CN206400047U - A kind of Current Transmit polarity test device - Google Patents

Abstract

The utility model discloses a CT polarity test device for a current transformer. The CT polarity test device comprises: a positive telescopic test rod, a negative telescopic test rod and a polarity tester; a hook-shaped test head of the positive telescopic test rod is used for Hooked on the CT primary side inlet terminal, the hook-shaped test head of the negative telescopic test rod is used to hook on the CT primary side outlet terminal; the polarity tester includes: CT primary side test module, meter test module, test switch and Power supply module, the test switch is used to control the conduction of the power supply module when it is turned on, and the conduction power supply module applies current to the primary side of the CT through the CT primary side test module and supplies power to the meter test module to deflect the pointer ammeter pointer of the meter test module , judge the CT polarity according to the deflection direction of the pointer. The CT polarity testing device of the utility model has the advantages of simplicity, safety, accuracy and high efficiency, reduces on-site manpower cost and testing time, and makes the whole testing process more smooth and simple.

Description

A current transformer CT polarity testing device

technical field

The embodiment of the utility model relates to a CT polarity testing technology, in particular to a CT polarity testing device.

Background technique

In the lines of power generation, transformation, power transmission, power distribution and power consumption, the current varies greatly, ranging from a few amps to tens of thousands of amps. In order to facilitate measurement, protection and control, the different currents of the lines are usually converted into a relatively uniform current , The current transformer (CT) installed in the line can play the role of current transformation and electrical isolation.

The current transformer CT includes the CT primary side inlet terminal (P1), the CT primary side outlet terminal (P2), the CT secondary side first terminal (S1) and the CT secondary side second terminal (S2). They should be electrically connected to the corresponding lines respectively. However, the polarity of the lines of S1 and S2 may be reversed during wiring, so a CT polarity test is required. It is a very important link to ensure the safe and normal operation of the power to conduct a polarity test on the CT of the 110kV and above high-voltage lines before power transmission.

At present, the "DC induction method" is widely used to test the polarity of CT because of its simplicity, safety and accuracy. However, there are many problems in the practical application of this method: firstly, the equipment used in the test is temporarily raised by the testers: the preparation of materials such as batteries, experimental lines, pointer-type universal transformers, and lap rods is time-consuming and laborious; secondly, the construction of equipment is random , instability and inconvenient operation. For example, the test line is usually fixed to the battery with insulating tape, and the pulling during the test is easy to damage the stability of the connection. At the same time, the connection between the test line and both sides of the CT is not easy to operate; and the personnel during the test It is often used and there is a problem of coordination: general testers need to be divided into two groups, one group applies current to the primary side of the CT, and the other group applies current to the primary side of the CT while observing the deflection direction of the pointer multimeter on the secondary side of the CT. Obviously, the existing CT polarity testing process has the problems of time-consuming and laborious.

Utility model content

The embodiment of the utility model provides a CT polarity testing device to save testing time and reduce labor costs.

The embodiment of the utility model provides a CT polarity test device, the CT polarity test device includes: a positive telescopic test rod, a negative telescopic test rod and a polarity tester;

The hook-shaped test head of the positive telescopic test rod is used to be hooked on the CT primary side inlet end, and the hook-shaped test head of the negative telescopic test rod is used to be hooked on the CT primary side outlet end;

The polarity tester includes: a CT primary side test module, a meter test module, a test switch and a power module, and the power module is connected to the CT primary side test module, the meter test module and the test switch respectively Electrically connected, the positive interface of the CT primary side test module is used to electrically connect with the positive telescopic test rod through the primary side positive test line, and its negative interface is used to connect with the negative telescopic test rod through the primary side negative test line Electrically connected, the current interface of the meter test module is used to electrically connect to the first test pen through the positive test line on the secondary side, and the first test pen is used to electrically connect to the first end of the CT secondary side, and its The public interface is used to electrically connect to the second test pen through the secondary side negative test line, and the second test pen is used to electrically connect to the second end of the CT secondary side;

When the test switch is turned on, it is used to control the conduction of the power supply module, and the conduction of the power supply module applies current to the primary side of the CT through the CT primary side test module and supplies power to the meter test module to make the The pointer of the pointer ammeter of the meter test module is deflected, and the CT polarity is judged according to the direction of the pointer deflection.

