CN204203356U - High tension loop contact resistance live line measurement device - Google Patents

Abstract

The high-voltage circuit contact resistance live measurement device includes a closed insulating shell, a voltage measuring device set in the shell, and first and second shielding sleeves sleeved on the shell. The voltage measuring device is provided with a The first and second test lines outside the body, the first and second test lines outside the casing are correspondingly wrapped with third and fourth shielding sleeves, and the first and second shielding sleeves correspond to the third and fourth shielding sleeves Conductive connection, the first and second shielding sleeves are arranged at intervals to form a barrier gap, the first shielding sleeve is covered with a metal discharge collar that spans the barrier gap, and the front section of the metal discharge collar is connected to the second The outer peripheral surface of the shielding sleeve is arranged in parallel and at intervals to form a discharge gap. The discharge gap can discharge when a transient overvoltage occurs, and lead the fault arc to the outside of the casing to prevent the arc from damaging the voltage measuring device inside the casing.

Description

High-voltage circuit contact resistance live measuring device

technical field

The utility model relates to a live measuring device for contact resistance of a high-voltage circuit, in particular to a terminal voltage for measuring the contact resistance to calculate the resistance value of the contact resistance.

Background technique

People usually hope that the resistance of electrical contacts to the circuit at the contact point is zero, that is, the contact resistance is zero. However, a large number of experiments have shown that the resistance of electrical contact parts exists more or less, and the influence on the circuit cannot be ignored. Therefore, it is very important to study the contact resistance of electrical appliances to reduce the influence on the circuit.

Contact resistance is the resistance generated by two contact elements at the contact position. Whether the contact element is reliable or not, the normal diversion circuit is generally several to tens of micro-ohms, and hundreds or even thousands of micro-ohms appear, which essentially lies in Whether the resistivity, pressure, and effective cross-section of the contact part are stable or not, the contact resistance is the ratio of the potential difference on both sides of the contact surface to the current passing through the contact surface, which conforms to Ohm's law, that is, R _X = U/I, the current measurement of contact resistance The methods are all carried out offline (offline). The measuring device provides a DC power supply to both ends of the contact resistance, and U and I are measured by the ammeter and voltmeter, and then the contact resistance R _X is calculated. Due to the potential difference of the contact resistance measurement under the strong current in the power system, it is necessary to consider the interference under the strong electric field and the strong magnetic field and the safety of the measuring device to the system and the measuring device itself, so the prior art is not charged. Method and device for measuring contact resistance potential difference.

Contents of the invention

The purpose of the utility model is to provide a measuring device capable of measuring the potential difference of contact resistance with electricity for the deficiencies of the prior art.

The purpose of this utility model is achieved through the following technical solutions:

The high-voltage circuit contact resistance live measuring device is used to measure the voltage of the high-voltage circuit contact resistance to calculate the resistance value. It is characterized in that it includes a closed insulating shell, a voltage measuring device set in the shell, and a sleeve set on the shell. The first and second shielding sleeves, the voltage measuring device is provided with first and second test lines extending to the outside of the housing, and the first and second test lines outside the housing are correspondingly wrapped with third and fourth shielding sleeves , the first and second shielding sleeves are correspondingly electrically connected to the third and fourth shielding sleeves, the first and second shielding sleeves are arranged at intervals to form a barrier gap, and the first shielding sleeve is provided with a spanning A metal discharge collar blocking the gap, the front section of the metal discharge collar is arranged parallel to and spaced from the outer peripheral surface of the second shielding sleeve to form a discharge gap.

Further, the utility model also includes a first wireless communication module arranged in the housing and connected to the voltage measuring device, and a terminal device provided with a second wireless communication module, and the voltage measuring device passes through the first and second wireless communication modules Realize data transmission with terminal equipment.

Further, the housing is provided with an insulating operating rod, and the second shielding sleeve is provided with an escape hole for the insulating operating rod to pass through, and the first wireless communication module transmits data through the escape hole.

Further, the metal discharge sleeve is composed of a clamping ring segment tightly wrapped around the outer peripheral surface of the first shielding sleeve, a horizontally extending discharge ring segment, and a connecting ring segment connected between the clamping ring segment and the discharge ring segment.

Further, the front end of the discharge ring segment extends outward.

Further, the metal discharge collar is an open ring body, the opening of which is connected by adjusting bolts and nuts, the diameter of the metal discharge collar can be adjusted by adjusting the size of the opening, and the clamping ring section is locked by locking The bolt is locked with the first shielding sleeve.

Further, the discharge gap is equal to 1/5-3/5 of the barrier gap.

