CN218546850U - High-voltage line voltage testing device - Google Patents

Abstract

The utility model discloses a high-voltage line voltage testing arrangement, the device include circuit high-voltage measurement electric capacity partial pressure main part, and alternating current-direct current voltage display appearance. The capacitive voltage division main body comprises a capacitive voltage divider, a base, a primary high-voltage cable and a secondary signal cable. The utility model discloses can measure overhead line response electricity and power cable terminal voltage under the condition that secondary voltage keeps apart once realizing, guarantee electric power operation personnel safety. The utility model discloses a high altitude wiring pincers connect at high-voltage line and get voltage signal and cause partial voltage, show voltage on alternating current-direct current voltage display through the secondary signal cable under partial voltage measurement. The line voltage value is tested through the high-voltage line voltage testing device, the safe distance is guaranteed when line phasing and line parameter testing are carried out on the high-voltage overhead line through the line voltage value, meanwhile, correct boosting operation is carried out at the head end through voltage testing of the tail end of a cable of the high-voltage overhead line, and good effect is obtained in practical application.

Description

High-voltage line voltage testing device

Technical Field

The utility model belongs to the technical field of electric power industry pressure measurement device, specific saying so relates to a high-voltage line voltage testing arrangement.

Background

In the power industry, when primary power transformation equipment is handed over, line parameter measurement and a power cable handover test of 7.8km of a certain 66kV power transmission line are carried out. The 66kV parallel-frame line with the same tower and the same tower in live-line operation is 12.6km, the field induction electricity is large, and electric workers cannot perform phasing work by measuring the insulation resistance. Meanwhile, the cable was subjected to an ac withstand voltage test in accordance with "transfer test standard for electrical equipment in electrical equipment installation engineering" (GB 50150-2016). The capacitance of each phase of the cable can be calculated by looking up a table, and the alternating current withstand voltage test of the cable has the following conditions: if the head end performs a test according to a rule, the voltage of the tail end is increased under the influence of a capacity-rise effect, the increment is unknown, and unrecoverable insulation damage can be caused to a tail end cable within 1 hour of withstand voltage time; if the head end reduces the test voltage, the cable insulation level cannot be tested due to insufficient withstand voltage, and the reduction value can only be estimated, so that the cable cannot be effectively tested.

A voltage divider is a passive linear circuit that provides an output voltage that is a fraction of its input voltage. The voltage division is a result of dividing the input voltage between the voltage divider components. A capacitive voltage divider is a voltage dividing circuit that uses a capacitance as a voltage dividing element to divide the voltage into its various parts based on the value of capacitors that are connected in series to form a voltage divider network with a voltage source.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome not enough that exists among the prior art, provide a device that can test high tension line voltage, the device can measure overhead line response electricity and power cable terminal voltage.

The utility model discloses a realize through following technical scheme: the utility model provides a high voltage transmission lines voltage testing arrangement, this high voltage transmission lines voltage testing arrangement includes circuit high-voltage measurement electric capacity partial pressure main part, circuit high-voltage measurement electric capacity partial pressure main part includes capacitive voltage divider, a pedestal, once high-voltage cable, secondary signal cable and alternating current-direct current voltage display appearance, the fixed capacitive voltage divider that is provided with on the pedestal, capacitive voltage divider's instrument ground connection, be provided with once high-voltage cable on capacitive voltage divider's top, once high-voltage cable can be connected with high-pressure overhead line through high altitude wiring pincers or ground wire pole, be provided with secondary signal terminal in capacitive voltage divider's lower part, be connected with the secondary signal cable on secondary signal terminal, the secondary signal cable is connected with alternating current-direct current voltage display appearance. An AC/DC switch is arranged on the AC/DC voltage display instrument, and the AC/DC voltage display instrument is grounded.

The primary high-voltage cable is connected with a voltage signal on a high-voltage line through a high-altitude wiring clamp or a ground wire rod, the alternating current/direct current voltage display instrument is connected with a secondary signal on the capacitance voltage division through a secondary signal cable and displays the voltage on the alternating current/direct current voltage display instrument, and all the instruments are provided with wiring.