Further, the structures of the positive telescopic test rod and the negative telescopic test rod are both telescopic sleeve structures.

Further, an insulating protective sheath is provided on the outer sleeve of the positive telescopic test rod and the outer sleeve of the negative telescopic test rod.

Further, the maximum extension size of the positive telescopic test rod is 4m to 10m and the minimum contraction size is less than or equal to 1m, and the maximum extension size of the negative telescopic test rod is 4m to 10m and the minimum contraction size is less than or equal to 1m .

Further, the hook-shaped test head of the positive telescopic test rod is provided with a clip, and the clip is used to fix and hang the positive telescopic test rod on the CT primary side inlet end; the negative telescopic A clip is provided on the hook-shaped test head of the test rod, and the clip is used to fix and hang the negative telescopic test rod on the outlet end of the primary side of the CT.

Further, the hook-shaped test head of the positive telescopic test rod is provided with an electric test contact, and/or, the hook-shaped test head of the negative telescopic test rod is provided with an electric test contact.

Further, the power module includes at least two rechargeable lithium-ion batteries, one of which is used as a backup battery.

Further, the test switch is set on the CT primary side test module, the meter test module or the power supply module.

Further, at least one of the CT primary side test module, the meter test module and the power supply module is detachably installed in the polarity tester.

The CT polarity test device provided by the embodiment of the utility model is a simple high-voltage line CT polarity tester, which can provide the working needs of the whole test process, and the CT polarity test device can avoid the need for multiple testers in the test process Questions that work together to make the entire testing process easy and efficient. The CT polarity test device is based on the "DC induction method" to test the polarity of CT, which has the advantages of simplicity, safety, accuracy and high efficiency, effectively solves the problems existing in the test material preparation and construction process during the test process, and reduces the use of on-site personnel , improve the efficiency of on-site CT polarity testing, effectively save on-site preparation time, and make the whole testing process smoother and easier. Compared with the prior art, the CT polarity testing device has portability, and reduces on-site labor costs and testing time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description The drawings show some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is the schematic diagram of the CT polarity testing device that the utility model embodiment provides;

2A to 2B are schematic diagrams of the telescopic test rod provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of the hook-shaped test head of the telescopic test rod provided by the embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described through implementation modes with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments It is a part of embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The embodiment of the utility model provides a CT polarity testing device. The CT polarity testing device provided in this embodiment is used to test the CT polarity of a high-voltage line of 110 kV or above before power transmission. As shown in FIG. 1 , the CT polarity test device provided in this embodiment includes: a positive telescopic test rod 110 , a negative telescopic test rod 120 and a polarity tester 200 .

The hook-shaped test head 111 of the positive telescopic test rod 110 is used to be hooked on the CT primary side inlet end, and the hook-shaped test head 121 of the negative telescopic test rod 120 is used to be hooked on the CT primary side outlet end; the polarity tester 200 Including: CT primary side test module 210, meter test module 220, test switch 230 and power supply module 240, the power supply module 240 is electrically connected with CT primary side test module 210, meter test module 220 and test switch 230 respectively, CT primary side The positive interface (+) of the test module 210 is used to electrically connect with the positive telescopic test rod 110 through the primary side positive test line 211, and its negative terminal interface (-) is used to electrically connect the negative telescopic test rod 120 through the primary side negative test line 212. Connection, the current interface (mA) of the meter test module 220 is used to electrically connect to the first test lead 221 through the secondary side positive test line 223, and the first test lead 221 is used to electrically connect to the first end of the CT secondary side, And its public interface (com) is used to be electrically connected with the second test lead 222 by the secondary side negative test line 224, and the second test lead 222 is used for being electrically connected with the CT secondary side second terminal; When the test switch 230 is opened It is used to control the conduction of the power supply module 240. The conduction power supply module 240 applies current to the CT primary side through the CT primary side test module 210 and supplies power to the meter test module 220 so that the pointer ammeter 225 of the meter test module 220 deflects, according to The deflection direction of the pointer judges the CT polarity.

