors R1', R2' and relay J in the figure are the basic units of the insulation monitoring device. Usually the resistance values of R1' and R2' are equal to 1KΩ, and the relay J is a DC small current relay. The resistors R+ and R - are the resistances to ground of the positive and negative poles of the DC system, respectively. Under normal circumstances, both R+ and R- are infinite, and the insulation monitoring device does not alarm. Only when DC grounding or low insulation occurs in the system, the low insulation signal is reported. Therefore, when the substation is put into operation and the DC system is checked and accepted , it is necessary to connect a resistance R' to the insulation monitoring device in series to verify the accuracy of the alarm value of the insulation monitoring device. Therefore, for the same voltage level, a variety of resistance values are required for testing. In this case, before each test, the It is necessary to carry all the resistors with different values, and all the resistors are placed scatteredly, which not only increases the labor load, but also increases the probability of parts being lost, causing a certain waste of manpower and material resources.

In view of this, the inventor conducted research on this, and specially developed a portable adjustable analog resistor for DC system insulation monitoring device verification, and this case arose from it.

Utility model content

The purpose of the utility model is to provide a portable adjustable analog resistor for DC system insulation monitoring device verification, which is easy to carry and adjustable in resistance, and can greatly improve the insulation resistance value testing efficiency of the insulation monitoring device.

In order to achieve the above object, the solution of the present utility model is:

A portable adjustable analog resistor for DC system insulation monitoring device calibration, including a box body, 8 wire posts arranged on the box body, and 7 resistors connected in series in the box body, used to connect two The short wiring of each lead post, and the connecting wire used to connect the lead post and the insulation monitoring device of the DC system. In vitro, the resistors include a first resistor with a resistance of 1.5KΩ, a second resistor with a resistance of 2KΩ, a third resistor with a resistance of 3KΩ, a fourth resistor with a resistance of 9KΩ, and a fifth resistor with a resistance of 10KΩ. resistance, the sixth resistance with a resistance value of 15KΩ and the seventh resistance with a resistance value of 20KΩ. The second wire column, the third wire column, the fourth wire column, the fifth wire column, the sixth wire column, the seventh wire column between the resistor and the seventh resistor, and are arranged at the beginning of the first resistor and the end of the seventh resistor The first lead post and the eighth lead post.

When the above-mentioned portable adjustable analog resistor used for the verification of the DC system insulation monitoring device is used, the corresponding lead post is connected to the DC system insulation monitoring device through a connecting line, and two different lead posts are connected through a short wire, and then the The resistance between the two wire columns is short-circuited, and finally through the arrangement and combination of different resistance values, various resistance values can be simulated, and the required resistance value can be easily and quickly adjusted during the test process of the DC insulation monitoring device, and connected Simulate the DC grounding in the DC feeder branch, accurately and quickly verify the reliability of the insulation monitoring device, and greatly improve the verification speed and accuracy of the DC insulation device.

The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the schematic diagram of the calibration of the DC system insulation monitoring device in the prior art;

Fig. 2 is the front view of the portable adjustable analog resistor of the present embodiment;

Fig. 3 is the electrical schematic diagram of the portable adjustable analog resistor of the present embodiment;

FIG. 4 is a schematic diagram of the calibration of the DC system insulation monitoring device of this embodiment.

Detailed ways

As shown in Figure 2, a portable adjustable analog resistor for DC system insulation monitoring device verification, including a box body 1, 8 wire posts arranged on the box body, and 7 wire posts arranged in the box body 1 Resistors connected in series, a short wire 2 for connecting two wire posts, and a connecting wire 3 for connecting the wire post and the DC system insulation monitoring device, the bottom end of each wire post is connected to the connection between two adjacent resistors The wires are connected, and the top of each wire column is exposed outside the box. The resistors include a first resistor R1 with a resistance of 1.5KΩ, a second resistor R2 with a resistance of 2KΩ, a third resistor R3 with a resistance of 3KΩ, and a resistance value of 1.5KΩ. The fourth resistor R4 of 9KΩ, the fifth resistor R5 of 10KΩ, the sixth resistor R6 of 15KΩ, and the seventh resistor R7 of 20KΩ, the wire column includes sequentially arranged on the first resistor R1 , the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 between the second lead post 4b, the third lead post 4c, the fourth lead post 4d , the fifth wire column 4e, the sixth wire column 4f, the seventh wire column 4g, and the first wire column 4a and the eighth wire column 4h arranged at the beginning of the first resistor R1 and the end of the seventh resistor R7.