Further, the first and second wireless communication modules are Bluetooth communication modules or WiFi communication modules.

Further, at least one of the first and second shielding sleeves is movably sleeved on the casing to adjust the size of the discharge gap.

Further, the first and second shielding sleeves are both composed of a collar surrounding the outer peripheral surface of the shell and a sealing plate closing the end surface of the collar.

The utility model has the following beneficial effects:

The voltage measuring device is set in the casing, and the first and second shielding sleeves are sheathed outside the casing, the outer peripheral surfaces of the first and second test lines are wrapped with the third and fourth shielding sleeves, and the shielding sleeves can shield the electric field and The magnetic field prevents the voltage measuring device from being disturbed by the electric field and magnetic field, and ensures the measurement accuracy of the voltage measuring device; a discharge gap is formed between the metal discharge collar and the second shielding sleeve, and the discharge gap can be discharged when a transient overvoltage occurs. The fault arc is led to the outside of the shell to prevent the arc from damaging the voltage measuring device inside the shell; the front section of the metal discharge collar is arranged in parallel with the outer peripheral surface of the second shielding sleeve, which can make the electric field in the discharge gap uniform and ensure good discharge repeatability in the discharge gap , the metal discharge collar is an open ring body, the diameter of the metal discharge collar can be adjusted by adjusting the size of the opening, thereby adjusting the size of the discharge gap to adapt to different working conditions; an insulating operating rod is set on the shell, It is convenient for the operator to carry out high-level live measurement and ensure the safety of operation; the voltage measurement device realizes wireless communication with the terminal equipment through the wireless communication module, and can transmit the measurement data to the terminal equipment, so as to conveniently observe and record the measurement results.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a functional block diagram of the utility model.

Fig. 3 is a sectional view of the utility model.

Fig. 4 is an installation structure diagram of a metal discharge collar with an adjustable diameter.

detailed description

Referring to Fig. 1, Fig. 2 and Fig. 3, the high-voltage circuit contact resistance live measurement device includes an insulating shell 1, a voltage measuring device 3, a first shielding sleeve 21, a second shielding sleeve 22, a third shielding sleeve 51, a first Four shielding sleeves 52, the first bluetooth communication module 4 and the mobile phone 6, wherein the first shielding sleeve 21, the second shielding sleeve 22, the third shielding sleeve 51, and the fourth shielding sleeve 52 are metal materials such as copper and aluminum.

The casing 1 is cylindrical, and an insulating operating rod 11 is arranged below it. The insulating operating rod 11 can be a telescopically adjustable rod-shaped body. The casing 1 can be lifted to a high position through the insulating operating rod 11 to measure the The potential difference of the contact resistance R, the first and second shielding sleeves 21, 22 are set outside the housing 1, and the first shielding sleeve 21 is formed by the ring 211 surrounding the outer peripheral surface of the housing 1 and the sealing ring 211 end surface. plate 212, the second shielding sleeve 22 is composed of a collar 222 surrounding the outer peripheral surface of the housing 1 and a sealing plate 223 closing the end face of the collar 222, and the second shielding sleeve 22 is provided with a space for the insulating operating rod 11 to pass through. The hole 221, the voltage measuring device 3 is arranged inside the housing 1, and the first and second test lines 31 and 32 extending to the outside of the housing 1 are provided for measuring the potential difference between the two ends of the contact resistance R. The housing 1 and the sealing The plates 212, 223 are formed with relief holes for the first and second test lines 31, 32 to pass through, the fourth shielding sleeve 52 wraps the second test line 32 outside the housing 1, and the third shielding sleeve 51 wraps the outside of the housing The first test line 31, wherein, the first and second shielding sleeves 21, 22 are electrically connected to the third and fourth shielding sleeves 51, 52 through wires 331, 332, and the first and second shielding sleeves 21, 22 are spaced apart Set to form a barrier gap D, the first shielding sleeve 21 is covered with a metal discharge collar 7 across the barrier gap D, and the front section of the metal discharge collar 7 is arranged in parallel with the outer peripheral surface of the second shielding sleeve 22 to form a discharge gap L, the barrier gap D between the opposite annular edges of the first and second shielding sleeves 21 and 22 is equal everywhere, and the metal discharge collar 7 is extended horizontally by the clamping ring section 71 that is tightly hugged on the outer peripheral surface of the first shielding sleeve 21 The discharge ring segment 72 is composed of a connecting ring segment 77 connected between the tight ring segment 71 and the discharge ring segment 72 , and the front end of the discharge ring segment 72 extends outward along 73 .