As mentioned above, the CT primary side test module 210 is electrically connected to the power supply module 240, the positive pole of the CT primary side test module 210 is electrically connected to the positive pole of the power supply module 240, and the negative pole of the CT primary side test module 210 is electrically connected to the negative pole of the power supply module 240. Specifically, the positive pole of the CT primary side test module 210 is electrically connected to the positive pole of the power module 240 through a primary side test line, and the negative pole of the CT primary side test module 210 is electrically connected to the negative pole of the power supply module 240 through another primary side test line; The positive and negative interfaces of the CT primary side test module 210 are electrically connected to the positive telescopic test rod 110 and the negative telescopic test rod 120 respectively. It should be noted that the positive test line 211 on the primary side and the negative test line 212 on the primary side have the same structure, and they are both test lines on the primary side. They are only distinguished in name, and the difference can also be reflected in the appearance to facilitate the connection of test lines. If the primary positive test line 211 and the primary negative test line 212 have different appearance colors, preferably the primary positive test line 211 has a red appearance color, and the primary negative test line 212 has a yellow appearance color.

The turned-on power supply module 240 can supply power to the CT primary side test module 210, that is, the turned-on power supply module 240 supplies power to the CT primary side test module 210 and the current is transmitted to the positive electrode through the primary side positive test line 211 and the primary side negative test line 212. A telescopic test rod 110 and a negative telescopic test rod 120 . The voltage amplitude transmitted by the optional power module 240 to the CT primary side test module 210 is 9V. Those skilled in the art can understand that the voltage amplitude output by the power module varies with the high voltage level of the high voltage line.

The meter test module 220 is provided with a pointer ammeter 225, a mA interface and a com interface, and the meter test module 220 is electrically connected to the power supply module 240; the mA interface and the com interface of the meter test module 220 are also electrically connected to the first test pen 221 respectively And the second test pen 222; when the test circuit is connected, the first test pen 221 is electrically connected to the first end (S1) of the CT secondary side, and the second test pen 222 is electrically connected to the second end (S2) of the CT secondary side. It should be noted that the positive test line 223 on the secondary side and the negative test line 224 on the secondary side have the same structure, and they are both test lines on the secondary side. They are only distinguished in name, and the difference can also be reflected in the appearance to facilitate testing. Line connection, such as the secondary side positive test line 223 and the secondary side negative test line 224 have different appearance colors, preferably the appearance color of the secondary side positive test line 223 is red, and the appearance color of the secondary side negative test line 224 is black . In order to facilitate the test line connection, it is also optional that the appearance color of the first test pen 221 is red, and the appearance color of the second test pen 222 is black.

The turned-on power supply module 240 can supply power to the meter test module 220 so that the meter test module 220 can perform a CT polarity test on the CT secondary side S1 terminal and the CT secondary side S2 terminal. In practical application, the optional meter testing module 220 is a pointer multimeter, the corresponding first test pen 221 is a red test lead of the pointer multimeter, and the second test pen 222 is a black test lead of the pointer multimeter.