As shown in Figure 3, when the short wire 2 is inserted between the third terminal 4c and the eighth terminal 4h, the resistance of the third resistor R3 to the seventh resistor R7 is short-circuited to 0, and the first terminal 4a and the eighth terminal Calculation of the lead-out resistance of the terminal 4h: R1+R2+0=1.5K+2K+0=3.5K, so the portable adjustable analog resistor for the DC system insulation monitoring device verification, the resistance value that can be provided includes (the following units are is KΩ):

1.5+2＝3.5 2+3＝5 3+9＝12 9+10＝19 10+15＝25

1.5+3＝4.5 2+9＝11 3+10＝13 9+15＝24 10+20=30

1.5+9＝10.5 2+10＝12 3+15＝18 9+20＝29 15+20=35

1.5+10＝11.5 2+15＝17 3+20＝23

1.5+15＝16.5 2+20+22

1.5+20=21.5

1.5+2+3=6.5

1.5+2+3+9=15.5

1.5+2+3+9+10=25.5

1.5+2+3+9+10+15=40.5

1.5+2+3+9+10+15+20=60.5

2+3+9=14

2+3+9+10=24

2+3+9+10+15=39

2+3+9+10+15+20=59

3+9+10=22

3+9+10+15=37

3+9+10+15+20=57

9+10+15=34

9+10+15+20=54

10+15+20=45

It can be seen from the above resistance values that by inserting several short wires into different binding posts, shorting the resistance between the insertion points, or directly extracting any two binding posts, the above 36 resistance values can be simulated, plus every two Between the binding posts, there are 1.5KΩ, 2KΩ, 3KΩ, 9KΩ, 10KΩ, 15KΩ, and 20KΩ resistance values alone. The portable adjustable analog resistor described in this embodiment can simulate a total of 43 resistance values. The DC system insulation monitoring devices of standard and different voltage levels can be portable and effectively use different numerical resistances to verify the alarm action value of the DC system insulation device.

The method of using the portable adjustable analog resistor described in this embodiment to verify the insulation monitoring device of the DC system is as follows, as shown in Figure 4, because the principle of verifying the grounding of the positive electrode E of the DC system is consistent with the principle of verifying the grounding of the negative electrode F of the DC system, and For the DC system insulation monitoring device J of different standards and different voltage levels, as described above, it can be realized only by changing the resistance combination of the utility model. Therefore, the alarm resistance value of the analog DC system insulation device is 25KΩ, and the positive pole of the DC system is grounded as an example. , the method of operation is as follows:

Since the alarm resistance value of the DC system insulation device J is 25KΩ, the resistance between the fifth terminal 4e and the seventh terminal 4g of the portable analog resistor is extracted. As mentioned above, the resistance between the fifth terminal 4e and the seventh terminal 4g The resistance is R5+R6=10K+15K=25K, connect the fifth terminal 4e to the E point of the absolute DC system, connect the seventh terminal 4g to the ground point of the absolute DC system, and simulate the positive pole of the DC system to be grounded. If the insulation monitoring device J sends out an alarm signal, it is determined that the insulation monitoring device alarm is normal. When the insulation monitoring device does not alarm, the resistance test can be combined again until the insulation monitoring device alarms. The resistance at this time is the actual alarm value of the insulation monitoring device. the

The above-mentioned embodiments and drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present utility model.

Claims (1)

1. the portable adjustable simulation resistor for Insulation Inspection Device for Direct-Current System verification, it is characterized in that: comprise box body, be arranged on 8 wire columns on box body, be arranged on 7 resistance of mutually connecting in box body, for connecting the shorting stub of two wire columns, and for connecting the connecting line of wire column and Insulation Inspection Device for Direct-Current System, the bottom of each wire column is connected with the wire between adjacent two resistance respectively, the top of each wire column is exposed at outside box body, and described resistance comprises the first resistance that resistance is 1.5K Ω, resistance is second resistance of 2K Ω, resistance is the 3rd resistance of 3K Ω, resistance is the 4th resistance of 9K Ω, resistance is the 5th resistance of 10K Ω, 7th resistance of resistance to be the 6th resistance of 15K Ω and resistance be 20K Ω, described wire column comprises and is successively set on the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, the second wire column between 6th resistance and the 7th resistance, privates post, privates post, 5th wire column, 6th wire column, 7th wire column, and be arranged on the first resistance top, first wire column of the 7th resistance end and the 8th wire column.