Referring to Fig. 4, it is a metal discharge collar 7 with an adjustable diameter. The metal discharge collar 7 is an open ring body, and its opening is connected by an adjusting bolt 75 and a nut 76, and the opening is adjusted by loosening/tightening the adjusting bolt 75. The diameter of the metal discharge collar 7 can be adjusted in size, thereby adjusting the size of the discharge gap L, and the clamping ring section 71 is locked with the first shielding sleeve 21 through the locking bolt 74 .

The first bluetooth communication module 4 is arranged in the casing 1 and is connected with the voltage measuring device 3, and the transmitting antenna 41 of the first bluetooth communication module 4 is arranged near the hole 221, and the measurement data is sent to the outside through the hole 221, and the mobile phone 6 has a built-in second Bluetooth communication module 61, and the voltage measurement device 3 realizes data transmission with the mobile phone 6 through the first and second Bluetooth communication modules 4, 61, and the mobile phone 6 receives the data and displays the measurement results.

The specific measurement method is: the housing 1 is lifted to a high position through the insulating operating rod 11, and the two test lines 31, 32 of the voltage measuring device 3 are conductively connected with the two ends of the contact resistance R, and the voltage measuring device 3 passes the measurement result through the first 1. The second bluetooth communication module 4, 61 sends it to the mobile phone 6, and the mobile phone 6 receives and displays the measurement result. When a lightning strike causes a transient overvoltage, the discharge gap L is discharged to lead the fault arc to the outside of the housing 1. The arc is prevented from damaging the voltage measuring device 3 inside the housing 1 .

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited with this, that is, equivalent changes and modifications made according to the patent scope of the utility model and the content of the specification should still be carried out. It belongs to the scope covered by the utility model patent.

Claims (10)

1. high tension loop contact resistance live line measurement device, for the voltage of live line measurement high tension loop contact resistance to calculate resistance, it is characterized in that: comprise closed insulation shell, be arranged at the voltage measuring apparatus in housing, be set in first on housing, secondary shielding cover, described voltage measuring apparatus is provided with and extends to first of outside, second p-wire, outside housing first, second p-wire correspondence is enclosed with the 3rd, 4th bell housing, described first, secondary shielding cover is corresponding to the 3rd, 4th bell housing conduction connects, described first, secondary shielding cover interval arranges and intercepts gap to be formed, described first bell housing is arranged with the metal discharge collar striding across and intercept gap, the leading portion of the metal discharge collar and described secondary shielding overlap outer peripheral face parallel interval and arrange to form discharging gap.

2. high tension loop contact resistance live line measurement device according to claim 1, it is characterized in that: also comprise the first wireless communication module that setting is connected with voltage measuring apparatus in the housing, the terminal device being provided with the second wireless communication module, described voltage measuring apparatus realizes data by first, second wireless communication module and terminal device and transmits.

3. high tension loop contact resistance live line measurement device according to claim 2, it is characterized in that: described housing is provided with insulating bar, described secondary shielding puts the resigning hole offering and pass for insulating bar, and described first wireless communication module outwards transmits data by resigning hole.

4. the high tension loop contact resistance live line measurement device according to claim 1 or 2 or 3, is characterized in that: the described metal discharge collar forms in the hold-fast ring section of the first bell housing outer peripheral face, the electric discharge ring section of horizontal-extending and the abutment ring section be connected between hold-fast ring section and electric discharge ring section by holding tightly.

5. high tension loop contact resistance live line measurement device according to claim 4, is characterized in that: the front end edge of described electric discharge ring section stretches out.

6. high tension loop contact resistance live line measurement device according to claim 4, it is characterized in that: the described metal discharge collar is open type ring body, its opening part is connected by adjusting bolt, nut, by regulating the diameter of the adjustable described metal discharge collar of size of opening, described hold-fast ring section is locked by clamping screw and the first bell housing.

7. the high tension loop contact resistance live line measurement device according to claim 1 or 2 or 3, is characterized in that: described discharging gap equals the obstruct gap of 1/5-3/5.

8. the high tension loop contact resistance live line measurement device according to claim 1 or 2 or 3, is characterized in that: first, second wireless communication module described is bluetooth communication or WiFi communication module.

9. the high tension loop contact resistance live line measurement device according to claim 1 or 2 or 3, is characterized in that: in first, second bell housing described, at least one party is movably set on housing to regulate the size of described discharging gap.

10. the high tension loop contact resistance live line measurement device according to claim 1 or 2 or 3, is characterized in that: first, second bell housing described forms by around the collar of housing outer peripheral face and the shrouding of closed collar end face.