The test switch 230 is electrically connected to the power supply module 240, and is used to control the conduction or disconnection of the circuit of the power supply module 240. The specific test switch 230 is used to control the positive and negative conduction of the power supply module 240 when it is turned on and to control the power supply when it is turned off. The positive and negative poles of the module 240 are disconnected. In this embodiment, the optional test switch 230 is a rotary switch, which at least includes a reset option and a test option. The test switch 230 points to the reset option in the initial state, that is, the test switch 230 is in an off state, and when the test switch 230 rotates to point to the test option, then Turning on the test switch 230 enables the CT polarity testing device to perform a CT polarity test. In this embodiment, the optional test switch 230 is set on the CT primary side test module 210 . In other optional embodiments, the optional test switch is a push-type switch. The test switch is in the closed state when pressed, and the test switch is in the open state when it is bounced. In the utility model, the structure and switch form of the test switch are not limited. A switch capable of realizing the function of a test switch falls within the protection scope of the present invention.

As shown in Figure 2A, it is a schematic diagram of the telescopic test rod provided by the embodiment of the present invention. In this embodiment, the positive telescopic test rod 110 and the negative telescopic test rod 120 have the same structure, and can only be distinguished as the positive telescopic test rod 110 in name. and the negative telescopic test rod 120 , the telescopic test rod 100 shown in FIG. 2A is a structure of the positive telescopic test rod 110 and the negative telescopic test rod 120 , specifically the telescopic test rod 100 in an extended state. The telescopic test rod 100 is made of conductive material. As shown in FIG. 2A, the hook-shaped test head 101 of the telescopic test rod 100 can be hooked on the primary side of the CT to realize electrical connection. The hook-shaped test head 101 of 100 is hooked on the CT primary side inlet terminal (P1) so that the positive telescopic test rod 110 is electrically connected to the CT primary side P1 end, and the hook-shaped test head 101 of the other telescopic test rod 100 is hooked The negative telescopic test rod 120 is electrically connected to the CT primary side P2 terminal at the CT primary side outlet terminal (P2).

The telescoping test rod 100 is an extendable and retractable test rod. As shown in Figure 2A, the telescopic test rod 100 is in a fully extended state. The position of the high-voltage line is usually higher, and the position of the primary side of the CT is correspondingly higher. Length, and then the telescopic test rod 100 is mounted on the primary side of the CT conveniently and quickly. As shown in Figure 2B, the telescopic test rod 100 is in a fully retracted state, and the tester can reduce the length of the telescopic test rod 100 by shrinking the telescopic test rod 100, so that the telescopic test rod 100 can be placed in the CT polarity test device and used at any time. Make the CT polarity testing device a set of testing devices that can be picked up and used at the job site. When it needs to be explained, in order to facilitate the contraction and extension of the telescopic test rod 100 , the hook-shaped test head 101 of the telescopic test rod 100 can be partially retracted or not retracted into the rod body in the fully retracted state.

The telescopic test rod 100 is also electrically connected to the polarity tester 200. Specifically, the line interface 102 provided on the telescopic test rod 100 is electrically connected to the primary side test line, and the primary side test line is connected to the CT primary side of the polarity tester 200. Module 210 is electrically connected. In this embodiment, the line interface 102 is arranged on the pole wall of the telescopic test rod 110. In other optional embodiments, the line interface can also be arranged on the bottom of the telescopic test rod to realize the electrical connection between the telescopic test rod and the primary side test line. connect. Those skilled in the art can understand that the designer can set the position of the line interface on the telescopic test rod according to the actual situation, and there is no specific limitation in the present invention; for example, in other optional embodiments, the primary side test line can pass through the telescopic test The rod body of the rod is directly fixed and electrically connected to the hook-shaped test head through bolts, and the optional telescopic test rod is made of insulating material.

It should be noted that, in this embodiment, the structure of the positive telescopic test rod 110 and the negative telescopic test rod 120 are the same, so the testers use two telescopic test rods 100 as shown in Figure 2A as the positive telescopic test rod 110 and the negative telescopic test rod Rod 120, and are respectively hooked to the P1 end and P2 end of the primary side of the CT. In practical applications, in order to facilitate subsequent lapping of the polarity tester 200, two telescopic test rods 100 with different appearance colors can be used as the positive telescopic test rod 110 and the negative polarity telescopic test rod 120, so as to facilitate the connection with the polarity tester 200. Negative electrical connection. For example, the appearance color of the optional positive telescopic test rod 110 is red, and the appearance color of the negative telescopic test rod 120 is black. Correspondingly, the appearance color of the primary side positive test line electrically connected with the positive telescopic test rod 110 is red. The appearance color of the primary side negative test line electrically connected with the negative telescopic test rod 120 is yellow.

