The Virginia Senate today approved a measure designed to prevent another credit care "scandal" among its members and bowed to House delegates over the procedure to be used in selecting the state's interim attorney general.

Without debate or dissent, the Senate approved the resolution designed to keep its members from using their state-issued telephone credit cards to run up large long-distance telephone bills on personal business. The measure was prompted by the disclosure last fall that some senators had run up bills of more than $1,000 a month and had admitted that some of the calls concerned private business.

Today's resolution made no reference to those disclosures - called Virginia's credit card scandal by some legislators. The resolution said only that "it is quite possible some errors in biling may be made at many stages" and required that senators verify the accuracy of their monthly bill before it is paid.

Senators will have to pay for any personal calls that are "mischarged" to the state.

Under pressure to fill the vacant position of state attorney general, the Senate reluctantly agreed to the wishes of the 100-member House of Delegates and jointly elected Anthony F. Troy, the current chief deputy attorney general to the position.

Troy will serve until Jan. 14, 1978, when a new attorney general elected in November takes office.

Andrew P. Miller resigned the position Jan. 17 to seek the Democratic nomination for governor, and there was never any question that Troy would be named to succeed him.

But until this week Senate leaders insisted that the House and Senate hold separate elections over the vacancy rather than vote together, as they did today. Sen. Joseph V. Gartland Jr. (D-Fairfax) said today's Senate action amounted to "eating crow" and decried the procedure. However, no one in either the House or Senate cast a vote against Troy.

Two consumer-backed utility measures died in the Assembly today, one by a 20-to-19 vote on the Senate floor, and the other by a 16-to-2 vote in the House Committee on Corporations. Insurance and Banking. The House measure would have established a fund for a state consumer council by increasing monthly utility bills by a penny. The measure was opposed by utility lobbyrists. The bill killed on the Senate floor would have allowed landowners to have a person paid by utility companies watch surveying teams checking their property for major power lines.

Sponsors of the measure said it would prevent power company surveyors from destroying farm property and trees as they survey for major power facilities.

In other action, the House Roads and Internal Navigation Committee killed a bill that would have eliminated the state requirement that motorcyclists wear safety helmets. Critics of the bill argued that helmets were needed as safety devices, but leather-jacketed motorcyclists at the hearing claimed they obstructed a rider's vision and hearing and caused neck pains.

Another House Committee approved and sent to the House floor a sweeping annexation bill that would among other things, allow new towns such as Reston, to be incorporated. The measure was approved by a 14-to-15 vote and would end a state moraterium on the i corporation of municipalitics.