In the absence of an electrostatic voltmeter, voltage detection is performed by using a capacitive voltage divider and a voltmeter in a series resonance instrument set. Under the condition that the tail end of the line is grounded, a test lead is connected to the top of the voltage divider, and the line is subjected to a phasing test in a mode of removing a grounding wire to measure an induced voltage. Connect the voltage divider to series resonance reactor outgoing line side, the feasibility of instrument air-lift verifying attachment, then connect to the cable end of being tried to cable end is held as the alignment rope and is carried out 1 hour withstand voltage test to this cable, has both guaranteed that test voltage does not reduce, can't effectively inspect the cable insulation condition, has avoided the volume to rise the effect again and has caused the cable end to bear too high voltage, causes the latent defect, the utility model provides a device of test high voltage transmission line voltage can obtain good effect in practical application.

The utility model has the advantages that: the utility model provides a can test device of high-tension line voltage, the device can measure overhead line response electricity and power cable terminal voltage under the condition that secondary voltage keeps apart once realizing, guarantees electric power operation personnel safety. The utility model discloses can test the device of high-voltage line voltage can realize exchanging high voltage measurement among the electric power system, monitor system voltage; the phasing test can be carried out on the power transmission line under the condition of large induced electricity; the method can be used for monitoring the voltage at the tail end of the long-distance high-voltage power cable, so that the condition that the voltage of the tail end test exceeds the specified value in the cable test due to the capacitance-rise effect is avoided.

The utility model provides a high voltage transmission lines voltage testing arrangement connects at high voltage transmission lines through high altitude wiring pincers and gets voltage signal and cause partial voltage, shows voltage on alternating current-direct current voltage display through the secondary signal cable under partial voltage measurement. Through the utility model provides a high-voltage line voltage testing arrangement test line voltage value guarantees safe distance when phasing and line parameter test high-voltage overhead line through line voltage value, carries out the exact operation that steps up at the head end through the terminal voltage test of high-voltage overhead line cable simultaneously. The utility model discloses a circuit high-voltage measurement electric capacity partial pressure main part, circuit high-voltage measurement electric capacity partial pressure main part includes capacitive voltage divider, base, a high-voltage cable, secondary signal cable and alternating current-direct current voltage display appearance, and a high-voltage cable connects through high altitude jointing clamp or wire pole at high-voltage line and gets voltage signal, and alternating current-direct current voltage display appearance connects through the secondary signal cable on capacitive voltage divider and gets secondary signal and show voltage on alternating current-direct current voltage display appearance, and all instruments all are equipped with the wiring.

Drawings

Fig. 1 is a schematic structural diagram of the high-voltage line voltage testing device of the present invention;

fig. 2 is a circuit diagram of the capacitor voltage divider in the high-voltage line voltage testing apparatus of the present invention;

fig. 3 is a working schematic diagram of the ac/dc voltage display device of the present invention;

in the figure: 1-a capacitive voltage divider; 2-a base; 3-primary high voltage cable; 4-a secondary signal cable; 5-alternating current and direct current voltage display instrument; 6-high altitude wiring clamp or ground wire pole; 7-high voltage overhead lines; 8-secondary signal terminals; 9-AC/DC switch.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the utility model discloses a high-voltage line voltage testing arrangement, this high-voltage line voltage testing arrangement includes circuit high-pressure measurement electric capacity partial pressure main part, circuit high-pressure measurement electric capacity partial pressure main part includes capacitive voltage divider 1, a pedestal 2, a high-voltage cable 3, secondary signal cable 4 and alternating current-direct current voltage display instrument 5, the fixed capacitive voltage divider 1 that is provided with on base 2, capacitive voltage divider 1's instrument ground connection, be provided with a high-voltage cable 3 on capacitive voltage divider 1's top, a high-voltage cable 3 can be connected with high-pressure overhead line 7 through high altitude wiring pincers or ground wire pole 6, be provided with secondary signal terminal 8 in capacitive voltage divider 1's lower part, be connected with secondary signal cable 4 on secondary signal terminal 8, secondary signal cable 4 is connected with alternating current-direct current voltage display instrument 5. The AC/DC voltage display instrument 5 is provided with an AC/DC switch 9, and the AC/DC voltage display instrument 5 is grounded. The primary high-voltage cable 3 is connected with a voltage signal on a high-voltage line through a high-altitude wiring clamp or a ground wire rod 6, the alternating current and direct current voltage display instrument 5 is connected with a secondary signal on capacitor voltage division through a secondary signal cable 4 and displays voltage on the alternating current and direct current voltage display instrument 5, and all instruments are provided with wiring. For the measurement of the voltage of a high-voltage line (more than 1 kilovolt), the handheld insulating glove is hung on a high-altitude wiring clamp to connect a high-voltage measuring line, and then a high-voltage signal is analyzed through a capacitive voltage divider.