To sum up, the testing process of CT polarity testing device is:

After the tester quickly assembles the CT polarity test device and connects the CT primary side and CT secondary side, he directly turns on the test switch 230 to make the power module 240 conductive, and the conductive power module 240 is used for the CT primary side test module. 210 and meter test module 220 supply power;

The CT primary side test module 210 applies current to the CT primary side through the positive telescopic test rod 110 and the negative telescopic test rod 120, and at the same time, the pointer of the pointer ammeter 225 of the meter test module 220 deflects;

A tester observes the deflection direction of the pointer of the pointer ammeter 225. If the pointer of the pointer ammeter 225 is positively deflected, the polarities of the S1 and S2 terminals of the CT secondary side are correct. If the pointer of the pointer ammeter 225 is reversely deflected, the CT secondary side S1 The polarities of terminals S1 and S2 are reversed. Tester A changes the wiring of terminals S1 and S2 on the secondary side of the CT, and the CT polarity test is completed.

Exemplarily, as shown in Figure 2A, the structures of the optional positive telescopic test rod 110 and the negative telescopic test rod 120 in this embodiment are both telescopic sleeve structures; when connecting the CT primary side, the tester stretches the positive telescopic test rod 110 And the negative pole telescopic test rod 120 makes it reach required length, is convenient to hook up on the CT primary side of the higher high-voltage line. In other optional embodiments, the structure of the positive telescopic test rod and the negative telescopic test rod is a folding rod structure. Those skilled in the art can understand that there are many structures of the positive telescopic test rod and the negative telescopic test rod, including but It is not limited to the telescopic sleeve type and the folding rod type, and is not specifically limited in the present invention.

It should be noted that the diameters of the sleeves of the telescopic sleeve type telescopic test rod 100 are successively reduced. For example, as shown in FIG. , 28mm, 25mm, 22mm, 19mm and 17mm, while the hook-shaped test head 101 has a connector diameter of 10mm and a diameter of its connector part of 7mm, thereby realizing the current transmission of the telescopic test rod 100 . Those skilled in the art can understand that the number of sleeves and the diameter of the sleeves of the telescopic sleeve type telescopic test rod can be set by themselves according to actual needs, and the number of folding rods and the diameter of the folding rods of the folding rod type telescopic test rod can be set according to actual needs. Setting, no specific limitation is carried out in the utility model.

Exemplarily, in this embodiment, the optional outer sleeve of the positive telescopic test rod 110 and the outer sleeve of the negative telescopic test rod 120 are provided with insulating protective sheaths. As shown in FIG. 2A , an insulating protective sheath 130 is disposed on the outer sleeve of the telescopic test rod 100 . It should be noted that the outer sleeve is the outermost sleeve of the telescopic test rod 100 , and it is also the hand-held area of the tester. There is danger in the CT polarity test of the high-voltage line. In order to avoid electric shock during the connection process and the test process, the outer casing of the positive telescopic test rod 110 and the outer casing of the negative telescopic test rod 120 are provided with insulating protective sleeves 130 to avoid Testers were electrocuted. Those skilled in the art can understand that on the basis of ensuring safety, the designer can install an insulating protective sleeve on the rod wall of the telescopic test rod, for example, an insulating protective sleeve is provided on a local area of at least one sleeve of the telescopic test rod.