The utility model provides an electric capacity bleeder circuit is shown in FIG. 2 for calculate the partial pressure rule of electric capacity. In the following voltage divider circuit, two capacitors are connected in series with a voltage source such as "Vs". The voltage source can then be split into two, one supply through the C1 capacitor and the other voltage through the C2 capacitor. In addition, VC1 in the circuit represents the voltage of the entire C1 capacitor, and VC2 is the voltage of the entire C2 capacitor. Thus, the combined capacitance can give:

1/Ceq=1/C1+1/C2；

Ceq=C1×C2/C1+1/C2；

the amount of charge provided by the source, Q = Ceq × Vs, is essentially:

Q=(C1×C2/C1+1/C2)×Vs；

since the voltage of the capacitor "C1" is Vc1, there are:

Vc1=Q1/C1；

Vc1=(C1×C2/C1+C2)×Vs/C1；

Vc1=Vs/(C1+C2)×C2；

the voltage of the "C2" capacitor is Vc2, i.e. there are:

Vc2=Q2/C2；

Vc2=(C1×C2/C1+C2)×Vs/C2；

Vc2=Vs/(C1+C2)×C1；

thus, a single voltage across the capacitor is a fraction of the opposing capacitance, multiplied by the entire capacitance and voltage. The voltage ratio can be determined as 1000 by designing C1 and C2, for example, the power cable test high voltage Vs is 100kV, and the Vc2 output voltage is 100V.

In order to guarantee the safety of electric power and protect the personal safety of the operators, the Vc2 voltage is finally transmitted to the AC/DC voltage display instrument 5 through a secondary signal line.

The AC/DC voltage display 5 is a high-precision instrument which can measure voltage, current and resistance, and the functions are realized by a conversion circuit part, the measurement of the current and the resistance is based on the measurement of the voltage, the converter converts the analog voltage quantity which continuously changes along with the time into digital quantity, then an electronic counter counts the digital quantity to obtain the measurement result, and a decoding display circuit displays the measurement result. The logic control circuit controls the coordination of the circuits and completes the whole measuring process in sequence under the action of the clock. As shown in fig. 3, fig. 3 is a working schematic diagram of the ac/dc voltage display instrument 5, and the ac/dc voltage display instrument 5 finally displays real-time voltage of a line on the LCD display through the ac/dc switch 9, so as to facilitate research and judgment by an operator. The utility model provides a device of test high tension line voltage can obtain good effect in practical application.

It should be finally noted that the above contents are only used to illustrate the technical solutions of the present invention, but not to limit the protection scope of the present invention, and the simple modification or equivalent replacement performed by the technical solutions of the present invention by those skilled in the art does not depart from the spirit and scope of the technical solutions of the present invention.

Claims (3)

1. The utility model provides a high-voltage line voltage testing arrangement which characterized in that: high-voltage line voltage testing arrangement includes circuit high-voltage measurement electric capacity partial pressure main part, circuit high-voltage measurement electric capacity partial pressure main part includes capacitive voltage divider, base, a high-voltage cable, secondary signal cable and alternating current-direct current voltage display appearance fixed being provided with on the base capacitive voltage divider, capacitive voltage divider's instrument ground the top of capacitive voltage divider is provided with a high-voltage cable, a high-voltage cable can be connected with high-voltage overhead line through high altitude wiring pincers or ground wire pole capacitive voltage divider's lower part is provided with the secondary signal terminal, is connected with on the secondary signal terminal the secondary signal cable, the secondary signal cable with alternating current-direct current voltage display appearance is connected.

2. A high voltage line voltage testing arrangement according to claim 1, wherein: and an alternating current and direct current switch is arranged on the alternating current and direct current voltage display instrument, and the alternating current and direct current voltage display instrument is grounded.

3. A high voltage line voltage testing device according to claim 1 or 2, characterized in that: the primary high-voltage cable is connected with a voltage signal on a high-voltage line through a high-altitude wiring clamp or a ground wire rod, the alternating current/direct current voltage display instrument is connected with a secondary signal on the capacitance voltage division through a secondary signal cable and displays the voltage on the alternating current/direct current voltage display instrument, and all the instruments are provided with wiring.

Images