Exemplarily, in this embodiment, the maximum extension size of the optional positive telescopic test rod 110 is 4m-10m and the minimum shrinkage size is less than or equal to 1m, and the maximum extension size of the negative telescopic test rod 120 is 4m-10m and the minimum contraction size Size less than or equal to 1m. The position of the high-voltage line is relatively high, and the safety height of the high-voltage line with different levels of voltage amplitude is usually different. Therefore, the maximum extension size of the telescopic test rod 100 is greater than or equal to 4m and less than or equal to 10m, which can meet the existing high-voltage lines of different levels. The voltage amplitude of the highest existing high-voltage line is 750KV, which is usually set at a position 8m above the ground. Therefore, the maximum extension size of the positive telescopic test rod 110 and the negative telescopic test rod 120 is preferably 8m. In order to facilitate the placement of the telescopic test rod 100 in the CT polarity test device and realize the portability of the CT polarity test device, the minimum shrinkage size of the optional telescopic test rod 100 is less than or equal to 1m, so as to avoid the large size from causing the CT polarity test The device is too large to be portable. Those skilled in the art can understand that the designer can design the maximum extension size and the minimum shrinkage size of the telescopic test rod according to the test needs, such as the maximum extension size is less than 4m or greater than 10m.

Exemplarily, the hook-shaped test head 111 of the optional positive telescopic test rod 110 is provided with a clip, which is used to fix and hang the positive telescopic test rod 110 on the CT primary side inlet end; the negative telescopic test rod 120 The hook-shaped test head 121 is provided with a clip, and the clip is used to fix and hang the negative telescopic test rod 120 on the outlet end of the primary side of the CT. As shown in Figure 3, the hook-shaped test head 101 of the telescopic test rod 100 is provided with a clip 103, and the clip 103 is an elastic material, so when the telescopic test rod 100 is hooked on the primary side of the CT, the clip 103 can clamp the CT The primary side prevents the telescopic test rod 100 from falling off from the primary side of the CT, improving the stability of the connection of the test line.

Exemplarily, the hook-shaped test head 111 of the positive telescopic test rod 110 may optionally be provided with electrical testing contacts, and/or, the hook-shaped test head 111 of the negative telescopic test rod 120 may be provided with electrical testing contacts. As shown in Figure 3, the hook-shaped test head 101 of the telescopic test rod 100 is provided with an electric test contact 104. The CT polarity test must be carried out when the high-voltage line is powered off, so the electric test contact 104 is used before the test line is connected. Conduct electrical testing on the primary side of the CT. When it is determined that the high-voltage line has no electricity, the subsequent test operation can be performed to ensure the safety of the test line connection and CT polarity test. Those skilled in the art can understand that the principle and operation steps of the electroscope contact are the same as those of conventional electroscopes.

Exemplarily, the optional power module 240 in this embodiment includes at least two rechargeable lithium-ion batteries, one of which is used as a backup battery. When the main battery is out of power, the backup battery can be replaced as the main battery. Keeping the power of the backup battery can avoid the problem that the test cannot be continued when the power is exhausted during the test, and the power module 240 can also test the CT polarity while charging The device is powered. It should be noted that the power supply module 240 has positive and negative plug-in interfaces, which are convenient for electrical connection with other modules.

Exemplarily, in other optional embodiments, the test switch may be set on the CT primary side test module, the meter test module or the power supply module.

Exemplarily, in other optional embodiments, at least one of the CT primary side test module, the meter test module and the power supply module is detachably installed in the polarity tester; for example, the CT primary side test module and the meter test module The meter test modules are independent of each other but share the power module, and the meter test module and the power module are integrated together. In this embodiment, the CT primary side test module 210 , the meter test module 220 and the power supply module 240 are integrated together to form a polarity tester 200 .

The CT polarity test device provided by the embodiment of the utility model is a simple high-voltage line CT polarity tester, which can provide the working needs of the whole test process, and the CT polarity test device can avoid the need for multiple testers in the test process Questions that work together to make the entire testing process easy and efficient. The CT polarity test device is based on the "DC induction method" to test the polarity of CT, which has the advantages of simplicity, safety, accuracy and high efficiency, effectively solves the problems existing in the test material preparation and construction process during the test process, and reduces the use of on-site personnel , improve the efficiency of on-site CT polarity testing, effectively save on-site preparation time, and make the whole testing process smoother and easier. Compared with the prior art, the CT polarity testing device has portability, and reduces on-site labor costs and testing time.

Note that the above are only preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described here, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the utility model. Therefore, although the utility model has been described in detail through the above embodiments, the utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the utility model. The scope of the present invention is determined by the appended claims.

Claims (9)

1. a kind of Current Transmit polarity test device, it is characterised in that including：Positive pole is stretched, and reference test bar, negative pole are flexible to be surveyed Bar and polarity tester；

The stretch hook-shaped measuring head of reference test bar of the positive pole is used to be articulated in CT primary sides end of incoming cables, and the negative pole stretches reference test bar Hook-shaped measuring head be used for be articulated in CT primary side leading-out terminals；

The polarity tester includes：CT primary sides test module, meter test module, test switch and power module, it is described Power module is electrically connected with the CT primary sides test module, the meter test module and the test switch respectively, described The anode interface of CT primary side test modules is used to electrically connecting by the flexible reference test bar of primary side positive pole p-wire and the positive pole, And its negative pole interface is used to electrically connect by primary side negative pole p-wire and the flexible reference test bar of the negative pole, the meter test The current interface of module be used for electrically connected by secondary side positive pole p-wire with the first test pen, first test pen for CT secondary sides first end is electrically connected and its common interface is used to be electrically connected with the second test pen by secondary side negative pole p-wire Connect, second test pen is used to electrically connect with the end of CT secondary sides second；

The test switch is used to control the power module to turn on when opening, and the power module of conducting passes through the CT Primary side test module applies electric current to CT primary sides powers to the meter test module simultaneously makes the meter test module Pointer ammeter pointer deflection, according to throw of pointer walking direction CT polarity.

2. CT polarity test devices according to claim 1, it is characterised in that the positive pole stretches reference test bar and described negative The structure of extremely flexible reference test bar is telescopic type structure.

3. CT polarity test devices according to claim 1 or 2, it is characterised in that outside the flexible reference test bar of the positive pole Insulation protective jacket is provided with the outer tube of sleeve pipe and the flexible reference test bar of the negative pole.

4. CT polarity test devices according to claim 1, it is characterised in that the maximum of the flexible reference test bar of the positive pole is stretched Size is opened up for 4m~10m and minimum of contraction size is less than or equal to 1m, and, the maximum extension chi of the flexible reference test bar of the negative pole Very little is 4m~10m and minimum of contraction size is less than or equal to 1m.

5. CT polarity test devices according to claim 1, it is characterised in that the hook-shaped survey of the flexible reference test bar of the positive pole Intermediate plate is provided with examination head, the intermediate plate, which is used to fix the flexible reference test bar of the positive pole, is articulated in the CT primary sides inlet wire End；Intermediate plate is provided with the hook-shaped measuring head of the flexible reference test bar of the negative pole, the intermediate plate is used for the flexible test of the negative pole Bar is fixed and is articulated in the CT primary sides leading-out terminal.

6. CT polarity test devices according to claim 1, it is characterised in that the hook-shaped survey of the flexible reference test bar of the positive pole Electrical verification contact is provided with examination head, and/or, it is provided with electrical verification contact on the hook-shaped measuring head of the flexible reference test bar of the negative pole.

7. CT polarity test devices according to claim 1, it is characterised in that the power module fills including at least two pieces Electric-type lithium ion battery, one of lithium ion battery is used as reserve battery.

8. CT polarity test devices according to claim 1, it is characterised in that the test switch is arranged on the CT mono- On secondary side test module, the meter test module or the power module.

9. CT polarity test devices according to claim 8, it is characterised in that the CT primary sides test module, described At least one of meter test module and the power module module are removably mounted in the polarity tester.